JP6544636B2 - Release prevention structure for vehicle seat - Google Patents

Description

  The present invention relates to an anti-separating structure for a vehicle seat, and more specifically, in a vehicle provided with a seat cushion that can be caused forward, the accidental release and jumping of the seat cushion when an excessive external force is applied to the vehicle Related to the structure to

  Conventionally, in a vehicle seat, the seat cushion is pivotably supported by the support frame at the front lower portion, and the seat cushion can be brought forward from the seating position, whereby the lower space of the seat cushion becomes an article storage space It is used for the installation space of a portable storage container, etc. (for example, refer to patent documents 1).

  In such a vehicle seat, in the seating position, the seat cushion is locked in the seating position by a lock mechanism including a latch provided on the rear lower surface of the seat cushion and a striker fixed to the support frame. The latch can be engaged with the striker by being retractably accommodated in the latch case and biased in the projecting direction, while the lock is released by pulling the latch against the biasing force and the seat cushion causes It becomes possible.

  Furthermore, such a vehicle seat includes a pair of projections erected at the rear of the support frame adjacent to the lock mechanism, and a pair of engagements drilled at the rear of the cushion frame to engage them. It has a position control means consisting of a hole. The position restricting means restricts the movement of the seat cushion in the vehicle width direction accompanying the vibration when the vehicle is traveling, so the input load to the lock mechanism is reduced, and the lock mechanism itself can be small. .

  Since the position of the seat cushion in the vehicle width direction along with the raising operation is constant, the seat cushion can sufficiently perform position regulation by the position regulation means in the vehicle width direction, but it rotates in the vehicle longitudinal direction. In order to allow for the displacement in the front-rear direction associated with the above, it is necessary to provide a proper play between the engagement hole and the projection. In particular, when the pivot point of the seat cushion is at the lower end of the arm extended downward from the cushion frame, the rear part of the seat cushion is raised forward and upward, so the upward protrusion of the vehicle interior is reduced. The displacement becomes noticeable.

Patent No. 4241278

  The vehicle seat configured as described above has sufficient stability against vibration and occupant behavior associated with normal vehicle travel. However, when an excessive impact load is input from the front due to a frontal collision of the vehicle or the like, an inertial force acting on the seat cushion generates a force to move the seat cushion forward, and such force causes the seat cushion to move. The possibility of unlocking was investigated by the following mechanism.

  That is, although the inertial force acting on the seat cushion is transmitted to the engagement position of the latch and the striker, the attachment point of the latch mechanism to the cushion frame is located above the engagement position of the latch and the striker (Offset) causes the latch mechanism to tilt about its attachment point and to try to pull away from the cushion frame and / or to create a moment force that tends to deform the attachment point of the cushion frame Possibly, this moment force raised the rear part of the cushion frame and considered the possibility of unlocking the rear part of the cushion frame before the latch broke.

  Such problems can be solved by increasing the strength of the latch mechanism and the cushion frame. However, in this case, the weight increases and the available space on the lower side of the seat cushion decreases as the latch mechanism is enlarged. In addition, it is preferable from the viewpoint of product balance and manufacturing cost to equip parts for over specs (overperformance) with respect to securing of stability against vibration and behavior of occupants accompanying normal vehicle traveling in case of emergency. Absent.

  The present invention has been made in view of such circumstances, and an object thereof is to prevent the unlocking and jumping up of the seat cushion due to the excessive load input in an emergency without causing the enlargement of the parts and the weight increase. An object of the present invention is to provide an anti-separating structure for a vehicle seat that can be carried out.

In order to solve the above-mentioned subject, the detachment prevention structure of the vehicular seat concerning the present invention is:
A seat cushion (2) comprising a cushion body (21) and a cushion frame (22);
A hinge arm (23) extending downward from the front of the cushion frame;
A support frame (4) on which the lower end (23a) of the hinge arm is pivotally supported and the cushion frame (22) is supported at the seating position of the seat cushion so that the seat cushion can be raised forward. )When,
A pair of brackets (47, 47) erected at the rear of the support frame, and a pair of engagements drilled in the rear lower surface of the cushion frame to engage with the pair of brackets at the seating position of the seat cushion. Horizontal position control means comprising an opening (60, 60);
A striker (46) extended between the pair of brackets, and a latch (64) movably attached to the rear lower surface of the cushion frame so as to be engageable and disengageably engaged with the striker at the seating position of the seat cushion. Lock mechanism (6), and
In a vehicle seat provided with
A hook (48) having a downward locking surface (48a) is formed by notching the edge portion on the rear side in the vehicle longitudinal direction of the pair of brackets, and the locking surface is the pair of the pair at the seating position of the seat cushion. In the state where the engagement hole (60) is engaged with the pair of brackets (47), which is at a higher position than the peripheral edge (67) of the pair of engagement holes and of the locking surface (48a) A gap (48c) larger than the thickness of the peripheral edge (67) is defined on the lower side.

