JP3978057B2 - Resin seat frame support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a resin seat frame, and more particularly to a support structure for a seat frame in a seat cushion configured by disposing a cushion pad on a resin seat frame.
[0002]
[Prior art]
In conventional automobile seats, a cushion pad made of foamed synthetic resin with a large thickness is placed on a steel plate frame to ensure a good seating comfort for the seated person, and the surface is covered with an exterior material. What has been configured is widely used.
[0003]
However, in recent years, in order to solve environmental problems, there has been a strong demand for reducing the weight and size of automobiles, and accordingly, the automobile seats are also required to be reduced in weight and thickness. However, in the combination of the steel plate frame and the cushion pad as described above, it is difficult to make the cushion pad thin because the steel plate frame is heavy and has rigidity, so long as the importance of ensuring the seating comfort is important, There were limits to weight and thickness reduction even with various measures.
[0004]
In order to solve such a problem, the applicant previously disclosed in Japanese Patent Application No. 2001-229984, as shown in FIG. 6, an upper surface plate 22 constituting a seating support surface and a peripheral surface plate 23 depending downward from the peripheral edge thereof. Are formed integrally, and at least one pair of concave groove portions 24 that are continuous between the upper surface plate 22 and the peripheral surface plate 23 are provided at opposite positions on both sides of the upper surface plate 22. A frame 21 is proposed. Further, as shown in FIG. 7, the seat frame 21 is configured to fasten and fix the mounting portions 25 provided in the vicinity of the four corners to the support portions 26 provided in the seat rail device.
[0005]
According to such a configuration, when a seated person's load is applied on the upper surface plate 22 via the cushion pad as shown by the white arrow in FIG. 7, the load is attached via the upper surface plate 22 and the peripheral surface plate 23. The concave groove portion 24 that is transmitted to the portion 25 and supported by the support portion 26 and formed continuously from the upper surface plate 22 to the peripheral surface plate 23 on both sides of the upper surface plate 22 is added to the upper surface plate 22. By being deformed smoothly without the risk of permanent deformation or cracking due to the load from the upper surface, the upper surface plate 22 is elastically displaced downward as indicated by a broken line in FIG. 7, and the seated person can be elastically supported.
[0006]
[Problems to be solved by the invention]
However, in the resin-made seat frame 21 in which the seat is made to bend by the load of the person seated as described above to obtain cushioning properties, for example, when the passenger gets on the seat roughly, or when the front passenger collides, When a submarine load generated by moving forward while sinking is applied, if a load exceeding the limit is applied, the seat frame 21 may be greatly bent and cracked as shown by the phantom line in FIG. There is a problem that it cannot be said that there is no risk of damage. Therefore, when a resin material having high rigidity and strength is used, the cushioning property is deteriorated.
[0007]
In view of the above-described conventional problems, an object of the present invention is to provide a support structure for a resin sheet frame that is not damaged even when an excessive load is applied while ensuring cushioning properties.
[0008]
[Means for Solving the Problems]
The support structure of the resin seat frame of the present invention is provided on the support portion provided on the upper rail of the seat rail device with mounting portions provided in the vicinity of the four corners of the resin seat frame that is bent by the load of a person seated on the seat. In the support structure of the resin seat frame to be placed and supported, the seat frame is formed in a box shape having almost no bottom surface, and the face plate is recessed and formed continuously from the upper surface to the lower end of the side surface at opposite positions on both sides. a longitudinal groove formed by at least a pair provided configuration, the upper rail, a receiving surface to receive a lower surface of the groove forming portion of the seat frame at a proper spacing between the lower end of the seat frame disposed, Ru der those excessive load on the seat frame has been into contact with the lower surface receiving surface of the groove forming portion of the seat frame when acting.
[0009]
According to the above configuration of the present invention, without impairing the cushioning properties of the seat frame, without adding new parts, or using an expensive resin material having both flexibility and strength, at low cost. Damage to the seat frame can be reliably prevented. Further, the large amount of deflection without fear crack or the like is easily obtained a high cushioning property obtained by longitudinal recessed groove formed by recessing a surface shaped plate, by receiving a portion of greatest deformation It can reliably prevent damage.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a support structure for a resin sheet frame in an automobile seat of the present invention will be described with reference to FIGS.
[0011]
In FIG. 1, reference numeral 1 denotes a resin seat frame of a seat cushion, in which a top surface plate 2 constituting a seating support surface and a peripheral surface plate 3 hanging downward from the peripheral edge thereof are integrally formed, and a box shape having substantially no bottom surface. It is configured. A plurality of pairs (three pairs in the illustrated example) of concave groove portions 4 that are continuous between the upper surface plate 2 and the peripheral surface plate 3 are formed at positions facing each other on both sides of the rear portion of the upper surface plate 2 at appropriate intervals in the front-rear direction. Yes.
