Vehicle seats

Abstract

To provide a vehicle seat device which enables replacement of a weight and an elastic member for adjusting and changing vibration control characteristics and achieves good mountability of a damper case to a seat.SOLUTION: A dynamic damper D comprises: a damper case 17 formed by first and second case half bodies 17A, 17B which are separably coupled to each other to define a damper chamber 17C; a weight 15 housed in the damper chamber 17C; and an elastic member 16 disposed between the weight 15 and an inner surface of the damper chamber 17C so as to allow vibration of the weight 15. In the damper case 17, attachment parts 24A, 24B which are attached to two positions at left and right sides of a frame 12 of a seat S are formed. The frame 12 is disposed avoiding a portion between an upper surface of the damper case 17 and an inner surface of the seat S facing the upper surface.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an improvement of a vehicle seat, in which a dynamic damper is attached to a frame of the seat installed in a vehicle.

Background Art

[0002] In such a vehicle seat, a dynamic damper constituted by a housing, a weight that is vibratably accommodated in the housing, and an elastic member interposed between the weight and the housing is known as disclosed in Patent Document 1 below.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the dynamic damper in the vehicle seat disclosed in Patent Document 1 above, after the weight and the elastic member are accommodated, the entire housing is integrally formed so that it cannot be disassembled. Therefore, once the dynamic damper is assembled, even when it is necessary to adjust or change the vibration damping characteristics, the weight and the elastic member cannot be replaced with those having different characteristics, and a new dynamic damper has to be manufactured, which is uneconomical. Moreover, since the housing is not provided with an attachment portion to the seat, a special attachment tool such as a band has to be used for attachment to the seat, and the attachment work is also troublesome.

[0005] The present invention Located inside the headrest the center of gravity of the heavy weight of the dynamic damper of is set at a position offset by te Shi one rate in the vertical direction above from the center of the weight By using a relatively small weight, the vibration damping function of the dynamic damper can be enhanced, and the space within the headrest can be effectively utilized to improve the vibration damping function of the dynamic damper. The purpose is to provide seats for vehicles. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides a sheet Headrests are part of the structure In a vehicle seat equipped with a dynamic damper inside, the dynamic damper An elastic sheet that is elastically deformable and forms part of the dynamic damper, and a part of the dynamic damper that is supported by the elastic sheet and whose center of gravity is set to be offset upward in the vertical direction of the sheet relative to its center. weight The damper case, which comprises a damper chamber for housing the weight and the elastic sheet and constitutes a part of the dynamic damper (D), and a cushion member that covers the dynamic damper inside the headrest, The weight is formed in a shape that is asymmetrical in the front and back and asymmetrical in the top and bottom. be This is its first characteristic.

[0007] Furthermore, the present invention is the 1 In addition to the features, the weight is formed such that the thickness in the front-to-back direction and / or the width in the left-to-right direction of the sheet gradually increase upwards. 2 This is a characteristic of this product.

[0008] Furthermore, the present invention also relates to the first or The 2 In addition to any of the above features, the weight is characterized by forming a flattened hexahedron in the front-to-back direction of the sheet. 3 This is a characteristic of this product.

[0009] Furthermore, the present invention also relates to the first to the first 3 In addition to any of the above features, the rear surface of the weight in the front-rear direction of the sheet is formed as a curved surface that protrudes rearward. 4 This is a characteristic of this product.

[0010] Furthermore, the present invention also relates to the first to the first 4 In addition to any of the above features, the dynamic damper has a damper case that constitutes the outer shell and a weight housed inside the damper case, and the damper case is formed by curving the outer shell to conform to the shape of the weight. 5 This is a characteristic of this product.

[0011] Furthermore, the present invention also relates to the first to the first 5 In addition to any of the following characteristics ,beforeThe elastic sheet wraps around the weight so that it overlaps its entire surface, together with the weight. The aforementioned The damper case houses the elastic sheet, which consists of four sheet pieces extending from a rectangular central portion facing the rear surface of the sheet in the front-rear direction of the weight, and the sheet pieces do not cover a portion of the front surface of the sheet in the front-rear direction of the weight. 6 This is a characteristic of this product.

[0012] Furthermore, the present invention also relates to the first to the first 6 In addition to any of the above features, the elastic sheet is interposed in a compressed state between the outer surface of the weight and the inner surface of the damper case which forms the outer shell of the dynamic damper and faces the outer surface. 7 This is a characteristic of this product.

[0013] Furthermore, the present invention also relates to the first to the first 7 In addition to any of the above features, the seat comprises a seat cushion, a seat back, and a headrest, the seat cushion having a seat cushion frame, the seat back having a seat back frame and being reclinedly connected to the seat cushion frame via a pivot, and the headrest comprising a headrest frame and covering the surface of the headrest frame The aforementioned The cushion member and the headrest surface are included. 8 This is a characteristic of this product.

