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US Patent: 79,724
Wrench
Improvement in Pipe-Tongs
Patentee:
James R. Brown - Boston, MA

USPTO Classifications:
81/399, 81/426

Tool Categories:
wrenches : pipe wrenches : pipe tongs

Assignees:
E. H. Ashcroft Co. - Boston, MA

Manufacturer:
E. H. Ashcroft Co. - Boston, MA

Witnesses:
S. N. Piper
J. H. Mullin
E. H. Eddy
F. P. Hale, Jr.

Patent Dates:
Granted: Jul. 07, 1868

Patent Pictures: [ 1 | 2 ]
James R. Brown patent July 7, 1868
USPTO pdf tiff
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Description:
Brown describes this tongs as an improvement on his November 30, 1858 patent (No. 22,157). The thumb screw adjusts the jaw opening, and pins keep the two main pieces together without need for a fixed or adjustable pivot block.

This tongs appears in an 1886 catalog from a Chicago hardware supplier.

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