JP3681436B2 - Safety lock mechanism for vehicle seat - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a safety lock mechanism for a seat slide device provided on a vehicle seat, and more specifically, when a large deceleration is applied to the seat due to a vehicle collision or the like during adjustment of the front / rear position of the seat. The present invention relates to a safety lock mechanism that can be surely locked.
[0002]
[Prior art]
As a conventional seat slide device, for example, Japanese Patent Publication No. 62-61462 discloses a one-stage feed seat slide adjuster. In this adjuster, the seat is slid while the two lock plates are alternately fitted to the plurality of latches formed on the latch plate. Mates with the latch.
[0003]
Japanese Utility Model Publication No. 62-42834 discloses a seat slide device that locks a seat using inertial force. This seat slide device has two left and right locking parts, and one is a manual lock type that is used during normal seat movement, and the other is an inertia lock type that is used when a sudden deceleration occurs due to a vehicle collision or the like. Is automatically locked.
[0004]
Japanese Utility Model Publication No. 63-46258 discloses a locking device for a seat slide device in which inclined surfaces are provided before and after the lock hole so that the lock plate can be easily inserted into the lock hole.
[0005]
[Problems to be solved by the invention]
Among those described in the prior art, the seat slide adjuster disclosed in Japanese Patent Publication No. 62-61462 needs to move the seat back and forth while operating the operation lever one pitch at a time. Is troublesome and takes time to move the sheet.
[0006]
Further, the one disclosed in Japanese Utility Model Publication No. 62-42834 has a structure in which the lock plate is immediately locked by the operation of the G (deceleration) sensor, but there is no effect during the operation of the lock lever.
[0007]
Furthermore, in the locking device disclosed in Japanese Utility Model Publication No. 63-46258, when a deceleration is applied to the seat when the front-rear position of the seat is adjusted, the lock plate is securely locked along the inclined surface. There is no guarantee that you will be swallowed.
[0008]
The present invention has been made in view of such problems of the prior art, and when the seat is slid by operating the operation lever, a large deceleration is applied to the seat due to a vehicle collision or the like. Even in such a case, an object is to provide a safety lock mechanism that can securely lock the seat.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a safety lock mechanism according to the present invention includes a pair of lower rails fixed to a vehicle floor and a vehicle seat fixed to an upper rail slidably attached to the lower rail. The manual lock device is composed of an operation lever, a lock member operated by the operation lever, and a latch plate for locking the seat by fitting with the lock member. On the other hand, the emergency locking device is attached to a slide screw rotatably attached to the upper rail, a slide nut screwed to the slide screw and fixed to the lower rail, and swingably attached to the slide screw. Lock piece and an elastic member for urging the lock piece toward the slide screw And an inertia member rotatably attached to the slide screw, and a lock member which is disposed around the lock piece and is detachable from the lock piece. The screw has a lead having a friction angle or more, and after the lock of the manual lock device is released, the slide screw is rotated by a load applied to the seat so that the upper rail and the lower rail can be moved relative to each other. On the other hand, due to a rapid rotation of the slide screw due to a deceleration greater than a predetermined value applied to the seat, the inertia member engages the lock piece against the urging force of the elastic member. The slide screw is emergency-locked.
[0010]
It is preferable that the member to be locked is constituted by a casing in which a front end of a slide screw is rotatably supported, and an emergency lock is performed by engaging a lock piece with a lock groove formed inside the casing.
[0011]
It is effective to form an emergency weight by integrally forming a weight on the inertia member and engaging the lock piece with the member to be locked by the weight.
[0012]
A support plate can be fixed to the slide screw, and a lock piece can be swingably attached to the support plate.
[0013]
[Action]
Since the manual locking device and the emergency locking device are arranged side by side, the seat is locked by the manual locking device in the normal state, and the front and rear positions of the seat are adjusted by operating the operating lever to release the manual locking device. can do. In addition, when a large deceleration is applied to the seat due to a vehicle collision or the like while adjusting the front / rear position of the seat, the emergency lock device is activated to immediately lock the seat.
[0014]
The locked member is composed of a casing in which the front end of the slide screw is rotatably supported. By forming a lock groove inside the casing, the lock piece engages with the lock groove to lock the seat in an emergency. .
[0015]
When the weight is formed integrally with the inertia member, the lock piece rotates suddenly together with the slide screw in an emergency, but the inertia member tries to hold its position against the rotational force, so the weight covers the lock piece. It acts to engage with the locking member and urgently locks the seat.
