JPH0645320B2 - Lock structure for seat slide device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lock structure for a seat slide device having a first rail and a second rail that are axially slidable relative to each other, and particularly to any arbitrary structure. A locking structure of the above type which is capable of engaging the lock in a sliding position.

<Prior Art> A plurality of lock holes formed at equal intervals along the axial direction on the side of the first rail, and on the side of the second rail so as to be selectively engageable with these lock holes. Various locking structures for a seat slide device including a hinged lock tooth have been known. However, when the lock tooth is located at an intermediate position between two adjacent lock holes, the lock tooth and the lock hole are separated from each other. Since the lock teeth cannot be engaged, the lock teeth can be engaged only at the position where the lock teeth are fitted into the lock holes. Therefore,
In order to engage the lock again after moving the seat back and forth, in most cases, the seat is moved slightly back and forth to fit the lock teeth into the lock holes. Therefore, not only the lockable position of the seat is limited, but also the number of steps for engaging the lock increases.

<Problems to be Solved by the Invention> In view of such drawbacks of the prior art, the main object of the present invention is to
An object of the present invention is to provide a lock structure for a seat slide device that can lock a seat at any position.

<Means for Solving the Problems> According to the present invention, a seat slide device having a first rail and a second rail that are parallel to each other in the axial direction and are slidable with respect to each other is provided. And a plurality of lock holes formed at equal intervals along the axial direction on the side of the first rail at a pitch P,
N movable lock members hinged to the second rail side at equal intervals along the axial direction at a pitch z so as to be individually tiltable about the axis, and to engage with the lock holes And one lock tooth formed at the same phase position of each lock member so as to be disengaged, and the width of the lock tooth is x,
When the width of the lock hole is a, P = nz / (n-1) and {z / (n-1)} + x <a (where n = 2, 3, ...). It is achieved by providing a locking structure characterized by:

When a plurality of (m) teeth are provided on each lock member at a pitch P, P = nz / m (n-1) and {(nm) z / m (n-1)} + x <a (However, n = 2, 3, ..., M = 2, 3 ,.
Even in the case of m), the object of the present invention can be achieved.

<Operation> By determining the width of the lock hole as described above based on the pitch cycle of the lock hole and the width of the lock hole, the lock teeth of at least one movable lock member can be engaged with the lock hole at any position. it can. In particular, when m = n-1, the play between the lock teeth and the lock hole can be minimized,
The width of the lock tooth can be maximized when (m-1) P + x = z.

<Embodiment> A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view schematically showing the entire seat slide device having a lock structure according to the present invention.

The lower rail 1 is fixed to the floor surface of the vehicle by a bracket (not shown), and the upper rail 4 is fixed to the seat. As best shown in FIG. 2, a holding member 8 having an Ω-shaped cross section is connected to the upper rail 4 so as to be received inside the lower rail 1 forming a channel member. The upper rail 4 and the lower rail 1 are slidably combined with each other through a sliding member 9 made of synthetic resin integrally molded with the above.

Further, the lock lever shaft 5 is axially supported so as to be rotatable with respect to the sliding member 9 along an axis of the sliding member 9 at a substantially central portion. Window 6 cut in upper rail 4
Movable lock members 7a and 7b are hinged to the portion of the lock lever shaft 5 facing the. As shown in FIG. 3, a pin 14 is fixed to the lock lever shaft 5 so as to penetrate therethrough, and a projecting portion of the pin 14 of the lock member 7 a wound around the lock lever shaft 5. It projects into a slot 15 cut at the base end.

A hanging piece 2 is fixed to the lower portion of the lower rail 1, and a plurality of lock holes 3 are formed in the hanging piece.
Movable lock member 7 hinged to the lock lever shaft 5
The a and 7b once project outward from the window 6 of the upper rail 4, are then bent downward, and are further bent inward, so that the lock teeth 10a and 10b provided at the free ends of the movable lock members 7a and 7b are locked. , A guide hole 12 provided in a lower portion of the upper rail 4, a lock hole 3 formed in the hanging piece 2, and a lower portion of the upper rail formed in a free end of a curved portion 11 which is bent upward in a U shape. The notch 13 is penetrated in this order. At this time, the movable lock member 7a,
The lock teeth 10 a and 10 b provided on at least one of the 7 b will be fitted into the lock hole 3.

