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US Patent: 936,980
Tongs
Patentee:
Arnold Bing - Canby, MN

USPTO Classifications:
24/494, 81/321, 81/344, 81/382, 81/383, 81/385

Tool Categories:
trade specific : blacksmith
work holding
pliers

Assignees:
Arnold Bing - Canby, MN
Hennie Mortenson - Canby, MN

Manufacturer:
Not known to have been produced

Witnesses:
Cora K. Handy
Arthur Ovrum
J. P. Langmack

Patent Dates:
Applied: Sep. 28, 1908
Granted: Oct. 12, 1909

Patent Pictures:
Arnold Bing patent October 12, 1909
USPTO pdf tiff
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Description:
The gripping force on the jaws is regulated by the adjustable spring tension. The lever handle and linkage provide for an "over center" effect so that once the jaws are clamped on to the work piece, the grip remains constant until released.

This patent is cited in later patents for self-adjusting locking pliers such as 6,591,719.

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