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US Patent: 111,248
Improvement in machines for cutting screw-threads on bolts
Salmon W. Putnam, Jr. - Fitchburg, MA

USPTO Classifications:
408/16, 408/174, 470/75

Tool Categories:
metalworking machines : metal threading machines


Not known to have been produced

John F. Haskins
C. F. Putnam

Patent Dates:
Granted: Jan. 24, 1871

Patent Pictures:
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"Vintage Machinery" entry for Putnam Machine Co.
Crosby, Halsted & Gould - patent attorneys

This invention relates details in the construction of that class of machines in which the bolt to be screw threaded is held from rotation, but is allowed to advance toward and. retreat from the screw-thread-forming dies which are made to rotate.

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