JPH08300991A - Safety lock mechanism of set for vehicle - Google Patents

Abstract

PURPOSE: To provide a safety lock mechanism capable of surely locking a seat even when a large deceleration/acceleration is applied to the seat in the lock-off condition. CONSTITUTION: A manual lock device and an emergency lock device are continuously arranged, and a seat is usually locked by the manual lock device while the seat is locked by the emergency lock device in an emergency such as the collision of a vehicle in a condition where the manual lock device is locked off. The emergency lock device consists of a slide screw 36 and a slide nut which are screwed to each other, and where the lead of the screw is larger than the angle of friction, an oscillatable lock piece 48 which is integratedly turned with the slide screw 36, and a member 32a to be locked which is arranged on the periphery of the lock piece 48. In an emergency, the lock piece 48 which is rapidly rotated together with the slide screw 36 is oscillated, and engaged with the member 32a to make an emergency lock of the seat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety lock mechanism for a seat slide device provided on a vehicle seat, and more specifically, a large deceleration of the seat due to a collision of the vehicle or the like while adjusting the front-rear position of the seat. The present invention relates to a safety lock mechanism that reliably locks a seat when added.

[0002]

2. Description of the Related Art As a conventional seat slide device, for example, Japanese Patent Publication No. 62-61462 discloses a one-stage feed seat slide adjuster. This adjuster slides the seat while alternately fitting the two lock plates to the plurality of latches formed on the latch plate. During the seat slide, one lock plate is always Mates with the latch.

Further, Japanese Utility Model Publication No. 62-42834 discloses that
A seat slide device that locks a seat by utilizing inertial force is disclosed. This seat slide device has 2
Independent locking parts, one of which is used as a manual lock for normal seat movement, and the other of which is inertia locked so that the seat is automatically locked when a sudden deceleration occurs due to a vehicle collision. Is.

Further, Japanese Utility Model Publication No. 63-46258 discloses that
Disclosed is a locking device for a seat slide device in which an inclined surface is provided in front of and behind the lock hole so that the lock plate can be easily inserted into the lock hole.

[0005]

Among the matters described in the prior art, the seat slide adjuster disclosed in Japanese Patent Publication No. 62-61462 moves the seat in the front-rear direction while operating the operation lever by one pitch. Therefore, the operation of the operation lever is troublesome and it takes time to move the seat.

[0006] Further, the structure 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 it is effective when the lock lever is being operated. There is no.

Further, in the lock device disclosed in Japanese Utility Model Publication No. 63-46258, if the deceleration is applied to the seat while adjusting the front-rear position of the seat, the lock plate is securely moved along the inclined surface. There is no guarantee that it will be stuck in the lock hole.

The present invention has been made in view of the above 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 collision of the vehicle or the like. The purpose of the present invention is to provide a safety lock mechanism that can reliably lock the seat even when a load is applied.

[0009]

In order to achieve the above object, a safety lock mechanism of the present invention is fixed to a pair of lower rails fixed to a vehicle floor and an upper rail slidably attached to the lower rails. In the above vehicle seat, a manual lock device and an emergency lock device are arranged side by side, and the manual lock device is provided by fitting the operation lever, a lock member operated by the operation lever, and the lock member. While comprising a latch plate for locking the seat, the emergency locking device, a slide screw rotatably attached to the upper rail, and a slide nut screwed into the slide screw and fixed to the lower rail, A lock piece swingably attached to the slide screw, and the lock piece attached to the slide screw. And an elastic member biasing toward,
An inertia member rotatably attached to the slide screw, and a lock member that is arranged around the lock piece and that can be inserted into and removed from the lock piece. Has a lead having a friction angle or more, and after releasing the lock of the manual lock device, the slide screw is rotated by a load applied to the seat to make the upper rail and the lower rail movable relative to each other. A rapid rotation of the slide screw due to a deceleration of a predetermined value or more applied to the seat causes the inertia member to engage the lock piece with the locked member against the biasing force of the elastic member, It is characterized in that the slide screw is emergency locked.

The locked member is constructed by a casing in which the front end of the slide screw is rotatably supported, and the lock piece engages with a lock groove formed inside the casing for emergency locking. Good.

It is effective to perform an emergency lock by integrally forming a weight on the inertia member and engaging the lock piece with the locked member by the weight.

A support plate can be fixed to the slide screw, and a lock piece can be swingably attached to the support plate.

