Pneumatic-hydraulic shock absorber

Claim 1

In a shock absorber having a first chamber formed by a hollow cylinder and containing a liquid and a second chamber formed by a hollow piston having an end wall with an orifice and being slidably mounted for horizontal movement in the cylinder, and said second chamber containing a liquid and a compressed gas, the two chambers being connected by a deflector tube axially mounted to said orifice, said deflector tube extending into the piston chamber and exiting into the liquid, a metering pin mounted to the cylinder chamber and adapted to operate within the deflector tube for controlling the passage of the liquid between the chambers, the improvement comprising in combination therewith the end wall of the piston comprising a first and a second section having adjoining unexposed surfaces, said first section forming a part of the first chamber and said section forming a part of the second chamber, at least one of said sections having an annular recess in the unexposed surface, said annular recess connected to substantially the top of the first chamber by a passageway through said first section and connected to substantially the bottom of said second chamber by a passageway through said second section, said sections joined to form the end wall having an interconnected passageway therethrough.