[0014] Furthermore, the present invention also relates to the 8In addition to the features, the seat cushion frame is fixed to the vehicle floor by a plurality of lower support legs, and a pair of left and right brackets protruding upward are connected to the rear end portion of the seat cushion frame. The seat back frame is connected to the brackets via the pivot so as to be reclinable. A pair of left and right support cylinders are fixedly provided at the upper end portion of the seat back frame, and the headrest is supported by the support cylinders so as to be movable up and down and fixed. The headrest is formed by attaching the dynamic damper to the headrest frame. The dynamic damper includes the weight, the elastic sheet wrapping the weight, and the damper case having a damper chamber for accommodating the weight and the elastic sheet. This is the feature of the 9 invention.

Effects of the Invention

[0015] According to the features of the present invention, in a vehicle seat having a seat with a dynamic damper inside the headrest, the The vehicle seat comprises an elastic sheet that is elastically deformable and forms part of a dynamic damper, and a component that is supported by the elastic sheet and also forms part of the dynamic damper, with its center of gravity set to be offset upward in the vertical direction of the seat relative to its center. weight The damper case, which includes a damper chamber for housing the weights and elastic sheet and constitutes part of the dynamic damper, and the cushion member that covers the dynamic damper inside the headrest. is provided, and the weight is , formed in a shape that is asymmetrical in the front and back and asymmetrical in the top and bottom, the center of gravity of the weight of is set at a position offset by te Shi -a certain distance in the up and down direction above from the center of the weight, and a vehicle seat can be configured. Therefore, by using a relatively small weight, the vibration damping function of the dynamic damper can be enhanced, and the space within the headrest can be effectively utilized to improve the vibration damping function of the dynamic damper.

Brief Description of the Drawings

[0016] [Figure 1] Side view of an automobile seat device according to a first embodiment of the present invention. [Figure 2] Enlarged view of part 2 (headrest peripheral part) of FIG. 1. [Figure 3] View taken in the direction of arrow 3 in FIG. 2. [Figure 4] View taken in the direction of arrow 4 in FIG. 2. [Figure 5] Cross-sectional view taken along line 5-5 in FIG. 3. [Figure 6] Perspective view corresponding to FIG. 3. [Figure 7] Exploded perspective view of the dynamic damper in FIG. 6. ​ [Figure 8] Diagram illustrating the molding method for headrest cushioning material using foam. [Figure 9] A front view corresponding to Figure 3, showing a second embodiment of the present invention. [Figure 10] A perspective view of a headrest showing a third embodiment of the present invention. [Figure 11] A perspective view of an automobile seat device showing a first reference embodiment of the present invention. [Figure 12] A perspective view of an automobile seat device showing a second reference embodiment of the present invention. [Figure 13] A perspective view of an automobile seat device showing a third reference embodiment of the present invention. [Modes for carrying out the invention]

[0017] First, the first embodiment of the present invention shown in Figures 1 to 8 will be described. In the following description, "front and rear" and "left and right" refer to the automobile to which the present invention is applied.

[0018] In Figure 1, the automobile seat S consists of a seat cushion 2, a seat back 3, and a headrest 4. The seat cushion 2 has a seat cushion frame 6 with a plurality of support legs 7, 7 formed at its lower part, and these support legs 7, 7 are fixed to the floor F of the automobile.

[0019] A pair of left and right brackets 8 that protrude upward are attached to the rear end of the seat cushion frame 6, and the seat back frame 10 of the seat back 3 is connected to these brackets 8 via a pivot 9 so as to be able to recline.

[0020] Furthermore, a pair of left and right support tubes 11, 11 are fixed to the upper end of the seat back frame 10, and the headrest 4 is supported by these support tubes 11, 11 so that it can be raised and lowered and fixed in place.

[0021] As shown in Figures 2 to 6, the headrest 4 is configured in a teardrop shape with a headrest frame 12, a foamed urethane cushion member 13 supported by it, and a surface covering 14, and a dynamic damper D is attached to the headrest frame 12.

[0022] The headrest frame 12 is made by bending a pipe material and consists of a pair of left and right main frame members 12a, 12a supported by the pair of support cylinders 11, 11, upper frame members 12b, 12b that are bent forward from the upper ends of the main frame members 12a, 12a, a pair of left and right front longitudinal frame members 12c, 12c that are bent downward from the front ends of the upper frame members 12b, 12b, and a front transverse frame member 12d that integrally connects the lower ends of the front longitudinal frame members 12c, 12c. Reinforcing crossbars 19, which are smaller in diameter than the pipe material, are welded to the left and right front longitudinal frame members 12c, 12c so as to bridge them. A cushion member 13 is formed to enclose the headrest frame 12 from the upper part of the main frame members 12a, 12a to the front transverse frame member 12d, and this cushion member 13 is covered with a skin 14.

