US Patent: 4,070,760
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| Micrometer
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 26, 1976 |
| Granted: |
Jan. 31, 1978 |
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Joel Havens
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Description: |
| Abstract
A vertical upright U-shaped member has two parallel legs with parallel vertical inner and outer surfaces, the inner surfaces being adjacent and parallel to each other, one leg having a horizontal bore extending transversely between its inner and outer surfaces and disposed adjacent the upper end of this leg. A sleeve is removably disposed in the bore. A flat disc lies in a vertical plane and is secured to the inner surface of the other leg, with its center aligned with the bore axis. A shaft engages the sleeve, with a front non-magnetic portion extending through the bore into the space between the legs and with a rear magnetic portion extending outwardly from the outer surface of the one leg. Another disc parallel to the one disc is secured to the front end of the shaft. An elongated cylinder having a horizontal axis has at one end a magnetic element coupled to the rear end of the shaft. Manual rotation of the cylinder causes the shaft to rotate. A helical hollow conduit in the outer cylinder surface has an axis coincident with the cylinder axis. A sphere in the conduit cooperates with a calibrated scale along the conduit to measure the extent of cylinder rotation.
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