JP2010228493A - Vehicular seat with headrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat capable of damping vibration of a seat by a lightweight mass body. <P>SOLUTION: This vehicular seat 1 has a headrest 3 installed in a seat back 2. The headrest 3 has a frame body 3a1, a stay 3a2 extending from the frame body 3a1 and installed on a bracket 2d of the seat back 2, and the mass body 5 immovably installed in a frame upper part 3a3 of the frame body 3a1 positioned in the upper part vicinity of the headrest 3. When the seat back 2 vibrates, the headrest 3 can swing to the seat back 2 by a clearance between the stay 3a2 and the bracket 2d together with the mass body 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle seat mounted on a vehicle such as an automobile.

  A vehicle seat generally includes a seat cushion, a seat back standing at the rear portion of the seat cushion, and a headrest attached to an upper portion of the seat back. Conventionally, the headrest is, for example, a pair of stays extending downward and attached to the seat back, an annular frame body provided on the upper part of the stay, and a mass body supported by the frame body via a spring at the center of the frame body. (See Patent Document 1). Accordingly, when the seat resonates with the vibration of the vehicle body and vibrates in the left-right direction when the vehicle travels, the mass body can vibrate in the left-right direction with respect to the frame main body to attenuate the vibration of the seat. Thereby, the riding comfort of the seat can be improved.

JP-A-10-226255

  However, there is a desire to reduce the weight of the seat. Then, this invention makes it a subject to provide the vehicle seat which can attenuate the vibration of a seat with a lightweight mass body.

  In order to solve the above-mentioned problems, the present invention is a vehicle seat having a configuration as described in each claim. According to the first aspect of the invention, the headrest is attached to the frame main body, the stay extending from the frame main body and attached to the bracket of the seat back, and the frame rest on the upper portion of the frame main body located near the upper portion of the headrest. It has a mass body. When the seat back vibrates, the headrest can swing with respect to the seat back due to the gap between the stay and the bracket together with the mass body.

  Therefore, when the seat back vibrates, the headrest can swing with respect to the seat back together with the mass body. Thereby, the vibration of the seat back can be attenuated. Further, when the seat back vibrates, the seat back vibrates around an attachment portion (anchor etc.) between the vehicle main body and the seat. On the other hand, the mass body is located near the top of the headrest. Therefore, the mass body is farther from the attachment portion than in the case where it is provided at the center of the headrest, and a large torque is likely to be generated in the seat back. Therefore, even if the mass body is light, a predetermined vibration damping effect can be obtained. Thus, the weight of the seat can be reduced. The mass body is attached to the frame body of the headrest so as not to move. Therefore, the mass body can be easily attached to the frame body as compared with the conventional structure in which the mass body is attached to the frame body so as to be able to vibrate.

  According to the invention described in claim 2, the frame body of the headrest has a pair of vertical frame portions extending upward from the pair of stays and an upper portion of the frame connecting the upper portions of the vertical frame portions in a substantially horizontal direction. is doing. The mass body has an attachment portion attached to the upper portion of the frame by welding, and a hanging portion extending from the attachment portion to the side of the vertical frame portion and extending downward while being curved.

  Therefore, since the mass body is welded to the frame body, the mass body can be attached with fewer parts than when the mass body is attached to the frame body with bolts or the like. The hanging portion of the mass body extends sideways and downward while being curved. Therefore, the force when the headrest receives a force from the side can be dispersed vertically by the hanging part. Thus, the mass body is hardly recognized as a foreign object from the outside of the headrest.

It is a partial perspective view of a vehicle seat. It is a front view of a part of seat back and a headrest. It is a left view of a part of seat back and a headrest.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the vehicle seat 1 is a seat mounted on a vehicle such as an automobile, and includes a seat cushion 4, a seat back 2, and a headrest 3. A reclining device 6 is provided between the seat cushion 4 and the seat back 2 to connect them so that the angle can be adjusted.

  As shown in FIG. 1, the seat back 2, the headrest 3, and the seat cushion 4 have frames 2 a to 4 a, pads 2 b to 4 b that are attached to the frames 2 a to 4 a, and skins 2 c to 4 c that cover the pads 2 b to 4 b, respectively. Have. The back frame 2a of the seat back 2 has a pair of left and right side frames 2a1, an upper frame 2a2 that connects the upper portions of the side frames 2a1, and an under frame 2a3 that connects the lower portions of the side frames 2a1.

