JPH0224661Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking device for a seat slide device for adjusting the longitudinal position of a vehicle seat.

1 to 3 are diagrams for explaining a conventional locking device of this type and its problems. As is well known, the seat slide device is comprised of a pair of left and right seat tracks 11, 11 and a lock device 15 provided on one of them. Each seat track 11 includes a fixed rail (lower rail) 12 fixed to the vehicle floor, and a sliding rail (upper rail) slidably fitted to the fixed rail 12.
13, and this sliding rail 13 is fixed to the lower surface of the seat. This locking device 15 has a stopper bracket 16 fixed to the fixed rail 12.
The lock plate 18 is supported on the slide rail 13 via a support bracket 17, and the stopper bracket 16 is provided with a row of lock holes 19 aligned in the front-rear direction. FIG. 3 shows the individual shapes of the stopper bracket 16 and the lock plate 18 before being fixed to the fixed rail 12.

The lock plate 18 has a width that allows it to fit into the lock hole 19 without any gap.
Support bracket 1 can be moved linearly towards
It is supported by 7. Also this lock plate 1
8 has an interlocking hole 23 drilled therein as shown in FIG. 2, and an interlocking pin 22 of an operating lever 21 pivotally connected to the support bracket 17 by a pin 20 is fitted into this interlocking hole 23. When the lock plate 21 is swung in the direction of the arrow, the lock plate 18 moves in a direction in which it is removed from the lock hole 19. The lock plate 18 is biased toward the lock hole 19 by a spring means (not shown).

In this conventional device, when the operating lever 21 is swung in the direction A, the lock plate 18 locks into the lock hole 19.
The sliding rail 13 can be moved freely relative to the fixed rail 12. When the operating lever 21 is released after the position adjustment, the lock plate 18 is fitted into the lock hole 19 corresponding to the adjusted position due to the spring force and is locked again. However, this conventional locking device 15 has a problem in that when acceleration is applied to the seat in the unlocked state, so-called tooth skipping occurs. In particular, when adjusting the seat position when an external force is applied to the seat in the longitudinal direction or when acceleration is applied to the seat, such as when starting or stopping, release the operating lever 21 and lock the lock plate 18.
Even if the lock plate 18 is able to fit into the lock hole 19, the lock plate 18 will not fit into the nearest lock hole 19, but will jump over one or more lock holes 19, and in the worst case, the slide rail 13 will slide back and forth. A tooth skipping phenomenon occurs in which the tooth reaches the edge.

This invention was developed as a result of analyzing the cause of this tooth skipping phenomenon with the aim of preventing the tooth skipping phenomenon.
It is characterized in that a narrow part with a constant width narrower than the lock hole is formed at the tip, and this narrow part and the lock part are connected by tapered parts on the left and right sides.

In other words, the tooth skipping phenomenon in the conventional device is thought to be caused by the fact that the lock plate cannot move toward the lock hole unless the entire position of the lock plate is accurately aligned with the lock hole. Then, when the narrow part of the lock plate reaches the lock hole position, the lock plate starts to move toward the lock hole, and since the narrow part enters the lock hole, it continues to the narrow part of the lock plate. The lock part can easily enter the lock hole, and tooth skipping phenomenon can be prevented. Also, since the narrow part has a constant width,
A certain level of locking strength is obtained when the narrow portion is inserted into the locking hole, and higher safety is obtained than, for example, when the entire portion is formed in a tapered shape.

The invention will now be described with reference to the illustrated embodiments. FIG. 4 shows an embodiment of the lock plate 30 used in the lock device of the present invention. This lock plate 30 does not have a uniform width at the part that is inserted into the lock hole 19, but has a narrow part 31 having a length B and having locking surfaces 31a on both sides at the tip thereof. Following the narrow part 31, the left and right tapered parts 31
b and a lock portion 32 are formed.

The narrow portion 31 and the lock portion 32 both have a constant width, and both surfaces thereof are parallel to each other and perpendicular to the lock hole 19. The lock portion 32 has a width that allows it to fit into the lock hole 19 without any gap. "Without a gap" means that the lock plate 30 does not substantially move back and forth when the lock portion 32 is fitted into the lock hole 19, that is, the seat is maintained in the locked state.

