KR101691858B1 - Chair assembly - Google Patents

Abstract

The present invention relates to a chair assembly. The chair assembly has a seat plate to be elevated according to backward tilting of a back plate. Thus, the back plate is able to be tilted backward when applying force corresponding to a resultant force obtained by adding the elastic force of a spring and a load corresponding to the weight of a sitter such that a degree of tilting is automatically controlled while sensing the weight of the sitter, thereby providing user convenience. According to the present invention, the chair assembly comprises a seat plate coupling part, a main body part, a link part, a back plate coupling part and an elastic force providing part. The seat plate coupling part is coupled to the seat plate. The main body part is positioned on a lower part of the seat plate coupling part. The link part comprises a first link means and a second link means. The first link means has one end coupled to the front side of the seat plate coupling part through a hinge and the other end coupled to the front side of the main body part through a hinge. The second link means is positioned on the rear side of the main body part to be axially rotated and has one end coupled to the rear side of the seat plate coupling part through a hinge and the other end coupled to the rear side of the main body part through a hinge. The back plate coupling part is coupled to the second link means to be integrally interlinked and allows the back plate to be coupled thereto. The elastic force providing part is embedded in the main body part to elastically support the other side of the second link means. The seat plate is elevated in linking with backward tilting of the back plate.

Description

Chair assembly {CHAIR ASSEMBLY}

More specifically, the present invention relates to a chair assembly, and more particularly, to a chair assembly, which is configured so that a seat plate is raised in conjunction with a back plate inclining rearward, so that an elastic force of a spring and a weight corresponding to a weight of a seated person, The back plate can be inclined rearwardly by applying a force so that the strength of the tilting can be automatically adjusted in response to the weight of the occupant so that the chair assembly can be easily accommodated by the user.

1, a conventional chair assembly 1 includes an upper housing 3, a lower housing 4, a gas cylinder 5 installed at one side bottom of the lower housing 4, A leg 6 provided at a lower portion of the gas cylinder 5, a caster 7 provided at each leg 6, a back frame connecting rod 8 installed at an upper portion of the upper housing 3, A pair of seat frame 9 mounted on both sides of the frame housing 8 and the upper housing 3, a seat 11 mounted on the upper surface of the seat frame 9, A pair of armrests 14 disposed on both sides of the housing 3 and 4 and located on both sides of the seat 5, .

The chair assembly 1 may be configured such that the back plate is tilted backward by a tilting mechanism when the back of the back is tilted by the user for stretching or the like, and the back plate and the seat plate are integrally formed and tilted at the same time, And the back plate and the seat plate are separately constructed and tilted.

The tilting mechanism includes a tilting strength adjusting unit that can adjust the tilting strength of the back plate according to the user's body condition in consideration of various user layers (male and female). Conventionally, The tilting strength of the back plate is manipulated by controlling the elasticity of the coil spring by forward rotation or reverse rotation so that the operation is difficult and uncomfortable and the tilting strength is hardly adjusted to the strength desired by the user, And durability is low.

Korean Patent Publication No. 10-0679152 (Registered on Feb. 06, 2007)

Korean Utility Model Registration No. 20-0450655 (Registration Notice of October 20, 2010)

Registered Utility Model No. 20-0390030 of Korea Register (2005. 07. 18. Registration Notice)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems of the prior art, and it is an object of the present invention to provide a seat for a seat occupant, which is constructed such that a seat is raised in conjunction with a back plate inclined rearward, The back plate can be inclined rearwardly by applying a corresponding force, so that the chair assembly responds to the weight of the seated person and automatically adjusts the strength of the tilted seat so that the user can comfort the seat.

According to an aspect of the present invention, there is provided a chair assembly comprising: a seat plate engaging portion coupled to a seat plate; A main body part connected to a lower portion of the seat plate engaging part through a link part; A back plate engaging part coupled to the link part on one side to rotate in conjunction with a linking operation of the link part, and a back plate coupled to the other side to tilt the back plate in a forward and backward direction; And an elastic force providing means for applying an elastic force to the link portion to maintain the back plate in a forwardly tilted state, wherein the link portion is linked with the back plate in such a manner that the back plate is moved upward .

