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US Patent: 376,504
Improvements in Removable Jaws For Wrenches
Henry William Atwater - East Orange, NJ

USPTO Classifications:
81/134, 81/184, 81/186

Tool Categories:
wrenches : wrench components : pipe jaw attachments for wrenches


Henry William Atwater - Newark, NJ

L. Lee
J. Henry Kaiser
Henry J. Miller
Frederick C. Fischer

Patent Dates:
Applied: Apr. 14, 1887
Granted: Jan. 17, 1888

Patent Pictures: [ 1 | 2 | 3 ]
Henry W. Atwater patent January 17, 1888 -- the starred version was produced
USPTO pdf tiff
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The patent is for the removable serrated jaw which converts a "monkey wrench" into a pipe wrench. Produced as the MODEL gripping jaw in graduated sizes.

The specifications contrast this jaw's construction with those described in patent nos. 51,961 and 214,697.

The wrench shown in the drawing is Atwater's "TIGER," based on patent nos. 206,851 and 284,162.

The corresponding Canadian patent is no. CA-28,724; corresponding British patent GB-188800927 was registered Jan. 21, 1888.

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