Brakes – Strand – Tortuous grip
Reexamination Certificate
1999-10-13
2003-05-27
Schwartz, Christopher P. (Department: 3683)
Brakes
Strand
Tortuous grip
C188S065300
Reexamination Certificate
active
06568511
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to lifting devices and, more particularly, to lifting devices having a locking mechanism.
2. Background of the Invention
Lifting devices are commonly used for lifting and moving products in plants, warehouses, distribution centers, and other locations in the marketplace. Given their widespread and increasing use, it is important that such devices be reliable in operation, easily operated and safe. The lifting devices disclosed herein are improvements of the lifting devices disclosed in U.S. Pat. No. 5,921,353, which issued Jul. 13, 1999, to Steven T. Day.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, an adjustable lifting sling includes a support with means for hanging the support, a locking arm rotatably connected to the support with at least one locking surface and at least one cam surface pivotally connected to the support to mate with the a locking surface and hold a flexible rope, wire, chain, straps, or other tensile lifting member between them. The lifting sling is easy to operate, reliable, and safe. The sling of the invention also allows for adjustment to accept different thicknesses and sizes of the tensile lifting member.
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Durkee William D.
Howrey Simon Arnold & White , LLP
Schwartz Christopher P.
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