Hook with pneumatic control circuit safety relief
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United States of America Patent
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-
Sep 6, 2022
Grant Date -
Aug 19, 2021
app pub date -
Feb 2, 2021
filing date -
Feb 13, 2020
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A load lifting hook assembly includes a body, a hook coupled to the body, a fluid connection on the body and connectable to a pressurized fluid source, a piston and a pressure relief valve. The piston is extendable from the body to engage the hook and lock the hook in a closed position relative to the body. The piston is configured to receive pressurized fluid from the fluid connection tending to urge the piston out of engagement with the hook. The pressure relief valve is positioned in the body in communication with the fluid connection and configured to prevent excess pressure in the pressurized fluid from acting on the piston.
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