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US Patent: 87,133
Improved Mode of Constructing Wrenches, or Levers for Turning Taps
Benjamin F. Bee - Harwich, MA

USPTO Classifications:
408/240, 81/175

Tool Categories:
wrenches : tap wrenches and die stocks


Morse Twist Drill & Machine Co. - New Bedford, MA

Wm. H. Underwood
Geo. H. Munsell

Patent Dates:
Granted: Feb. 23, 1869

Patent Pictures: [ 1 | 2 | 3 ]
Benjamin F. Bee patent Febr. 23, 1869
USPTO pdf tiff
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The sliding blocks in this tap wrench have notches with unequal sized sides. The effect of this design is that the wrench will firmly contact two corners and two opposite sides of the square head of any tap or drill within its capacity and hold the tool in the center of the adjustable opening.

A tap wrench with markings including this patent date and "M.T.D. & M. Co." has the distinctive jaws, with the clamping force supplied by a separate screw rather than the screw incorporated in the handle.

A tap wrench exactly matching this patent drawing is listed in an 1875 Frasse & Co. catalog with no maker identified.

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