The vehicle seat detachment prevention structure according to the present invention is configured as described above, and thus has the effects described below.
(I) A hook is formed by cutting out a bracket for restricting the horizontal position at the rear of the cushion frame, and a clearance is defined below the locking surface to which the peripheral edge of the engagement hole at the rear of the cushion frame can enter. Since an excessive impact load is input to the seat cushion from the front due to a frontal collision of the vehicle and the like, when moved forward by the inertia force, the periphery of the engagement hole is locked to the hook's locking surface, It is possible to prevent the unlocking of the seat cushion and the accompanying bounce of the rear of the seat cushion.
(Ii) The hook is formed in the design cross section of the bracket that regulates the horizontal position at the rear of the cushion frame, so it is not necessary to increase the size or addition of parts such as a latch mechanism. There is no increase in weight and cost, no deterioration in operability when the seat cushion is created, and no decrease in the available space under the seat cushion.

  In a preferable aspect of the present invention, since the inclined edge (48b) inclined to the vehicle front side with respect to the standing direction of the pair of brackets is provided on the lower side of the locking surface, Accordingly, when an excessive impact load is input to the seat cushion from the front and moved forward by the inertia force, the peripheral edge of the engagement hole is guided by the inclined edge so that the hook's locking surface can be reliably secured. It is locked, and the unlocking of the seat cushion and the subsequent bounce of the seat cushion can be reliably prevented. In addition, there is an advantage that the necessary clearance for locking is minimized, and the processing on the bracket is also minimized.

  In a preferred aspect of the present invention, the pair of brackets (47) has a flange (47b) protruding in the vehicle width direction at the peripheral edge of a plate-like main body (47a) oriented in the vehicle longitudinal direction, The hooking surface (48a) of the hook (48) is formed as an upper edge of a U-shaped notch (48d) cut out of the flange (47b) and indented toward the front of the vehicle. The locking surface is enlarged in an L shape including a notch to the flange, which is advantageous in securing the locking force of the hook, and by locking by the tip of the flange or biting into the U-shaped notch, It can also be expected to prevent detachment due to reaction at the time of locking.

  In a preferred aspect of the present invention, the support frame (4) comprises a pair of side frames (41, 41) disposed on both sides, and a front and rear cross frame (42, 44) is formed into a rectangular frame shape, and the pair of brackets (47) is a rear cross frame made of a round pipe at a joint edge (47c) obtained by cutting the plate-like main body (47a) in an arc shape. The lower end (47d) of the pair of brackets extends to the lower end of the rear cross frame (44), so that the rear cross is not enlarged. It is advantageous in securing the welding length with the frame, improving the rigidity of the joint portion between the bracket and the rear cross frame, and the load bearing performance of the seat cushion's detachment prevention function.

(A) is a perspective view which shows the vehicle seat provided with the detachment prevention structure which concerns on embodiment of this invention, (b) is the principal part enlarged view. It is a perspective view which shows the state which caused the seat cushion. It is a side view which shows the state which caused the seat cushion. It is a partially broken side view which shows the seating position of a seat cushion. It is a perspective view showing the support frame of the vehicular seat provided with the detachment prevention structure concerning the embodiment of the present invention. It is a bottom view showing the back of a seat cushion. It is sectional drawing (AA sectional drawing of FIG. 6) which shows the vehicle seat provided with the detachment prevention structure which concerns on this invention embodiment. (A) is sectional drawing (BB sectional drawing of FIG. 6) which shows lock release and raising operation of a vehicle seat provided with the detachment prevention structure which concerns on this invention embodiment, (b) is the same sheet. It is sectional drawing (BB sectional drawing of FIG. 6) which shows the behavior at the time of the inertial force accompanying the excessive external force from the front acting.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In FIGS. 1 to 4, a vehicle seat 1 includes a seat cushion 2 and a seat back 3. The seat back 3 includes a seat back main body 31 formed by covering the surface of a foam molded article such as urethane foam with a skin material, and a seat back frame 32 made of metal, and a spring is provided on the seat back frame 32. ing. The seat back 3 is attached to the rear of the support frame 4 at a lower end portion of the seat back frame 32 via a hinge portion 33 provided with a reclining mechanism, and can be laid forward and tiltable rearward.