A bracket 16a having an L-shaped cross section at a portion of the lock members 7a, 7b protruding to the outside of the upper rail 4,
16b is fixed, and an L-shaped bracket 17 is fixed to the lower portion of the upper rail 4 so as to project outward.

A tension coil spring 18 is stretched between the brackets 16a and 16b and the bracket 17.

Therefore, when the lock lever shaft 5 is rotated by the handle 5a in the clockwise direction in FIG. 3, the pin 14 fixed to the lock lever shaft 5 is inserted into the slots 15 formed in the lock members 7a and 7b. When the lock members 7a and 7b are brought into contact with the end edges, the tension coil spring 1
It will rotate clockwise against the spring force of 8. What should be noted here is that when the lock teeth 10a, 10b provided on either of the guide members 7a, 7b cannot penetrate into the lock hole 3, the lock lever shaft 5 moves to the third position.
Even after returning to the position shown in the figure, such a guide member 7a or 7b has a corresponding tension coil spring 18
Can stay in the extended state.

FIGS. 4a to 4d are explanatory views schematically showing the positional relationship between the lock teeth and the lock holes in the embodiment shown in FIGS. 1 to 3.

The lock holes 3 are provided at equal intervals with a constant pitch period P, and each lock hole has a width a.

On the other hand, the movable lock members 7a and 7b are provided at a pitch z = P / 2 in the axial direction. Each movable locking member 7a, 7b has one lock tooth 10a, 1
0b is projected at the same phase position, and each lock tooth has a width x
have. Therefore, the pitch of the lock teeth 10a and 10b is also z = P / 2. In the present embodiment, the lock teeth 10a, 10b are provided at the central portions of the corresponding lock members 7a, 7b, but at the same phase position, the right end, the left end, etc. of each lock member can be set arbitrarily. It may be provided at a position.

Lock teeth 10a, 10b are 1/2 with respect to lock hole 3
Are provided at a pitch of, that is, P = 2z (1) and at the same time z + x <a (-a <-xz) ... (2) Due to the defined tooth width x, it may be possible for two locking teeth to project into the same locking hole, as best shown in FIG. 4b.

Regarding the width Pa of the portion between the lock holes, (1) and
From the formula (2), P−a = 2z−a <z−x (3), and as shown in FIG. 4d, the width P−a of the portion between the lock holes is equal to that of two adjacent teeth. Since it is smaller than the gap z-x between them, there is a case where both the lock teeth can protrude into different lock holes by making the portion between the lock holes protrude between the lock teeth.

Thus, as shown in Figures 4a to 4d,
When one of the lock teeth is in contact with the portion between the lock holes, the other tooth protrudes into the lock hole and locks at least one of the movable lock members regardless of the axial position of the movable lock member. The teeth can penetrate into the lock hole.

Figures 5a to 5f show three locking members 7a, 7b,
7c has one lock tooth 10a, 10b, 10
In the same manner as described above, the lock holes 3 are provided at equal intervals with a constant pitch period P, and each lock hole has a width a. There is. Further, similarly to the above, each movable lock member 7a, 7
b and 7c are arranged at the pitch z, and 1 for each.
Individual lock teeth 10a, 10b, 10c are provided at the same phase position, and each lock tooth has a width x.

Here, the pitch z of the movable lock members 7a, 7b, 7c in the axial direction is selected to be P = 3z / 2 (4). Therefore, the lock teeth 10a,
Since 10b and 10c are provided at the same phase position, the pitch of the lock teeth 10a, 10b and 10c is also z. Also in this embodiment, the lock teeth 10a, 10b,
10c is provided at the central portion of the corresponding lock members 7a, 7b, 7c, but may be provided at any position such as the right end and the left end of each lock member as long as they are in the same phase position.

Further, the width a of the lock hole 3 and the width x of the lock tooth are determined so that (z / 2) + x <a, that is, (z / 2) −a <−x (5).

Therefore, P−a = (3z−2) −a <z−x (6), and as shown in FIG. Since the gap zx between the teeth is large, there is a case where adjacent lock teeth can rush into different lock holes by causing the portion between the lock holes to poke between the lock teeth.

Also, as shown in FIG. 5d, looking at the conditions under which the lock teeth of the front and rear lock members can protrude into different adjacent lock holes, from the same equations (4) and (5), P + a = (3z / 2) + a> 2z + x (7), which means that it is possible.

