JP2008037267A - Headrest holding device and vehicle seat with the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest holding device capable of securely holding a headrest in the position after movement and returning the headrest to the original position in a vehicle seat capable of moving the headrest forwardly with respect to a certain amount of more load at the time of rear end collision to alleviate impact on a neck part of a seated occupant, and the vehicle seat with the holding device. <P>SOLUTION: The holding device 40 for holding an upper frame 10 moved to the forward upper direction at the time of rear end collision is provided in a backrest frame 3. The holding device 40 is provided with a base bracket 41 arranged in an upper frame 3b; a lock bracket 44 mounted to the base bracket 41 rotatably around a rotating shaft 43 and having a wire engagement part 44a in the upper frame 3b side; a spring member 42 for energizing the lock bracket 44 to the upper frame 3b side; and a wire 45 fixed to the upper frame 10 and engaged with the upper frame 10 and the lock bracket 44. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a headrest holding device and a vehicle seat provided with the holding device, and in particular, a headrest holding device that holds a headrest that moves forward toward a head of a seated person at a moving position in a collision from the rear. The present invention relates to a vehicle seat provided with the holding device.

Conventionally, a vehicular seat in which a headrest moves at the time of a rear collision and holds the headrest at a moving position is known (for example, see Patent Documents 1 and 2).
The vehicle seat described in Patent Document 1 is configured such that the pressure receiving portion moves backward due to the load of the seated person at the time of a rear collision, and the head frame moves forward and upward via a tension cable. More specifically, the lower end portion of the head frame is configured to be movable up and down via the guide portion by the tensile force of the tension cable, and the fitting width of the guide hole gradually decreases in a wedge shape on the movement end side. Thus, the head frame is held.

Further, the vehicle seat described in Patent Document 2 has a configuration in which, as in the present invention, the pressure receiving portion moves rearward due to the load of the seated person at the time of a rear collision, and the upper frame moves forward and upward via the link mechanism. ing.
In this vehicle seat, when the upper frame moves in the front upper direction, the upper frame is held by bringing the engagement piece into the upper frame position before the movement and abutting and engaging with the upper frame.

JP 2006-007831 A (paragraphs 0030-34) JP 2006-182096 A (paragraph 0020, FIGS. 7 and 8)

  However, the vehicle seat described in Patent Document 1 has a problem that the lower end portion of the head frame moves up and down via the guide portion even when a load is applied during normal use (other than the rear collision). That is, even when a load is applied during normal use, the head frame moves up and down, resulting in inconvenience that the merchantability is lowered and the seated person is uncomfortable.

In addition, in the vehicle seat described in Patent Document 2, even when a load is applied during normal use (except during a rear collision), the upper frame moves forward and upward, and the engagement piece is positioned at the upper frame position before the movement. As a result, the headrest does not return to the original position but is held at that position.
As a technique for preventing the engagement piece from entering the upper frame position before the movement with respect to a load below a certain level, the holding device is provided with a spring for urging the engagement piece toward the front seat side. Can be considered. However, such a configuration causes inconveniences that the headrest is easily returned and the operability is deteriorated.

  An object of the present invention is a vehicle seat that can move a headrest forward with respect to a load exceeding a certain level at the time of a rear collision, and can mitigate an impact on a neck of a seated person, and the headrest is seated at the time of a rear collision. Provided are a holding device capable of smoothly moving toward a person's head, securely holding the headrest in the position after the movement, and returning the headrest to the original position again, and a vehicle seat provided with the holding device. There is.

  According to the headrest holding device of the first aspect, the subject is a headrest holding device that holds the headrest moved forward at the time of a rear collision, and includes a base bracket disposed on a back frame, and the base bracket. A lock bracket that is pivotally mounted about a rotation shaft, a spring member that urges the lock bracket toward the dorsal frame side, and is fixed to the upper frame and engages with the upper frame and the lock bracket. The lock bracket has a wire engaging portion protruding toward the dorsal frame side.