  The seat cushion 2 includes a cushion main body 21 formed by covering the surface of a foam-formed article such as urethane foam with a skin material, and a cushion frame 22 formed by press-forming a metal plate. The cushion frame 22 is formed in a shallow butt shape so as to be able to accommodate the lower portion of the cushion main body 21 and support it from below. The bottom portion 20 of the cushion frame 22 is not uniform in depth and is formed deeper toward the rear, and is designed to allow the user to be seated stably by the cushion body 21 having the same inclination.

  A pair of left and right hinge arms 23 extend downward from the front of the cushion frame 22. As shown in FIG. 5, the hinge arm 23 is fixed to the bottom surface of the cushion frame 22 with a bolt (not shown) in a bolt hole 23b bored at the upper end, and is a bolt 23a serving as a pivot at the lower end. It is pivotally supported by the support frame 4 (side frame 41), and is caused to move forward as shown by solid lines in FIGS. 2 and 3 from the seating position shown by dashed double-dotted lines in FIGS. It is possible.

  The support frame 4 is a plane from the front cross frame 42 and the two rear cross frames 43 and 44 that rigidly couple the left and right side frames 41 and 41 disposed on the lower side of the both sides of the seat cushion 2 with each other. It is formed in the shape of a rectangular frame when viewed, and a storage space 40 of the storage container 7 described later is defined at the center thereof. The left and right side frames 41 are made of a press-formed product using a metal plate, and the three cross frames 42, 43 and 44 are made of lightweight and high-strength metal round pipes.

  Upper rails 51, 51 constituting a pair of left and right slide rails 5, 5 are fixed to lower portions of the left and right side frames 41, 41, and lower rails 52, 52 slidably support the upper rails 51, 51 It is being fixed to the unillustrated vehicle body floor. The lower rail 52 is provided with a rack for position fixing, and a slide lock mechanism (not shown) which can be engaged with and detached from the rack is provided on the upper rail 51 side, and the bar 45 releases the slide lock mechanism. The seat 1 can be fixed at any position on the slide rail 5.

  As shown in FIGS. 2 to 4, the storage container 7 has a rectangular bucket shape and is made of a resin molded product, and a flange is integrally molded around the upper edge opening and folded inward. It has a handle 71 of the formula. The storage container 7 is supported by the support frame 4 by mounting the flanges extending forward and backward to the front cross frame 42 and the rear cross frame 44 of the support frame 4, and the lower side of the seat cushion 2 Being housed in the housing space 40 and causing the seat cushion 2 to be forward, as shown in FIGS. 2 and 3, the storage container 7 can be accessed, and in FIG. 3, a two-dot chain line (7 ′) As shown, it can be removed externally. In addition, a notch 70 is provided at the center of the rear flange, which is at a lower position than the other edges, to avoid the horizontal position control means (47, 60) and the lock mechanism (6, 46) described later. .

  The rear portion of the seat cushion 2 is supported on the rear cross frame 44 of the support frame 4 in the seating position with its position in the vehicle width direction regulated by the horizontal position regulating means (47, 60), and a locking mechanism It is locked in the sitting position by (6, 46).

  As the support structure (25, 44) at the rear of the seat cushion, as shown in FIGS. 3 and 6, stopper rubbers 25 are provided at the left and right two places on the rear lower surface of the cushion frame 22. However, the storage container 7 is fixed by being placed on the rear cross frame 44 while sandwiching the rear flange of the storage container 7 via the stopper rubber 25, and the rear of the seat cushion 2 is Be supported.

  The horizontal position restricting means (47, 60) at the rear of the seat cushion, as shown in FIG. 5, are a pair of brackets 47, 47 erected near the center of the rear cross frame 44, as shown in FIGS. A pair of engagement holes 60, 60 are provided in the lower rear surface of the cushion frame 22 to engage the brackets 47, 47 at the seating position of the seat cushion.