Therefore, as shown in FIGS. 5a to 5f, when the lock teeth of any one or two movable lock members are in contact with the portion between the lock holes, the remaining movable lock members are The teeth of the movable lock member can protrude into the lock hole, and the lock teeth of at least one of the movable lock members can protrude into the lock hole regardless of the axial position of the movable lock member.

To generally extend the above concept, consider the case where n movable locking members are provided and each locking member is provided with one locking tooth in phase with each locking member ( (Fig. 6). In this case, similarly to the above, the pitch of the lock holes is P, the pitch of the movable lock members is z, the width of the lock teeth is x, and the width of the lock holes is a.

At this time, P = nz / (n-1) (8) {z / (n-1)} + x <a That is, -a <-x- {z / (n-1)} (9) Then, the condition under which the portion between the two adjacent lock holes can penetrate into the space between the two adjacent lock teeth (see FIG. 6b) is: Pa− {nz / (n−1 )}-A <{nz / (n-1)}-{z / (n-1)}-x = zx ... (10) It turns out that such a condition is satisfied.

Next, examining the condition that the outer dimensions (n-1) z + x of the n teeth fall within the width (n-2) P + a between the outer ends of the n-1 lock holes (see FIG. 6c), {(N-2) P} + a = {n (n-2) z / (n-1)} + a> {n (n-2) z / (n-1)} + {z / (n-1) )} + X = (n-1) z + x (11), and it can be seen that this condition is also satisfied.

In an intermediate state when these two conditions are satisfied, one of the lock teeth is always aligned with the lock hole due to the vernier principle used for calipers and the like.
In any case, it will be seen that at least one locking tooth can project into the locking hole.

7a and 7b show a modification of the above embodiment, in which each movable locking member is formed with a plurality of locking teeth. In the case of the embodiment shown in FIG. 7a, three movable lock members are used, and each lock member is provided with two lock teeth. In the embodiment shown in FIG. 7b, four lock teeth are provided. A movable lock member is used, and each lock member is provided with three lock teeth.

The pitch of the lock teeth provided on each lock member is equal to the pitch of the lock holes. Therefore, in this case, the lock teeth provided on each lock member simultaneously protrude into the lock hole respectively, but the cycle of the lock hole and the cycle of the lock member are deviated from each other, Similar to the embodiment, regardless of the position of the movable lock member in the axial direction, the lock teeth of at least one of the movable lock members can project into the lock hole.

To generally extend the above concept, consider the case where n movable locking members are provided and each locking member is provided with m locking teeth in phase with each locking member. In this case, similarly to the above, the pitch of the lock holes is P, the pitch of the movable lock members is z, the width of the lock teeth is x, and the width of the lock holes is a. The lock teeth provided on each lock member are divided into m pieces, and the lock teeth of each lock member are provided at a pitch P.

Here, the pitch z of the movable lock member is selected such that P = nz / m (n-1) (13), and {{n-m) z / m (n-1)} + x < a and x are selected so that a ... (14) (where m, n = 2, 3, ...).

Here, the conditions under which two lock teeth located at the front and rear ends of the adjacent movable lock members and adjacent to each other can fit into the same lock hole (Fig. 8a) are as follows: z- (m- 1) P + x = z- {n (m-1) z / m (n-1)} + x = {(nm) z / m (n-1)} + x <a (15), which is satisfied. I understand that.

Next, the distance between the inner ends of the lock teeth located at the outermost ends is greater than the distance between the inner ends of the outermost ends of the m (n-1) consecutive lock holes. When examining a large condition, m (n-1) P-a <(n-1) z-x + (m-1) P (16) That is, m (n-1) P- (n-1) z + x When-(m-1) P <a is examined, the left side = nz-nz + z + x- {n (m-1) z / m (n-1)} = {(nm) z / m (n-1) } + X <a = right side, and it is understood that this condition is also satisfied, and both of these two conditions are satisfied.

Also in the case of this embodiment, when the lock teeth of any one or two lock members are in contact with the portion between the lock holes, the remaining teeth are in the lock hole in the same manner as in the above embodiment. At least any one of the lock teeth can rush into the lock hole regardless of the axial position of the movable lock member. However, in this case, each lock member is provided with m lock teeth, and when they are inserted into the lock holes, they are always inserted into the adjacent lock holes.