  Thus, in the headrest holding device of the present invention, the lock bracket is pressed against the wire by the torque of the spring member, and the wire is locked to the lock bracket. Can be prevented from moving forward.

  At this time, it is preferable that the lock bracket is formed with an inclined surface inclined toward the upper end on the upper frame side at a position above the wire engaging portion of the lock bracket. If comprised in this way, the lower part of the wire which removed from the wire engaging part by the collision from back will contact | abut to the inclined surface of a lock bracket, and a wire can be hold | maintained by friction.

  Preferably, the wire is formed in an upward U-shape, the free end side is fixed to the upper frame, and the central portion of the U-shape is engaged with the wire engaging portion. It is. If comprised in this way, a wire lower part can be reliably engaged with a wire engaging part.

  Further, the spring member is wound around the rotating shaft, one end is engaged with a spring engagement hole provided in the lock bracket, and the other end is engaged with a spring engagement portion provided in the base bracket. Such a configuration is preferable. If comprised in this way, a lock bracket can always be urged | biased by the back frame side with a spring member.

  Further, according to the vehicle seat provided with the headrest holding device according to claim 5, the problem is that the headrest holding device having the above-described configuration, a headrest disposed behind the head of the seated person, and a rear collision. A pressure receiving part that receives a load from the waist of the seated person, a link mechanism that moves the headrest back and forth by a load applied to the pressure receiving part, an upper frame that is connected to the upper part of the link mechanism and to which a headrest holding guide is attached; It is solved by providing.

  As described above, in the vehicle seat equipped with the headrest holding device of the present invention, the pressure receiving portion is moved rearward by the load received at the time of the rear collision, and the headrest can be moved forward via the link mechanism.

  Further, it is preferable that the wire is detached from the wire engaging portion by a load input at the time of rear collision, and the upper frame is moved in the front upper direction. If comprised in this way, a headrest can be smoothly moved forward in the state without reaction force with respect to the load more than fixed.

  According to the headrest holding device of the present invention and the vehicle seat equipped with the holding device, the headrest can be moved forward with respect to a load exceeding a certain level at the time of rear-end collision, and the impact on the neck of the seated person can be reduced. It is a possible vehicle seat, and the headrest moves smoothly toward the seated person's head at the time of a rear collision, and the headrest can be securely held at the position after this movement and returned to the original position again. Become. At this time, the presence of the wire engaging portion protruding toward the back frame side prevents the headrest from moving forward with respect to a load below a certain level. In addition, the lock bracket engages with the wire and the spring member that biases toward the dorsal frame side is disposed only on the lock bracket side. Therefore, the spring member is provided on each of the lock bracket side and the wire side. It is possible to prevent the headrest from being easily returned and to ensure operability as compared with the case where it is provided.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below are not intended to limit the present invention and can be variously modified within the scope of the gist of the present invention.
1 to 8 relate to an embodiment of the present invention, FIG. 1 is an explanatory view of a vehicle seat, FIG. 2 is a perspective view of a backrest seat frame and a link mechanism, and FIG. 3 is a partial description of FIG. 4 is an explanatory diagram of the link mechanism showing a state in which the link mechanism is operated by a rear collision, FIG. 5 is an enlarged explanatory diagram of the holding device, FIG. 6 is an enlarged cross-sectional view of a main part of the holding device before the rear collision, FIG. 8 is an enlarged cross-sectional view of the main part of the holding device in a state where the upper frame has moved due to a cause other than the rear collision, and FIG. 8 is an enlarged cross-sectional view of the main part of the holding device after the rear collision.

  A vehicle seat 1 according to the present invention includes a backrest seat 2 having a backrest frame 3 (3a, 3b) and a cushion material 4, and a headrest H attached to an upper portion of the backrest seat 2. . The headrest H of this example is configured to move forward and support the head of the seated person when receiving a collision from behind.

  The backrest sheet 2 is configured by attaching a cushion material 4 to the back frame 3 and covering the outer periphery of the cushion material 4 with a skin member 5. The dorsal frame 3 includes a side frame 3a and an upper frame 3b as shown in FIG.