[0012]
Each concave groove portion 4 is formed by recessing the face plate of the seat frame 1, and as shown in FIG. 2, the groove bottom portion 4 a is in the vicinity of the inner side of the lower end of the peripheral plate 3 from the intersection with the upper surface plate 2. And is formed so as to have a substantially inverted trapezoidal shape with the groove bottom portion 4a as a hypotenuse and the peripheral plate 3 as a side in a front view.
[0013]
As shown in detail in FIG. 3 in the vicinity of the front side corners and the rear side corners of the seat frame 1, there are bottomed hollow conical mounting portions 5 whose diameter decreases downward, respectively. The nut member 6 is integrally fixed to the bottom by insert molding.
[0014]
7a and 7b are left and right seat rail devices, which are respectively composed of lower rails 8a and 8b and upper rails 9a and 9b. Lower rails 8a and 8b are fixedly installed on the floor of the passenger compartment. Support portions 10 for installing seat cushions are provided at the front and rear portions of the upper rails 9a and 9b, and the mounting portion 5 of the seat frame 1 is placed on the support portion 10 as shown in FIGS. The seat frame 1 is installed in the seat rail devices 7a and 7b by passing the mounting bolts 11 through the mounting holes 10a formed in the support portion 10 and screwing the mounting bolts 11 into the nut members 6 and fastening them.
[0015]
A state in which an appropriate interval is provided between the lower end of the seat frame 1 so that the upper rails 9a and 9b are positioned at or near the positions corresponding to the recessed groove portions 4 on both sides of the seat frame 1 in the middle portion in the front-rear direction. The seat frame receiving surface 12 is provided so that when the seat frame 1 is bent downward by a certain amount or more, the lower end of the seat frame 1 is in contact with and supported by the receiving surface 12.
[0016]
13 is a pivotal support portion of the seat back provided at the rear end portion of the upper rails 9a, 9b of each seat rail device 7a, 7b, and 14 is a seat back provided at the upper rail 9a of one seat rail device 7a. It is a reclining mechanism attachment part.
[0017]
According to such a configuration, when a seated person's load is applied to the upper surface plate 2 of the resin seat frame 1 via the cushion pad (not shown), the load is transmitted via the upper surface plate 2 and the peripheral surface plate 3. It is transmitted to the mounting portion 5 near the four corners and supported by the seat rail devices 7a and 7b via the support portion 10.
[0018]
At this time, the seat frame 1 has a box shape having substantially no bottom surface, and a plurality of concave groove portions 4 continuous from the upper surface plate 2 to the peripheral surface plate 3 are provided at opposite positions on both sides thereof. 2, the concave groove portions 4 formed on both sides of the rear portion of the top plate 2 have a narrow upper groove interval as shown in FIG. 2B from the state of FIG. The upper surface plate 2 and the peripheral surface plate 3 are elastically bent downward and the upper surface plate 2 is elastically displaced downward.
[0019]
In addition, since the face frame of the seat frame 1 is continuous in each concave groove portion 4, there is little possibility of permanent deformation or cracking due to stress concentration on the notch portion even when a repeated load is applied, and there is a problem in strength. This can be eliminated, and a larger amount of bending can be obtained without fear of causing a crack or the like in the seat frame 1.
[0020]
Further, since the recessed groove portion 4 is formed in an inverted trapezoidal shape when viewed from the front, it is possible to easily perform die-cutting when the seat frame 1 is injection molded, and the upper plate 2 and the peripheral plate 3 having high rigidity. Since the depth of the concave groove portion 4 is increased at the corner portion, the deformation becomes easier and sufficient bending can be reliably obtained.
[0021]
Thus, a seat cushion having sufficient cushioning properties can be obtained even in a compact configuration in combination with a cushion pad having a small thickness.
[0022]
On the other hand, when an excessive load is applied to the seat frame 1 when, for example, the vehicle gets on the seat roughly, or when a submarine load is generated when the occupant moves forward while sinking due to inertial force during a frontal collision In this case, the seat frame 1 is greatly bent beyond the limit due to the cushioning property described above, but before the fear that the seat frame 1 is cracked or broken, as shown by a virtual line in FIG. A part of the seat frame 1 is supported in contact with the receiving surface 12 and can be reliably prevented from being further bent and cracked or broken. In particular, since the receiving surface 12 is disposed so as to receive the formation portion of the concave groove portion 4 or the vicinity thereof, the seat frame 1 can be reliably prevented from being damaged by receiving the most deformed portion.
[0023]
Therefore, the seat frame 1 can be damaged at low cost without impairing the cushioning property of the seat frame 1, without adding new parts or using an expensive resin material having both flexibility and strength. It can be surely prevented.
