JP7369923B2 - Dynamic dampers, headrests and vehicle seats - Google Patents

Description

The present invention relates to a dynamic damper that includes a weight, an elastic member that vibrably supports the weight, and a damper case that houses the weight and the elastic member, as well as a headrest and a vehicle seat that include the dynamic damper. .

2. Description of the Related Art The dynamic damper described above is applied to, for example, a vehicle seat to reduce vibrations of the seat, which is conventionally known as disclosed in Patent Document 1.

Patent No. 6110853

In the dynamic damper disclosed in Patent Document 1, the weight is entirely covered with an elastic member, and the weight cannot be assembled into the damper case while being directly viewed.

However, if the corners of the weight are directly visible when assembling the weight and elastic member into the damper case, the weight can be directly and easily aligned with the inner surface of the damper case, making it easier to assemble the weight. This is effective in improving work efficiency and is also effective in confirming the attachment state of the elastic member to the end of the weight.

The present invention has been made in view of the above circumstances, and it is possible to improve assembly workability by making it possible to check the corners of the weight when assembling the weight into the damper case, and furthermore, it is possible to improve assembly workability by making it possible to check the corners of the weight when assembling the weight into the damper case. An object of the present invention is to provide a dynamic damper that allows easy confirmation of the state of attachment to the parts, as well as a headrest and a vehicle seat equipped with the dynamic damper.

In order to achieve the above object, the present invention provides a dynamic damper including a weight, an elastic member that vibrably supports the weight, and a damper case that houses the weight and the elastic member. Corner confirmation means for confirming at least a part of the corners where at least one end surface of the weight and first and second side surfaces that are continuous with and mutually adjacent to the one end surface are assembled. The elastic member includes a first elastic member that covers substantially the entire circumference of the outer surface between the one end surface and the other end surface of the weight, and a first elastic member that covers the outer surface between the one end surface and the other end surface of the weight and the inner surface of the damper case. second and third elastic members respectively coupled to the first elastic member, and the corner confirmation means includes a second and third elastic member coupled to the first elastic member so as to expose at least some corners of the plurality of corners of the weight. The first feature is that it is composed of a notch formed in the .

The present invention also provides a dynamic damper comprising a weight, an elastic member that vibrably supports the weight, and a damper case that houses the weight and the elastic member, in which at least one end surface of the weight , comprising a corner confirmation means for confirming at least a part of the corners where the first and second side surfaces that are continuous with the one end surface and are adjacent to each other converge, and the elastic member is , a first elastic member that covers substantially the entire circumference of the outer surface between the one end surface and the other end surface of the weight, and a second elastic member that connects the one end surface and the other end surface of the weight to the inner surface of the damper case, respectively. a third elastic member, the weight has a polygonal cross section, the first elastic member has a bent portion corresponding to a corner of a side surface of the weight, and the bent portion includes a third elastic member; The second feature is that a bending-facilitating means is provided to make bending of the first elastic member easier than at a portion other than the bending portion.

The present invention also provides a dynamic damper comprising a weight, an elastic member that vibrably supports the weight, and a damper case that houses the weight and the elastic member, in which at least one end surface of the weight , comprising a corner confirmation means for confirming at least a part of the corners where the first and second side surfaces that are continuous with the one end surface and are adjacent to each other converge, and the elastic member is , a first elastic member that covers substantially the entire circumference of the outer surface between the one end surface and the other end surface of the weight, and a second elastic member that connects the one end surface and the other end surface of the weight to the inner surface of the damper case, respectively. a third elastic member, a friction reducing member is attached to the second and third elastic members, the friction reducing member being located on the opposite side of the weight and abutting the inner surface of the damper case; A third feature is that the elastic member is disposed in a compressed state between the friction reducing member and the weight within the damper case .

Further, in the present invention, in addition to the second or third feature, the first elastic member is formed in an end shape that exposes at least one end of the weight, including at least two of the corners. , the fourth feature is that the end shape constitutes the corner confirmation means.

Further, in addition to the first or third feature, the present invention provides that the weight has a polygonal cross section, and the first elastic member has a bent portion corresponding to a corner of a side surface of the weight. A fifth feature is that the bending portion is provided with a bending facilitating means for making bending easier than a portion of the first elastic member other than the bending portion.

Further, in addition to the first feature, the present invention provides that a friction reducing member is attached to the second and third elastic members, the friction reducing member being located on the opposite side of the weight and abutting on the inner surface of the damper case; A sixth feature is that the second and third elastic members are disposed in a compressed state between the friction reducing member and the weight within the damper case.

Further, in addition to the second or fifth feature, the present invention provides that the bending-facilitating means is constituted by a thin portion formed in a part of the first elastic member corresponding to a corner of a side surface of the weight. The seventh feature is that

Further, in addition to any one of the first to seventh features, the present invention provides an eighth feature in which the first elastic member is disposed apart from at least one of the second and third elastic members. It is a feature of

Furthermore, in addition to any one of the first to eighth features, the present invention provides a ninth feature that the first elastic member and the second and third elastic members are made of different elastic materials. The characteristics of

Further, the present invention is a headrest equipped with a dynamic damper having any one of the first to ninth features, and a tenth feature is that the damper case is held by a frame or a cushion member of the headrest.

The present invention also provides a vehicle seat equipped with a dynamic damper having any one of the first to ninth characteristics, wherein the damper case is held by a frame or a cushion member of at least one of a seat back and a seat cushion. The eleventh feature is that

According to the first to third features of the present invention, at least one of the corner portions where at least one end surface of the weight and the first and second side surfaces that are continuous with the one end surface and adjacent to each other are assembled. Since some of the corners can be checked when the weight is assembled into the damper case, it is possible to directly and easily align the corner of the weight with respect to the inner surface of the damper case when assembling the weight. As a result, it is possible to improve the workability of assembling the weight into the damper case and, by extension, the workability of assembling the dynamic damper. Furthermore, by checking the corners of the weight before assembling the weight into the damper case, it is possible to easily confirm in advance the attachment state of the elastic member to the end of the weight. The elastic members include a first elastic member that covers substantially the entire outer surface of the weight, and second and third elastic members that connect one end surface and the other end surface of the weight to the inner surface of the damper case, respectively. Since the weight is divided, the shape of each elastic member can be simplified as much as possible, and the moldability of the elastic member is better than when the weight is covered with a single elastic member. Moreover, according to the first feature of the present invention, the corner confirmation means includes a notch formed in the first elastic member so as to expose at least some of the corners of the plurality of corners of the weight. Therefore, it is sufficient to form notches corresponding to the corners in the first elastic member, and manufacturing is easy.

