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US Patent: 116,090
Improvement in Extension-Shanks for Boring-Bits
Patentee:
William S. Pattin - Portsmouth, OH

USPTO Classifications:
279/78, 285/81

Tool Categories:
woodworking tools : hand drills : drill bit extensions

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. B. Grice
John H. Peck

Patent Dates:
Granted: Jun. 20, 1871

Patent Pictures:
USPTO pdf tiff
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Description:
Combination of a "clamp dog" and moveable sleeve, driven down onto the shank of the bit by a following nut, is intended to firmly secure bits while remaining small enough in diameter to follow the bits through the hole.

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