Overload protector for mechanical press
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 1, 2002
Grant Date -
N/A
app pub date -
Mar 24, 2000
filing date -
Mar 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Two hydraulic chambers (3a),(3b) within a slide (2) communicate with an overload protecting valve (12) through relief passages (11a),(11b). Check valves (13a),(13b) and discharge valves (14a),(14b) are arranged in series with each other in the respective relief passages (11a),(11b). When either of the two hydraulic chambers (3a),(3b) has a pressure not less than a set overload pressure, the overload protecting valve (12) opens to relieve pressurized oil within the hydraulic chamber (3a) to an exterior area via a restricting passage (78) of one discharge valve (14a) and the overload protecting valve (12). This switches over the two discharge valves (14a),(14b) to a discharging condition substantially at the same time to communicate the hydraulic chambers (3a),(3b) with a discharge port (R).
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