According to the second feature, the weight is formed to have a polygonal cross section, the first elastic member has a bent portion corresponding to a corner of a side surface of the weight, and the bent portion includes: Since the first elastic member is provided with an easy-to-bend means for making the bending easier than other parts of the first elastic member, the first elastic member can be easily bent in accordance with the corner of the side surface of the weight having a polygonal cross-section. It can be bent and has good assembly workability .

According to the third feature, a friction reducing member that is located on the opposite side of the weight and abuts against the inner surface of the damper case is attached to the second and third elastic members, and the second and third elastic members is disposed in a compressed state between the friction reducing member and the weight within the damper case, so the second and third elastic members not only give it sufficient hardness as a damper spring, but also reduce friction. The dynamic damper can be easily fixed to the inner surface of the damper case without play through the reducing member, and the workability of assembling the dynamic damper is improved.

According to the fourth feature, the first elastic member is formed in an end shape that exposes at least one end including two corners of the weight, and the end shape allows the corner confirmation means to be exposed. Therefore, it is sufficient to simply make the first elastic member smaller than the weight, and manufacturing is easy.

According to the fifth feature, the weight has a polygonal cross section, the first elastic member has a bent portion corresponding to a corner of a side surface of the weight, and the bent portion includes: Since the first elastic member is provided with an easy-to-bend means for making the bending easier than other parts of the first elastic member, the first elastic member can be easily bent in accordance with the corner of the side surface of the weight having a polygonal cross-section. It can be bent and has good assembly workability.

According to the sixth feature, a friction reducing member is attached to the second and third elastic members, and the friction reducing member is located on the opposite side of the weight and comes into contact with the inner surface of the damper case. is disposed in a compressed state between the friction reducing member and the weight within the damper case, so the second and third elastic members not only give it sufficient hardness as a damper spring, but also reduce friction. The dynamic damper can be easily fixed to the inner surface of the damper case without play through the reducing member, and the workability of assembling the dynamic damper is improved.

According to the seventh feature, the bending ease means is constituted by a thin portion formed in a part of the first elastic member corresponding to the corner of the side surface of the weight. By simply reducing the thickness of the first elastic member, the first elastic member can be easily and easily bent to correspond to the corner of the side surface of the weight.

Further, according to the eighth feature, the corner can be confirmed by simply arranging the first elastic member apart from at least one of the second and third elastic members, and manufacturing is easy.

According to the ninth feature, since the first elastic member and the second and third elastic members are made of different elastic materials, the first elastic member The material selection, hardness setting, thickness setting, etc. of the second and third elastic members can be optimally performed.

Further, according to the tenth feature, the effect of the first feature can be exhibited in the headrest.

Further, according to the eleventh feature, the effect of the first feature can be exerted in a vehicle seat.

A side view of the automobile seat device according to the first embodiment of the present invention Enlarged cross-sectional view of essential parts of the section viewed from arrow 2 in Figure 1 (around the headrest) (cross-sectional view taken along the line 2-2 in Figure 3) Cross-sectional view taken along line 3-3 in Figure 2 Enlarged sectional view taken along line 4-4 in Figure 3 Perspective view showing the internal structure of the headrest Exploded perspective view of the dynamic damper inside the headrest Front view showing a modification of the corner confirmation means (first elastic member) A perspective view showing a modification of the combination structure of the weight and the first elastic member FIG. 3 is a plan view of a combination structure of an elastic member and a weight seen from above, in which (a) shows an embodiment, and (b) to (d) show modified examples. FIG. 6 is a developed view showing the unfolded form before the first elastic member is wound around a weight, in which (a) shows the first embodiment (that is, corresponds to the view in the direction of arrow 9a in FIG. 6) , and (b) shows a modified example. show A sectional view corresponding to FIG. 3 that simply shows the first to third variations of the combination structure of the elastic member, damper case, weight, and weight guide part. A cross-sectional view corresponding to FIG. 3 that simply shows fourth to sixth variations of the combination structure of the elastic member, damper case, weight, and weight guide part. A sectional view corresponding to FIG. 3 that simply shows a seventh modification of the combination structure of an elastic member, a damper case, a weight, and a weight guide part. A perspective view showing the internal structure of a headrest showing a second embodiment of the present invention A perspective view showing the internal structure of a car seat showing a third embodiment of the present invention A perspective view showing the internal structure of a car seat showing a fourth embodiment of the present invention A perspective view showing the internal structure of a car seat showing a fifth embodiment of the present invention A sectional view corresponding to FIG. 3 showing the sixth embodiment of the present invention A sectional view corresponding to FIG. 3 showing the seventh embodiment of the present invention

First, a first embodiment of the present invention shown in FIGS. 1 to 13 will be explained. In the following description, front, rear, left and right are referred to with reference to an automobile as a vehicle to which the present invention is applied.

In FIG. 1, an automobile seat 1 includes 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 the support legs 7, 7 are fixed to the floor F of the automobile. It should be noted that a conventionally known position adjustment mechanism may be interposed between the support legs 7, 7 and the floor F to adjust the front and rear positions of the support legs 7, 7.

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

Further, a pair of left and right support tubes 11, 11 are fixedly provided at the upper end of the seat back frame 10, and the headrest 4 is supported by these support tubes 11, 11 so as to be movable up and down and fixed.

As shown in FIGS. 2 to 6, the headrest 4 has a teardrop-shaped structure including a headrest frame 12, a foamed urethane cushion member 13 supported by the headrest, and a skin 14 covering the surface of the headrest frame 12. A dynamic damper D is attached to the frame 12.

The headrest frame 12 is made by bending a pipe material, and includes a pair of left and right main frame members 12a, 12a supported by the pair of support tubes 11, 11, and a frame extending forward from the upper end of these main frame members 12a, 12a. The bent upper bone members 12b, 12b, a pair of left and right front vertical bone members 12c, 12c extending downwardly from the front ends of these upper bone members 12b, 12b, and the lower ends of these front vertical bone members 12c, 12c. A reinforcing cross bar 19 having a smaller diameter than the pipe material is welded to the left and right front vertical rib members 12c so as to bridge the front horizontal rib members 12d which are integrally connected to each other.

Thus, a cushion member 13 is formed so as to cover the headrest frame 12 from the upper portions of the main frame members 12a, 12a to the front horizontal frame member 12d, and this cushion member 13 is covered with a skin 14. Before forming this cushion member 13, a dynamic damper D is attached using the front vertical rib members 12c, 12c and the front horizontal rib member 12d.

