JP2747190B2 - 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. 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.

[0003]

However, in such a conventional technique, in order to enhance the cushioning property, in addition to the formed wire stretched in the frame-shaped wire, the wire is resiliently attached to the frame. Conical coil spring to support,
Since a relatively large and bulky part such as an S-spring curved in a bow shape is required separately, there is a problem that the number of large parts is large, the assembling work is complicated, and the cost is increased.

[0004] In addition, the place where a large component such as a conical coil spring or an S-spring is attached separately from the formed wire is limited to a narrow space between the frame and the wire. There is a possibility that the degree of freedom in shape and shape is poor, and a structure having a necessary spring feeling cannot be freely designed.

The present invention has been made in view of such conventional problems, and can reduce the number of large parts and the number of assembling steps, thereby reducing the cost and the extra mounting space. It is an object of the present invention to provide a seat spring structure that can adjust an arbitrary portion to a required spring feeling without requiring it.

[0006]

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 resilient portions (33, 43, 5) which extend in parallel with (2) and further bend and extend obliquely downward toward the outside of the outer frame wire (60).
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 resilient portions (33, 4) of at least one formed wire (30, 40, 50) are provided.
3, 53) is provided with an auxiliary spring member (80) for increasing or reducing the resilient force that can be generated by the resilient portion (30, 40, 50) and arbitrarily adjusting the resilient force. The present invention resides in a seat spring structure (10).

[0007]

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, and the resilient portions (33, 4).
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).
If a plurality of 0) are arranged side by side at predetermined intervals, a sufficient spring feeling can be obtained without using a relatively large and bulky auxiliary part such as a conical coil, and a cushion optimal for a portion required for sitting comfort is provided. It can have sex.

Further, the formed wire (30, 40, 5)
In order to arbitrarily adjust the resilient force that can be generated by the resilient portions (33, 43, 53) of (0), an auxiliary spring member (80) having a predetermined spring constant is attached to the resilient portions (33, 43, 53). 53)
, The resilience of the resilient portions (33, 43, 53) itself can be increased or reduced.

Accordingly, the formed wire (30, 4)
(0, 50), without changing a dedicated type, and without separately attaching a bulky conical coil spring or the like, it is possible to appropriately adjust a necessary portion to a desired spring feeling.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 show one 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.
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 material 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 square shape so as to correspond to the base frame 20, and the width of the front half of the outer side wire 60 in both sides 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 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. 1, the formed wire 30 disposed at the forefront is developed in both directions along the surface surrounded by the outer frame wire 60, and a pad (not shown) is placed thereon. A support receiving portion, an upper fixing portion extending from both ends of the support receiving portion and overlapping with the outer frame wire, and fixed to both sides of a front end of the outer frame wire; And a front end 2 of the base frame 20 which is connected to a lower end of the elastic portion 33 and serves as a spring.
And a lower fixing portion 34 fixed to the bottom portion on both sides.

More specifically, the resilient portion 33 includes
The first inclined bar 33a is bent obliquely downward from both ends of the upper fixing portion 32 toward the inside of the outer frame wire 60 (the rear side from the front end 61), and at a substantially intermediate position between the outer frame wire 60 and the base frame 20. A torsion bar 33b extending parallel to the upper fixing portion 32 and an outer side of the outer frame wire 60 (a front end 61).
2) and a second inclined bar 33c extending obliquely downward toward the side).

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 foremost 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.

Thus, 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 configured as a spring that can be elastically displaced further downward separately from the elastic portion 43. In addition, the lower fixing portion 44 is connected to the side end 22 of the base frame 20.
It is fixed to the bottom part of.

The second formed wire 40 from the front end
The remaining three formed wires 50 following the back of the head have the same shape as each other, and their basic constituent parts are a support receiving part 51, an upper fixing part 52, and a resilient part 53, as shown in FIG.
(Consisting of the first inclined bar 53a, the torsion bar 53b, and the second inclined bar 53c), and the lower fixing portion 54.

The formed wire 50 has an upper fixed portion 52 in that the span between the upper fixed portion 52 and the torsion bar 53b is short so that the upper fixed 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.

As shown in FIG. 1, the resilient portions 53, 53... Of the two rear formed wires 50, 50 reduce the resilient force that the resilient portions 53 can generate. An auxiliary spring member 80 for adjusting the elastic force to be weaker is provided. As shown in FIGS. 3 and 5, the auxiliary spring member 80 includes a first inclined bar 53a and a second inclined bar 53 around a torsion bar 53b constituting the resilient portion 53 as a torsion center.
and c are urged in the direction of contraction by bringing them closer to each other.

The auxiliary spring member 80 that adjusts the elastic force of the elastic portion 53 to weaken the elastic force of the formed wire 5
This is effective when the material of No. 0 is hard and the spring feeling of the resilient portion 53 is insufficient. That is, the formed wire 5
The cushioning property of the resilient portion 53 can be increased without lowering the rigidity and durability of the elastic portion 53.

More specifically, as shown in FIGS. 2 and 3, the auxiliary spring member 80 includes a torsion bar 53b.
, A first end portion 82 extending from one end of the coil portion 81 along the first inclined bar 53a, and another end portion 83 extending from the other end of the coil portion 81 along the second inclined bar 53c. Become. One end 82 and the other end 83 have a first inclined bar 53a and a second inclined bar 53b, respectively.
Hooks 82a and 83a are provided for locking the hooks.

