JP2001314281A - Sofa - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a convenient reclining sofa in which the inclination angle of a seat back part interlocked with a seat part can be changed only by moving the seat part forward and backward to be usable for receiving a user, or for relaxation. SOLUTION: This sofa comprises a seat part, and a seat back part provided to stand on the back of the seat part, and by moving the seat part forward and backward, height of the seat back part can be adjusted, while its inclination angle is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining sofa in which a backrest portion can be linked to a seating portion to change an inclination angle of the backrest portion only by moving a seating portion back and forth.

[0002]

2. Description of the Related Art Conventionally, a seating section is provided so as to be slidable back and forth so that the seating comfort of a sofa in which the length of the seating section can be adjusted and a sofa in which the inclination angle of a backrest can be adjusted can be adjusted. Various sofas are known, such as a comfortable sofa and a completely fixed sofa having no movable parts. In particular, in recent years, various sofas capable of adjusting the sitting condition in pursuit of usability have been developed. As a conventional sofa, for example,
Japanese Patent Laying-Open No. 10-225337 (hereinafter referred to as “A”) discloses that “when a seat separate from a sofa body is slid backward on a sofa body having a backrest, the rear portion is housed in the housing space, Sofa that can be pulled out from the accommodation space forward when sliding to
Is disclosed.

Hereinafter, a conventional sofa will be described with reference to the drawings. FIG. 6 is a perspective view of a main part of a conventional sofa. In FIG. 6, reference numeral 51 denotes a conventional sofa;
Is an upright sofa body, and has a backrest 53. Reference numeral 54 denotes a housing space recessed by opening the front and side below the backrest 53 of the sofa body 52, 55 denotes a seat portion whose rear portion is slidably housed in the housing space 54, and 56 denotes a front portion of the seat portion 55. The seat 55 is supported by the housing space 54 and the casters 56 at the front and rear portions, respectively. By moving the seat portion 55 forward, the rear portion of the seat portion 55 is pulled out of the housing space 54 while rolling the casters 56.

[0004]

However, the above-mentioned prior art has the following problems. (1) Since the tilt angle of the backrest 53 cannot be adjusted, the body cannot be rested sufficiently, and a feeling of relaxation cannot be obtained, resulting in poor usability. (2) Since the front portion of the seat portion 55 is supported only by the casters 56 and the rear portion is simply housed in the housing space 54, the seat portion 55
There is a high possibility that the rear part will come out of the accommodation space 54, and the safety is inferior.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The tilt angle of the backrest portion linked to the seating portion can be changed simply by moving the seating portion back and forth, and the seating portion can be used for sitting or relaxing. It is an object of the present invention to provide a reclining sofa with excellent convenience.

[0006]

In order to solve the above-mentioned conventional problems, a sofa according to the present invention has the following configuration. The sofa according to claim 1 of the present invention has a seating portion,
A sofa having a backrest erected behind the seat, comprising: a base frame serving as a base disposed below the seat; a lower base for fixing the base frame; and a backrest. A sofa frame having a back support portion for supporting the back, a vertical frame erected on the front end of the base frame, a sliding pin protruding from an upper portion of the vertical frame, and a lower end provided on the base frame. A first link member pivotally supported, a second link member fixed to the seat portion substantially horizontally with the base frame, and a rear end portion pivotally supported at an upper end side of the first link member; A sliding groove slidably held by the moving pin and formed a predetermined length from the front end of the second link member to the middle in the longitudinal direction;
The lower end is behind the first link member (backrest side)
A third link member pivotally supported by the base frame and having an upper end pivotally supported by a lower portion of the backrest;
The other end of the third link member is pivotally supported at the middle of the length of the link member.
A fourth link member pivotally supported in the middle of the length direction of the link member.

With this configuration, the following operation can be obtained. (1) By moving the seat portion rearward, the second link member is moved rearward while the sliding groove is supported by the sliding pin. The upper end of the first link member is moved (rotated) rearward by the second link member around the pivotal support with the base frame. The fourth link member has the front end portion moved rearward by the first link member and presses the third link member rearward at the rear end portion. The upper end of the third link member is moved (rotated) rearward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state. Therefore, the backrest can be linked to the seating part by a simple operation to change the state from the sleeping state to the raised state, so that it can be used for reception and is excellent in usability. (2) By moving the seat forward, the second link member is moved forward while the sliding groove is supported by the sliding pin. The upper end of the first link member is moved (rotated) forward by the second link member about the pivotal support portion with the base frame. The fourth link member has its front end moved forward by the first link member and pulls the third link member forward at its rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved forward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (4) By simply moving the seating part to the backrest side (rearward) or forward, the sofa can be put up or lying down, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience.

Here, as the sofa, one or a plurality of sofas are used. When the sofa is for a plurality of persons, it is preferable that each of the seats is formed so as to move independently. Thereby, the usability and convenience of the sofa can be further improved. As the shape of the fourth link member, a linear shape, a triangular shape, a quadrangular shape, or the like is used, and an L-shape disposed with the corner portion downward, a shape protruding downward, or the like is preferably used. When the seating portion moves downward, the seating portion does not hit the fourth link member, so that the fourth link member is unlikely to hinder the downward movement of the seating portion, and the fourth link member does not take up a place. That's why. The sofa frame is made of metal, synthetic resin such as FRP, a wooden frame, or the like. As the upper end side of the first link member on which the second link member is pivotally supported, the upper end portion of the first link member or the upper half of the first link member in the longitudinal direction is indicated. The lower part of the backrest on which the third link member is pivotally supported refers to the lower surface of the backrest or the lower part of both sides of the backrest. As the slide pin, one having a circular cross section that is engaged with the groove of the slide groove, is slidable in the groove, and can rotate the slide groove around the slide pin is used. In particular, when a rotatable roller supported by a vertical frame is used as the sliding pin, the sliding can be performed smoothly.

According to a second aspect of the present invention, there is provided the sofa according to the first aspect, wherein the first link member is arranged to be inclined forward, and the third link member is inclined to the rear. It has a configuration that is arranged.

With this configuration, in addition to the function of claim 1,
The following effects are obtained. (1) Since the first link member is moved rearward and upward (rotated) when the seating portion is moved rearward, the second link member and thus the seating portion are moved rearward while the rear portion is raised. Can be On the other hand, the upper end of the third link member is moved rearward and downward (rotated), so that the backrest is moved rearward while the lower part is lowered. Therefore, the backrest portion is in a state in which the lower portion has entered the rear of the seating portion and is raised, so that the height of the backrest portion can be made lower than in the lying state, and the usability is excellent. (2) Since the first link member is moved forward (downward) when moving the seat portion forward, the second link member and thus the seat portion are moved forward while the rear portion is lowered. Can be On the other hand, since the upper end of the third link member is moved forward (turned) upward, the backrest is moved forward while the lower portion is raised.
Accordingly, the backrest portion is in a state where the lower portion of the backrest portion comes out upward from the rear of the seating portion and lies down, so that the length of the backrest portion can be made longer than in the raised state, and the usability is excellent.

According to a third aspect of the present invention, there is provided a sofa, a seating portion, a backrest standing upright behind the seating portion,
A sofa frame having a base frame as a base disposed below the seating portion, a lower base for fixing the base frame, and a back support portion for supporting a back surface of the backrest portion, A first link member having a lower end pivotally supported by the base frame; and a second link fixed to the seating portion substantially horizontally with the base frame and having a rear end pivotally supported by an upper end of the first link member. A third link member having a lower end pivotally supported by the base frame behind (the backrest side of) the first link member and an upper end pivotally supported by a lower portion of the backrest; A fourth link member pivotally supported at a middle position in the longitudinal direction of the link member and the other end pivotally supported at a middle position in the longitudinal direction of the third link member; and a lower end portion located forward of the first link member. Supported on the base frame A fifth link member, the portion of which is pivotally supported by a predetermined portion on the front end side of the second link member and whose arrangement angle with respect to the base frame is substantially the same as that of the first link member. ing.