The dynamic damper D includes a weight 15, a first elastic member S1 that covers the entire circumference of the outer surface between one upper and lower end surface and the other end surface of the weight 15, and one upper and lower end surface and the other end surface of the weight 15. The damper case 17 includes second and third elastic members S2 and S3 that respectively cover the weight 15 and the elastic members S1 to S3. The weight 15 is vibrably elastically supported by the damper case 17 mainly through the second and third elastic members S2 and S3, as will be described later.

The weight 15 is made of metal (for example, cast iron), and in the illustrated example is formed into a substantially rectangular parallelepiped shape that is flat from front to back.

The first elastic member S1 is formed in a rectangular sheet shape, and is fixed (eg, bonded) to the side surface of the weight 15 while being wrapped around the entire circumference of the outer surface of the weight 15. When the first elastic member S1 is set in the damper case 17 together with the weight 15, a slight gap 91, 92 is set between the inner surface of the front and rear side walls and the inner surface of the left and right side walls of the damper case 17. . When the weight 15 vibrates back and forth and left and right, the front and rear sides and left and right sides of the first elastic member S collide with the inner surface of the damper case 17 so as to fill the gaps 91 and 92. The resulting impact is absorbed and alleviated by the elastic deformation of the first elastic member S.

The first elastic member S1 is set in the damper case 17 together with the weight 15 so that the gaps 91 and 92 do not occur (that is, the inner surface of the damper case 17 is in an uncompressed state or a slightly compressed state). may be placed so that they touch each other).

The upper and lower ends of the first elastic member S1 have an end shape C that exposes the upper and lower ends of the weight 15, including the upper and lower left and right corners E, in a band shape (i.e., the upper and lower ends of the weight 15). The end portions are formed in a shape that is recessed toward the vertical center from the upper end and the lower end, respectively, in other words, the vertical dimension is shorter than the weight 15.

The end shape C constitutes a corner confirmation means for confirming at least a part of the corner E of the weight 15. In this case, the corner E of the weight 15 refers to the upper and lower end surfaces of the weight 15, and the first and second side surfaces (i.e., front side, left and right side) that are continuous with and adjacent to each end surface. It refers to a corner formed by aggregation (in other words, the three faces of the weight 15 are aggregation).

FIG. 7 shows a modification of the corner confirmation means. For example, in FIG. A corner confirmation means is constituted by a notch C' obtained by cutting out a part (corner part) of the elastic member S1. In addition, (b) shows that the first elastic member S1 has an end shape C that exposes only one end of the upper and lower sides of the weight 15 in a band shape, similar to the embodiment described above, and the end shape C A corner confirmation means is shown.

Although not shown, the first elastic member S1 may be made of a transparent synthetic resin material to serve as a corner confirmation means. In addition, in (c), in addition to the modification of (a), a notch 80 is provided at one upper and lower end of the first elastic member S1 to expose the end of the weight 15 at the middle part in the width direction (that is, in the left-right direction). The formed one is shown.

Further, since the weight 15 is formed in a substantially rectangular parallelepiped shape as described above, the weight 15 is formed in a polygonal cross section (more specifically, a horizontal cross section), so the first elastic member S1 is It has a bending portion S1c corresponding to the corner of the outer surface of No. 15. The bending portion S1c is provided with a bending facilitating means for making the bending easier than the portions of the first elastic member S1 other than the bending portion S1c.

In this embodiment, as shown in FIGS. 4, 6, and 10(a), the bending-facilitating means is attached to a part of the first elastic member S1 corresponding to a corner of the outer surface of the weight 15. It is composed of a thin portion 81 that is formed. Further, as shown in FIG. 10(b), a plurality of holes are formed in a part of the first elastic member corresponding to the corners of the weight 15 at intervals (in other words, in the form of perforations along the bent portion S1c). The small hole 82 may constitute a means for facilitating bending.

Each of the elastic members S1 to S3 is preferably made of a sheet-like elastic material that is softer than the cushion member 13. Further, in the embodiment, the first elastic member S1 and the second and third elastic members S2 and S3 are made of another elastic material, for example, urethane foam molded to a desired thickness, and have a foaming rate (therefore, elasticity). Composed of elastic materials with different forces (force).

The second and third elastic members S2 and S3 are set to be thicker and harder than the first elastic member S1 when set in the damper case 17. In order to impart sufficient hardness to the second and third elastic members S2 and S3, the second and third elastic members S2 and S3 are connected to the inner surfaces of the upper and lower walls of the damper case 17 and the weight in the set state. It is placed in a compressed state between the upper and lower end surfaces of 15.

The first elastic member S1 and the second and third elastic members S2 and S3 may be made of different elastic materials (for example, a urethane foam material and a rubber material), or may be made of the same elastic material. You may. Further, it is desirable that the second and third elastic members S2 and S3 are made of an elastic material that is harder than the first elastic member S1 even in their free state.

Further, the second and third elastic members S2 and S3 are formed in a rectangular sheet shape smaller than the cross-sectional form of the weight 15, and are joined (for example, glued) to one upper and lower end surface and the other end surface of the weight 15, respectively. . A rectangular flat plate-shaped friction reducing member 70 that is located on the opposite side of the weight 15 and contacts the inner surface of the upper and lower side walls of the damper case 17 is joined (for example, glued) to the second and third elastic members S2 and S3. The second and third elastic members S2 and S3 are compressed between the end face of the weight 15 and the friction reducing member 70, which is pressed and fixed to the inner surface of the upper and lower side walls of the damper case 17 by their elastic force. Intervened.

In this way, the outer ends of the second and third elastic members S2 and S3 are not directly fixed to the inner surfaces of the upper and lower side walls of the damper case 17, but are pressed and fixed via the friction reducing member 70. The three elastic members S2 and S3 can be easily pressed and fixed to the inner surface of the damper case 17 via the friction reducing member 70 without play. During the fixing operation, the friction reducing member 70 smoothly slides into contact with the inner surface of the damper case 17, which improves the workability and improves the workability of assembling the dynamic damper.

Further, the friction reducing member 70 of this embodiment is made of a synthetic resin material with a low surface friction coefficient, and thereby the friction reducing member 70 of a desired form can be easily molded. Incidentally, the friction reducing member 70 may be made of another material having a low surface friction coefficient, for example, a metal plate with a polished surface.

Incidentally, it is also possible to omit the friction reducing member 70 and directly connect the second and third elastic members S2 and S3 to the inner surfaces of the upper and lower side walls of the damper case 17 (for example, by bonding, etc.).

