JP5470737B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more specifically, includes a seat cushion, a seat back, and a headrest. When a rear collision occurs in the vehicle, at least a portion of the headrest that supports the occupant's rear head is an occupant. The present invention relates to a vehicle seat having a structure that protrudes toward the back of the head.

As this type of vehicle seat, for example, the technique disclosed in Patent Document 1 is already known. In this technique, the vehicle seat is composed of a seat cushion, a seat back, and a headrest. When a rear collision occurs in the vehicle, at least a portion of the headrest that supports the occupant's rear head (hereinafter referred to as “support plate”) protrudes toward the occupant's rear head. As a result, it is possible to instantaneously receive the occupant's occipital region that has received a rear impact.
German patent invention No. 102005051109

  However, the vehicle seat described above has a structure in which the inflator housed inside the headrest is operated to pop out the support plate. For this reason, there has been a problem that the headrest is enlarged as the inflator is housed.

  The present invention is intended to solve such a problem, and its purpose is to provide a headrest that supports an occupant's rear head by operating an inflator when a rear collision occurs in the vehicle. It is an object of the present invention to provide a vehicle seat in which the headrest can have a compact structure.

The present invention is for achieving the above object, and is configured as follows. The invention according to claim 1 includes a seat cushion, a seat back, and a headrest. When a rear collision occurs in the vehicle, the lock mechanism provided on the headrest is unlocked by operating the inflator. The vehicle seat has a structure in which at least a portion of the headrest that supports the occupant's rear head protrudes toward the rear head side of the occupant by the unlocking, and the headrest is seat-backed via the stay. The main body of the inflator is assembled to the seat back end of the both ends of the stay, and when the inflator is activated, the lock mechanism is unlocked via the transmission member. , the transmission member is a rod that is inserted inside of the stay, the unlocking of the locking mechanism Piston disposed in the interior of the inflator is carried out by pushing up directly rod by explosive force of explosive disposed in the interior of the inflator, the inflator, the body is assembled in a detachable structure relative to the stay The inflator is characterized in that its main body is formed in a substantially L-shaped bent shape .
According to this configuration, when a rear collision occurs in the vehicle, the inflator can be operated to instantly receive the occupant's rear head. At this time, since the inflator is provided not on the headrest side but on the seatback side, the headrest can be made more compact than in the case where the inflator is provided on the seatback side as in the prior art.

The invention according to claim 2 is the vehicle seat according to claim 1, wherein the folding is formed so as to face in a direction between the outer direction and the front direction of the seat back. Features.
According to this configuration, for example, even when the headrest is lowered from the normal height position by the vertical movement mechanism, the inflator does not interfere with the pad member inside the seat back.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a schematic perspective view of a vehicle seat according to an embodiment of the present invention, showing a state in which a headrest is in a normal height position with respect to a seat back. FIG. 2 is an exploded perspective view showing assembly of the inflator, which is a main part of the present invention. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along line BB in FIG. FIG. 5 shows a state in which the headrest jumps out in FIG. FIG. 6 shows a state in which the jumping out of the headrest is completed in FIG. FIG. 7 shows a state in which the headrest is lowered from the normal height position in FIG.

  In each of the above-described drawings, in order to show the internal structure of the seat back 2 and the headrest 3 in an easy-to-understand manner, these cushion structure and skin structure are omitted and only the internal frame structure is shown. In the following description, the terms “up”, “down”, “front”, “rear”, “left”, and “right” refer to the directions of “up”, “down”, “front”, “rear”, “left”, “right” described in the above-described drawings. The direction of up, down, front, back, left and right is shown.

  First, with reference to FIGS. 1-3, the vehicle seat which concerns on the Example of this invention is demonstrated. As shown in FIG. 1, the vehicle seat is, for example, a passenger seat provided in an automobile, and includes a seat cushion (not shown), a seat back 2, and a headrest 3. Below, the detailed structure of the seat back 2 and the headrest 3 among these structural members is demonstrated separately.

  First, the seat back 2 will be described. The seat back 2 is wrapped around a pair of left and right side frames 10, 10 that form an outline thereof, an upper frame 12 that is assembled so as to bridge the upper ends of the side frames 10, and both the side frames 10. It is comprised from the pad member (not shown) assembled | attached by the wearing form, and the cover member (not shown) which covers this pad member.

  Of the constituent members of the seat back 2, the upper frame 12 will be described in detail. A pair of left and right holders 14 and 14 are fixed to the upper frame 12, respectively. In addition, a pair of left and right supports 16 and 16 capable of inserting and locking a pair of left and right stays 22 and 22 of the headrest 3 to be described later are assembled to both the holders 14, respectively. Further, the upper frame 12 is assembled with a vertical movement mechanism M that moves the headrest 3 up and down together with a pair of left and right stays 22 and 22.

