Hydraulic device for producing a to-and-fro movement
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United States of America Patent
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-
May 19, 1981
Grant Date -
N/A
app pub date -
Jul 7, 1978
filing date -
Sep 15, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic device for producing a to-and-fro movement of a lever connected to a double-acting piston/cylinder unit comprises a pressure fluid distributor including a control piston for alternately feeding pressure fluid to one or the other side of the piston in the unit to move the lever alternately in opposite directions. A hydraulically actuatable control device for controlling the distributor includes a reciprocable piston member movable in a cylinder and a motion transmitting member in contact with the control piston of the distributor to transmit motion thereto. The piston member has a central large diameter section between two reduced diameter sections and the motion transmitting member is in contact with the surface of the piston member so as to reciprocate transversely in the cylinder when the piston member moves relative to the motion transmitting member between two end positions. The control device also includes an independently actuatable single-acting piston movable into a position where it holds the piston member with its large diameter section registering with the motion transmitting member.
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