Two-speed timer

Details Two-speed timer Two-speed timer

1981-03-12

1983-11-29

Scott, J. R.

Electricity: circuit makers and breakers

Retarded

Clock train

200 38R, H01H 4310

Patent

active

044182538

ABSTRACT:
A two-speed timer in which both long and short timing periods can be set with only a moderate force imposed upon a time set shaft. The time set shaft is engageably coupled to a reduction gear train which is coupled to be rotated by an electric motor. A disc having a single engagement tooth portion at a predetermined position on the circumferential portion thereof is mounted on the time set shaft. A driven gear cooperating with the engagement structure has a change-over surface formed at an upper end thereof. A speed change gear is positioned on the same shaft upon which the driven gear is rotatably mounted and is urged into contact with the change-over surface. The speed change gear engages with a selected gear portion of the reduction gear train in dependence upon the rotational position of the driven gear so as to vary the rotational speed of the set shaft.

REFERENCES:
patent: 3991289 (1976-11-01), Weber

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