JP2854779B2 - Spring structure for seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame-shaped base frame provided in a vehicle seat or the like typified by a vehicle seat, an outer frame wire spaced above the base frame, and The present invention relates to a seat spring structure including a formed wire interposed between a base frame and an outer frame wire.

[0002]

2. Description of the Related Art A conventional spring structure for a seat of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-265911. That is, a plurality of S springs extending in the front-rear direction are arranged side by side in a substantially square skeleton frame provided inside a seat, and each S spring is crossed by a laterally extending wire separately extending in the skeleton frame and extending in both sides. Stop
Thereby, the lateral displacement between the S springs is prevented. Further, the structure of the vicinity of both ends of the fastening point of each S spring and the horizontal wire is temporarily separated from each other, and then the horizontal wire is bent at a fine pitch so as to intersect with each other. As a result, each S spring is supported from below by a wire.

Another example of a seat spring structure is disclosed in Japanese Patent Application Laid-Open No. 4-325330. That is, a conical coil spring or a bow-shaped S-spring is interposed between a pad supporter formed by stretching a plurality of formed wires in a frame-shaped wire and a frame disposed below the pad supporter. Thereby, the pad supporter is supported with a cushioning property with respect to the frame.

[0004]

However, in the prior art disclosed in Japanese Patent Application Laid-Open No. 1-265911, since the S-springs of the main components have the same pitch, the surface rigidity may be changed depending on the part. In addition to the difficulty, there is a problem that a sufficient spring feeling cannot be obtained, a cushioning property is lacking, and a seating feeling such as riding comfort is impaired. Further, in addition to the plurality of S springs, a horizontal wire for preventing the lateral displacement between the S springs is required, so that the number of parts increases, the number of assembling steps increases, and the cost increases. There was a problem.

On the other hand, in the prior art disclosed in Japanese Patent Application Laid-Open No. Hei 4-325330, a conical coil is used in addition to a plurality of formed wires stretched in a frame-shaped wire in order to provide a feeling of spring and enhance cushioning. Since a spring and an S-spring are required, the number of parts is increased, the number of assembling steps is increased, and the cost is increased, as in the above-described conventional technology.

Further, since the range in which the pad can be placed is within the frame-shaped wire, the range in which the pad can be held depends on the shape of the wire and is extremely limited. However, there is a problem that the pad side portion cannot be received only by the side end of the wire, and the side portion of the pad is deformed so as to hang down.

The present invention has been made in view of such conventional problems, and it is possible to reduce the number of parts and the number of assembling steps, thereby reducing the cost and obtaining a sufficient spring feeling. It is an object of the present invention to provide a seat spring structure capable of enhancing cushioning properties, improving a seating feeling, and particularly capable of sufficiently holding a pad side portion.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a frame-shaped base frame (20) to be installed in a seat and the base frame (2).
An outer frame wire (60) spaced apart from the upper side of (0) and a formed wire (30, 40, 50) interposed between the base frame (20) and the outer frame wire (60). In the seat spring structure (10) provided, the formed wires (30, 40, 50) are formed by bending a wire, and are formed on both sides along a surface surrounded by the outer frame wire (60). Support receiving part (3
1, 41, 51) and the support receiving portions (31, 41, 51)
The upper fixing portions (32, 42, 5) extending from both ends of the outer frame wire (60) so as to overlap with the outer frame wire (60) and fasten to the outer frame wire (60).
2) and, after being bent obliquely downward toward the inside of the outer frame wire (60) from the upper fixing portion (32, 42, 52), a substantially intermediate position between the outer frame wire (60) and the base frame (20). At the upper fixing portion (32, 42, 5).
The outer frame wire (60) which extends in parallel with 2) and further bends
Resilient parts (33, 43, 5) extending diagonally downward toward the outside of the
3) and a lower fixing portion (3) connected to the lower end of the resilient portion (33, 43, 53) and fixed to the base frame (20).
, 44, 54) and the base frame (2
0) and the outer frame wire (60) from the front end side to the rear end side, the formed wire (30, 40, 5).
0) are arranged in parallel at predetermined intervals, and the outer frame wire (6)
0), both ends (62, 62) of the outer frame wire (60).
A reinforcing wire (70) is further provided to protrude further to the side, and the reinforcing wire (70) extends in the front-rear direction while protruding to both sides of the outer frame wire (60), and holds a pad side portion. (72) and a reinforcing fixing part (71) that is overlapped and fixed on both sides of the rear end of the outer frame wire (60). The load receiving portion (64) is formed by bending in a substantially U-shape toward the inside of the outer frame wire (60) to form the load receiving portion (64).
4) is replaced with the formed wire (5
A seat spring structure (10), wherein the spring structure (10) is superposed and fastened to the support receiving portion (51) of (0).

