JP6575408B2 - Headrest support structure for vehicle seat - Google Patents

Description

  The present invention relates to a headrest support structure for a vehicle seat.

  Patent Document 1 discloses a technique for reducing a burden on a seated occupant's neck by allowing a pad portion of a headrest to move up and down with respect to a stay portion fixed to a seat back frame at the time of a rear collision of a vehicle. Yes. When the seated occupant's body is lifted or lowered with respect to the seat back during a rear-end collision, the headrest moves up and down following the movement of the seated occupant's head. It will reduce the burden. In such a headrest, the pad portion is in a locked state in which the pad portion is not normally moved relative to the stay portion, and the locked state is released at the time of a rear collision of the vehicle, so that the pad portion can move in the vertical direction with respect to the stay portion. The lock mechanism in this case is disposed between the stay portion and the pad portion in the headrest body.

JP2013-169945A

  In the technique described in Patent Document 1, the pad portion of the headrest is relatively large, and a lock mechanism can be disposed between the stay portion and the pad portion. However, in the headrest where the size of the pad portion of the headrest is small, it is difficult to dispose the lock mechanism between the stay portion and the pad portion, and the technology that allows the pad portion of the headrest to move up and down at the time of the rear impact of the vehicle as described above. Was hard to adopt. Further, in the technique described in Patent Document 1, when adjusting the height of the headrest in accordance with the size of the seated occupant during normal operation, the lock of the stay portion with respect to the seat back frame is released and the entire headrest is moved up and down. It was. On the other hand, as is often seen in European cars, the stay is fixed to the seat back frame, the pad is locked with respect to the stay and the headrest height is adjusted by adjusting the vertical position of only the pad. There is also a type of headrest to do. In the case of a headrest where the stay is fixed to the seat back frame, when applying the technology that allows the pad to move up and down with respect to the stay at the time of the rear impact of the vehicle, the normal locking mechanism and the rear impact It is necessary to separately provide another lock mechanism between the stay portion and the pad portion, which makes the structure complicated and difficult to employ.

  In view of these points, the problem of the present invention is that the headrest can be moved in the vertical direction at the time of a rear-end collision even if it is a type of headrest in which it is difficult to arrange a lock mechanism in the headrest body due to the small pad portion of the headrest. The present invention provides a headrest support structure for a vehicle seat.

  A first aspect of the present invention is a headrest support structure for a vehicle seat, the stay portion extending downward from the headrest body, the stay portion being movable in the vertical direction with respect to the seat back frame, and swinging in the front-rear direction A holder portion disposed on the seat back frame to be supported, and a horizontal bar portion disposed on the seat back frame below the holder portion and extending between the stay portions at a normal time. And a part of the seat back frame in a locked state incapable of moving in the vertical direction and in the forward and backward direction and unlocked when a rear impact load is applied to the headrest body. A lock portion that moves forward, and a lock portion that is disposed on the seat back frame in front of the lock portion and is unlocked. The lateral bar portion is characterized by having a a movement permitting part of the transverse bar portion for vertically movably guided when moved forward.

  According to the first aspect of the present invention, in the normal state, the stay portion is supported by the holder portion and the lock portion so as not to move up and down and swing back and forth with respect to the seat back frame. Then, when a rear impact load is applied to the headrest main body due to a rear collision or the like, the horizontal bar portion moves from the lock portion to the movement allowing portion, and the entire headrest can move in the vertical direction with respect to the seat back frame. Therefore, even if it is difficult to dispose a lock mechanism between the stay part and the pad part in the headrest body due to the small pad part of the headrest body, the headrest should be attached to the headrest body when a rearward impact load is applied. It can be movable in the vertical direction. As a result, the headrest moves up and down following the movement of the head of the seated occupant when a rearward impact is applied to the headrest body due to a rear impact or the like without providing a lock mechanism in the headrest body. Can reduce the burden on

  According to a second aspect of the present invention, in the first aspect, the lock portion and the movement allowing portion are formed in a resin molded body fixed to the seat back frame.

  According to the second aspect of the present invention, the structure is simplified because the lock portion and the movement allowing portion are formed in the resin molded body.

  According to a third aspect of the present invention, in the second aspect, the movement allowance portion is configured by a vertically long movement allowance hole formed adjacent to the front side of the lock portion, and the lock portion is the movement portion. It is constituted by a holding hole that has a locking claw portion at both upper and lower ends of the opening connected to the permission portion or a weakening portion adjacent to the movement permission portion and that holds the part of the horizontal bar portion fitted therein. It is characterized by.

