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US Patent: 870,781
Pipe-Wrench
CRAFT roller-jaw pipe wrench
Patentee:
George Heckling - Cleveland, OH

USPTO Classifications:
81/96

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Attwood Mfg. Co. - Conneaut, OH
Craftsman Tool Co. - Conneaut, OH
Pittsburgh Malleable Iron Company - Pittsburgh, PA

Witnesses:
B. C. Brown
Daniel E. Daly
C. H. Dorer

Patent Dates:
Applied: May 15, 1906
Granted: Nov. 12, 1907

Patent Pictures: [ 1 | 2 ]
George Heckling Pat. November 12, 1907
USPTO pdf tiff
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"Vintage Machinery" entry for Craftsman Tool Co.
Description:
The roller gripping jaw is held in engagement by a compression spring, and by the interlock formed by the gear teeth on the roller engaged with rack teeth on the shank, and the gripping knurl engaging the item to be grasped. "Forward" motion tightens the grip, "backward" motion relaxes it.

Production by the Pittsburgh Malleable Iron Company after the mid-1920s probably includes alterations reflected in patent no. 1,593,588.

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