[0023] Before the formation of the cushion member 13, a dynamic damper D is attached using the front longitudinal members 12c, 12c and the front transverse member 12d. The dynamic damper D consists of a weight 15, an elastic sheet 16 that wraps around the weight 15 so as to overlap its entire surface, and a damper case 17 having a damper chamber 17C that houses the weight 15 and the elastic sheet 16. The headrest frame 12 is positioned to avoid the area between the upper surface of the damper case 17 and the inner surface of the upholstery 14 that faces the upper surface. The weight 15 is supported in all directions by the damper case 17 via the elastic sheet 16.

[0024] As clearly shown in Figures 2, 5, and 7, the weight 15 is made of cast iron and has a hexahedron that is flattened in the front-to-back direction. Its front surface 15f is formed as a nearly flat convex curved surface, and its rear surface 15r is formed as a curved surface that protrudes more significantly to the rear than the front surface 15f. Furthermore, the weight 15 is formed so that its thickness in the front-to-back direction and / or its width in the left-to-right direction gradually increase upwards, so that the center of gravity G of the weight 15 is located above the center C of the weight 15.

[0025] The elastic sheet 16 is made of urethane foam and has four sheet pieces 16b to 16e extending from a rectangular central part 16a corresponding to the rear surface 15r of the weight. When wrapping the weight 15 with this elastic sheet 16, the front surface 15f of the weight 15 is placed on the central part 16a of the elastic sheet 16, then the four sheet pieces 16b to 16e are raised and folded toward the rear surface 15r of the weight 15, and then adhered to the front surface 15f via double-sided adhesive tape 18. The weight 15 wrapped in the elastic sheet 16 is then housed in a damper case 17 which is split into front and rear halves. At this time, as shown by the dotted line in Figure 3, a portion of the front surface 15f in the front-rear direction of the sheet remains uncovered by the sheet pieces 16b to 16e, but the elastic sheet 16 is interposed in a compressed state between the outer surface of the weight 15 and the inner surface of the damper chamber 17C facing that outer surface. This prevents the elastic sheet 16 from shifting within the damper chamber 17C, keeping the weight 15 in a fixed position at all times, suppressing unnecessary movement of the weight 15, and ensuring the required vibration damping function.

[0026] As shown in Figures 2 to 7, the damper case 17 has a shape similar to the outer shape of the weight 15, and is therefore a box shape that is flattened in the front-rear direction. Its front wall 17f is formed as a nearly flat curved surface corresponding to the front surface 15f of the weight 15, and its rear wall 17r is formed as a curved surface that curves to protrude significantly to the rear, corresponding to the rear surface 15r of the weight 15.

[0027] The damper case 17 is divided into a front first case half 17A and a rear second case half 17B, and a damper chamber 17C capable of accommodating a weight 15 wrapped in an elastic sheet 16 is defined between these first and second case halves 17A and 17B. Each case half 17A and 17B is molded from synthetic resin.

[0028] The first and second case halves 17A and 17B are formed such that the distance A (see Figure 2) between the side surface of the weight 15 along the vertical direction and the inner surface of the damper chamber 17C, which is opposite to this side surface with an elastic sheet 16 in between, increases upward. That is, the distance A increases as it moves away from the support point 9 of the vibration system consisting of the seat back 3 and the headrest 4. In the illustrated example, in order to emphasize damping the longitudinal vibration of the vibration system, the first and second case halves 17A and 17B are formed such that the longitudinal distance A between the weight 15 and the inner surface of the damper chamber 17C increases in the direction away from the support point 9, i.e., upward.

[0029] Furthermore, on one and the other mating surfaces of both case halves 17A and 17B, fitting grooves 20 and fitting protrusions 21 are formed, respectively, that can fit together and surround the damper chamber 17C. Multiple elastic connecting claws 22, 22… projecting outward are formed at the tips of the fitting protrusions 21, and multiple connecting holes 23, 23… are formed at the bottom of the fitting grooves 20, into which these elastic connecting claws 22, 22… can elastically snap-engage. These multiple sets of elastic connecting claws 22, 22… and connecting holes 23, 23… are arranged on the left and right side walls of the first and second case halves 17A and 17B that face each other with the weight 15 in between, and are also arranged on the upper side walls of the first and second case halves 17A and 17B.

[0030] On the outer surface of the case half having the connecting holes 23, 23..., in the illustrated example, the first case half 17A, a plurality of recesses 23a, 23a... are formed by recessing the first case half 17A inward from both the left and right sides and from above, respectively, to receive the claw portions of the elastic connecting claws 22, 22... that engage with the connecting holes 23, 23.... Therefore, the elastic connecting claws 22, 22... do not protrude from the outer surface of the damper case 17, making it easier to handle the dynamic damper D.

