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US Patent: 90,338
Chuck
Patentee:
George E. Brettell - Rochester, NY

USPTO Classifications:
279/69

Tool Categories:
metalworking machines : drilling and boring : drill presses : drill press chucks

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Charles A. Chapin
Thomas S Grover

Patent Dates:
Granted: May 25, 1869

Patent Pictures:
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Description:
Claim.

In self-centring chuck, closed by movable inclines, I claim the construction and arrangement of the slotted jaws, ferrules, and springs, as and for the purpose specified.

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