| 摘要 |
A mechanical lifting jack with a locking mechanism that arrests upward motion of the handle if the handle is suddenly released by the operat or while raising or lowering a load. A latch on the pivot attachment of the handle to the lifting assembly is actuated by a lever disposed at the distal end of th e handle, and engages into a toothed safety link when the lever is released. In the event that the operator suddenly releases the handle accidentally, the latch engages th e safety link to arrest the upward motion of the handle. The invention can also be us ed to lock the handle into an upright position alongside the vertical support for compact storage.
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