  Next, the headrest 3 will be described. The headrest 3 supports a base 20 that forms an outline thereof, a pair of left and right stays 22 and 22 that are assembled together with the base 20, and a rear head of an occupant who covers the front of the base 20 and sits on a seat cushion. A plate-like support plate 24, a pad member (not shown) that is assembled to the base 20 and the support plate 24, and a cover member (not shown) that covers the pad member. ing.

  Of the constituent members of the headrest 3, the pair of left and right stays 22 and 22 will be described in detail. The pair of left and right stays 22 and 22 are each configured in a cylindrical shape. The headrest 3 can be assembled to the seat back 2 by inserting these stays 22 into the both supports 16 of the seat back 2 already described. Also, a rod 36 is inserted into the left stay 22 among these stays 22. At this time, the rod 36 is inserted into the left stay 22 with its upper end hooked on a support member 34 of the lock mechanism R described later and with its lower end in contact with a piston 56 of an inflator 50 described later. (See FIG. 3). The rod 36 corresponds to a “transmission member” described in the claims.

  Further, among the constituent members of the headrest 3, the support plate 24 will be described in detail. The support plate 24 is assembled to the base portion 20 via the link mechanism L. The link mechanism L includes a pair of left and right link bars 28 pivoted to the base 20 and the support plate 24 at both ends, and a pair of left and right support portions 26 and 26 formed on the back surface (rear surface) of the support plate 24. It consists of and. A connecting stay 26a is fixed to both the support portions 26 so as to bridge the ends of the supporting portions 26, and the connecting stay 26a can move in a long hole 20a formed in the base portion 20. At this time, the connecting stay 26a is fixed to the both support portions 26 in a state of being biased by the tension spring 30 toward the upper end side of the long hole 20a.

  When the connecting stay 26 a is at the lower end of the long hole 20 a against the urging force of the tension spring 30, the connecting stay 26 a is locked by the lock mechanism R so that the support plate 24 is integrated with the base portion 20. (Hereinafter, this state is referred to as “normal state of the headrest 3”). When the lock is released, the connecting stay 26a is moved from the lower end of the elongated hole 20a toward the upper end by the urging force of the tension spring 30. By operating the link mechanism L in this manner, the support plate 24 protrudes toward the back of the occupant from the base 20.

  The lock mechanism R will be described in detail. The lock mechanism R includes a hook 32 that is pivotally attached to the base portion 20 and a support member 34 that is engageable with the hook 32 and pivotally attached to the base portion 20. When the connecting stay 26 a is at the lower end of the long hole 20 a, the connecting stay 26 a is sandwiched between the hooks 32, and the hook 32 sandwiched is engaged with the support member 34, so that the connecting stay 26 a is attached to the tension spring 30. It is held at the lower end of the long hole 20a against the force (see FIG. 4).

  As described above, the upper end of the rod 36 disposed inside the left stay 22 is hooked on the support member 34. When the rod 36 is pushed up by the operation of an inflator 50 described later, the support member 34 rotates to release the engagement state between the hook 32 and the support member 34 and release the holding of the connecting stay 26a. It has become. In this way, the lock mechanism R is configured.

  An inflator 50 is assembled to the left stay 22 of the pair of left and right stays 22 via a cylindrical bracket 42 (see FIG. 2). When this assembly structure is described in detail, the left stay 22 is assembled in such a manner that the lower end thereof is inserted into the upper end of the bracket 42. In this inserted state, a pin (not shown) is further inserted to prevent the lower end of the left stay 22 from coming out of the upper end of the bracket 42.

  Further, the inflator 50 is assembled so that its upper end is inserted into the lower end of the bracket 42. At this time, the upper end of the inflator 50 and the lower end of the bracket 42 are assembled in a screwed state. Thereby, the upper end of the inflator 50 is prevented from coming off from the lower end of the bracket 42. In this way, the bracket 42 that assembles the left stay 22 and the inflator 50 is assembled to the vertical movement mechanism M via the bolt. Therefore, when the vertical movement mechanism M is operated, the headrest 3 can be lifted and lowered with respect to the seat back 2 together with the inflator 50. Therefore, the headrest 3 can be adjusted to the height position desired by the occupant.

  The inflator 50 will be described in detail. The inflator 50 is disposed on the other end side of a cylindrical main body 52 bent in a substantially L shape, an explosive 54 disposed on one end side of the main body 52, and the other end side. And a piston 56. At this time, the bending of the main body 52 is formed so as to be directed in a direction between the outer direction of the seat back 2 (in this case, the left direction) and the front direction. The inflator 50 is electrically connected to an ECU (not shown) and has a structure capable of detecting a rear collision occurrence signal sent from the ECU when the ECU detects that a rear collision has occurred in the vehicle. Yes. The inflator 50 is configured to explode the explosive 54 upon detecting a rear collision occurrence signal, and actuates the piston 56 by the explosive force to push up the rod 36.

