Timepiece with a perpetual calendar mechanism

Details Timepiece with a perpetual calendar mechanism Timepiece with a perpetual calendar mechanism

1981-11-03

1984-01-24

Roskoski, Bernard

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

368 28, G04B 1924

Patent

active

044273002

ABSTRACT:
The mechanism comprises a date-disc (8) actuated at midnight by a lever (1) supporting a rotary part (3) with catches (3a) gearing with the wheel (4) of 24 h. The mechanism is so designed that each transition from a date to the next is effected in less than one hour so that the calendar remains still in synchronism with the hours hand, even in the case of the changing of the indication of time-zones. The disc comprises pins (14) controlling at the end of each month through a star-wheel (13) the rotation of a first (17) and a second (20) cam. The cams bear finger-pieces (17a,17b,21) the ones (17a,17b) of the first cam having variable widths according to the different lengths of the months forming bankings for a catch (9) of the lever (1) for hindering the return motion of this lever thus prolonging the duration of the gearing of the rotary part (3) with the disc (8). At the end of February of the normal years a finger-piece (17b) of the first cam (17) juxtaposes itself with a finger-piece (21) of the second cam (20) for causing the transition between the 28th of February and the 1st of March. This finger-piece (21) is missing in the leap years. The mechanism operates in the two directions of rotation of the wheel of 24 h.

REFERENCES:
patent: 387005 (1888-07-01), Nilson
patent: 527386 (1894-11-01), Feishtinger
patent: 2470692 (1949-05-01), Farr
patent: 3703805 (1972-11-01), Ganter et al.
patent: 3751901 (1973-08-01), Mentinger et al.
patent: 3939645 (1976-02-01), Charbonney
patent: 4194353 (1980-03-01), Thomi et al.
patent: 4234943 (1980-11-01), Teramoto et al.

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