With this configuration, the following operation can be obtained. (1) The second link member is moved rearward while being pivotally supported by the upper ends of the first link member and the fifth link member by moving the seating portion rearward (backrest side). The upper end of the first link member is moved (rotated) rearward about the pivotal support portion with the base frame by the movement of the second link member. The fourth link member has its front end moved rearward by the rotation of the first link member, and presses the third link member rearward at the rear end. The upper end of the third link member is moved (rotated) rearward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state. Therefore, the backrest can be linked to the seating part by a simple operation to change the state from the sleeping state to the raised state, so that it can be used for reception and is excellent in usability. (2) By moving the seat portion forward, the second link member is moved forward while being pivotally supported by the upper end portions of the first link member and the fifth link member. The upper end portion of the first link member is moved (rotated) forward around the shaft supporting portion with the base frame by the movement of the second link member.
The front end of the fourth link member is moved forward by the rotation of the first link member, and the fourth link member pulls the third link member forward at the rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved forward by the third link member while the upper portion of the back surface is supported by the back support portion, so that the backrest portion is in a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the arrangement angles of the first link member and the fifth link member with respect to the base frame are substantially the same, the angle of the second link member (seating portion) with respect to the base frame in the lying state and in the raised state is different. Identical and excellent in usability. (4) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (5) By simply moving the seating portion to the backrest side (rearward) or forward, the sofa can be placed in a raised or lying state, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience.

Here, as the sofa, one or more persons can be used. When the sofa is for a plurality of persons, it is preferable that each of the seats is formed so as to move independently. Thereby, the usability and convenience of the sofa can be further improved. As the shape of the fourth link member, a linear shape, a triangular shape, a quadrangular shape, or the like is used, and an L-shape disposed with the corner portion downward, a shape protruding downward, or the like is preferably used. When the seating portion moves downward, the seating portion does not hit the fourth link member, so that the fourth link member is unlikely to hinder the downward movement of the seating portion, and the fourth link member does not take up a place. That's why. The sofa frame is made of metal, synthetic resin such as FRP, a wooden frame, or the like. As the upper end side of the first link member on which the second link member is pivotally supported, the upper end portion of the first link member or the upper half of the first link member in the longitudinal direction is indicated. The lower part of the backrest on which the third link member is pivotally supported refers to the lower surface of the backrest or the lower part of both sides.

According to a fourth aspect of the present invention, there is provided a sofa, a seating portion, a backrest provided upright behind the seating portion,
A sofa frame having a base frame as a base disposed below the seating portion, a lower base for fixing the base frame, and a back support portion for supporting a back surface of the backrest portion, Two or more first support members having lower ends fixed to the front end side of the base frame, sliding pins formed at the upper end of the first support member, and the seating portion substantially horizontally with the base frame. A fixed second link member, a sliding groove formed to have a predetermined length from the front end side of the second link member to the middle in the longitudinal direction and slidably held by the sliding pin; A third link member pivotally supported at the rear end side of the base frame and an upper end pivotally supported at a lower portion of the backrest;
A fourth link member pivotally supported at the rear end side (backrest side) of the link member and the other end pivotally supported at an intermediate position in the longitudinal direction of the third link member. ing.

With this configuration, the following operation can be obtained. (1) By moving the seat portion rearward, the second link member is moved rearward while the sliding groove is supported by the sliding pin of the first support member. The front end of the fourth link member is moved rearward by the movement of the second link member, and the fourth link member presses the third link member rearward at the rear end. Third
The upper end of the link member is moved (rotated) rearward about a pivot portion with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state. Therefore, the backrest can be linked to the seating part by a simple operation to change the state from the sleeping state to the raised state, so that it can be used for reception and is excellent in usability. (2) By moving the seat portion forward, the second link member is moved forward while the sliding groove is supported by the sliding pin of the first support member. The front end of the fourth link member is moved forward by the movement of the second link member, and the fourth link member pulls the third link member forward at the rear end. Third
The upper end of the link member is moved (rotated) forward around a shaft support with the base frame. The lower portion of the backrest portion is moved forward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (4) By simply moving the seating part to the backrest side (rearward) or forward, the sofa can be put up or lying down, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience. (5) Since two or more first support members are provided, the second link member does not rotate and the backrest side of the seating portion can be prevented from sinking downward (toward the base frame), and the stability of the seating portion is excellent. . (6) When the seat is moved forward or backward to bring the sofa to a lying state or a standing state, it is possible to prevent the seat from moving up and down, thereby improving the sitting comfort of the seat.

Here, as the sofa, one or more persons can be used. When the sofa is for a plurality of persons, it is preferable that each of the seats is formed so as to move independently. Thereby, the usability and convenience of the sofa can be further improved. As the shape of the fourth link member, a linear shape, a triangular shape, a quadrangular shape, or the like is used, and an L-shape disposed with the corner portion downward, a shape protruding downward, or the like is preferably used. When the seating portion moves downward, the seating portion does not hit the fourth link member, so that the fourth link member is unlikely to hinder the downward movement of the seating portion, and the fourth link member does not take up a place. That's why. The sofa frame is made of metal, synthetic resin such as FRP, a wooden frame, or the like. The lower part of the backrest on which the third link member is pivotally supported refers to the lower surface of the backrest or the lower part of both sides of the backrest. The lower end of the first support member may be fixed to the base frame, and may be formed integrally with the base frame. The sliding pin of the first support member may be any one that is engaged with the groove of the sliding groove and is slidable with the groove. In particular, when a rotatable roller body pivotally supported by the first support member is used as the sliding pin, the sliding can be performed smoothly.

According to a fifth aspect of the present invention, there is provided a sofa, comprising: a seating portion; a backrest standing upright behind the seating portion;
A sofa frame having a base frame as a base disposed below the seating portion, a lower base for fixing the base frame, and a back support portion for supporting a back surface of the backrest portion, A first support member having a lower end fixed to the base frame; a sliding pin formed at an upper end of the first support member; and a second link member fixed to the seating portion substantially horizontally with the base frame. A sliding groove formed at a predetermined length from the middle in the longitudinal direction of the second link member to the rear end side and slidably held by the sliding pin; A third link member pivotally supported by the base frame further rearward (backrest side) and an upper end pivotally supported by a lower portion of the backrest portion; and a second link member having one end rearward of the first support member. Pivoted at the rear end A fourth link member having an end pivotally supported in the middle of the length direction of the third link member, a lower end pivotally supported by the base frame in front of the first support member, and an upper end having the second link A fifth link member pivotally supported by a predetermined portion on the front end side of the member.

With this configuration, the following operation can be obtained. (1) The second link member is moved rearward while the sliding groove is supported by the sliding pin of the first support member by moving the seating portion rearward (backrest side). The upper end of the fifth link member is moved (rotated) rearward around the pivotal support portion with the base frame by the movement of the second link member. The front end of the fourth link member is moved rearward by the movement of the second link member, and the fourth link member presses the third link member rearward at the rear end. The upper end of the third link member is moved (rotated) rearward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state. Therefore, the backrest can be linked to the seating part by a simple operation to change the state from the sleeping state to the raised state, so that it can be used for reception and is excellent in usability. (2) By moving the seat portion forward, the second link member is moved forward while the sliding groove is supported by the sliding pin of the first support member. The upper end portion of the fifth link member is moved (rotated) forward around the shaft supporting portion with the base frame by the movement of the second link member. The front end of the fourth link member is moved forward by the movement of the second link member, and the fourth link member pulls the third link member forward at the rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame.
The lower portion of the backrest portion is moved forward by the third link member while the upper portion of the back surface is supported by the back support portion, so that the backrest portion is in a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (4) By simply moving the seating part to the backrest side (rearward) or forward, the sofa can be put up or lying down, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience.