  According to the third invention, the movement allowable hole in the resin molded body and the holding hole having the weakened portion adjacent to the locking claw portion or the movement allowable portion at both the upper and lower end portions of the opening connected to the movement allowable portion, Since it is sufficient to provide it, the structure becomes simple.

It is a perspective view of the headrest support structure concerning one embodiment of the present invention. A solid line represents a normal state, and a two-dot chain line represents an upward movement state of the headrest when an impact load is applied. It is a front view of the headrest support structure concerning the above-mentioned embodiment. A solid line represents a normal state, and a two-dot chain line represents an upward movement state of the headrest when an impact load is applied. It is sectional drawing of the normal state shown cut | disconnected by the III-III line of FIG. FIG. 4 is a cross-sectional view illustrating a state where an impact load is applied in FIG. 3 and a horizontal bar portion moves forward and enters a movement allowable hole. FIG. 4 is a cross-sectional view illustrating a state in which an impact load is applied in FIG. 3 and the horizontal bar portion moves forward and enters a movement allowable hole and then moves upward. It is a figure explaining the passenger | crew sitting posture of a normal state (state corresponding to FIG. 3) in the said embodiment. It is a figure explaining a passenger | crew sitting posture of the state (state corresponding to FIG. 4) when an impact load is applied and the passenger | crew's head is strongly pressed by the headrest in the said embodiment. It is a figure explaining a passenger | crew sitting posture of the state (state corresponding to FIG. 5) when a headrest moves upwards with the force from a passenger | crew's head in the said embodiment.

  1 to 8 show an embodiment of the present invention. In each figure, each direction of the vehicle when the automobile seat 1 is attached to the vehicle floor is indicated by an arrow. In the following description, the description regarding the direction is made based on this direction.

  1 and 2 are perspective views of the upper portion of the seat back 10 of the automobile seat 1 and the headrest 20. The vehicle seat 1 includes a seat cushion on which an occupant is seated, a seat back 10 that serves as a back of the occupant, and a headrest 20 that supports the head of the occupant. Since the seat cushion has a known configuration, the description thereof will be omitted, and the seat back 10 and the headrest 20 will be described. Here, the automobile seat 1 corresponds to the “vehicle seat” in the claims.

  As shown by a solid line in FIGS. 1 and 2, the seat back 10 includes a metal back frame 11 having a substantially rectangular frame shape when viewed from the front as a member forming the skeleton. Furthermore, the seat back 10 includes a back pad 10P that is a cushion material that covers the back frame 11 and a back cover 10C that is a skin material that covers the pad material as members that form an outer shape including a backrest surface. The thin solid line indicates the outline of the back cover 10C. A headrest 20 is attached to the upper portion of the seat back 10 to support the back of the seated person. Here, the back frame 11 corresponds to a “seat back frame” in the claims.

  The back frame 11 mainly includes an upper frame 12, a side frame 13, and a lower panel (not shown). These constituent members are integrally connected to each other by welding to form a substantially rectangular frame shape when viewed from the front. The side frame 13 is a press-molding member that extends in the vertical direction on the left and right sides of the seat, and is provided with standing walls at the front and rear ends that extend inward of the seat. The upper frame 12 is a member obtained by bending a pipe having a circular cross section into a substantially inverted U shape when viewed from the front, and has a side portion 12b and an upper side portion 12a. Both side portions 12 b of the upper frame 12 are connected to the upper ends of the side frames 13. The lower panel is a strip-shaped member extending in the left-right direction, and is attached to the inside of the lower part of both side frames 13 in a bridging manner.

  A reinforcing member 15 is attached between the side portions 12b of the upper frame 12. The reinforcing member 15 is a strip-shaped member extending in the left-right direction, and is disposed in a direction in which the width direction is substantially vertical, and is parallel to the upper side portion 12 a of the upper frame 12. . Both ends of the reinforcing member 15 in the longitudinal direction are connected to the rear sides of both side portions 12b of the upper frame 12 by welding. Further, the reinforcing member 15 is configured such that the upper and lower edges, which are both sides in the width direction, are bent toward the front side in the longitudinal direction to form a standing wall.

