JP2012071701A - Seat back lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat back lock device capable of maintaining an excellent engagement state even when an axial direction of a metallic mushroom-shaped striker engaged with the slit of a resin coated metallic plate like member is inclined with respect to the plate-like member.SOLUTION: A seat back lock device 1 provided to maintain an erected state of a seat back 6a of a seat 6 for a vehicle, comprises a hook member 2 keeping a slit 3a in an engaging plate part 3 and a striker 4 of mushroom shape having a shaft part 4a and an umbrella part 4b. The striker 4 has one end fixed to the seat back 6a. The hook member 2 is freely turnably mounted to a vehicle body through the medium of a rotary shaft 8. A recess 3d is formed on a vehicle rear side in an opposite area 3f on the engaging plate part 3 opposed to the umbrella part 4b when the slit 3a is brought into the engagement state with the shaft part 4a through the turning.

Description

  The present invention relates to a seat back lock device that holds an upright state of a seat back of a vehicle seat such as an automobile.

  Many retractable seats are used for automobile seats such as automobiles. Many structures have a stacking space behind a retractable sheet. Many of the retractable seats have a lock mechanism in the rotation mechanism of the seat back, but with such a configuration, the impact received by the seat back tends to concentrate on the lock mechanism portion, and the received impact This is disadvantageous in terms of strength compared to a fixed seat that disperses the material in the frame. Therefore, in the case of a vehicle type equipped with such a retractable seat and having a loading space that is susceptible to impact from the load at the time of rear-end collision, the seat back is kept upright to ensure the safety of the occupant. A certain level of strength is required. For this reason, conventionally, a seat back lock device has been conceived in which the upper portion of the seat back is fixed to the vehicle body and the standing state is maintained.

  FIG. 4 is a schematic perspective view of a vehicle seat provided with a conventional seat back lock device. As shown in FIG. 4, the seat back lock device 100 for the vehicle seat 160 is installed near both shoulders of the seat back 160a. Each seat back lock device 100 is configured by a pair of a mushroom type striker 140 that is an engagement pin and a hook member 120 that engages with the striker 140. In the seat back lock device 100 shown here, the striker 140 is fixed to the seat back 160a, and the hook member 120 is fixed to the vehicle body (not shown).

  Here, FIG. 5 shows an enlarged view of the seat back lock device 100 surrounded by a two-dot chain line in FIG. The mushroom type striker 140 is made of metal and has a shaft portion 140a and an umbrella portion 140b. The shaft portion 140a extends from the shoulder of the seat back 160a toward the outside in the vehicle width direction, and the umbrella portion 140b is formed on the vehicle outer side which is the free end side of the shaft portion 140a.

  On the other hand, the hook member 120 has a plate-like engagement plate portion 130 that extends in a direction substantially orthogonal to the shaft portion 140a of the striker 140, that is, substantially parallel to the side surface of the vehicle. The engagement plate portion 130 is formed with a curved U-shaped slit 130a that is cut inwardly from one end of the periphery.

  Although not shown here, the hook member 120 is rotatably attached to the inner wall on the vehicle body side via a rotary shaft 180. By rotating in the direction of the arrow 190 shown in the figure, the hook member 120 and Can be engaged. By this engagement, even when the load loaded on the rear of the vehicle moves to the front side of the vehicle in the event of a collision and collides with the back of the seat back 160a, the seat back 160a is provided on the seats provided on both shoulders. Since it is fixed by the backlock device 100, the standing state can be satisfactorily maintained. Such a configuration is disclosed in Patent Document 1.

JP 2008-308094 A

  However, in the seat back lock device 100 as described above, when the engagement plate portion 130 is formed of a resin-coated metal member, the engagement between the striker 140 and the hook member 120 is caused by damage of the resin layer. Mismatch may occur. Hereinafter, this disengagement will be described with reference to FIG.

  6 is a cross-sectional view of the seat back lock device 100 of FIG. 6A shows a normal engagement state, and FIG. 6B shows an impact from the back of the seat back 160a in which the vicinity of the center of the seat back 160a is curved toward the front side of the vehicle. The engagement state is shown. Along with the deformation of the seat back 160a, the end of the striker 140 on the seat back fixed end side (vehicle inner side) also tilts toward the vehicle front side. Moreover, the umbrella part 140b rotates in the direction of the arrow 200 on the vehicle outer side of the shaft part 140a. Accordingly, a part of the periphery of the umbrella portion 140b on the vehicle rear side 140c is recessed into the resin layer 130c of the engagement plate portion 130. The resin layer 130 c is crushed between the metal striker 140 and the base portion 130 b that is the core of the engagement plate portion 130, and the contact portion is damaged.