Here, as the sofa, one or more persons can be used. When the sofa is for a plurality of persons, it is preferable that each of the seats is formed so as to move independently. Thereby, the usability and convenience of the sofa can be further improved. As the shape of the fourth link member, a linear shape, a triangular shape, a quadrangular shape, or the like is used, and an L-shape disposed with the corner portion downward, a shape protruding downward, or the like is preferably used. When the seating portion moves downward, the seating portion does not hit the fourth link member, so that the fourth link member is unlikely to hinder the downward movement of the seating portion, and the fourth link member does not take up a place. That's why. The sofa frame is made of metal, synthetic resin such as FRP, a wooden frame, or the like. The lower part of the backrest on which the third link member is pivotally supported refers to the lower surface of the backrest or the lower part of both sides. As the slide pin of the first support member, a slide pin having a circular cross section that is engaged with the groove of the slide groove, is slidable with the groove, and can rotate the slide groove around the slide pin is used. In particular, when a rotatable roller body pivotally supported by the first support member is used as the sliding pin, the sliding can be performed smoothly.

The invention according to claim 6 of the present invention is the sofa according to any one of claims 1 to 5, wherein one end of the sofa is the vertical frame, the base frame, or the first frame.
It has a configuration in which an elastic body fixed to a support member and the other end is fixed to the first link member, the third link member, or the fourth link member.

With this configuration, the following operation is obtained in addition to the operation of any one of the first to fifth aspects. (1) First link member, third link member, or fourth link member
Since the link member is connected to the vertical frame, the base frame, or the first support member by an elastic body, it is necessary to move the upper end of the first link member, the third link member, or the fourth link member backward to a certain extent. Force is required. As a result, even when a load such as a human body is applied to the backrest when the backrest is lying down, the backrest is not raised and the usability is excellent. (2) Since the elastic body absorbs the impact on the backrest, the burden on the human body is small and the usability is excellent. Here, a spring, a rubber body, or the like is used as the elastic body.

According to a seventh aspect of the present invention, there is provided the sofa according to any one of the first to sixth aspects, wherein the first link member or the fourth link member has a lengthwise direction. It has a structure provided with a contact portion which is provided at a middle position and which comes into contact with the upper surface of the base frame to prevent the first link member or the fourth link member from being excessively inclined.

According to this configuration, the following operation is obtained in addition to the operation of any one of the first to sixth aspects. (1) When the first link member or the fourth link member is at a predetermined inclination angle, the contact portion contacts the upper surface of the base frame, so that the first link member or the fourth link member is excessively inclined. This prevents the seating portion from moving too downward (toward the base frame), and is excellent in usability and safety. Here, a rod-shaped body, a protrusion, or the like is used as the contact portion.

[0024] The invention according to claim 8 of the present invention is the sofa according to any one of claims 1 to 7, wherein a lower end portion is located forward and / or rearward of the third link member. It has a configuration in which an auxiliary link member is supported by a base frame and an upper end portion is supported by a lower portion of the backrest portion, and an arrangement angle with respect to the base frame is substantially the same as that of the third link member. .

With this configuration, the following operation is obtained in addition to the operation of any one of the first to seventh aspects. (1) Since the backrest is supported by the auxiliary link member in addition to the third link member, it is possible to prevent the backrest from easily rotating around the third link member when the sofa is used, thereby preventing the backrest from shaking. Thus, the stability of the backrest can be improved, and the backrest can be reliably supported, so that the safety can be improved.

Here, one or a plurality of auxiliary link members are provided forward and / or rearward of the third link member. When a plurality of auxiliary link members are provided, the backrest can be firmly supported and safety can be improved.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A sofa according to a first embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a perspective view of a sofa according to Embodiment 1 of the present invention, and FIG. 2 (A) is a view of FIG. −
FIG. 2B is a cross-sectional view taken along line A of FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB of FIG. 1 showing a state in which the backrest portion has occurred in Embodiment 1 of the present invention. 1 and 2
1 is a sofa according to the first embodiment of the present invention, and 2 is a metal or composite having a lower base 2a for fixing a base frame described later and a back support 2b for supporting an upper portion of the back of a backrest from above the middle of the back. A sofa frame made of resin or the like, 2 'is an armrest disposed on both sides of the sofa frame 2, and 3 is a back portion to be described later and a back portion to be described later (hereinafter, the back portion 3 side is shown as a rear side). It is a sofa body having a configuration, and two sofa bodies are provided in a sofa frame 2 side by side. Reference numeral 4 denotes a base frame which is a base of the sofa main body 3 disposed below the sofa main body 3, and is fixed to the lower base 2a by bolts or the like. Reference numeral 5 denotes a vertical frame erected on the front end of the base frame 4, and reference numeral 5a denotes a sliding pin protruding from an upper side surface of the vertical frame 5, the tip of which is formed to have a large diameter. It slides while being locked in the sliding groove. 6 is the base frame 4 on the lower side
Is a first link member pivotally supported in the middle of the lengthwise side surface, and is disposed with its upper end inclined forward. 7
Is a second link member disposed substantially horizontally with the base frame 4, and the rear end is pivotally supported by the upper end of the first link member 6. Reference numeral 7a denotes a sliding groove formed from the front end of the side wall in the longitudinal direction of the second link member 7 to the middle thereof, and slidably supports the sliding pin 5a back and forth. Reference numeral 8 denotes a third link member whose lower side surface is pivotally supported on the longitudinal side surface of the base frame 4 behind the first link member 6, and is located rearward when the seating portion is stored (when the backrest portion is raised). It is arranged in an inclined state. Reference numeral 9 denotes an L-shaped fourth link member formed such that the short member 9a and the long member 9b are perpendicular to each other, and the upper end of the short member 9a is located in the middle of the first link member 6 in the longitudinal direction. And the upper end of the long member 9b is supported in the middle of the third link member 8 in the longitudinal direction. 9c is the fourth
Base frame 4 at the lower end of short member 9a of link member 9
The contact portion protrudes from the side surface of the base member 4 and contacts the upper surface of the base frame 4 to prevent the short member 9a from being inclined forward too much. 10 is a vertical frame at one end
And the other end is an elastic body such as a spring fixed at the middle in the length direction of the short member 9a of the fourth link member 9. Reference numeral 11 denotes a seat having a lower portion integrally fixed to the second link member 7; 11a, a rear side wall of the seat 11;
Is a backrest portion in which the upper portion of the back surface is in contact with the upper portion of the back support portion 2b and the rear portion of the lower end portion 12a is pivotally supported by the upper end portion of the third link member 8.

With regard to the sofa having the above-described configuration according to the first embodiment, the case where the backrest portion is brought up from the sleeping state and the case where the backrest portion is brought up from the sleeping state will be described below with reference to the drawings. I will explain while. (1) When the backrest is changed from a lying state to a raised state. In FIG. 2A, first, the seat 11 is moved rearward (pressed). Accordingly, the second link member 7 moves rearward while the sliding groove 7a is supported by the sliding pin 5a (arrow C). The rear end of the second link member 7
The first link member 6 moves rearward while being lifted upward about the slide pin 5a (arrow D). Along with this, the seating portion 11 also moves rearward while the rear end portion is lifted (arrow E). Since the first link member 6 pivots rearward about the pivot with the base frame 4,
With the rotation of the first link member 6, the fourth link member 9
Of the first link member 6 is moved rearward (arrow F). Accordingly, the fourth link member 9 also moves rearward while urging the elastic body 10. Further, the pivot portion of the fourth link member 9 with the third link member 8 is also moved rearward (arrow G), and the third link member 8 is moved to the base frame 4.
The pivot portion of the third link member 8 and the backrest 12 is also moved downward (toward the base frame 4) and backward (arrows). H). The back portion of the backrest 12 is moved downward and backward by the third link member 8 while the back surface is supported by the back support portion 2b (arrow H). It enters while abutting on the side wall 11a (arrow I), and is in a state of rising while gradually descending (see FIG. 2B). At this time, the fourth link member 9 is in a state of being urged forward by the elastic body 10, but the lower portion of the front surface of the backrest 12 is the seating portion 1.
1 is locked to the lower portion of the rear side wall, so that the seating portion 11
Does not move forward.

