JP2002160572A - Weight adjusting device used for seat suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent dust and an operation failure which is caused by biting the dust in a screw mechanism. SOLUTION: This device contains a front dust boot 14 whose front end is fixed to a bearing 18 and rear end is fixed to a spring bracket in a sealed state, and a rear dust boot 15 which is arranged between a nut 12 and the rear end of an adjusting screw rod 11 and around the screw rod 11, and whose front end is fixed to the nut 12 and rear end is fixed to the rear end of the adjusting screw rod 11 in a sealed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight adjusting device used for seat suspensions of ordinary trucks, special trucks and special purpose vehicles.

[0002]

2. Description of the Related Art Modern bulldozers tend to use a weight control device for a seat, but when the bulldozer is operated in a very bad environment, for example, in a desert, dust comes into a cabin and the weight of the bulldozer is increased. There has been a problem that the adjustment device becomes heavy and malfunctions.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a weight adjusting device for use in a seat suspension which prevents dust and prevents a malfunction due to biting of dust into a screw mechanism.

[0004]

Means corresponding to the object and the operation thereof
An adjusting screw rod that protrudes from the front of the front of the lower frame of the seat suspension to be rotatably supported on the front of the lower frame by bearings, and that attaches an operation knob to the end of the adjusting screw rod; A nut that is movably supported on the adjusting screw rod and is supported by the nut in accordance with the operation knob side end surface of the nut, and the seat
A spring bracket that stops the front end of the suspension's spring, and is located around the adjusting screw rod between the bearing and the spring bracket, and a front end to the bearing and a rear end to the spring bracket, respectively. A front dust boot that seals off and is located around the adjusting screw rod between the nut and the rear end of the adjusting screw rod, and has a front end on the nut and a rear end on the adjusting screw. A rear dust boot that seals off at the rear end of the rod, respectively, and that the front screw boot and the rear dust boot prevent biting of dust into the adjusting screw rod and nut. Ensure smooth operation.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given of a weight adjusting device used in a seat suspension of the present invention based on a specific example shown and shown in FIG. 10 shows a specific example 10 of the weight adjusting device used in the seat suspension of the present invention, and the seat suspension 30 includes a lower frame 31 mounted on a cabin floor (not shown), a seat (not shown). Upper frame (not shown) for fixedly mounting an upper frame (not shown), left and right X-shaped links (not shown) for supporting the upper frame on the lower frame 31 so as to be vertically movable, and left and right suspensions. -Assembled from springs 33, 33, shock absorbers (not shown), etc., and according to the driver's weight And adjust the tension of the suspension springs 33 and 33 in the weight control apparatus 10 always takes a structure where kept constant sheet supporting height.

In the weight adjusting device 10, the adjusting screw rod 11 protrudes from the front end of the seat suspension 30 to the front 32 of the lower frame 31, and is rotated by the bearing 18 to the front 32 of the lower frame 31. Supported, and has an operating knob 17 mounted at its tip, and a nut 12 coupled to the lead screw 16 of the adjusting screw rod 11 and movably supported on the adjusting screw rod 11. , And the spring bracket 13
Are welded to the nut 12 so as to match the operation knob side end surface of the nut 12, and the left and right suspension springs 33 of the seat suspension 30,
33, and a front dust boot 14 is further disposed about the adjusting screw rod 11 between the bearing 18 and the spring bracket 13 and the front end is connected to the bearing 18.
Then, the rear end is sealed to the spring bracket 13 respectively, and further, the rear dust boot 15
Is the nut 12 and the adjusting screw rod 11
Between the rear end of the adjusting screw rod 11 and sealingly fastens the front end to the nut 12 and the rear end to the rear end of the adjusting screw rod 11, respectively.

The spring bracket 13 is formed into a groove beam having a predetermined length in cross section, and the left and right nipples 19, 19 are preliminarily formed with spring stopper holes (not shown).
After welding, the beam is welded to both ends. The spring bracket 13 has nipples 19, 19 on its left and right.
Corresponding suspension springs 33, 33
The front ends of the suspension springs 33, 33 are supported by hooking the front ends of the front and rear suspension springs 33, 33 into the spring stopper holes.

