JPH01240331A - Device for locking power seat of vehicle - Google Patents

Abstract

PURPOSE:To contrive to make a device small in size, low in cost and so on by providing an actuator moving a lock lever to be engaged in a lock plate while overcoming a spring and the like so that a geared type locking mechanism can be employed. CONSTITUTION:The lock lever 23 of a locking device 20 is usually engaged in the recess section 21a of a lock plate 21 by a spring 25 so as to be locked. On the other hand, when a slide is adjusted, an actuator 24 allows the lock lever 23 to be engaged with and/or disengaged from while overcoming the spring 28, and a slide driving device 10 also allows a seat cushion te be forwarded and/or reversed concurrently. And when the operations have come to an end, if the lock lever 23 is found to have not been engaged in this permits No.2 position sensor 26 to detect the situation so that the slide driving device 10 is operated to the direction corresponding to the signal detected by No.1 position sensor 25. As a result, when the lock lever 23 is moved so as to be normally engaged in, this permits No.2 position sensor 26 to detect the situation so that the slide driving device 10 is suspended.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a pair of rail units consisting of a lower rail fixed to the floor side and an upper rail on the seat cushion side slidably engaged with the lower rail. This invention relates to a locking device for a power seat for a vehicle in a non-sliding state, which is provided on one side when a slide drive device is provided on the other side.

[Conventional technology]

This type of locking device is known from Japanese Patent Laid-Open No. 61-253234, in which rods arranged in parallel on the upper rail of the non-drive side rail unit are tightened using an elastic body, and when the slide drive device is activated, the elastic body is tightened by a solenoid. It is designed to be released.

[Problem to be solved by the invention]

However, a strong elastic body is required to obtain sufficient tightening force, and a correspondingly large solenoid with a large driving torque is required to release it. As a result, it becomes bulky, and there is a possibility that the seat cushion will feel like a foreign body.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a locking device of the type mentioned at the outset, which employs an interlocking locking device.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a locking device or
A lock plate (21) having teeth (21a, 21b) formed along the sliding direction on either the upper rail (2, 2a) or the floor side, and four parts (21a) of this lock plate provided on the other side. A lock lever (23) is biased by a spring (28) and movable between engagement and disengagement positions;
an actuator (24) that moves from the engaged position to the engaged/disengaged position against the bias during the sliding operation by 14);
The four parts (21a) on which side are in contact with the protrusion (21b) of the lock lever (23) or the lock plate (21)
), and a first position sensor (25) that detects whether the lock lever (23) is close to the convex part (21b) or the fourth part (21a).
) is located at the second position sensor (26).
), and after the slide operation of the switch (14) is completed, the second
The position sensor (26) is located in the recess (23) of the lock lever (23).
21a) to detect the entry into the slide drive device (1)
0).

[Effect]

In the normal state, the lock lever (23) engages and locks the four parts (21a) of the lock plate (21) by the spring bias. When adjusting the slide, use the switch (14)
The actuator (24) engages and disengages the lock lever (23) against the spring force, and the slide drive device (10) moves the seat cushion forward or backward.

If the lock lever (23) is not engaged when the operation is completed, the second position sensor (26) detects this and responds to the detection signal of the first position sensor (25). When the slide drive device (10) is operated in the opposite direction and the lock lever (23) moves and is properly engaged, the second position sensor (26) detects this and the slide drive device (10) is activated.
10) is stopped and locked.

(Embodiment of the Invention) FIGS. 1 to 3 show a power seat for a vehicle according to an embodiment of the present invention.

In Figure 2, the lower rail 1. fixed to the floor side.
1a, and an upper rail 2 fixed to the seat cushion side and slidably engaged with the lower rail 1.1a.
．． A pair of rail units consisting of 2a are arranged side by side.

The rail unit 1.2 on one side has a screw 12 arranged in parallel with the upper rail 2, and a bracket 1 attached to the lower rail l so as to mesh with the screw.
A slide drive device 10, which is well known in itself, is provided, which comprises a nut housed in a nut 3 and a motor 11 that rotates and drives the screw 12 by operating a switch 14 so as to slide the screw 12 between the stoppers 12a on both sides. As shown in FIG. 3, in order to rotate the motor 11 in the forward or reverse direction in accordance with the forward or backward suppressing operation of the seesaw-type switch 14, a relay 1 and K2 and transistors Trl and Tr2 are constructed. A motor drive circuit with an attached control circuit running behind the motor is provided.

On the other hand, the rail units 1a, 2a on the other side are provided with a locking device 20, which will be described in detail in FIG.

This locking device includes a locking plate 21 having tooth profiles of the same shape and pitch formed along the sliding direction on the floor side, and aligned with the upper rail 2a so as to engage the four parts 2]a of this locking plate. Bearing 22a
A lock lever 23 is fixed to the rod 22, which is rotatably supported by the rod 22 and biased in the engagement direction by a lever spring 28, and the lock lever is moved from the engagement position to the engagement and disengagement position against the biasing force of the spring. A rotary solenoid 24 is attached to the upper rail 2a to detect which side of the recess 21a the position where the lock lever 23 or the protrusion 21b of the lock plate 21 abuts is close to. and a limit switch 26 which is activated and turned on by the end bent portion 22b of the rod 22 in order to detect that the lock plate 2I is engaged or disengaged from the four portions 21a. There is.

