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Publication numberUS3531885 A
Publication typeGrant
Publication dateOct 6, 1970
Filing dateJul 1, 1968
Priority dateJul 1, 1968
Publication numberUS 3531885 A, US 3531885A, US-A-3531885, US3531885 A, US3531885A
InventorsDablo Cesar M
Original AssigneeDablo Cesar M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Perpetual pen calendar
US 3531885 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Oct. 6, 1970 f c. M. DABLo PERPETUAL PEN CALENDAR 2 Sheets-Sheet 1 Filed July l, 1968 FIG. 3

FIG. 4

CESAR M. DABLO JUNE ' SEPT DEC Imi APRJUL I4 31eme 2 le l5 @658299 3 @496683 FEBMARNOV SB 4 ls mas so e1 ol lsaslas 02:9@6986 /NVENTOR 2 Sheets-Sheet 2 Filed July 1, 1968 @MTW-VFS a EE@ E CESAR M. DABLO AGENT United States Patent O 3,531,885 PERPETUAL PEN CALENDAR Cesar M. Dablo, Los Angeles, Calif. (6637 Whitsett Ave., North Hollywood, Calif. 91606) Filed July 1, 1968, Ser. No. 741,715 Int. Cl. G09d 3/06 U.S. Cl. 40-335 4 Claims ABSTRACT OF THE DISCLOSURE A juxtaposed ring and sleeve are rotatably mounted on a cylindrical base member. A window is formed in the sleeve. The peripheries of the base, ring and sleeve contain letters and numerals denoting calendar information systematically arranged so that calendar dates may be obtained by rotating the ring and sleeve to a predetermined setting to reveal days of the month through the window.

Background of the invention The present invention relates to calendars and more particularly to a device having calendar information printed thereon to form a perpetual calendar.

Many reference calendars have been proposed, some of which have appeared in publication usually in columnar or chart form, for determining calendar dates of past or future years. However, most of these charts for calendars are of limited range and are not relatively easily used. In using such calendars it is usually necessary to follow lines or columns in order to match data a plurality of times which frequently results in errors as well as being a tedious procedure. The inconvenience of cross referencing of information has prevented this type of calendar from being generally accepted. Furthermore, this type of calendar usually require reference to and the following of a set of instructions.

The present invention eliminates the inconvenience of reading and following instructions and matching cross referenced data by incorporating the calendar information into a compact tubular form which may be mounted on or formed with a writing pen.

A pen-type calendar is disclosed by the patent to P. S. Hauton No. 1,439,736. However, this calendar is only for a selected seven year duration. Similarly, the patent issued to E. C. White No. 1,571,828 is for limited use in that the user selects the particular or current month desired.' This calendar cannot be used for determining the day of the week of past or future dates. My invention, on the other hand, supplies all information in the form of dates and letters necessary to obtain any date of the Christian era from the year l to 2099 which also compensates for the change from the Julian to the Gregorian calendar. Furthermore, incorporating the calendar with a pen eliminates the book, pamphlet or other media on which the calendar is printed which is not usually as conveniently carried. A calendar arranged in accordance with my invention may be easily and quickly used, is accurate over a Wide range of years and eliminates the necessity of memorizing or keeping available a set of rules or instructions for obtaining calendar information.

Another type of multi-year calendar is the 100 year calendar usually printed in circular slide rule fashion wherein available space for printing the numerals of each year limits the coverage of the calendar.

Summary of the invention This invention employs a cyclindrical base member, preferably a tube, which surrounds and is held by the respective body end portions of a fountain pen, or the like. A juxtaposed ring and sleeve surround one end por- 3,531,885 Patented Oct. 6, 1970 tion of the base member. One end of the base member has imprinted thereon numerals indicating the century years of the Christian era (l to 2099) selectively arranged and equally spaced circumferentially in twentyone locations. The opposite end portion of the base mem,

ber is provided with a circumferentially extending repeating series of the days of the month arranged in circumferential rows inclined with respect to the longitudinal axis of the base member and forming twenty-one equally spaced longitudinally extending rows.

