JPH0515155Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a weight adjustment device for a seat suspension that supports a seat installed in a vehicle such as an automobile, a tractor, or a self-propelled power shovel.

``Prior Art'' Up until now, seat weight adjustment devices have been configured to connect the upper frame of the seat suspension with a single tension spring, and to expand and contract the length of this tension spring. . In order to adjust the length of this spring, a screw device was used to rotate a feed screw with a knob.

``The problem that the invention aims to solve'' For this reason, in order to expand and contract the spring to the desired length, the knob must be rotated dozens of times.
The drawback was that it took time to adjust the weight.

Furthermore, using one long tension spring increases the overall structure, and if multiple tension springs are installed in parallel, there is a risk of interference with other components of the seat suspension. However, in order to avoid this problem, the structure has to be complicated.

"Means for Solving the Problems" Therefore, the purpose of this invention is to eliminate the above-mentioned drawbacks and provide a compact device that allows desired weight adjustment in a short time. The outline is as follows.

This is used for a seat suspension constructed by connecting the upper and lower frames with an X-shaped link. Attach each to the receiving plate.

The feed screw, which is pivoted and hangs down from the upper frame to which the seat is attached, is screwed into a nut fixed to the spring receiving plate.

Further, a rotating means is provided for rotating the feed screw to raise and lower the spring receiving plate.

"Operation" When the feed screw is rotated by the rotation means, the spring receiving plate is raised and lowered by the nut screwed into the feed screw. Therefore, the desired weight can be adjusted by slightly changing the height of the compression spring section made up of a plurality of coil springs. That is, the weight can be adjusted with a small number of rotations of the rotating means.

``Effects'' Since the compression spring part is formed of a plurality of coil springs, weight can be adjusted in a short time by simply rotating the knob attached to the rotating means a small number of times.

In addition, since the compression spring section has a plurality of coil springs arranged coaxially, the height of the compression spring section can be kept low, and there is no risk of interference with other components of the seat suspension. The entire device can be made compact.

``Example'' This invention will be described in detail below based on an illustrated example in which a gear device is used as the rotating means.

Reference numeral 1 designates a seat suspension, which is composed of a lower frame 2 that is attached to the floor of the vehicle, an upper frame 3 that attaches the seat, a pair of left and right X-shaped links 4 that connect both frames 2 and 3, and a damper (not shown). .

11 is a compression spring portion, and in the illustrated embodiment, a double coil spring is used. That is, the compression spring portion 11 is constituted by a small-diameter coil spring 11a and a large-diameter coil spring 11b disposed coaxially with the small-diameter coil spring 11a. Of course, it is also possible to arrange three or more coil springs coaxially.

Reference numeral 12 denotes a spring plate, which is attached to the lower frame 2 by attaching the lower end of the compression spring portion 11 via a mounting member 13.

14 is a spring receiving plate fixed to the upper frame 3, and is connected to the compression spring part 1 via a mounting member 15.
The upper end of 1 is attached. This spring receiving plate 14
A nut 16 is fixed at the center of the.

Reference numeral 17 is a feed screw whose upper end is pivotally supported by a support plate 18 fixed to the upper frame 3 and hangs down. For the nut 16 and the feed screw 17, those with a large pitch are used.

Numeral 19 denotes a driven gear, which is fixed to the upper end of the feed screw 17 on the support plate 18. Numeral 20 denotes a driving gear, which is fixed to a bracket 21 on the upper frame 3.
The gears 19 and 20 are fixed to the tip of an adjustment shaft 22 which is pivotally supported by the gear 20, and mesh with the driven gear 19 with their rotation axes perpendicular to each other (see FIG. 2).
Both use large pitch and large diameter.
With a small rotation of the knob 23 fixed to the rear end of the adjustment shaft together with the nut 16 and the feed screw 17,
The nut 16 can be raised and lowered greatly, so that the height of the compression spring portion 11 can be greatly expanded or contracted.

Here, the driven gear 19, the main drive gear 20, the adjustment shaft 22, and the knob 23 constitute a means for rotating the feed screw 17.

Although not shown, a ratchet device equipped with the driven gear 19 can also be used as this rotating means. Similarly, it is also possible to configure the rotation means by the driven gear 19 and a motor having a toothed small gear. As this motor, it is preferable to use a motor similar to the motor that adjusts the longitudinal position of the seat.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of an embodiment using a gear device as the rotating means, Fig. 2 is a plan view showing a state in which the driving gear and the driven gear mesh, and Fig. 3 is a schematic side view of the seat suspension. . 1...Suspension, 2...Lower frame, 3
...Top frame, 4...X-shaped link, 11...
Compression spring part, 14... Spring receiving plate, 16... Nut, 17... Feed screw, 19... Driven gear, 20
...Main gear, 22...Adjustment shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a seat suspension in which upper and lower frames are connected by an The parts are respectively attached to the spring receiving plate, and the feed screw, which is pivotally supported by the upper frame and hangs down, is screwed into a nut fixed to the spring receiving plate. A weight adjustment device in the seat suspension provided. 2. Claim 1, wherein the compression spring portion is a double coil spring.
Weight adjustment device in the seat suspension described. 3. The rotating means according to claim 1 or 2, wherein the rotating means is composed of a driven gear fixed to the feed screw, and a main driving gear fixed to an adjustment shaft pivotally supported on the upper frame and meshing with the driven gear. Weight adjustment device for seat suspension. 4. The weight adjustment device for a seat suspension according to claim 1 or 2, wherein the rotating means is a latch device including a driven gear. 5. The weight adjustment device in a seat suspension according to claim 1 or 2, wherein the rotating means comprises a driven gear fixed to the feed screw and a motor that drives a main gear gear meshing with the driven gear.