JP2017043123A - Vehicular seat separation preventing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lock-releasing and jumping-up of a seat cushion due to an excessive load input in an emergency without introducing component enlargement and weight increase.SOLUTION: In a vehicular seat comprising a support frame by that the lower end of a hinge arm is supported pivotally so that a seat cushion can be pulled up to the front side and a cushion frame 22 is supported at a seating position, a bracket 47 stood at the rear part, horizontal position regulating means constituted by an engagement hole 60 drilled in the cushion frame so as to be engaged with the bracket at the seating position, a striker 46 mounted as bridging over the bracket, and a lock mechanism 6 constituted by a latch 64 engaging with the striker at the seating position, formed is a hook 48 which notches the edge part at the vehicular longitudinal direction rear side of the bracket and has a downward-facing engagement surface 48a, the engagement surface is at the position higher than the periphery part 67 of the engagement hole under a condition that the engagement hole is engaged with the bracket, and a gap 48c larger than the thickness of the periphery part is defined below the engagement surface.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a structure for preventing a vehicle seat from being detached, and more particularly, in a vehicle having a seat cushion that can be moved forward, preventing the seat cushion from being unexpectedly detached and jumped up when an excessive external force is applied to the vehicle. It is related to the structure to do.

  2. Description of the Related Art Conventionally, in a vehicle seat, the seat cushion is pivotally supported by a support frame at a front lower portion so that the seat cushion can be moved forward from a seating position, so that a lower space of the seat cushion is stored as an article storage space. It is used for installation space of portable storage containers and the like (see, for example, Patent Document 1).

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

  Further, such a vehicle seat includes a pair of protrusions standing at the rear part of the support frame adjacent to the lock mechanism and a pair of engagements formed at the rear part of the cushion frame so as to engage with them. Position restricting means comprising a hole is provided. Since the position restricting means restricts the movement of the seat cushion in the vehicle width direction due to vibration during vehicle travel, the input load to the lock mechanism is reduced, and the lock mechanism itself can be small. .

  The position of the seat cushion in the vehicle width direction accompanying the raising operation is constant, so that the position restriction by the position restriction means can be sufficiently performed in the vehicle width direction. Therefore, it is necessary to allow a certain amount of play between the engagement hole and the protrusion so as to allow the displacement in the front-rear direction accompanying the above. In particular, when the pivot point of the seat cushion is at the lower end of the arm that extends downward from the cushion frame, the rear portion of the seat cushion is raised frontward and upward, so that the upward projection in the vehicle interior is reduced, The displacement becomes significant.

Japanese Patent No. 4241278

  The vehicle seat configured as described above has sufficient stability against vibrations 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, etc., a force to move the seat cushion forward is generated by the inertial force acting on the seat cushion. The possibility of unlocking by the following mechanism was examined.

  That is, the inertial force acting on the seat cushion is transmitted to the engagement position between the latch and the striker, but the attachment point of the latch mechanism with respect to the cushion frame is located above the engagement position between the latch and the striker. (Offset) causes the latch mechanism to tilt about its attachment point and cause a moment force to try to pull it away from the cushion frame and / or to deform the attachment point of the cushion frame The possibility that this moment force lifted the rear part of the cushion frame and examined the possibility that the rear part of the cushion frame could be unlocked before the latch broke.

  Such a problem can be solved by increasing the strength of the latch mechanism and the cushion frame. However, in this case, the weight is increased and the available space under the seat cushion is reduced as the latch mechanism becomes larger. Also, from the standpoint of product balance and manufacturing cost, it is preferable to equip parts that have overspecs (excess performance) for ensuring stability against vibrations and passenger behavior associated with normal vehicle travel. Absent.

  The present invention has been made in view of such a situation, and its purpose is to prevent unlocking and jumping of the seat cushion due to an excessive load input in an emergency without causing an increase in size and weight of parts. Another object of the present invention is to provide a structure for preventing a vehicle seat from being detached.

In order to solve the above problems, a structure for preventing the separation of a vehicle seat according to the present invention is as follows.
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 so that the seat cushion can be raised forward, and the cushion frame (22) is supported at the seating position of the seat cushion. )When,
A pair of brackets (47, 47) erected on the rear portion of the support frame, and a pair of engagement holes drilled on the lower surface of the rear portion of the cushion frame to engage with the pair of brackets at the seat cushion seating position. A horizontal position regulating means comprising a joint hole (60, 60);
A striker (46) provided between the pair of brackets, and a latch (64) provided on the lower surface of the rear portion of the cushion frame so as to be detachably engaged with the striker at a seating position of the seat cushion. A locking mechanism (6) comprising:
In a vehicle seat provided with
A hook (48) having a downward locking surface (48a) is formed by notching a rear edge portion of the pair of brackets in the vehicle front-rear direction, and the locking surface is located at the seat cushion seating position. In a state where the engagement holes (60) are engaged with the pair of brackets (47), the engagement holes (60) are positioned higher than the peripheral portions (67) of the pair of engagement holes, and the engagement surfaces (48a) A gap (48c) larger than the thickness of the peripheral edge portion (67) is defined on the lower side.