The sleeve, overlying these dates of the month, is provided with a window exposing the days of a selected month with the days of the week printed at one side of the window and the months of the year selectively arranged in seven longitudinally equally spaced-apart rows at the opposite side of the window. The ring has the last two digits of the year, 1 through 99, printed thereon and circumferentially arranged in twenty-one equally spaced rows with every seventh row having a month selecting symbol such as an arrow. The last two digits of leap years are preferably printed in red and the leap year affected months of January and February are similarly printed in red, a different case or otherwise distinguished from the same months of intervening years.

By dividing calendar information into four separate portions, which are respectively printed in ring-like fashion on the base member and surrounding ring and sleeve, it is possible to isolate the dates from the months, the months from the last two digits 0f the year and the last two digits of the year from the century thus considerably reducing the amount of printing and permitting such compact arrangement. Thus a desired century may be obtained by matching the last two century digits with the century desired by manual rotation of the ring. Positioning the selected month in alignment with one of the arrows, on the ring, will reveal the dates of that month within the window.

It is, therefore, the principal object to provide a perpetual calendar in the form of tubular members which may be assembled with and form a portion of a pen.

The window in the sleeve is of such size that only onethird of the circumference of the base member appears therein and hence only the face of one calendar month appears in the window at any given setting. Furthermore, the grouping of the months of the year has been arranged so that the monthly calendar phase classifies and groups the twelve months into seven groups to cooperate with the seven days of the week with compensation for leap year being provided as pointed out hereinabove.

The century section compensates for the calendar change from the Julian style to the Gregorian style by printing the seventeenth century numerals as 171 and 172.

Brief description of the drawings FIG. 1 is a perspective view of a pen having the device mounted thereon;

FIG. 2 is an exploded perspective view, to a larger scale, illustrating the parts on which the calendar information is to be printed;

FIG. 3 is a fragmentary longitudinal cross-sectional view, to a larger scale, taken substantially along the line 3-3 of FIG. l;

FIG. 4 is a fragmentary elevational view illustrating the manner of using the calendar information; and,

FIGS. 5, 6 and 7 are development views, to a larger scale, of the three parts shown by FIG. 2 and illustrating the relative position of calendar information when printed thereon.

Description of the preferred embodiment Like characters of reference designate like parts in those figures of the drawings in which they occur.`

In the drawings:

The reference numeral indicates a substantially conventional pen on which the present invention is mounted so that the respective parts of the device may be easily manipulated. In its preferred form the device 12 comprises a tubular base member 14 of a selected length having a diametrically enlarged ring or annular shoulder 16 at one end portion. A tubular ring 18 surrounds the member 14 adjacent the shoulder 16 while a sleeve 20* rotatably surrounds the remaining end portion of the base 14.

Referring to FIG. 3, the pen 10 is divided intermediate its ends to form a bottom section 21 and a top section 22 which are interconnected by threads 24. The periphery of the pen sections 21 and 22 are provided with a circumferential recess 26 dimensioned to cooperatively receive the base member 14 having the ring 18 and sleeve installed thereon. The pen 10 preferably holds the calendar base member 14 stationary. The tolerance between the base member 14 and the ring 18 and sleeve 20 is preferably such that the ring and sleeve may be manually rotated with respect to the base 14 with sufficient friction present to prevent unauthorized movement of either the ring or sleeve. Oher means for maintaining seleced positions of the ring and sleeve with respect to the base member may be used if desired, such as the well known spring and ball entering a series of recesses or sockets, not shown, which index the rotative movement of the ring and sleeve. The diameter of the base member 14 may be selected for the particular size pen for which it is to be used and is not critical but the relationship of the calendar information printed thereon and on the ring and sleeve must be maintained as hereinafter explained.

Alternatively the calendar device 12 may be formed as a separate unit wherein the base member 14 may be a cylinder instead of tubular and cooperatively receiving the ring and sleeve.

The annular shoulder 16 has printed thereon the gures denoting the century years of l through 20. These numerals are spaced, and grouped, around the periphery of the shoulder 16 in twenty-one equally spaced-apart positions with the numeral 17 denoting the seventeenth century repeated once and designated 171 and 172 for distinguishing between and compensating for the change and loss of days in adjusting the calendar from the Julian to the Gregorian in the manner hereinafter explained.

