JP2013103550A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat having a headrest movably disposed between inside a seat back and above the seat back, in which the headrest can be easily moved to a use position.SOLUTION: A headrest 40 disposed being vertically movable with respect to a seat back 30 is stored in a storage recess 35 (storage position P0) formed by partially denting an outer shape in an upper end of the seat back 30, when the headrest 40 is moved to the lowest position. A cushion spring 24 of a seat cushion 20 is mechanically connected to the headrest 40 by a wire 50 arranged in a seat 10; and when the cushion spring 24 yields to the lower side by the load of a seated person S, the headrest 40 is taken out up to a use position P1, P2 in accordance with the yielding amount. Meanwhile, the headrest 40 is biased toward the storage position P0 by a biasing member, and thereby, when yielding of the cushion spring 24 is removed, the headrest 40 is pulled back to the storage position P0.

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat in which a headrest is movably provided between a storage position in a seat back and a use position above the seat back.

  The headrest provided on the upper part of the vehicle seat is not necessary when the seated person is not seated, and obstructs the field of view when the driver visually recognizes backward. In view of this, a vehicle seat that can be stored in a seat back when the headrest is not used is conventionally known. Such a vehicle seat is disclosed in, for example, Patent Document 1 below.

Japanese Utility Model Publication No. 63-189033

  However, according to the technique disclosed in Patent Document 1, it is necessary to move the headrest by manually operating the knob by the seated person, which is not convenient.

  The present invention has been made in view of such problems, and the problem to be solved by the present invention is that the headrest can move between a storage position in the seat back and a use position above the seat back. In the vehicle seat provided, the headrest is simply moved to the use position.

In order to solve the above problems, the vehicle seat according to the present invention takes the following means.
A vehicle seat according to a first aspect of the present invention includes a seat cushion on which a seated person is seated, a seat back that is a backrest of the seated person, and a headrest that supports the head of the seated person. In the vehicle seat provided so as to be movable between a retracted position in the seat back and a use position above the seat back, the seat cushion is subjected to bending deformation of a portion bent by a seating load of the seated person. A detecting mechanism for detecting the bending deformation operation detected by the detecting mechanism provided in the seat cushion is connected to the headrest through a mechanical transmission mechanism such as a wire as an operation for moving the headrest. In addition, the transmission connection by the mechanical transmission mechanism is such that the headrest is seated by a load that a seated person sits on the seat cushion. Characterized in that the storage position of Tsu the click is a transmission connected to be operated in the use position the direction of the seat back upper.
According to this configuration, when the seated person sits on the seat cushion, the detection mechanism detects the bending deformation of the seat cushion due to the load, and the mechanical transmission mechanism transmits the bending deformation operation as the movement operation of the headrest. Is moved from the retracted position in the seat back to the use position above the seat back. Therefore, the headrest can be easily moved to the use position above the seat back only by the seated person sitting on the seat cushion.

A vehicle seat according to a second invention of the present invention is the vehicle seat according to the first invention, wherein the possible movement of the headrest is a vertical movement between the use position and the storage position. It is characterized by being.
According to this configuration, since the possible movement of the headrest is a vertical movement between the use position and the storage position, the present invention can be implemented with a simple structure.

A vehicle seat according to a third invention of the present invention is the vehicle seat according to the first or second invention, wherein the headrest is biased in the storage position direction by a biasing member. Features.
According to this configuration, when the seated person leaves the seat cushion, the spring member is restored to the original position and the wire is loosened, so that the headrest biased by the biasing member is moved to the retracted position. Therefore, the headrest can be easily moved to the retracted position in the seat back only by the seated person leaving the seat cushion.

A vehicle seat according to a fourth invention of the present invention is the vehicle seat according to any one of the first to third inventions, wherein the transmission connection by the mechanical transmission mechanism is in the use position direction of the headrest. It is the transmission connection structure which changes according to the load of the seated person who sits on the seat cushion.
According to this configuration, since the amount of movement of the headrest in the use position direction changes according to the load of the seated person sitting on the seat cushion, when the seated person sits on the seat cushion, the use position of the headrest is changed. It can be adjusted to the optimal position.

