Multi-scale indicator

Details Multi-scale indicator Multi-scale indicator

1986-08-05

1988-10-11

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340 59, 362 27, 362 30, 350112, G08B 2100

Patent

active

047774800

ABSTRACT:
A multi-scale indicator which has a main scale and a sub-scale is constructed so as to prevent a misreading between the main scale and the sub-scale. A sub-scale prism and the light source which illuminates only the sub-scale are light insulated from the main scale prism and the light source which illuminates the main scale, due to the sub-scale prism being securely buried within a circular arc shaped prism receiving groove which is formed on the main scale prism. Light opaque paint is spread between the main scale prism and the sub-scale prism to prevent the occurrence of light leakage therebetween. Also provided is an electrical control for supplying a light to the sub-scale prism only when the pointer is moved to a predetermined zone located on the end of the main scale.

REFERENCES:
patent: 2837052 (1958-06-01), Viret
patent: 3264769 (1966-08-01), Hardesty
patent: 3590773 (1971-07-01), Ruppert
patent: 4004546 (1977-01-01), Harland
patent: 4174500 (1979-11-01), Kuga
patent: 4258643 (1981-03-01), Ishikawa et al.
patent: 4321655 (1982-03-01), Bouvrande

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