Headrest stay locking mechanism

Abstract

To obtain a lock structure of a headrest stay which can suppress unlocking of a stay member without increasing the number of components.SOLUTION: A lock structure of a headrest stay includes: a headrest body which supports the head of an occupant; a stay member 52 which is formed by bending a pipe, supports the headrest body, and has end sections 52C (52C1, 52C2) on both end sides which are respectively inserted into cylindrical support members mounted on a back frame for supporting a back section of the occupant; a slit 54 which is formed in at least one end section 52C of the end sections 52C (52C1, 52C2) on both end sides of the stay member 52 and is cut out orthogonally to an axial direction of the end section 52C along an outer peripheral surface on a side facing the other end section 52C on the outer peripheral surface; and a lock member which is provided at a position corresponding to the slit 54 in the support member and fits into the slit 54.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a locking structure for a headrest stay. [Background technology]

[0002] In the headrest described in Patent Document 1 below, when an attempt is made to pull the stay member out of the support member, the suppression portion comes into contact with the end of the support member, preventing the stay member from being pulled out of the support member. Furthermore, the support end of the cantilever is supported by the cylindrical portion, preventing the cantilever from tilting, and preventing the stopper member from being pulled out of the stay member. This simple configuration prevents the headrest from coming off the back frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-74286 Summary of the Invention [Problem to be solved by the invention]

[0004] In a split-type vehicle rear seat, for example, with a 60:40 split, the seatback is split near the center seat. Therefore, of the two support members into which both ends of the center seat's stay member are inserted, the support member located on the split side may be located in the curved portion of the back frame, i.e., the portion that curves downward. This may prevent welding to secure the support member to the back frame, resulting in a cantilevered structure. When the two support members are secured to the back frame in this cantilevered structure, for example, if luggage in the luggage compartment collides with the back of the seatback due to inertial force during sudden deceleration of the vehicle, the stay member may twist, creating an angle difference between the two ends of the stay member, and the stay member may become unlocked from the support member.

[0005] One possible solution to make it harder to release the lock would be to add a locking member, but this would increase the number of parts, which would increase costs and require a new step in the assembly process for assembling the stay member. Furthermore, adding a new step would also require a step to check for missed work, making the assembly and quality check work more complicated.

[0006] In consideration of the above, an object of the present invention is to provide a locking structure for a headrest stay that can prevent the stay member from being unlocked without increasing the number of parts. [Means for solving the problem]

[0007] The locking structure of a headrest stay of a first aspect of the present invention includes: a headrest main body that supports the head of an occupant; a stay member formed by bending a pipe, and having both end portions inserted into tubular support members that support the headrest main body and are attached to a back frame that supports the back of the occupant; a slit formed in at least one of the both end portions of the stay member, and cut along the outer peripheral surface of the side facing the other end portion, perpendicular to the axial direction of the end portion; and a locking member provided in a position corresponding to the slit in the support member, and fitted into the slit.

[0008] In a split-type vehicle rear seat, for example, with a 60:40 split, the seatback is split near the center seat. Therefore, of the two support members into which both ends of the center seat's stay member are inserted, the support member located on the split side may be located in the R portion of the back frame, i.e., the portion that curves downward. This may prevent welding to secure the support member to the back frame, resulting in a cantilevered structure. When the two support members are secured to the back frame in this cantilevered structure, for example, if luggage in the luggage compartment collides with the back of the seatback due to inertial force during sudden deceleration of the vehicle, the stay member may be twisted, resulting in an angle difference between both ends of the stay member.

[0009] The headrest stay locking structure of the first aspect includes a slit formed on at least one of the two end portions of the stay member, cut along the outer circumferential surface on the side facing the other end, perpendicular to the axial direction of the end portion, and a locking member provided in a position corresponding to the slit in the support member and fitted into the slit, so that the stay member is locked to the back frame by the locking member fitting into the slit. Therefore, even if the stay member twists and rotates during the collision, the locking member can fit into the slit formed along the outer circumferential surface, preventing the stay member and the support member from being unlocked. This makes it possible to prevent the stay member from being unlocked without increasing the number of parts.

[0010] In addition, the locking structure for a headrest stay of a second aspect is the same as that of the first aspect, wherein the slit is cut out in a range of 100° to 140° around the axis of one of the ends.

[0011] In the locking structure of the headrest stay of the second aspect, the slit is cut out in a range of 100° to 140° around the axis of one end, so that the strength of the stay member can be maintained and the stay member can be prevented from becoming unlocked without increasing the number of parts.