[0024]
In the description of the above embodiment, the example in which the attachment portion 5 and the support portion 10 are simply fastened and fixed has been shown. However, as shown in FIG. 5, the attachment portion is provided with the stepped bolt 16 with the elastic member 15 interposed. A configuration may be adopted in which 5 is fastened and fixed. In FIG. 5, a stepped bolt 16 comprises a head portion 16a, a shaft portion 16b having a diameter larger than the screw diameter, and a screw portion 16c. The shaft portion 16b is formed by the thickness of the support portion 10 and the elastic member 15 in an elastically deformable state. It has a length equal to the sum of the thicknesses. The shaft portion 16b of the stepped bolt 16 is passed through the mounting hole 10a having a slightly larger diameter than the shaft portion 16b formed in the support portion 10 and the elastic member 15, and the screw portion 16c is screwed and fastened to the nut member 6. The step portion between the shaft portion 16 b and the screw portion 16 c is pressed against the nut member 6.
[0025]
If comprised in this way, the attachment part 5 of the seat frame 1 can be supported so that tilting is possible, and when the load acted and the seat frame 1 bent down, the rotation moment acted on the attachment part 5 of the seat frame 1 At times, the mounting portion 5 can be easily tilted to increase the amount of bending of the seating portion without causing excessive stress or distortion in each portion of the seat frame 1, and as described above, the limit of the amount of bending is received. 12, even if an inexpensive and relatively high-rigidity resin material is used for the seat frame 1, a desired flexure can be easily secured without fear of cracks and the like, and the seat frame 1 is comfortable to sit on. Can be obtained.
[0026]
In FIG. 5, the elastic member 15 is interposed between the head portion 16 a of the stepped bolt 16 and the support portion 10, and the bottom surface of the mounting portion 5 is brought into contact with the support portion 10. The head 16 a may be brought into contact with the support portion 10, and the elastic member 15 may be interposed between the support portion 10 and the bottom surface of the attachment portion 5. The elastic member 15 is not limited to the illustrated spring washer, and a disc spring, a coil spring, a rubber ring, or the like can be used.
[0027]
【The invention's effect】
According to the support structure of the resin sheet frame of the present invention, the seat frame is formed in a box shape having substantially no bottom surface as described above, and the face plate is continuously formed from the upper surface to the lower end of the side surface at opposite positions on both sides thereof. and at least one pair provided configuration a longitudinal groove formed by recess formed in the upper rail, to receive the lower surface of the groove forming portion of the seat frame at a proper spacing between the lower end of the seat frame disposed receiving surface, since the excessive load on the seat frame has been into contact with the lower surface receiving surface of the groove forming portion of the seat frame when acting, without impairing the cushioning properties of the seat frame and a new Without adding parts or using expensive resin materials that combine flexibility and strength, it is possible to reliably prevent damage to the seat frame at a low cost. , Also with a large amount of deflection without fear crack or the like is easily obtained a high cushioning property obtained by longitudinal grooves formed by recessing a surface shaped plate, by receiving a portion of greatest deformation It can reliably prevent damage.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of a support structure for a resin sheet frame of the present invention.
2A and 2B show details of a recessed groove portion in the seat frame of the embodiment, where FIG. 2A is a perspective view in a normal state, and FIG. 2B is a perspective view in a bent state.
3 is a cross-sectional view taken along the line AA of FIG. 1 showing an exploded configuration of the seat frame according to the embodiment.
FIG. 4 is a side view of the same embodiment.
5A and 5B show a mounting configuration in a modified configuration example of the embodiment, wherein FIG. 5A is a cross-sectional view taken along the line AA in FIG. 1 and FIG. 5B is a cross-sectional view illustrating a disassembled state.
FIG. 6 is a perspective view of a conventional resin sheet frame.
FIG. 7 is an explanatory diagram of a bending state of the resin sheet frame due to a seating load in a state in which the mounting portion of the resin sheet frame is supported by the support portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat frame 4 Concave groove part 5 Attachment part 7a, 7b Seat rail apparatus 9a, 9b Upper rail 10 Support part 12 Receiving surface

Claims (1)

Resin seat frame support for mounting and supporting mounting portions provided in the vicinity of the four corners of a resin seat frame that bends under the load of a person seated on the seat on a support portion provided on the upper rail of the seat rail device In the structure, the seat frame has a box shape having substantially no bottom surface, and a vertical groove formed by recessing the face plate continuously from the upper surface to the lower end of the side surface at opposite locations on both sides. at least a pair provided configuration, the upper rail, and disposed receiving surface to receive a lower surface of the groove forming portion of the seat frame at a proper spacing between the lower end of the seat frame, an excessive load on the seat frame A support structure for a resin sheet frame, wherein the lower surface of the groove forming portion of the seat frame abuts against the receiving surface when acted.

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