Preferably, the link portion includes: a first link portion having one end hinged to the front side of the seat plate engaging portion and the other end hinged to the front side of the main body portion; And a second link part connected to the rear side of the main body part so as to be rotatable about the center of the main body part, the second link part having one end extended forward and hinged to the rear side of the seat connection part.

The other end of the second link portion may extend toward the front lower side of the main body portion.

Preferably, the central portion of the second link portion is rotatable through a rotation shaft passing through the rear side of the main body portion.

Preferably, the second link portion may include a pair of rear links provided on both sides of the rear seat coupling portion, respectively, so that the second link portion can rotate on both sides of the rotation shaft.

Preferably, one end of the pair of rear links may be hinged through a rear first link shaft provided to cross both rear sides of the seat panel engaging portion.

Preferably, an anti-twist pipe may be inserted coaxially outside the rear first link shaft.

The other end of the pair of rear links may be hingedly connected to a rear second link shaft spaced apart from the lower portion of the main body portion so as to cross both sides.

Preferably, the first link portion includes a pair of front links that hinge-connect the front both sides of the left-hand plate engaging portion and the front both sides of the main body portion.

Preferably, one end of the pair of front links may be hinged through a front first link shaft passing through both front sides of the seat connection portion.

Preferably, the anti-twist pipe may be coaxially inserted into the outer side of the front first link shaft.

Preferably, the other end of the pair of front links may be hinged through a front second link shaft passing through both front upper portions of the main body portion.

Preferably, the seat plate engaging portion includes a pair of base plate brackets provided on both sides of the lower portion of the seat plate.

Preferably, one end of the elastic force providing part is supported inside the front side of the main body part, and the other end of the elastic force providing part is supported by the rotating shaft.

Preferably, the limit operation base is provided in the main body so as to be rotatable about an axis parallel to the rotation shaft, the plurality of tilting step recesses being formed in a circumferential shape so as to have different radii, And the tilting angle of the back plate coupling portion is limited in a stepwise manner as the rotation shaft is engaged with any one of the plurality of tilting step grooves of the limit operation member.

Preferably, the limit actuating bar is axially rotatably mounted on a limit lever bar inserted axially so as to extend outwardly from one side of the main body, is fixedly coupled to the outside of the limit lever bar and has a cam And a connecting rod extending through the main body portion to be connected to the limit actuating cam piece is provided at one extension of the limit actuating bar, and the plurality of tilting step grooves are formed at the other extension of the limit actuating bar And a stop hole having a plurality of step-adjusting grooves formed in the corresponding portion of the main body portion through which the connecting rod passes, the connecting rod being selectively rotatable.

Preferably, the cylinder lever is axially inserted to extend outside the other side of the main body portion. A cylinder operation link formed on one side with a cam member for height adjustment and coaxially fixedly coupled to an end of the cylinder lever; And the other end of which is pressurized to open and close the gas cylinder so that the height of the gas cylinder can be adjusted by elevating one side thereof by the height adjusting cam, ; ≪ / RTI >

Preferably, a first limiting surface is formed at one end of the cylinder operation connecting rod to limit an upward adjustment range of the height adjusting cam member as it is hooked on a predetermined portion of the main body portion, And a second restricting surface may be formed at an end portion of the main body so as to restrict a downward adjustment range of the height adjusting cam as it is hooked on a predetermined portion of the main body.

Preferably, a long slot is formed along the forward and backward direction at a joint portion of the seat plate engaging portion coupled to a lower portion of the seat plate, and a plurality of front and rear determination grooves are formed at one side of the seat plate engaging portion along the formation direction of the slot. have.

Preferably, the resilient force providing portion includes: a spring holder rear portion, one end of which is mounted on a front inner lower surface of the main body portion; A spring holder front having one end mounted on a portion of the second link portion and the other end being retractably inserted into the inside of the spring holder rear; And an elastic spring mounted between the spring holder rear and the spring holder front to provide an elastic force.

Preferably, a pair of semicircular grooves is formed at one end of the spring holder rear, a spherical groove is formed between the pair of semicircular grooves, and a front inner side lower portion of the main body portion corresponding to the pair of semicircular grooves A pair of semicircular protrusions is formed on a surface of the main body portion, a spherical protrusion is formed on a front inner lower surface of the main body portion corresponding to the spherical groove, and the pair of semicircular protrusions are inserted into the pair of semicircular grooves, And the spherical protrusion may be inserted into the spherical groove and hooked.