The rest of the structure is the same as the conventional example shown in FIGS. 1 to 3, and the device of the present invention is realized by using this lock plate 30 in place of the conventional lock plate 18.

Therefore, according to the device of the present invention, when the lock plate 30 is removed from the lock hole 19 and the sliding rail 13 is moved relative to the fixed rail 12, and the operating lever 21 is released in this state, acceleration is applied to the seat. Even if the worst situation occurs, the tooth skipping phenomenon can be prevented. That is, when the sliding rail 13 moves relative to the fixed rail 12,
The lock plate 30 is secured to the lock hole 1 by spring means.
Since it is urged to move toward the 9 side, the tip of the narrow portion 31 moves while coming into contact with the stopper bracket 16. If the narrow portion 31 enters the lock hole 19 even slightly, either one of the locking surfaces 31a on both sides of the narrow portion 31 having a constant width abuts and engages with the lock hole 19 and is temporarily locked. It takes. This lock is
Since the locking surface 31a and the lock hole 19 are engaged by a right angle abutting engagement, it is reliable. If the narrow part 31 is deformed or the lock plate 3
There is no risk that 0 will escape from the lock hole 19. Then, due to the force of the spring means, the tapered portion 31b
The lock portion 32 enters the lock hole 19 through the lock hole 19 and is completely locked. Tapered part 3
1b is useful for guiding the locking part 31 into the locking hole 19.

In the conventional device, as shown in FIG. 3, the lock plate 16 cannot be moved toward the lock hole 19 unless the entire lock plate 16 and the lock hole 19 are in exact alignment, and the positions of both are incorrect. Since the matching time is shorter as the moving speed of the sheet is faster, this is thought to be the cause of the tooth skipping phenomenon, and it is understood that the present invention can prevent tooth skipping.

Although the above embodiment is of a type in which the stopper bracket 16 is constructed from a separate member from the fixed rail 12, the present invention is of course applicable to a type in which the stopper bracket is formed directly on a portion of the fixed rail 12. . In this case, it is common to form a lock plate insertion hole in the slide rail. Further, the support mechanism and moving mechanism of the lock plate 30 are not limited to the above example, but in short, the support mechanism and moving mechanism of the lock plate 30 are not limited to the above example.
Any type of device may be used as long as the 0 can be inserted into and removed from the lock hole 19.

As described above, according to the lock device of the present invention, when the slide rail moves in the unlocked state, the narrow portion formed at the tip of the lock plate reliably enters the lock hole, so that the lock plate and the lock are locked together. It always engages with the hole and can stop the movement of the slide rail. Therefore, the tooth skipping phenomenon becomes less likely to occur. In particular, since the narrow part of the lock plate has a constant width, a reliable primary locking action can be obtained when abutting and engaging with the lock hole. Since it is connected to the lock part through the lock part, the lock part can be reliably inserted into the lock hole. Furthermore, when moving the seat forward or backward, it is possible to obtain a primary locking effect by the narrow portion and a main locking effect by the tapered portion and the locking portion.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a locking device of a conventional seat slide device, FIG. 2 is a perspective view showing an example of the shape of a stopper bracket and a lock plate used in the conventional device shown in FIG. 1, and FIG. The figure is a sectional view showing the relationship between the stopper bracket and the lock plate, FIG. 4 is a plan view showing an embodiment of the lock plate used in the lock device of the present invention, and FIG. 5 is the relationship between the stopper bracket and the lock plate. FIG. 11... Seat track, 12... Fixed rail, 13... Sliding rail, 15... Lock device,
19...Lock hole, 21...Operation lever, 30...
...Lock plate, 31...Narrow part, 31a...
Locking surface, 31b...Tapered portion, 32...Lock portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A row of lock holes is provided in the stopper bracket on the side of the fixed rail that is fixed to the vehicle floor, and that the lock hole row is provided on the side of the sliding rail that is slidably fitted on the fixed rail and fixed to the seat. , is urged to move toward the lock hole row side,
and a locking device for a seat slide device that supports a lock plate that can be inserted into and removed from each of the lock holes, and the lock plate has a lock portion of a constant width that fits into the lock hole without a gap, and a lock portion of a constant width that is narrower than the lock portion. 1. A locking device for a seat slide device, comprising a narrow end width portion and tapered portions on both sides connecting the locking portion and the narrow width portion.