  Next, the operation of the vehicle seat having the above-described configuration will be described. As shown in FIG. 3, when a rear collision occurs in the vehicle in the normal state of the headrest 3, the rod 36 is pushed up by the explosive force of the explosive 54 of the inflator 50 (see FIG. 5). Then, the lock mechanism R is unlocked, and the connecting stay 26a moves from the lower end of the long hole 20a of the base portion 20 toward the upper end. Then, when the link mechanism L is operated, the support plate 24 shifts to a state where the support plate 24 protrudes toward the back of the occupant from the base 20 (see FIG. 6). In this manner, when a rear collision occurs in the vehicle, the occupant's rear head can be instantaneously received by the support plate 24.

  The vehicle seat according to the embodiment of the present invention is configured as described above. According to this configuration, when a rear collision occurs in the vehicle, the inflator 50 can be operated to instantly receive the occupant's head. At this time, since the inflator 50 is provided not on the headrest 3 side but on the seatback 2 side, the headrest 3 is made compact in comparison with the case where the inflator 50 is provided on the seatback 2 side as in the prior art. Can do.

  Further, according to this configuration, the rod 36 is arranged in a manner to be inserted into the left stay 22. Therefore, the appearance of the vehicle seat is not deteriorated by the rod 36. Further, according to this configuration, the vertical movement mechanism M that moves the headrest 3 up and down together with the pair of left and right stays 22 and 22 is provided. Therefore, the headrest 3 can be adjusted to the height position desired by the occupant.

  Further, according to this configuration, the inflator 50 is detachably assembled to the left stay 22. Therefore, the inflator 50 can be easily replaced. Further, according to this configuration, the inflator 50 has a main body 52 formed in a substantially L-shaped bent shape. Therefore, for example, even when the headrest 3 is lowered from the normal height position by the vertical movement mechanism M, the inflator 50 may interfere with a backboard (not shown) arranged on the back surface of the seat back 2. No (see FIG. 7).

  Further, according to this configuration, the bend of the inflator 50 is formed so as to face the direction between the outer direction and the front direction of the seat back 2. Therefore, for example, even when the headrest 3 is lowered from the normal height position by the vertical movement mechanism M, the inflator 50 does not interfere with the pad member inside the seat back 2.

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In the embodiment, the case where the vehicle seat is the driver's seat 1 has been described as an example. However, the seat is not limited to this, and the seat for the vehicle may be any seat as long as the seat is disposed in the vehicle.

  Moreover, in the Example, the case where the support plate 24 had a structure which protruded toward the passenger | crew's back head side with respect to the base 20 among the structural members of the headrest 3 was demonstrated. However, the present invention is not limited to this. For example, the support plate 24 and the base 20 are integrally formed, and the base 20 is directed toward the occupant's back of the head with respect to the pair of left and right stays 22 and 22. It may be a structure that pops out.

FIG. 1 is a schematic perspective view of a vehicle seat according to an embodiment of the present invention, showing a state in which a headrest is in a normal height position with respect to a seat back. FIG. 2 is an exploded perspective view showing assembly of the inflator, which is a main part of the present invention. 3 is a cross-sectional view taken along line AA in FIG. 4 is a cross-sectional view taken along line BB in FIG. FIG. 5 shows a state in which the headrest jumps out in FIG. FIG. 6 shows a state in which the jumping out of the headrest is completed in FIG. FIG. 7 shows a state in which the headrest is lowered from the normal height position in FIG.

Explanation of symbols

2 Seat back 3 Headrest 22 Stay 36 Rod (Transmission member)
50 Inflator M Vertical movement mechanism R Lock mechanism

Claims (2)

A seat cushion, a seat back, and a headrest are configured. When a rear collision occurs in the vehicle, the inflator is activated to unlock the lock mechanism provided on the headrest. Among them, at least a part for supporting the occupant's rear head is a vehicle seat having a structure that protrudes toward the occupant's rear head,
The headrest is assembled to the seat back via the stay,
The inflator has its main body assembled to the end on the seat back side of both ends of the stay.
When the inflator is activated, the lock mechanism is unlocked via the transmission member ,
The transmission member is a rod inserted into the stay,
The unlocking of the locking mechanism is performed by directly pushing up the rod by the explosive force of the gunpowder arranged inside the inflator with the piston arranged inside the inflator ,
The inflator is assembled with a structure that allows the main body to be removed from the stay
The inflator is a vehicle seat characterized in that its main body is formed in a substantially L-shaped bent shape . The vehicle seat according to claim 1,
The vehicle seat , wherein the bent portion is formed so as to face a direction between an outer direction and a front direction of the seat back .

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