[0009]

According to the present invention, since the formed wire (30, 40, 50) can freely set a bending pitch, a bent shape, and the like, in the present invention, the wire rod is bent, expanded in both directions, and placed on a support receiving pad. (31, 41, 51) and the support receiving part (31, 4).
Resilient portions (33, 43, 53) which are bent into predetermined shapes from both ends of the resilient portions (1, 51) and serve as springs;
3, 53) are formed as dedicated-type formed wires (30, 40, 50) having lower fixing portions (34, 44, 54) connected to the lower end of the base frame (20).

The formed wire (30, 40, 5) extends from the front end to the rear end between the base frame (20) and the outer frame wire (60) disposed above the base frame (20).
0) are arranged side by side at predetermined intervals. Thus, the formed wire (30, 40, 50) can be used without using a plurality of S springs and wires for preventing lateral displacement between the S springs and a conical coil spring that resiliently supports the S springs from below. With only this, it is possible to obtain a sufficient spring feeling and to provide an optimum cushioning property to a part necessary for comfortable sitting.

The outer frame wire (60) is separately provided with a reinforcing wire (70) having a pad shape retaining portion (72) projecting laterally from both side ends (62b, 62b).
As a result, the area on which the pad can be placed is the outer frame wire (6
0), the side of the pad to which a large load is applied at the time of getting on and off, etc. is the side end (62b) of the outer frame wire (60).
Pad shape retaining portion (72) of extended reinforcing wire (70)
Thus, the pad can be sufficiently held, and deformation such that the side portion of the pad hangs down can be prevented. Further, the reinforcing wire (70) has a reinforcing fixing portion (71) which is overlapped and fixed on both sides of the rear end of the outer frame wire (60), and furthermore, a load formed on the outer frame wire (60). The receiving part (64)
The rigidity of the rear spring surface of the spring structure for a seat (10) can be particularly increased because it is fixed to the support receiving portion (51) of the formed wire (50) located at the rearmost end by being superposed.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. As shown in FIG. 1, the seat spring structure 10 includes a frame-shaped base frame 20 that is provided inside a vehicle seat, and an outer frame wire 60 that is spaced above the base frame 20.
It comprises formed wires 30, 40, 50 interposed between the base frame 20 and the outer frame wire 60, and a reinforcing wire 70. In this embodiment, the seat spring structure 10 constitutes a vehicle seat, but may be used for a furniture sofa or the like.

The base frame 20 is formed by solidifying an angle member bent into an L-shaped cross section into a square shape, and includes a front end 21, both side ends 22, 22, and a rear end 23. Each of the ends 21, 22, and 23 has a substantially horizontal bottom surface and an edge standing upright at a substantially right angle from the bottom surface.

The outer frame wire 60 is formed by bending a wire into a substantially quadrangular shape so as to correspond to the base frame 20. The width of the front half of the outer wire 60 in both lateral directions is larger than the width of the base frame 20. The rear frame is formed such that the lateral width in both lateral directions is substantially equal to the lateral width of the base frame 20. The length of the outer frame wire 60 and the length of the base frame 20 in the front-rear direction are substantially equal.