Further, FIG. 8 shows a modification of the weight 15. For example, in (a) the weight 15 is shaped like a cylinder, in (b) it is shaped like a square pyramid tapering upward, and in (c) it is shaped like a square pyramid tapering downward. (d) shows one formed into a truncated conical shape, and (e) shows one formed into an inverted truncated conical shape. Note that the unfolded shape of the sheet-shaped first elastic member S1 is appropriately set so that it can be wrapped around the outer surface of these modified examples of the weight 15 over the entire circumference without loosening.

Further, FIG. 9 shows a modification of the second and third elastic members S2 and S3. That is, in contrast to the present embodiment shown in (a), in (b), the second and third elastic members S2 and S3 are weighted in the lateral direction (specifically, the front-back direction) of the weight 15 in plan view. The one formed longer than the weight 15 is shown in FIG. 15 is shown, and in (d), the second and third elastic members S2 and S3 are formed shorter than the weight 15 both vertically and horizontally (specifically, in the front, rear, left, and right directions) in plan view. What has been done will be shown.

The weight 15 covered with the sheet-shaped first to third elastic members S1 to S3 as described above is housed in a damper case 17 that is divided into front and rear halves. Thus, the weight 15 is elastically supported by the damper case 17 mainly via the second and third elastic members S2 and S3 so as to be able to vibrate.

As shown in FIGS. 2 to 6, the damper case 17 has a shape similar to the outer shape of the weight 15, and therefore has a box shape that is flat in the front and rear direction. Corresponding to the front surface 15f of the weight 15, the rear wall 17r is formed to be a flat surface or a curved surface close to the flat surface, and the rear wall 17r is formed to be a flat surface or a curved surface close to the flat surface corresponding to the rear surface 15r of the weight 15.

The damper case 17 is divided into a first case half 17A on the front side and a second case half 17B on the rear side, and each case half 17A, 17B is molded from synthetic resin. A rectangular fitting groove 20 and a fitting projecting wall 21 that can be fitted into each other are formed on one and the other of the opposing surfaces of both case halves 17A and 17B, respectively, and a fitting projecting wall 21 has a rectangular fitting groove 20 and a fitting projecting wall 21 at the tip thereof. The bottom of the fitting groove 20 is formed with a plurality of connecting claws 22, 22... projecting outward, and a plurality of connecting holes 23, 23... with which these connecting claws 22, 22... can be elastically snap-engaged. is formed.

First and second elastic support parts 24A and 24B are integrally formed on both left and right side walls of the second case half 17B. These first and second elastic support parts 24A and 24B are connected to plate-shaped arms 25a and 25b that protrude outward from the left and right side walls of the second case half 17B, respectively, and the tips of these arms 25a and 25b. The front vertical bone members 12c, 12c are provided with arch-shaped gripping claws 26a, 26b that can be snap-engaged to grip them. That is, the arc-shaped gripping claws 26a, 26b can elastically grip the anterior longitudinal bone members 12c, 12c over half of their respective circumferences. The arc-shaped gripping claws 26a, 26b have openings 27a, 27b directed rearward so as to engage the front vertical bone members 12c, 12c from the front. Therefore, the backward load from the occupant's head acts in a direction that causes the gripping claws 26a, 26b of the first and second elastic support parts 24A, 24B to engage with the front vertical bone members 12c, 12c. It is possible to prevent the claws 26a, 26b from coming off. Furthermore, by selecting the lengths of the arms 25a, 25b, the distance between the centers of both gripping claws 26a, 26b is made to match the distance between the centers of both front vertical bone members 12c, 12c, and the front longitudinal bone members of gripping claws 26a, 26b are 12c, 12c can be engaged accurately.

The arc-shaped gripping claws 26a and 26b are formed such 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 larger than the inner diameter D1 of the gripping claw 26a of the first elastic support part 24A. Further, the arc-shaped gripping claws 26a and 26b are formed so that their rigidities are different from each other. In the illustrated example, a notch is provided at the tip of the gripping claw 26a of the first elastic support part 24A 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. 28, or the thickness of the gripping claws 26a is set thinner than that of the gripping claws 26b. Further, the first and second elastic support portions 24A and 24B are arranged to sandwich the center of gravity G of the weight 15.

Further, each gripping claw 26a, 26b is provided with a window hole 29, through which it is possible to visually confirm the state of engagement between each gripping claw 26a, 26b and the front vertical bone members 12c, 12c. ing.

Meanwhile, a positioning support portion 30 is integrally formed on the lower wall of the first case half 17A. The positioning support part 30 includes a plate-shaped arm 30a that projects downward from the lower wall of the first case half 17A, and a plate-shaped arm 30a that is connected to the lower end of the arm 30a and abuts and engages with the front transverse bone member 12d. The abutment claw 30b abuts and engages the front horizontal bone member 12d from the rear, thereby engaging the gripping claws 26a, 26b and the left and right front vertical bone members. 12c, the engagement position with 12c is defined. In this way, the mounting position of the damper case 17 on the headrest frame 12 is determined.

At the roots of the arms 25a and 25b of the first and second elastic support parts 24B and the positioning support part 30, thickened parts 31 are formed to strengthen the rigidity of the roots, and furthermore, the first and second elastic support parts 24A A pair of stoppers 32, 32 abut against the arms 25a, 25b of the gripping claws 26a, 24B and restrict their forward deflection, that is, the deflection of the arms 25a, 25b toward the side opposite to the openings 27a, 27b of the gripping claws 26a, 26b. It is formed on both left and right side walls of the first case half 17A. Each stopper 32 has a central wall portion 32a that linearly abuts the back surface of the corresponding gripping claws 26a, 26b, and a central wall portion 32a that is connected to both ends of the central wall portion 32a and extends from the corresponding arms 25a, 25b to the gripping claws 26a, 26b. A pair of side wall portions 32b, 32b abut against a curved surface extending over the back surface, and the cross section is formed into a U-shape. The stopper 32 having such a configuration has high rigidity and can secure a wide contact area with the back surface from the corresponding arms 25a, 25b to the gripping claws 26a, 26b, so that the stopper 32 can avoid concentrated stress as much as possible Deflection of 25a and 25b can be effectively restricted. Therefore, even if a large backward load acts on the damper case 17 from the occupant's head, the stoppers 32, 32 will come into contact with the front surfaces of the arms 25a, 25b to restrict forward deflection of the arms 25a, 25b. This makes it possible to restrict unnecessary backward movement of the damper case 17.

