JPH0658757U - Sheet spring structure - Google Patents

Abstract

(57) [Abstract] [Purpose] In a seat having a planar spring, it is possible to suppress the deformation of the seat surface shape at the time of sitting with a simple and inexpensive structure. [Structure] A planar spring 12 is formed by mounting and fixing a support plate 20 having rigidity higher than that of the cross wire between the left and right side wires 12a of the removed portion of the cross wire 12b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet-like spring structure of a seat which is formed in a substantially plane shape and is elastically supported in a seat frame as a receiving surface of a cushion body of the seat.

[0002]

[Prior art]

 For example, seat cushions and seat backs having a structure in which a planar spring called a pluma flex or the like receives a cushion body are known as seats for automobiles and the like.

The planar spring (pullmaflex) is provided with, for example, at least a pair of left and right side wires extending along the frames on the left and right sides of the seat in a shape corresponding to the seat surface of the seat. Then, a plurality of cross wires, which are separated by a predetermined distance in the axial direction of the side wires, are installed and stretched between the left and right side wires to form a comb-shaped planar spring that receives the cushion body of the seat almost on its surface. There is.

Such a planar spring is, for example, a tension coil spring or the like which is arranged in a substantially rectangular seat frame as a receiving surface of a cushion body of a seat and is stretched between the seat frame and the seat frame. It is elastically supported under a specific tension by a plurality of support springs.

[0005]

[Problems to be solved by the device]

 By the way, in the known configuration, the side wire of the planar spring is formed to have a thickness that suppresses deformation, for example, a diameter of about 2.6 mm. On the other hand, since the cross wire is generally formed with a diameter of about 1.2 mm, which is smaller than the wire diameters of the side wire and the support spring, the rigidity of the cross wire depends on the bias force of the side wire and the support spring. Lower than.

That is, in such a general plane spring, since the rigidity of the cross wire is low, when a load from a seated person acts on the plane spring via the cushion body, for example, the extension of the support spring First, the cross wire is bent. Therefore, it is unavoidable that the plane spring is bent or deformed in the axial direction of the cross wire, that is, in the approaching direction of the side wire.

The plane spring is usually bent so as to hold the seated person's back in a predetermined shape and to support the lumbar portion of the seated person under a predetermined supporting force. However, if the seat shape of the seat collapses due to sitting, the effects such as maintaining the sitting posture and imparting lumbar support cannot be obtained sufficiently, which may reduce the comfort and safety of the seated person. , Not preferable.

[0008] Here, there is known a configuration in which the seat surface shape is held substantially constant by a resin plate-shaped so-called resin plummer in which deformation in the left and right side directions is suppressed. However, since such a resin plummer is expensive and inferior in versatility, it is not easy to use the resin plummer for a sheet.

An object of the present invention is to provide a sheet-like spring structure for a seat that suppresses the deformation of the seat surface shape when seated with a simple and inexpensive structure.

[0010]

[Means for Solving the Problems]

 In order to achieve this object, according to the present invention, at least a part of the cross wire is deleted, and a support plate having rigidity higher than that of the cross wire is erected and fixed between the side wires on the left and right of the part. .

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, in a sheet spring structure 10 for a seat according to the present invention, a sheet spring 12 is elastically supported by a seat frame 14.

The seat frame 14 is, for example, bent and formed into a substantially rectangular shape as a seat back frame that forms the skeleton of the seat back, and is also bent into a substantially corrugated shape corresponding to the shape of the back of the seated person. .

As can be seen from FIG. 2 in addition to FIG. 1, the planar spring 12 having a shape corresponding to the shape of the left and right sides of the seat frame (seat back frame) 14 has a cushion body of the seat back 18 ( It is arranged inside the seat frame so as to serve as a receiving surface (not shown), and is elastically supported by a plurality of support springs 16 such as tension coil springs.

The planar spring 12 is also called, for example, a pluma flex, and includes at least a pair of left and right side wires 12a extending along the left and right sides of the seat frame 14 in a shape corresponding to the seating surface of the seat. A plurality of side wires 12b, which are separated from each other in the axial direction of the side wire 12a by a predetermined distance, are stretched between the left and right side wires to form a comb-shaped planar spring 12.

In the illustrated planar spring 12, a center wire 12c having the same shape as the side wires is arranged substantially at the center between the left and right side wires 12a, and the center wire 12c is arranged in the vertical direction at the central portion of the planar spring. The strength of is reinforced.