A reinforcing wire 70 is separately provided on the outer frame wire 60. The reinforcing wire 70 extends in the front-rear direction while extending laterally from the recesses 62b, 62b on both sides of the outer frame wire 60, and a pad shape retaining portion 72 that holds a pad side portion (not shown). Reinforcement fixing portions 71, 71 that are overlapped on both sides of the rear end 63 and fastened by the fixing clip 1.
And The front end of the pad shape retaining portion 72 is connected to the outer frame wire 6.
The fixing clip 1 is used to fix the side projection 62a and the side recess 62b.

An intermediate portion between the rear ends 63 of the outer frame wire 60 is bent substantially in a U-shape toward the inside of the outer frame wire 60 to form a load receiving portion 64. The load receiving portion 64 is overlapped with a support receiving portion 51 of the formed wire 50 at the rearmost end, which will be described later, and is fastened by the fixing clip 1. The load receiving portion 64 and the reinforcing fixing portions 71, 7
1 is to increase the rigidity of the rear spring surface of the seat spring structure 10.

A plurality of formed wires 30, 40, 50 are arranged at predetermined intervals from the front end side to the rear end side between the base frame 20 and the outer frame wire 60. The formed wires 30, 40, and 50 are formed by bending a wire material into three types of dedicated molds having slightly different bent shapes and the like.

As shown in FIG. 2 to FIG. 4, as a representative example of the formed wire 30 disposed at the forefront end, the pad is developed in both directions along the surface surrounded by the outer frame wire 60. (Not shown), and a support receiving portion 3
An upper fixing portion 32 extending from both ends of the outer frame wire 60 so as to overlap the front end 61 of the outer frame wire 60, and a bullet which is bent from both ends of the upper fixing portion 32 into a predetermined shape and serves as a spring. A lower fixing portion 34 connected to the lower end of the resilient portion 33 and fixed to the bottom portion on both sides of the front end 21 of the base frame 20 is provided.

More specifically, the resilient portion 33 is located inside the outer frame wire 60 (the front end 61) from both ends of the upper fixing portion 32.
First inclined bar 33 bent obliquely downward toward the rear side)
a, a torsion bar 33b extending in parallel with the upper fixing portion 32 at a substantially intermediate position between the outer frame wire 60 and the base frame 20, and extending obliquely downward toward the outside (the front end 61 side) of the outer frame wire 60. And the second inclined bar 33c are connected to each other.

The upper fixing portion 32 is provided with an outer frame wire 60.
Is fastened firmly by the fixing clip 1 having a substantially C-shaped cross section in a state where the front end 61 is double-fitted with the front end 61. The wires of the outer frame wire 60 and the formed wires 30, 40, 50 are similarly connected to each other in the same manner.
To each other. On the other hand, the lower fixing portion 34 is fixed to the base frame 2 by a predetermined fixing tool (not shown).
0 is fixed to the bottom surface. The same applies to the lower fixing portions 44, 54 of the other formed wires 40, 50.

The formed wire 40 disposed second from the front end has the same basic components as the formed wire 40, such as the support receiving portion 41, the upper fixing portion 42, and the resilient portion 43 (the The first inclined bar 43a, the torsion bar 43b, and the second inclined bar 43c), and the lower fixing portion 4
4, but the bending shape is slightly different from that of the formed wire 30. In other words, the formed wire 40 is such that the upper fixing part 32 and the lower fixing part 34 extend from the outer frame wire 60 at the point where the upper fixing part 42 and the lower fixing part 44 extend in parallel with the side end 62 of the outer frame wire 60. Is different from the formed wire 30 extending in parallel with the front end 61.

Upper fixed part 42 of formed wire 40
Are fixed to side protruding ends 62 a of the side ends 62 of the outer frame wire 60, which are formed particularly wide in width. More specifically, the upper fixing portion 42 of the formed wire 40 extends outward from the side edge 22a of the base frame 20 located below, and the side protruding end 62a of the outer frame wire 60 extends.
It is fixed to.