Furthermore, as shown in FIG. 3, this locking device 20 includes power supply ties DI and D2 from the switch 14,
After the operation of the switch 14 is completed, the limit switch 26 is turned off in the direction according to the detection signal of the limit switch 25. In order to operate the motor 1, the charging circuit R1,
C1, OR gate OR1, OR3, transistor Tr3
Also attached is a control circuit consisting of a charging circuit R2, C2 OR gates OR2, OR4, and a transistor Tr4 having a similar parallel configuration.

The roller 25a at the tip of the actuator of the limit switch 25 is
It interlocks with the lock lever 23 along the convex portion 21b, and is set in a positional relationship with respect to this lever as shown in FIG. That is, as shown in FIG. 4, when the lock lever 23 is placed exactly at the center position of the convex portion 21b, the roller 25a is located at the edge of the adjacent convex portion 21b, and the roller 25a is positioned at the boundary of the switching operation. in position. Therefore, while the limit switch 25 is sliding in the forward direction toward the position shown in FIG. It comes off and switches to contact 25c. Conversely, while the limit switch 25 is sliding in the backward direction toward the position shown in FIG.

The operation will be explained with reference to FIG.

When the switch 14 is operated to the forward side, the rotary solenoid 24 is rotated through the tie auto D1, the lock lever 23 is engaged/disengaged, the limit switch 26 is turned on, and power is supplied to the relays 1 and K2. moreover,
Transistor T through OR gate ORI or OR2
By turning on r3 and Tr4, capacitor C
I and C2 are grounded, and control based on the detection signal of the limit switch 25 is not performed.

This causes the transistor T to pass through the OR gate OR3.
ri turns on, relay 1 turns on, motor 1
1 is rotated forward, that is, driven forward. Further, when the switch 14 is operated to the reverse side, the motor 11 is similarly driven in the reverse direction by the relay 2.

When the operation of these switches 14 ends, power is not supplied from the diodes DI and D2, the rotary linenoid 24 becomes inactive, and the charging circuits CI, R1, C2, and R
2 becomes ready for operation. When the lock lever 23 rests on the convex portion 21b at a position closer to a in FIG. 4 than it is in FIG. Power is being supplied to the relay with 1 and K2. As a result, the charging voltage of the capacitor C2 passes through OR3 to turn on the transistor Tri, thereby driving the motor 11 forward.

As a result, when the lock lever 23 falls into the recess 21a due to the biasing force of the spring, the limit switch 26 is turned off and driving of the motor 11 is interrupted, and the locked state is stabilized due to the biasing force of the spring.

During this operation, the capacitor C1 is grounded by the transistor Tr4, and reliable forward drive is guaranteed regardless of the delicate operation of the limit switch 25. On the other hand, if the lock lever 23 is located closer to C in Figure 4 than to the position shown in Figure 4 when the switch 14 is released, the limit switch 25 contacts the contact 25c, and the charging voltage of the capacitor C1 decreases. Tr2 is turned on through 0114, and 2 is passed through relay to drive the motor 11 backward.

Note that the present invention can be applied to a known lock plate, and the unevenness does not necessarily have to have the same size as long as it has the same pitch.

As the first position sensor, a rotary encoder that detects the amount of rotation of the screw may be used to estimate the lock lever position and a CPU may be used in the control circuit, or a lock lever with a different movable structure may be used, or a rotary encoder may be used. Various modifications can be made within the scope of the present invention, such as using a motor instead.

(Effects of the Invention) As described above, according to the present invention, it is possible to employ an interlocking locking mechanism using a spring-biased lever even for a power seat. This makes it possible to achieve smaller size, lighter weight, higher reliability, and lower cost, and there is no feeling of a foreign body when seated, and there is no restriction on the legroom of the rear seat. The engagement adjustment of the lock lever after the operation is completed is performed over the shortest distance, and only a slight deviation in the set position is required.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a power seat according to an embodiment of the present invention, Fig. 2 is a perspective view of the entire embodiment, Fig. 3 is an attached circuit diagram of the embodiment, and Fig. 4 is the same. Figures illustrating the operation of the embodiment and FIG. 5 are flowcharts illustrating the operation. 1.1a...Lower rail, 2.2a...Upper rail, ]0...Slide drive device, 11...Motor, 14...Switch, 20...Lock device, 2
1...Lock plate, 23...Lock lever-1
25, 26...Limit switch.

Claims (1)

[Claims] Of a pair of rail units consisting of a lower rail fixed to the floor side and an upper rail fixed to the seat cushion side and slidably engaged with the lower rail, the upper rail is automatically moved in response to a switch operation. A locking device for a power seat for a vehicle that is installed on the other side of the side provided with a slide drive device that slides in either the forward or backward direction, and that locks the upper rail when the slide drive device is not activated. a lock plate having a tooth profile formed along the sliding direction on one side; and a lock plate provided on the other side on the upper rail or floor side and biased by a spring so as to engage in a recess of the lock plate, and in an engaged/disengaged position. a lock lever that is movable between the lock levers; an actuator that moves the lock levers from the engagement position to the engagement and disengagement positions against the biasing force when a switch is operated to slide the lock levers; A first detecting device that detects which side of the recess the abutted position is closer to.
a second position sensor that detects whether the lock lever is located in the convex portion or the concave portion; and a second position sensor that detects whether the lock lever is located in the convex portion or the concave portion; A locking device for a power seat for a vehicle, comprising: a control circuit that operates the slide drive device until the second position sensor detects the engagement in the recess position.