(2) A case where the backrest is changed from a raised state to a lying state. In FIG. 2B, first, the seat 11 is moved forward (pulled out). Accordingly, the second link member 7 moves forward while the sliding groove 7a is supported by the sliding pin 5a (arrow J). Also, the rear end of the second link member 7 pulls the upper end of the first link member 6 forward,
The upper end of the link member 6 is moved (rotated) downward and forward about the pivotal support portion of the first link member 6 with the base frame 4 (arrow K). Along with this, the seating portion 11 also moves forward while being pulled downward (at the side of the base frame 4) at the rear end (arrow L). Here, since the fourth link 9 to which the elastic body 10 is fixed is pivotally supported by the first link 6, the first link member 6 is moved by the restoring force of the elastic body 10.
It is rotated forward (arrow K) about the shaft support with the base frame 4. Along with this, the fourth link member 9 is also moved forward by the restoring force of the elastic body 10 so that the shaft supporting portion of the fourth link member 9 with the first link member 6 is moved forward (arrow M).
At the same time, the fourth link member 9 moves forward. In addition, the pivot portion of the fourth link member 9 with the third link member 8 is also moved forward (arrow N), and the third link member 8 rotates around the pivot portion with the base frame 4 to move forward. Then, the pivot portion of the third link member 8 and the backrest portion 12 is also moved upward and forward (arrow O). The back portion of the backrest 12 is moved upward and forward by the third link member 8 while the upper portion of the back surface is supported by the back support portion 2b (arrow O), so that the lower portion of the front surface is the seating portion 11. It comes out upward (arrow P) while being in contact with the rear side wall 11a, and becomes a state of lying down while gradually ascending (see FIG. 2A).

Since the sofa according to the first embodiment of the present invention is configured as described above, it has the following operation. (1) Just by pushing the seating portion 11 backward, the seating portion 11
The rear part moves rearward and upward, and the lower part of the backrest part 12 moves rearward and downward by the link mechanism, so that the sofa 1 can be easily raised and excellent in usability. (2) Just pulling the seat 11 forward, the seat 11
The rear part moves forward and downward, and accordingly, the lower part of the backrest 12 moves forward and upward by the link mechanism. Therefore, it is easy to put the sofa 1 in a lying state, and the usability is excellent. (3) The contact portion 9c abuts on the upper surface of the base frame 4, thereby preventing the seat portion 11 from moving too downward. (4) The fourth link member 9 is connected to the elastic body 10, but in order to rotate the upper end portion of the third link member 8 backward, a force enough to extend the elastic body 10 is required. ,
Even when a load such as a human body is applied to the backrest portion 12 when the backrest portion 12 is lying down, the backrest portion 12 is not raised and is excellent in usability. (5) When the sofa 1 is raised, the fourth link member 9 is urged forward by the elastic body 10, but the lower portion of the front surface of the backrest 12 is located at the rear side wall 11 a of the seating portion 11.
Since the seat 11 is locked to the lower part of the sofa 1, the seating portion 11 does not easily move forward, so that the stability when the sofa 1 is raised and the safety are excellent. (6) Since the elastic body 10 absorbs the impact to the backrest 12, the burden on the human body is small and the usability is excellent. (7) Since the fourth link member 9 is formed in an L-shape, it does not hinder the downward movement of the seating portion 11 and the backrest portion 12 and is excellent in usability. (8) Since the first link member 6 is disposed to incline forward and the third link member 8 is disposed to incline rearward, when the seating portion is moved rearward, the The lower part of the backrest 12 can be moved rearward while lowering the lower part of the backrest 12 while the lower part of the backrest 12 can be moved rearward while lowering the lower part of the backrest 12. It can be inserted into the rear of the seating portion 11 and the height of the backrest portion can be made lower than that in the lying state, so that the usability is excellent. (9) Since the first link member 6 is disposed to be inclined forward and the third link member 8 is disposed to be inclined rearward, when the seat portion is moved forward, The lower part of the backrest 12 can be moved forward while the lower part of the backrest part 12 can be moved forward while lowering the back part. As a result, when the sofa 1 is in the lying state, the lower part of the backrest part 12 can be moved forward. The seat back 11 can be pulled upward from the rear, and the length of the backrest can be made longer than in the raised state, which is excellent in usability.

(Embodiment 2) A perspective view of a sofa according to Embodiment 2 of the present invention is similar to that of Embodiment 1, and will be described with reference to FIG. FIG. 3A is a cross-sectional view taken along line AA of FIG. 1 showing a state in which the backrest portion is lying down according to the second embodiment of the present invention, and FIG. 3B is a second embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line BB of FIG. 1 showing a state in which the backrest portion is raised. FIG.
, 2 is a sofa frame, 2a is a lower base, 2b is a back support, 2 'is an armrest, 3 is a sofa body, 4 is a base frame, 6 is a first link member, 7 is a second link member, and 8 is a second link member. A 3 link member, 9 is a fourth link member, 9a is a short member, 9b is a long member, 11 is a seating portion, 11a is a rear side wall, 12 is a backrest portion, and 12a is a lower end portion. Therefore, the same reference numerals are given and the description is omitted. 21 is a sofa in Embodiment 2 of the present invention, and 22 is a first link member 6 at the lower end.
The fifth link member is pivotally supported by the front base frame 4 and the upper end portion is pivotally supported by a predetermined portion on the front end side of the second link member 7. The angles of the first link member 6 and the fifth link member 22 with respect to the base frame 4 are substantially the same. 23 has one end fixed to the base frame 4 and the other end connected to the first link member 6.
An elastic body such as a spring fixed to the fourth link member 9
The contact portion protrudes forward of the short member 9a.

With regard to the sofa having the above-described configuration in the second embodiment, the case where the backrest is changed from the lying state to the raised state and the case where the backrest is changed from the raised state to the sleeping state will be described below with reference to the drawings. I will explain while. (1) When the backrest is changed from a lying state to a raised state. In FIG. 3A, first, the seating portion 11 is connected to the backrest 1.
Move to the 2nd side (rear) (push in). This allows
The second link member 7 moves while being lifted backward by the rotation of the first link member 6 in the direction of arrow d and the rotation of the fifth link member 22 in the direction of arrow e (arrow c).
At this time, the first link member 6 moves while extending the elastic body 23. Further, since the fifth link member 22 and the first link member 6 are disposed at substantially the same angle with respect to the base frame 4, the second link member 7 and the seating portion 11 are fixed at a fixed angle with respect to the base frame 4. Keep moving. Since the first link member 6 pivots rearward about the pivot portion with the base frame 4, the pivot portion of the fourth link member 9 with the first link member 6 is moved rearward (arrow f). Along with this, the pivot portion of the fourth link member 9 with the third link member 8 is also moved rearward (arrow g), and the third link member 8 largely turns rearward around the pivot portion with the base frame 4. Then, the pivot portion of the third link member 8 and the backrest 12 is moved downward (toward the base frame 4) and backward (arrow h). Backrest 12
While the back is supported by the upper end of the back support 2b,
The rear portion of the lower end portion 12a is moved downward and rearward by the third link member 8 (arrow h), so that the lower portion of the front surface enters while contacting the rear side wall 11a of the seating portion 11 (arrow i), and gradually descends. Waking up (Fig. 3
(See (b)). At this time, the first link member 6 is urged forward by the elastic body 23, but the lower part of the front surface of the backrest part 12 is located on the rear side wall 11 of the seating part 11.
Since the seat 11 is locked at the lower part of the seat a, the seat 11 does not move forward.

