초록 ▼

A shock absorber having a casing containing compressible fluid and a piston head with structure for providing fluid amplification during normal piston head movement, the piston head having a central bore therein for slidably mounting the piston head for axial movement on the piston rod and being bia

A shock absorber having a casing containing compressible fluid and a piston head with structure for providing fluid amplification during normal piston head movement, the piston head having a central bore therein for slidably mounting the piston head for axial movement on the piston rod and being biased against a holding member by Bellville washers, a valve on the holding member obstructing conduits between the piston rod and the piston head when the piston head is biased against the holding member, the conduits being uncovered by the valve to permit flow therethrough from one side of the piston head to the other when the pressure in the shock absorber in the area of the holding member exceeds a predetermined value, the conduits between the piston head and piston rod being of a shape to provide a second stage of fluid amplified flow.

대표청구항 ▼

In a shock absorber having a casing, a piston rod having a first portion in said casing and a second portion extending outwardly beyond said casing, compressible fluid within said casing, a piston head having first and second opposite sides, fluid amplification means on said piston head for providin

In a shock absorber having a casing, a piston rod having a first portion in said casing and a second portion extending outwardly beyond said casing, compressible fluid within said casing, a piston head having first and second opposite sides, fluid amplification means on said piston head for providing a stage of fluid amplification, and first and second chambers in said casing on said first and second opposite sides of said piston head, respectively: the improvement comprising a bore in said piston head for receiving said first portion of said piston rod, an abutment on said first portion of said piston rod spaced from said first side of said piston head, spring means positioned between said abutment and said first side of said piston head, holding means on said first portion of said piston rod in engagement with said second side of said piston head under the bias of said spring means, conduit means between said piston head and said piston rod extending between said first and second sides, valve means on said holding means for normally closing said conduit means when said second side is in engagement with said holding means, and a slidable connection between said bore and said first portion of said piston rod for permitting said piston head to move toward said abutment against the bias of said spring means when the fluid force in said second chamber on said second side of said piston head exceeds the biasing force of said spring means to thereby cause said valve means to uncover said conduit means to permit flow of fluid from said second chamber to said first chamber, said conduit means including a central portion of a first effective diameter and outwardly flared ends of increasing second diameters at both opposite end portions of said conduit means to provide a second stage of fluid amplification during pressure relief action in addition to the stage of fluid amplification provided by said fluid amplification means on said piston head.