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. Further, the arm portion 30a of the positioning support portion 30 is formed with a plurality of reinforcing ribs 33 that connect the lower wall of the first case half 17A and the abutment claw 30b.

By the way, the dynamic damper D includes a movement regulating means WG that regulates the movement of the weight 15 in a predetermined direction (in the illustrated example, the vertical direction). In this embodiment, the movement restricting means WG is composed of a weight guide part WG that slidably guides the movement of the weight 15 in a specific direction different from the above-mentioned predetermined direction (in the illustrated example, the front-rear direction and the left-right direction). Ru.

More specifically, on the upper and lower inner surfaces of the opposing left and right side walls of the first and second case halves 17A and 18B that constitute the divided damper case 17, there are grooves that protrude in the direction toward each other and in the front-rear direction. A pair of extending left and right protruding weight guide portions WG are integrally provided in a protruding manner. A pair of lower weight guide portions WG of the first and second case halves 17A and 18B abut on the lower end portion of the weight 15 so as to be able to slide back and forth and left and right, and a pair of upper weight guide portions The WG comes into contact with the upper end of the weight 15 so as to be slidable in the front, back, right, and left directions, thereby restricting vertical relative movement of the weight 15 with respect to the damper case 17 .

Each of the upper and lower weight guide portions WG is in contact with the inner surface of the corresponding upper and lower friction reducing members 70 on the weight 15 side, and supports the friction reducing member 70 from the weight 15 side. Although not shown, a modification in which a slight vertical clearance is provided between the weight guide portion WG and the friction reducing member 70 can also be implemented.

Furthermore, as another modification of the damper case 17, although not shown, a pair of left and right protrusions may be provided only on the inner surface of the left and right side walls of one of the first and second case halves 17A and 18B. A weight guide portion WG having a shape may be provided in a protruding manner.

Each of the upper and lower weight guide parts WG is arranged at a position avoiding each of the elastic members S1 to S3. Moreover, the left and right pairs of upper and lower weight guide portions WG are arranged to face each other with the second elastic member S2 and the third elastic member S3 interposed therebetween. Thereby, the movement regulation and sliding guidance of the weight 15 can be stably and accurately performed by the opposing left and right weight guide portions WG.

The friction reducing member 70, which is joined to the outer end surfaces (end surfaces opposite to the weight 15) of the second and third elastic members S2 and S3, is connected to the upper and lower weight guide portions WG and the upper and lower damper cases 17. It is inserted between each inner end surface. As a result, the dead space between the weight guide part WG (therefore, the movement regulating means) and the damper case 17 can be effectively used to easily deploy the friction reducing member 70, and the structure can be simplified and downsized. . Further, the friction reducing member 70 is stably and firmly held in a fixed position between the weight guide portion WG and the inner surfaces of the upper and lower side walls of the damper case 17.

Further, the longitudinal length of the weight guide portion WG when viewed from the front (see FIG. 3) is approximately equal to or longer than the length of the shortest side of the weight 15 (ie, the dimension in the front-rear direction). Thereby, the effective length of the weight guide portion WG can be ensured sufficiently, and the weight 15 can be stably supported by the weight guide portion WG.

Further, FIGS. 11 to 13 show modified examples of the weight guide portion WG that constitutes the movement restricting means for the weight 15. In FIGS. For example, in the first modified example shown in FIG. 2. The weight 15 is provided in a protruding manner to avoid the third elastic members S2 and S3, and the upper and lower end surfaces of the weight 15 are brought into contact with these weight guide portions WG so as to be able to slide back and forth, left and right, respectively. This restricts vertical movement of the weight 15.

In the second modified example shown in (b), the first elastic member S1, which is wound and fixed around the outer surface of the weight 15, is divided into upper and lower parts, and is attached to each pair of upper and lower and left and right weight guide parts WG. The upper and lower end surfaces and left and right side surfaces of the weight 15 are brought into contact with each other so as to be slidable back and forth. This restricts the movement of the weight 15 in the vertical and horizontal directions.

Further, the third modification shown in (c) is obtained by omitting the first elastic member S1 on one of the upper and lower sides in the second modification shown in (b).

In addition, in the fourth modification shown in (d), the pair of upper and lower weight guide parts WG in the third modification shown in (c) is omitted, and the left and right sides of the weight are moved back and forth by the pair of left and right weight guide parts WG. and are brought into contact so as to be able to slide up and down. This restricts movement of the weight 15 in the left-right direction.

Further, in the fifth modification shown in (e), the first elastic member S1 is wound and fixed around the horizontal axis in the left-right direction around the weight 15, while the damper case 17 (i.e., the first and second case halves 1A) A pair of left and right weight guide portions WG is protruded from the inner surface of the left and right side walls of either one or both of the left and right side walls, avoiding the second and third elastic members S2 and S3. The left and right sides of the base are slidably in contact with each other in the front and rear and up and down directions. This restricts movement of the weight 15 in the left-right direction.

Furthermore, in the sixth modification shown in (f), the arrangement of the weight 15 and the elastic members S1 to S3 of the embodiment shown in FIGS. 1 to 6 is angularly displaced by 90 degrees around the front-rear center line of the dynamic damper D. corresponds to something. In this case, the movement of the weight 15 in the left-right direction is regulated by the weight guide part WG, that is, the weight 15 is supported by the weight guide part WG so as to be slidable up and down and back and forth. This restricts movement of the weight 15 in the left-right direction.

Further, in the seventh modification shown in (g), the weight guide portion WG extends in the front-back direction on the inner surface of the front and rear side walls of the damper case 17 (that is, either one or both of the first and second case halves 1A). It consists of a support pin protruding from the top. That is, the upper and lower intermediate portions of the weight 15 are fitted and supported by the support pin WG so as to be able to slide back and forth without play, and the support pin WG restricts vertical and horizontal movement of the weight 15.

In each modification shown in FIGS. 11 to 13, the friction reducing member 70 is omitted except for the sixth modification shown in FIG. However, in each modification other than the sixth modification, the second and third elastic members S2 and S3 may be pressed and fixed to the inner surface of the damper case 17 via the friction reducing member 70. good.

Next, the operation of the first embodiment will be explained.

In the assembly procedure of the dynamic damper D, first, the first elastic member S1 is wound and fixed (for example, by gluing) around one upper and lower end surface of the weight 15 and the outer surface between the other end surface, and then The second and third elastic members S2 and S3 are respectively bonded (eg, bonded) to the other end surface, and the weight/elastic member assembly is assembled into a small assembly. Then, the damper case 17 is assembled by sandwiching this assembly between the opposing surfaces of the first and second case halves 17A and 17B, and removably connecting the mating surfaces of both case halves 17A and 17B. .

