Two-speed constant drive timer

Claim 1

A two-speed timer including a frame, a timing cam rotatably mounted in the frame, a motor mounted in the frame and having a drive pinion, a slow speed gear train having an input gear driven by the drive pinion and including an overrunning clutch having an input and an output and located at the input to the gear train with the clutch input driven by said input gear and the clutch biased into engagement with the clutch input with an overrunning ratchet drive between the clutch input and output so the clutch output overruns the clutch input if rotated faster than the clutch input, a selectively operable high speed clutch including an input and an output and having its input continuously driven by the pinion, said high speed clutch output being rotatably mounted on the frame and axially movable on its rotational axis into engagement with the high speed clutch input, a coil spring acting between the frame and the high speed clutch output biasing the high speed clutch output into engagement with the high speed clutch input, a beam-type spring mounted on the frame and bearing on the high speed clutch output and operative to overcome said coil spring to move the high speed clutch output out of engagement with the high speed clutch input, a lever pivoted on the frame and manually movable from an inoperative position to an operative posiTion in which it acts on the beam-type spring to move it to an inoperative position whereby the high speed clutch is engaged, said high speed clutch output including a gear driving a high speed gear train, the output of both gear trains driving a common gear operatively connected to the timing cam whereby the slow speed gear train drives back to the overrunning clutch output during operation of the high speed drive.