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US Patent: 1,549,635
Thread Gauge
Paul F. Vokal - Hartford, CT

USPTO Classifications:

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers
metalworking tools : machinist tools : measuring tools : thread gages

Pratt & Whitney Co. - New York, NY

Not known to have been produced

none listed

Patent Dates:
Applied: Sep. 23, 1923
Granted: Aug. 11, 1925

Patent Pictures:
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"Vintage Machinery" entry for Pratt, Whitney & Co.
This invention relates to gauges and particularly to a thread gauge for measuring the pitch diameter of threading taps. Such a tap ordinarily comprises a plurality of spaced thread cutting lands there around, as shown in the accompanying drawing. It is of course essential that the pitch diameter of these taps shall be accurate within certain

limits and it is the primary object of this invention to provide a gauge particularly adapted to measure such diameter.

It is a further object of the invention to provide a U-shaped gauge having a pair of anvils on one arm thereof for engaging the threads on two adjacent lands of a tap and a cooperating micrometer-operated thread engaging element on the other arm for engaging the threads on a land opposite the said two adjacent lands, the said anvils and their supporting element preferably being loosely mounted whereby to freely adjust themselves to the threads being gauged.

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