Perpetual calendar mechanism comprising a four year cycle indica

Details Perpetual calendar mechanism comprising a four year cycle indica Perpetual calendar mechanism comprising a four year cycle indica

1984-08-15

1985-09-17

Miska, Vit W.

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

G04B 1924

Patent

active

045417253

ABSTRACT:
The perpetual calendar mechanism of the invention comprises in addition to the months indicator a four year cycle indicator which displays successively the normal years and the leap-year. The four year cycle indicator is controlled directly or indirectly by a rotatable assembly journalled on the month star such assembly including a year cam and a Maltese cross enabling it to effect one revolution every four years. In one variant illustrated the mechanism includes a first ring bearing the year indications and a second ring concentric to the first ring bearing an index marker. At each year change the index marker is shifted a quarter turn relative to the indications borne by the first ring.

REFERENCES:
patent: 3628322 (1971-12-01), McDuffee
patent: 4427300 (1984-01-01), Groothuis
B. Humbert, "Modern Calendar Watches", Edition Scriptar S.A., Lausanne (Switzerland) 1954, pp. 41-42.

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