[0012] Furthermore, the locking structure for a headrest stay of a third aspect is the same as that of the first aspect, wherein the slit is cut out in a range of 110° to 130° around the axis of one of the ends.

[0013] In the locking structure of the headrest stay of the third aspect, the slit is cut out in a range of 110° to 130° around the axis of one end, and therefore, the strength of the stay member can be maintained more favorably than in the second aspect, and the stay member can be prevented from becoming unlocked without increasing the number of parts.

[0014] In addition, the locking structure for a headrest stay of a fourth aspect is the same as that of the first aspect, wherein the slit is cut out over a range of 120° around the axis of one of the ends.

[0015] In the locking structure of the headrest stay of the fourth aspect, the slit is cut out within a range of 120° around the axis of one end, and therefore, it is possible to prevent the stay member from becoming unlocked without increasing the number of parts while maintaining the strength of the stay member more suitably than in the second and third aspects.

[0016] Furthermore, the locking structure of the headrest stay of a fifth aspect is any one of the first to fourth aspects, and includes an elastic member that biases the locking member toward the slit, and a pressing member that presses the elastic member in the direction opposite to the biasing direction.

[0017] The locking structure for the headrest stay of the fifth aspect includes an elastic member that biases the locking member toward the slit and a pressing member that presses the elastic member in the direction opposite to the biasing direction. Therefore, the locking member is pressed by the elastic member while fitted into the slit, so that the locked state of the stay member can be maintained. Furthermore, by pressing the elastic member in the direction opposite to the biasing direction with the pressing member, the locking member can be removed from the slit and the locked state of the stay member can be released.

[0018] Furthermore, the locking structure of the headrest stay of the sixth aspect is any one of the first to fifth aspects described above, in which the back frame is provided on the first seat back of a split-type rear seat for a vehicle having a first seat back with seats for two people and a second seat back with a seat for one person, and the stay member is provided on a center seat located on the center side of the first seat back.

[0019] In the headrest stay locking structure of the sixth aspect, the slit is formed in a stay member used for the center seat located at the center of the first seat back of a split-type vehicle rear seat having seats for two people. Therefore, the slit can be provided in the stay member that is likely to twist when, for example, luggage in the luggage compartment collides with the back of the seat back due to inertial force during sudden deceleration of the vehicle.

[0020] Furthermore, the locking structure of the headrest stay of the seventh aspect is any one of the first to sixth aspects, further comprising a bracket to which the support member is fixed and which is fixed to the back frame only on one side in the vehicle width direction, and the slit is formed at the end on the other side in the vehicle width direction.

[0021] The locking structure for a headrest stay of the seventh aspect further includes a bracket to which the support member is fixed and which is fixed to the back frame on only one side in the vehicle width direction, and the slit is formed in the end on the other side in the vehicle width direction. That is, the bracket has a cantilever structure with respect to the back frame, and the slit is formed in the end on the side that is not supported by the cantilever structure. Therefore, when two support members are fixed to the back frame by a cantilever structure, the slit can be provided in the stay member that is most likely to twist.

[0022] In addition, the locking structure of the headrest stay of the eighth aspect is the same as in the sixth aspect, except that it further includes a bracket to which the support member is fixed and which is fixed to the back frame only on the side opposite to the first seat back in the vehicle width direction, and the slit is formed at the end on the second seat back side.

[0023] The locking structure for a headrest stay of an eighth aspect further includes a bracket to which a support member is fixed and which is fixed to the back frame only on the side opposite the first seat back in the vehicle width direction, and the slit is formed in the end portion on the second seat back side. That is, the bracket has a cantilever structure in which the side opposite the first seat back in the vehicle width direction is supported by the back frame, and the slit is formed in the end portion on the side not supported by this cantilever structure. Therefore, when two support members are fixed to the back frame by a cantilever structure, the slit can be provided in the stay member that is most likely to twist. [Effects of the Invention]

[0024] As described above, according to the locking structure for a headrest stay of the first aspect, it is possible to prevent the stay member from becoming unlocked without increasing the number of parts.

[0025] According to the locking structure for the headrest stay of the second aspect, it is possible to prevent the stay member from becoming unlocked while maintaining the strength of the stay member and without increasing the number of parts.

[0026] According to the locking structure for the headrest stay of the third aspect, it is possible to prevent the stay member from becoming unlocked without increasing the number of parts, while maintaining the strength of the stay member more suitably than the second aspect.