[0031] First and second elastic support parts 24A and 24B are integrally formed on the left and right side walls of the second case half 17B. These first and second elastic support parts 24A and 24B each consist of plate-shaped arms 25a and 25b that protrude outward from the left and right side walls of the second case half 17B, and arc-shaped gripping claws 26a and 26b connected to the tips of these arms 25a and 25b, which can snap-engage with the front longitudinal members 12c and 12c to grip them. That is, the arc-shaped gripping claws 26a and 26b can elastically grip the front longitudinal members 12c and 12c beyond half a circumference. The openings 27a and 27b of these arc-shaped gripping claws 26a and 26b are oriented rearward so as to engage with the front longitudinal members 12c and 12c from the front. Therefore, the rearward load from the occupant's head acts in a direction that engages the gripping claws 26a and 26b of the first and second elastic support parts 24A and 24B with the front longitudinal members 12c and 12c, thereby preventing the gripping claws 26a and 26b from detaching. Furthermore, by selecting the length of the arms 25a and 25b, the distance between the centers of both gripping claws 26a and 26b can be made to match the distance between the centers of both front longitudinal members 12c and 12c, thereby ensuring accurate engagement of the gripping claws 26a and 26b with the front longitudinal members 12c and 12c.

[0032] The arc-shaped gripping claws 26a and 26b are formed so that their inner diameters D1 and D2 are different from each other. In the illustrated example, the inner diameter D2 of the gripping claw 26b of the second elastic support part 24B is set to be larger than the inner diameter D1 of the gripping claw 26a of the first elastic support part 24A. Furthermore, the arc-shaped gripping claws 26a and 26b are formed so that their rigidity is different from each other. In the illustrated example, a notch 28 is provided at the tip of the gripping claw 26a of the first elastic support part 24A, or the wall thickness of the gripping claw 26a is set to be thinner than that of the gripping claw 26b, so that the rigidity of the gripping claw 26a of the first elastic support part 24A is lower than that of the gripping claw 26b of the second elastic support part 24B. The first and second elastic support parts 24A and 24B are arranged so as to sandwich the center of gravity G of the weight 15.

[0033] Furthermore, each gripping claw 26a, 26b is provided with a window hole 29, which allows for visual confirmation of the engagement state between each gripping claw 26a, 26b and the front longitudinal members 12c, 12c.

[0034] On the other hand, a positioning support portion 30 is integrally formed on the lower wall of the first case half 17A. This positioning support portion 30 consists of a plate-shaped arm 30a that protrudes downward from the lower wall of the first case half 17A, and a U-shaped contact claw 30b connected to the lower end of the arm 30a and capable of contacting and engaging with the front transverse bone member 12d. The engagement position between the gripping claws 26a, 26b and the left and right front longitudinal bone members 12c, 12c is determined when the contact claw 30b contacts and engages with the front transverse bone member 12d from the rear. In this way, the mounting position of the damper case 17 on the headrest frame 12 is determined.

[0035] At the bases of the arms 25a and 25b of the first and second elastic support parts 24B and the positioning support part 30, a thickened portion 31 is formed to reinforce the rigidity of the base. Furthermore, a pair of stoppers 32, 32 are formed on the left and right side walls of the first case half 17A, which abut against the arms 25a and 25b of the first and second elastic support parts 24A and 24B and restrict their forward deflection, that is, the deflection of the arms 25a and 25b toward the opposite side of the openings 27a and 27b of the gripping claws 26a and 26b. Each stopper 32 is configured in a U-shape in cross-section, with a central wall portion 32a that abuts linearly against the back surface of the corresponding gripping claws 26a and 26b, and a pair of side wall portions 32b, 32b that are connected to both ends of the central wall portion 32a and abut against the curved surface extending from the corresponding arms 25a and 25b to the back surface of the gripping claws 26a and 26b. The stopper 32 with this configuration has high rigidity and can secure a large contact area with the back surface extending from the corresponding arms 25a and 25b to the gripping claws 26a and 26b, so that concentrated stress can be avoided as much as possible and the deflection of the arms 25a and 25b can be effectively restricted. Therefore, even if a large rearward load is applied to the damper case 17 from the occupant's head, the stoppers 32 will contact the front surface of the arms 25a and 25b, restricting the forward deflection of the arms 25a and 25b, and thus restricting unnecessary rearward movement of the damper case 17.

[0036] Furthermore, since the stopper 32 is integrally connected to the outer wall of the fitting groove 20, it also contributes to strengthening the rigidity of the outer wall of the fitting groove 20.

[0037] Furthermore, the arm portion 30a of the positioning support portion 30 has multiple reinforcing ribs 33 that connect the lower wall of the first case half 17A and the contact claw 30b.

[0038] Next, Figure 8 will explain how to embed the dynamic damper D into the headrest 4.

[0039] On the underside of the machine base 35 are attached molds 37a and 37b that can be opened and closed vertically, forming cavities 36 corresponding to the outer shape of the headrest 4 excluding the headrest frame 12. The inner surface of these cavities 36 is pre-covered with the headrest 4's upholstery 14.

[0040] The outer skin 14 is provided with a foaming synthetic resin pouring port 38 opening on its upper surface, and a nozzle guide cylinder 40, which is inserted into the foaming material pouring port 38, is provided on a support plate 39 fixed to the upper surface of the molding table 35. A foaming material supply device 40 for inserting a nozzle 41 into the nozzle guide cylinder 40 is also attached to the support plate 39. Furthermore, a bracket 43 provided on the support plate 39 supports the main frame members 12a, 12a of the headrest frame 12 which are arranged inside the nozzle guide cylinder 40. Thus, within the outer skin 14, the dynamic dampers D supported by the front longitudinal frame members 12c, 12c of the headrest frame 12 are positioned offset to one side of the foaming material pouring port 38.

