Compact speed reduction mechanism for a uhf indicator dial

Details Compact speed reduction mechanism for a uhf indicator dial Compact speed reduction mechanism for a uhf indicator dial

1974-11-20

1976-01-13

Scott, Samuel

Machine element or mechanism

Shaft operators

Plural speed

74 1052, 74 108, 74804, F16H 3518

Patent

active

039317439

ABSTRACT:
A compact speed reduction mechanism for driving a tuning indicator dial of a UHF television tuner or the like includes a harmonic drive unit having a rigid fixed spline and a movable flexible spline member. The indicator dial is mechanically coupled to the flexible spline member and a wave generator is attached to the selector shaft. The number of teeth on each spline is selected to give approximately a 7:1 reduction ratio between the selector shaft and the indicator dial. More teeth are provided on the flexible spline than the rigid spline to prevent binding between the splines which normally occurs when reduction ratios of less than approximately 20:1 are used.

REFERENCES:
patent: 2968958 (1961-01-01), Kennedy et al.
patent: 3214984 (1965-11-01), Wallbreck et al.
patent: 3385116 (1968-05-01), Carlson et al.
patent: 3444760 (1969-05-01), Claxton et al.
patent: 3447385 (1969-06-01), Humphreys
patent: 3496782 (1970-02-01), Carlson et al.
patent: 3844176 (1974-06-01), Valdettaro

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