According to the first aspect of the present invention, the headrest can be easily moved to the use position above the seat back only by the seated person sitting on the seat cushion.
According to the second invention, the present invention can be implemented with a simple structure.
According to the third aspect of the present invention, the headrest can be easily moved to the retracted position in the seat back simply by leaving the seat occupant from the seat cushion.
According to the fourth aspect of the present invention, the seating person can adjust the use position of the headrest to the optimum position by sitting on the seat cushion.

It is the conceptual diagram which looked at the vehicle seat which concerns on embodiment from the left side. It is a perspective view which shows the state which has the headrest which concerns on embodiment in a storing position. It is a perspective view which shows the state which has the headrest which concerns on embodiment in a use position.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 shows a vehicle seat 10 provided in a vehicle and used by a passenger. The seat 10 includes a seat cushion 20 on which an occupant who is a seated person S sits, a seat back 30 that serves as a backrest for the seated person S, and a headrest 40 that supports the head of the seated person S. The seat back 30 is connected to a rear end portion of the seat cushion 20, and an angle with respect to the seat back 30 can be adjusted by a reclining device provided in the connecting portion. The headrest 40 is attached to the seat back 30 and has a configuration described in detail later. When the headrest 40 is not in use, the headrest 40 is moved to the storage position P0 and stored. It is possible to take out up to P2. By storing the unused headrest 40 in the seat back 30, the headrest 40 does not obstruct the field of view when the driver visually recognizes the rear.

  The seat cushion 20 includes a metal seat cushion frame 21 that forms the skeleton thereof. As shown in FIG. 1, the seat cushion frame 21 includes a front frame member 22 that forms the front side thereof, and a rear frame member 23 that forms the rear side. In the figure, structures other than the front frame member 22 and the rear frame member 23 are omitted. The seat cushion 20 also includes a pad material 28 having cushioning properties that covers the outside of the seat cushion frame 21 and a skin material 29 that covers the seat cushion frame 21 as members that form an outer shape including a seating surface. A cushion spring 24 is provided between the front frame member 22 and the rear frame member 23 so as to be bridged in the front-rear direction. The cushion spring 24 is a member having elasticity in at least the downward direction in a state of being spanned as described above. As a result, when the seated person S sits on the seating surface of the seat cushion 20, the cushion spring 24 is bent downward together with the pad material in accordance with the load. That is, the greater the seating load applied in the downward direction, the greater the downward deflection amount of the cushion spring 24.

The seat back 30 includes a metal seat back frame 31 that forms a skeleton thereof. As shown in FIGS. 2 and 3, the seat back frame 31 has an upper frame 32 that extends from the upper side to the upper side. A mounting frame 33 of the headrest 40 is provided on the left and right side portions of the upper frame 32 so as to be bridged. In the drawing, the lower structure of the seat back frame 31 is omitted. Two metal brackets 34 are fixed to the mounting frame 33. The bracket 34 has a cylindrical shape, and is welded to the left and right front surfaces of the mounting frame 33 in a state where the cylindrical shape is directed in the vertical direction.
On the other hand, the headrest 40 is supported by the bracket 34 via two metal stays 41 arranged on the left and right. The stay 41 has a bar shape and is provided so as to extend downward at the lower end of the headrest 40. The rod-shaped stay 41 is inserted into the cylindrical shape of the bracket 34 and is movable in the vertical direction with respect to the bracket 34. As a result, the headrest 40 can move up and down with respect to the seat back 30.
The seat back 30 also includes a pad material 38 having a cushioning property that covers the outside of the seat back frame 31 and a skin material 39 that covers the seat back frame 31 as members that form an outer shape including a backrest surface. The upper portion of the seat back 30 is provided with a storage recess 35 in which a member that forms the outer shape is partially recessed and the headrest 40 can be stored therein. When the headrest 40 is moved downward, it is stored in the storage recess 35 (storage position P0).