The front dust boot 14 is formed as a rubber boot in which a flange 21 is integrated with the rear end of a bellows 20 having both ends opened, and a resin clip (shown in FIG. ), While the flange 21 is screwed tightly to the spring bracket 13 to protect the adjusting screw rod 11 and nut 12 from dust.

The rear dust boot 15 is formed as a rubber bellows having both ends opened, and the front end is covered with the nut 12 and is sealed with a resin clip (not shown). With the rear end closed with a disk 22, the rear end of the adjusting screw rod 11 is sealed to the rear end of the adjusting screw rod 11 with a snap pin 23, and the adjusting screw rod 11 and the nut 12 are removed from dust.
To protect.

Therefore, when the bulldozer is operated with dust, the adjusting screw rod 11 and the nut 12 are hermetically protected by the front dust boot 14 and the rear dust boot 15 so that the dust is trapped. And smooth operation of the weight adjustment device 10 is ensured without the operation becoming heavy. As a result, the seat is
The tension of 3, 33 is smoothly adjusted by the weight adjusting device 10 according to the weight of the driver, and is always maintained at a constant support height.

The weight adjusting device 10 is disposed on the lower frame 31 of the seat suspension 30, but the suspension springs 30, 30 are provided.
Can be arranged on the upper frame according to the position of the upper frame.

As will be apparent from the specific embodiments of the present invention described above with reference to the drawings, the contents of the present invention will be apparent to those of ordinary skill in the art to which the present invention pertains. , The nature of the invention (nat
ure) and essence (substance)
Then, they are easily embodied in another mode that is objectively recognized as including them. Of course, the content of this invention is
According to the subject of the invention (be commensura
te with), and is essential for the establishment of the invention.

[0013]

As will be understood from the above, the weight adjusting device used in the seat suspension of the present invention is:
An adjusting screw rod that protrudes from the front of the front of the lower frame of the seat suspension to be rotatably supported on the front of the lower frame by bearings, and that attaches an operation knob to the end of the adjusting screw rod; A nut that is movably supported on the adjusting screw rod and is supported on the nut in accordance with the operation knob side end face of the nut, and the seat
A spring bracket that stops the front end of the suspension's spring, and is located around the adjusting screw rod between the bearing and the spring bracket, and a front end to the bearing and a rear end to the spring bracket, respectively. A front dust boot that seals off and is located around the adjusting screw rod between the nut and the rear end of the adjusting screw rod, and has a front end on the nut and a rear end on the adjusting screw. Since the rear end of the rod includes a rear dust boot which is closed in a sealed state, the weight adjusting device used for the seat suspension of the present invention has the adjusting screw rod and the nut fixed to the front dust boot. And sealed with rear dust boot And the screw mechanism is protected from malfunctioning due to the biting of dust, that is, the operation is not heavy and a smooth adjusting operation is ensured. , Sheet
Very useful and practical for suspension.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a specific example of a weight adjusting device used for a seat suspension of the present invention, which is used for a seat suspension of a bulldozer.

[Explanation of symbols]

 11 Adjusting screw rod 12 Nut 13 Spring bracket 14 Front dust boot 15 Rear dust boot 17 Operating knob 18 Bearing

Claims (1)

[Claims] 1. An adjusting screw for projecting a tip to a front of a lower frame of a seat suspension and rotatably supported by a bearing at the front of the lower frame, and attaching an operation knob to the tip.
A rod, a nut coupled to the lead screw of the adjusting screw rod and movably supported on the adjusting screw rod, and fixedly supported by the nut in accordance with an end surface of the nut on the operation knob side; And a spring bracket for stopping the front end of the spring of the seat suspension and the adjusting screw between the bearing and the spring bracket.
A front dust boot which is positioned around the rod and hermetically secures the front end to the bearing and the rear end to the spring bracket, respectively, between the nut and the rear end of the adjusting screw rod A rear dust seal arranged around the adjusting screw rod and sealingly sealing the front end to the nut and the rear end to the rear end of the adjusting screw rod
Weight adjustment device used for seat suspension including boots.