(2) A case where the backrest is changed from a raised state to a lying state. In FIG. 3B, first, the seat 11 is moved forward (pulled out). Accordingly, the second link member 7 moves forward (arrow j) while being lowered obliquely downward by the movement of the first link member 6 (arrow k) and the movement of the fifth link member 22 (arrow l). ). At this time, the first link member 6 moves while being pulled forward by the restoring force of the elastic body 23. Further, since the fifth link member 22 and the first link member 6 are disposed at substantially the same angle with respect to the base frame 4, the second link member 7 and the seating portion 11 are fixed at a fixed angle with respect to the base frame 4. Keep moving.
Since the first link member 6 rotates forward about the pivot portion with the base frame 4, the pivot portion of the fourth link member 9 with the first link member 6 is moved forward (arrow m). Along with this, the pivot portion of the fourth link member 9 with the third link member 8 is also moved forward (arrow n), and the third link member 8 is raised forward around the pivot portion with the base frame 4. Accordingly, the pivotal support between the third link member 8 and the backrest 12 is also moved upward and forward (arrows o,
p). The backrest part 12 has a rear upper part which is a rear support part 2b.
The rear part of the lower end part 12a is moved upward and forward by the third link member 8 while being supported by the upper part (arrow o), so that the lower part of the front surface is the rear side wall 11a of the seating part 11.
It comes out upward (arrow p) while abutting on the base frame 4 while gradually rising and lying down.
(See FIG. 3 (a)).

Since the sofa according to the second embodiment of the present invention is configured as described above, it has the following operation. (1) Just by pushing the seating portion 11 backward, the seating portion 11
Since the rear part moves rearward and upward, and the lower part of the backrest part 12 moves rearward and downward by the link mechanism, the sofa 21 can be easily raised and the usability is excellent. (2) Just pulling the seat 11 forward, the seat 11
The rear part moves forward and downward, and the lower part of the backrest 12 moves forward and upward by the link mechanism, so that the sofa 21 can be easily put into a lying state,
Excellent usability. (3) Since the angle of the second link member 7 with respect to the base frame 4 is substantially the same between the raised state and the lying state, the seating portion 11
Is always constant and excellent in usability. (4) Since the second link member 7 moves in conjunction with the first link member 6 and the fifth link member 22, the mutual conversion between the raised state and the lying state can be performed smoothly, and the usability is improved. Excellent. (5) The contact portion 24 abuts on the upper surface of the base frame 4, so that the seat portion 11 can be prevented from moving too downward. (6) The first link member 6 is connected to the elastic body 23, but in order to rotate the upper end of the third link member 8 backward, a force sufficient to extend the elastic body 23 is required. ,
Even when a load such as a human body is applied to the backrest portion 12 when the backrest portion 12 is lying down, the backrest portion 12 is not raised and is excellent in usability. (7) When the sofa 21 is raised, the first link member 6 is urged forward by the elastic body 23, but the lower portion of the front surface of the backrest 12 is located on the rear side wall 11 of the seating portion 11.
Since the seat 11 is locked at the lower part of the seat 21, the seating portion 11 does not easily move forward, so that the stability when the sofa 21 is raised is excellent and the safety is excellent. (8) Since the elastic body 23 absorbs the impact to the backrest 12, the burden on the human body is small and the usability is excellent. (9) Since the fourth link member 9 is formed in an L-shape, it does not hinder the downward movement of the seating portion 11 and the backrest portion 12 and is excellent in usability.

(Embodiment 3) A perspective view of a sofa according to Embodiment 3 of the present invention is the same as that of Embodiment 1, and will be described with reference to FIG. FIG. 4A is a cross-sectional view taken along line AA of FIG. 1 showing a state in which the backrest portion is lying down according to the third embodiment of the present invention, and FIG. 4B is a third embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line BB of FIG. 1 showing a state in which the backrest portion is raised. FIG.
, 2 is a sofa frame, 2a is a lower base, 2b is a back support, 2 'is an armrest, 3 is a sofa body, 4 is a base frame, 7 is a second link member, 8 is a third link member, and 9a is a short length. Member, 9b is a long member, 11 is a seating portion,
Reference numeral 11a denotes a rear side wall, 12 denotes a backrest portion, and 12a denotes a lower end portion. These are the same as those in the first or second embodiment. 31 is a sofa in Embodiment 3 of the present invention, 7b is a sliding groove formed a predetermined length from the front end side of the side wall of the second link member 7 to the middle in the length direction, and 9 'is one end of the second link member 7 having the second end. A fourth link member 32a, 3 pivotally supported on the rear end side of the link member 7 and the other end pivotally supported in the middle of the length direction of the third link member 8;
2b is a first support member having a lower end fixed to the front end side of the base frame 4, and 33a, 33b are first support members 32a,
A sliding pin 34 formed at the upper end of 32b and slidably engaged with the sliding groove 7b has a lower end pivotally supported by the base frame 4 behind the third link member 8 and an upper end at the backrest 1.
An auxiliary link member 35 pivotally supported by the lower end 12a of the second member 35 is an elastic body such as a spring having one end fixed to the first support member 32b and the other end fixed to the short member 9a of the fourth link member 9 '. . The first support members 32a and 32b are disposed in parallel at the same height.
It is erected almost at a right angle. The auxiliary link member 34
The angle of the third link member 8 with respect to the base frame 4 is substantially the same. Here, the seating portion 11 of the sofa 31 is
As shown in FIG. 1, each seat 11 is formed so as to be movable. Thereby, each seat 11
Can be arbitrarily adjusted to a state where the backrest portion 12 is in a lying state or a standing state, and the usability and convenience of the sofa 31 can be improved.

Regarding the sofa configured as described above according to the third embodiment, the case where the backrest is changed from the lying state to the raised state and the case where the backrest is changed from the raised state to the sleeping state will be described below with reference to the drawings. I will explain while. (1) When the backrest is changed from a lying state to a raised state. In FIG. 4A, first, the seat 11 is moved rearward (to the side of the backrest 12) (pushed in). Accordingly, the second link member 7 has the sliding groove 7b
a, while being supported by 33b, move backward (arrow C '), and the seat 11 also moves backward (arrow E'). With the movement of the second link member 7, the pivotal support portion of the fourth link member 9 'with the second link member 7 becomes elastic 35
To move backward (arrow F '). Further, the pivot of the fourth link member 9 ′ with the third link member 8 is also rotated rearward (arrow G ′), and the third link member 8 becomes large rearward around the pivot with the base frame 4. The pivot portion is rotated and inclined, and the pivot portion of the third link member 8 and the backrest portion 12 is also pivoted downward (toward the base frame 4) and backward (arrow H '). Here, with the rotation of the third link member 8, the auxiliary link member 34 is largely rotated backward and inclined about the shaft supporting portion with the base frame 4, similarly to the third link member 8, and is inclined. The pivot portion between the auxiliary link member 34 and the backrest 12 is also rotated downward and rearward (arrow H ''). The back portion of the backrest 12 is moved downward and rearward by the third link member 8 and the auxiliary link member 34 while the back surface is supported by the back support portion 2b (arrows H 'and H "). The lower portion of the front surface of the backrest 12 enters the rear side wall 11a of the seating portion 11 while abutting (arrow I '), and gradually rises while descending (see FIG. 4B). At this time, the fourth link member 9 ′ is urged forward by the elastic body 35, but the lower part of the front surface of the backrest 12 is the seating part 1.
Since the seat 11 is locked to the lower portion of the rear side wall 11a, the seat 11 does not move forward.