  A pair of brackets 2d are attached to the upper frame 2a2 as shown in FIGS. The bracket 2d is made of metal and has a cylindrical shape with a square cross section. A resin support member 2e is inserted into the bracket 2d. The support member 2e has a cylindrical main body 2e1 and a head 2e2 larger than the diameter of the bracket 2d. The main body 2e1 is inserted into the bracket 2d, and the head 2e2 is brought into contact with the upper end of the bracket 2d. An attachment hole 2e3 penetrating vertically is formed in the support member 2e, and the stay 3a2 of the headrest 3 is inserted into the attachment hole 2e3.

  As shown in FIGS. 2 and 3, the headrest 3 has a frame 3a formed from a pipe material (hollow member) and a pair of mass bodies 5 formed from a solid member attached to the frame 3a. The frame 3a has a frame body 3a1 and a pair of stays 3a2 extending downward from the frame body 3a1. The frame main body 3a1 has vertical frame portions 3a4 and 3a5 extending upward from the respective stays 3a2. The first vertical frame portion 3a4 extends obliquely from the stay 3a2 to the front upper side and obliquely extends in the left-right center direction. The second vertical frame portion 3a5 extends upward from the first vertical frame portion 3a4 and is gently inclined rearward. The upper end portion of the second vertical frame portion 3a5 is connected by a frame upper portion 3a3 extending in a substantially horizontal direction.

  The stay 3a2 extends downward from the first vertical frame portion 3a4 as shown in FIGS. 2 and 3, and is inserted into the support member 2e. The stay 3a2 is held at a predetermined position with respect to the support member 2e by a position adjusting mechanism (not shown). Therefore, the position of the headrest 3 can be adjusted up and down with respect to the seat back 2 by the position adjustment mechanism. A gap 7a may be formed between the stay 3a2 and the support member 2e. A gap 7b can be formed between the support member 2e and the bracket 2d. Accordingly, the headrest 3 can swing in the front-rear direction or the left-right direction with respect to the seat back 2 by one or both of the gaps 7a, 7b.

  As shown in FIG. 2, the mass body 5 is made of metal such as steel and is solid, and is heavier than the weight per unit volume of the frame 3a. The mass body 5 is a round bar having a diameter of 10 to 20 mm, extends in a substantially U shape, and has a mounting portion 5a, a hanging portion 5b, and a tip portion 5c. The attachment portion 5a extends in a substantially horizontal direction along the frame upper portion 3a3, and is attached to the rear surface of the frame upper portion 3a3 so as to be immovable by welding. That is, the mass body 5 is attached to the uppermost part of the frame 3 a and is located near the upper end part of the headrest 3.

  As shown in FIGS. 2 and 3, the drooping portion 5 b extends from the mounting portion 5 a while curving downward on the side of the headrest 3. The hanging portion 5b extends from the mounting portion 5a in a substantially semicircular shape, and the outer peripheral surface has a radius of 15 to 30 mm. The hanging part 5b is located in the upper third of the headrest 3 and above the upper half of the second vertical frame part 3a5. The hanging portion 5b is located on the side of the second vertical frame portion 3a5, and is located on the left and right center side of the first vertical frame portion 3a4.

  As shown in FIGS. 2 and 3, the distal end portion 5 c extends from the hanging portion 5 b in a substantially horizontal direction. The tip portion 5 c extends from the vicinity of the second vertical frame portion 3 a 5 to the vicinity of the center of the left and right of the headrest 3 and is close to the tip portion 5 c of the other mass body 5. The front end 5c and the hanging part 5b have a gap 5d in the front-rear direction between the frame body 3a1. Therefore, even when the mass body 5 is slightly shaken with respect to the frame 3a, it is possible to prevent the mass body 5 from hitting the frame 3a, and it is possible to prevent the generation of abnormal noise that may be generated by hitting.

  The vehicle vibrates due to unevenness on the road surface when traveling, and the vehicle body vibrates. The vibration of the vehicle main body is transmitted to the seat 1, and the seat back 2 vibrates around an attachment portion (anchor) with the vehicle main body. On the other hand, the headrest 3 can apply a force in a direction not to vibrate to the seat back 2 by using the gaps 7 a and 7 b with the seat back 2 by the inertial force together with the mass body 5. Therefore, the headrest 3 and the mass body 5 can swing relative to the seat back 2 so that vibration can be absorbed with respect to the seat back 2.

  As described above, the headrest 3 has the frame body 3a1, the stay 3a2, and the mass body 5 as shown in FIG. When the seat back 2 vibrates, the headrest 3 can swing with respect to the seat back 2 by the gaps 7 a and 7 b between the stay 3 a 2 and the bracket 2 d together with the mass body 5.

