JPH0524582Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a height adjustment device for manually adjusting the height of a seat in an automobile, and more particularly to a seat height adjustment device equipped with a cam plate for driving parallel motion link means.

Such a seat height adjustment device (hereinafter simply referred to as the device) comprises, for example, a parallel motion link means and a seat drive means for applying an operating force to the link. The parallel movement link means includes a seat frame, a seat slide, a front swing link that connects the front sides of these two members, and a rear swing link that connects the rear sides of these members. The seat driving means consists of a cam plate and an adjustment lever fixed to the cam plate.The cam plate is fixed to a support shaft pivotally supported on the seat frame and is configured to be rotatable in the vertical direction. A cam groove is formed at an intermediate position of the swing link to engage a driven pin that projects laterally. Then, by rotating the adjustment lever, the cam groove pushes the driven pin, swings the swing link, and adjusts the height of the seat.
At each position of the seat, the shape of the cam groove in the cam plate, the position of the spindle, and the follower provided on the swing link are determined so that the swing link can be locked at the swing position corresponding to each position of the seat. The positions of the pins are set, and the sheet is stably held in each position.

However, this configuration does not give the operator a sense of moderation, so the problem is that even if the operator operates the adjustment lever, he or she always feels uneasy about whether or not he or she has turned the adjustment lever to the correct position. be.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a seat height adjustment device that has a parallel movement link means and a seat drive means and has a sense of moderation in operation.

Such an object comprises a parallel movement link means and a seat drive means having a cam plate, with as many holes projecting on the circumference about the spindle of the cam plate as the positions in which the seat is to be held. The seat height adjustment device is provided with an elastic plate whose base end is fixed to a member that pivots the support shaft and whose free end is formed with a protrusion so as to be able to engage with the hole. It will be achieved.

Hereinafter, a detailed explanation will be given with reference to illustrated embodiments.

In FIGS. 1 and 2, the parallel motion link means includes a seat frame 21, which is an upper mounting member, at the bottom of both sides of the seat (not shown), and a lower mounting member, which is slidably supported on rails 28 fixed to a vehicle body 27. A seat slide 29 as a member and a front swing link (hereinafter simply referred to as link) 23 in the longitudinal direction of the vehicle.
and a rear swing link (not shown). The distances between these longitudinal swing links and between the respective pivot points of the seat frame 21 and the seat slide 29 are set equal, so that the seat frame 21 moves up and down parallel to the seat slide 29. This is the same as before. A driven pin 34 is installed horizontally in the middle of the link 23, and is connected to the seat frame 21 via the pin 22, and connected to the seat slide 29 via the pin 3.
1, respectively. Cam plate 36
is fixed to a support shaft 37, and the support shaft 37 is pivotally supported by the seat frame 21 and the subframe 41. A bent cam groove 35 is bored in the cam plate 36. The cam groove 35 has an arc shape that surrounds approximately half the circumference of the support shaft 37, and has one end corresponding to the lowest position of the seat (position A). ) to the other end (position C) corresponding to the uppermost position of the sheet, the distance from the support shaft 37 increases. Specifically, a small convex arc is inserted approximately in the center of this concave arc to form a composite arc, and the position A in the middle of the cam groove 35 changing from concave to convex and the uppermost position of the sheet of the cam groove 35 At position B corresponding to , the tangent of the angle between the perpendicular direction of the cam groove 35 and the direction of the support shaft 37 is approximately 8 degrees or less, which is sufficiently smaller than the coefficient of friction (approximately 0.2). A driven pin 34 is inserted into this cam groove 35,
The seat height can be maintained at three positions, where the driven pin 34 is at the above-mentioned position A, and positions B and C by the action described later.

Holes 50, 51, and 52 are bored in the cam plate 36 on the circumference around the support shaft 37. These holes 50, 51 and 52 correspond to the position where the driven pin 34 abuts against the cam groove end A, the position B midway through the cam groove, and the position where the follower pin abuts against the cam groove end C, respectively.

