JPS6223644Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat suspension system used primarily in agricultural tractors.

Conventionally, in seat suspension systems for agricultural tractors,
Attach a bracket to an appropriate body part such as a hydraulic lift, and attach the lower surface of the front side of the seat to the upper end of this bracket in such a way that the mounting position in the front and rear can be changed.The rear side of the seat is also attached to the bracket, etc. There is a system in which the lower end of the spring is attached to a seat supported by the spring, and the lower surface of the seat is placed on the upper surface of the spring for support. however,
In such a structure, the seat pan on the underside of the seat directly contacts the spring, which has the disadvantage that the seat pan may be damaged due to friction between the two.

Furthermore, due to their structure, springs have a high ability to follow vertical vibrations, but have poor responsiveness to horizontal vibrations, and also have a small buffering capacity.
Therefore, there was a problem in that it was not possible to prevent the seat from rolling sideways.

The present invention aims to eliminate these drawbacks, improve the durability of the seat pan, and supplement the function of the spring, which is weak against lateral sway, to prevent the seat from swaying. A pillar-shaped buffer rubber 10 is fixed to the upper part of the installation seat 9, and the lower end of the seat spring 13 fitted onto the cushion rubber 10 is attached to the installation seat 9.
A generally annular wear-resistant elastic body 14 is attached to the upper end of the seat spring 13 so as to cover it, and the upper surface of the wear-resistant elastic body 14 is in contact with the lower surface of the seat 5 to support the seat 5. The cushioning rubber 10 is characterized in that an engagement portion 17 that fits into the engagement hole 18 formed in the wear-resistant elastic body 14 is provided at the upper end of the buffer rubber 10, and is configured to fit into the engagement hole 18.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below based on a drawing showing an embodiment of the present invention implemented in an agricultural tractor.

In the figure, 1 indicated by a two-dot chain line is a hydraulic lift that is placed on the rear axle case at the rear of the tractor and forms part of the machine body.There are front side seat brackets 2 on both left and right sides of this hydraulic lift 1. The lower end is attached. The upper end of the front seat bracket 2 is inclined diagonally forward, and a support pin 3 is provided between the left and right seat brackets 2. 4
is a mounting plate attached to both the left and right lower surfaces of the front side of the seat 5. Support holes 6 are bored at intervals in the front and rear, and the pins 3 are inserted into the support holes 6.
It supports the front side of the seat 5, and the front and rear positions can be changed by appropriately selecting the support hole 6 into which the pin 3 is inserted.

On the other hand, at the lower end of the seat bracket 2,
The lower end of each rear seat bracket 7 is attached, and the upper end of the rear seat bracket 7 is tilted diagonally rearward, protrudes upward, and is further bent forward to have a horizontal attachment piece 8. 9 is a cylindrical nylon installation seat; 10 is a cylindrical buffer rubber placed on the top surface of the installation seat 9;
has a circular recess 11 on its upper surface, and a bolt 12 inserted into this recess 11 from above is passed through the cushioning rubber 10 and the installation seat 9, and its lower end is screwed into the horizontal mounting piece 8, so that both is tightened and fixed. Thus, 13 is a seat spring whose lower end is fitted onto the installation seat 9, and 14
is a wear-resistant elastic body formed of polyurethane resin or the like in a generally annular shape, and the elastic body 14 has an annular recess 15 on its lower surface, and the spring 1
The upper end of the seat 3 is press-fitted into the annular recess 15 and fixed, and the upper surface of the wear-resistant elastic body 14 is supported by contacting the lower surface of the rear side of the seat 5. In this way, the seat spring 13 comes into contact with the lower surface of the seat 5 via the wear-resistant elastic body 14 attached to cover the upper end of the seat spring 13.
Even if the upper end swings, the wear-resistant elastic body 14 will move together with it. still,
The outer side of the wear-resistant elastic body 14 than the concave portion 15 extends downward to form a skirt portion 16 .
On the other hand, on the outer peripheral surface of the upper end of the buffer rubber 10, an annular recess 17 serving as an engaging portion of the present invention is formed over the entire circumference. This annular recess 17 is formed by a wear-resistant elastic body 14 disposed above the buffer rubber 10.
It is formed in a size that fits the engagement hole 18 in the inner circumference. That is, when the passenger is sitting on the seat 5, the seat 5 is
The upper end of the buffer rubber 10 slightly enters into the engagement hole 18 and engages with it. Therefore, the wear-resistant elastic body 14
can move relatively freely in the vertical direction along the outer periphery of the cushioning rubber 10, and normal vertical vibrations are relaxed and absorbed by the expansion of the seat spring 13. If the aircraft shakes up and down significantly, the upper end of the cushioning rubber 10 will be
This cushioning rubber 10 comes into contact with the lower surface and shares the load acting on the seat spring 13 to soften sudden impacts. Therefore, the rigidity of the seat spring 13 itself can be set to be soft. On the other hand, when the aircraft body rolls horizontally, the lateral movement of the seat spring 13 is regulated by the buffer rubber 10 due to the engagement between the buffer rubber 10 and the wear-resistant elastic body 14. Become,
A large lateral movement of the seat 15 is prevented.

The present invention has the above-mentioned structure, and a substantially annular wear-resistant elastic body is attached to the upper end of the seat spring so as to cover it, and the upper surface of this wear-resistant elastic body is brought into contact with the lower surface of the seat. Since it supports the seat, unlike conventional springs that are applied directly, the seat pan is reliably protected by this elastic body, which prevents early damage to the seat pan. It has become. Moreover, an engaging portion is provided at the upper end of the buffer rubber to fit into the engagement hole formed in the wear-resistant elastic body attached to the upper end of the seat spring fitted onto the buffer rubber. As a result of this structure, normal vertical vibrations are relaxed and absorbed by the expansion of the seat springs, and when the aircraft shakes significantly up and down, the shock absorbing rubber shares the load acting on the seat springs, causing sudden vibrations. At the same time, the lateral movement of the seat spring is regulated by cushioning rubber against the roll of the aircraft.
It prevents the seat from swaying and follows up and down sway well, but it has poor response to lateral sway.
The function of the seat spring, which has a small cushioning capacity, is complemented by the cushioning rubber, and it now exhibits an excellent cushioning effect not only against vertical vibrations but also against lateral vibrations.

[Brief explanation of the drawing]

The drawing is a partially vertical front view of an embodiment of the present invention. 5... Seat, 9... Installation seat, 10... Buffer rubber, 13... Seat spring, 14... Wear-resistant elastic body, 17... Annular recess (engaging portion), 18...
...Engagement hole.

Claims (1)

[Scope of utility model registration request] A pillar-shaped buffer rubber is fixed to the upper part of the installation seat, and the lower end of the seat spring fitted onto the cushion rubber is attached to the installation seat, and the upper end of this seat spring is covered with a substantially annular wear-resistant elastic body. The upper surface of the wear-resistant elastic body is in contact with the lower surface of the seat to support the seat, while the upper end of the cushioning rubber fits into the engagement hole formed in the wear-resistant elastic body. What is claimed is: 1. A seat suspension device, comprising: an engaging portion configured to fit into the engaging hole.