Since the structure for preventing the separation of the vehicle seat according to the present invention is configured as described above, it has the following effects.
(I) A hook is formed by notching a bracket that regulates the horizontal position of the rear portion of the cushion frame, and a gap is defined below the locking surface so that the peripheral portion of the engagement hole at the rear portion of the cushion frame can enter. Therefore, an excessive impact load is input to the seat cushion from the front due to the frontal collision of the vehicle, etc., and when the inertial force moves forward, the periphery of the engagement hole is locked to the locking surface of the hook, It is possible to prevent the seat cushion from being unlocked and the rear portion of the seat cushion from jumping up.
(Ii) Since the hook is formed in the design cross section of the bracket that regulates the horizontal position of the rear portion of the cushion frame, it is not necessary to increase or add parts such as a latch mechanism. There is no increase in weight, cost, deterioration in operability when causing the seat cushion, and reduction in available space under the seat cushion.

  In a preferred aspect of the present invention, since the inclined edge portion (48b) is inclined to the front side of the vehicle with respect to the standing direction of the pair of brackets on the lower side of the engaging surface, As a result, when an excessive impact load is input to the seat cushion from the front and moved forward by inertial force, the peripheral edge of the engagement hole is guided by the inclined edge, so that the hook locking surface can be reliably secured. It is locked and it is possible to surely prevent the seat cushion from being unlocked and the rear part of the seat cushion jumping up. In addition, there is an advantage that a gap necessary for locking is minimized and processing on the bracket is minimized.

  In a preferred aspect of the present invention, the pair of brackets (47) have a flange (47b) projecting in the vehicle width direction on the peripheral edge of the 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 cutout (48d) that cuts out the flange (47b) and enters the vehicle front side. The locking surface is enlarged to an L shape including a notch with respect 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 a reaction at the time of locking.

  In a preferred aspect of the present invention, the support frame (4) includes a pair of side frames (41, 41) disposed on both sides, and a front and rear cross frame (42, 41) that rigidly couple them together. 44), and the pair of brackets (47) is formed by a round cross pipe rear cross frame at a joint edge (47c) in which the plate-like body (47a) is cut out in an arc shape. (44) Since the lower end (47d) of the pair of brackets extends up to the lower end of the rear cross frame (44), the rear cross is secured without increasing the size of the bracket. The weld length with the frame can be secured, which is advantageous in improving the rigidity of the joint portion between the bracket and the rear cross frame and improving the load bearing performance of the seat cushion detachment preventing function.

(A) is a perspective view which shows the vehicle seat provided with the detachment | leave prevention structure which concerns on this invention embodiment, (b) is the principal part enlarged view. It is a perspective view which shows the state which raised the seat cushion. It is a side view which shows the state which raised the seat cushion. It is the side view which fractured | ruptured partially which shows the seating position of a seat cushion. It is a perspective view which shows the support frame of the vehicle seat provided with the separation | leave prevention structure which concerns on this invention embodiment. It is a bottom view which shows the rear part of a seat cushion. It is sectional drawing (AA sectional drawing of FIG. 6) which shows the vehicle seat provided with the detachment | leave prevention structure which concerns on this invention embodiment. (A) is sectional drawing (BB sectional drawing of FIG. 6) which shows unlocking | unlocking and raising operation | movement of the vehicle seat provided with the detachment prevention structure based on this invention embodiment, (b) is the same sheet | seat. It is sectional drawing (BB sectional drawing of FIG. 6) which shows the behavior when the inertia force accompanying the excessive external force from the front acts.

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

  The seat cushion 2 includes a cushion main body 21 formed by covering the surface of a foam molded product such as urethane foam with a skin material, and a cushion frame 22 formed by press-molding a metal plate. The cushion frame 22 is formed in a shallow bat shape so that the lower part of the cushion body 21 can be accommodated and supported from below. The bottom 20 of the cushion frame 22 is not uniform in depth but is formed deeper toward the rear, and is designed so that a user can be seated stably by a cushion body 21 having a similar inclination.

