US2239344A

US2239344A - Calculator

Info

Publication number: US2239344A
Application number: US288453A
Authority: US
Inventors: Robert L Sifrit
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-08-04
Filing date: 1939-08-04
Publication date: 1941-04-22
Anticipated expiration: 1958-04-22

Description

April 22, w41- R. L slFRx-r CALCULATOR Filed Aug. 4. les@ 2 Sheets-Sheet l joerfl. SP/ffii,

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2 Sheets-Sheet 2 R. L.. SIFRIT April 22, 1941.

GALCULATGR Filed Aug. 4, 1939 Patented Apr. 22, 1941 UNITED STATES PATENT OFFICE 4 Claims.

This invention relates to a new and useful device for calculating or determining the day when a menstrual period will begin, and the day fertility will begin and the day fertility will end with respect to said menstrual period, for a given menstrual cycle and where the day the previous menstrual period began is known.

The primary object of the present invention is to provide a calculator of the above kind by means of which the dates mentioned above may be rapidly and accurately ascertained in a simple and convenient manner.

Another object of the present invention is to provide a calculator of the above kind which is simple in construction, convenient to use, and economical to manufacture.

The present invention consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings:

Figure 1 is an elevational view of a calculator constructed in accordance with the present invention.

Figure 2 is a longitudinal sectional view thereof taken on line 2 2 of Figure 1.

Figure 3 is an elevational View of the inner cylinder.

Figure 4 is a transverse section on line 4-4 of Figure 1; and

Figure 5 is an enlarged fragmentary section on line 5--5 of Figure 1.

Referring in detail to the drawings, the present calculator comprises two concentrcally arranged cylinders and a sliding band or sleeve, the outer cylinder 5 being provided with three parallel lon.

gitudinal slots 6, l and 8 extending nearly from end to end thereof, and having a further short slot 9 at one end of the same. Also, arranged longitudinally upon the outer cylinder 5 adjacent the slot 6 are a series of numbers I0 running from l to 31 and indicating the days of the month.

The inner cylinder I I has a narrow end portion which extends beyond the adjacent end of the outer cylinder 5 and is enlarged and roughened or corrugated as at I2 to facilitate turning of the inner cylinder II with respect to the outer cylinder 5. At this end, the inner cylinder II is provided with peripherally or circumferentially arranged notations I3 of the months of the year, any single one or group of which may be exposed through the slot 9 of the outer cylinder 5 by relatively rotating said cylinders until the selected notation or group of notations I3 is registered with said slot S as shown in Figure l. The inner cylinder II is also provided upon its concealed major portion with a circumferential series of longitudinal rows of spaces I4, certain rows of spaces being aligned with a month notation or group of month notations I3 of said inner cylinder I I as shown clearly in Figure 3. These rows of spaces `I4 are adapted to receive, in predetermined relation, numerals indicating days of the month. As these members will vary according to the particular menstrual cycle for which the calculator is adapted, they are not shown, although they can be readily determined and supplied. Suitable means may be provided for restraining the cylinders 5 and II against relative rotation when the proper month notation or group of month notations I3 has been alined with and exposed through the slot 9, said means being illustrated as a spring-pin catch I5 carried by an end of the outer cylinder 5 and having its pin extending inwardly and adapted to enter any one oi a circumferential series of openings provided in the adjacent end of the inner cylinder II as indicated at it. As the specic structure or nature of this means is not a part of the present invention per se, illustration thereof more in detail is deemed unnecessary.