  Here, if the range occupied by the resin material that is crushed and pushed away by the umbrella portion 140b is large, the resin escaping from the outside of the vehicle to the inside of the vehicle through the inside of the slit 130a also moves accordingly. Distortion increases around 130a and cracks tend to occur. Further, when the degree of cracking is large, the resin material around the slit 130a may partially peel off and fall off. When this happens, the slit width is expanded by the thickness of the resin layer 130c that has been peeled off, and the shaft portion 140a and the engagement plate portion 130 are easily disengaged, making it difficult to safely protect the occupant.

  Therefore, as the resin layer 130c is thicker, the allowable value for the moving width of the umbrella portion 140b to be embedded increases, and as a result, the distortion generated in the resin layer 130c on the side opposite to the side on which the umbrella portion 140b directly contacts is larger. In the present invention, it is good even when the axial direction of the metal mushroom striker that engages the slit of the resin-coated metal plate member is inclined with respect to the plate member. It is an object of the present invention to provide a seat back lock device capable of maintaining the engaged state.

In order to achieve the above object, the seat back lock device of the present invention comprises:
One is fixed to the vehicle body, the other is fixed to the seat back of the vehicle seat, and is an apparatus composed of a pair of members that locks the seat back in an upright state by engagement between the two.
A hook member having an engagement plate portion formed of a metal base portion and a resin outer layer, in which a slit portion is formed in a curved U shape inwardly from one end of the peripheral edge, extending in a plate shape substantially parallel to the vehicle side surface; A seat comprising a shaft portion extending in the vehicle width direction and a umbrella portion extending substantially parallel to the engagement plate portion, the hook member being engaged with the shaft portion at the slit portion. In the backlock device,
In the virtual arrangement state in which only the shaft portion tilts the vehicle inner end portion toward the vehicle front side at least with respect to the hook member whose direction is fixed in the facing region on the engaging plate portion where the back surface of the umbrella portion faces when engaged. A concave portion is formed in a region including a point where the distance from the periphery of the umbrella portion is reduced most.

  With this configuration, when the vehicle inner end portion of the shaft portion tilts toward the vehicle front side due to deformation of the vehicle body, the periphery of the umbrella portion is located inside the concave portion formed in the opposing region of the engagement plate portion shape. Abut.

  That is, in the configuration in which the striker is installed on the vehicle body side, a recess is formed on the vehicle front side of the engagement plate portion, and when the umbrella portion side extending toward the inside of the vehicle is tilted forward, the engagement plate portion A peripheral portion on the vehicle front side of the umbrella portion that shortens the distance from the facing surface is in contact with the engagement plate portion inside the recess.

  Further, in the configuration in which the striker is installed on the seat back side, a recess is formed on the vehicle rear side of the engagement plate portion, and when the end portion on the side fixed to the seat back is tilted forward of the vehicle, A peripheral portion on the vehicle rear side of the umbrella portion that reduces the distance from the facing surface of the plywood portion contacts the engagement plate portion inside the recess.

  This prevents interference between the resin material coating the engaging plate and the back surface and the periphery of the umbrella until the shaft reaches the rotational position where the periphery of the umbrella contacts the inside of the recess. Therefore, the degree of deformation of the resin layer can be kept low.

  As described above, according to the present invention, even when the vicinity of the center of the seatback is curved toward the front side of the vehicle due to an impact from the back, the periphery of the umbrella portion of the striker has a constant axial direction. Until it is inclined to the above angle, it does not contact the resin layer of the hook member. As a result, the resin layer can be prevented from being deformed due to the movement of the umbrella portion until immediately before the umbrella portion abuts on the resin layer. , Deformation of the resin layer causing cracks is minimized. As a result, it is possible to prevent a part of the resin material from dropping off due to the crack and to increase the interval of the slit width, so that the engagement state of the striker with the hook member can be kept good.

It is a perspective view showing a seat back lock device in a 1st embodiment of the present invention. It is sectional drawing which showed the engagement state at the time of a deformation | transformation of the seat back lock apparatus of FIG. It is a perspective view which shows the seat back lock apparatus in the 2nd Embodiment of this invention. It is the schematic of the vehicle seat which has a conventional seat back lock device. FIG. 5 is an enlarged view of the seat back lock device of FIG. 4. It is sectional drawing which showed the engagement state at the time of a deformation | transformation of the seat back lock apparatus of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
A seat back lock device according to a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view schematically showing a seat back lock device according to a first embodiment of the present invention. As shown in this figure, the seat back lock device 1 according to the present embodiment includes a striker 4 and a hook member 2. The striker 4 is formed in a mushroom type having a shaft portion 4a extending outward from the shoulder of the seat back 6a in the vehicle width direction and an umbrella portion 4b formed on the free end side of the shaft portion 4a. Further, the hook member 2 has an engagement plate portion 3 extending in a direction substantially orthogonal to the shaft portion 4a of the striker 4, that is, substantially parallel to the vehicle side surface, and the engagement plate portion 3 has a lower end portion thereof. A curved U-shaped slit 3a cut from is formed.