Here, as shown in FIG. 1, in the present invention, a part of the cross wire 12b of the planar spring 12 is deleted, and a support plate 20 made of resin, for example, is placed and fixed at the location. Has been done.

As can be seen from FIGS. 2 and 3 in addition to FIG. 1, the support plate 20 is formed to have holding pieces 22 that can be fitted to the side wires 12 a of the left and right sides, respectively. It can be attached to the planar spring 12 by post-processing by fitting it to the.

The support plate 20 is formed, for example, with a comparatively narrow width in the direction corresponding to the axial direction of the side wire 12a, that is, to accommodate the overall bent shape of the planar spring 12. Has been done. Then, for example, the support plate 20 is arranged and fixed at a plurality of positions separated by a predetermined distance in the axial direction of the side wire 12a.

The support plate 20 is formed to have higher rigidity than the cross wire 12b, and is usually arranged at a position corresponding to the lumbar vertebra of the seated person.

Here, as can be seen from FIG. 2, the support plate 20 is formed in a curved shape such that the thickness of the support plate 20 is maximized at the center portion in the left-right direction. With such a configuration, since the rigidity of the central portion of the support plate 20 is increased, the deformation with respect to the load from the seated person is sufficiently suppressed.

For example, assume that the state shown in FIG. 2 is the initial state of the planar spring 12 when there is no load, that is, when the seated person is not seated. Then, when the seated person is seated on the seat and the load from the upper body of the seated person acts on the seat back 18, the load acts on the planar spring 12 via the cushion body of the seat back, and the planar spring is Try to sink it backward, that is, downward in the figure.

However, in this invention, since the support plate 20 made of resin is installed and fixed between the left and right side wires 12a of the planar spring 12, as shown in FIG. While maintaining the original shape under the rigidity of the support plate, the support spring 16 is extended and is sunk substantially in parallel.

Therefore, according to the seat spring structure 10 of the present invention, the seat surface shape of the seat back 18 can be maintained in the predetermined shape formed by the seat spring 12 even when seated, and the seated person's posture can be improved. The collapse is sufficiently prevented. Therefore, the safety and comfort of the seated person when seated can be sufficiently ensured.

Since the support plate 20 having high rigidity is arranged at a position corresponding to the lumbar vertebra of the seated person, the lumbar vertebra of the seated person is accurately pressed and supported under the biasing force of the support spring 16. Therefore, the desired effect of the seat back 18 which is intended to give a predetermined supporting force to the lumbar vertebra of the seated person can be accurately obtained, and also in this respect, the comfort and safety of the seated person can be secured.

Further, since it suffices to fix the support plate 20 to the flat spring 12, it is possible to easily obtain a flat spring having excellent versatility.

Here, in the present invention, the support plate 20 is fixed by fitting to the side frame 12a, but the invention is not limited to this, and the support plate is fixed to the planar spring 12 by other means. It may be configured to.

However, as in the embodiment, the holding pieces 22 that can be fitted to the side wires 12a are provided on the left and right sides of the supporting plate 20, and the supporting plate can be fixed by being fitted to the side wires. If this is the case, the work of attaching the support plate can be simplified, and the workability in the process of assembling the planar spring is improved.

Further, in the embodiment, the support plate 20 is formed so as to maximize the wall thickness at the center portion in the left-right direction. However, the shape of the support plate 20 is not limited to this, as long as the support plate 20 can be erected and fixed between the left and right side wires 12a, and the shape that suppresses easy deformation with respect to the load from the seated person is suppressed. Not done.

However, since the load from the seated person is likely to be concentrated mainly in the central portion in the left-right direction, as shown in the figure, the load is supported in a shape that maximizes the wall thickness in almost the central portions on the left and right sides. If the plate 20 is molded, the support plate 20 that suppresses the deformation of the planar spring 12 can be molded without providing an unnecessary thick portion, and the weight of the support plate itself can be reduced. Also from the point of view, the support plate, that is, the plane spring can be formed at low cost.

With such a curved support plate 20, since the lumbar vertebra of the seated person is accurately pressed by the thick portion of the central portion, the lumbar vertebra of the seated person presses the seated person. The effect of reducing fatigue is further obtained.

Further, the support plate 20 is arranged and fixed at a location corresponding to the lumbar vertebra of the seated person, but the location of the support plate is not limited to this.

