Patent ID: 9611872
Date: 2017-04-04
CPC Classifications: F01B,F15B

Claim:
1. A hydraulic cylinder comprising: a casing with a longitudinal axis defined therethrough; a first fluid inlet defined in said casing; a second fluid inlet defined in said casing; a first fluid outlet defined in said casing; a second fluid outlet defined in said casing; a shaft extending along the longitudinal axis; a first switching valve mounted to said shaft; a second switching valve mounted to said shaft; and a piston mounted to said shaft between said first switching valve and said second switching valve, wherein said hydraulic cylinder is configured such that when a fluid is supplied to said first and second fluid inlets, said shaft, said first and second switching valves, and said piston oscillate back and forth along the longitudinal axis, wherein said casing defines a first main cavity and a second main cavity separated from said first main cavity by said piston, wherein said casing defines a first inlet chamber having a first aperture in fluid communication with said first fluid inlet and a second aperture in fluid communication with said first main cavity, and wherein said first switching valve is configured to selectively block said first inlet chamber second aperture.