As described above, according to the present invention, since the seat back is configured to rise in conjunction with the inclination of the back plate, a force corresponding to the sum of the elastic force of the spring and the weight corresponding to the weight of the seated person, The tilting strength can be automatically adjusted in response to the body weight of the seated person, so that the user can enjoy the convenience.

In addition, since the present invention is configured to be mountable on the bottom surface of a seat of a chair, the present invention is advantageous in that it can be mounted on a seat of various chairs.

In addition, the tilting interval can be automatically adjusted in response to the body weight of the seated person, and the tilting angle of the back plate can be adjusted to a range desired by the seated person.

Further, there is an advantage that the left-hand plate engaging portion, which is engaged with the left-hand plate, can be moved and fixed relative to the left-hand plate relative to the left-hand plate so as to be used as a seat position optimized for the body of the occupant.

1 is a side view showing a state where a conventional chair assembly is applied to a chair;
2 is a side view showing a state where a chair assembly according to an embodiment of the present invention is applied.
3 is an assembled perspective view of a chair assembly in accordance with an embodiment of the present invention.
4 is a partially exploded perspective view of a chair assembly in accordance with an embodiment of the present invention.
5 is an exploded perspective view of a chair assembly according to an embodiment of the present invention.
6 is an exploded perspective view illustrating a seat plate engaging portion, a link portion, and a back plate engaging portion of a chair assembly according to an embodiment of the present invention.
7 is a top cross-sectional view showing a flat section of a chair assembly according to an embodiment of the present invention.
8 is a view showing a state before the tilting of the back plate in a state where the tilting angle of the chair assembly according to the embodiment of the present invention is set to one tier.
9 is a view illustrating a state after the tilting of the back plate in a state where the tilting angle of the chair assembly according to the embodiment of the present invention is set to three tiers.
10 is a view showing a state for operating a gas cylinder of a chair assembly according to an embodiment of the present invention.
11 is a perspective view showing a modified example of a seat plate engaging portion of a chair assembly according to an embodiment of the present invention.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The chair assembly according to an embodiment of the present invention is installed at a lower portion of a chair seat 21 as shown in FIG. 2, and includes a seat connection portion 100, The main body part 300, the back plate coupling part 400 and the elastic force providing part 500 are embedded between the upper cover 11 and the lower cover 13, (200) is linked so that the seat (21) is raised in conjunction with the inclination of the back plate (23) to the rear.

As described above, since the seat 21 is raised in conjunction with the inclination of the backboard 23 of the chair through the link portion 200, the elastic force provided by the elastic force providing portion 500 The back plate 23 can be inclined rearwardly inclined so that the tilting force can be automatically applied to the occupant in response to the body weight of the occupant, The detailed configuration of the constituent elements and the interlocking relationship of the constituent elements will be described in detail.

First, the description will be made as to the above-described left-hand plate engaging portion 100. [

2 and 3, the seat panel engaging portion 100 is mounted on the lower surface of the seat panel 21 and includes a pair of base plate brackets (not shown) provided on both sides of the lower surface of the seat panel 21 110, and 120, respectively.

6, each of the bottom brackets 110 and 120 is formed in a substantially 'A' shape in cross section and can be mounted on a lower surface of the seat 21 by being disposed to face each other with a predetermined distance therebetween, One side of the link unit 200 may be connected to the vertical surfaces 111 and 121 of the bottom plate brackets 110 and 120 and the horizontal surfaces 113 and 123 of the bottom plate brackets 110 and 120 may be connected to the side plates Can be mounted on the lower surface of the main body 21.

Slot slots 113h and 123h are formed along the longitudinal direction on the horizontal surfaces 113 and 123 corresponding to the respective bottom plate brackets 110 and 120 abutting on both sides of the bottom surface of the seat plate 21, (Not shown) to be inserted into the slots 113h and 123h to be slidable.

Accordingly, as the protruding coupling portion is slidably inserted into the slot slots 113h and 123h, the upper portion of the chair including the seat plate 21 is slid in the front-rear direction relative to the chair assembly, It can become fixed.