[0016]
When the support plate is fixed to the slide screw and the lock piece is swingably attached to the support plate, the lock piece suddenly rotates with the support plate due to the sudden rotation of the slide screw in an emergency, and engages with the inertia member. To emergency lock the seat.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show a seat slide device provided with a safety lock mechanism according to the present invention. This seat slide device is composed of a pair of left and right seat tracks and a safety lock mechanism provided on one of them, and the safety lock mechanism includes a known manual lock device 10 and an emergency lock device 30.
[0018]
Each seat track includes a lower rail 2 fixed to the vehicle floor and an upper rail 4 that surrounds the lower rail 2 from above and is slidably attached to the lower rail 2. A seat (not shown) is placed on the upper rail 4. ) Is fixed.
[0019]
The manual lock device 10 is operated by an operation lever 12 rotatably attached to the upper rail 4 via an L-shaped front bracket 14 and a U-shaped rear bracket 16. The operation lever 12 is urged in the direction of arrow A by a coil spring 18 wound around its rear end. A lock member 20 having a claw piece 20a is fixed to the operation lever 12 in the rear bracket 16, while a latch plate 22 having a plurality of latches 22a is fixed to the lower rail 2, and a coil spring 18 is fixed. Due to this urging force, the claw piece 20a of the lock member 20 is engaged with any one of the plurality of latches 22a formed on the latch plate 22, thereby locking the seat.
[0020]
The emergency lock device 30 includes a front casing 32 and a rear casing 34, and slide screws 36 that are rotatably attached to the front and rear casings 32 and 34 and that extend parallel to the upper rail 4. And a slide nut 38 screwed with the slide screw 36. The front and rear casings 32 and 34 are respectively screwed into a front casing bracket 40 and a rear casing bracket 42 fixed to the upper surfaces of the front and rear ends of the upper rail 4, and the slide nut 38 is attached to the lower rail 2. The nut bracket 44 is fixed to the lower surface.
[0021]
As the screws of the slide screw 36 and the slide nut 38, those whose lead is larger than the friction angle are selected. With the manual lock device 10 locked off, the slide screw 36 and the slide nut 38 are moved back and forth from the seat to the slide screw 36 via the upper rail 4. When a direction load is applied, the slide screw 36 rotates, and the upper rail 4 and the seat move in the front-rear direction with respect to the lower rail 2.
[0022]
FIG. 2 shows the front casing 32 and the internal structure thereof. As shown in FIG. 2, the front casing 32 is composed of a pair of front casing halves 32a and 32b, and the lock means accommodating space 32c is provided therein. Is formed. The locking means is attached to a locking portion 36 a formed at the front end of the slide screw 36, and a support plate 46 that rotates integrally with the slide screw 36. Similarly to the support plate 46, the locking portion of the slide screw 36. 36a, and includes a presser plate 54 that rotates integrally with the slide screw 36. Between the support plate 46 and the presser plate 54, a pair of swingable lock pieces 48, 48 and an inertia member 52 are provided. Is intervening.
[0023]
The support plate 46 is integrally formed with a protruding portion 46a that protrudes forward. The protruding portion 46a has substantially the same height as the thickness of the lock pieces 48, 48, and is formed on both sides thereof. Lock piece accommodating spaces 46b, 46b for accommodating the lock pieces 48, 48 are formed. The support plate 46 also includes a spring retainer 46c that is integrally formed and slightly spaced from the projecting portion 46a, and the central portion of the spring 50 is inserted between the projecting portion 46a and the spring retainer 46c. As a result, the spring 50 is attached to the support plate 46, and urges the lock pieces 48, 48 attached to both sides of the protruding portion 46a inward.
[0024]
The presser plate 54 is integrally formed with a disc-shaped inertia member holding portion 54a that protrudes rearward, while the inertia member 52 has a circular hole having an inner diameter slightly larger than the outer diameter of the inertia member holding portion 54a. The inertia member 52 is rotatably attached around the inertia member holding portion 54a of the presser plate 54 through the circular hole 52a. A weight 52b is integrally formed on a part of the rear end surface of the inertia member 52.
[0025]
After the lock pieces 48 and 48 and the spring 50 are attached to the support plate 46 and the inertia member 52 is attached to the presser plate 54, the support plate 46 and the presser plate 54 are connected to the front end surface of the projecting portion 46a and the inertia member holding portion. The nut 56 is screwed onto the threaded portion 36b of the slide screw 36 while being fixed to the locking portion 36a of the slide screw 36 with the rear end surface of the contact surface 54a in contact.
