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US Patent: RE4,470
Improvement in trip-hammers
Patentees:
John C. Butterfield - Chicago, IL
James Hay - Chicago, IL

USPTO Classifications:
72/431, 72/466.9

Tool Categories:
metalworking machines : forging machines : drop hammers

Assignees:
None

Manufacturer:
C. C. Bradley & Son, Inc. - Syracuse, NY

Witnesses:
George G. Hunt
N. N. Fiske

Patent Dates:
Granted: Jul. 18, 1871

Reissue Information:
Reissue of 108,326 (Oct. 18, 1870)

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for C. C. Bradley & Son, Inc.
Description:
This trip-hammer uses a rubber spring.

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