[0027] According to the locking structure of the headrest stay of the fourth aspect, it is possible to prevent the stay member from becoming unlocked without increasing the number of parts, while maintaining the strength of the stay member more suitably than the second and third aspects.

[0028] According to the locking structure for the headrest stay of the fifth aspect, the locked state of the stay member can be maintained, and the locked state of the stay member can be released.

[0029] According to the locking structure for the headrest stay of the sixth aspect, the slits can be provided in the stay member that is likely to twist.

[0030] According to the locking structure for a headrest stay of the seventh aspect, the slit can be provided in the stay member that is most likely to twist.

[0031] According to the locking structure for a headrest stay of the eighth aspect, the slit can be provided in the stay member that is most likely to twist. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a perspective view of a vehicle rear seat according to an embodiment of the present invention. [Figure 2] 1 is a front view of a rear seat back frame to which a locking structure for a headrest stay according to an embodiment of the present invention is applied. [Figure 3] FIG. [Figure 4] FIG. 4 is an enlarged view of the main part of FIG. 3. [Figure 5] FIG. 5 is a front view of FIG. [Figure 6] FIG. 2 is an enlarged perspective view of a main part including a locking structure of the headrest stay according to the embodiment. [Figure 7] 3 is an enlarged front view of a main part including a partial cross section of the locking structure of the headrest stay according to the embodiment of the present invention. FIG. [Figure 8] FIG. 8 is a top view of FIG. [Figure 9] FIG. [Figure 10] FIG. 2 is a partially exploded perspective view of the main part of the locking portion. [Figure 11] FIG. 2 is a perspective view of a main part including a locking member and a slit. [Figure 12] FIG. 10 is an enlarged perspective view of a main part of a conventional stay member. [Figure 13] FIG. 10 is a front view of a main part of a conventional stay member. DETAILED DESCRIPTION OF THE INVENTION

[0033] 1 to 11, a rear seat 10 will be described as a vehicle seat to which a locking structure for a headrest stay according to one embodiment of the present invention is applied. Note that the arrows FR, RH, and UP shown as appropriate in each drawing indicate the forward, rightward, and upward directions of the rear seat 10, respectively. In this embodiment, the front-rear, left-right, top-bottom directions of the rear seat 10 coincide with the front-rear, left-right, top-bottom directions of the vehicle (automobile) in which the rear seat 10 is mounted. Hereinafter, when the front-rear, left-right, top-bottom directions are simply used in the description, they will refer to the front and back of the seat front-rear direction, the left and right of the seat left-right direction (seat width direction), and the top and bottom of the seat up-down direction.

[0034] <Vehicle seat configuration> First, the configuration of a rear seat 10 to which the vehicle seat according to this embodiment is applied will be described.

[0035] 1, in this embodiment, for example, the rear seat 10 is a second- or third-row seat and is a three-seater seat. The rear seat 10 is provided with a seat cushion 12 that supports the thighs and waists of the three seated occupants. The rear seat 10 is also provided with a seat back 14 that is provided on the rear end side of the seat cushion 12 and supports the upper bodies of the three seated occupants.

[0036] The seat back 14 includes a right seat back 16 and a left seat back 18 that are adjacent to each other in the left-right direction of the seat (vehicle width direction) and are tiltable independently of each other about an axis along the seat width direction. In this embodiment, the dimensional ratio of the right seat back 16 to the left seat back 18 in the vehicle width direction is set to, for example, 60:40.

[0037] The right seatback 16 is a first seatback with two-seat capacity, and includes a right seat 16A on the right side and a center seat 16B on the left side, i.e., in the center. The left seatback 18 is a second seatback with one-seat capacity, and includes a left seat 18A.

[0038] The right seat 16A, the center seat 16B, and the left seat 18A each have a headrest body 20 at the upper end thereof that can be raised and lowered to support the head of the occupant.

[0039] (seat back) Here, we will explain the configuration of the right seatback 16. The left seatback 18 has substantially the same configuration as the right seatback 16 except that it does not have a center seat 16B, so the same components as those in the right seatback 16 are denoted by the same reference numerals and will not be explained further.

[0040] 2, the right seatback 16 includes a frame-shaped right seatback frame 26 that constitutes the outer edge of the right seatback 16, and a plate-shaped right seatback panel 28 that is attached to the back surface of the right seatback frame 26. The right seatback panel 28 is formed, for example, by press-forming a metal plate, and is attached to the back surface of the right seatback frame 26 by means of welding or the like.