[0026]
Here, each lock piece 48 includes a base end 48a serving as a swing center, a free end 48b facing one side of the weight 52b of the inertia member 52, and a number of locks formed on the inner surface of the front casing half 32a. The groove 32d and the engagement protrusion 48c that can be freely inserted and removed are provided. However, since they are pressed inward by the urging force of the spring 50, the support plate 46, the lock pieces 48 and 48, and the inertia member 52 are in a normal state. The presser plate 54 is configured to rotate integrally with the slide screw 36.
[0027]
The operation of the safety lock mechanism according to the present invention having the above configuration will be described.
The operation lever 12 is always urged in the direction of arrow A in FIG. 1 by the coil spring 18, and when there is no need to adjust the front-rear position of the seat, the claw pieces 20 a of the lock member 20 are provided with a plurality of latch plates 22. By fitting with either of the latches 22a, the rotation of the slide screw 36 is prevented, and the seat is locked at the current position.
[0028]
When it is necessary to adjust the front-rear position of the seat, when the operation lever 12 is operated in the direction opposite to the arrow A, the engagement between the lock member 20 and the latch plate 22 is released. At this time, the slide screw 36 and the slide nut 38 of the emergency lock device 30 are screwed together, but the lead angle of the screw is set larger than the friction angle. The screw 36 rotates and the front and rear positions of the seat can be adjusted as appropriate.
[0029]
In a so-called lock-off state in which the front and rear positions of the seat are adjusted by operating the operation lever 12, if a large deceleration is applied to the lower rail 2 due to a vehicle collision or the like, a longitudinal force is applied to the slide nut 38, and the slide screw 36 begins to rotate rapidly. At this time, the support plate 46 and the presser plate 54 fixed to the slide screw 36 also start to rotate suddenly at the same time. However, since the inertia member 52 is rotatably supported with respect to the slide screw 36, the weight 52b rotates. Acts to hold its position against force. As a result, one of the lock pieces 48 is expanded by the weight 52b, and the engagement protrusion 48c of the expanded lock piece 48 is engaged with the lock groove 32d formed on the inner surface of the front casing half 32a. The rotation of the slide screw 36 is prevented and the seat is locked at the current position.
[0030]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0031]
Since the manual lock device and the emergency lock device are arranged side by side, the normal seat lock is performed by the manual lock device. In an emergency such as a vehicle collision in a lock-off state in which the manual lock device is released, the emergency lock device seats. Since the locking is performed, the seat is surely locked in any case.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle seat slide device including a safety lock mechanism according to the present invention.
2 is an exploded perspective view showing a main part of an emergency lock device provided in the safety lock mechanism of FIG. 1; FIG.
[Explanation of symbols]
2 Lower rail 4 Upper rail 10 Manual lock device 12 Operation lever 20 Lock member 22 Latch plate 30 Emergency lock device 32 Front casing 36 Slide screw 38 Slide nut 46 Support plate 48 Lock piece 50 Spring 52 Inertial member 54 Press plate

Claims (4)

In a vehicle seat fixed to a pair of lower rails fixed to a vehicle floor and an upper rail slidably attached to the lower rails,
A manual locking device and an emergency locking device are arranged side by side, and the manual locking device includes an operation lever, a lock member operated by the operation lever, and a latch plate for locking the seat by fitting the lock member. On the other hand, the emergency lock device includes a slide screw rotatably attached to the upper rail, a slide nut screwed to the slide screw and fixed to the lower rail, and swingable to the slide screw. A lock piece attached to the slide screw, an elastic member for urging the lock piece toward the slide screw, an inertia member rotatably attached to the slide screw, and a periphery of the lock piece. In addition, the slide piece and the slide navigator are configured by the lock piece and a detachable locked member. The screw has a lead with a friction angle or more, and after the lock of the manual lock device is released, the slide screw is rotated by the load applied to the seat, and the upper rail and the lower rail can be moved relative to each other. On the other hand, the inertia member engages the locking piece against the urging force of the elastic member by abrupt rotation of the slide screw due to a deceleration greater than a predetermined value applied to the seat. A safety lock mechanism for a vehicle seat, wherein the slide screw is urgently locked together. The member to be locked is composed of a casing in which the front end of the slide screw is rotatably supported, and the lock piece is engaged with a lock groove formed inside the casing so as to be emergency locked. The safety lock mechanism for a vehicle seat according to claim 1. 2. The safety lock mechanism for a vehicle seat according to claim 1, wherein a weight is integrally formed on the inertia member, and the lock piece is engaged with the member to be locked by the weight to be emergency locked. The safety lock mechanism for a vehicle seat according to claim 1, wherein a support plate is fixed to the slide screw, and the lock piece is swingably attached to the support plate.

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