JPH0645321B2 - 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 they cannot be engaged with each other, the lock engagement was possible only at the position where the lock teeth are aligned with the lock holes. Therefore,
When trying to engage the lock again after moving the seat back and forth, in many 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 (= 2,3,) hinged to the second rail side so as to be tiltable about an axis and equidistantly spaced at a pitch mP (m = 1, 2, ...) Along the axial direction. ...) formed on the movable lock member so that the movable lock member can be individually engaged with and disengaged from the lock hole, and the movable lock member has a phase difference with respect to its pitch period. When the width of the lock tooth is x and the width of the lock hole is a, P>a> x +
This is achieved by providing a locking structure characterized by being P / n.

<Operation> By determining the width of the lock tooth and the width of the lock hole as described above based on the pitch cycle of the lock hole, the lock tooth of at least one lock member is engaged with the lock hole at an arbitrary position. You can

<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 slidable body 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 the axis of the sliding member 9 substantially at the center thereof. A lock member 7 is provided on a portion of the lock lever shaft 5 which faces a window 6 cut on the upper rail 4.
A and 7b are hinged. 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 is a movable lock member 7 a wound around the lock lever shaft 5. , 7
It projects into the slot 15 cut at the base end of b.

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.
A lock member 7a hinged to the lock lever shaft 5,
7b once protrudes outward from the window 6 of the upper rail 4, is then bent downward, and is further bent inward, and is provided at the free ends of the lock members 7a, 7b and is provided with the lock teeth 10a,
Reference numeral 10b denotes 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 end of the upper rail cut at a free end of a curved portion 11 which is bent upward in a U shape. The notch 13 provided is penetrated in this order.

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. By contacting the end edges, the lock members 7a and 7b rotate clockwise against the spring force of the tension coil spring 18.
It should be noted here that when one of the lock teeth 10a, 10b of the lock members 7a, 7b cannot penetrate into the lock hole 3, the lock lever shaft 5 is at the position shown in FIG. That is, the guide member 7a or 7b can remain in the extended state of the corresponding tension coil spring 18 even after returning to the above state.

FIGS. 4a to 4d are explanatory views schematically showing the positional relationship between the lock teeth 10a and 10b and the lock hole 3 in the embodiment shown in FIGS. 1 to 3. Lock hole 3
Have a width a and are provided at equal intervals with a constant pitch period P. The lock members 7a and 7b are also aligned with the pitch period P, and each lock tooth has a width x. Further, the lock teeth 10a, 10b are respectively 18
It is provided so as to have a phase difference of 0 °, that is, at a position offset by P / 2. Further, a and x are defined so that P>a> x + P / 2 (1) and x <P / 2 (2).

Therefore, in the case as shown in FIG. 4b, the distance P + a between the outer ends of two adjacent lock holes and the adjacent two
Distance between the outer ends of the lock teeth 2P-P / 2 + x (= 3P
/ 2 + x), P + a-3P / 2-x = ax-P / 2, and using the formula (1), the above formula> 0, and the condition for fitting the lock teeth is satisfied. I understand.

Also, in the case as shown in FIG. 4d, the distance 2P-a between the inner ends of the two lock holes located on the left and right of one lock hole and the distance between the two adjacent lock teeth Examining the relationship with the distance (3P / 2) -x between the ends, if the same equation (1) is used, then 2P-a- (3P / 2) + x = -a + x + P / 2, and if the equation (1) is used, The above expression is <0, and it can be seen that the condition for fitting the lock teeth is satisfied.

From the above, it is understood that regardless of the positions of the lock teeth 10a and 10b, either one of the lock teeth 10a or 10b can be fitted into the lock hole 3 as shown in FIGS. 4a to 4b. . The expression (2) defines the conditions for enabling the lock teeth to be formed.

Figures 5a to 5f show one lock tooth 10a, 10
The case where three movable lock members having b and 10c are used is shown. The lock holes 3 each have a width a and are provided at equal intervals with a constant pitch period P. The locking members are also aligned with the pitch period P and each locking tooth has a width x. Further, lock teeth 10a, 10b, 10c
So that they have a phase difference of 120 ° with each other,
That is, they are provided at positions offset by P / 3.

In the case of this embodiment, a and x are set so that a> x + P / 3 (3) and P> x / 3 (4).

Therefore, in the case as shown in FIG. 5b, the distance P + a between the outer ends of two adjacent lock holes and the adjacent two
Distance P + P / 3 + x (= 4P /
3 + x), P + a-4P / 3−x = a−P / 3−x, and using equation (3), the above equation> 0, and the condition for fitting the lock teeth is satisfied. Understand.

Also, in the case as shown in FIG. 5f, the distance 3P-a between the inner ends of the two lock holes located on the left and right of the two adjacent lock holes and the two adjacent lock teeth Examining the relationship between the inner end distance of 2P-x4P / 3, that is, (4P / 3) -x, it becomes 3P-a- (4P / 3) + x = -a + x + P / 3, and using equation (3) The above expression is <0, and it can be seen that the condition for fitting the lock teeth is satisfied.

From the above, regardless of the positions of the lock teeth 10a, 10b, 10c, as shown in FIG. 5a to FIG.
It can be seen that b and 10c can be fitted into the lock hole 3. The expression (4) defines the conditions for enabling the lock teeth to be formed.

