Tachometer

Details Tachometer Tachometer

1985-10-15

1987-01-06

Frankfort, Charles

Signals and indicators

Indicators

Scale structure

116 624, 116303, G01D 1302

Patent

active

046338039

ABSTRACT:
An instrument gauge is described of the pointer output type, especially a tachometer, that includes a display cover limiting observation of the pointer by a first window cut into the cover in the shape of a graphical representation of a proportional relationship between engine performance and revolutions per minute or vehicle speed. The window is oriented such that the pointer position indicates RPM or speed on a cover scale. Engine performance is indicated by the relative position of the pointer with respect to the curved shape of the window established by the proportional relationship. The cover includes a second window of such size and orientation that it permits observation of the pointer only when a critical RPM or speed is reached. A flag fixed to the pointer appears in the second window only at the critical value.

REFERENCES:
patent: 2450835 (1948-10-01), Lee, 2nd
patent: 2520028 (1950-08-01), Biskind
patent: 3276418 (1966-10-01), Harris
patent: 3440870 (1969-04-01), Leto
patent: 3921569 (1975-11-01), Miller et al.

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