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US Patent: 554,991
Lewis Petty Davidson - Denver, CO

USPTO Classifications:

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches

Lewis Petty Davidson - Denver, CO
Edward Barnes - Pleasant Hill, NE

J. H. Shepard & Co. - Denver, CO

H. O. Hendricks
Chas. E. Hill
Chas. Nida
J. Fred. Acker

Patent Dates:
Applied: Jun. 21, 1895
Granted: Feb. 18, 1896

Patent Pictures: [ 1 | 2 | 3 ]
L. P. Davidson patent February 18, 1896
USPTO pdf tiff
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An interrupted screw with a thumb toggle is the adjusting device. It allows for quick adjustment. The thumb toggle portion is housed in a slot in the handle.

Corresponding Canadian patent no. CA-52,326 issued May 20, 1896 lists a different assignee. British patent GB-189608370 registered April 21, 1896 does not mention Davidson.

The only marking on known examples is "PAT FEB. 28-96". Pat. no. 513,308 is a precursor.

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