[0041] Thus, by injecting a foaming material 44 such as urethane from the foaming material supply device 40 through a nozzle 41 into a bag-shaped skin 14 that is in close contact with the inner surface of the cavity 36, and foaming it, a cushion member 13 that encloses the headrest frame 12 and the dynamic damper D can be formed inside the skin 14. At this time, the dynamic damper D, which is supported by the front longitudinal members 12c, 12c, is positioned offset to one side of the foaming material inlet 38, so that the pressure of the foaming material 44 being poured into the foaming material inlet 38 does not directly act on the dynamic damper D, and therefore there is no concern that the elastic support parts 24A, 24B of the dynamic damper D will detach from the front longitudinal members 12c, 12c due to the pouring pressure. Furthermore, when the first and second case halves 17A and 17B are joined, their mating surfaces have fitting grooves 20 and fitting protrusions 21 that fit together. This labyrinth effect reliably prevents the foam material 44 from entering through the joint surfaces of the two case halves 17A and 17B, thus maintaining the proper vibration damping function of the dynamic damper D.

[0042] The headrest 4 manufactured in this way can be removed from the mold by opening the molds 37a and 37b vertically.

[0043] The operation of this first embodiment will now be described.

[0044] In assembling the dynamic damper D, as described above, the weight 15 wrapped in the elastic sheet 16 is fitted into the first case half 17A or the second case half 17B of the damper case 17. Then, the openings of both case halves 17A and 17B are aligned, and the fitting projection 21 of the other opening is deeply fitted into the fitting groove 20 of one opening. Through the engagement of the elastic connecting claws 22, 22... and the locking holes 23, 23..., the two case halves 17A and 17B can be easily joined without using screws, and at the same time, the weight 15 can be supported by the damper case 17 via the elastic sheet 16 in all directions.

[0045] Furthermore, even after the first and second case halves 17A and 17B are joined, the elastic connecting claws 22, 22… can be elastically deformed to detach them from the connecting holes 23, 23…, thereby separating the two case halves 17A and 17B and opening the damper chamber 17C. Therefore, the damping characteristics of the dynamic damper D can be easily adjusted and changed by removing the weight 15 and elastic sheet 16 from the damper chamber 17C and replacing them with those having different characteristics.

[0046] When attaching the assembled dynamic damper D to the headrest frame 12, first, the gripping claws 26a and 26b of the first and second elastic support parts 24A and 24B are pressed from the front against the left and right front longitudinal members 12c, 12c of the headrest frame 12. The left and right gripping claws 26a and 26b then snap into place with the left and right front longitudinal members 12c, 12c, gripping them. Therefore, the damper case 17 can be easily and simply attached to the headrest frame 12 without using any special mounting devices such as screws or bands, and there is no need to perform any special processing on the left and right front longitudinal members 12c, 12c for the snap engagement of the gripping claws 26a and 26b.

[0047] In this case, the inner diameter D2 of the gripping claw 26b of the second elastic support part 24B is set to be larger than the inner diameter D1 of the gripping claw 26a of the first elastic support part 24A, and since the gripping claws 26a and 26b have different rigidities, the manufacturing error between the distance between the centers of the left and right front longitudinal members 12c, 12c and the distance between the centers of the left and right gripping claws 26a and 26b can be absorbed by the relatively small elastic deformation of the left and right gripping claws 26a and 26b. Therefore, despite the aforementioned manufacturing error, both gripping claws 26a and 26b can be easily and reliably attached to both front longitudinal members 12c, 12c.

[0048] When vibrations are transmitted from the floor F of the vehicle to the seat back 3 and headrest 4 via the seat cushion 2 and pivot 9 while the vehicle is in motion, the weight 22 in the dynamic damper D resonates with the elastic deformation of the elastic sheet 16, thereby absorbing the vibration energy of the seat back 3 and headrest 4, and thus damping vibrations in the seat back 3 and headrest 4.

[0049] Furthermore, the dynamic damper D is constructed by housing a weight 15 wrapped in an elastic sheet 16 in a damper case 17 consisting of first and second case halves 17A and 17B that are detachably connected to each other. The second case half 17B has the first and second elastic support parts 24A and 24B formed on it, which engage with the front longitudinal members 12c, 12c from the front in the direction opposite to the position of the second case half 17B, i.e., from the front. The first case half 17A has a positioning support part 30 that abuts against the front transverse member 12d from the rear in the direction opposite to the position of the first case half 17A. Therefore, when the weight 15 vibrates violently in the front-rear direction and a rearward vibration impact force acts on the second case half 17B, that vibration impact force is supported by the left and right front longitudinal members 12c, 12c via the first and second elastic support parts 24A and 24B extending from the second case half 17B. Furthermore, when a forward vibrational impact force acts on the first case half 17A, that vibrational impact force is supported by the front transverse bone member 12d via the positioning support portion 30 extending from the first case half 17A. Therefore, vibrational impact forces in either the forward or backward direction do not act in a direction that separates the first and second case halves 17A and 17B, thus preventing the damper case 17 from disintegrating due to the vibrational impact force of the weight 15. In addition, the vibration of the weight 15 is suppressed from being transmitted to the cushion member 13 by the damper case 17, so it does not cause discomfort to the occupants.