  A pair of left and right hinge arms 23 extend downward from the front portion of the cushion frame 22. As shown in FIG. 5, the hinge arm 23 is secured to the front bottom surface of the cushion frame 22 with a bolt (not shown) in a bolt hole 23 b drilled in the upper end portion, and is a bolt 23 a serving as a rotation shaft at the lower end portion. It is pivotally supported by the support frame 4 (side frame 41), and is caused to move forward from the seating position indicated by the two-dot chain line in FIGS. 1 and 3 as indicated by the solid line in FIGS. It is possible.

  The support frame 4 is formed from a pair of left and right side frames 41 and 41 disposed below the both sides of the seat cushion 2 and a front cross frame 42 and two rear cross frames 43 and 44 that rigidly couple them. It is formed in a frame shape that forms a quadrangle when viewed, and a storage space 40 of a storage container 7 described later is defined in 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 a light and high-strength metal round pipe.

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

  As shown in FIGS. 2 to 4, the storage container 7 has a rectangular bucket shape and is formed of a resin molded product. A flange is integrally formed around the opening of the upper edge and is folded inward. A handle 71 of the type is provided. The storage container 7 is supported by the support frame 4 by placing the flanges extending forward and rearward on the front cross frame 42 and the rear cross frame 44 of the support frame 4. As shown in FIG. 2 and FIG. 3, the storage container 7 can be accessed by moving the seat cushion 2 forward and stored in the storage space 40, and in FIG. 3 by a two-dot chain line (7 ′). As shown, it can be taken out to the outside. In addition, a notch 70 is provided in the center of the rear flange located at a lower position than the other edges to avoid horizontal position restricting means (47, 60) and a 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 a state where the position in the vehicle width direction is regulated by the horizontal position regulating means (47, 60) at the seating position, and the locking mechanism. (6, 46) to lock the seating position.

  As shown in FIGS. 3 and 6, the seat cushion rear portion support structure (25, 44) is provided with two stopper rubbers 25 on the lower surface of the rear portion of the cushion frame 22, and the seat cushion rear portion at the seating position. However, the storage container 7 is fixed and the rear part of the seat cushion 2 is fixed by being placed on the rear cross frame 44 with the rear flange of the storage container 7 sandwiched between the stopper rubber 25. Supported.

  As shown in FIG. 5, the horizontal position regulating means (47, 60) at the rear portion of the seat cushion includes a pair of brackets 47, 47 erected near the center of the rear cross frame 44, as shown in FIGS. In addition, the seat cushion includes a pair of engagement holes 60 and 60 formed in the lower surface of the rear portion of the cushion frame 22 so as to be engaged with the brackets 47 and 47 at the seat cushion seating position.

  The bracket 47 is made of a metal plate press-molded product, and as shown in FIG. 7, has a flange 47b projecting in the vehicle width direction on the periphery of the plate-like main body 47a oriented in the vehicle front-rear direction. It is welded and fixed to the rear side of the rear cross frame 44 at a joint edge 47 c cut out in an arc shape, and the lower end portion 47 d reaches the lower end of the rear cross frame 44.

  As shown in FIGS. 1B and 6, the engagement holes 60, 60 have a long hole shape or slit shape extending in the vehicle width direction corresponding to the cross-sectional shape of the bracket 47, and will be described later. The base plate 62 of the mechanism 6 is vertically penetrated and a protruding edge 67 is formed at the peripheral edge of the engagement holes 60, 60. The base plate 62 is attached to the mounting surface 24 that is recessed from the lower surface side at the center of the rear portion of the cushion frame 22 with screws 68, 68, and the projecting edge 67 passes through the opening 27 provided in the mounting surface 24.

  As shown in FIG. 5, the lock mechanism (6, 46) at the rear part of the seat cushion can be engaged with and disengaged from the striker 46 provided between the pair of brackets 47 and 47 and the striker 46 at the seat cushion seating position. It is comprised from the latch mechanism 6 provided with the latch 64 engaged with.

  As shown in FIGS. 6 and 7, the latch mechanism 6 is accommodated in a latch case 61 formed integrally with the base plate 62 so as to be able to advance and retract, and has a slope 64 (cam surface) at the tip, and a latch case A retainer 63 that extends in the advancing and retreating direction of the latch 64 and has a tip penetrating the latch 64 is supported inside the 61, and is interposed between the back surface of the latch case 61 and the back surface of the latch 64. And a spring 65 that biases the latch 64 in the protruding direction, and a strip-shaped release operation member 66 connected to the rear end of the latch 64.