  Therefore, when the seat back 2 vibrates, the headrest 3 can swing with respect to the seat back 2 together with the mass body 5. Thereby, the vibration of the seat back 2 can be attenuated. Further, when the seat back 2 vibrates, the seat back 2 vibrates around a mounting portion (anchor or the like) between the vehicle main body and the seat 1. On the other hand, the mass body 5 is located near the upper part of the headrest 3. Therefore, the mass body 5 is farther from the attachment portion than the case where the mass body is provided in the center of the headrest 3, and a large torque is easily generated in the seat back 2. Therefore, even if the mass body 5 is light, a predetermined vibration damping effect can be obtained. Thus, the weight of the seat 1 can be reduced. The mass body 5 is attached to the frame body 3a1 of the headrest 3 so as not to move. Therefore, the mass body 5 can be easily attached to the frame body 3a1 as compared with the conventional structure in which the mass body is attached to the frame body so as to be able to vibrate.

  The frame body 3a1 has vertical frame portions 3a4 and 3a5 and a frame upper portion 3a3 as shown in FIG. The mass body 5 has an attachment portion 5a attached to the frame upper portion 3a3 by welding, and a hanging portion 5b extending from the attachment portion 5a to the side of the vertical frame portion 3a5 and extending downward while being curved. .

  Therefore, since the mass body 5 is welded to the frame main body 3a1, the mass body 5 can be attached with a smaller number of parts than when the mass body 5 is attached to the frame main body 3a1 with bolts or the like. The hanging portion 5b of the mass body 5 extends sideward and downward while being curved. Therefore, the force when the headrest 3 receives a force from the side can be dispersed in the vertical direction by the hanging portion 5b. Thus, the mass body 5 is hardly recognized as a foreign object from the outside of the headrest 3.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and may be the following form.
(1) The frame 3a shown in FIG. 2 has a frame upper portion 3a3 extending in a substantially horizontal direction. However, the upper part of the frame may extend in a substantially arc shape, and the mass body may be attached to the uppermost arc part of the upper part of the frame. Or the frame upper part 3a3 is not provided, but the mass body 5 may be attached to the uppermost part of the vertical frame part 3a5.
(2) A pair of mass bodies 5 are provided on the frame 3a shown in FIG. However, one or three or more mass bodies may be provided on the frame, and the total weight of the mass bodies 5 may be adjusted according to the resonance natural vibration for each vehicle type.
(3) The mass body 5 shown in FIG. 2 has the attachment part 5a, the drooping part 5b, and the front-end | tip part 5c. However, the mass body 5 may have only the attachment portion 5a without the tip portion 5c and only the attachment portion 5a and the hanging portion 5b, or may have only the attachment portion 5a without the hanging portion 5b and the tip portion 5c.
(4) The mass body 5 shown in FIG. 3 is attached to the frame 3a by welding. However, the mass body may be attached to the frame so as to be immovable by bolts and screws.
(5) The headrest 3 shown in FIG. 2 swings relative to the seat back 2 using the gaps 7a and 7b. However, only one of the gaps 7a and 7b may be formed, and the headrest 3 may vibrate relative to the seat back 2 due to the gap.

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat 2 ... Seat back 2a ... Back frame 2d ... Bracket 2e ... Support member 3 ... Headrest 3a ... Frame 3a1 ... Frame main body 3a2 ... Stay 3a3 ... Frame upper part 3a4, 3a5 ... Vertical frame part 4 ... Seat cushion 5 ... Mass body 5a ... Mounting portion 5b ... Drooping portion 5c ... Tip portions 7a, 7b ... Gap

Claims (2)

A vehicle seat with a headrest having a headrest attached to a seat back,
The headrest has a frame main body, a stay extending from the frame main body and attached to the bracket of the seat back, and a mass body attached immovably to the upper portion of the frame main body located near the upper portion of the headrest. And
When the seat back vibrates, the headrest can swing with respect to the seat back by the gap between the stay and the bracket together with the mass body. The vehicle seat with a headrest according to claim 1,
The frame body of the headrest has a pair of vertical frame portions extending upward from each pair of stays, and a frame upper portion connecting the upper portions of the vertical frame portions in a substantially horizontal direction,
The mass body has an attachment part attached to the upper part of the frame by welding, and a hanging part that extends from the attachment part to the side of the vertical frame part and extends downward while being curved. Vehicle seat with.

Images