[0050] Furthermore, since the first and second elastic support parts 24A and 24B are positioned to sandwich the center of gravity G of the weight 15, the vibrational impact force of the weight 15 can be stably supported via the second case half 17B. In addition, the multiple sets of elastic connecting claws 22, 22... and connecting holes 23, 23... formed on the first and second case halves 17A and 17B are positioned to sandwich the weight 15, so the vibrational impact force of the weight 15 can be effectively supported by the multiple sets of elastic connecting claws 22, 22... and connecting holes 23, 23... which are engaged with each other, and deformation of the first and second case halves 17A and 17B can be effectively prevented.

[0051] Furthermore, since the center of gravity G of the weight 15 is formed to be above the center C of the weight 15, the center of gravity G of the weight 22 is located as far away as possible from the support point of the vibration system consisting of the seat cushion 2 and the headrest 4. Therefore, the vibration damping function of the dynamic damper D can be provided with a relatively small mass weight 22. Moreover, since the distance A between the side surface of the weight 15 and the inner surface of the damper chamber 17C, which is opposite to this side surface with the elastic sheet 16 in between, is increased in the direction away from the support point 9 of the vibration system consisting of the seat back 3 and the headrest 4, the amplitude of the weight 15 increases as it moves away from the support point 9, and the vibration damping effect can be rationally enhanced.

[0052] Furthermore, the damper case 17 has a box shape that is flattened in the front-rear direction to match the outer shape of the weight 15, its front wall 17f is formed as a nearly flat curved surface corresponding to the front surface 15f of the weight 15, and its rear wall 17r is formed as a curved surface that is more curved than the front wall 17f with its convex side facing rearward, corresponding to the rear surface 15r of the weight 15. As a result, even when the occupant's head is strongly pressed against the front wall 17f of the damper case 17 via the cushioning member 13, the occupant's head is supported over a relatively large area of ​​the front wall 17f of the damper case 17, so as not to cause discomfort to the occupant. Moreover, the curved shape of the front wall 17f and the rear wall 17r contributes to strengthening the rigidity of the damper case 17. Furthermore, the greatly curved rear surface of the weight 15 and the rear wall 17r of the damper case 17 can effectively utilize the space within the headrest 4, allowing for an increase in the thickness of the weight 15, which can contribute to improving the vibration damping function of the dynamic damper D.

[0053] Next, a second embodiment of the present invention shown in Figure 9 will be described.

[0054] In this second embodiment, three or more elastic support parts 24A to 24C supported by the headrest frame 12 are formed in the damper case 17 such that they are located at the vertices of a polygon 34 surrounding the center of gravity G of the weight 15. Specifically, the damper case 17 is formed so that the three first to third elastic support parts 24A to 24C are arranged at the three vertices of an inverted triangle 34, and the weight 15 is formed so that its center of gravity G is located within the region of the inverted triangle 34. The third elastic support part 24C is basically composed of an arm 25c and an arc-shaped gripping claw 26c, similar to the first and second elastic support parts 24A and 24B. The headrest frame 12 is positioned to avoid the upper surface of the damper case 17.

[0055] The first and second elastic support parts 24A and 24B are formed in the second case half 17B, as in the previous embodiment, and are configured to snap-engage from the front with the left and right front longitudinal members 12c, 12c of the headrest frame 12, while the third elastic support member 24C is formed in the first case half 17A and is configured to snap-engage from the rear with the front transverse member 12d.

[0056] Since the other components are the same as in the previous embodiment, the same reference numerals are used in Figure 9 for parts corresponding to the previous embodiment, and redundant explanations are omitted.

[0057] According to this second embodiment, the damper case 17 is formed such that three or more elastic support parts 24A to 24C, supported by the headrest frame 12, are located at the vertices of a polygon 34 surrounding the center of gravity G of the weight 15. This distributes the vibration impact force of the weight 15 almost evenly to all the elastic support parts 24A to 24C via the damper case 17, effectively reducing the vibration of the damper case 17 and contributing to improved ride comfort.

[0058] Next, a third embodiment of the present invention shown in Figure 10 will be described.

