US Patent: 433,311
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| Micrometer Gage
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Patentee:
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| Laroy S. Starrett (exact or similar names) - Athol, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 02, 1889 |
| Granted: |
Jul. 29, 1890 |
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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 gages having a spindle screw-threaded at one end to engage with a corresponding thread within a stationary tubular barrel provided with longitudinal graduations, a peripherally-graduated sleeve fixed to the outer end of the spindle revolving outside of said barrel. The object of the present improvements is to guard against backlash or lost motion in the screw-thread and compensate for wear therein, thus securing a uniform tension, and also to provide an efficient locking device to hold the spindle firmly at any desired position. I accomplish the first of these objects by means of a split bushing screwed into the outer end of the tubular barrel, such bushing being internally threaded to engage with the spindle, and having along one or both of its sides a section or tongue lying between two slots and sprung inwardly at its free end toward the axis, being thereby slightly lessened in axial length and depressed more closely into the threads of the spin die. These minute changes of position of the threads of the spring-tongues with relation to those of the rigid remainder of the bushing and of the spindle press back the threads of the spindle firmly against those of the bushing and suffice to take up automatically all end-play of the spindle, to compensate for any wear thereof, and to insure a perfect fit of the screw threads. This bushing is prolonged by an unthreaded slotted tubular extension, forming connected spring-lingers surrounding an unthreaded part of the spindle and converging at their forward free ends and caused to grip the spindle by means of a thimble-nut screwed into the inner end of the barrel or frame and having a tapering bore which forces the prongs inwardly against the spindle.
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