The sliding band or sleeve I'l its snugly over the outer cylinder 5 so as to be manually movable longitudinally of the latter, and this band or sleeve is provided With four circumferentially arranged openings I8, I9, 28 and 2l. The arrangement is such that when a month notation or group of month notations I3 is alined with the slot 9, the numerals in three alternate ones of the rows of spaces I4 are exposed through the slots 6, 'I and 8 of the outer cylinder 5. Also, when the sleeve Il is shifted longitudinally of the outer cylinder 5 so that one of the days of the month indicating numerals IQ is registered with the opening I3 of said band or sleeve Il, a numeral in one space of each of the rows I4 exposed through the slots 6, 'I and 8 will be respectively exposed through the openings E9, 2?) and 2| of said band or sleeve I'I. With the proper arrangement of numerals in the rows of spaces I4, the numeral exposed through the opening I 9 will indicate the day of the month when the next menstrual period will begin, the date of beginning of the previous menstrual period being indicated by the month notation exposed through the slot 9 and the day of the month numeral exposed through the slot I3. Atthe same time, the numeral exposed through the opening 20 will indicate the day when fertility will begin with respect to the menstrual period whose date of beginning is indicated by the numeral exposed through the opening I9, and the numeral exposed through the opening ZI will indicate the day when fertility will end with respect to the latter menstrual period. In other words, assuming that the day when the last menstrual period began was March 14 as indicated by the notations exposed through the slots 9 and I8 as shown in Figure l, the numerals exposed through the openings I9, 20 and 2| of the sleeve Il will respectively indicate the day when the next menstrual period will begin, the day when fertility will begin with respect to this next menstrual period, and the day when fertility will end with respect to such next menstrual period. With respect to any particular calculator, the dates will of course only apply to one given menstrual cycle, which cycle may vary from 26 to 3l days.

In order to releasably retain the sleeve or band l'I in any position of adjustment longitudinally of the cylinder 5 wherein a numeral ID Ais exposed through its opening I8, said band or sleeve I'I may be provided with a spring-pin catch 22 similar to that indicated at I5 and having its pin passing inwardly through the sleeve I'I and arranged to enter a desired one of the longitudilnal series of openings 23 provided in the outer cylinder 5, one beneath each of the numerals Ill. These spring catches are preferably employed so that the device need not be carefully handled in order to prevent accidental displacement of the cylinders when they are set relative to each other or accidental displacement of the sleeve il longitudinally of the outer cylinder 5 when it has been set in a predetermined position longitudinally of said cylinder 5.

In view of `the above, it will be seen that the present device provides for showing the date of beginning of the next menstrual period and the date of beginning and 'the date of ending of ferltility with respect to said period when the date of beginning of the previous menstrual period is known, the respective first-mentioned dates being shown through the openings I9, 20 and 2| of the sleeve II when said sleeve has been positioned so that the numeral i exposed -through Ithe opening Iii of sleeve Il indicates the day of the month vwhen the previous menstrual period began, and when the outer cylinder has been adjusted relative `to the inner cylinder I l so that the notation ES exposed through the slot 9 indicates the month in which said previous menstrual period began. It will be understood :that the device illustrated in the drawings 'and described herein is merely shown lby way of example of a form of my invention that I consider to be desirable. Therefore, I do not confine myself to the precise details shown and described. It is noted that the month notations i3 are scientifically arranged and grouped both as 4to the number of days contained in each month andthe number of Idays in the succeeding month. By rst providing January, then February, then grouping Marchf May, August and October, then grouping ApriL J une, September and November, and finally grouping July and December, only rows I4 need be provided with numerals.

What I claim as new is:

l. A menstrual and fertility calculator comprising an outer cylinder having three longitudinal slots therein extending the greater part of the length thereof, said outer cylinder also` having a short slot in one end of the same and provid-ed with a longitudinal series of numerals thereon opposite said slot indicating the days of a month, an inner cylinder having a circumferential series of notations on one end thereof indi- -cating the months of the year and adapted to be selectively exposed through said short slot of the outer cylinder upon relative rotation of the cylinders, said inner cylinder also having a circumferential series of longitudinal rows of spaces adapted to receive numerals indicating days of months, alternate rows being arranged for exposure through the longitudinal slots of the outer cylinder, `and a sleeve tted over and longitudinally slidable on the outer cylinder and provided with four circumfererrt-ally arranged openings adapted to be respectively registered with a numeral of said longitudinal series of numerals and a numeral of the respective rows of spaces exposed -through the three longitudinal slots of the outer cylinder, whereby, when said sleeve and outer cylinder `are positioned to respectively reveal through said short slot and an Iopening of the sleeve the month and day of said month indicating the beginning of a given menstrual period, the numerals exposed through the remaining openings of the sleeve and of the rows exposed `through said longitudinal slots of Vthe outer cylinder will indicate respectively the day of 4beginning of the next menstrual period, the day of beginning of fertility with respect to the latter period, and the day of ending of fertility with respect to the latter period.