A plurality of front and rear crystal grooves 113a may be formed in the horizontal surface 113 of the bottom plate bracket 110 along the forming direction of the slots 113h. Elastic insertion protrusions (not shown) provided on the bottom surface of the seat plate 21 configured to be selectively insertable into any one of the plurality of front and rear crystal grooves 113a are selectively inserted into any one of the plurality of front and rear crystal grooves 113a The position of the seat assembly 21 relative to the seat assembly 21 in the forward and backward directions can be fixed with respect to the chair assembly.

Although the description has been given of the base brackets 110 and 120 formed with the slots 113h and 123h in the above description, the base brackets 110 'and 120' The holes 110'h and 120'h may be formed and fixedly mounted on the lower surface of the seat 21. [

The seat assembly 100 may be coupled to a seat 21 of a chair so that one side of the link 200 can be connected to the seat 200. As long as one side of the link 200 is rotatable, The present invention is not limited thereto. For example, in addition to the above-described bottom plate brackets 110, 120, 110 ', 120', the seat plate engaging portion may be composed of one frame or three or more pieces.

Meanwhile, between the bottom brackets 110 and 120, a anti-twist shafts 131 having coaxial anti-twist pipes 133 may be provided.

Next, the link unit 200 will be described.

4 to 6, the link portion 200 is a link-operating portion for raising the seat plate 21 of the chair in conjunction with the back plate 23 of the chair being inclined rearward, And a second link portion.

The first link portion is formed in a substantially linear shape and has one end hinged to the front side of the seat panel engaging portion 100 and the other end hinged to the front side of the main body portion 300. [

The first link part may include a pair of front links 211 hinged to both the front sides of the left and right side plate joint parts 100 and the front side of the main body part 300, respectively.

Specifically, a front first link shaft 213 passing through both sides of a front lower portion (a vertical portion 111, 121) of the seat plate engaging portion 100 is provided, and the pair of front links 211 May be hingedly connected to the left plate coupling part 100 so as to be rotatable relative to the left plate coupling part 100 while passing through the front first link shaft 213. [ The anti-twist pipe 215 is coaxially inserted into the outer side of the front first link shaft 213 to prevent the front first link shaft 213 from being twisted and to reinforce the strength.

A front second link shaft 217 passing through both sides of the front upper portion of the main body 300 is provided and the other end of the pair of front links 211 is connected to the front second link shaft 217 So that the main body 300 can be hingedly connected to the main body 300 in a relatively rotatable manner.

At this time, the front second link shaft 217 may be provided so as to penetrate a pair of linking extension portions 301 extending upward from both sides of the front upper portion of the main body portion 300.

A stopper projection 211b-1 is integrally formed at the other end of the pair of front links 211. A corresponding portion of the main body portion 300 corresponding to the rotation range of the stopper projection 211b- A stopper contact surface 303 is provided to limit the rotation range of the front link 211 when the stopper projection 211b-1 is caught.

The second link portion is formed to be close to a substantially V shape and a central portion of the second link portion is inserted into a rotation shaft 222 passing through the rear side of the main body portion 300, Respectively.

And the other end of the second link part is extended toward the front lower side of the main body part 300. The other end of the second link part is extended toward the front lower side of the main body part 300, .

Specifically, the second link portion includes a pair of rear links 221, and a central portion of each of the rear links 221 is axially inserted into both sides of the rotation shaft 222 so as to be rotatable about their axes And the rear brackets 110 and 120 constituting the left-hand plate engaging portion 100, respectively.

Specifically, a rear first link shaft 223 which passes through both sides of the lower portion (the vertical portion 111, 121) of the rear side of the seat plate engaging portion 100 is provided, and the pair of rear links 221 May be hingedly connected to the left plate coupling part 100 so as to be rotatable relative to the left plate coupling part 100 while being passed through the rear first link shaft 223. The anti-twist pipe 224 is coaxially inserted into the outer side of the rear first link shaft 223 to prevent twisting of the rear first link shaft 223 and to reinforce the strength.

