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US Patent: 3,288,001
Chain Wrench
Jonathan L. Laird, Jr. - Coatesville, PA

USPTO Classifications:
81/68, D8/21

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


Not known to have been produced


Patent Dates:
Applied: Jun. 08, 1964
Granted: Nov. 29, 1966

Patent Pictures:
Jonathan L. Laird, Jr. patent November 29, 1966
USPTO pdf tiff
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The special chain can safely grip pipe included the threaded portion without distorting the pipe or deforming the pipe surface. It will also grip hexagonal or square nuts or other irregular forms. The patent includes special friction devices on the wrench to provide a ratchet-like action.

Used together with pat. no. 4,138,910 in the GRIP-IT chain wrench.

The specifications cite three European patents and U.S. patents 1,316,875 and 2,665,604 as references.

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