As shown in FIG. 4, the torsion bar 53b
Is previously covered with a tube 84 made of a soft resin.
The tube 84 is for preventing generation of abnormal noise due to collision between the torsion bar 53b and the coil portion 82. However, a resin coating may be applied to the torsion bar 53b instead of the tube 84. In addition,
One end 82 and the other end 83 of the auxiliary spring member 80 are coated with resin on the hooks 82a and 83a.

As shown in FIG. 1, a reinforcing wire 70 is separately provided on the outer frame wire 60. Reinforcing wire 70
Are formed on both sides of the rear end 63 of the outer frame wire 60 and the pad shape retaining portion 72 extending in the front-rear direction outside the recesses 62b, 62b on both sides of the outer frame wire 60 and holding a pad side portion (not shown). It has a double fixing portion 71 for fastening. The front end of the pad shape retaining portion 72 is connected to the side projection 62 of the outer frame wire 60.
a and the side concave portion 62b is fixed by the fixing clip 1.

An intermediate portion between both ends of the rear end 63 of the outer frame wire 60 is bent in a substantially 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 the support receiving portion 51 of the formed wire 50 at the rearmost end and fixed by the fixing clip 1.

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.

From the front end to the rear end between the base frame 20 and the outer frame wire 60, a plurality of the formed wires 30, 40, 50 are arranged at predetermined intervals. 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, each of the formed wires 4
0, 50, the upper fixing portions 42, 52
Are fixed to both ends 62, 62 of the outer frame wire 60 parallel thereto, and the lower fixing portions 44, 54 are fixed to the bottom surfaces of the both ends 22, 22 of the base frame 20 parallel thereto. I do.

As a result, the formed wires 30 and 4 expanded in both directions in the frame of the outer frame wire 60.
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.
Thereby, a sufficient spring feeling can be obtained.

Also, as shown in FIG. 1, by providing auxiliary spring members 80 at the resilient portions 53 of the two rear formed wires 50 located at the rear of the seat, for example, a specific portion ( In the case of this embodiment, adjustment can be made so as to reduce the resilience of the resilient portion 53 itself at the rear portion of the seat).

As shown in FIG. 1, each of the resilient portions 53, 53... Of the two rear formed wires 50, 50 reduces the resilient force that the resilient portion 53 can generate. An auxiliary spring member 80 for adjusting the elastic force to be weaker is provided. That is, as shown in FIGS. 3 and 5, the auxiliary spring member 80 is
The first inclined bar 53a and the second inclined bar 53c are urged toward each other with the b being the center of torsion so as to be close to each other.

Therefore, when the material of the formed wire 50 is hard, the elasticity of the resilient portion 53 is inherently somewhat insufficient, and the support receiving portion 51 is hardly displaced downward when receiving a load. However, since the resilient portion 53 is easily closed and contracted by the urging force of the auxiliary spring member 80, the spring feeling can be enhanced. Thereby, the formed wires 30, 40, 50
Necessary parts can be adjusted to a desired spring feeling without changing the dedicated type of the above or reducing its rigidity and durability, and it is possible to give optimal cushioning to the necessary parts for sitting comfort. .

FIG. 6 shows a modification of the auxiliary spring member 80. The auxiliary spring member 80a according to this modification is the same as the auxiliary spring member 80 as a member. However, as shown in FIG. 6, the auxiliary spring member 80a has a first torsion bar 53a and a second Inclined bar 5
3c so as to be urged in a direction in which they are spread apart from each other.

That is, the auxiliary spring member 80a is for adjusting the resilient force generated by the resilient portion 53 so as to increase the resilient force. As described above, the auxiliary spring member 80a for adjusting the resilient force of the resilient portion 53 is a bulky conical coil spring or the like for increasing resilient force when the material of the formed wire 50 is relatively soft. Without intervening between the formed wire 50 and the base frame 20, the rigidity and durability can be improved.

In this embodiment, the auxiliary spring members are provided only at the respective elastic portions of the rear two formed wires. However, if necessary, the auxiliary spring members may be elastically formed by other formed wires. It may be provided in the unit.

[0039]

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 bulky components such as conical coil springs, the number of parts and the number of assembly steps can be reduced, reducing costs.Also, a sufficient spring feeling can be obtained with only a formed wire, which is necessary for sitting comfort. Optimum cushioning properties can be imparted to various parts.

Further, by providing an auxiliary spring member at the resilient portion of the formed wire, the resilience of the resilient portion itself can be increased or reduced, so that the dedicated type of the formed wire can be changed, Necessary portions can be appropriately adjusted to a desired spring feeling without separately interposing a bulky conical coil spring or the like between the formed wire and the base frame.

[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 perspective view showing one formed wire constituting the spring structure for a seat according to one embodiment of the present invention.

FIG. 3 is an essential part perspective view showing a state in which an auxiliary spring member is provided in a resilient portion of one formed wire constituting the spring structure for a seat according to one embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a state in which an auxiliary spring member is provided in a resilient portion of one formed wire constituting the spring structure for a seat according to one embodiment of the present invention.

FIG. 5 is a view taken along line V in FIG. 2;

FIG. 6 is a front view of a main part showing a modification of the auxiliary spring member.

[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 fixed part 80, 80a ... Auxiliary spring member

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 bends again at a substantially intermediate position between the frame wire and the base frame, extends in parallel with the upper fixing portion, and further bends and extends obliquely downward toward the outside of the outer frame wire; Connects to the lower end and fastens to the base frame A plurality of the formed wires arranged at predetermined intervals from a front end side to a rear end side between the base frame and the outer frame wire; A spring structure for a seat, wherein the spring portion is provided with an auxiliary spring member that enhances or reduces an elastic force generated by the elastic portion and arbitrarily adjusts the elastic force.