  The configuration of the headrest H is arbitrary, and includes at least a head support portion 7 that supports the head of the seated person and a pillar 8 for mounting the head support portion 7 to the backrest seat 2. ing. In this example, as shown in FIG. 1, an example using two pillars 8 is shown.

  Moreover, as shown in FIG. 2, the upper frame 10 is arrange | positioned at the front seat side of the upper frame 3b. The upper frame 10 is provided with two pillar support members 11 as holding guides for the headrest H, and the upper frame 10 is fixed to the link bracket 12.

  The link bracket 12 is pivotally attached to the pivot shaft 13, and the pivot shaft 13 is fixed to the upper frame 3b. The pillar 8 of the headrest H is attached to a pillar support member 11 provided on the upper frame 10 so that the height can be adjusted.

  The headrest H of the present example is configured to move forward and support the seated person's head when receiving a collision from behind, but the forward movement operation of the headrest H is a link mechanism. Is made by The link mechanism includes a link bracket 12 attached to the upper frame 10, a transmission member 26 connected to the link bracket 12, a lower link 35 connected to the transmission member 26, and a wire spring on the lower link 35. And a pressure receiving portion 31 connected by a line 34.

  More specifically, the link bracket 12 and the transmission member 26 are swingably connected by the shaft 15. The transmission member 26 is a long member and is disposed along the side frame 3 a of the dorsal frame 3.

  The other end of the transmission member 26 opposite to the shaft 15 is connected to the lower link 35 by the shaft 17 so as to be rotatable. The lower link 35 is swingably connected to the side frame 3a by the shaft 19.

  Moreover, the pressure receiving part 31 of this example is also provided with the function to support a seated person's back part. The pressure receiving unit 31 supports the back of the seated person with a surface and stabilizes the sitting posture. Moreover, when the vehicle receives a collision from the rear, the vehicle receives the load of the seated person and moves to activate the link mechanism. The headrest H is moved forward by the operation of the link mechanism to support the seated person's head and to reduce the impact on the neck.

  The pressure receiving portion 31 of this example is formed in a substantially rectangular single plate shape, and the material of the pressure receiving portion 31 is made of a synthetic resin such as polypropylene and has a predetermined strength capable of supporting a seated person. Yes. When receiving a rear load (including a case of weight) from a seated person, the pressure receiving portion 31 supports the load while being elastically deformed to some extent. As a result, it is possible to flexibly feel the so-called “hit” when hitting the back.

  The pressure receiving portion 31 is configured to be attached to the side frame 3a of the dorsal frame 3 so as to be movable back and forth via a wire spring 34 such as a zigzag spring or a formed wire spring. The pressure receiving part 31 supports the seated person back and forth while maintaining the surface state. The wire spring 34 has a predetermined elasticity, and is configured such that when a load is applied to the pressure receiving portion 31, the entire pressure receiving portion 31 can move backward while maintaining the surface state.

  As shown in FIG. 2, the wire springs 34 are arranged vertically. Among these, the wire spring 34 disposed above is attached between the pressure receiving portion 31 and the side frame 3a. The wire spring 34 disposed below is attached between the pressure receiving portion 31 and the lower link 35.

  As shown in FIG. 2, the wire spring 34 connected to the lower link 35 has a function as a rear collision detection spring 34X. The function of the rear collision detection spring 34 </ b> X is to transmit the rearward movement of the pressure receiving portion 31 due to the rearward movement of the seated person to the lower link 35, and this energy is transmitted to the link bracket 12 via the transmission member 26. Is transmitted to.

  Furthermore, the link bracket 12 moves the upper frame 10 forward and upward by the transmission energy of the transmission member 26. Then, the headrest H is moved forward to act to support the head of the seated person. The pressure receiving portion 31 between the portions to which the left and right rear impact detection springs 34X are attached corresponds to the rear impact detection portion that moves backward due to the load of the seated person collided from behind.