As will be described below, the seat 10 is provided with a mechanism that detects a deformation operation of a portion of the seat cushion 20 that is bent by the seating load of the seated person S and transmits the deformation operation as a movement operation of the headrest 40. ing. In the present embodiment, the deformation operation of the cushion spring 24 in the seat cushion 20 is detected. The cushion spring 24 is mechanically connected to the headrest 40 by a wire 50 arranged in the seat 10. That is, one end of the wire 50 is attached to a portion where the cushion spring 24 extending in the front-rear direction is bent, and the other end is attached to a wire attachment portion 43 provided on the side portion of the headrest 40.
The wires 50 in the seat 10 are routed while switching the operation direction by three pulleys attached to the seat cushion frame 21 and the seat back frame 31. The downward bending deformation operation of the cushion spring 24 is first switched to an operation of pulling forward by the first pulley 51 in the seat cushion 20, and then the second portion at the connecting portion between the seat cushion 20 and the seat back 30. The operation is switched to the operation of pulling downward in the seat back 30 by the pulley 52, and finally the operation direction is reversed up and down by the third pulley 53 in the seat back 30 and transmitted as an operation of pulling the headrest 40 upward. As shown in FIGS. 1 to 3, the third pulley 53 is attached to the upper frame 32, but the first and second pulleys are omitted from the skeletal member to be attached. In particular, the first pulley is disposed at a position that does not interfere with the deformation of the pad material 28 due to the seating of the occupant.
As described above, when the cushion spring 24 bends downward, the headrest 40 moves in the direction of the upper use positions P1 and P2 by the amount of the bending deformation.

  On the other hand, a biasing member 42 that biases the headrest 40 toward the storage position P0 is attached to the mounting frame 33. In this embodiment, as shown in FIGS. 2 and 3, the biasing member 42 is a tension coil spring. Therefore, as described above, when the headrest 40 is moved in the direction of the use positions P1 and P2, it is against the urging force of the urging member 42. Conversely, when the bending deformation of the cushion spring 24 is removed, the headrest 40 is moved to the storage position P0 by the urging member 42 and the wire 50 is pulled back to the other end side (headrest 40 side).

The sheet | seat 10 comprised as mentioned above has the following effects.
According to this configuration, when the seated person S is seated on the seat cushion 20 and a downward bending deformation occurs in the cushion spring 24 due to the load, one end of the wire 50 attached to the cushion spring 24 is deformed by this deformation operation. By being pulled, the operation is transmitted to the headrest 40 through the wire 50, and the headrest 40 to which the other end of the wire 50 is attached is pulled and moved in the use positions P1 and P2. Accordingly, the headrest 40 can be taken out from the storage position P0 in the seat back 30 to the use positions P1 and P2 above the seat back 30 only by the seated person S sitting on the seat cushion 20.
Further, according to this configuration, when the seated person S sits on the seat cushion 20, the amount of bending deformation of the cushion spring 24 changes according to the load, and the amount of the wire 50 drawn also changes. Further, since the possible movement of the headrest 40 is in the vertical direction, the amount of movement of the headrest 40 upward from the storage position P0 also changes. That is, when the seated person S is large, the use position of the headrest 40 reaches, for example, a high position indicated by P2 in FIG. 1, and when it is small, it remains at a low position indicated by P1 in FIG. Therefore, the use positions P1 and P2 of the headrest 40 can be automatically adjusted to a height that matches the size of the seated person S, and there is no need to manually adjust the height as in the prior art. In addition, this makes it possible to reliably support the head of the seated person S by the headrest 40 regardless of the size of the seated person S, which is also effective for countermeasures against whiplash when the vehicle undergoes a rear collision.
Further, according to this configuration, the urging member 42 that urges the headrest 40 toward the storage position P0 is attached. For this reason, when the seated person S leaves the seat cushion 20 and the load on the seat cushion 20 is removed, the bending deformation of the cushion spring 24 is removed, and the headrest 40 is pulled back to the storage position P0 by the biasing member 42. Therefore, the headrest 40 can be stored in the seat back 30 only by the seated person S moving away from the seat cushion 20.