In this case, the second and third elastic members S2 and S3 move the damper case 17 (first and second case halves 17A and 17B) up and down through the friction reducing member 70 while being compressed and deformed up and down. The first elastic member S1 is press-fitted and fitted into the inner surface of the side wall, and the front and rear side surfaces and left and right side surfaces of the first elastic member S1 are respectively fitted to the front and rear and left and right side wall inner surfaces of the damper case 17 (first and second case halves 17A and 17B). They face each other with gaps 91 and 92 in between.

The dynamic damper D thus assembled is set together with the skin 14 in the cavity of a mold (not shown) for injection molding the cushion member 13 of the headrest 4, and the cushion member 13 is injection molded in this set state. At the same time, the dynamic damper D is integrally buried at a predetermined position within the cushion member 13.

While the car is running, when vibrations from the car are transmitted from the floor F to the seat back 3 and headrest 4 via the seat cushion 2 and pivot 9, the weight 15 in the dynamic damper D mainly moves to the second and third elastic members S2 and S3. The seat back 3 and the headrest 4 can be damped by resonating with elastic deformation and absorbing the vibration energy of the seat back 3 and the headrest 4 instead.

In such a dynamic damper D, the weight 15 is formed into a polyhedron (approximately rectangular parallelepiped shape), and the weight 15 is covered and supported by sheet-like elastic members S1 to S3 that have been previously formed to a desired thickness. An elastic member having a desired thickness can be extremely easily formed on the outer surface of the weight 15, and a dynamic damper D having stable vibration damping characteristics can be provided at low cost.

Furthermore, in the dynamic damper D of the embodiment, since the weight guide portion WG is provided as a movement regulating means for regulating the movement of the weight 15 in a predetermined direction (for example, the vertical direction), the movement of the weight 15 in the predetermined direction is is regulated, and unnecessary movement of the weight in the predetermined direction is suppressed. As a result, the dynamic damper D can efficiently exert a damping effect on vibrations in specific directions (for example, front, back, left, and right directions) that should originally be damped, and can also optimize the damping mode according to the form of vibration to be damped. (tuning) becomes easy.

Further, even if the vertical movement of the weight 15 is restricted, it can still move (and therefore vibrate) back and forth and left and right, and at this time, the second and third elastic members S2 and S3, which have relatively high hardness, Since the dynamic damper D stably vibrates in the longitudinal and lateral directions with elastic deformation, the dynamic damper D can effectively suppress vibrations in the longitudinal and lateral directions.

Further, in this embodiment, the weight guide portion WG that slides and guides the weight 15 in the specific direction also serves as the movement regulating means, which simplifies the structure and further reduces costs.

Further, when the first elastic member S1 of this embodiment is set in the damper case 17 together with the weight 15, there is a slight gap 91, 92 between the front and rear side wall inner surfaces and the left and right side wall inner surfaces of the damper case 17. Set. When the weight 15 vibrates back and forth or left and right as described above, the front and rear sides or left and right sides of the first elastic member S collide with the inner surface of the damper case 17 so as to fill the gaps 91 and 92. However, the impact at that time is absorbed and alleviated by the elastic deformation of the first elastic member S.

On the other hand, if the first elastic member S1 is omitted, there is a risk that when the weight 15 vibrates back and forth and left and right, it will directly collide with the inner surface of the damper case 17, causing an unpleasant collision sound. In this embodiment, the occurrence of unpleasant collision noise can be effectively prevented by the above-mentioned buffering effect provided by the first elastic member S1.

Note that the first elastic member S is elastically compressed if the weight 15 still vibrates in the front-rear or left-right direction after its front and rear sides and left and right sides contact the inner surface of the damper case 17 as described above. By deforming, elastic resistance can be applied to the weight 15.

In the present embodiment, the corner E where at least one upper and lower end surface of the weight 15 and the first and second side surfaces (front side, left and right side surfaces) that are continuous with the one end surface and adjacent to each other are assembled. At least part of the corner E of the damper case 17 is visible when the weight 15 is assembled into the damper case 17. Thereby, when assembling the weight 15, the weight corner E can be directly and easily aligned with the inner surface of the damper case 15, so that the weight 15 can be easily aligned into the damper case 17. Assembling workability and, by extension, the assembling workability of the dynamic damper D can be improved. Moreover, by checking the corner E of the weight 15 before assembling the weight 15 into the damper case 17, it is easy to confirm in advance the state of attachment of the first elastic member S1 to the end E of the weight. As a result, assembly work efficiency is further improved.

Further, in the present embodiment, the elastic members S1 to S3 that cover the weight 15 include the first elastic member S1 that covers the entire outer surface of the weight 15, and the first elastic member S1 that covers the entire outer surface of the weight 15, and the first elastic member S1 that covers one end surface and the other end surface of the weight 15, respectively. It is divided into second and third covering elastic members S2 and S3. As a result, the form of each elastic member S1 to S3 can be simplified as much as possible and the moldability is better than when the weight 15 is covered with a single sheet-like elastic member. Moreover, since it is possible to easily change the material, thickness, etc. of the elastic materials constituting the first elastic member S1 and the second and third elastic members S2 and S3, the first elastic member The material, hardness, thickness, etc. of each of the elastic members S1 to S3 can be selected so that the elastic member S1 and the second and third elastic members S2 and S3 can each exhibit an optimal dynamic damper effect.

Further, FIG. 14 shows a second embodiment, in which a dynamic damper D is attached to the left and right upper bone members 12b, 12b of the headrest frame 12. That is, the first and second elastic support parts 24A, 24B of the damper case 17 are snap-engaged with the left and right upper bone members 12b, 12b from above, and the positioning support part 30 is connected to the left and right upper bone members 12b, 12b. It abuts and engages from below with a cross member 46 that connects the rear ends. The rest of the configuration is the same as that of the first embodiment, so in FIG. 10, the same reference numerals are given to the parts corresponding to those of the first embodiment, and redundant explanation will be omitted.

According to the second embodiment, by effectively utilizing the space between the left and right upper bone members 12b, 12b for installing the dynamic damper D, the front part of the cushion member 13 of the headrest 4 that the occupant's head contacts is It is possible to enhance the vibration damping function of the dynamic damper D by ensuring a sufficient wall thickness, and by obtaining a sufficient distance 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. can.