[0041] In this embodiment, the right seatback frame 26 includes an upper frame (upper skeleton member) 26A, a lower frame (lower skeleton member) 26B, a right side frame (outer skeleton member) 26C, and a left side frame (hinge skeleton member) 26D. In the right seatback 16 of this embodiment, a plurality of reinforcements (skeletal members) 26E are provided between the right side frame 26C and the left side frame 26D, and between the upper frame 26A and the lower frame 26B.

[0042] The lower frame 26B is provided at the lower end of the right seatback frame 26 along the seat width direction, and a reclining hinge bracket (not shown) is attached to it, which rotates the right seatback 16 relative to the seat cushion 12 (see Figure 1).

[0043] A connecting portion 30 is provided between the right seat back 16 and the left seat back 18, allowing the right seat back 16 and the left seat back 18 to tilt independently. The connecting portion 30 will be described below.

[0044] A right seatback bracket 32 ​​is disposed at the connection between the lower frame 26B of the right seatback 16 and the left side frame 26D. The right seatback bracket 32 ​​is formed in a box shape that is open on the right seatback 16 side and on the upper side, and is fixed to the left side frame 26D so as to cover the left side frame 26D from the left seatback 18 side. For example, welding or other means is used for fixing.

[0045] A hinge bracket 34 is provided at the lower end of the right side frame 26C of the left seat back 18. The hinge bracket 34 is formed in a box shape that is open on the left seat back 18 side and on the upper side. The hinge bracket 34 is provided with a through hole (not shown) through which a pin 38 is inserted, and is fixed to the lower frame 26B via a fixing bracket 36. For example, welding or other means is used for fixing.

[0046] Furthermore, a center hinge bracket 40 is disposed between the right seatback bracket 32 ​​and the hinge bracket 34. The center hinge bracket 40 has a hole (not shown) through which a pin 38 is inserted, and is fixed to a vehicle body floor (not shown) by means of bolt fastening or the like. The center hinge bracket 40 rotatably supports the pin 38 in the hole. In other words, the pin 38 supported in the hole of the center hinge bracket 40 is rotatably disposed between the right seatback bracket 32 ​​and the hinge bracket 34.

[0047] Additionally, a headrest portion 42 and a central headrest portion 50 are provided on the upper frame 26A of the right seat back 16. The headrest portion 42 includes a first stay member 44 that supports the headrest main body 20. The first stay member 44 is formed by bending a pipe, and both end portions thereof are inserted into first support members 46, which will be described later.

[0048] The first support member 46 includes a cylindrical metal headrest bushing 48 and a resin bushing 48A that is inserted through the headrest bushing 48 and has a head at the upper end. The headrest bushing 48 is fixed to the upper frame 26A via a first base bracket 49 by welding or the like.

[0049] Next, the central headrest portion 50 will be described in detail. The central headrest portion 50 includes a second stay member 52 serving as a stay member that supports the headrest main body 20. FIG. 3 is a perspective view of the second stay member 52. As shown in FIG. 3, the second stay member 52 is formed by bending a pipe, and includes a central portion 52A extending in the vehicle width direction and a rear portion 52B extending obliquely from both ends of the central portion 52A toward the rear and upper side. The second stay member 52 also includes an end portion 52C extending downward from the rear end of the rear portion 52B. In this embodiment, the end portion 52C located on the right side in the vehicle width direction is referred to as a right end portion 52C1, and the end portion 52C located on the left side in the vehicle width direction is referred to as a left end portion 52C2.

[0050] FIG. 4 is an enlarged view of the main portion of FIG. 3, specifically, an enlarged view of the main portion of the left end portion 52C2. FIG. 5 is a front view of FIG. 4. As shown in FIGS. 3 to 5, the left end portion 52C2 has a slit 54 cut along the outer peripheral surface on the side facing the right end portion 52C1, the slit 54 being perpendicular to the axial direction of the left end portion 52C2 of the stay member 52. The slit 54 is cut out over a range of 120° around the axis of the left end portion 52C2. That is, the slit 54 is formed so as to extend 60° forward and 60° rearward, respectively, around a plane including the axes of the right end portion 52C1 and the left end portion 52C2. For example, the slit 54 is formed to a depth of approximately 1.5 mm when the diameter of the stay member 52 is 12.7 mm.