In addition, the vehicle seat which concerns on this invention is not limited to said embodiment, It can implement with other various forms.
The transmission of the operation in this embodiment is performed by a mechanism using the wire 50 and the pulleys 51, 52, 53. However, as long as the mechanism is a mechanical transmission mechanism, for example, transmission by a link or gear, air, oil, or the like Transmission using fluid is also possible.
In the present embodiment, it is configured to detect the bending deformation of the cushion spring 24 when the seated person S is seated on the seat cushion 20, but other configurations that cause the bending deformation in the seat cushion 20 such as the pad material 28. It is good also as a structure which detects the deformation | transformation of a site | part (member).
In the present embodiment, the headrest 40 is moved in the use position direction by an amount corresponding to the amount of deflection of the cushion spring 24 via the wire 50, but one end side of the wire 50 (cushion spring 24 side). Further, a known double speed moving mechanism may be provided on at least one of the other end side (headrest 40 side) so that the moving amount of the headrest 40 is larger than the bending amount of the cushion spring 24. For example, if a double speed moving mechanism is provided at each of the one end side and the other end side of the wire 50, the moving amount of the headrest 40 can be made four times the bending amount of the cushion spring 24. According to the configuration in which such a double speed moving mechanism is provided, even when the elasticity of the cushion spring 24 is set to be relatively hard and the amount of bending thereof is small, the necessary amount of movement of the headrest 40 is ensured. be able to.
In the present embodiment, the wire 50 for transmitting the operation passes through the connecting portion between the seat cushion 20 and the seat back 30. The connecting portion is provided with a reclining mechanism so that the seat back 30 is angled with respect to the seat cushion 20. In the case where the adjustment is made possible, the angle adjustment does not affect the operation transmission by the wire 50 if the second pulley is provided coaxially with the rotation shaft for adjusting the angle.
Although the headrest 40 in the present embodiment moves in the vertical direction, the headrest 40 is pivotally attached to the upper end portion of the seat back 30 and passes the rear side from the storage position in the seat back 30 to the upper use position. It is good also as what moves so that it may jump up to. When such a flip-up type headrest is used, the use position cannot be changed depending on the size of the seated person S as in the present embodiment. For this reason, for example, a member that urges the headrest in the use position direction and a stopper that holds the headrest in the retracted position are provided, and when the bending deformation of the cushion spring due to the seating is detected, the operation is stopped regardless of the amount of bending. It is necessary to adopt a configuration in which the headrest is jumped to the use position by being transmitted as an action to remove the headrest.

10 Seat 20 Seat cushion 21 Seat cushion frame 22 Front frame member 23 Rear frame member 24 Cushion spring 28 Pad material 29 Cover material 30 Seat back 31 Seat back frame 32 Upper frame 33 Headrest mounting frame 34 Bracket 35 Headrest storage recess 38 Pad Material 39 Surface material 40 Headrest 41 Stay 42 Energizing member 43 Wire attachment part 50 Wire 51 First pulley 52 Second pulley 53 Third pulley S Seated person P0 Storage position P1 Use position (when seated person is small)
P2 use position (when seated person is large)

Claims (4)

A seat cushion on which the occupant sits, a seat back on which the occupant is seated, and a headrest that supports the occupant's head,
In the vehicle seat in which the headrest is provided so as to be movable between a storage position in the seat back and a use position above the seat back,
The seat cushion is provided with a detection mechanism for detecting a bending deformation of a portion bent by a seating load of the seated person,
The bending deformation operation detected by the detection mechanism provided in the seat cushion is connected to the headrest via a mechanical transmission mechanism such as a wire as an operation for moving the headrest.
The transmission connection by the mechanical transmission mechanism is a transmission connection in which the headrest is moved from the retracted position in the seat back to the use position direction above the seat back by a load on which the seated person sits on the seat cushion. Vehicle seat. The vehicle seat according to claim 1,
A possible movement of the headrest is a vertical movement between the use position and the storage position. The vehicle seat according to claim 1 or 2,
The vehicle seat according to claim 1, wherein the headrest is biased in the storage position direction by a biasing member. The vehicle seat according to any one of claims 1 to 3,
The transmission connection by the mechanical transmission mechanism has a transmission connection configuration in which the amount of movement of the headrest in the use position direction changes according to the load of a seated person sitting on the seat cushion.

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