US Patent: 237,594


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US Patent: 237,594

Wrench

Patentees:

Carl Ludwig Praeger (exact or similar names) - Philadelphia, PA

Hubert Francisco Praeger (exact or similar names) - South Bethlehem, PA

USPTO Classifications:

81/111, 81/129.5, 81/149, 81/154

Tool Categories:

wrenches : wrench adjustment types : self-adjust wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	Dec. 08, 1880
Granted:	Feb. 08, 1881

Patent Pictures: [ 1 | 2 ]

C.L. Praeger and H. F. Praeger patent February 8, 1881 ... first form

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Description:

The self-adjustable jaw's adjustment is held by a spring pushing rack teeth on the shank against a spur tooth on the frame. Alternate forms with and without an intermediate shoe are shown in the drawings.