  The bracket 47 is a press-formed product of a metal plate, and as shown in FIG. 7, has a flange 47b projecting in the vehicle width direction on the peripheral edge of a plate-like main body 47a oriented in the vehicle longitudinal direction. The lower end portion 47 d reaches the lower end of the rear cross frame 44, which is welded and fixed to the rear side of the rear cross frame 44 at a junction edge 47 c which is notched in an arc shape.

  As shown in FIGS. 1 (b) and 6, the engagement holes 60, 60 correspond to the cross-sectional shape of the bracket 47, and are in the shape of an elongated hole or a slit extending in the vehicle width direction. The base plate 62 of the mechanism 6 is vertically penetrated and drilled, and a projecting edge 67 is formed on the peripheral edge portion of the engagement holes 60, 60. The base plate 62 is attached to the mounting surface 24 recessed from the lower surface side at the center of the rear of the cushion frame 22 with screws 68 and 68, and the flange 67 passes through an opening 27 provided in the mounting surface 24.

  The lock mechanism (6, 46) at the rear of the seat cushion can be engaged and disengaged with the striker 46 provided between the pair of brackets 47, 47 described above and the seat cushion seating position as shown in FIG. And a latch mechanism 6 having a latch 64 engaged with the

  As shown in FIGS. 6 and 7, the latch mechanism 6 is accommodated in a latch case 61 integrally formed with the base plate 62 so as to be able to advance and retract, and has a latch 64 having an inclined surface (cam surface) at its tip, A retainer 63 extends in the advancing and retracting direction of the latch 64 and has a tip end supported by the retainer 63 and is interposed between the back surface of the latch case 61 and the rear surface of the latch 64. A spring 65 for biasing the latch 64 in the projecting direction and a strip-like release operating member 66 connected to the rear end of the latch 64 are provided.

  When the seat cushion 2 is to be unlocked, the release operation member 66 is pulled to retract the latch 64 against the biasing force of the spring 65 into the latch case 61 so that the seat cushion 2 can be detached from the striker 46. The cushion 2 can be triggered. When the induced seat cushion 2 is returned to the seating position, the inclined surface of the tip of the latch 64 is guided by the striker 46 so that the latch 64 retracts against the biasing force of the spring 65 and the striker 46 The seat cushion 46 is engaged and the seat cushion rear portion is locked to the support frame 4 by projecting again by the bias of the spring 65 after passing through.

  The latch case 61 of the latch mechanism 6 configured as described above, the base plate 62 including the peripheral portion 67 of the engagement hole 60, and the retainer 63 are integrally molded as a resin molded product, and the latch 64 is also a resin molded product Thus, the weight reduction is achieved, and the sliding contact portion of the peripheral portion 67 and the latch 64 has low friction, and there is an advantage that the raising of the seat cushion 2 and the returning operation to the sitting position are made quiet. As described above, the horizontal position of the rear part of the seat cushion is regulated by the bracket 47, and the latch mechanism 6 is only a resin molded product for normal use since it is only anchored so that the rear part of the seat cushion does not lift up. Sufficient stability can be obtained

  On the other hand, when an excessive impact load is input from the front due to a frontal collision of the vehicle, etc., if the force to move the seat cushion 2 forward is generated by the inertia force acting on the seat cushion 2, the latch It has already been mentioned that there may be a moment force which tends to pull the mechanism 6 away from the cushion frame 22 by tilting the mechanism 6 counterclockwise in FIG. 7 about its attachment point (68). Therefore, in order to cope with such an emergency behavior, the vehicle seat according to the present invention is provided with the detachment prevention structure as described below.

  That is, as shown in FIGS. 7 and 8, a hook 48 is formed by cutting the rear end of the bracket 47 in the vehicle longitudinal direction and having a downward locking surface 48a. The hooking surface 48a of the hook 48 is formed substantially horizontally as an upper edge of a U-shaped notch 48d which cuts off the flange 47b of the bracket 47 and indents toward the front of the vehicle, and is shown in FIG. As described above, an inclined edge 48 b inclined to the vehicle front side with respect to the standing direction of the bracket 47 is formed below the notch 48 d. Furthermore, in a state where the engagement hole 60 is engaged with the bracket 47 at the seating position of the seat cushion 2, the locking surface 48a is at a higher position than the peripheral edge 67 of the engagement hole 60 and of the locking surface 48a. A gap 48c larger than the thickness of the peripheral portion 67 is defined on the lower side.

