Perpetual calendar

A perpetual calendar is provided having a frame defining an enclosure with a frontal portion provided with first indicia representing days of a week, and, within the enclosure, seven prisms removably mounted in said frame, and provided with second indicia located beneath said first indicia representing days of a month.

BACKGROUND OF THE INVENTION 
The present invention refers to a perpetual calendar, for the use 
preferably on desks of offices, and which presents a particular 
constructive disposition, such as will be explained in the following 
description. 
SUMMARY OF THE INVENTION 
In accordance with the invention, said perpetual calendar comprises a 
vertical support, provided below with an extension, which forms its 
bearing surface. This support is formed by two lateral vertical prismatic 
members, erected parallelly and backed by a posterior plate, which forms, 
together with a transparent frontal sheet, a rectangular flattened 
parallelopiped, with its top side opened. The frontal transparent sheet 
has near its upper edge, a line of indicia denoting the week's days. 
Within the parallelopiped, are introduced seven long prisms of a square 
section, showing on their lateral sides several numbers, forming a column 
and corresponding to some days of the month. These long prisms are located 
closely next to each other in the described lodging, and the length of 
each of the seven juxtaposed prisms corresponds to the length of the 
lodging, while the combined width of their equal sides, corresponds to the 
width of the lodging and, therefore, once located in their places, they 
rest duly immobilized inside of the mentioned lodging. 
For being supported on the desk, the lower end of a lodging is provided 
with a curving leading to an extensive horizontally directed plate, which 
forms a support, together with the curviform extension of the posterior 
backing plate.

SPECIFIC DESCRIPTION OF A PREFERRED EMBODIMENT 
As regards the drawings - 1 indicates the calendar's support, provided on 
each of its sides by the straight upright members 2 and 3, parallel in 
part with them, backed and connected to a rectangular plate 4. 
On the front side of the mentioned lateral members, a transparent sheet 5 
is fixed with screws; on the top part of this sheet 5, near its upper 
edge, are engraved the names or the abbreviations of the seven weekdays. 
Between the backing plate 4 and the frontal transparent sheet 5 is formed 
an enclosure 7 having a shape of rectangular flattened parallelopiped, 
which comprises the lodging for locating the corresponding series of long 
rectangular prisms 8, (seven in total), on which lateral sides are 
engraved the columns of numbers, indicating the days of the month. 
As it can be observed in FIG. 4, said prisms 8 are located next to each 
other -- in juxtaposed relation -- filling all the space of the enclosure 
7, because the length of same is practically equal to the length of each 
of the seven square sections of the prisms 8 and its width is equal to a 
combination of the widths of a single side from each of the prisms 8. 
For securely footing the body 1 of the support, its lower zone is extended 
in a curve leading to a bearing plate 9, which, for better stability, 
extends to the end of an extension 10 of the rear backing plate 4. Said 
bearing plate 9, apart from being a good support, can also be used for 
supporting writing utensils. 
The numbers engraved on the faces of the long prisms 8, are disposed 
differently on each prism, in such a way that the prisms can be duly 
located every month, in order that the engraved numbers indicate correctly 
the corresponding week's days, marked on the transparent sheet 5. 
It is evident that the modifications of details can be introduced in the 
calendar, if they are forming part of the scope of the present invention, 
which is clearly determined by the clauses of the claims, which are 
following the present description.