Hydraulic cylinder
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United States of America Patent
Stats
-
Jan 12, 1988
Grant Date -
N/A
app pub date -
Jan 18, 1982
filing date -
Jan 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic cylinder usable as a shock-absorbing trim and tilt cylinder for adjusting the position of an outboard motor or outdrive unit of a boat, is provided with a piston including pilot-operated valve means which stepwise responds at a precisely setable pressure, to pressures resulting from impact of an outboard motor or outdrive unit upon an obstacle, the valve means then departing as a poppet-type relief valve to allow the outboard motor or outdrive unit to return to operative position following the impact. The hydraulic cylinder is provided with an integral conduit formed by milling a groove or slot from a point adjacent its mounting end to the point adjacent its rod end, and fastening a cover over the groove. The cylinder's mounting eye end is provided with passages that cooperate with passages in its mounting pin to supply hydraulic fluid to first and second chambers defined by the piston within the cylinder, one of the passages in the mounting eye end intersecting the integral conduit to supply fluid to the rod-end chamber defined by the piston.
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