[0051] The second stay member 52 configured as described above is inserted into a second support member 60 serving as a support member. The second support member 60 will now be described in detail with reference to Figures 6 to 11. As shown in Figure 6, the second support member 60 is made up of a right support member 60A disposed on the right side in the vehicle width direction and a left support member 60B disposed on the left side in the vehicle width direction.

[0052] The right support member 60A and the left support member 60B respectively support the right end 52C1 and the left end 52C2 of the second stay member 52. The right support member 60A includes a headrest bushing 62, a right headrest holder 64, and a stopper member 65. The headrest bushing 62 is formed in a cylindrical shape from a metal material. The headrest bushing 62 has a notch 62A that extends downward from the upper end and has a semicircular tip.

[0053] The right headrest holder 64 is molded from a resin material into a cylindrical shape, and has an elliptical cylindrical head portion 64A at its upper end, which has an outer diameter larger than that of the general portion. The right headrest holder 64 also has a tongue portion 64B extending downward from the lower end of the head portion 64A and having a semicircular tip. This tongue portion 64B fits into the notch portion 62A of the headrest bushing 62 described above. The lower end of the right headrest holder 64 is tapered.

[0054] The stopper member 65 is made of a resin material, and is inserted into the right headrest holder 64 from the tapered lower end side of the right headrest holder 64. Although not shown, the stopper member 65 and the right headrest holder 64 are provided with engaging portions that engage with each other, and when the stopper member 65 is inserted into the right headrest holder 64, the stopper member 65 is engaged with the right headrest holder 64 by the engaging portion.

[0055] 7, the rear side of the headrest bush 62 is fixed to a bracket 70 by welding W. The bracket 70 will be described in detail later.

[0056] The left support member 60B includes a headrest bushing 62, a left headrest holder 66, and a stopper member 65. The headrest bushing 62 and the stopper member 65 have the same structure as the headrest bushing 62 and the stopper member 65 of the right support member 60A described above, and therefore a description thereof will be omitted here.

[0057] The left headrest holder 66 is made of resin and has a cylindrical shape, with an elliptical cylindrical head portion 66A at its upper end, which has an outer diameter larger than that of the general portion. The left headrest holder 66 also has a tongue portion 66B extending downward from the lower end of the head portion 66A and having a semicircular tip. This tongue portion 66B fits into the notch portion 62A of the headrest bushing 62 described above. The lower end of the left headrest holder 66 is tapered.

[0058] As shown in Fig. 6, a mounting hole 66C for mounting a locking unit 80 (described later) is provided at the left end of the head 66A of the left headrest holder 66, and the locking unit 80 is mounted in this mounting hole 66C. The locking unit 80 will now be described. Fig. 9 is a perspective view of the main part of the locking unit 80, and Fig. 10 is a partially exploded perspective view of the main part of the locking unit 80.

[0059] 8 and 9, a locking part 80 is attached to the head 66A of the left headrest holder 66 so as to be movable back and forth in a direction perpendicular to the left end part 52C2 of the second stay member 52. As shown in Fig. 10, the locking part 80 includes a pressing member 82, a locking member 86, and an elastic member 88.

[0060] The pressing member 82 has an operating portion 82A formed in a substantially rectangular parallelepiped shape that is pressed by the occupant. The pressing member 82 also has a rectangular portion 84 that extends on the side opposite to the operating surface of the operating portion 82A, i.e., to the right in the vehicle width direction, and has a through-hole 84A that penetrates vertically therethrough. The rectangular portion 84 has an insertion hole 84B that penetrates in the front-rear direction at its right end, through which the locking member 86 is inserted. The rectangular portion 84 also has claw portions 84C on each of its front and rear end surfaces as engagement portions that engage with the head 66A of the left headrest holder 66.

[0061] 10, the locking member 86 is formed in the shape of an elongated rectangular parallelepiped, and grooves 86A are formed on both left and right end surfaces as engaging portions that engage with the rectangular portion 84. The locking member 86 is inserted into the insertion hole 84B with the left end portion 52C2 of the second stay member 52 inserted into the rectangular portion 84. As shown in FIG. 11, the locking member 86 fits into the slit 54 formed in the left end portion 52C2 of the second stay member 52.

[0062] The elastic member 88 is made up of a spring, and is attached to the outer periphery of a cylinder (not shown) that protrudes from the right end face of the rectangular portion 84.

