Two speed manual preset timer

Details Two speed manual preset timer Two speed manual preset timer

1975-02-03

1976-11-23

Gerin, Leonard H.

Machine element or mechanism

Gearing

Varying speed ratio

74435, 317141R, F16H 3502, F16H 5504, H01H 4718

Patent

active

039929604

ABSTRACT:
A two speed manual preset timer in which the cam shaft is driven by a pair of constantly meshing gears having two mating segments of different but constant pitch radii. One pair of segments gives relatively high shaft speed in a sector of the timing range adjacent the OFF position for accuracy in short timings. The other pair of segments gives relatively slow shaft speed in a sector at the other end of the timing range for long timings. The segments of the gears are joined by transition segments of varying pitch radii, providing a sector of varying shaft speed between the short timing and long timing sectors.

REFERENCES:
patent: 1902508 (1933-03-01), Kearsley
patent: 2261723 (1941-11-01), Hoffman
patent: 3098399 (1963-07-01), Berthiaume

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