  A flat portion 12a1 is provided at the front portion of the upper frame 12 around a position away from the center in the left-right direction by a half of the distance between the rod portions 21a of the stay 21 of the headrest 20. Each of the flat portions 12a1 is connected to a holder 16, which is a rectangular tube-shaped metal member, by welding. A resin headrest support 17 is inserted and held in the inner cylinder portion of the holder 16 from above. The headrest support 17 is made of a resin and has a cylindrical shape like a normal one, and has a hole 17a penetrating vertically through the center where the rod portion 21a of the stay 21 of the headrest 20 is inserted and held. However, the headrest support 17 is different from a normal one in the following two points. The first point is that the headrest support 17 only supports the rod portion 21a of the stay 21 of the headrest 20 so as to be movable up and down, and does not include a lock mechanism that locks the headrest so that it cannot move up and down or unlocks it so that it can move up and down. Is a point. The second point is that the headrest support 17 is provided with a notch portion 17b extending in the vertical direction through which a horizontal bar portion 21d of the stay 21 described later can be moved up and down at the lower end portion. Here, the holder 16 corresponds to a “holder portion” in the claims.

  As shown in FIGS. 1 to 5, a resin horizontal bar support member 18 is attached to the central portion of the reinforcing member 15 in the left-right direction. The horizontal bar support member 18 is a solid part having a substantially rectangular parallelepiped shape whose longitudinal direction is the vertical direction, and a mounting surface 18a to the reinforcing member 15 is formed on the lower rear side, and the left and right sides extending in the vertical direction at a substantially central portion in the front-rear direction. A movement allowing hole 18b which is a directional through hole is formed. In a longitudinal section obtained by cutting the horizontal bar support member 18 with a surface extending in the front-rear direction at the position of the middle portion in the left-right direction of the seat, the movement-permitting hole 18b has a longitudinal length that is about half of the vertical length of the headrest support 17. The length in the short direction is slightly longer than the diameter of the horizontal bar portion 21d. A holding recess 18c for fitting and holding the horizontal bar portion 21d is formed on the rear surface side in the vicinity of the lower end portion of the movement allowing hole 18b. The holding recess 18c is an opening whose front end communicates with the movement allowance hole 18b in a longitudinal section cut by a plane extending in the front-rear direction at the position of the middle portion in the left-right direction of the seat. A portion 18d is formed. When a part of the horizontal bar portion 21d is fitted in the holding recess 18c, the locking claw portions 18e at both the upper and lower end portions of the opening 18d are locked to a part of the horizontal bar portion 21d and the horizontal bar portion 21d. Is moved forward and held so as not to enter the movement allowance hole 18b. Here, the holding recess 18c and the locking claw portion 18e correspond to a “lock portion” in the claims. The movement allowable hole 18b corresponds to a “movement allowable portion” in the claims. Further, the horizontal bar support member 18 corresponds to a “resin molded body” in the claims.

  As shown in FIGS. 1 and 2, the headrest 20 includes a stay 21 as a member forming the skeleton, a headrest pad 20P as a cushion attached to the stay 21, and a skin material that covers the headrest pad 20P. And a headrest cover 20C. The stay 21 is formed of a pipe member having a circular cross section, and includes a pair of rod portions 21a, a pair of vertical portions 21b extending upward from the rod portions 21a, and a connecting portion 21c that connects the upper portions of the vertical portions 21b. Are provided as a unit. Each rod portion 21a of the stay 21 is a portion extending downward from the headrest pad 20P, and the horizontal bar portion 21d is welded or screwed or the like in a bridging manner at the lower end portion of the rod portion 21a while being inserted into the headrest support 17. Installed in. The lower end portion of each rod portion 21a is cut out in a shape corresponding to the cross section of the horizontal bar portion 21d in the left-right direction, and is firmly attached to the horizontal bar portion 21d in contact with a wide area. The horizontal bar portion 21d is a pipe member having a circular cross section extending in the left-right direction, and the length in the left-right direction is slightly longer than the length between the seat outer sides of the rod portions 21a. The headrest 20 is a type in which a headrest pad 20P is fixed to the stay 21. The headrest pad 20P is small and it is difficult to dispose a lock mechanism between the headrest 20 and the stay 21. In addition, a type in which the vertical position of the headrest pad 20P can be adjusted with respect to the stay 21 at a normal time may be used. However, in this type, a known height adjustment mechanism (the height adjustment mechanism between the stay 21 and the headrest pad 20P ( For example, Japanese Patent Application Laid-Open No. 2015-116950 is provided. Here, the rod portion 21a corresponds to a “stay portion” in the claims. Moreover, the part except the rod part 21a from the headrest 20 is equivalent to the "headrest main-body part" of a claim.