[0063] The left end 52C2 of the second stay member 52 passes through a through-hole 84A in the rectangular portion 84 and is inserted into the head 66A of the left headrest holder 66. The portion where this left end 52C2 passes through the rectangular portion 84 has a gap between the left end 52C2 and the rectangular portion 84 that allows the pressing member 82 to move (advance and retreat), and the pressing member 82 is pressed into contact with the passed-through left end 52C2 by the biasing force of the elastic member 88. When the pressing member 82 is pressed into contact with the left end 52C2, the locking member 86 is biased toward the slit 54, as shown in FIG. 11 , and the second stay member 52 is locked by the locking member 86.

[0064] The pressing member 82, locking member 86, and elastic member 88 are housed in the mounting hole 66C of the head 66A of the left headrest holder 66, with only the operating portion 82A of the pressing member 82 protruding, and the lock can be released by pressing this operating portion 82A. That is, when the operating portion 82A is pressed, the rectangular portion 84 moves to the right and presses the elastic member 88 in the direction opposite to the biasing direction of the elastic member 88, i.e., to the right, and the locking member 86 comes out of the slit 54, thereby releasing the lock of the second stay member 52.

[0065] Although not shown in the figure, the left end portion 52C2 of the second stay member 52 has a plurality of slits 54 provided at predetermined intervals in the vertical direction, making it possible to lock the second stay member 52 at a desired height.

[0066] Bracket 70 has an upper edge at its upper end that extends in the vehicle width direction, and a lower edge at its lower end that has a vertical width that increases from right support member 60A to left support member 60B, and is provided with a fixing portion 72 to which headrest bushing 62 is fixed. Bracket 70 also has an upper surface portion 74 that extends rearward from its upper end, and a lower surface portion 76 that extends rearward from its lower end.

[0067] The upper surface portion 74 and the lower surface portion 76 are formed in a rectangular shape with a width in the vehicle front-to-rear direction that decreases from the right support member 60A toward the left support member 60B. The lower surface portion 76 is also formed with a mounting portion 78 that extends from the right end to the right and then downward, and a bracket (not shown) for fixing the bracket 70 to the upper frame 26A is attached to the mounting portion 78.

[0068] 7, the rear sides of the headrest bushings 62 of the right support member 60A and the left support member 60B are fixed to the front side surfaces of the fixing portions 72 of the bracket 70 by welding W. The upper frame 26A is then attached between the upper surface portion 74 and the lower surface portion 76 of the bracket 70, i.e., to the rear side surfaces of the fixing portions 72. The bracket 70 is fixed to the upper frame 26A by a bracket (not shown) attached to the attachment portion 78.

[0069] Furthermore, as shown in Fig. 8, a rear end 74A of the right end of the upper surface portion 74 of the bracket 70 is fixed to the upper frame 26A by welding W. As shown in Figs. 6 and 7, the position where the bracket 70 is attached is the left end of the upper frame 26A, and this left end is curved in an R-shape because it is the boundary with the left side frame 26D. Therefore, as shown in Fig. 8, a rear end 74B of the left end of the upper surface portion 74 of the bracket 70 does not abut against the upper frame 26A, and therefore is not welded. In other words, the bracket 70 is fixed to the upper frame 26A by a cantilever structure.

[0070] <Actions and Effects of This Embodiment> Next, the operation and effects of this embodiment will be described.

[0071] In the present embodiment, when the bracket 70 is fixed to the upper frame 26A by a cantilever structure, i.e., when the right support member 60A and the left support member 60B are fixed to the upper frame 26A by a cantilever structure, if luggage in the luggage compartment collides with the back of the seat back due to inertial force during sudden deceleration of the vehicle, the second stay member 52 may be twisted, and an angular difference may occur between the right end portion 52C1 and the left end portion 52C2.

[0072] 12 and 13 respectively show an enlarged perspective view and a front view of a main portion of a conventional stay member 152. As shown in Fig. 12 and 13, a slit 154 is formed in a left end 152C2 of both end portions 152C of the conventional stay member 152. As shown in Fig. 13, this slit 154 is cut out in one direction, and the cutout range is approximately 75°.

[0073] In the conventional slit 154 configured in this manner, for example, when the left end portion 152C2 is twisted and rotated, the locking member (not shown) fitted in the slit 154 may come out of the slit 154, causing the stay member 152 to become unlocked. To make it more difficult to unlock, it is conceivable to take measures such as adding a locking member, but this increases the number of parts, which increases costs and requires a new step in the assembly process when assembling the stay member 152. Furthermore, if a new step is added, a step is also required to check for omissions, etc., which complicates the assembly and quality check work.