[0013]

Since the manual lock device and the emergency lock device are installed side by side, in the normal state, the seat is locked by the manual lock device, and the manual lever is operated to release the manual lock device, so that the seat is moved forward and backward. The position can be adjusted. Further, when a large deceleration is applied to the seat due to a collision of the vehicle or the like while adjusting the front-rear position of the seat, the emergency lock device is activated to immediately lock the seat.

The member to be locked is formed of a casing in which the front end of the slide screw is rotatably supported, and a lock groove is formed inside the casing, so that in an emergency,
The lock piece engages with the lock groove to lock the seat.

When the weight is formed integrally with the inertia member, the lock piece rapidly rotates together with the slide screw in an emergency, but the inertia member tries to maintain its position against the rotational force, so that the weight is locked. The piece acts to engage the locked member to emergency lock the seat.

When the support plate is fixed to the slide screw and the lock piece is swingably attached to the support plate, the lock piece rapidly rotates together with the support plate due to the abrupt rotation of the slide screw in an emergency.
Emergency locking of the seat by engaging the inertia member.

[0017]

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 the left and right seat tracks. The safety lock mechanism includes a known manual lock device 10 and an emergency lock device 30.

Each seat track is composed of a lower rail 2 fixed to the vehicle floor and an upper rail 4 surrounding the lower rail 2 from above and slidably attached to the lower rail 2, and the seat is placed on the upper rail 4. (Not shown) is fixed.

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 operating lever 12 is biased in the direction of arrow A by a coil spring 18 wound around the rear end of the operating lever 12. A lock member 20 having a claw piece 20 a is fixed to the operation lever 12 in the rear bracket 16, while the lower rail 2 has a plurality of latches 22.
The latch plate 22 having a is fixed, and 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 by the biasing force of the coil spring 18 to lock the seat. are doing.

The emergency locking device 30 includes a front casing 32 and a rear casing 34, and slides having both ends rotatably attached to the front and rear casings 32 and 34 and extending parallel to the upper rail 4. A screw 36 and a slide nut 38 screwed with the slide screw 36 are provided. The front and rear casings 32 and 34 are respectively screwed to a front casing bracket 40 and a rear casing bracket 42 that are fixed to the front and rear end upper surfaces of the upper rail 4, and the slide nut 38 is attached to the lower rail 2. It is fixed to a nut bracket 44 fixed to the lower surface.

As the screws for the slide screw 36 and the slide nut 38, those whose leads have a friction angle larger than that of the friction angle are selected. With the manual lock device 10 locked off, the slide screw is pulled from the seat through the upper rail 4. When a load in the front-rear direction is applied to 36, 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.

FIG. 2 shows the front casing 32 and its internal structure. As shown in FIG. 2, the front casing 32 comprises a pair of front casing halves 32a and 32b, and locking means is provided inside thereof. An accommodation space 32c is formed. The locking means is the slide screw 3
6, a support plate 46 that is attached to a locking portion 36a formed at the front end of the slide screw 6 and that rotates integrally with the slide screw 36; and, like the support plate 46, is attached to the locking portion 36a of the slide screw 36 and slides. The screw 36 and a pressing plate 54 that rotates integrally with each other are provided, and a pair of swingable lock pieces 48, 48 and an inertia member 52 are interposed between the support plate 46 and the pressing plate 54. There is.

The support plate 46 is integrally formed with a projecting portion 46a projecting forward. The projecting portion 46a is formed.
Has approximately the same height as the wall thickness of the lock pieces 48, 48, and has lock piece storage spaces 46b, 46b for storing the lock pieces 48, 48 on both sides thereof.
The support plate 46 also includes a spring retainer 46c that is integrally formed and is slightly separated from the projecting portion 46a, and the center portion of the spring 50 is fitted between the projecting portion 46a and the spring retainer 46c. As a result, the spring 50 is attached to the support plate 46, and biases the lock pieces 48, 48 attached to both sides of the protruding portion 46a inward.

The holding plate 54 is integrally formed with a disk-shaped inertia member holding portion 54a protruding rearward, while the inertia member 52 has an inner diameter slightly larger than the outer diameter of the inertia member holding portion 54a. A circular hole 52a having the holding plate 5 is formed through the circular hole 52a.
The inertial member holding portion 54a of No. 4 is rotatably attached. A weight 52b is integrally formed on a part of the rear end surface of the inertia member 52.

After the lock pieces 48, 48 and the spring 50 are attached to the support plate 46, and the inertia member 52 is attached to the holding plate 54, the support plate 46 and the holding plate 54 are inertial with the front end surface of the projecting portion 46a. The rear end surface of the member holding portion 54a is fixed to the locking portion 36a of the slide screw 36, and the nut 56 is screwed onto the screw portion 36b of the slide screw 36.