Generally expanding the above concept, as shown in FIGS. 6a and 6b, when using n movable locking members each having one locking tooth, the position of each locking tooth is P
By offsetting each / n, and setting P>a> x + P / n (5) and P> x / n (6), the relative positional relationship between the upper rail and the lower rail is proved below. Regardless of this, at least one of the lock teeth can be fitted.

That is, in the case as shown in FIG. 6a, the distance P + a between the outer ends of two adjacent lock holes and the distance P + P / n + x (= ( n +
1) When examining the relationship with P / n + x), P + a- (n + 1) P / n-x = a-x-P / n Therefore, using the formula (5), the above formula> 0, and the lock tooth is inserted. You can see that the conditions are met.

Further, in the case as shown in FIG. 6b, the distance nP-a between the inner ends of the two lock holes located on the left and right of the two adjacent lock holes and the two adjacent lock teeth. The distance between the inner ends of (n-1) P-x + (n-1) P / n, that is {(n
+1) P / n} -x When examined, the relationship is nP-a-{(n + 1) P / n} + x = -a + x + P / n Therefore, if equation (5) is also used, the above equation <0 and lock It can be seen that the conditions for fitting the teeth are satisfied. The expression (6) is a condition for avoiding a case where the lock tooth is physically impossible to form beyond the end portion of the lock member.

From this, regardless of the positions of the lock teeth 10a, 10b, 10c, at least one of the lock teeth 10a,
It can be seen that 10b and 10c can be fitted into the lock hole 3.

7a and 7b show the case where the pitch of the lock member is P in the above-mentioned embodiment, whereas the pitch of the lock member is P / n like the lock teeth.

Also in this case, as a critical condition, two adjacent lock teeth can protrude into the same hole (Fig. 7a), and the first and nth lock teeth can be inserted into the adjacent two lock holes, respectively. Examine whether it can rush (Fig. 7b).

In the case of FIG. 7a, a> P / n + x to a−x> P / n In the case of FIG. 7b, P−a <P−P / n−x to a−x> P / n, whichever is Also in the case, it is understood that the condition of Eq. (5) should be satisfied.

Also, as a condition that adjacent lock teeth do not interfere with each other
The condition of Eq. (6) is required.

However, the condition of the expression (6) can be eliminated as follows. That is, in the first embodiment, since the n-th locking tooth exceeds the end of the locking member, the width of the n-th locking member is set to d =, as shown in FIG. This disadvantage can be avoided by increasing x-P / n.

In the case of the second embodiment, in order to prevent the adjacent lock teeth from interfering with each other, the odd-numbered lock teeth and the even-numbered lock teeth are respectively pitched as shown in FIG. The condition of Eq. (6) can be eliminated by distributing in the range of 2p + d.

FIG. 10 is a graph showing a range of the width a of the lock hole and the width x of the lock tooth that satisfy the fitting condition of the lock tooth.
The relations of the above equations (5) and (6) and the range R such that a <P
If a and x are determined from the inside, the lock teeth can always be fitted into the lock hole regardless of the position of the lock member. Although there is (P / n) play between the lock teeth and the lock hole, this play can be reduced by increasing n. However, as described above, the condition of the expression (6) can be omitted in some cases.

To more generally extend the above concept, consider the use of n locking members, each having m locking teeth. As is clear from the case of m = 2 and n = 3 illustrated in FIG. 11, this is no different from using m sets of lock members in the case of m = 1. Can be applied.

INDUSTRIAL APPLICABILITY The present invention can be used as a lock structure for a normal seat slide device, and 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, one lock structure is provided. The configuration according to the present invention 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. It eliminates the need for fine adjustment of the seat back and forth when changing the. In particular, when the present invention is applied to one of two seat slide devices used for one seat, the two seat slide devices are always locked even if relative displacement due to diagonal distortion occurs between the two seat slide devices. Since the mechanism can be reliably engaged, a small amount of diagonal distortion can be tolerated, and 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. FIGS. 4a to 4d show 2 with one locking tooth each
It is explanatory drawing which shows notionally the effect | action of the lock structure based on this invention using two movable lock members. FIGS. 5a to 5f show 3 with one locking tooth each
It is explanatory drawing which shows notionally the effect | action of the lock structure based on this invention using two movable lock members. Figures 6a and 6b show n with each one locking tooth
It is explanatory drawing which shows notionally the effect | action of the lock structure based on this invention using the movable lock member of one piece. 7a and 7b are views similar to FIGS. 6a and 6b, which conceptually show the operation of the second embodiment of the present invention. FIG. 8 and FIG. 9 are explanatory views showing a special case of the condition for enabling the lock teeth to be formed. FIG. 10 is a graph showing appropriate ranges of values of a and x. FIG. 11 is an explanatory view conceptually showing the operation of the lock structure according to the present invention, which uses three movable lock members each having two lock teeth. 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 (1)

[Claims] 1. A lock structure for a seat slide device having a first rail and a second rail that are parallel to each other in an axial direction and are slidable with respect to each other, the axis being on the side of the first rail. A plurality of lock holes formed at equal intervals along the direction P, and a pitch mP (m = 1, 2) that is tiltable about the axis on the second rail side and along the axis. , N) of n (= 2, 3, ...) movable lock members that are hinged at equal intervals, and the movable locks so that they can be individually engaged with and disengaged from the lock holes. The member has m lock teeth formed so as to have a phase difference with respect to the pitch period, and when the width of the lock teeth is x and the width of the lock hole is a, P> A lock structure characterized in that a> x + P / n.