Friction detent to permit setting of digital clock

Details Friction detent to permit setting of digital clock Friction detent to permit setting of digital clock

G - Physics

04

B

58/33

G04B 27/08 (2006.01) G04B 19/02 (2006.01) G04B 19/21 (2006.01)

Patent

CA 1055259

ABSTRACT OF THE DISCLOSURE This invention relates to apparatus for setting digital clocks. In prior art types of digital clocks, the friction clutches used often result in damage to the n ormal drive mechanism. In addition, proper indexing is often lacking which causes the numerals to be displayed im- properly centered vertically in the exposing aperture. The present invention overcomes both of these deficiencies. According to the invention, the minute drum is fixed to the drum shaft. A drive disc is carried on the shaft, freely rotatable thereon, adjacent to the minute drum. Sandwiched between them is a detent ring which is keyed to the drive disc, but which has limited axial freedom with respect to both the disc and the drum, being pressed toward the web of the drum by a spring. Convex detent bosses extending axially from the ring can engage with any of a plurality of recesses in the web of the minute drum. The drive disc is advanced each minute by the normal actuating mechanism, and drives the minute drum through the detent ring. A setting knob is engageable with the shaft, permitting rota- tion of the latter, and hence of the minute drum, for set_ ting purposes. In setting, the bosses are forced out of the recesses, the ring retracting axially, so that the drum can be rotated with respect to the ring. As a setting is completed, the bosses will drop again into recesses, thus indexing the drum to provide proper full-figure display of the numerals on its periphery.

239972

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