US Patent: 253,266
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| Screw Nut
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Patentee:
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| Samuel Darling (exact or similar names) - Providence, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 29, 1881 |
| Granted: |
Feb. 07, 1882 |
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Joel Havens
"Vintage Machinery" entry for Brown & Sharpe Mfg. Co
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Description: |
| Abstract:
The object of my invention is to so construct r the nut that by its proper adjustment and use the thread of the nut and the thread of the screw upon which it runs may both be made and kept of the same anti uniform pitch, and all longitudinal play of the nut on the screw prevented, and that it may he adjusted with facility and with the great accuracy which its use requires; and my invention consists in making the nut in two parts, one part being permanently fixed to the machine and the other a part made adjustable; in making the fixed part of the nut and a holder for the adjustable part in one piece, the adjustable part being held in the holder in exact line with the fixed part; in attaching the adjustable part of the nut to the holder by means of a screw cut upon its outer contour corresponding to and accurately fitting a female screw in the holder; in providing the adjustable part with a radial index-arm by which, in connection with a graduated scale, it can be turned and adjusted, and in arranging the fixed part of the nut and the holder for the adjustable part upon bearings to be automatically turned when the machine is in operation; in making the threads of the nut and the threads of the screw upon which it runs of the same and uniform pitch by attrition, the nut being alternately adjusted and run on the screw for that purpose and, also, in making both parts of the nut and holder of the same kind of metal of which the screw is made upon which the nut is to run.
Claim:
A nut made in two parts for the leading-screws of dividing and screw-cutting engines, micrometers, and all screws that require great accuracy, one part being fixed and the other adjustable independently of the fixed part, the fixed part and a holder for the adjustable part being made in one piece or separate pieces rigidly held together. |
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