[0059] In this third embodiment, the dynamic damper D in the first embodiment is attached to the left and right upper bone members 12b, 12b of the headrest frame 12. Specifically, the first and second elastic support portions 24A, 24B of the damper case 17 are snap-engaged from above to the left and right upper bone members 12b, 12b, and the positioning support portion 30 is contact-engaged from below to the cross member 46 connecting the rear ends of the left and right upper bone members 12b, 12b, so that the headrest frame 12 is not positioned on the upper surface of the damper case 17. The other configurations are the same as in the first embodiment, so in Figure 10, the same reference numerals are used for parts corresponding to the first embodiment, and redundant explanations are omitted.

[0060] According to this third embodiment, by effectively utilizing the space between the left and right upper bone members 12b, 12b for the installation of the dynamic damper D, sufficient thickness can be secured in the front part of the cushion member 13 of the headrest 4 that comes into contact with the occupant's head, and sufficient distance can be obtained from the support point of the vibration system consisting of the seat cushion 2 and the headrest 4 to the center of gravity G of the weight 22, thereby enhancing the vibration damping function of the dynamic damper D.

[0061] Next, the present invention shown in Figure 11 1 Reference Let's describe the form.

[0062] This 1 Reference In this configuration, a dynamic damper D is positioned in the seat back 3 at the inner corners of the left and right corners of the upper part of the seat back frame 10, and a damper case 17 that is approximately a right triangle in front view is positioned at the inner corners of the upper part of the seat back frame 10. A pair of elastic support parts 24A and 24B formed on the upper surface and one side surface of the damper case 17 are snap-engaged to the vertical member 10a and the horizontal member 10b of the seat back frame 10, respectively. The structure of the dynamic damper D is basically the same as that of the first embodiment, except that the shape of the damper case 17 and the weight 15 housed therein differ.

[0063] This 1 ReferenceDepending on the configuration, the dynamic damper D positioned at the top of the seat back frame 10 can effectively dampen vibrations of the seat back 3. Furthermore, the dead space in the inner corner of the upper corner of the seat back frame 10 can be effectively utilized for the installation of the dynamic damper D. In addition, the dynamic damper D may be positioned only in the inner corner of either the left or right upper corner of the seat back frame 10.

[0064] Next, the present invention shown in Figure 12 2 References Let's describe the form.

[0065] This 2 References In this configuration, a pair of inclined bone sections 49a, 49a, which are inclined in opposite directions at the center of a wavy bone member 49 that integrally connects the upper parts of the left and right vertical bone members 10a, 10a of the seat back frame 10, are snap-engaged to a pair of elastic support sections 24A, 24B formed on both the left and right sides of the damper case 17. At this time, the pair of elastic support sections 24A, 24B are positioned diagonally in correspondence with the pair of inclined bone sections 49a, 49a, thereby preventing vertical movement of the pair of elastic support sections 24A, 24B at the pair of inclined bone sections 49a, 49a. The basic structure of the dynamic damper D is the same as that of the first embodiment. Thus, the vibration damping of the seat back 3 can be effectively performed by the action of a single dynamic damper D attached to the upper and central part of the seat back frame 10.

[0066] Finally, the present invention as shown in Figure 13. 3 References Let's describe the form.

[0067] This 3 ReferencesIn this configuration, to dampen vibrations of the seat cushion 2, a damper case 17 of the dynamic damper D is attached to a front reinforcing plate 6a that is welded to the front of the seat cushion frame 6 and extends in the left-right direction. In this case, a pair of elastic support parts 50, 50 are formed on the upper surface of the damper case 17. Each elastic support part 50 consists of a shaft portion 50a that protrudes from the outer surface of the damper case 17 and an arrowhead-shaped locking projection 50b formed at the tip of the shaft portion 50a. A slit 50c is provided extending from the tip of the locking projection 50b to the shaft portion 50a to allow for elastic reduction of the diameter of the locking projection 50b. An elastic rubber collar 52 is fitted onto the shaft portion 50a. On the other hand, a pair of locking holes 51, 51 are drilled in the front reinforcing plate 6a corresponding to the pair of elastic support parts 50, 50. By pushing the locking projections 50b of the elastic support parts 50, 50 into these locking holes 51, 51 from below, each locking projection 50b does not elastically shrink in diameter, but after passing through the corresponding locking hole 51, it expands back to its original shape, i.e., snaps into place and prevents it from detaching from the locking hole 51. At this time, the elastic collar 52 fitted to the shaft part 50a is compressed between the front reinforcing plate 6a and the damper case 17, and due to the repulsive force, the locking projections 50b are held securely on the front surface of the front reinforcing plate 6a without any play. Except for the elastic support parts 50, 50, the structure of the damper case 17, the weight 15 housed therein, and the elastic sheet 16 surrounding it are basically the same as those of the first embodiment. Therefore, in Figure 12, the same reference numerals are used for parts corresponding to the first embodiment, and redundant explanations are omitted.

[0068] This 3 References Depending on the configuration, the dynamic damper D positioned at the front end of the seat cushion frame 6 effectively dampens vibrations of the seat cushion 2. Furthermore, the dead space below the front reinforcing plate 6a at the front end of the seat cushion frame 6 can be effectively utilized for installing the dynamic damper D, and the elastic support parts 50, 50 can be snap-engaged into the locking holes 51, 51 of the front reinforcing plate 6a with a simple push-in operation, making it easy to install the damper case 17.

