Manufacturers Index - AB. C. E. Johansson
AB. C. E. Johansson
Eskilstuna, Sweden
Manufacturer Class:
Metal Working Machinery
This page contains information on patents issued to this manufacturer.
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SE-17,017
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Jan. 30, 1904
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Mattsats för Precisionsmattagning
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Carl Edvard Johansson |
Eskilstuna, Södermanland County, Sweden |
This is the original patent for "Johansson gauge blocks", which are very precise, flat and smooth blocks that can be "wrung together" so that they stick to one another to form a precise reference for measurement and calibration. Jo blocks are still used today and are only exceeded for accuracy by modern methods such as optical interferometry.
Johansson formed C. E. Johansson AB in 1911 to manufacture his gauge blocks. In 1918 he formed C. E. Johansson, Inc., in Poughkeepsie. In 1923, Henry Ford acquired that company and moved it to Dearborn, At that time Johansson moved to the USA to work directly for Ford. In 1936, at age 72, Johansson retired and moved back to Sweden. |
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1,334,955
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Mar. 30, 1920
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Indicating Device for Measuring Apparatus and Measuring Tools
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Carl E. Johansson |
Eskilstuna, Södermanland County, Sweden |
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Indicating Device for Measuring Apparatus and Measuring Tools
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Frans G. H. Sjökvist |
Eskilstuna, Södermanland County, Sweden |
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2,033,318
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Mar. 10, 1936
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Indicator gear for measuring instruments and the like
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Hugo Abramson |
Lidingo, Sweden |
This patent is the genesis of the Mikrokator. For more on this high-precision measuring device see our notes on a subsequent improvement, patent 2,900,732. |
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FI-22,437
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Oct. 10, 1947
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Tryckdyna för anordningar för mätning av krafter
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Hugo Abramson |
Eskilstuna, Södermanland County, Sweden |
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CA-454,119
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Jan. 18, 1949
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Pressure pad for apparatus for measuring forces
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Hugo Abramson |
Eskilstuna, Södermanland County, Sweden |
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2,536,117
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Jan. 02, 1951
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Pressure pad for apparatus for measuring forces
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Hugo Abramson |
Eskilstuna, Södermanland County, Sweden |
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2,799,092
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Jul. 16, 1957
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Instrument for measuring holes
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Hugo Abramson |
Eskilstuna, Södermanland County, Sweden |
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CA-558,858
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Jun. 17, 1958
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Indicator device for measuring instruments
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Hugo Abramson |
Eskilstuna, Södermanland County, Sweden |
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2,900,732
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Aug. 25, 1959
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Indicator device for measuring instruments
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Hugo Abramson |
Eskilstuna, Södermanland County, Sweden |
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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