US Patent: 487,410
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| Automatic Stop for Micrometer Gages
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Patentee:
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| George Sylvia (exact or similar names) - Waltham, Middlesex County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 25, 1892 |
| Granted: |
Dec. 06, 1892 |
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Joel Havens
"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.
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Description: |
| My invention relates more particularly to hand-tools such as watchmakers' micrometer-gages, calipers, and screwdrivers in which delicate measurements and the most perfect accuracy and delicacy of adjustment are essential to the best workmanship. The tools now used in watchmaking and the manufacture of delicately constructed instruments are adjusted with the greatest accuracy and are made to record or to detect the slightest variations in the work to which they are applied; but in the use of such instruments the results are found to be unsatisfactory, because varying according to the different workmen who use them, on account of differences in their nicety of touch, and often in the work of the same workman, according to the care taken by him, and also because with careful workmen much time is consumed in securing the desired accuracy. In the use of the micrometer-gage a slight overpressure upon the measuring ends when in contact with the work will expand or spread the ends apart and produce inaccuracies in the measurement of the work done. The object of my invention is to overcome these difficulties and defects by providing for micrometer-gages, watchmakers' screwdrivers, and other instruments requiring great delicacy of adjustment a device by which the forward movement of the screw turned by the hand will be stopped automatically when the desired contact has been made with the work for the purpose of measuring the same or in setting the screw or for other similar purposes. Another object of my invention is to increase the rapidity of the forward movement of the micrometer-gage screw or other forward-moving shaft under the same motion of the hand or fingers as is now used in these instruments as at present constructed. My invention has also in view the production of means by which the rotating sleeve upon the spindle of the gage or other tool may upon being reversed immediately lock with, the spindle and rotate with the same. |
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