Title: Compact speed reduction mechanism for a uhf indicator dial

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.

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Other info:

Inventors: Valdettaro, Alarico A. (Bloomington, IN, US)

Application Number: 525354
Filing Date: 1974-11-20
Publication_date: 1976-01-13
Assignee: Sarkes Tarzian, Inc. (Bloomington, IN)
Primary Class(es): 74/10.54 74/10.52, 74/10.8, 74/640
Other Classes:
US Patent Ref:

2968958	Jan, 1961	Kennedy et al.	74/824.
3214984	Nov, 1965	Wallbreck et al.	74/10.
3385116	May, 1968	Carlson et al.	74/10.
3444760	May, 1969	Claxton et al.	74/10.
3447385	Jun, 1969	Humphreys	74/10.
3496782	Feb, 1970	Carlson et al.	74/10.
3844176	Jun, 1974	Valdettaro	74/10.

Other Refs:
Primary Examiner: Scott, Samuel
Assistant Examiner: Heald, Randall
Attorney: Mason, Kolehmainen, Rathburn & Wyss