However, if the supporting plate 20 is provided at a position corresponding to the lumbar vertebra, both the pressing and supporting of the lumbar vertebra and the suppression of the deformation of the planar spring 12 can be accurately performed only by the supporting plate. The number of support plates can be suppressed sufficiently. Therefore, also in this respect, the structure of the planar spring 12 is simplified, and the planar spring can be provided at low cost.

In the embodiment, the planar spring 12 mounted on the seat back 18 is illustrated, but the invention is not limited to the seat back and the present invention can be applied to a planar spring of a seat cushion. .

Further, a sheet provided with a sheet spring as a receiving surface of the cushion body of the sheet is sufficient, and therefore the sheet is not limited to a sheet of an automobile or the like. For example, a sheet of a train, an airplane, a ship, or a conference room. The invention may be applied to seats of movie theaters and the like.

The above-described embodiments are for explaining the present invention, and do not limit the present invention in any way, and all the modifications and alterations made within the technical scope of the present invention are also applicable. It goes without saying that it is included in the invention.

[0037]

[Effect of device]

 As described above, according to the sheet spring structure of the present invention, the lateral spring rigidity of the sheet spring is secured by the supporting plate fixed and installed between the left and right side wires of the sheet spring. Has been done. Therefore, the seating surface shape of the seat can be maintained in a predetermined shape even when seated, and the seated person's safety and comfort can be sufficiently ensured by preventing the seated person from losing its posture.

Further, it suffices to install and fix the support plate between the side frames of the planar spring, so that the configuration does not become complicated, and the planar spring in which deformation is suppressed can be provided at low cost. At the same time, a planar spring having excellent versatility can be easily obtained.

Further, if holding pieces that can be fitted to the side wires are provided on the left and right sides of the support plate, the support plate can be fixed while being fitted to the side wires, so that the work of attaching the support plate is easy. The workability in the assembly process of the leaf spring is improved.

Further, if a support plate is arranged at a position corresponding to the lumbar vertebra of the seated person, the lumbar vertebra of the seated person is accurately pressed and supported by the biasing force of the support spring. Provides the desired effect of imparting a predetermined supporting force to the lumbar spine of the seated person. Therefore, also in this respect, the comfort and safety of the seated person can be secured.

Further, if the support plate is provided at a position corresponding to the lumbar vertebra, both the pressing of the lumbar vertebra, the support, and the suppression of the deformation of the planar spring can be accurately performed only by the support plate. The number of support plates can be suppressed sufficiently. Therefore, also in this point, the structure of the planar spring can be simplified and the planar spring can be provided at a low cost.

Then, by forming the support plate in a shape that maximizes the wall thickness at the center of the left and right sides, a support plate that suppresses deformation of the planar spring can be provided without providing unnecessary wall thickness portions. Since the support plate itself can be molded, the weight of the support plate itself can be reduced. From this point as well, the support plate can be formed at low cost.

Further, according to such a curved support plate, since the lumbar vertebra of the seated person is accurately pressed by the thick portion of the central portion, the fatigue of the seated person due to the press of the lumbar vertebra of the seated person is increased. Further reduction effect is obtained.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a sheet spring structure of a seat according to the present invention.

2 is a cross-sectional view of the sheet spring structure in the unloaded state of the seat, taken along the line AA in FIG.

FIG. 3 is a partially exploded perspective view of the sheet spring structure of the seat as viewed from the rear.

FIG. 4 is a cross-sectional view of a sheet spring structure similar to FIG. 2 with the seat loaded.

[Explanation of symbols]

 10 Sheet spring structure 12 Sheet spring (pluma flex) 12a Side wire 12b Cross wire 14 Seat frame (seat back frame) 20 Support plate 22 Holding piece

Claims (4)

[Scope of utility model registration request] 1. At least a pair of left and right side wires;
A planar spring structure for a seat, which is formed in a substantially planar shape having a plurality of cross wires stretched between side wires, and is elastically supported in a seat frame as a seat cushion receiving surface of the seat; At least a part of the wire is removed, and a supporting plate having a rigidity higher than that of the cross wire is installed and fixed between the left and right side wires at the location, and a sheet-like spring structure for a seat. 2. The planar spring structure for a seat according to claim 1, wherein the support plate is formed with holding pieces that can be fitted to the side wires on the left and right sides. 3. The planar spring structure for a seat according to claim 1, wherein the position of the support plate in the planar spring of the seat back is at a height corresponding to the lumbar spine of a seated person. 4. The support plate is formed in a curved shape that maximizes the thickness of the center portion in the left-right direction.
2. The sheet spring structure according to any one of 1.