The rear second link shaft 225 is spaced apart from the rear lower portion of the main body 300 so as to cross both sides of the main body 300. The other end of the pair of rear links 221 is connected to the rear second link shaft 221, (225).

As described above, according to the configuration of the link unit 200 constituted by the first link portion and the second link portion, when the weight of the seated person acts on the seat plate 21, a downward load is applied to the seat plate engaging portion 100 A downward load is applied to one end of the pair of front links 211 and one end of the pair of rear links 221, A moment that the rear link 221 tries to rotate in the counterclockwise direction (referring to FIG. 8) around the rotation shaft 222 is generated by the 'V' shape. The magnitude of the moment increases in proportion to the load of the seated person.

Next, the main body 300 will be described.

The main body part 300 is installed between the upper cover 11 and the lower cover 13 and connected to the lower part of the left plate coupling part 100 through the link part 200.

The main body part 300 constitutes a basic skeleton for mounting the link part 200, the back plate coupling part 400 and the elastic force providing part 500 to the chair assembly, A portion for connecting the elastic force providing member 500 and an angle limiting member to be described later, and a space in which a component for actuating the gas cylinder 30 can be located may be provided .

Next, the back plate coupling portion 400 will be described.

As shown in FIG. 4, one side of the back plate coupling part 400 is coupled with the link part 200 to rotate in conjunction with the link operation of the link part 200, and a back plate 23 And tilts the back plate 23 in the front-rear direction.

More specifically, one side of the back plate coupling part 400 is configured to be coupled to the center of the pair of rear links 221 in a state where the rotation shaft 222 passes through the pair of rear links 221, And a back plate 23 for supporting the back of the seated person is connected and assembled to the other side of the back plate engaging part 400. [

Therefore, when the seat backrest assembly 23 assembled with the backboard 23 tilts by pushing the backboard 23 backward with the back seat 23 with the seat occupant sitting on the seat back 21, And the pair of the front link 211 and the rear link 221 are linked to each other in accordance with the rotation of the back plate coupling part 400. [

At this time, since the link portion 200 is operated to link up the seat back 21 in conjunction with the inclination of the backboard 23 of the seat backward, the seat occupant can perform a link operation with a force greater than the load corresponding to his or her body weight The elasticity of the elasticity supporter 500 that provides the elastic force to the link portion 200 also works together with the load described above. As a result, the seated person The tilting can be performed only by pushing the back plate 23 backward with a force larger than the sum of the load corresponding to the body weight and the elastic force of the elastic force providing member 500. [

Next, the elastic force providing part 500 will be described.

The elastic force providing part 500 is located in the inner space of the main body part 300 and provides an elastic force to the link part 200 so that the back plate 23 is elastically held .

One end of the elastic force providing part 500 is supported inside the front side of the main body part 300 and the other end of the elastic force providing part 500 can be supported by the rotary shaft 222, A spring holder front 520, and an elastic spring 530. As shown in FIG.

One end of the spring holder rear 510 is mounted on the front inner lower surface of the main body 300 and the other end is formed in the form of a bushing toward the spring holder front 520 side.

Specifically, a pair of semicircular grooves 510h1 is formed at one end of the spring holder rear 510, a spherical groove 510h2 is formed between the pair of semicircular grooves 510h1, A pair of semicircular protrusions 311 are formed on the front inner lower surface of the main body part 300 corresponding to the semicircular groove 510h1 and a pair of semicircular protrusions 311 are formed on the inner lower surface of the main body part 300 corresponding to the semicircular groove 510h1, The spherical protrusion 313 is formed in the front inner lower surface and the pair of semicircular protrusions 311 is inserted and seated in the pair of semicircular grooves 510h1 and inserted into the spherical groove 510h2, The projection 313 can be inserted and hooked.

One end of the spring holder front 520 is mounted on the rotation shaft 222 and the other end is formed so as to be elastically inserted into the spring holder rear 510.

One end of the spring holder front 520 may be formed to have a hook shape and may be coupled to be fitted around the center portion of the rear second link shaft 225.

According to the structure of the spring holder 510 and the spring holder 520 as described above, the semicircular groove 510h1 and the spherical groove 510h2 of the spring holder rear 510 are connected to the main body 300 One end of the spring holder front 520 formed in a hook shape is hooked on the rear second link shaft 225 while being inserted into the semicircular protrusion 311 and the spherical protrusion 313 formed on the front inner lower surface, It is possible to assemble simply by fitting.

