Hydraulic single piston pump for manual operation
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United States of America Patent
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May 8, 1990
Grant Date -
N/A
app pub date -
Nov 21, 1988
filing date -
Apr 1, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic single piston pump for manual operation has a piston (3) with a first channel (14, 20) running from piston chamber (7) to the rod chamber (5). The first channel has a check valve (15-19) opening in the return stroke. The piston (3) also has at least one second channel (22, 23, 25) running from the piston chamber (7) to the rod chamber (5). The second channel is configured as a choke bore (23, 25) along at least a part of its length.
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