Perpetual mechanical calendar

Details Perpetual mechanical calendar Perpetual mechanical calendar

1990-11-19

1995-10-17

Brown, Peter R.

Card, picture, or sign exhibiting

Calendars

Charactered slide

40488, 49128, 74 8912, G09D 310

Patent

active

054579031

ABSTRACT:
A perpetual mechanical calendar is disclosed which includes a front board having twelve windows, a sliding plate mounted behind the front board and being printed with two series of numbers, portions of which are visible through the windows of the front board, a rack and gear assembly for horizontal adjustment of the sliding plate relative to the front board, and lever assemblies for vertical positioning of the sliding plate relative to the front board. The sliding plate can be horizontally moved between seven different positions corresponding to years which begin on each day of the week. Additionally, the sliding plate can be raised and lowered to display a series of numbers which corresponds to the proper calendar for standard years in one setting and leap years in the other.

REFERENCES:
patent: 1401385 (1921-12-01), Windahl
patent: 1668280 (1928-05-01), Maschmann
patent: 1869066 (1932-07-01), Vonder Lippe Lipski
patent: 3986405 (1976-10-01), Hatch
patent: 3995862 (1976-12-01), Bertin
patent: 4251935 (1981-02-01), Wright
patent: 4669219 (1987-06-01), Tomida

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