The elastic spring 530 is mounted between the spring holder rear 510 and the spring holder front 520 to provide an elastic force.

The elastic force of the resilient spring 530 acts to push the rear second link shaft 225 to the rear side so that the back plate 23 The forwardly tilted state can be resiliently maintained.

As described above, by the mechanism of the chair assembly including the seat plate engaging portion 100, the main body portion 300, the link portion 200, the back plate engaging portion 400 and the elasticity providing portion 500, The seat plate 21 of the chair is raised in conjunction with the inclination of the back plate 23, and the operation mechanism of the chair assembly will be described step by step.

First, when the occupant sits on the seat 21, the downward load corresponding to the body weight of the seated person is applied to the seat occupant 21 by gravity.

The downward load force of the seat 21 is transmitted to one end of the pair of front links 211 constituting the link portion 200 and one end of the pair of rear links 221 do.

The downward gravity force transmitted to one end of the pair of front links 211 and one end of the pair of rear links 221 is transmitted to the pair of forward links 211 and the pair of rear links 221, 221, and the magnitude of such a moment is proportional to the load of the seated person.

In such a state, in order for the seated person to sit on the seat plate 21 and tilt the back plate 23 backward, the back plate engaging portion 400 assembled with the back plate 23 should be rotated in the tilting direction of the back plate 23 At this time, the tilting direction of the back plate coupling portion 400 is opposite to the direction of the moment.

Since the elastic force of the elastic supporter 500 for providing the elastic force to the link portion 200 also acts in the same direction as the generation direction of the moment, the seated person can feel the moment generated by the load corresponding to his / The tilting can be performed only when the back plate 23 is pushed backward with a force larger than the sum of the elastic force of the elastic force providing unit 500.

Therefore, a heavy occupant sees a large force for tilting the backboard 23, and a lightweight occupant can tilt the backboard 23 with a relatively smaller force than a heavy occupant, As described above, the tilt intensity is automatically adjusted by the weight of the seated person, so that the convenience of the user can be improved.

The rear second link shaft 225 is engaged with the back plate 23 to adjust the tilting angle of the back plate 23 stepwise together with the interlocking operation of the back plate 23 and the seat plate 21 as described above, And a limit operation member 601 for allowing the tilting angle of the movable member 23 to be changed stepwise.

5, the limit actuating bar 601 is installed in the main body 300 such that the limit actuating bar 601 is rotatable about an axis parallel to the rear second link shaft 225. As shown in FIG.

Specifically, the limit actuating bar 601 is axially coupled to a limit lever bar 603, which is axially inserted to extend outwardly from one side of the main body 300, and the limit lever bar 603, And a limit actuating lever 605 having a limit actuating cam piece 605a formed at an end of the limit actuating lever 601. The limit actuating lever 601 is connected to the limit actuating cam piece 605a A plurality of tilting stepped grooves h1, h2 and h3 are formed in the other extension of the limit actuating table 601 and the connecting rod 605b penetrating through the main body part 300 is provided. H2, H3, and H4 are formed in the corresponding portion of the main body portion 300 through which the connecting rod 605b penetrates, have.

The plurality of tilting step grooves h1, h2, h3 and h4 are formed in a circumferential shape so as to have different radii, and one of the plurality of tilting step grooves h1, h2 and h3 of the limit operating rod 601 The tilting angle of the back plate coupling portion 400 may be limited in a stepwise manner as the rear second link shaft 225 is hooked on the back plate coupling portion 400.

For example, in the present embodiment, the tilting angle is limited from the first stage to the fourth stage, and the tilting angle is limited in the first stage (the connecting rod 605b is caught in the step adjustment groove H4, and the rear second link shaft 225 is tilted (The connecting rod 605b is caught in the step adjusting groove H3 and the rear second link shaft 225 is engaged with the step groove h1) (The linking rod 605b is caught in the stepping groove H2 and the rear second link shaft 225 is engaged in the tilting step groove h2) h3) of the tilting angle range is about 12 degrees and the tilting angle range is about 4 degrees (the connecting rod 605b is caught in the step adjusting groove H1 and the rear second link shaft 225 is not caught by the limit operating rod 601, Restricting rotation by the noise prevention pad 331) is limited so that the tilting angle range is approximately 20 degrees.