(2) A case where the backrest portion is changed from a raised state to a lying state. In FIG. 4B, first, the seat 11 is moved forward (pulled out). Accordingly, the second link member 7 moves forward (arrow J ') while the sliding groove 7b is supported by the sliding pins 33a, 33b, and also moves the seat portion 11 forward (arrow L). '). With the movement of the second link member 7, the pivotal support portion of the fourth link member 9 'with the second link member 7 moves forward due to the restoring force of the elastic body 35 (arrow M'). Further, the pivot portion of the fourth link member 9 'with the third link member 8 is also moved forward (arrow N'),
The third link member 8 is pivoted about the pivot with the base frame 4 to be raised forward, and the pivot between the third link member 8 and the backrest 12 is also pivoted upward and forward (arrow O). '). Here, as the third link member 8 rotates, the auxiliary link member 34
The auxiliary link member 34 and the backrest portion 12 are tilted by being largely rotated forward and tilted about a shaft support portion with the base frame 4.
Is also pivoted upward and forward (arrow O ''). The back portion of the backrest portion 12 is moved upward and forward by the third link member 8 and the auxiliary link member 34 while the upper portion of the back surface is supported by the back support portion 2b (arrows O 'and O''). 4), the lower part of the front surface comes out upward (arrow P ') while abutting on the rear side wall 11a of the seating portion 11, and becomes a state of gradually rising and lying down (see FIG. 4A).

Since the sofa according to the third embodiment of the present invention is constituted as described above, it has the following operation. (1) The lower part of the backrest 12 can be moved rearward and downward by the link mechanism simply by pushing the seating part 11 backward, so that the sofa 31 can be easily raised and the functionality and Excellent usability. (2) The lower portion of the backrest 12 can be moved forward and upward by the link mechanism simply by pulling the seating portion 11 forward, so that the sofa 31 can be easily brought into a lying state, and the functionality and Excellent usability. (3) The fourth link member 9 'is connected to the elastic body 35, but in order to rotate the upper end of the third link member 8 backward (to bring the backrest 12 from a lying state to a raised state). Needs a force to extend the elastic body 35, and when the backrest 12 is in the lying state, the backrest 12
Even if a load such as a human body is applied to the body, the backrest 12 is not raised and the usability is excellent. (4) When the sofa 31 is raised, the fourth link member 9 ′ is urged forward by the elastic body 35.
The lower part of the front of the backrest 12 is the rear side wall 1 of the seating part 11.
Since the seat portion 11 is locked to the lower portion of the sofa 1a, the seat portion 11 does not easily move forward, so that the stability when the sofa 31 is raised and the safety are excellent. (5) Since the fourth link member 9 'is formed in an L shape, it does not hinder the downward movement of the seating portion 11 and the backrest portion 12, and is excellent in usability. (6) The second link member 7 is formed by the first support members 33a and 33b.
Since the second link member 7 does not rotate, the backrest 12 side of the seating portion 11 can be prevented from sinking downward, and the stability of the seating portion 11 is excellent, and the seating portion 11 can be moved forward or backward. When the sofa is moved to the sleeping state or the sleeping state, the seating portion 11 can be prevented from moving up and down,
The sitting comfort of the seat 11 can be improved.

(Embodiment 4) A perspective view of a sofa according to Embodiment 4 of the present invention is similar to that of Embodiment 1, and will be described with reference to FIG. FIG. 5 (a) is a cross-sectional view taken along line AA of FIG. 1 showing a state in which the backrest portion is lying down in the fourth embodiment of the present invention, and FIG. FIG. 2 is a cross-sectional view taken along line BB of FIG. 1 showing a state in which the backrest portion is raised. FIG.
, 2 is a sofa frame, 2a is a lower stand, 2b is a back support, 2 'is an armrest, 3 is a sofa body, 4 is a base frame, 7 is a second link member, 8 is a third link member, and 9' is a A fourth link member, 9a is a short member, 9b is a long member, 11 is a seating portion, 11a is a rear side wall, 12 is a backrest portion, 12a is a lower end portion, 22 is a fifth link member, 24
Are contact portions, which are the same as those in the above-described embodiment, and are denoted by the same reference numerals and description thereof is omitted. 4
1 is a sofa in Embodiment 4 of the present invention, 7c is a sliding groove formed a predetermined length from the middle in the longitudinal direction of the second link member 7 to the rear end side, and 42 is a fifth link at the lower end. A first support member 43 fixed to the base frame 4 behind the member 22 is a sliding pin formed at the upper end of the first support member 42 and slidably engaged with the slide groove 7c, and 44 is one end. Is an elastic body such as a spring fixed to the front side of the base frame 4 and the other end fixed to the short member 9a of the fourth link member 9 '.

Regarding the sofa configured as described above in the fourth embodiment, the case where the backrest portion is brought up from a sleeping state and the case where the backrest portion is brought up from a sleeping state will be described below with reference to the drawings. I will explain while. (1) When the backrest is changed from a lying state to a raised state. In FIG. 5A, first, the seating portion 11 is moved to the backrest portion 1.
Move to the 2nd side (rear) (push in). This allows
The second link member 7 is connected to the sliding pin 43 of the first support member 42.
Move backward while being supported by the arrow (arrow c '). Also,
The fifth link member 22 rotates in the direction of the arrow e ′, and the seat 1
1 while moving backward (arrow c '). The fourth link member 9 'is moved rearward (arrow f') while urging the elastic body 44 by the movement of the second link member 7, and the third link member 9 '
The pivot portion with the link member 8 is also moved rearward (arrow g '), and the third link member 8 is largely pivoted rearward and inclined about the pivot portion with the base frame 4 to be inclined. The shaft support between the backrest 8 and the backrest 12 is also moved downward (toward the base frame 4) and backward (arrow h '). The back portion of the backrest portion 12 is moved downward and backward by the third link member 8 while the back surface is supported by the upper end portion of the back support portion 2b (arrow h '), so that the lower portion of the front surface is seated. The portion 11 enters while abutting on the rear side wall 11a (arrow i '), and gradually rises down (see FIG. 5B). At this time, the fourth link member 9 ′ is urged forward by the elastic body 44, but the lower part of the front surface of the backrest part 12 is the seating part 11.
The seat 11 is not moved forward because it is locked to the lower part of the rear side wall 11a.

(2) A case where the backrest portion is changed from a raised state to a lying state. In FIG. 5B, first, the seat 11 is moved forward (pulled out). Thereby, the second link member 7
It moves forward while being supported by the sliding pins 43 of the first support member 42 (arrow j '). Further, the fifth link member 22 rotates in the direction of arrow l ', and moves the seating portion 11 obliquely downward and forward (arrow j'). With the movement of the second link member 7, the front end of the fourth link member 9 'is moved forward (arrow m') while being pulled by the restoring force of the elastic body 44, and the fourth link member 9 ' 3 link member 8
Is also moved forward (arrow n '), and the third link member 8 is largely pivoted forward and inclined about the shaft support with the base frame 4 to be inclined with the third link member 8 and the backrest. The pivot with the part 12 is also moved upward and forward (arrow o '). The back of the backrest 12 is moved upward and forward by the third link member 8 (arrow o ') while the upper part of the back is supported by the upper part of the back support 2b (arrow o'). The lower part of the front surface comes out upward (arrow p ′) while abutting on the rear side wall 11a of the seating portion 11 and gradually rises to a lying state, and the abutting portion 24 abuts on the upper surface of the base frame 4. It stops (see FIG. 5A).

