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US Patent: 78,916
Drill Chuck
Eli H. Babcock - Canandaigua, NY

USPTO Classifications:

Tool Categories:
woodworking tools : hand drills : drill chucks


Not known to have been produced

John S. McClure
John Standish

Patent Dates:
Granted: Jun. 16, 1868

Patent Pictures:
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This invention relates to an improvement in the method of holding and truing steel drills in lathes and drilling-machines, whereby machine-work is greatly facilitated, and whereby the process of drilling in iron, steel, or other metals can be much more accurately performed than when done by drills held in the ordinary manner. And the invention consists in securing the drill in an elastic conical jaw, with a screw-thread thereon, and a conical nut which engages therewith, and also in an elastic reducer, whereby drills of smaller size may be firmly and accurately centred and held while in use..

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