US Patent: 749,544


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US Patent: 749,544

Wrench

Patentee:

William H. Ermentrout (exact or similar names) - Reading, PA

USPTO Classifications:

81/96

Tool Categories:

wrenches : pipe wrenches

wrenches : wrench adjustment types : self-adjust wrenches

Assignees:

None

Manufacturer:

Reading Machine and Tool Company - Reading, PA

Witnesses:

Patent Dates:
Applied:	Sep. 23, 1903
Granted:	Jan. 12, 1904

Patent Pictures:

William H. Ermentrout patent January 12, 1904, with ERMO pipe wrench -- Richard Lawton collection

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Description:

A compression spring inside the hollow handle pushes the sliding grip with its roller jaw against the hook jaw. The gear teeth on the roller jaw and rack teeth on the frame tighten the grip.

The manufacturer is noted in Ken Cope's "American Wrench Makers 1830-1930."