US Patent: 90,338


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US Patent: 90,338

Chuck

Patentee:

George E. Brettell (exact or similar names) - Rochester, NY

USPTO Classifications:

279/69

Tool Categories:

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

Assignees:

None

Manufacturer:

G. E. Brettell - Rochester, Monroe County, NY

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.