Geometrical instruments – Distance measuring – Environmental isolation
Patent
1991-09-26
1993-04-27
Will, Thomas B.
Geometrical instruments
Distance measuring
Environmental isolation
33705, 33706, G01B 702
Patent
active
052050491
ABSTRACT:
A length measuring apparatus comprises a measuring device for detecting the position of a marker along a measuring path. The measuring device and the marker are encapsulated in a hermetically sealed housing. A follow-up device is provided for moving the marker to a predetermined position of registration relative to a detectable point, which is disposed outside the housing and is movable along a path which is parallel to and laterally aligned with the measuring path. The follow-up device comprises a device for establishing a non-contacting link between the detectable point and the marker. To provide such an apparatus which has a relatively simple design and a low susceptibility to disturbance and can achieve a high accuracy of measurement. The apparatus comprises a strip that is trained around reversing end pulleys and has a course that extends along the measuring path. The marker is carried by the course. The strip is adapted to be driven by the follow-up device and is provided with a measuring scale and in the housing extends past a stationary reader for reading the measuring scale.
REFERENCES:
patent: 3658429 (1972-04-01), Zipin
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patent: 4070759 (1978-01-01), Nelle
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patent: 4777361 (1988-10-01), Affa
patent: 4818111 (1989-04-01), Affa
patent: 4908953 (1990-03-01), Walliser
Rieder Heinz
Schwaiger Max
RSF-Elektronik Gesellschaft m.b.H.
Will Thomas B.
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