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US Patent: 216,776
Bit-stock wrenches
Patentee:
Quimby S. Backus - New York, NY

USPTO Classifications:
279/36, 81/114

Tool Categories:
woodworking tools : braces : brace chucks
wrenches : brace wrenches

Assignees:
None

Manufacturer:
Q. S. Backus - New York, NY
Q. S. Backus - Winchendon, MA

Witnesses:
F. H. Schott
D. P. Cowl
Wm. J. Bell
John F. Kavanagh

Patent Dates:
Applied: Apr. 30, 1879
Granted: Jun. 24, 1879

Patent Pictures:
Quimby S. Backus patent June 24, 1879
USPTO pdf tiff
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Sinclair and others v. Backus
Description:
The cone-shaped body holds jaws that close as the exterior cone-shaped threaded sleeve is screwed out. A cross-member with a central hole acts to retain the jaws in the body, and stabilize tools like drill bits when the jaws function as a chuck.

Variants were produced with and without the auxiliary ratchet shown in the drawings. In Sinclair and others v. Backus, the ratchet feature was challenged as infringement on the Moore ratchet patent (no. 45,334) used by the Lowell Wrench Company.

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