US Patent: 2,900,732
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| Indicator device for measuring instruments
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Patentee:
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| Hugo Abramson (exact or similar names) - Eskilstuna, Södermanland County, Sweden |
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Patent Dates:
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| Applied: |
Dec. 30, 1954 |
| Granted: |
Aug. 25, 1959 |
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Jeff Joslin
Vintage Machinery entry for AB C. E. Johansson
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Description: |
| This invention is a very high precision distance measuring device, the Mikrokator as manufactured by C. E. Johansson. This device was reportedly first developed by Abramson in the late 1930s and this 1959 patent is for an improvement to the mounting of the twisted ribbon.The Mikrokator's mechanism has no slack or hysteresis, and is extremely low friction. Combined with its extreme sensitivity, the Mikrokator is capable of dizzying levels of sensitivity and they were manufactured in a range of resolutions. We have seen Mikrokator versions with resolutions from two ten-thousandths of an inch or about 5 μm, to as little as 2 one-millionths of an inch or about 50 nm (the very fine resolution versions were expensive and fragile and are quite rare). The range of each Mikrokator is about 30 times that of the resolution.The Mikrokator mechanism uses a twisted ribbon of metal that is fixed on one end and the other end is connected via a flexure mechanism to a probe akin to a dial indicator's probe. One end of a fine glass fiber is attached to the mid-point of the ribbon, and the other end of the glass fiber has a small pointer which shows its position on a scale. A slight movement of the endpoint of the ribbon will cause the ribbon to twist or untwist which moves the pointer. |
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