As a result, the side protruding end 62 of the outer frame wire 60
When a load is applied to the “a” side, a part of the formed wire 40 that is displaced downward is engaged with the side edge 22 a of the base frame 20. With the side edge 22a as a fulcrum, a portion extending from the fulcrum toward the upper fixed portion 42 is formed as a spring that can be elastically displaced further downward separately from the elastic portion 43. The lower fixing portion 44 is fixed to the bottom surface of the side end 22 of the base frame 20.

The second formed wire 40 from the front end
The remaining three formed wires 50 following the back of the wire are the same in shape, and their basic components are the support receiving portion 51 and the upper fixing portion 5 as in the case of the formed wire 40.
2, a resilient portion 53 (comprising a first inclined bar 53a, a torsion bar 53b, and a second inclined bar 53c), and a lower fixing portion 54.

The formed wire 50 has an upper fixing portion 52 in that the span between the upper fixing portion 52 and the torsion bar 53b is short so that the upper fixing portion 52 is located almost directly above the side edge 22a of the base frame 20. The span between the portion 42 and the torsion bar 43b is different from that of the formed wire 40 formed longer. Therefore, the upper fixing portion 52 of the formed wire 50 is fixed to the side concave end 62 b of the side end 62 of the outer frame wire 60, the width of which is substantially equal to that of the base frame 20.

Next, the operation will be described. Unlike the S spring, the formed wire can freely set a bending pitch, a bent shape, and the like. In the present embodiment, the wire is bent as shown in FIG. 40,5
0 is formed. Each of these formed wires 30, 40,
Reference numerals 50 denote support receiving portions 31, 41, and 51 for deploying pads on both sides and placing pads, and supporting receiving portions 31, 41, and 51, respectively.
Resilient portion 3 which is bent into a predetermined shape from both ends of the member and serves as a spring
3, 43, 53, and lower fixing portions 34, which are connected to the lower ends of the resilient portions 33, 43, 53 and fasten to the base frame 20,
44 and 54 are formed.

A plurality of the formed wires 30, 40, 50 are arranged at predetermined intervals from the front end to the rear end between the base frame 20 and the outer frame wire 60. In this case, the upper fixing portion 32 of the foremost formed wire 30
Are fixed to both sides of the front end 61 of the outer frame wire 60 parallel thereto, and the lower fixing portions 34 are fixed to the bottom surfaces of both sides of the front end 21 of the base frame 20 parallel thereto. On the other hand, in each of the formed wires 40 and 50 other than the foremost one, the upper fixing portions 42 and 52 are fixed to both side ends 62 and 62 of the outer frame wire 60 parallel to the formed wires 40 and 50, and are fixed to the lower side. Part 4
4 and 54 are fixed to the bottom surfaces of both side ends 22 and 22 of the base frame 20 parallel to the base frame 20.

Thus, in the frame of the outer frame wire 60, each of the formed wires 30, 4 developed in both directions.
Since the support receiving portions 31, 41, and 51 of 0 and 50 are connected to each other on the same plane in the front-rear direction, it is possible to sufficiently secure the rigidity of the spring surface of the seat spring structure 10 on which the pad (not shown) is placed. it can. Moreover, the spring portions 33, 43, 53 of the formed wires 30, 40, 50 themselves are used without using a conical coil spring or the like that elastically supports the S spring or the like from below.
With only this, it is possible to obtain a sufficient spring feeling and to provide an optimum cushioning property to a part necessary for comfortable sitting.

