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US Patent: 391,655
Tap or Die Stock
Benjamin F. Smith - Somerville, MA

USPTO Classifications:
470/207, 81/180.1, 81/59.1

Tool Categories:
wrenches : tap wrenches and die stocks
wrenches : ratchet wrenches


F., F. Waters Mfg. Co. - Boston, MA
Smith Friction Drill and Tool Co. - Boston, MA

H. S. Chapin
Henry Chadbourn
Alban Andren

Patent Dates:
Applied: Jan. 09, 1888
Granted: Oct. 23, 1888

Patent Pictures: [ 1 | 2 ]
Benjamin F. Smith patent October 23, 1888
USPTO pdf tiff
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Ratchet action provided by spring-loaded rollers in wedge-shaped chambers. The tool includes provision for a central brace pad, for interchangeable wrench sockets, tap holder, adjustable jaw socket, etc. These attachments have "tang" ends and are held by a set screw. One of the handles is detachable to allow working as a ratchet in constricted locations.

Produced as the SMITH FRICTION DRILL and socket wrench.

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