  The vehicle seat 1 having the detachment prevention structure as described above has the peripheral portion 67 of the engagement hole 60 even when the seat cushion 2 is moved forward by the inertia force accompanying the excessive impact load input from the front. Is locked to the locking surface 48a of the hook 48, so that detachment and bounce of the seat cushion rear portion is prevented.

  At that time, the peripheral edge 67 of the engagement hole 60 is guided by the inclined edge 48c, so that the locking surface 48a of the hook 48 is reliably locked, and the locking surface 48a includes a notch for the flange 47b. The L configuration in a plan view is advantageous in securing the locking force of the hook 48, and by hooking with the tip of the flange or biting into the U-shaped notch 48d. It can also be expected to prevent detachment due to reaction at the time of locking.

  Further, since the hook 48 is formed in the design cross section of the bracket 47, the enlargement of the latch mechanism 6 and the addition of parts are unnecessary, and the weight increase and cost increase accompanying it, the operability at the time of causing the seat cushion It does not cause deterioration or decrease in available space under the seat cushion.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, Based on the technical thought of this invention, various deformation | transformation and changes are possible.

1 Vehicle Seat 2 Seat Cushion 3 Seat Back 4 Support Frame 5 Slide Rail 6 Latch Mechanism (Lock Mechanism)
7 Storage container 21 Cushion main body 22 Cushion frame 23 Hinge arm 24 Mounting surface 25 Stopper rubber 27 Opening 41 Side frame 42 Front cross frame 43, 44 Rear cross frame 46 Striker (lock mechanism)
47 Bracket (horizontal position control means)
47a plate-like main body 47b flange 47c joining edge 48 hook 48a locking surface 48b inclined edge 48c gap 48d U-shaped notch 60 engagement hole (horizontal position restricting means)
61 latch case 62 base plate 63 retainer 64 latch 65 spring 66 release operating member

Claims (4)

A seat cushion consisting of a cushion body and a cushion frame;
A hinge arm extending downward from the front of the cushion frame;
A support frame on which the lower end of the hinge arm is pivoted so that the seat cushion can be brought forward, and on which the cushion frame is supported in the seated position of the seat cushion;
It consists of a pair of brackets erected at the rear of the support frame, and a pair of engagement holes drilled in the rear lower surface of the cushion frame to engage with the pair of brackets at the seating position of the seat cushion. Horizontal position control means,
A lock mechanism comprising a striker provided between the pair of brackets and a latch provided on the lower surface of the rear portion of the cushion frame so as to be engageable and disengageable with the striker at the seating position of the seat cushion. When,
In a vehicle seat provided with
A hook is formed by cutting a rear edge of the pair of brackets in the longitudinal direction of the vehicle to form a hook having a downward locking surface, and the locking surface corresponds to the pair of engagement holes at the seating position of the seat cushion. A gap larger than the thickness of the peripheral edge is defined on the lower side of the locking surface at a position higher than the peripheral edge of the pair of engagement holes in a state engaged with the pair of brackets. Release prevention structure of the vehicle seat characterized by.   The vehicle seat detachment preventing structure according to claim 1, further comprising an inclined edge portion which is inclined to the vehicle front side with respect to the standing direction of the pair of brackets below the locking surface.   The pair of brackets has a flange protruding in the vehicle width direction at a peripheral portion of a plate-like main body oriented in the vehicle longitudinal direction, and the locking surface of the hook cuts out the flange to front the vehicle The vehicle seat disengagement preventing structure according to claim 2, wherein the vehicle seat is formed as an upper edge of a U-shaped notch which is recessed toward the side.   The support frame is formed in a rectangular frame shape from a pair of side frames disposed on both sides and a front and rear cross frame rigidly connecting them to each other, and the pair of brackets are in the plate shape. The welding is fixed to the rear side of the rear cross frame made of a round pipe at a joint edge where the main body is cut into an arc, and the lower ends of the pair of brackets extend to the lower end of the rear cross frame. The vehicle seat separation prevention structure according to claim 3, characterized in that

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