2. A menstrual and fertility calculator cornprising an outer cylinder having three longitudina'l slots therein extending the greater part of the length thereof, said outer cylinder =also having a short slot in one end of the same and provided with a longitudinal series of numerals thereon opposite said slot indicating the days of a month, an inner cylinder having a circumferential series of notations on one end thereof indicating the months of the year and 'adapted to be selectively exposed through said short sloi'J of the outer cylinder upon relative rotation `of the cylinders, said inner cylinder also having a circumferential series of longitudinal rows of spaces adapted to receive numerals indicating days of months, alternate rows being arranged for exposure through the longitudinal slots of the outer cylinder, a sleeve fitted over and longitudinally slidable on the outer cylinder and provided with four circumferentially arranged openings adapted to =be respectively registered with a numeral of said longitudinal series of numerals and a numeral of the respective rows of spaces exposed through the three longitudinal slots of the outer cylinder, whereby, when said sleeve and outer cylinder are positioned to respectively reveal through said short slot and an opening of the sleeve the month and day of said month indicating the beginning of a given menstrual period, the numerals exposed through the remaining openings of the sleeve and of the rows exposed through said longitudinal slots of the outer cylinder will indicate respectively the day of -beginning of the next menstrual period, the day of beginning of fertility with respect to the latter period, and the day of ending of fertility with respect to the latter period, said inner cylinder having an end portion exposed beyond one end of the outer cylinder and enlarged and roughened t-o facilitate turning of said inner cylinder.

3. A menstrual and fertility calculator compris- `lng an outer cylinder having three longitudinal slots therein extending the greater part of the length thereof, said outer cylinder also having a short slot in one end of the same and provided with a longitudinal series of numerals thereon opposite said slot indicating the days of a month, an inner cylinder having a circumferential series of notations on one end thereof indicating the months of the year and adapted to be selectively exposed through said short slot of the outer cylinder upon relative rotation of the cylinders, said inner cylinder also having a circumferential series of longitudinal rows of spaces adapted to receive numerals indicating days of months, alternate rows being arranged for exposure through the longitudinal slots of the outer cylinder, a sleeve fitted over and longitudinally slidable on the outer cylinder and provided with four circumferentially arranged openings adapted to be respectively registered with a numeral of said 1ongitudinal series of numerals and a numeral of the respective rows of spaces exposed through the three longitudinal slots of the outer cylinder, whereby, when said sleeve and outer cylinder are positioned to respectively reveal through said short slot and opening of the sleeve the month and day of said month of a given menstrual period, the numerals exposed through the remaining openings of the sleeve and of the rows exposed through said longitudinal slots of the outer cylinder will indicate respectively the day of beginning of the next menstrual period, the day of beginning of fertility with respect to the latter period, and the day of ending of fertility with respect to the latter period, and means to releasably retain the sleeve in different positions of adjustment longitudinally of the outer cylinder.

4. A menstrual and fertility calculator comprising an outer cylinder having three longitudinal slots therein extending the greater part of the length thereof, said outer cylinder also having a short slot in one end of the same and provided Withua longitudinal series of numerals thereon opposite said slot indicating the days of a month, an inner cylinder having a circumferential series of notations on one end thereof indicating the months of the year and adapted to be selectively exposed through said short slot of the outer cylinder upon relative rotation of the cylinders, said inner cylinder also having a circumferential series of longitudinal rows of spaces adapted to receive numerals indicating days of months, alternate rows being arranged for exposure through the longitudinal slots of the outer cylinder, a sleeve fitted over and longitudinally slidable on the outer cylinder and provided with four circumferentially arranged openings adapted to be respectively registered with a numeral of said longitudinal series of numerals and a numeral of the respective rows of spaces exposed through the three longitudinal slots of the outer cylinder, whereby, when said sleeve and outer cylinder are positioned to respectively reveal through said short slot and an opening of the sleeve the month and day of said month of a given menstrual period, the numerals exposed through the remaining openings of the sleeve and of the rows exposed through said longitudinal slots of the outer cylinder will indicate respectively the day of beginning of the next menstrual period, the day of beginning of fertility with respect to the latter period, and the day of ending of fertility with respect to the latter period, and means to releasably retain the outer cylinder against rotation relative to the inner cylinder in different positions of relative rotary adjustment of said cylinders.

ROBERT L, SIFRIT.