  The hook member 2 is attached to a vehicle body (not shown) so as to be rotatable about a rotation shaft 8, and the seat back 6a is attached to the vehicle body by being rotationally engaged with the shaft portion 4a by the slit 3a. Locked. At the time of engagement, the direction in which the umbrella part 4b spreads and the direction in which the engagement plate part 3 spreads are substantially parallel.

  In FIG. 1, the state before the slit 3a of the engaging plate part 3 is engaged with the shaft part 4a of the striker 4 is shown. As shown in the drawing, in the engagement plate portion 3 of the hook member 2 in the present embodiment, a recess 3d is formed on the periphery of the slit 3a. A region surrounded by a two-dot chain line in the engagement plate portion 3 in the drawing is a facing region 3f that faces the back surface of the umbrella portion 4b during engagement. As can be seen from FIG. 1, the recess 3d is formed on the vehicle rear side in the facing region 3f.

  Here, FIG. 2 shows a cross-sectional view of the seat back lock device 1 when the vicinity of the center of the seat back 6a is curved toward the front side of the vehicle due to an impact from a load received during a rear-end collision or the like. FIG. 2A shows an engagement state in a normal state, and FIG. 2B shows an engagement state when the axial direction of the striker 4 is inclined with respect to the hook member 2 due to a collision or the like.

  As can be seen from FIG. 2 (b), when the vicinity of the center of the seat back 6a is pushed forward of the vehicle, the shaft portion 4a of the striker 4 has an end portion on the side fixed to the seat back 6a (an end on the vehicle inner side). Part) moves to the front side of the vehicle, and is inclined as compared with the state of FIG. Due to this vehicle deformation, the shaft portion 4a of the striker 4 has a tension acting in the axial direction indicated by the arrow 10 in FIG. 2B and a rotational force acting in the direction indicated by the arrow 12 around the slit 3a. Has occurred.

  Here, paying attention to the engagement plate portion 3 around the slit 3a, the peripheral portion 4d on the vehicle rear side of the umbrella portion 4b is accommodated inside the concave portion 3d formed on the vehicle rear side. As is apparent from FIGS. 2 (a) and 2 (b), the recess 3d is formed so that its depth increases as it moves away from the slit 3a toward the vehicle rear side. Thereby, the back surface 4c of the umbrella part 4b of the striker 4 rotated with the deformation of the seat back 6a and the inclined surface 3g inside the recess 3d are in contact with each other at an angle close to parallel. The resin layer 3c covering the surface of the engagement plate portion 3 on the vehicle rear side is not distorted, and neither the slit 3a nor the resin layer 3c facing the vehicle interior is deformed.

  That is, by providing the concave portion 3d, the vehicle-side peripheral portion 4d and the back surface 4c of the umbrella portion 4b do not come into contact with the inner surface of the resin layer 3c until the rotational position shown in the drawing is reached. Rather, they come into contact only when they reach this rotational position. Accordingly, the resin layer 3c is not crushed or pushed away with the rotation of the umbrella portion 4b, and no distortion occurs on the inner surface of the slit 3a and the surface of the engagement plate portion 3 on the inner side of the vehicle.

  As described above, the recess 3d is formed in the facing region 3f on the rear side of the vehicle and around the slit 3a on which the shape of the umbrella 4b is projected, so that the resin layer 3c on the vehicle inner side of the engagement plate 3 is cracked. It is possible to prevent the occurrence of distortion causing the occurrence of

  Moreover, since it can prevent that a distortion and a crack arise and can prevent generation | occurrence | production of peeling of the resin layer 3c, it can prevent the expansion of the slit width based on this peeling and dropping, As a result, the striker 4 and the hook member 2 It is possible to prevent disengagement.

  Furthermore, in the present embodiment, the deepest portion of the recess 3d is formed so that the coating thickness is thin, so that a larger tension is applied in the axial direction from the state of FIG. However, the peripheral portion 4d of the umbrella portion 4b comes into contact with the base portion 3b, which is the core material, as soon as the thin coating is broken. Thereby, since the sink of the umbrella part 4b with respect to the engagement board part 3 can be prevented, the resin layer 3c which forms the inclined surface 3g is not pushed away by the back surface 4c of the umbrella part 4b. That is, even if the portion where the thin coating is formed is torn, a large distortion that leads to cracking or peeling of the resin layer 3c is not caused, and damage to the resin layer 3c can be minimized, which is favorable. It is possible to maintain a simple engagement state.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 3 is a perspective view showing a seat back lock device according to a second embodiment of the present invention. In the present embodiment, unlike the seat back lock device 1 shown in FIG. 1 in the first embodiment, the striker 4 is attached to the vehicle body, and the hook member 2 is attached to the shoulder of the seat back 6a. Since the shape of each member is the same as that of the seat back lock device 1 shown in the first embodiment except that the attachment positions are different, the same reference numerals are used for the same members here. The explanation will be given.

