Overload protector for mechanical press
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United States of America Patent
Stats
-
Sep 11, 2001
Grant Date -
N/A
app pub date -
Dec 20, 1999
filing date -
Dec 18, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic hydraulic booster pump (5), an overload protecting valve (10) and a pressure compensating valve (14) are connected in parallel with an overload absorbing hydraulic chamber (3) within a slide (2) of a mechanical press (1). The pressure compensating valve (14) has a restricting passage (60) and a relief valve (61) connected to each other in series. The relief valve (61) comprises a valve closing piston (71) which pushes a relief member (72) in a direction for valve closing, a valve closing actuation chamber (73) which communicates with a compressed air supply passage (30) of the booster pump (5), and a compression spring (74) which urges the relief member (72) in the direction for valve closing.
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