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US Patent: 1,885,616
Homer A. Mead - Turlock, CA

USPTO Classifications:

Tool Categories:
wrenches : wrench components : wrench jaw components
wrenches : wrench adjustment types : self-adjust wrenches
wrenches : pipe wrenches

Masterench Corporation - Turlock, CA

Masterench Corporation - Turlock, CA
Heller Bros. Co. - Newark, NJ


Patent Dates:
Applied: Apr. 09, 1931
Granted: Nov. 01, 1932

Patent Pictures:
Homer A. Mead Pat. Nov. 1, 1932
USPTO pdf tiff
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The patent is an improvement on Mead's November 12, 1929 pipe wrench patent (no. 1,735,257). The movable jaw has two angular indentations to accommodate a wider range of sizes, and a "thumb cam" to open the jaw. The spring holding the jaw in the closed position is modified from the earlier patent. The drawing also shows a square opening and textured grip in the handle which are features of some MASTERENCH wrenches, although they are not mentioned in this patent's specifications.

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