  In the present embodiment, as described above, the striker 4 and the hook member 2 are different from each other in that the striker 4 and the hook member 2 are arranged oppositely to the first embodiment. The engaging plate portion 3 of the hook member 2 has a recess 3d formed on the vehicle front side of the slit 3a.

  By being configured in this manner, when a load or the like collides from behind the seat back 6a due to a rear-end collision or the like, and the vicinity of the center of the seat back 6a is curved toward the front side of the vehicle, the hook member 2 that moves together with the seat back 6a The umbrella 4b side of the striker 4 is pulled toward the front side of the vehicle. Thereby, the longitudinal direction of the shaft part 4a is inclined with the umbrella part 4b facing the vehicle front side. At this time, the back surface 4c of the umbrella part 4b rotates from the vehicle outer side to the vehicle rear side, and the vehicle front side of the umbrella part 4b approaches the opposing surface of the engagement plate part 3.

  Thus, in the configuration according to the present embodiment, contrary to the first embodiment, the peripheral portion 4d on the vehicle front side of the umbrella portion 4b approaches the facing region 3f on the engagement plate portion 3. Here, in the engagement plate portion 3 included in the hook member 2 of the seat back lock device 1 according to the present embodiment, a recess 3d is formed on the vehicle front side with respect to the position where the slit 3a is formed. Therefore, it is possible to obtain the same effect as the seat back lock device 1 of FIG. 1 shown in the first embodiment.

  In addition, in the recess 3d of the engagement plate portion 3 shown in each of the above embodiments, an example is shown in which an inclined surface 3g having a linear cross section is formed so as to increase in depth as the distance from the slit 3a increases. However, the present invention is not limited to this, and any other shape may be used as long as the back surface 4c of the umbrella portion 4b and the recess 3d (engagement plate portion) are in wide contact and can disperse the contact pressure.

  For example, it may be a convex curved surface having a gentle cross section, and a concave portion may be formed as a whole so as to increase its depth as the distance from the slit increases. With such a configuration, since the concave portion is formed as a whole, the amount of resin pushed away by the back surface of the umbrella portion can be reduced, and in the course of rotation, at any rotation angle, Therefore, it is possible to stably prevent the concentration of the local pressing force stably.

  Further, a part of the metal base 3b may be exposed inside the recess 3d. For example, if the exposed portion is provided at a position where the depth is the deepest, when the peripheral edge on the back surface 4c side of the umbrella portion 4b comes into contact, the sinking as in the resin layer 3c does not occur. That is, since the movement of the striker 4 in the axial direction other than the rotation is suppressed, it is possible to suppress the influence on the resin layer 3c around the slit 3a.

  The seat back lock device of the present invention can be suitably used for a vehicle seat lock structure.

DESCRIPTION OF SYMBOLS 1 Seat back lock device 2 Hook member 3 Engagement plate part 3a Slit 3b Base part 3c Resin layer 3d Recess 3e Periphery 3f Opposite area 3g Inclined surface 4 Striker 4a Shaft part 4b Umbrella part 4c Back surface 4d Peripheral part 6 Vehicle seat 6a Seat back

Claims (1)

One is fixed to the vehicle body, the other is fixed to the seat back of the vehicle seat, and is an apparatus composed of a pair of members that locks the seat back in an upright state by engagement between the two,
A hook member having an engagement plate portion formed of a metal base portion and a resin outer layer, in which a slit portion is formed in a curved U shape inwardly from one end of the peripheral edge, extending in a plate shape substantially parallel to the vehicle side surface; A mushroom-type striker having a shaft portion that is fixedly held and extends in the vehicle width direction and an umbrella portion that extends substantially parallel to the engagement plate portion, and the hook member is engaged with the shaft portion at the slit portion. In the seat back lock device that can be combined,
Of the opposing region on the engagement plate portion where the back surface of the umbrella portion opposes at the time of engagement, at least the shaft portion tilts the vehicle inner end toward the vehicle front side with respect to the hook member whose orientation is fixed. A seat back lock device, wherein a concave portion is formed in a region including a point where the distance from the periphery of the umbrella portion is reduced most in the virtual arrangement state.