Geometrical instruments – Area integrators – Electrical
Patent
1974-10-07
1978-05-30
Stephan, Steven L.
Geometrical instruments
Area integrators
Electrical
33125M, 33141F, B23Q 1702, G01B 300
Patent
active
040915417
ABSTRACT:
A linear measuring system for precisely measuring distances along a rather long measurement axis. The apparatus includes an endless measuring cable which is held under tension between a metering drum at one end of the system and an idler drum at the other end. The measuring cable is wrapped around a groove, which has a semicircular cross sectional shape, on the circumference of the measuring drum, and is wrapped similarly around the idler drum. The cable is coupled to an object, the movement of which is to be measured, and movement of the object results in linear movement of the cable and rotational movement of the metering drum. A rotary encoder, which produces a digital output signal, is coupled to the metering drum to measure linear movement of the object. The accuracy of the measurement depends upon maintaining a constant measuring diameter of the metering drum and the measuring cable, and also upon maintaining a tight frictional bond between the measuring cable and the metering drum. This is accomplished by utilizing a measuring cable which has a diameter slightly larger than the diameter of the semicircular groove in the metering drum, and further having a flexible cross sectional area such that when the cable is placed in the groove under tension it flows into the groove to maintain a constant measuring diameter and also to form a tight frictional bond between the cable and the groove.
REFERENCES:
patent: 198451 (1877-12-01), Deutsch
patent: 676797 (1901-06-01), Miller
patent: 720143 (1903-02-01), Hildreth
patent: 1492320 (1924-04-01), Copeland
patent: 2180065 (1939-11-01), O'Brien
patent: 2274512 (1942-02-01), Weimer
patent: 2661231 (1953-12-01), Caldwell
patent: 3449833 (1969-06-01), Dzula
patent: 3611819 (1971-10-01), Muller et al.
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
Nathans Robert L.
Stephan Steven L.
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