[0069] The present invention is not limited to the embodiments described above, and various design modifications are possible without departing from the spirit of the invention. For example, the first to third embodiments may be modified as follows: 4 and 5 The reference form can also be used in combination. Furthermore, one of the first and second halves 17A and 17B constituting the damper case 17 can be formed as a box shape with an opening, and the other as a lid shape that closes the opening. In addition, the seat device of the present invention is not limited to automobiles, but can also be applied to railway vehicles, aircraft, etc. Furthermore, the seat S can be installed extending out from the wall surface of the vehicle. [Explanation of Symbols]

[0070] C······Center of the weight D······Dynamic damper F······vehicle floor G... Center of gravity of the weight S...Seat 2...Seat cushion 3. Seat back 4······Headrest 6. Seat cushion frame 7... Support leg 8....bracket 9...Axis 10...Seat back frame 11... Support tube 12·····Headrest frame 13. Cushioning material 14. Headrest upholstery 15... Weight 15f... Front of the weight 15r....Rear side of the weight 16...Elastic sheet 16a... Center of the elastic sheet 16b~16e... Sheet pieces of elastic sheet 17...Damper Case 17C...Damper Room

Claims

1. In a vehicle seat equipped with a dynamic damper (D) inside a headrest (4) which constitutes part of the seat (S), The dynamic damper (D) comprises an elastic sheet (16) that is elastically deformable and forms part of the dynamic damper (D), a weight (15) that is supported by the elastic sheet (16) and forms part of the dynamic damper (D), with its center of gravity (G) set to be offset upward in the vertical direction of the sheet relative to its center (C), a damper case (17) that forms part of the dynamic damper (D) and has a damper chamber (17C) that houses the weight (15) and the elastic sheet (16), and a cushion member (13) that covers the dynamic damper (D) inside the headrest (4), The weight (15) is characterized in that it is formed in at least one of the following shapes: front-to-back asymmetrical and up-to-down asymmetrical.

2. The vehicle seat according to claim 1, characterized in that the weight (15) is formed such that the thickness in the front-to-back direction and / or the width in the left-to-right direction of the seat gradually increase upward.

3. The vehicle seat according to claim 1 or claim 2, characterized in that the weight (15) forms a flattened hexahedron in the front-rear direction of the seat.

4. The seat for a vehicle according to any one of claims 1 to 3, characterized in that the rear surface (15r) of the weight (15) in the front-rear direction of the seat is formed as a curved surface that protrudes rearward.

5. The dynamic damper (D) comprises a damper case (17) that constitutes the outer shell and a weight (15) housed inside the damper case (17). The damper case (17) is characterized in that its outer shell is curved to conform to the shape of the weight (15), as described in any one of claims 1 to 4.

6. The elastic sheet (16) is housed in the damper case (17) together with the weight (15), with the weight (15) overlapping the elastic sheet (16) and the weight (15) being wrapped around the weight (15) so as to overlap its entire surface. The elastic sheet (16) is formed by extending four sheet pieces (16b to 16e) from a rectangular central portion (16a) facing the rear surface (15r) of the weight (15) in the front-rear direction. The seat for a vehicle according to any one of claims 1 to 5, characterized in that the sheet pieces (16b to 16e) do not cover a portion of the front surface (15f) of the weight (15) in the front-rear direction of the seat.

7. The vehicle seat according to any one of claims 1 to 6, characterized in that the elastic sheet (16) is interposed in a compressed state between the outer surface of the weight (15) and the inner surface of the damper case (17) which forms the outer shell of the dynamic damper (D) and faces the outer surface.

8. The aforementioned seat (S) is composed of a seat cushion (2), a seat back (3), and a headrest (4). The aforementioned seat cushion (2) has a seat cushion frame (6), The seat back (3) has a seat back frame (10) and is reclinedly connected to the seat cushion frame (6) via a pivot (9), The vehicle seat according to any one of claims 1 to 7, characterized in that the headrest (4) comprises a headrest frame (12), a cushion member (13) covering the surface of the headrest frame (12), and a headrest surface (14).

9. The seat cushion frame (6) is fixed to the floor (F) of the vehicle by a plurality of support legs (7) at the bottom. A pair of left and right brackets (8) projecting upward are connected to the rear end of the seat cushion frame (6), and the seat back frame (10) is reclined to the brackets (8) via the pivot (9). A pair of left and right support cylinders (11) are fixed to the upper end of the seat back frame (10), and the headrest (4) is supported by the support cylinders (11) so that it can be raised and lowered and fixed in place. The headrest (4) is formed by attaching the dynamic damper (D) to the headrest frame (12), The vehicle seat according to claim 8, characterized in that the dynamic damper (D) comprises the weight (15), the elastic sheet (16) enclosing the weight (15), and the damper case (17) having the damper chamber (17C) that houses the weight (15) and the elastic sheet (16).

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