Shock absorber
AssigneeMetrol Co., Ltd.
InventorAkira Matsuhashi
Life of this patent
Estimating the term…
Abstract
In an air-type shock absorber, a piston is sealing situated in a cylinder chamber. A vacuum state occurs in a piston bearing side of the cylinder chamber when a piston is pushed. Also, an air reservoir is provided at a side opposite to the piston bearing to have a sealed structure, so that a force of absorbing a shock can be increased to have the same effect as in an oil-type shock absorber. The shock absorber can be used not only at a place requiring cleanness but also in adverse environment in which the shock absorber is exposed to water or coolant, and durability of the shock absorber is also improved.
Claims8
A shock absorber, comprising:
- a cylinder having a cylinder chamber,
- a piston bearing formed at one side of the cylinder,
- a piston slidably situated in the cylinder chamber and including a piston shaft slidably held at the piston bearing and having a distal end projecting from the piston bearing, said piston, when the distal end is pressed by a moving member, slidably moving in the cylinder chamber to form a compression side of the cylinder for compressing air and a vacuum side at a side of the piston shaft,
- a flow quantity control valve attached to the compression side of the cylinder for controlling a quantity of air flowing from the compression side to thereby control a force of absorbing a shock in case the piston compresses air at the compression side of the cylinder chamber,
- a check valve attached to the compression side of the cylinder, said check valve being opened only when a large amount of air is rapidly fed to the compression side of the cylinder chamber in case the piston returns to an original position after compressing air in the cylinder chamber,
- a through hole formed in the piston to penetrate between the compression side and the vacuum side, and
- valve means formed in the through hole for opening and closing the through hole in accordance with a movement of the piston in the cylinder chamber to thereby increase the force of absorbing the shock.
Dependencies are inferred from the claim text.