  As shown in FIG. 4, when the vehicle receives a collision from the rear and a load exceeding the preset value is applied to the pressure receiving portion 31, the pressure receiving portion 31 and the rear collision detection spring 34X move, and the lower link 35 is rotated in the direction of arrow A in FIG. And if the lower link 35 rotates, the transmission member 26 will move to the arrow B direction of FIG. 4, and the link bracket 12 will also move to the arrow B direction in connection with it.

  Further, when the link bracket 12 moves, the pivot shaft 13 rotates in the direction of arrow C in FIG. 4, and the upper frame 10 moves in the direction of arrow D in FIG. As a result, the headrest H moves forward.

  As shown in FIG. 2, a holding device 40 that holds the upper frame 10 moved in the front-up direction is attached to the upper frame 3b. As shown in FIGS. 5 and 6, the holding device 40 is attached to the base bracket 41 disposed on the upper frame 3 b and to the base bracket 41 so as to be rotatable around a rotation shaft 43, and to the upper frame 3 b side. A lock bracket 44 having a wire engaging portion 44a, a spring member 42 for urging the lock bracket 44 toward the upper frame 3b, and a wire 45 fixed to the upper frame 10 and engaged with the upper frame 10 and the lock bracket 44 It is composed of

A pair of attachment holes are formed in the base bracket 41, and are fixed to the upper frame 3b by a fastening tool 46 such as a bolt in a pair of insertion holes (not shown) formed in the upper frame 3b.
The lock bracket 44 is formed with an insertion hole 44b for inserting the rotary shaft 43 below, and a wire engaging portion 44a protruding in a substantially V-shaped cross section is formed on the upper frame 3b side. And the wire engaging part 44a of this example is formed in the curve shape at an angle of about 12 degrees in a wire engaging location, as shown by the arrow Y of FIG. The angle of the wire engaging portion 44a is not limited to this, and may be set according to the torque by the spring member 42. Further, the lock bracket 44 is formed with an inclined surface 44d inclined toward the upper end at a position above the wire engaging portion 44a and on the upper frame 10 side.

  The lock bracket 44 is attached so as to be rotatable about the rotation shaft 43 of the base bracket 41. A spring member 42 that urges the lock bracket 44 toward the upper frame 3b is wound around the rotation shaft 43. One end of the spring member 42 is engaged with a spring engagement hole 44c provided in the lock bracket 44, and the other end is engaged with a spring engagement portion (not shown) provided in the base bracket. In addition, the attachment structure of the spring member 42 is not limited to this, What is necessary is just to be comprised so that the lock bracket 44 may be urged | biased to the upper frame 3b side.

  Moreover, the free end side of the wire 45 formed in an upward U-shape is fixed to the approximate center of the upper frame 10 by welding or the like. In this example, the upper portion of the wire 45 is formed in a curved shape in accordance with the shape of the upper frame 10. Then, the U-shaped central portion of the wire 45 is engaged with the wire engaging portion 44 a of the lock bracket 44. With this configuration, the lock bracket 44 is always pressed against the wire 45 by the torque F of the spring member 42, and the wire 45 is locked to the lock bracket 44.

  Next, the state of the holding device 40 when receiving a rear load in the pressure receiving portion 31 will be described. FIG. 7 is an explanatory diagram when a rear load is received due to a cause other than a rear collision. When a load below a certain level is applied, the wire 45 is caught by the wire engaging portion 44a of the lock bracket 44, and the locked state is released. Not. Thus, even if the upper frame 10 is moved due to a cause other than the rear collision, the locked state is not released by the angle F of the wire engaging portion 44a and the torque F by the spring member 42. The headrest H can be returned to the use state. That is, it is possible to prevent the headrest from moving forward when receiving a rear load of a certain level or less.

