US Patent: 198,685 - Improvement in wrenches


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US Patent: 198,685

Improvement in wrenches

Patentee:

Sylvanus Edward Robinson (exact or similar names) - Newark, NJ

USPTO Classifications:

81/73

Tool Categories:

wrenches : brace wrenches

Assignees:

None

Manufacturer:

Sylvanus Robinson - Newark, NJ

P. Lowentraut Manufacturing Co. - Newark, NJ

Witnesses:

Patent Dates:
Applied:	Nov. 10, 1877
Granted:	Dec. 25, 1877

Patent Pictures: [ 1 | 2 | 3 ]

Sylvanus E. Robinson patent Dec. 25, 1977

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Description:

One known example marked "Robinsons Crank Wrench & Bit Brace Newark N.J. Pat. Jan. 26, 1875, Dec. 25, 1877"

One strange variant (see also Robinson's Jan. 26, 1875 patent no. 159,119) has a hammer poll for the crank handle, with the frame extended to form a claw -- the fulcrum point for the claw would "clash" with the knob for the jaw adjusting screw.