[0074] In contrast to the conventional structure, the locking structure for the headrest stay of this embodiment is provided with a slit 54 formed in the left end 52C2 of the second stay member 52, cut along the outer circumferential surface on the side facing the right end 52C1, perpendicular to the axial direction of the left end 52C2. Therefore, even if the second stay member 52 is twisted and the left end 52C2 rotates during the above-mentioned collision, the locking member 86 can fit into the slit 54 formed along the outer circumferential surface, thereby preventing the second stay member 52 and the left support member 60B from being unlocked. This makes it possible to prevent the second stay member 52 from being unlocked without increasing the number of parts.

[0075] In addition, since the number of parts does not increase, costs can be reduced, and since no new steps are added to the assembly process when assembling the second stay member 52, the assembly and quality confirmation work can be prevented from becoming complicated.

[0076] For example, in the case of the rear seat 10 of a vehicle, when the vehicle suddenly decelerates, luggage in the luggage compartment may collide with the back of the seat back due to inertial force. For this reason, a test (luggage compartment partition strength test) has been established to evaluate safety against such luggage collisions. In such a luggage compartment partition strength test, it is desirable that the second stay member 52 does not become unlocked when, for example, a standard luggage of a predetermined mass collides with the back of the seat back due to inertial force during a collision.

[0077] In the case of a split rear seat 10 as in this embodiment, the rear seat 10 is split near the center seat 16B, so that in the above-described luggage compartment partition strength test, the front and rear deflections become large, which makes it easy for the second stay member 52 to twist. Therefore, in the above-described luggage compartment partition strength test, there was a high possibility that the lock of the stay member 152 would come off.

[0078] Therefore, as in the present embodiment, a second stay member 52 having a slit 54 cut along the outer peripheral surface of the left end 52C2 of the second stay member 52 on the side facing the right end 52C1, the slit 54 being perpendicular to the axial direction of the left end 52C2, was used, and the second stay member 52 did not come unlocked even in the above-mentioned luggage compartment partition strength test. Thus, according to the present embodiment, it was possible to prevent the second stay member 52 from coming unlocked without increasing the number of parts.

[0079] Furthermore, in the locking structure of the headrest stay of this embodiment, the slit 54 is cut out over a range of 120° around the axis of the left end portion 52C2. In other words, since the cutout range is 120°, it is possible to preferably maintain the strength of the second stay member 52 and prevent the second stay member 52 from becoming unlocked without increasing the number of parts.

[0080] Furthermore, the locking structure of the headrest stay of this embodiment includes an elastic member 88 that biases the locking member 86 toward the slit 54, and a pressing member 82 that presses the elastic member 88 in the direction opposite to the biasing direction. Therefore, the locking member 86 is pressed by the elastic member 88 while fitted into the slit 54, so that the locked state of the second stay member 52 can be maintained. Furthermore, by pressing the elastic member 88 in the direction opposite to the biasing direction with the pressing member 82, the locking member 86 can be removed from the slit 54, and the locked state of the second stay member 52 can be released.

[0081] Furthermore, in the headrest stay locking structure of the present embodiment, the slit 54 is formed in the second stay member 52 used for the center seat 16B located on the center side of the right seat back 16 that has seating for two in the split-type vehicle rear seat 10. Therefore, for example, when luggage in the luggage compartment collides with the back surface of the right seat back 16 due to inertial force during sudden deceleration of the vehicle, the slit 54 can be provided in the second stay member 52 located on the side of the upper frame 26A that is located at the boundary with the left side frame 26D and curved in an R shape, i.e., in the second stay member 52 that is likely to twist.

[0082] Moreover, the locking structure for the headrest stay of this embodiment further includes a bracket 70 to which the left support member 60B is fixed and which is fixed only on the right side in the vehicle width direction to the upper frame 26A, and the slit 54 is formed in the left end portion 52C2. That is, the bracket 70 has a cantilever structure with respect to the upper frame 26A, and the slit 54 is formed in the left end portion 52C2 which is located on the side that is not supported in the cantilever structure. Therefore, when the bracket 70, i.e., the support member 60, is fixed to the upper frame 26A by a cantilever structure, the slit 54 can be provided in the left end portion 52C2 which is most likely to twist.

