Shock absorber for bumpers

Claim 1

A shock absorber for bumpers comprising an outer cylinder with opposed ends having means for attachment to a car body, said outer cylinder provided at one of its ends with a closed bottom surface and at its other end with an opening, an inner cylinder slidably fitted into said opening in said outer cylinder and having means at its front end to which a bumper is to be fitted, a projection provided on the outer periphery of said inner cylinder and a stopper element on said outer cylinder co-acting with said projection on said inner cylinder so as to prevent said inner cylinder and outer cylinder from pulling apart, a rod guide fitted to said inner cylinder and having a center hole, a piston slidably fitted in sealing relationship in said inner cylinder and having a damping force generating hole, a piston rod connected with said piston and having its end part extending through said center hole of said rod guide to collide with the bottom surface of said outer cylinder and a compressive fluid enclosed in said inner cylinder, said inner cylinder being pressed into said outer cylinder so as to compress the fluid in said inner cylinder by the volume of the piston rod inserted in said inner cylinder when said inner cylinder engages said outer cylinder by said stopper, whereby on impact said piston and rod telescope into said inner cylinder thereby compressing said fluid.