A noise prevention pad 331 for preventing the rear second link shaft 225 from hitting the main body 300 in a state of being located at a maximum rotation angle of the rear second link shaft 225 And may be provided in a corresponding portion of the main body unit 300.

The chair assembly further includes a cylinder lever 701, a cylinder operating rod 703 and a cylinder operating rod 705 for operating the gas cylinder 30 that adjusts the height of the seat 21 of the chair, do.

The cylinder lever 701 is axially inserted into a part of the main body part 300 so as to extend outside the other side of the main body part 300.

The cylinder operation link 703 has a height adjustment cam piece 703a formed on one side thereof and fixedly coupled to the end of the cylinder lever 701 in a coaxial manner.

The cylinder actuating table 705 is installed so as to be seesawed by being inserted into the rotary shaft 222 so that the cylinder actuating table 705 is relatively rotatable with the rotary shaft 222. One side of the cylinder actuating table 703a The other side presses the opening / closing pin 31 of the gas cylinder 30 so that the height of the gas cylinder 30 can be adjusted.

Meanwhile, the other end of the cylinder operation link 703 is hooked on a predetermined portion of the main body 300, so that the first restriction surface 703a for limiting the upward adjustment range of the height adjustment cam 703a And the other end of the cylinder operation link 703 is engaged with a predetermined portion of the main body 300 to limit the downward adjustment range of the height adjustment cam 703a, 2 restricting surface 703-2 can be formed. By this configuration, excessive rotation of the cylinder lever 701 can be prevented.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

11: upper cover 13: lower cover
21: seat plate 23: back plate
30: gas cylinder 31: opening / closing pin
100: a seat plate engaging portion 110, 120, 110 ', 120': a base plate bracket
110'h, 120'h: coupling hole 111, 121: vertical surface
113, 123: horizontal plane 113a: front and rear determination grooves
113h, 123h: long hole slot 200: link portion
211: forward link 211b-1: stopper projection
213: front first link shaft 215, 224: anti-twist pipe
217: forward second link shaft 221: rear link
222: rotating shaft 223: rear first link shaft
225: rear second link shaft 300: main body portion
301: extension for linkage 303: stopper contact surface
400: back plate coupling part 500: elastic force supplying part
601: Limit operating range 603: Limit lever range
605: Limit operation lever 605a: Limit operation cam plate
605b: connecting rod 701: cylinder lever
703: cylinder operation connecting rod 703a: cam for height adjustment
703-1: first limiting surface 703-2: second limiting surface
705: Cylinder operation stand H: Stop hole
H1, H2, H3, H4: step adjustment grooves h1, h2, h3, h4: tilting step groove

Claims (21)