  FIG. 8 is an explanatory diagram of the holding device 40 after the rear collision. When the vehicle receives a collision from the rear and a load of a certain level or more is applied to the pressure receiving portion 31, the wire 45 is engaged with the lock bracket 44. It will be in the state where it came off from the part 44a and the lock | rock was cancelled | released. When the lock of the wire 45 is released, the upper frame 10 moves forward and upward, and the headrest H moves forward.

  Further, the upper frame 10 is held by friction by making the lower portion of the wire 45 detached from the wire engaging portion 44 a abut against the inclined surface 44 d of the lock bracket 44. Thus, since it becomes possible to operate without a reaction force after unlocking, the upper frame 10 is easy to operate and the headrest H is difficult to return. In order to return the upper frame 10 to the normal position, it is possible to return the headrest H to the initial position.

  As described above, in the vehicle seat 1 of the present example, the headrest H is moved forward toward the head of the seated person with respect to a load of a certain level or more during the rear collision by the holding device 40, and the load is kept below a certain level. Can prevent the headrest H from moving forward. In addition, after the wire 45 is unlocked, it can be operated without any reaction force, and the headrest H can be moved smoothly, and can be securely held at the position after the movement, and the impact on the neck of the seated person can be reduced. It is possible.

It is explanatory drawing of the vehicle seat which concerns on one Embodiment of this invention. It is a perspective view of a backrest seat frame and a link mechanism. FIG. 3 is a partial explanatory diagram of FIG. 2. It is explanatory drawing of the link mechanism which shows the state which the link mechanism act | operated by the rear collision. It is an expansion explanatory view of a holding device. It is a principal part expanded sectional view of the holding | maintenance apparatus before a rear collision. It is a principal part expanded sectional view of the holding | maintenance apparatus in the state which the upper frame moved by causes other than rear collision. It is a principal part expanded sectional view of the holding | maintenance apparatus after a rear collision.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Back seat 3 Back frame 3a Side frame 3b Upper frame 4 Cushion material 5 Skin member 7 Head support part 8 Pillar 10 Upper frame 11 Pillar support member 12 Link bracket 13 Pivot shafts 15, 17, 19 Axis 26 Transmission member 31 Pressure receiving portion 34 Wire spring 34X Rear collision detection spring 35 Lower link 40 Holding device 41 Base bracket 42 Spring member 43 Rotating shaft 44 Lock bracket 44a Wire engagement portion 44b Insertion hole 44c Spring engagement hole 44d Inclined surface 45 Wire 46 Fastener H Headrest

Claims (6)

A headrest holding device for holding a headrest moved forward at the time of a rear collision,
A base bracket disposed on the dorsal fin frame;
A lock bracket attached to the base bracket so as to be rotatable about a rotation axis;
A spring member for urging the lock bracket toward the dorsal frame;
A wire fixed to the upper frame and engaged with the upper frame and the lock bracket;
The headrest holding device, wherein the lock bracket has a wire engaging portion protruding toward the dorsal frame side.   The headrest holding device according to claim 1, wherein an inclined surface inclined toward an upper end is formed on the upper frame side at a position above the wire engaging portion of the lock bracket.   The wire is formed in an upward U-shape, a free end side is fixed to the upper frame, and a central portion of the U-shape is engaged with the wire engaging portion. The headrest holding device according to claim 1.   The spring member is wound around the rotating shaft, one end is engaged with a spring engagement hole provided in the lock bracket, and the other end is engaged with a spring engagement portion provided in the base bracket. The headrest holding device according to claim 1.   The headrest holding device according to any one of claims 1 to 4, a headrest disposed behind the head of the seated person, a pressure receiving part that receives a load from the waist of the seated person during a rear collision, and the pressure receiving part A headrest holding device comprising: a link mechanism that moves the headrest back and forth by a load applied to the portion; and an upper frame that is connected to the upper portion of the link mechanism and to which a holding guide for the headrest is attached. Vehicle seat. The vehicle seat provided with the headrest holding device according to claim 5, wherein the wire is disengaged from the wire engaging portion by a load input at the time of rear collision, and the upper frame is moved in the front upper direction.

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