  A procedure for assembling the headrest 20 to the seat back 10 will be described. The horizontal bar portion 21d is inserted into the holding recess 18c from the horizontal direction of the horizontal bar support member 18, and the horizontal bar 21d is disposed so that the center in the horizontal direction of the horizontal bar portion 21d is located in the holding recess 18c. In this state, the mounting surface 18a of the horizontal bar support member 18 is brought into contact with the front side surface of the central portion in the left-right direction of the reinforcing member 15 and connected by screws or the like. Next, the back cover 10C is put on the back frame 11 via the back pad 10P, and the back cover 10C is connected to the back frame 11 by hogging or the like at a predetermined position such as a peripheral end portion of the back cover 10C or a groove portion of the back pad 10P. To do. At this time, an opening for passing the headrest support 17 is provided in advance at a position corresponding to the upper end opening of each holder 16 of the back cover 10C. The headrest support 17 is inserted and held from above in the inner tube portion of each holder 16 through the opening of the back cover 10C. At this time, the notch portion 17b of each headrest support 17 is a horizontal bar when the headrest support 17 is rotated slightly forward around the connection portion of the holder 16 to the upper side portion 12a of the upper frame 12 in a side view. The support member 18 is disposed at a position that coincides with the movement allowable hole 18b. This is because, as will be described later, when the headrest 20 is applied with a strong force from the head of the seated occupant to the rear at the time of a rear collision, each headrest support 17 is rotated integrally with each rod portion 21a of the stay 21. In this case, the movement allowance hole 18b and the cutout portion 17b are configured to coincide with each other in a side view. Next, each rod portion 21a of the stay 21 of the headrest 20 is inserted into each headrest support 17, and the lower end portion of each rod portion 21a is brought into contact with the left and right end portions of the horizontal rod portion 21d to weld or screw. Connect by tightening. In this state, the headrest 20 is held stationary with respect to the seat back 10 both vertically and forward. Thereafter, the back board and the like are attached and assembled so as to close the rear opening of the seat back 10.

  Based on FIGS. 1-8, the effect | action of the headrest support structure concerning this embodiment is demonstrated. As shown in the solid line in FIGS. 1 and 2 and FIGS. 3 and 6, the horizontal bar portion 21d of the stay 21 of the headrest 20 is fitted into the holding recess 18c of the horizontal bar support member 18 in the normal sitting state. Both front and rear are held stationary. Specifically, the upper and lower sides are immovable by the upper surface and the lower surface of the holding recess 18c, and the front and rear are immovable by the locking claw portion 18e and the rear surface of the holding recess 18c. The head PH of the seated person P is usually slightly separated from the surface of the headrest 20 and does not exert any pressure on the headrest 20. Even if the head PH is swung over the headrest 20, the locking claws 18e at both the upper and lower ends of the opening 18d of the holding recess 18c can be rotated even if the stay 21 tries to rotate with the holder 16 as a supporting point. There is no deformation, the horizontal bar 21d does not come off from the holding recess 18c, and it does not rotate.

  In this state, when the automobile receives a strong impact force due to a rear collision or the like, the head PH of the seated person P is strongly pressed against the front surface of the headrest 20 by the inertial force. Then, the stay 21 of the headrest 20 receives a pressing force at the upper part rearward and at the lower part forward with the holder 16 portion as a supporting point. This pressing force is extremely strong compared to the force that causes the head PH to sway against the headrest 20 at normal times, and the horizontal bar portion 21d cannot be held in the holding recess 18c, so that the upper and lower sides of the opening 18d of the holding recess 18c. The locking claw portions 18e at both ends are deformed and the horizontal bar portion 21d moves forward. FIG. 4 and FIG. 7 show this state. At this time, the headrest support 17 is deformed in the holder 16 and tilts rearward together with the rod portions 21 a of the stay 21. Therefore, the notch 17b of each headrest support 17 coincides with the movement allowance hole 18b of the horizontal bar support member 18 in a side view. That is, the horizontal bar portion 21d of the stay 21 is disposed below the movement allowance hole 18b of the horizontal bar support member 18 so that the stay 21 can be moved up and down. FIG. 7 shows a state in which the head PH of the seated person P is strongly pressed against the headrest 20 and the headrest pad 20P is deformed and sunk.

