Geometrical instruments – Area integrators – Electrical
Patent
1981-12-29
1984-01-31
Little, Willis
Geometrical instruments
Area integrators
Electrical
G01B 322
Patent
active
044281218
ABSTRACT:
A test indicator is disclosed wherein a rotational displacement value of a measuring element is enlarged and transmitted by a sector gear supported on a main body of the test indicator to an indicating device, and the aforesaid sector gear is urged in two rotational directions opposite to each other by two springs so that the sector gear can be held at the neutral position.
The two springs for urging the sector gear are previously differentiated in resiliency from each other so as to provide two springs, one being stronger and the other weaker in resiliency, and the stronger spring is abutted thereagainst with a spring-load finely adjusting means positionally adjustably supported on the main body of the test indicator in the urging direction of the spring from the side of resisting the resilient force of the spring, whereby this spring-load finely adjusting means is adjusted in its position to vary its resilient force, so that the sector gear can be adjusted in position.
REFERENCES:
patent: 1649197 (1927-11-01), Senchak
patent: 2115955 (1938-05-01), Johnson
patent: 2129311 (1938-09-01), Street
patent: 2308207 (1943-01-01), Reinhard
patent: 2341809 (1944-02-01), Pearson
Little Willis
Mitutoyo Mfg. Co. Ltd.
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