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US Patent: 210,875
Improvement in Drill-Chucks
Three-jaw scroll chuck with conical volute
Patentee:
Elijah S. Pierce - Hartford, CT

USPTO Classifications:
279/147, 279/62, 81/16, 81/461

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Theodore G. Ellis
John T. Peters
Willard Eddy

Patent Dates:
Applied: Mar. 22, 1878
Granted: Dec. 17, 1878

Patent Pictures:
The patent figures have been better aligned with each other.
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Description:
The volute normally used in a three-jaw, self-centering chuck has been reshaped into a cone so as to strengthen the scroll and also to cause the scroll to bear against the backs of the jaws closer to their centers.

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