As shown in FIG. 1, a reinforcing wire 70 is separately provided on the outer frame wire 60. The pad shape retaining portion 72 of the reinforcing wire 70 is formed by the concave portions 62b, 6 on both sides of the outer frame wire 60.
Since the pad extends in the front-rear direction while protruding laterally from 2b, the range in which the pad can be placed is not limited to the inside of the outer frame wire 60. That is, the pad side portion on which a large load is applied at the time of getting on and off is sufficiently held by the pad shape retaining portion 72 extending from the side concave end 62b of the outer frame wire 60, and the pad side portion is prevented from being deformed so as to hang down. be able to. Furthermore,
The reinforcing structure 71 of the reinforcing wire 70 and the load receiving portion 64 of the outer frame wire 60 allow the spring structure 10 particularly for the seat to be used.
The rigidity of the rear spring surface can be increased.

[0030]

According to the spring structure for a seat according to the present invention, a support receiving portion which is developed in both sides and on which a pad is placed,
Since a plurality of formed wires having a resilient portion serving as a spring and a lower fixing portion fixed to the base frame are arranged in parallel at predetermined intervals before and after between the base frame and the outer frame wire, Without using a conical coil spring, etc., the number of parts and the number of assembly steps can be reduced to reduce costs, and a sufficient spring feeling can be obtained only with a formed wire, making it possible to reduce Optimum cushioning can be provided.

In particular, since the reinforcing wire having the pad shape retaining portion for extending the side wire from the side end thereof and holding the side portion of the pad is separately provided on the outer frame wire, the range in which the pad can be placed is as follows. Not limited to the inside of the outer frame wire, the pad side portion on which a large load is applied when getting on and off is sufficiently held by the pad shape retaining portion of the reinforcing wire extending from the side end of the outer frame wire, and the pad side portion hangs down. Such deformation can be prevented. Further, the rigidity of the rear spring surface of the seat spring structure can be particularly increased by the reinforcing fixing portion of the reinforcing wire and the load receiving portion of the outer frame wire.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a spring structure for a seat according to an embodiment of the present invention.

FIG. 2 is a plan view showing a foremost formed wire constituting a spring structure for a seat according to an embodiment of the present invention.

FIG. 3 is a front view showing a frontmost formed wire constituting the spring structure for a seat according to one embodiment of the present invention.

FIG. 4 is a right side view showing a frontmost formed wire constituting the spring structure for a seat according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat spring structure 20 ... Base frame 30, 40, 50 ... Formed wire 31, 41, 51 ... Support receiving part 32, 42, 52 ... Upper fixing part 33, 43, 53 ... Resilient part 34, 43 53, lower fixing portion 60, outer frame wire 70, reinforcing wire 72, pad shape retaining portion

Claims (1)

(57) [Claims] 1. A frame-shaped base frame to be mounted on a seat, an outer frame wire spaced apart above the base frame, and a formed wire interposed between the base frame and the outer frame wire. In the seat spring structure, the formed wire is formed by bending a wire, and is developed in both directions along a surface surrounded by the outer frame wire to support a pad. And an upper fixing portion that extends from both ends of the support receiving portion and overlaps with the outer frame wire and is fixed to the outer frame wire, and is bent obliquely downward toward the inside of the outer frame wire from the upper fixing portion, A resilient portion that is bent again at a substantially intermediate position between the frame wire and the base frame and extends in parallel with the upper fixing portion, and further bent and extends obliquely downward toward the outside of the outer frame wire; Connect to the lower end and fasten to the base frame A plurality of the formed wires are arranged at predetermined intervals from the front end side to the rear end side between the base frame and the outer frame wire. A reinforcing wire that protrudes laterally from both ends of the outer frame wire is separately provided, and the reinforcing wire extends in the front-rear direction in a state of protruding to both sides of the outer frame wire, and a pad shape retaining portion that holds a pad side portion, A reinforcing fixing portion that is overlapped and fixed on both sides of the rear end of the outer frame wire, and a middle portion between the rear ends of the outer frame wire is bent in a substantially U shape toward the inside of the outer frame wire. A load receiving part, and the load receiving part is overlapped and fixed to the support receiving part of the formed wire positioned at the rearmost end.