Further, FIG. 15 shows a third embodiment, in which the seat back 3 has a substantially right triangular shape in the inner corner of the left and right corners of the upper part of the seat back frame 10 when viewed from the front. A dynamic damper D including a damper case 17 is arranged, and a pair of elastic support parts 24A and 24B formed on the upper surface and one side of the damper case 17 are attached to the vertical bone member 10a and the horizontal bone member 10b of the seat back frame 10. They are each snapped together. The structure of the dynamic damper D is basically the same as that of the first embodiment, except for the shapes of the damper case 17 and the weight 15 housed therein.

According to the third embodiment, the vibration of the seat back 3 can be effectively damped by the action of the dynamic damper D disposed at the top of the seat back frame 10. Moreover, the dead space at the inner corner of the upper corner of the seat back frame 10 can be effectively used for installing the dynamic damper D. Note that the dynamic damper D may be disposed only at the inner corner of either the left or right corner of the upper portion of the seat back frame 10.

Further, FIG. 16 shows a fourth embodiment, in which the left and right vertical rib members 10a, 10a of the seat back frame 10 are mutually connected at the center part of a wavy rib member 49 that integrally connects the upper portions of the vertical rib members 10a, 10a. A pair of elastic support portions 24A, 24B formed on both left and right side surfaces of the damper case 17 are snap-engaged with a pair of inclined rib portions 49a, 49a inclined in opposite directions, respectively. At this time, the pair of elastic support parts 24A, 24B are arranged obliquely corresponding to the pair of inclined bone parts 49a, 49a, so that the pair of elastic support parts 24A, 24B are arranged diagonally in correspondence with the pair of inclined bone parts 49a, 49a. vertical movement is prevented. The basic structure of the dynamic damper D is the same as that of the first embodiment. In this way, the vibration of the seat back 3 can be effectively damped by the action of the single dynamic damper D attached to the upper and central portion of the seat back frame 10.

Further, FIG. 17 shows a fifth embodiment, in which a front reinforcing plate 6a is welded to the front part of the seat cushion frame 6 and extends in the left-right direction to damp the vibration of the seat cushion 2. The damper case 17 of the dynamic damper D is attached to the damper case 17 of the dynamic damper D. In this case, the damper case 17 has a pair of elastic support parts 50, 50 formed on its upper surface. Each elastic support part 50 is composed of a shaft part 50a protruding from the outer surface of the damper case 17, and an arrowhead-shaped locking protrusion 50b formed at the tip of the shaft part 50a. In order to enable diameter reduction, a slit 50c is provided extending from the tip of the locking protrusion 50b to the shaft portion 50a. Further, an elastic collar 52 made of rubber is fitted onto the shaft portion 50a. On the other hand, a pair of locking holes 51, 51 are bored in the front reinforcing plate 6a, corresponding to the pair of elastic support sections 50, 50, and the elastic support sections 50, 50 are inserted into these locking holes 51, 51. By pushing in the locking protrusions 50b from below, each locking protrusion 50b does not elastically contract in diameter, but after passing through the corresponding locking hole 51, the diameter expands to its original shape, that is, it snaps and locks. Separation from the hole 51 is prevented. At this time, the elastic collar 52 fitted to the shaft portion 50a is compressed between the front reinforcing plate 6a and the damper case 17, and the repulsive force causes the locking protrusion 50b to play against the front surface of the front reinforcing plate 6a. is retained without any Other than the elastic support parts 50, 50, the structures of the damper case 17, the weight 15 housed therein, and the sheet-like elastic members S1 to S3 covering it are basically the same as those of the first embodiment. Therefore, in FIG. 17, parts corresponding to those in the first embodiment are given the same reference numerals, and redundant explanation will be omitted.

According to the fifth embodiment, the vibration of the seat cushion 2 can be effectively damped by the action of the dynamic damper D disposed at the front end of the seat cushion frame 6. Moreover, the dead space below the front reinforcing plate 6a at the front end of the seat cushion frame 6 can be effectively used for installing the dynamic damper D, and furthermore, by a simple pushing operation, the elastic supporting parts 50, 50 can be moved to the front reinforcing plate 6a. It can be snapped into the locking holes 51, 51, and the damper case 17 can be easily attached.

Further, FIG. 18 shows a sixth embodiment, in which the damper case 17 is not provided with an elastic support part, and the damper case 17 is attached to a cushion member 13 that is harder than the sheet-like elastic members S1 to S3. The rest of the configuration is the same as that of the first embodiment, so in FIG. Omitted.

According to the sixth embodiment, the structure of the dynamic damper D can be simplified because the damper case 17 is not provided with an elastic support section. When embedding the damper case 17 in the cushion member 13 made of foam material, the damper case 17 is hung from the headrest frame 12 with a thread and held in a predetermined position, and after the cushion member 13 is formed, the thread is cut. become.

Further, FIG. 19 shows a seventh embodiment. In each of the previous embodiments, the weight 15 and the weight guide WG contact and engage with each other in the vertical direction (that is, directly contact each other so as to be slidable in the front, back, left, and right directions). In this embodiment, a slight gap 93 is set in the vertical direction between the weight 15 and the weight guide part WG, and the weight 15 can be slightly vertically displaced with respect to the damper case 17 within the range of the gap 93. ing.

The rest of the configuration of the seventh embodiment is the same as that of the first embodiment, so each component is given the same reference numeral as the corresponding component of the first embodiment, and further explanation is omitted. do. Thus, the seventh embodiment can also achieve basically the same effects as the first embodiment.

Furthermore, in the seventh embodiment, a slight gap 93 is set in the vertical direction between the weight 15 and the weight guide portion WG, so that the weight 15 can prevent the elastic deformation of the second and third elastic members S2 and S3. In the process of vibrating back and forth or from side to side, the weight 15 does not receive greater sliding resistance than the weight guide portion WG due to the existence of the gap 93, and the damper characteristics of the dynamic damper D during the rise can be stabilized. can. Furthermore, when the weight 15 is strongly vibrated in the vertical direction, the weight 15 comes into contact with the weight guide part WG so as to close the gap 93, so that further movement in the vertical direction is restricted. Ru. In this case as well, movement of the weight 15 in the front-back and left-right directions is allowed because the weight 15 slides into contact with the weight guide portion WG in the front-back and left-right directions.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the gist thereof.

For example, at least one of the third to fifth embodiments can be used in combination with the first or second embodiment.

Further, one of the first and second halves 17A and 17B constituting the damper case 17 can be formed into a box shape having an opening, and the other half can be formed into a lid shape that closes the opening.

