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US Patent: 3,505,914
Chain Wrench
Virgil M. Ockinga - Morrill, NE

USPTO Classifications:
81/65.2, 81/68, D8/22

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches


O.K. Tool Corp. - Wood River, NE
A. O. K. Tool Corp. - Alda, NE


Patent Dates:
Applied: Oct. 24, 1967
Granted: Apr. 14, 1970

Patent Pictures: [ 1 | 2 ]
Virgil M. Ockinga patent April 14, 1970
USPTO pdf tiff
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The chain doubles back on itself, and hooks onto a slide with an inner compression spring. The spring holds the chain snugly around the object to be gripped. The head of the wrench bar is curved, with a groove to hold the chain from sliding laterally. The chain has gripping teeth cut on its inner surface.

Some larger size examples were made with aluminum handles.

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