  As shown in the two-dot chain line in FIGS. 1 and 2 and FIGS. 5 and 8, the seat back 10 receives from the upper body PB of the seated person P while the head of the seated occupant is strongly pressed against the headrest 20. When the head is tilted backward by the pressing force toward the head, a force is applied to the head PH of the seated person P to rotate backward about the center of gravity of the head PH. At this time, since the horizontal bar portion 21d of the stay 21 of the headrest 20 is disposed below the movement allowance hole 18b of the horizontal bar support member 18, the headrest 20 moves upward relative to the seat back 10 and this force. Cancel. That is, since the headrest 20 moves relatively upward instead of the head PH of the seated person P being rotated backward, the neck portion of the seated person P is not burdened greatly and the occurrence of whiplash can be suppressed. .

  As mentioned above, although specific embodiment was described, this invention is not limited to those structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, the following can be mentioned.

  1. In the above embodiment, the holding concave portion 18c that is a lock portion and the movement allowance hole 18b that is a movement allowance portion are provided in one horizontal bar support member 18. However, the present invention is not limited thereto, and the holding recess 18c and the movement allowance hole 18b may be provided and integrated in separate members.

  2. In the above embodiment, the holding recess 18c is provided as a hole continuous with the movement allowance hole 18b through the opening 18d, and the locking claw portions 18e at the upper and lower ends of the opening 18d are deformed to deform the horizontal bar portion 21d. Is configured to be movable into the movement allowable hole 18b. However, the present invention is not limited to this, and the holding recess 18c is formed as a U-shaped recess having the same opening width as the horizontal bar portion 21d, and a separate elastic deformation member is attached to the opening and deformed when an impact load is applied. The rod portion 21d may be configured to allow movement into the movement allowance hole 18b.

  3. In the above-described embodiment, the horizontal bar support member 18 is formed in advance, and then the horizontal bar portion 21d is inserted and held in the holding recess 18c. However, the present invention is not limited to this, and the horizontal bar portion 21d may be integrally formed when the horizontal bar support member 18 is injection-molded.

  4). In the above embodiment, the opening 18d is provided between the holding recess 18c and the movement allowance hole 18b. However, the present invention is not limited to this, and a thin weakened portion may be provided between the holding recess 18c and the movement allowance hole 18b so as to be broken when an impact load is applied.

  5. In the above embodiment, the present invention is applied to an automobile seat, but may be applied to a seat mounted on a vehicle such as an airplane, a ship, or a train.

1 Car seat (vehicle seat)
10 Seat back 11 Back frame (seat back frame)
15 Reinforcing member 16 Holder (holder part)
17 Headrest support 18c Holding recess (holding hole, lock part)
18 Horizontal bar support member (resin molding)
18b Movement allowance hole (movement allowance part)
18d Opening 18e Locking claw part (lock part)
20 Headrest 20P Headrest pad 21 Stay 21a Rod part (stay part)
21d Horizontal bar P Seated person PB Upper body PH Head

Claims (3)

A headrest support structure for a vehicle seat,
A stay portion extending downward from the headrest body;
A holder portion disposed on the seat back frame for supporting the stay portion so as to be movable in the vertical direction and swingable in the front-rear direction with respect to the seat back frame;
A part of a horizontal bar portion which is disposed on the seat back frame below the holder portion and extends between the stay portions in a normal direction and which extends in the left and right direction cannot move in the vertical direction with respect to the seat back frame and is in the front and rear direction. A lock portion that is in an immovable locked state and moves in the unlocked state and moves the horizontal bar portion forward when an impact load is applied to the headrest body in the rear;
A movement allowing portion disposed on the seat back frame in front of the lock portion and guiding the horizontal bar portion so as to be movable in the vertical direction when the lock portion is unlocked and the horizontal bar portion moves forward. And a headrest support structure for a vehicle seat.   The vehicle seat headrest support structure according to claim 1, wherein the lock portion and the movement allowance portion are formed on a resin molded body fixed to the seat back frame. 3. The movement allowance portion according to claim 2, wherein the movement allowance portion is formed by a vertically long move allowance hole formed adjacent to the front side of the lock portion, and the lock portion is located on both upper and lower sides of an opening connected to the movement allowance portion. A headrest support structure for a vehicle seat having a weakening portion adjacent to a latching claw portion at an end portion or the movement allowing portion and configured by a holding hole that fits and holds the part of the horizontal bar portion.

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