US 4,393,611 A · Perpetual calendar

Abstract

An improved permanent calendar assembly is disclosed which is to display any month of any year. The construction includes a flat main body with forwardly protruding tracks for removable mating with date columns. For flexibility of display, end pieces carrying one of the dates "29", "30" and "31" on one surface and a blank on an opposed surface are rotatably or pivotally mounted at the bottom of the date columns so that either side of any of the end pieces may be selected for display. The calendar also features a construction that allows easy removal and rearrangement of the vertical date columns and yet prevents their disengagement when, for example, when the calender is tilted forward. At least one lipped horizontal track extends across the rear of the date column area. Defined in the back wall of each date column are at least two openings or grooves that can mate with the track, as desired. The lip results in a track with surfaces facing in more than one direction and particularly with an engaging surface which has a surface that mates with an opposed surface in each date column groove when the calendar is tipped forward to prevent the date column from falling.

Claims10

Dependent claims

An improved permanent calendar assembly to precisely display any month of the year and reflect the number of days in the desired month, said assembly having a date column area, a plurality of date columns, and means to detachably secure said colunns to said date column area, the improvement comprising:

at least one reversible mounting structure secured at the lower end of a respective one of said date columns for rotation about an axis extending along said column;
a pair of opposed surfaces on said mounting structure, a rear surface being unnumbered, the other surface defining a front surface having thereon a numberal representing the date of a day of the month;
and
a lug on one of said mounting structure and said one date column extending toward the other of said mounting structure and said one date column;
said other of said mounting structure and said one date column having openings on opposite sides of said axis extending thereinto and through the rear thereof, each opening being dimensioned to receive said lug freely therein, but having a protrusion near the rear of said other of said mounting structure and said one date column positioned to interfere with the movement of said lug into said opening, whereby said mounting structure may be rotated to force said lug through the rear portion of one of said openings so that said lug is retained in said one opening.

2 more elements

Dependencies are inferred from the claim text.

Perpetual calendar

Life of this patent

Perpetual calendar

Life of this patent

Abstract

Claims10