Here, the number of lock teeth that can be provided on each lock member will be considered. From equation (14), Here, the right side must be positive, so that n> m, and a−x corresponds to the maximum value of the play between the lock hole and the lock tooth, so n = m + 1, that is, m = N-1 (18) and it is understood that the play can be reduced by increasing n as much as possible.

If (m-1) P + x = z (19), both ends of the lock member are aligned with the outermost ends of the lock teeth, as in the embodiment shown in FIG. 7b. , Can maximize the width of the lock tooth and maximize its strength.

INDUSTRIAL APPLICABILITY The present invention can be used as a lock structure for a normal seat slide device. In particular, when two seat slide devices for each seat are used and a lock structure interlocking with each of these slide devices is provided, By configuring the lock structure according to the present invention, it is preferable in that the possibility of incomplete engagement of the lock can be eliminated even when diagonal distortion occurs between both seat slide devices.

Although specific embodiments of the present invention have been described above, the present invention is not limited to the above. For example, it is also included in the concept of the present invention to reverse the dimensional relationship between the lock holes (portions between the lock holes) and the lock teeth.

<Effects of the Invention> According to the present invention, the lock teeth can be fitted into the lock hole at any seat slide position simply by dividing the lock member into a plurality of parts and attaching them to the lock lever shaft. Eliminates the need to fine tune the seat back and forth when changing. Especially when the present invention is applied to one of two seat slide devices used for one seat, even if a relative change due to diagonal distortion occurs between the two seat slide devices, the two seat slide devices are always locked. Since the mechanism can be reliably engaged, some diagonal distortion can be tolerated,
A great effect can be achieved in reducing the weight of the seat slide device.

[Brief description of drawings]

FIG. 1 is a side view showing a seat slide device to which the present invention is applied. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 4a to 4d are explanatory views conceptually showing the operation of the lock structure according to the present invention using two lock members. 5a to 5f are explanatory views conceptually showing the action of the lock structure according to the present invention using three lock members. 6a to 6c are explanatory views conceptually showing a locking device according to the present invention when n locking members are used. 7a and 7b are explanatory views conceptually showing a locking device according to the present invention in the case where each movable locking member is provided with a plurality of locking teeth. Figures 8a and 8b show an n with m locking teeth each
It is explanatory drawing which shows notionally the locking device based on this invention at the time of using one locking member. 1 ... Lower rail, 2 ... Hanging piece 3 ... Lock hole, 4 ... Upper rail 5 ... Lock lever shaft 5a ... Handle, 6 ... Window 7a, 7b, 7c ... Lock member 8 ... Holding member, 9 ... Sliding member 10a, 10b, 10c ... Lock tooth 11 ... Curved portion, 12 ... Guide hole 13 ... Notch portion, 14 ... Pin 15 ... Slot 16a, 16b, 17a, 17b ... Bracket 18 ... Tension coil spring

Claims (4)

[Claims] 1. A lock structure for a seat slide device having a first rail and a second rail which are parallel to each other in an axial direction and are slidable with respect to each other, the lock structure being provided on a side of the first rail. A plurality of lock holes formed at equal intervals along the axial direction at a pitch P, and a plurality of lock holes that are individually tiltable around the axial line and at equal intervals at a pitch z along the axial direction. N movable lock members hinged to the rail side, and one lock tooth formed at the same phase position of each lock member so that it can be engaged with and disengaged from the lock hole, When the width of the lock tooth is x and the width of the lock hole is a, P = nz / (n-1) and {z / (n-1)} + x <a (where n = 2, 3 , ...) as a lock structure. 2. A lock structure for a seat slide device having a first rail and a second rail which are parallel to each other in an axial direction and are slidable with respect to each other, the lock structure being provided on the side of the first rail. A plurality of lock holes formed at equal intervals along the axial direction at a pitch P, and a plurality of lock holes that are individually tiltable around the axial line and at equal intervals at a pitch z along the axial direction. N movable lock members hinged to the rail side, and each lock member have the same phase position and a pitch P in the lock members so that they can be engaged and disengaged with the lock holes. As described above, when the width of the lock tooth is x and the width of the lock hole is a, P = nz / m (n-1) and {(N−m) z / m (n−1)} + x <a (where n = 2, 3 ..., m = 2, 3, ...
m) is a lock structure. 3. The lock structure according to claim 2, wherein m = n-1. 4. The lock structure according to claim 2 or 3, wherein (m-1) P + x = z.