US Patent: 411,536
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| Micrometer Gage
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 04, 1889 |
| Granted: |
Sep. 24, 1889 |
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Joel Havens
L. S. Starrett Co.-125th Anniversary
History of the L. S. Starrett Co.
Biography of L. S. Starrett
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Description: |
| This invention relates to the class of finely graduated measuring-gages in which a threaded spindle has heretofore been made adjustable in respect to its distance from a fixed head by rotation only. With the fine screw thread required by the nicety of the instruments the longitudinal movement of the spindle is very slow. It is the object of this invention to speed this movement and to provide for instantaneous adjustment of the spindle over the whole or any part of its axial path. The barrel or body of the instrument is tubular without longitudinal slots, and is threaded internally to form a stationary nut. The rotary spindle is recessed in its enlarged part within the barrel to receive two pivoted jaws externally threaded, forming the screw. These jaws are pressed outwardly into engagement with the internally threaded barrel by an axial plunger forced forward between the jaws by a spiral spring, thus automatically making a perfect fit between the screw and nut. These parts are instantly disengaged by withdrawing the plunger from contact with the jaws, which is effected by pressing the thumb and finger between the rotary sleeve and the terminal knob on the outer end of the plunger-rod, whereupon another spring brings the jaws together and releases them from the female thread.
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