Method for operating a hydraulically operated hand-held device and hydraulically operated hand-held device
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United States of America Patent
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Jun 23, 2020
Grant Date -
Aug 23, 2018
app pub date -
Feb 5, 2016
filing date -
Feb 27, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A method for operating a hydraulically operated hand-held device is provided. The hand-held device includes a hydraulic pump, a moving part, a fixed part and a return valve with an associated valve seat. The moving part can be displaced into a working position by a build-up of hydraulic pressure produced by filling a hydraulic chamber with hydraulic medium from a storage chamber using the hydraulic pump. The moving part can be automatically moved back from the working position into an end position by opening the return valve, if a predetermined working pressure is reached. The hydraulic pressure acting upon the return valve for triggering a movement of the moving part into the end position is increased independently of reaching the predefined working pressure.
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