JPS6328651Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring suspension system for a seat with a parallelogram linkage.

Tractors used for farming, civil engineering, etc., which frequently travel on rough terrain, have severe vertical vibrations and have poor seating comfort, which increases driver fatigue.

The object of the present invention is to provide a spring suspension system for a compact seat to improve riding comfort.

Next, the present invention will be explained with reference to embodiments shown in the drawings.

As shown in the drawing, the spring suspension system is
It is attached to the bottom of seat 1. Seat mounting part 2
is constituted by a front side wall 5 and opposing side walls 3, 4 each having an elongated hole 6, 7. A bolt 14 is rotatably supported on the front side wall.

Reference numeral 13 denotes a load adjustment shaft, which is connected to the opposing side walls 3 and 4.
It engages with a horizontal elongated hole 6 punched in each, and its both ends penetrate through the elongated hole 6 and protrude to the outside of the opposing side walls 3 and 4. The load adjustment shaft 13 is threadedly engaged with the bolt 14 at its center, and can be slid back and forth along the elongated hole 6 by rotation of the bolt 14.

The parallel links 8 and 9 have their lower ends rotatably supported between the opposing side walls of the base 15 , and their upper ends rotatably supported between the opposing side walls 3 and 4 of the seat mounting portion 2. The seat is pivoted to form a parallelogram link mechanism that holds the seat horizontally and supports it freely up and down.

A lever 10 is integrally crank-shaped and protrudes from the upper end of one link 9 of the parallel links, and a shaft 11 is fixed to the other end, and is driven into the opposing side walls 3 and 4 of the seat mounting portion 2, respectively. Drawn long hole 7
The shaft 11 extends through the shaft 11 so that both ends of the shaft 11 protrude to the outside of the opposing side walls 3 and 4.

A spring 12 made of a coil spring or the like is provided at each end of the load adjustment shaft 13 and the shaft 11 that protrudes outward from the opposing side walls 3 and 4.
are respectively locked and elastically connected, and the side walls 3, 4
By installing the parallelogram link mechanism so as to be able to expand and contract along the axis, the parallelogram link mechanism is resiliently biased upward and provides suitable cushioning properties.

Numeral 16 is a slide rail attached to the base 15 , and by operating a lever 17, the seat can be adjusted in the fore and aft position according to the physique of the driver.

Further, the spring characteristics of the spring 12 can be adjusted according to the weight of the driver by rotating the bolt 14 and moving it back and forth along the load adjustment shaft 13 screwed into the bolt and the elongated hole 6.

18 is an elastic means made of an elastic material such as rubber fitted to a plate 19 installed between the links 8, and is used when an excessive load that cannot be absorbed by the spring 12 suddenly occurs. It presses against the bottom of the seat and prevents so-called undergarments.

In addition, since the forward movement of the shaft 11 is restricted by the front edge of the elongated hole 7, the parallelogram link mechanism is fully extended upwards due to bumping up when driving on rough roads, and the driver is forced to leave the seat. It can prevent you from being thrown out.

The present invention is constructed as described above, and the height of the seat can be kept low by at least the height of the spring, making it more compact. A spring suspension system for the seat with adjustable cushioning properties.

[Brief explanation of the drawing]

The drawings show an embodiment of the spring suspension system for a seat according to the present invention, and FIG. 1 is a side view, FIG. 2 is an enlarged side view of the main parts thereof, and FIG. 3 is a front view. 1... Seat, 6, 7... Elongated hole, 8, 9... Parallel link, 11... Shaft, 12... Spring, 13... Load adjustment shaft,
14...Bolt, 15 ...Base.

Claims (1)

[Scope of utility model registration request] a parallel link 8 between the seat attachment part 2 and the base 15 ;
A spring suspension system for a seat that supports a seat vertically freely via a seat mounting section 9, in which the seat mounting portion is made up of a front side wall 5 and opposing side walls 3 and 4 each having elongated holes 6 and 7; The lower ends of the links 8 and 9 are pivotally supported between the side walls of the base 15 , and the upper ends of the parallel links 8 and 9 are pivotally supported between the side walls 3 and 4 of the seat attachment part 2. A shaft 11 is fixed to the other end of a lever 10 extending from the upper end of one link 9 of the parallel links, and both ends of the shaft 11 are connected to the elongated hole 7.
The load adjusting shaft 13 is screwed into a bolt 14 rotatably supported on the front side wall 5 so as to be slidable along the elongated hole 6 extending in the horizontal direction. A spring is inserted between the respective ends of the load adjustment shaft 13 and the shaft 11 that protrude from the side walls 3 and 4 through the elongated hole 6 and protrude from the opposing side walls 3 and 4, respectively. A spring suspension system for a seat, characterized in that 12 is elastically connected.