Here, each lock piece 48 has a base end 48a serving as a swing center, a free end 48b opposed to one side surface of the weight 52b of the inertia member 52, and the front casing half 3.
2a includes a large number of lock grooves 32d formed on the inner surface and an engaging projection 48c that can be freely inserted and removed.
Since the support plate 46, the lock pieces 48, 48, the inertia member 52, and the holding plate 54 are all pressed by the biasing force of the slide screw 3 in a normal state.
It is configured to rotate integrally with 6.

The operation of the safety lock mechanism according to the present invention having the above structure will be described. The operating lever 12 is constantly urged by the coil spring 18 in the direction of arrow A in FIG. 1, and when there is no need to adjust the front-back position of the seat, the claw pieces 20a of the lock member 20 are provided with a plurality of latch plates 22. By engaging with one of the latches 22a, the rotation of the slide screw 36 is blocked,
The seat is locked in its current position.

When it is necessary to adjust the front-rear position of the seat, when the operating 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 locking device 30 are screwed together, but the lead angle of the screw is set to be larger than the friction angle. The screw 36 rotates, and it becomes possible to appropriately adjust the front-back position of the seat.

When a large deceleration is applied to the lower rail 2 due to a vehicle collision or the like in a so-called lock-off state in which the operating lever 12 is operated to adjust the front-back position of the seat, a force in the front-back direction is applied to the slide nut 38. The slide screw 36 starts to rotate rapidly. At this time, the support plate 46 fixed to the slide screw 36 and the pressing plate 54 also start to rotate rapidly at the same time, but since the inertia member 52 is rotatably supported with respect to the slide screw 36, the weight 52b rotates. Acts against force to hold its position. As a result, one of the lock pieces 48, 48 is expanded in diameter by the weight 52b, and the engaging protrusion 48c of the expanded lock piece 48 is formed in the lock groove 32 formed on the inner surface of the front casing half 32a.
Engages d, blocking rotation of the slide screw 36 and locking the seat in its current position.

[0030]

Since the present invention is configured as described above, it has the following effects.

Since the manual lock device and the emergency lock device are provided side by side, the seat lock in the normal state is performed by the manual lock device, and the emergency lock is performed in an emergency such as a vehicle collision in the lock-off state in which the manual lock device is released. The seat is locked by the device so that the seat is locked in all cases.

[Brief description of drawings]

FIG. 1 is a perspective view of a vehicle seat slide device including a safety lock mechanism according to the present invention.

FIG. 2 is an exploded perspective view showing a main part of an emergency lock device provided in the safety lock mechanism of FIG.

[Explanation of symbols]

 2 Lower rail 4 Upper rail 10 Manual locking device 12 Operating lever 20 Locking member 22 Latch plate 30 Emergency locking device 32 Front casing 36 Slide screw 38 Slide nut 46 Support plate 48 Lock piece 50 Spring 52 Inertial member 54 Holding plate

Claims (4)

[Claims] 1. A pair of lower rails fixed to a vehicle floor, and a vehicle seat fixed to an upper rail slidably attached to the lower rails, wherein a manual lock device and an emergency lock device are provided side by side. The manual lock device includes an operation lever, a lock member operated by the operation lever, and a latch plate that locks the seat by fitting the lock member,
The emergency lock device includes a slide screw rotatably attached to the upper rail, a slide nut screwed with the slide screw and fixed to the lower rail, and a lock swingably attached to the slide screw. A piece, an elastic member for urging the lock piece toward the slide screw, an inertia member rotatably attached to the slide screw, the lock piece arranged around the lock piece, and the lock piece. The slide screw and the screw of the slide nut have a lead having a friction angle or more, and the slide is applied by the load applied to the seat after the lock of the manual lock device is released. The screw rotates to allow the upper rail and the lower rail to move relative to each other. On the other hand, the inertial member engages the lock piece with the locked member against the biasing force of the elastic member due to the abrupt rotation of the slide screw due to the deceleration of a predetermined value or more applied to the seat. A safety lock mechanism for a vehicle seat, characterized in that the slide screw is emergency locked. 2. The emergency according to claim 1, wherein the locked member comprises a casing in which a front end of the slide screw is rotatably supported, and the lock piece engages with a lock groove formed inside the casing. The vehicle seat safety lock mechanism according to claim 1, wherein the safety lock mechanism is locked. 3. The vehicle seat according to claim 1, wherein a weight is integrally formed on the inertia member, and the weight is adapted to engage the lock piece with the locked member for emergency locking. Safety lock mechanism. 4. 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.