Since the sofa according to the fourth embodiment of the present invention is configured as described above, it has the following operations. (1) The lower part of the backrest 12 can be moved rearward and downward by the link mechanism simply by pushing the seating part 11 backward, so that the sofa 41 can be easily raised and the functionality and Excellent usability. (2) The lower portion of the backrest 12 can be moved forward and upward by the link mechanism simply by pulling the seating portion 11 forward, so that the sofa 41 can be easily brought to a lying state, and the functionality and Excellent usability. (3) The fourth link member 9 'is connected to the elastic body 44. However, in order to rotate the upper end of the third link member 8 backward, a force sufficient to extend the elastic body 44 is required. Yes, when the backrest 12 is in a lying state, the backrest 12
Even if a load such as a human body is applied to the body, the backrest 12 is not raised and the usability is excellent. (4) When the sofa 41 is raised, the fourth link member 9 ′ is urged forward by the elastic body 44.
The lower part of the front of the backrest 12 is the rear side wall 1 of the seating part 11.
Since the seat portion 11 is locked to the lower portion of the sofa 1a, the seat portion 11 does not easily move forward, so that the stability when the sofa 41 is raised and the safety are excellent. (5) Since the elastic body 44 absorbs the impact on the backrest 12, the burden on the human body is small and the usability is excellent. (6) Since the fourth link member 9 'is formed in an L shape, it does not hinder the downward movement of the seating portion 11 and the backrest portion 12, and is excellent in usability. (7) The contact portion 24 abuts on the upper surface of the base frame 4, so that the seat portion 11 can be prevented from moving too downward.

[0043]

According to the first aspect of the present invention, the following effects can be obtained. (1) The second link member is moved rearward while the sliding groove is supported by the sliding pin by moving the seating portion rearward (backrest side). The upper end of the first link member is moved (rotated) rearward by the second link member around the pivotal support with the base frame. The fourth link member has the front end moved rearward by the first link member and presses the third link member rearward at the rear end.
The upper end of the third link member is moved (rotated) rearward about a shaft supporting portion with the base frame. The back part,
The lower portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and a raised state is obtained. Therefore, since the backrest can be linked with the seating part by a simple operation, the state can be changed from a state of sleeping to a state of rising,
It can be used as a reception area and has excellent usability (2) By moving the seat forward, the second link member is moved forward while the sliding groove is supported by the sliding pin. The upper end of the first link member is moved (rotated) forward by the second link member about the pivotal support portion with the base frame. The fourth link member has a front end portion of the first link member.
The third link member is moved forward by the link member and is pulled forward at the rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved forward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (4) By simply moving the seating part to the backrest side (rearward) or forward, the sofa can be put up or lying down, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience.

According to the second aspect of the present invention, the following effects can be obtained in addition to the effects of the first aspect. (1) When moving the seating part rearward (backrest part side),
Since the first link member is moved rearward and upward (rotated), the second link member and thus the seating portion are moved rearward while the rear portion is raised. On the other hand, the upper end of the third link member is moved rearward and downward (rotated), so that the backrest is moved rearward while the lower part is lowered. Therefore, the backrest portion is in a state in which the lower portion has entered the rear of the seating portion and is raised, so that the height of the backrest portion can be made lower than in the lying state, and the usability is excellent. (2) Since the first link member is moved forward (downward) when moving the seat portion forward, the second link member and thus the seat portion are moved forward while the rear portion is lowered. Can be On the other hand, since the upper end of the third link member is moved forward (turned) upward, the backrest is moved forward while the lower portion is raised.
Accordingly, the backrest portion is in a state where the lower portion of the backrest portion comes out upward from the rear of the seating portion and lies down, so that the length of the backrest portion can be made longer than in the raised state, and the usability is excellent.

According to the third aspect of the present invention, the following effects can be obtained. (1) The second link member is moved rearward while being pivotally supported by the upper ends of the first link member and the fifth link member by moving the seating portion rearward (backrest side). The upper end of the first link member is moved (rotated) rearward by the second link member around the pivotal support with the base frame. The fourth link member has the front end moved rearward by the first link member and presses the third link member rearward at the rear end. The upper end of the third link member is
It can be moved (rotated) rearward around a shaft support with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state. Therefore, the backrest can be linked to the seating part by a simple operation to change the state from a lying state to a state in which the backrest is raised, so that it can be used as a reception area and is excellent in usability. (2) By moving the seat portion forward, the second link member is moved forward while being pivotally supported by the upper end portions of the first link member and the fifth link member. The upper end of the first link member is moved (rotated) forward by the second link member about the pivotal support portion with the base frame. The fourth link member has its front end moved forward by the first link member and pulls the third link member forward at its rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved forward by the third link member while the upper portion of the back surface is supported by the back support portion, so that the backrest portion is in a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the arrangement angles of the first link member and the fifth link member with respect to the base frame are substantially the same, the angle of the second link member (seating portion) with respect to the base frame in the lying state and in the raised state is different. Identical and excellent in usability. (4) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (5) By simply moving the seating portion to the backrest side (rearward) or forward, the sofa can be placed in a raised or lying state, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience.

According to the fourth aspect of the present invention, the following effects can be obtained. (1) By moving the seat portion rearward, the second link member is moved rearward while the sliding groove is supported by the sliding pin of the first support member. The front end of the fourth link member is moved rearward by the movement of the second link member, and the rear end presses the third link member rearward. The upper end of the third link member is moved (rotated) rearward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state.
Therefore, the backrest can be linked to the seating part by a simple operation to change the state from the sleeping state to the raised state, so that it can be used for reception and is excellent in usability. (2) By moving the seat portion forward, the second link member is moved forward while the sliding groove is supported by the sliding pin of the first support member. The front end of the fourth link member is moved forward by the movement of the second link member, and the fourth link member pulls the third link member forward at the rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved forward and upward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a lying state. Therefore, the backrest portion can be linked to the seating portion by a simple operation, so that the backrest portion can be changed from a raised state to a lying state,
You can easily change to a relaxed state, diversity,
Excellent convenience. (3) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (4) By simply moving the seating part to the backrest side (rearward) or forward, the sofa can be put up or lying down, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience. (5) Since two or more first support members are provided, the second link member does not rotate, and the backrest side of the seating portion can be prevented from sinking downward (the base frame side), and the stability of the seating portion can be improved. Also, when the seat is moved forward or backward to bring the sofa to a lying state or a standing state, the sitting part does not move up and down, and the sitting part is excellent in sitting comfort.

According to the fifth aspect of the present invention, the following effects can be obtained. (1) The second link member is moved rearward while the sliding groove is supported by the sliding pin of the first support member by moving the seating portion rearward (backrest side). The upper end of the fifth link member is moved (rotated) rearward around the pivotal support portion with the base frame by the movement of the second link member. The front end of the fourth link member is moved rearward by the movement of the second link member, and the fourth link member presses the third link member rearward at the rear end. The upper end of the third link member is moved (rotated) rearward about a shaft supporting portion with the base frame. The lower portion of the backrest portion is moved rearward by the third link member while the upper portion of the back surface is supported by the back support portion, and the backrest portion is in a raised state. Therefore, the backrest can be linked to the seating part by a simple operation to change the state from the sleeping state to the raised state, so that it can be used for reception and is excellent in usability. (2) By moving the seat portion forward, the second link member is moved forward while the sliding groove is supported by the sliding pin of the first support member. The upper end portion of the fifth link member is moved (rotated) forward around the shaft supporting portion with the base frame by the movement of the second link member. The front end of the fourth link member is moved forward by the movement of the second link member, and the fourth link member pulls the third link member forward at the rear end. The upper end of the third link member is moved (rotated) forward about a shaft supporting portion with the base frame.
The lower portion of the backrest portion is moved forward and upward by the third link member while the upper portion of the back surface is supported by the back support portion, and is brought into a lying state. Therefore, since the backrest can be changed from a raised state to a lying state by interlocking with the seating part by a simple operation, the state can be easily changed to a relaxed state, which is excellent in versatility and convenience. (3) Since the number of members constituting the link mechanism is small, the maintainability is excellent and the productivity is excellent. (4) By simply moving the seating part to the backrest side (rearward) or forward, the sofa can be put up or lying down, and can be easily adjusted to the user's preference and use state. Excellent usability and convenience.