The other end portion of the base 14 has printed thereon the numerals, indicating a calendar month from 1 to 31, repeated three times in juxtaposed relation around the circumference of the base member by repeating the numeral 1 every eighth line wherein the normally vertical rows of the calendar dates are equally spaced-apart to form twenty-one rows around the base member parallel with the axis of the pen. The days of these three calendar months are arranged in circumferentially extending spiral lines around the periphery of the base member 14 similar to the pitch of a triple thread machine screw. Obviously, any number of rows of month days may be used if they are multiples of seven to correspond to the seven days of a week.

As shown in FIG. 5, the rows of the calendar months are aligned with the century dates for example the numerals l, 8, 15, 22 and 29, are aligned in one instance with the numeral 3 denoting the third century while these same calendar dates of another month are aligned with l0 for the tenth century for the reasons readily apparent.

The intermediate member or ring 18 has printed thereon the last two digits indicating years from 1 through 99. These numerals are arranged in spiral sequence extending circumferentially of the ring 18 and grouped in twentyone circumferentially equally spaced-apart rows so that a selected pair of the last two digits of the years may be longitudinally aligned with the century designation on the shoulder 16. The last two figures of the year which are leap years are distinguished from the other or intermediate years by preferably printing these leap year numerals in red, however, other designations may be used such as a different type face or by boxing the two gures. Adjacent the edge of the ring 18, opposite the annular shoulder 16, three symbols such as arrowheads are printed on the ring 18 in equally spaced relation around the ring circumference with the respective symbol or arrowhead aligned with one of the longitudinal rows of year numerals. The purpose of these symbols or arrowheads is for the selection of a month as hereinafter explained.

The sleeve 20' is provided with a rectangular opening or window 30. Transversely the dimension of the window 30 is substantially equal to the length of one of the longer rows of calendar months 1 through 3l and longitudinally the length of the window encompasses the spacing between seven longitudinal rows of the calendar month dates. Stated another way, the longitudinal length of the window 30 is equal to one-third of the circumference of the underlying base member 14, thus the three months of the calendar dates printed on the base 14 appears three times in succession through the window 30` for one complete revolution of the sleeve 20. Along one side of the window indicia is imprinted indicating days of the week which are preferably abbreviated as S, M, T, W, T, F, S and equally spaced-apart in cooperative alignment with the longitudinal extending rows of the calendar month dates. The first S, indicating Sunday, is preferably printed in red or a distinctive type face. The twelve months of the year abbreviated in a conventional manner, are grouped according to the dates on which the respective months may begin and the groups are arranged in seven rows printed in equally spaced-apart relation parallel with the longitudinal axis of the base member and adjacent to the side edge of the window 30 opposite the week day designation. The months are thus adjacent the symbols or arrows printed on the ring 18. An extra January is added to the month grouping of April and July and similarly an extra February is added to the grouping of the month August. These two extra months, January and February, are preferably printed in red and, or a dilferent type face to indicate leap years which alters the length and beginning date, respectively, of these two months.

Operation The operation of the calendar can be best understood by following the steps necessary for locating any particular day, for example to nd the day of the week of Independence Day or July 4, 1776, hold the pen 10 with its writing tip to point toward the left. If the base member 14 is not held stationary by the pen it must be held manually. Rotate the ring 18 to match the numeral 76 with the century designation 172 on the shoulder 16. Rotate the sleeve 20 to align the month July with any one of the symbols or arrows on the ring 18. The calendar month dates then appearing in the window 30y indicates that the 4th of July that year fell on Thursday. Another example is shown by FIG. 4 where 67 has been aligned with 19 for the year 1967 with one of the arrows pointing to the month grouping February, March and November which reveals the dates of a month through the window 30 wherein these three months began on Wednesday. Obviously the user must know the length of the month, for example, February contained 28 days and November 30. This setting agrees with any calendar for these months of the year 1967.

The century 171 is elfective for all dates from Jan. 1, 1700 through Sept. 2, 1752 while the century designation 172 applies to all dates from Sept. 14, 1752 through Dec. 31, 1799. The 172 setting compensates for the eleven days lost or dropped in September 1752 when the Gregorian type calendar was adopted by England and the United States.

Obviously the invention is susceptible to some change or alteration without defeating its practicability, and I therefore do not wish to be confined to the preferred embodiment shown in the drawings and described herein.