[0083] (Supplementary explanation of the embodiment) In the above embodiment, the slit 54 formed in the left end portion 52C2 is formed within a range of 120° around the axis of the left end portion 52C2, but the present invention is not limited to this. A slit 54 formed within a range of 120° can most effectively prevent the second stay member 52 from being unlocked without increasing the number of parts while maintaining the strength of the second stay member 52. However, the slit 54 may be formed within a range of 100° to 140° or within a range of 110° to 130°. A range of 100° to 140° can also effectively prevent the second stay member 52 from being unlocked without increasing the number of parts while maintaining the strength of the second stay member 52. A range of 110° to 130° can even more effectively prevent the second stay member 52 from being unlocked without increasing the number of parts while maintaining the strength of the second stay member 52.

[0084] In the above embodiment, the slits 54 are formed so as to extend 60° forward and 60° backward from a plane including the axis of the right end 52C1 and the axis of the left end 52C2, but the present invention is not limited to this. For example, more notches may be formed in a direction more likely to twist.

[0085] Furthermore, in the above embodiment, the slit 54 is provided in the second stay member 52 of the center seat 16B of the right seat back 16, but the present invention is not limited to this. For example, if a center seat is provided on the left seat back 18, the bracket to which the two support members are fixed will be fixed only on the left side, so the same effect as in the above embodiment can be obtained by providing the slit in the right end of the stay member of the center seat of the left seat back 18.

[0086] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment may be appropriately combined with various modified examples, and the present invention may of course be embodied in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0087] 10 Rear seat (vehicle rear seat) 16 Right seat back (first seat back) 16B center seat 18 Left seat back (second seat back) 20 Headrest body 26 Right seat back frame (back frame) 52 second stay member (stay member) 52C end 52C1 Right end (other end) 52C2 Left end (one end) 54 Slit 60 Support member 60B Left side support member (support member) 70 Bracket 82 Pressing member 86 Locking member 88 Elastic member

Claims

1. a headrest body that supports the head of an occupant; a stay member formed by bending a pipe, the stay member supporting the headrest body and having both end portions inserted into a cylindrical support member attached to a back frame supporting the back of an occupant; a slit formed in at least one of the end portions on both end sides of the stay member, the slit being cut along an outer peripheral surface on a side facing the other end portion, the slit being perpendicular to the axial direction of the end portion; a locking member provided at a position corresponding to the slit of the support member and fitted into the slit; a bracket to which the support member is fixed and which is fixed to the back frame only on one side in the vehicle width direction; Equipped with The locking structure for a headrest stay, wherein the slit is formed at the end portion on the other side in the vehicle width direction.

2. a headrest body that supports the head of an occupant; a stay member formed by bending a pipe, the stay member supporting the headrest body and having both end portions inserted into a cylindrical support member attached to a back frame supporting the back of an occupant; a slit formed in at least one of the end portions on both end sides of the stay member, the slit being cut along an outer peripheral surface on a side facing the other end portion, the slit being perpendicular to the axial direction of the end portion; a locking member provided at a position corresponding to the slit of the support member and fitted into the slit; Equipped with the back frame is provided on the first seat back of a split-type vehicle rear seat having a first seat back with a seat for two people and a second seat back with a seat for one person, The stay member is provided on a center seat located on the center side of the first seat back, a bracket to which the support member is fixed, and only a side opposite to the first seat back in the vehicle width direction is fixed to the back frame; The locking structure of the headrest stay, in which the slit is formed at the end portion on the second seat back side.

3. the back frame is provided on the first seat back of a split-type vehicle rear seat having a first seat back with a seat for two people and a second seat back with a seat for one person, 2. The headrest stay lock structure according to claim 1, wherein the stay member is provided on a center seat located on the center side of the first seat back.

4. a bracket to which the support member is fixed, and only a side opposite to the first seat back in the vehicle width direction is fixed to the back frame; The headrest stay locking structure according to claim 3 , wherein the slit is formed in the end portion on the second seat back side.

5. The locking structure for a headrest stay according to any one of claims 1 to 4, wherein the slit is cut out in a range of 100° to 140° around the axis of one of the ends.

6. The locking structure for a headrest stay according to any one of claims 1 to 4, wherein the slit is cut out in a range of 110° to 130° around the axis of one of the ends.

7. The locking structure for a headrest stay according to any one of claims 1 to 4, wherein the slit is cut out over a range of 120° around the axis of one of the ends.

8. The locking structure for a headrest stay according to any one of claims 1 to 7, including: an elastic member that biases the locking member toward the slit; and a pressing member that presses the elastic member in a direction opposite to the biasing direction.

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