According to the sixth aspect of the present invention, the following effect can be obtained in addition to the effect of any one of the first to fifth aspects. (1) First link member, third link member, or fourth link member
Since the link member is connected to the vertical frame, the base frame, or the first support member by an elastic body, it is necessary to move the upper end of the first link member, the third link member, or the fourth link member backward to a certain extent. Force is required. As a result, even when a load such as a human body is applied to the backrest when the backrest is lying down, the backrest is not raised and the usability is excellent. (2) Since the elastic body absorbs the impact on the backrest, the burden on the human body is small and the usability is excellent.

According to the seventh aspect of the present invention, the following effect can be obtained in addition to the effect of any one of the first to sixth aspects. (1) When the first link member or the fourth link member is at a predetermined inclination angle, the contact portion contacts the upper surface of the base frame, so that the first link member or the fourth link member is excessively inclined. This prevents the seating portion from moving too downward (toward the base frame), and is excellent in usability and safety.

According to the eighth aspect of the present invention, the following effect can be obtained in addition to the effect of any one of the first to seventh aspects. (1) Since the backrest is supported by the auxiliary link member in addition to the third link member, it is possible to prevent the backrest from easily rotating around the third link member when the sofa is used, thereby preventing the backrest from shaking. As a result, the stability of the backrest portion is excellent, and the backrest portion can be reliably supported, and the safety is excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a sofa according to a first embodiment of the present invention.

FIG. 2 (a) is a cross-sectional view of a principal part taken along line AA of FIG. 1 showing a state in which the backrest portion is lying down according to the first embodiment of the present invention. (B) A backrest portion according to the first embodiment of the present invention. Sectional view taken along the line BB in FIG.

FIG. 3 (a) is a cross-sectional view of a main part taken along line AA of FIG. 1 showing a state in which a backrest portion is lying down in Embodiment 2 of the present invention. (B) A backrest portion in Embodiment 2 of the present invention. Sectional view taken along the line BB in FIG.

FIG. 4 (a) is a cross-sectional view of a principal part taken along line AA of FIG. 1 showing a state in which a backrest portion is lying down in Embodiment 3 of the present invention. (B) A backrest portion in Embodiment 3 of the present invention. Sectional view taken along the line BB in FIG.

FIG. 5 (a) is a cross-sectional view of a principal part taken along line AA of FIG. 1 showing a state in which a backrest portion is lying down in Embodiment 4 of the present invention. (B) A backrest portion in Embodiment 5 of the present invention. Sectional view taken along the line BB in FIG.

FIG. 6 is a perspective view of a main part of a conventional sofa.

[Explanation of symbols]

 1, 21, 31, 41, sofa 2 sofa frame 2a lower base 2b back support 2 'armrest 3 sofa body 4 base frame 5 vertical frame 5a, 33a, 33b, 43 sliding pin 6 first link member 7 second link Member 7a, 7b, 7c Sliding groove 8 Third link member 9, 9 'Fourth link member 9a Short member 9b Long member 9c, 24 Contact portion 10, 23, 35, 44 Elastic body 11 Seating portion 11a Rear side wall Reference Signs List 12 backrest part 12a lower end part 22 fifth link member 32a, 32b, 42 first support member 34 auxiliary link member 51 conventional sofa 52 sofa body 53 backrest 54 accommodation space 55 seat 56 caster

Claims (8)

[Claims] 1. A sofa having a seat portion and a backrest erected behind the seat portion, wherein the base frame is a base frame provided below the seat portion and the base frame. A sofa frame having a lower base for fixing the backrest and a back support part for supporting the back of the backrest part, a vertical frame erected on the front end of the base frame, and a slide protruding from an upper part of the vertical frame. idea,
A first link member having a lower end pivotally supported by the base frame; and a second link member fixed to the seating portion substantially horizontally with the base frame and a rear end pivotally supported by an upper end of the first link member.
A link member, a slide groove having a groove portion slidably held by the slide pin and having a predetermined length formed from a front end portion of the second link member to a middle portion in the length direction, and a lower end portion of the first link member having the first length. A third link member pivotally supported by the base frame behind the link member (on the backrest side) and having an upper end pivotally supported by a lower portion of the backrest portion; A fourth link member which is pivotally supported at the other end and whose other end is pivotally supported in the middle of the length direction of the third link member. 2. The sofa according to claim 1, wherein the first link member is disposed to be inclined forward, and the third link member is disposed to be inclined rearward. 3. A sofa having a seat portion and a backrest standing upright behind the seat portion, wherein the base frame is a base frame disposed below the seat portion and a base frame. A sofa frame having a lower base for fixing the backrest and a back support for supporting the back of the backrest, a first link member having a lower end pivotally supported by the base frame, and the seating part substantially horizontally with the base frame. A second link member whose rear end portion is fixed to the upper end side of the first link member and whose lower end portion is pivotally supported by the base frame rearward (backrest side) of the first link member. A third link member pivotally supported at a lower portion of the backrest portion, one end pivotally supported at an intermediate position in the longitudinal direction of the first link member, and the other end pivotally supported in the longitudinal direction of the third link member. A fourth link member pivotally supported A lower end is pivotally supported by the base frame in front of the first link member, and an upper end is pivotally supported by a predetermined portion on the front end side of the second link member. And a fifth link member substantially identical to the above. 4. A sofa having a seating portion and a backrest standing upright behind the seating portion, wherein the base frame is a base frame disposed below the seating portion, and the base frame. A sofa frame having a lower base for fixing the backrest and a back support for supporting the back of the backrest, two or more first support members having lower ends fixed to the front end of the base frame, and the first support A sliding pin formed at the upper end of the member, a second link member fixed to the seating portion substantially horizontally with the base frame, and a predetermined length from the front end of the second link member to the middle in the length direction. A sliding groove formed to have a length and slidably held by the sliding pin; and a second groove having a lower end pivotally supported by a rear end of the base frame and an upper end pivotally supported by a lower portion of the backrest. 3 link member, one end of the second link member A fourth link member pivotally supported at the rear end side (backrest side) of the member and the other end pivotally supported at an intermediate position in the longitudinal direction of the third link member. sofa. 5. A sofa having a seat portion and a backrest standing upright behind the seat portion, wherein the base frame is a base frame provided below the seat portion and the base frame. A sofa frame having a lower base for fixing the backrest and a back support for supporting the back of the backrest, a first support member having a lower end fixed to the base frame, and an upper end formed on the upper end of the first support member. A sliding pin, a second link member fixed to the seat portion substantially horizontally with the base frame, and a sliding member formed with a predetermined length from a middle portion of the second link member in a longitudinal direction to a rear end side. A sliding groove slidably held by the moving pin, a lower end pivotally supported by the base frame behind (the backrest side of) the first support member, and an upper end pivotally supported by a lower portion of the backrest. Third link member and one end A fourth link member pivotally supported at the rear end side of the second link member behind the first support member and having the other end pivotally supported in the middle of the length direction of the third link member; A fifth link member pivotally supported by the base frame in front of the first support member and an upper end pivotally supported by a predetermined portion on the front end side of the second link member. Sofa to do. 6. An elastic body having one end fixed to the vertical frame or the base frame or the first support member and the other end fixed to the first link member, the third link member, or the fourth link member. The sofa according to any one of claims 1 to 5, characterized in that: 7. The first link member or the fourth link member is protruded in the middle of the length direction of the first link member or the fourth link member, and abuts on the upper surface of the base frame so that the first link member or the fourth link member is excessively inclined. The sofa according to any one of claims 1 to 6, further comprising an abutting portion for preventing the sofa from performing. 8. A lower end portion is pivotally supported by the base frame in front and / or rearward of the third link member, and an upper end portion is pivotally supported by a lower portion of the backrest. The sofa according to any one of claims 1 to 7, further comprising an auxiliary link member that is substantially the same as the three link members.