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US Patent: 1,023,533
Pipe Wrench
Patentees:
Harry R. Sinclair (exact or similar names) - Worcester, MA
Carl Ekman (exact or similar names) - Worcester, MA

USPTO Classifications:
81/64

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

Assignees:
Harry R. Sinclair - Worcester, MA

Manufacturer:
Not known to have been produced

Witnesses:
Lucy M. Burrows
Harrison W. Bowker
Edward G. Allen
Joseph M. Ward

Patent Dates:
Applied: Aug. 28, 1909
Granted: Apr. 16, 1912

Patent Pictures:
Harry R. Sinclair and Carl Ekman patent April 16, 1912
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Description:
A modification of Sinclair's July 12, 1904 (pat. no. 764,641) strap wrench. In this patent, the fixed end of the strap is held by a wedge in a tapered throat.

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