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US Patent: 2,531,285
Wrench With Self-Adjusting Jaws
Patentee:
Edward L. Manspeaker - Turtle Creek, PA

USPTO Classifications:
81/154, 81/344, 81/379, 81/408

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Assignees:
None

Manufacturer:
Channellock - Meadville, PA

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 08, 1948
Granted: Nov. 21, 1950

Patent Pictures: [ 1 | 2 | 3 ]
Edward L. Manspeaker Pat. Nov. 21, 1950
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Description:
This self-adjusting locking pliers uses sliding wedges in one handle as the "anchor" for the toggle. This patent together with 2,576,286 and 2,997,903 is cited on the ChannelLock 910 Grip-Lock locking pliers. A 1966 ChanneLLock GripLock 910 ad identifies the tension spring on the tool with this patent.

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