I claim:

1. A perpetual calendar, comprising: a cylindrical base member having an annular shoulder at one end, said shoulder having numerals indicating century years printed thereon in equally spaced circumferential relation; a ring surrounding said base member adjacent said shoulder, Said ring having numerals indicating the last two years of a century printed therearound in cooperating spaced relation with respect to the century years numerals; and a sleeve surrounding the end portion of said base member opposite said shoulder, said sleeve having a window, said base member having a series of numerals, 1 through 31, indicating days of the month printed in equally spaced rows around its peripheral end portion opposite said shoulder in such order that any two aligned numerals in adjacent rows ditfer by seven, whereby calendar dates may be determined by manually rotating said ring and said sleeve to match calendar data.

2. Structure as specified in claim 1 in which the window in said sleeve is dimensioned to reveal the dates of a complete month, said sleeve having indicia printed thereon, at opposite sides of the window, indicating days of the week and months of the year respectively.

3. Structure as specied in claim 2 in which said base member is tubular for surrounding a writing instrument.

4. A calendar, comprising:

a cylindrical base member having an annular shoulder at one end,

said shoulder having a progression of numerals denoting a series of years printed thereon in cir- 30 cumferential equally spaced relation, the other end portion of said base member having a repeating series of numerals, 1 through 31, indicating days of the month printed in equally spaced rows around its periphery in such order that any two aligned numerals in adjacent rows differ by seven; and a sleeve surrounding the end portion of said base member opposite said shoulder,

said sleeve having a window exposing the days of one month, said sleeve having letters printed thereon, between said window and said shoulder, indicating months and arranged around an are of the sleeve in seven equally spaced-apart rows, each longitudinally alignable with the respective year numerals on said shoulder,

said sleeve having other letters printed along the side of said window opposite the months indicating days of the week.

References Cited UNITED STATES PATENTS 1,425,137 8/1922 Round 40-335 1,439,736 12/1922 Hauton 40-335 1,571,828 2/1926 White 40-335 1,695,539 12/1928 Draughon 40-335 EUGENE R. CAPOZIO, Primary Examiner L. R. OREMLAND, Assistant Examiner U.S. Cl. X.R. 40-114 October 6, 1970 Dated Patent No.

Cesar M. Dablo 1nventor(s) above-identified patent at error appears in the d as shown below:

It is certified th e hereby correcte and that said Letters Patent ar line 1,

DABLO each o the sheets of drawings e, should read C. M. drawings CESAR M. BABLO In the heading t "C. M. BABLO, each occurrenc 1ower right-hand side of the occurrence, should read CESAR Mn this 4th day of May. 1971 Signed and sealed (SEAL) Attest:

EDWARD M.FLETCHER,JR. Attesting Officer Commissioner of Patents WILLIAM E SCHUYLER, JR.

USCOMM-DC 60376-5369 FORM'PO-105O (iO-69) u.s4 savamment summe omet: no o

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1425137 *Dec 9, 1921Aug 8, 1922Round John JPerpetual calendar
US1439736 *Aug 23, 1919Dec 26, 1922Hauton CorpCalendar
US1571828 *Aug 3, 1925Feb 2, 1926 Emanuel c
US1695539 *Aug 11, 1923Dec 18, 1928Draughon William HCalendar
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3731415 *Feb 23, 1971May 8, 1973Souvenir Inc Cedar RapidsDesk appliance
US3810325 *Apr 17, 1972May 14, 1974Koper FMultiyear calendar
US5622441 *Jun 19, 1995Apr 22, 1997Lambert, Sr.; Raymond E.Writing instrument housing
US6742953May 20, 2002Jun 1, 2004Bic CorporationWriting instrument with display window
US7670143 *Jan 13, 2006Mar 2, 2010Innovative Premiums, Inc.Model for demonstrating pathological physiological conditions
US20060154229 *Jan 13, 2006Jul 13, 2006Innovative Premiums, Inc.Model for demonstrating pathological physiological conditions
U.S. Classification40/335, 40/114
International ClassificationB43K29/00, G09D3/06, B43K29/087, G09D3/00
Cooperative ClassificationB43K29/0875, G09D3/06
European ClassificationG09D3/06, B43K29/087C