Furthermore, the vehicle seat 1 of the present invention is applicable not only to automobiles but also to railway vehicles, aircraft, and the like. Further, the seat 1 can also be installed so as to protrude from the wall surface of the vehicle.

Furthermore, in the embodiment described above, the vertical movement of the weight 15 is restricted by the weight guide WG (movement restriction means), but the movement restriction direction can be set arbitrarily depending on the vibration damping target. For example, as shown in FIGS. 11(b) and 11(c) and FIGS. 12(d) to (f), the horizontal movement of the weight 15 may be restricted, or Although this is not the case, the movement of the weight 15 in the back and forth direction may be restricted.

Furthermore, in the embodiment described above, the elastic members S1 to S3 are molded into a sheet shape and covered and fixed to the weight 15 afterward. However, in the present invention, the elastic members are integrally molded around the weight 15. You can do it like this.

Furthermore, in the embodiment described above, the headrest 4, which is a separate part, is attached to the seatback 3 afterward. It may also be implemented as

Further, in the embodiment described above, the dynamic damper D is provided with a movement regulating means (weight guide section WG) that regulates the movement of the weight 15 in a predetermined direction (vertical direction). The regulating means may be omitted and the weight 15 may be configured to be movable in all directions, front, back, left, right, up and down.

C...End shape C' as corner confirmation means Notch D as corner confirmation means Dynamic damper E...Corner S1 ~S3... First to third elastic members S1c as elastic members... Bending portion WG... Weight guide portion 1 as movement regulating means... Automobile as a vehicle seat Seat 2...Seat cushion 3...Seat back 4...Headrest 6...Seat cushion frame 10...As a frame Seat back frame 12... Headrest frame 13 as a frame... Cushion member 15... Weight 17... Damper case 70... Friction reducing member 81... ...Thin wall portion 82 as a means for easy bending...Small hole as a means for easy bending

Claims (11)

A weight (15), an elastic member (S1 to S3) that vibrably supports the weight (15), and a damper case (17) that stores the weight (15) and the elastic member (S1 to S3). ) in a dynamic damper equipped with
At least one corner (E) of the corner (E) where at least one end surface of the weight (15) and first and second side surfaces that are continuous to the one end surface and mutually adjacent to each other are assembled; ) is provided with a corner confirmation means (C, C') for confirming the
The elastic member includes a first elastic member (S1) that covers substantially the entire outer surface between one end surface and the other end surface of the weight (15), and one end surface and the other end surface of the weight (15). second and third elastic members (S2, S3) respectively coupled to the inner surface of the damper case (17);
The corner confirmation means is formed on the first elastic member (S1) so as to expose at least some of the corners (E) of the plurality of corners (E) of the weight (15). A dynamic damper comprising a notch (C') . A weight (15), an elastic member (S1 to S3) that vibrably supports the weight (15), and a damper case (17) that stores the weight (15) and the elastic member (S1 to S3). ) in a dynamic damper equipped with
At least one corner (E) of the corner (E) where at least one end surface of the weight (15) and first and second side surfaces that are continuous to the one end surface and mutually adjacent to each other are assembled; ) is provided with a corner confirmation means (C, C') for confirming the
The elastic member includes a first elastic member (S1) that covers substantially the entire outer surface between one end surface and the other end surface of the weight (15), and one end surface and the other end surface of the weight (15). second and third elastic members (S2, S3) respectively coupled to the inner surface of the damper case (17);
The weight (15) is formed to have a polygonal cross section, and the first elastic member (S1) has a bent portion (S1c) corresponding to a corner of a side surface of the weight (15),
The bending portion (S1c) is provided with bending facilitating means (81, 82) for making bending of the first elastic member (S1) easier than in a portion other than the bending portion. dynamic damper. A weight (15), an elastic member (S1 to S3) that vibrably supports the weight (15), and a damper case (17) that stores the weight (15) and the elastic member (S1 to S3). ) in a dynamic damper equipped with
At least one corner (E) of the corner (E) where at least one end surface of the weight (15) and first and second side surfaces that are continuous to the one end surface and mutually adjacent to each other are assembled; ) is provided with a corner confirmation means (C, C') for confirming the
The elastic member includes a first elastic member (S1) that covers substantially the entire outer surface between one end surface and the other end surface of the weight (15), and one end surface and the other end surface of the weight (15). second and third elastic members (S2, S3) respectively coupled to the inner surface of the damper case (17);
A friction reducing member (70) is attached to the second and third elastic members (S2, S3), and the friction reducing member (70) is located on the opposite side of the weight (15) and comes into contact with the inner surface of the damper case (17). ,
The second and third elastic members (S2, S3) are arranged in a compressed state between the friction reducing member (70) and the weight (15) within the damper case (17). Dynamic damper. The first elastic member (S1) is formed in an end shape (C) that exposes at least one end of the weight (15) including at least two of the corners (E); 4. The dynamic damper according to claim 2 , wherein the shape (C) constitutes the corner confirmation means. The weight (15) is formed to have a polygonal cross section, and the first elastic member (S1) has a bent portion (S1c) corresponding to a corner of a side surface of the weight (15),
The bending part (S1c) is characterized by being provided with bending facilitating means (81, 82) for making the bending of the first elastic member (S1) easier than in other parts of the bending part (S1c). , The dynamic damper according to claim 1 or 3 . A friction reducing member (70) is attached to the second and third elastic members (S2, S3), and the friction reducing member (70) is located on the opposite side of the weight (15) and comes into contact with the inner surface of the damper case (17). ,
The second and third elastic members (S2, S3) are arranged in a compressed state between the friction reducing member (70) and the weight (15) within the damper case (17). The dynamic damper according to claim 1 . The bending-facilitating means is characterized in that it is comprised of a thin part (81) formed in a part of the first elastic member (S1) corresponding to a corner of a side surface of the weight (15). Dynamic damper according to claim 2 or 5 . Any one of claims 1 to 7, wherein the first elastic member (S1) is arranged apart from at least one of the second and third elastic members (S2, S3). Dynamic damper as described in Section. Any one of claims 1 to 8, wherein the first elastic member (S1) and the second and third elastic members (S2, S3) are made of different elastic materials. Dynamic damper described in. A headrest comprising the dynamic damper according to any one of claims 1 to 9, wherein the damper case (17) is held by a frame (12) or a cushion member (13) of the headrest (4). A headrest featuring. A vehicle seat equipped with a dynamic damper according to any one of claims 1 to 9, wherein the damper case (17) is attached to a frame of at least one of a seat back (3) and a seat cushion (2). (6, 10) or a cushion member (13).

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