US877335A - Mechanical perpetual calendar. - Google Patents

Description

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.110. 877,335. PATENTED JAN. 21, 1908.

MECHANICAL PERPETUAL CALENDAR.

APPLICATION FILED DEG. 29.1906.

2 SHEETSSHEET 2.

I90! to 2000 F l G3- ea-Q2 Mr PATENT OFFICE.

MECHANICAL PERPETUAL CALENDAR.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed December 29. 1906. Serial No. 349-928.

To all whom it may concern:

Be it known that 1, JAMES 'SINCLAIR HErrHERsAY, a subject of the King of Great Britain and Ireland, residing at 59 South Terrace, Adelaide, State of South Australia,

Commonwealth of Australia, have invented a certain new and useful Improved Mechanical Perpetual Calendar, of which the following is a specification.

This calendar consists of three plates or disks united by a central pivot pin, all of said plates or disks carrying printed matter and erence to the accompanying drawings in.

which Figure 1 shows the calendar set for the months of September and December of the years 1905, 1922, 1939, 1972, and 1989'. Figs. 2, 3 and 4 show the several plates or disks separately.

Fig. 2 represents what may be called the fixed or main plate'A. This plate has in addition to the central hole for the pivot pin, two openings B and C, and bears upon its face the names of the months with the numbar of days in each arranged around portion of the upper edge of the opening C. Immediatelyadjacent to the opening B are the words Set for years and the remainder of the surface may be utilized to display advertising matter. The opening B is of the requisite shape and size to permit the number of the year required (printed on the disk K) to be read. The opening C is are shaped with projecting slots at the lower ends.

Fig. 3 re resents the front rotatable disk D. This disk has in addition to the central hole for the pivot pin, three openings E, F and H, and bears upon its face the numerals 1 to 31, arranged around portion-of the lower edge of the opening F. Immediately adjacent to the opening E are the words Set formonth, and immediately around the upper edge of the opening F are the Words Years and months (Jan. Feb.) printed in red are for leap year only. The opening E is of the requisite shape and size to permit the names of the months (printed on the plate A) to be read. The opening F is are shaped and of sullicient extent to permit the names of seven days of the week (printed on the disk K)' to be read simultaneously. The opening H is also are shaped and very narrow, its purpose being to ma e a tongue of the central portion of the disk.

. Fig. 4 represents the back rotatable disk K. This disk has no opening except that for the central pivot pin, but it bears upon its face, in a circular table, the numbers of the years for which the calendar is designed to be used and also, in a circle, the names of the days of the week repeated three times. I

This calendar may be made .to apply to any number of years without any alteration to the main plate and the front rotatable disk, the only alteration necessary being in the printed matter upon the back disk which bears the numbers of the years. In the illustration this disk bears the numbers from 1901 to 2000. It might for instance be made to cover the years 1901 to 1925 or any other set of years desired.

The three parts of the calendar are put toether thus. The disk D is placed upon the ont of the plate A and its lower edge slipped down under the tongue or central part of the plate A, but the tongue or central part of the disk is kept over the tongue of the plate. The disk K is placed at the back and the three parts connected by a rivet or other ivot in. The movement of the disk D is imite by the ends of the are shaped 0 ening H coming against the lower edges 0' the opening C in the plate A.

In order to use the calendar, the back disk is rotated until the year required shows through the opening B at the top of the main plate A, the intermediate disk D is then rotated until the month required shows through the opening E in the front rotatable disk and the calendar is then ready for use.

The leap year numbers and the months of January and February for the same are indicated on the drawings by dotted figures and letters. In the actual calendar they may be indicated by a distinctive colored ink or the Words Leap year may be printed beneath and a disk having an opening, an arc-shaped openingbelow the-first nahied and.

' a second arc-'shaped'opening fonn' nga o'w'nwardly P ject g al o e; th o r. portionof the (118k? extending throu' h-the 5v arc-' haped opening'of the latea'nd a'ving its tongue projecting over t e. tongue of the said plate and pivoted thereto. i a

2'. A perpetual calendar; comprising" a! plate havin 'the names of the months with the numbers of days in each month produced thereon and provided with an o ening and below said opening an arc-shape opening, said arc-shaped opening having downwardly and outwardly projecting extensions at its ends and forming a central upwardly projecting tongue, a disk having numerals 1 to 31- pro uced thereon and provided with an opening, an arc-shaped opening below the first named opening, and a secon arc-shaped 20 opening forming a downwardly projecting oven the tongu 'forate}disk' at the back-of the plate and hav- 1 e, thealqw nportion-ot-th disk r ug 1 19 ar -vs ap p ning 2 P a d5 t Q proiee efof the-jsaid'p ate, an imporin t 'e number-ofthe years for which the ca endar-is used and the names ofthe days of the week repeated three times produced thereon, and a pivot passingft ough the 1 said disk and the tongues of the plate and the first named disk. I

In testimon :that I claim the foregoing as my invention have signedmy name in the presence of two subscribing witnesses this twenty-firstday of November 1906.

JAMES SINCLAIR HEITHERSAY.

Witnesses:

ARTHUR GORE COLLISON,' LESLIE HERBERT BROADBENT.

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