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

  The latch case 61 of the latch mechanism 6 configured as described above, the base plate 62 including the peripheral edge 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 seat cushion 2 is raised and the returning operation to the seating position is quieted. As described above, the horizontal position of the rear portion of the seat cushion is regulated by the bracket 47, and the latch mechanism 6 is only moored so that the rear portion of the seat cushion does not float up. Enough stability

  On the other hand, when an excessive impact load is input from the front due to a frontal collision of the vehicle or the like, if a force to move the seat cushion 2 forward is generated by the inertial force acting on the seat cushion 2, the latch It has already been described that the mechanism 6 may be tilted counterclockwise in FIG. 7 around its attachment point (68), and a moment force to be peeled off from the cushion frame 22 may be caused. Therefore, in order to prepare for such an emergency behavior, the vehicle seat according to the present invention has a detachment prevention structure as described below.

  That is, as shown in FIGS. 7 and 8, a hook 48 having a downward locking surface 48a is formed by cutting out the rear edge of the bracket 47 in the vehicle longitudinal direction. The locking surface 48a of the hook 48 is formed substantially horizontally as an upper edge of a U-shaped cutout portion 48d that cuts out the flange 47b of the bracket 47 and enters the vehicle front side, as shown in FIG. As described above, an inclined edge portion 48b that is inclined toward the vehicle front side with respect to the standing direction of the bracket 47 is formed below the notch portion 48d. Further, 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 48 a is higher than the peripheral edge 67 of the engagement hole 60, and the locking surface 48 a A gap 48c larger than the thickness of the peripheral edge 67 is defined on the lower side.

  The vehicular seat 1 having the above-described detachment preventing structure has a peripheral edge 67 of the engagement hole 60 even when the seat cushion 2 moves forward due to an inertial force accompanying an excessive impact load input from the front. Is locked to the locking surface 48a of the hook 48, so that the rear part of the seat cushion and the jumping up are prevented.

  At that time, the peripheral edge 67 of the engagement hole 60 is guided by the inclined edge portion 48c, so that the engagement surface 48a is securely engaged with the engagement surface 48a of the hook 48, and the engagement surface 48a includes a notch with respect to the flange 47b. With the configuration expanded in an L shape in a plan view, it 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 a reaction at the time of locking.

  In addition, since the hook 48 is formed in the design cross section of the bracket 47, it is not necessary to increase the size of the latch mechanism 6 or to add parts, resulting in an increase in weight and cost associated with it, and operability when causing a seat cushion. There is no deterioration and no reduction in the 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, Various deformation | transformation and a change are possible based on the technical idea of this invention.

DESCRIPTION OF SYMBOLS 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 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 Strike (lock mechanism)
47 Bracket (Horizontal position restricting means)
47a Plate-shaped body 47b Flange 47c Joint 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 operation member

Claims (4)

A seat cushion comprising a cushion body and a cushion frame;
A hinge arm extending downward from the front portion of the cushion frame;
A support frame on which a lower end of the hinge arm is pivotally supported so that the seat cushion can be raised forward, and the cushion frame is supported at a seating position of the seat cushion;
A pair of brackets erected on the rear part of the support frame and a pair of engagement holes formed on the lower surface of the rear part of the cushion frame to engage the pair of brackets at the seat cushion seating position. Horizontal position regulating means;
A lock mechanism comprising: a striker provided between the pair of brackets; and a latch provided in a rear lower surface of the cushion frame so as to be detachably engaged with the striker at a seating position of the seat cushion. When,
In a vehicle seat provided with
A hook having a downward locking surface is formed by notching a rear edge in the vehicle longitudinal direction of the pair of brackets, and the locking surface is formed by the pair of engagement holes at the seat cushion seating position. In a state of being engaged with the pair of brackets, the gap is higher than the peripheral edge portions of the pair of engaging holes, and a gap larger than the thickness of the peripheral edge portion is defined below the locking surface. A structure for preventing separation of a vehicle seat.   The structure for preventing the separation of the vehicle seat according to claim 1, further comprising an inclined edge portion that is inclined toward the front side of the vehicle with respect to a standing direction of the pair of brackets, below the locking surface.   The pair of brackets have a flange projecting in the vehicle width direction at a peripheral portion of a plate-like main body oriented in the vehicle front-rear direction, and the locking surface of the hook cuts out the flange to front the vehicle 3. The structure for preventing the separation of a vehicle seat according to claim 2, wherein the structure is formed as an upper edge of a U-shaped notch that enters into the side.   The support frame is formed in a quadrangular frame shape from a pair of side frames disposed on both sides, and a front cross section and a rear cross frame that are rigidly coupled to each other, and the pair of brackets are formed in the plate shape It is fixed by welding to the rear side of the rear cross frame made of a round pipe at the joining edge portion where the main body is cut out in an arc shape, and the lower end portions of the pair of brackets extend to the lower end portions of the rear cross frame. The structure for preventing the separation of a vehicle seat according to claim 3.

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