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US Patent: 791,245
Warren S. Casterlin - Pittston, PA

USPTO Classifications:
81/351, 81/387, 81/405

Tool Categories:
wrenches : pliers type wrenches


Not known to have been produced

C. D. Davis
Sidney P. Hoilingsworth
William A. Francis
James R. Ehret

Patent Dates:
Applied: Mar. 21, 1905
Granted: May 30, 1905

Patent Pictures:
Warren S. Casterlin patent May 30, 1905
USPTO pdf tiff
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One focus of the patent is the spherical "collar" which is to sustain wear and keep the jaws in alignment, and related characteristics of the jaw pieces. Multiple "slots" in one jaw allow for re-positioning to adjust the size capacity of the jaws. A second focus of the patent is the hardened jaw face insert.

The patent notes the handle structure adopted from Casterlin's Dec. 5, 1899 patent no. 638,378.

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