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US Patent: 280,339
Micrometer Calipers
Merrick M. Barnes - Boston, MA

USPTO Classifications:

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


A. J. Wilkinson - Boston, MA

Joseph Ishbaugh
Henry W. Williams

Patent Dates:
Applied: Feb. 12, 1883
Granted: Jul. 03, 1883

Patent Pictures: [ 1 | 2 | 3 | 4 ]
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Henry W. Williams - patent attorney

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In micrometer calipers, the arm A and nut in which the micrometer-screw turns, said arm and nut being made separate and supporting the screw near its opposite ends, and said arm forming at its point of support a plain bearing for the screw, applied to the portion thereof which is not threaded, substantially as and for the purpose set forth.

2. In micrometer calipers, the combination, with the arm A, of the nut E, hollowed out at g, and provided with the adjusting or take-up screw situated between said arm and the portion of the nut in which the screw operates, substantially as and for the purpose described.

3. The combination of the arms A A', nut E, provided with the annular groove g, longitudinal saw-kerf , arms E', and adjusting screw h, and the micrometer-screw C, all constructed and arranged substantially as and for the purpose set forth.

4. In micrometer - calipers, the combination, with the micrometer screw, of a yielding supporting nut, constructed substantially as shown, whereby a spring-pressure is produced on said screw when the nut is in position for use, for the purpose specified.

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