A seat plate engaging portion coupled to the seat plate;
A main body part connected to a lower portion of the seat plate engaging part through a link part;
A back plate engaging part coupled to the link part on one side to rotate in conjunction with a linking operation of the link part, and a back plate coupled to the other side to tilt the back plate in a forward and backward direction; And
And an elastic force providing unit for applying an elastic force to the link unit to maintain the back plate in a forwardly tilted state,
Wherein,
And a second link portion that is hinge-connected at one end to the front side of the seat plate engaging portion and at the other end to be hinged to the front side of the main body portion, ; And a second link part connected to the rear side of the main body part so as to be rotatable about a center of the main body part, the second link part having one end extended forward and hinged to the rear side of the seat connection part,
The elastic force-
A spring holder rear portion having one end mounted on a front inner lower surface of the main body portion; A spring holder front having one end mounted on a portion of the second link portion and the other end being retractably inserted into the inside of the spring holder rear; And an elastic spring mounted between the spring holder rear and the spring holder front to provide an elastic force, wherein one end of the spring holder rear is formed with a pair of semicircular grooves extending in the vertical direction, A pair of semicircular grooves are formed between the pair of semicircular grooves, a pair of semicircular protrusions are formed on the front inner lower surface of the main body portion corresponding to the pair of semicircular grooves so as to extend in the vertical direction, And a pair of semicircular protrusions are inserted and hooked to the pair of semicircular grooves, and the spherical protrusions are inserted into the spherical grooves to be engaged with the semicircular grooves, And one end of the spring holder front is formed to have a hook shape so that the spring holder can be pivoted in the lower part of the main body part Wherein the first and second link shafts are spaced apart from each other so as to be engaged with a rear second link shaft provided to cross both sides. delete The method according to claim 1,
And the other end of the second link portion extends toward a front lower side of the main body portion. The method according to claim 1,
And the central portion of the second link portion is rotatable through a rotation shaft passing through a rear side of the main body portion. 5. The method of claim 4,
And the second link part includes a pair of rear links provided on both sides of the rear side of the seat plate engaging part so that the second shaft part can rotate on both sides of the rotation shaft. 6. The method of claim 5,
Wherein one end of the pair of rear links is hingedly connected through a rear first link shaft provided to cross both sides of the rear plate of the seat plate engaging portion. The method according to claim 6,
And a torsion preventing pipe is coaxially inserted into the outer side of the rear first link shaft. 6. The method of claim 5,
And the other end of the pair of rear links is hingedly connected through the rear second link shaft. The method according to claim 1,
Wherein the first link portion includes:
And a pair of front links for hinge-connecting the front both sides of the left-hand plate engaging part and the front both sides of the main body part. 10. The method of claim 9,
Wherein one end of the pair of front links is hingedly connected through a front first link shaft passing through both front sides of the seat plate engaging portion. 11. The method of claim 10,
And a torsion preventing pipe is coaxially inserted into the outer side of the front first link shaft. 11. The method of claim 10,
And the other ends of the pair of front links are hingedly connected through a front second link shaft passing through both front upper portions of the main body portion. The method according to claim 1,
Wherein the seat-
And a pair of bottom plate brackets provided on both sides of the lower portion of the seat plate. 5. The method of claim 4,
Wherein one end of the elastic force providing part is supported inside the front side of the main body part, and the other end of the elastic force providing part is supported on the rotating shaft. 5. The method of claim 4,
And a limit operating base provided in the main body so as to be rotatable about an axis parallel to the rotating shaft, wherein the plurality of tilting step recesses are formed in a circumferential shape so as to have different radii,
And the tilting angle of the back plate coupling portion is limited in a stepwise manner as the rotation shaft is engaged with any one of the plurality of tilting step grooves of the limit operation base. 16. The method of claim 15,
The limit actuating bar is axially coupled to a limit lever bar that is axially inserted so as to extend outward from one side of the main body,
And a limit operation lever fixedly coupled to the outside of the limit lever bar and having a cam for limit operation formed at an end thereof,
The limit actuating bar has a connecting rod penetrating the main body portion to be connected to the limit actuating cam piece, and the plurality of tilting step grooves are formed in the other extending portion of the limit actuating bar,
Wherein a stop hole is formed in a corresponding portion of the main body portion through which the connecting rod penetrates, the stop hole having a plurality of step adjusting grooves for selectively connecting the connecting rod. 5. The method of claim 4,
A cylinder lever axially inserted to extend outside the other side of the main body portion;
A cylinder operation link formed on one side with a cam member for height adjustment and coaxially fixedly coupled to an end of the cylinder lever; And
A cylinder operating rod installed on the rotating shaft so as to be seesawed and capable of adjusting the height of the gas cylinder by pressing the opening and closing pins of the gas cylinder on the other side as the one side is raised and lowered by the height adjusting cam; The chair assembly comprising: 18. The method of claim 17,
A first limiting surface is formed at one end of the cylinder operation connecting rod to limit an upward adjustment range of the height adjusting cam member as it is caught by a predetermined portion of the main body portion, And a second restricting surface for restricting a downward adjustment range of the height adjusting cam member when the second restricting surface is hooked on a predetermined portion of the main body. The method according to claim 1,
Wherein a long slot is formed along the forward and backward direction at a joint portion of the seat plate engaging portion coupled to a lower portion of the seat plate and a plurality of front and rear determination grooves are formed at one side of the seat plate engaging portion along the forming direction of the slot. assembly. delete delete

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