Moon phase display clock

Details Moon phase display clock Moon phase display clock

1986-06-19

1987-09-08

Miska, Vit W.

Horology: time measuring systems or devices

Astronomical

With moon and earth display

G04B 1926

Patent

active

046920315

ABSTRACT:
A clock for indicating moon phase comprises a moon phase dial fixed to a hub rotatable around an axle for indicating the moon phase according to the angular position thereof relative to the axle. The moon phase dial has a set of circumferentially spaced peripheral projections manually engageable during correction of the angular position thereof. A moon phase gear is slideably disposed around the hub and is driven to continuously rotate around the axle at a rotation period related to the moon phase period. A slip mechanism is disposed between the moon phase dial and the moon phase gear and frictionally engages between the face of the moon phase gear which is opposed to the moon phase dial and the periphery of the hub. The slip mechanism is operative during the correction of the angular position of the moon phase dial for decoupling the moon phase gear from the hub so as to enable the moon phase dial to rotate independently of the moon phase gear, and operative during the normal operation of the clock for coupling the moon phase gear to the hub so as to enable the moon phase dial to continuously rotate in response to the rotation of the moon phase gear.

REFERENCES:
patent: 1187110 (1916-06-01), Olsen
patent: 1997511 (1935-04-01), Canepa
patent: 2359458 (1944-10-01), Amend, Jr. et al.
patent: 3731083 (1973-03-01), Jauch
patent: 3815353 (1974-06-01), Wuthrich et al.
patent: 3837161 (1974-09-01), Wuthrich
patent: 4548512 (1985-10-01), Erard

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