Elongated self-contained actuator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 11, 2003
Issued Date -
N/A
app pub date -
Aug 13, 2001
filing date -
Aug 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic cylinder in which the cylinder head contains a motor-driven fluid pump, fluid reservoir, and a main control valve for the cylinder. The cylinder includes a transfer tube that extends through the center of the cylinder's piston and terminates within a hollow ported section of a piston rod. The cylinder head can additionally include two electrically-actuated pilot valves and two pilot-operated check valves. The pilot-operated check valves include structure that, in combination with passages in the cylinder head, cause both pilot-operated check valves to open when pressurized fluid is being directed to one of the pilot-operated check valves by the main control valve.
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