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US 4,899,986 AGranted
Rotary hoist
OwnerJames E. Tweedyinventor
Life of this patent
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Abstract
A rotary hoist generally comprising a vertically extending shaft, a tubular housing telescoped over and rotatably supported on the shaft, a boom pivotally secured to the tubular housing and a jack pivotally secured between the housing and the boom. The shaft is supported by a leg socket member with elongated legs. The rotary hoist may be disassembled for storage or shipping.
Claims14
A rotary hoist for hoisting an object, comprising:
- a generally vertically extending stationary guide shaft having an upper end and a lower end said lower end being attached to a base;
- an outer tubular housing rotatably supported on the shaft, the outer tubular housing having an upper end and a lower end;
- an inner tubular housing having an upper end and a lower end, the inner tubular housing lower end being telescopingly and rotatably received within the outer tubular housing upper end, the inner tubular housing being rotatably and slideably mounted along said shaft,
- a boom pivotally secured at one end thereof to the inner tubular housing adjacent the upper end of the inner tubular housing, wherein the boom is capable of securing the object to be hoisted;
- a jack having one end pivotally secured to the outer tubular housing below the connection of the boom to the inner tubular housing and having its opposite end pivotally secured to an intermediate portion of the boom for raising and lowering the boom, wherein the inner tubular housing with the boom secured thereto is capable of 360 degree rotation about the shaft while the object is secured to the boom.
2 more elements
Dependencies are inferred from the claim text.