The elastic plate 53 is made of, for example, a spring steel plate,
Its base end 53a is attached to the subframe 41 with a screw 54.
The free end 53b has a bifurcated shape and has a protrusion 55 at its base, which connects the holes 50 to 53.
52. Third
As clearly shown in the figure, the elastic plate 53 forms a bent portion 53c in the middle. The bifurcated free end portion 53b is shaped to surround approximately half the circumference of the support shaft 37, and is intended for convenience during assembly.
As clearly shown in FIG. 2, the elastic plate 53 has a tendency to always press the free end 53b against the cam plate 36, and has one of the holes 50 to 52 and the protrusion 5.
When the numbers 5 and 5 match, a part of the protrusion 55 projects into the hole.

The operation of this device will be explained.

FIG. 1 shows the seat in its lowest position. Now, if you grasp the adjustment lever 38 and lift it upward, the cam plate 36 will rotate clockwise in the figure around the support shaft 37, and as the cam plate 36 rotates, the driven pin 34 will move toward the cam. As the elastic plate protrusion 55 moves away from the groove end A and moves toward the position B, the elastic plate protrusion 55 slips out of the hole 50. If you continue to rotate,
The driven pin 34 reaches the B position as shown in FIG. 4, and the protrusion 55 enters the hole 51. This feeling of moderation is immediately transmitted to the operator, and if the position is satisfactory, the operator can immediately release his hand from the adjustment lever 38.

In FIG. 4, when a seat load is applied from the seat frame 21 to the link 23, the link 23 tries to rotate clockwise around the pin 22, but
Since the driven pin 34 on the link 23 abuts against a portion 35a of the cam groove 35, the link 23 is not allowed to rotate. Further, the force acting on the cam groove 35 that attempts to rotate the cam plate 36 in the counterclockwise direction is canceled out by the frictional force acting on the part 35a of the cam groove 35, and the rotation of the cam plate 36 is also prevented. , the seat height is maintained.

When the adjustment lever 38 is further pulled up, as shown in FIG. 5, the driven pin 34 reaches the C position and the protrusion 55 (FIG. 1) enters the hole 52, conveying the sense of moderation to the operator. Even when the driven pin 34 is placed in the position C of the cam groove 35, the same effect as described for the B position prevents the link 23 and the cam plate 36 from rotating, so the seat height is maintained. Ru.

In this example, the number of positions is three, but
Of course, this number may be arbitrary. Furthermore, the elastic plate need not be made of spring steel, but may of course be made of hard plastic.

As is clear from the above description, the seat height adjustment device according to the present invention has the effect of providing a sense of moderation to the operator with a simple configuration.

[Brief explanation of the drawing]

1 and 2 are a side view and a plan view of a seat height adjustment device showing an embodiment of the present invention,
Figure 3 is a perspective view of the elastic plate, Figure 4 is a side view of the seat height adjustment device with the seat at an intermediate height, and Figure 5 with the seat in its uppermost position. be. 21... Seat frame, 23... Front swing link, 29... Seat slide, 34... Follower pin, 35... Cam groove, 36... Cam plate, 37...
Support shaft, 38... Adjustment lever, 50, 51, 52...
...hole, 53...elastic plate, 55...protrusion.

Claims (1)

[Scope of utility model registration request] A seat height adjustment device comprising a parallel movement link means for vertically movably supporting the seat with respect to the vehicle body, and a seat drive means for vertically moving the seat, wherein the parallel motion link means is connected to the vehicle body side. The seat driving means includes a lower mounting member, an upper mounting member on the seat side, and a pair of swing links that connect these upper and lower mounting members at the front and rear in the longitudinal direction of the vehicle, and the seat driving means is provided with a horizontal support on the upper mounting member. a cam plate which is pivotally connected via a shaft and has a substantially arc-shaped cam groove surrounding approximately half the circumference of the support shaft; The cam groove includes a driven pin that projects into the cam groove and an adjustment lever that rotates the cam plate, and the cam groove extends from one end corresponding to the lowermost position of the sheet to the other end corresponding to the uppermost position of the sheet. Therefore, the distance from the support shaft is gradually increased, and the sheet is formed into a composite arc that is concave toward the support shaft and has a convex small arc inserted approximately in the center. The same number of holes as the positions in which the cam plate is to be held are bored on a circumference centered on the spindle of the cam plate, and the base end is fixed to the upper mounting member and the free end is engaged with the holes. A seat height adjustment device comprising an elastic plate with adjustable protrusions.