EP0938056A1 - Analog currency converter suitable for watches - Google Patents

Abstract

The currency conversion system has two parts, a fixed ring (1) and a movable ring (2), one of rings is graduated in a logarithmic scale from 1 to 100 and the other has three currency reference marks on it EU for euro, DM for deutsche marks and FF for French franks. Manipulation of the movable ring around the fixed ring enables the direct reading of the three monetary equivalents.

Description

Purpose of the Patent

This patent relates to an analog system allowing, on watches, simple conversion of fixed rate currencies (such as EURO and various European currencies).

Analysis of the existing

To date, a number of systems have already been designed and produced for the currency conversion, using, among other things, circular logarithmic dials. Likewise, we thought of using watches to add additional dials to to have information (diving watch for example).

The originality of the patent consists in associating in a very simple way a graduated dial allowing an easy conversion of currencies on an object of everyday use easily accessible.

Principle of the Patent

On a circular watch, we add a first dial (Ring 1, see figure) fixed graduated in logarithmic scale from 1 to 100 and a second dial (Ring 2, see figure) mobile revolving around the previous one, on which the marks of the coins appear convert, the angular distance between the marks being on the logarithmic scale the exchange rate between the different currencies.

By moving the movable dial (Ring 2) and positioning the mark on the currency to be converted on the corresponding value (Ring 1), we then read at the level of the others markers (Ring 2) the corresponding value (Ring 1) in the currency associated with the mark.

It will be noted that a single manipulation makes it possible to have the equivalent of a coins in the various other coins identified on the mobile dial. Moreover, the scale 1 to 100 allows you to read hundredths (cents, cents ...) when the number obtained is less than 1.

Finally in the case of a variation of the parities, it will be noted that it suffices to change the mobile dial and replace it with a new one with the new parity marks between currencies

Extensions of the Principle

• à des systèmes à graduation logarithmique autre que de 1 à 100 (par exemple 1 à 10, 1 à 1000, 0.1 à 10....)
• à des systèmes équivalents obtenus par permutation des cadrans par exemple
• cadran mobile pour l'échelle, cadran fixe pour les repère,
• cadran échelle et cadran repères mobiles
• cadrans superposés
• cadran avec loupe pour améliorer la précision de lecture
• à des systèmes identiques à celui décrit ci-dessus et s'adaptant à d'autres objets circulaires communs (boussole par exemple)

This principle can be extended analogously

• to systems with logarithmic graduation other than from 1 to 100 (for example 1 to 10, 1 to 1000, 0.1 to 10 ....)
• to equivalent systems obtained by permutation of the dials for example
• movable dial for scale, fixed dial for markers,
• scale dial and moving markers dial
• overlapping dials
• dial with magnifying glass to improve reading accuracy
• to systems identical to that described above and adapting to other common circular objects (compass for example)

Technical explanations

Soit m1 la plus petite valeur graduée

Soit m2 la plus grande valeur graduée

Soit ta l'angle en degré entre m1 et m2

Circular Logarithmic Scale:

Let m1 be the smallest graduated value

Let m2 be the largest graduated value

Let ta be the angle in degrees between m1 and m2

If we want to scale the value x, the angle A in degrees between the scale and the scale of x is given by A = log (x / m1) * ta / log (m2 / m1)

Where log (u) denotes the natural logarithm of the number u

Generic model

• défini un premier cadran (Anneau 1) avec une échelle log de 1 à 100
• repéré sur un deuxième cadran (Anneau 2) 3 monnaies:
• L'Euro (symbole EU)
• Le Deutsche Mark (symbole DM)
• Le Franc Français (symbole FF)

   (les valeurs de conversion retenues sont dans le cas de cet exemple 1 EU=6.5 FF et 1 DM=3.35 FF)On the attached example, we have

• defined a first sundial (Ring 1) with a log scale from 1 to 100
• spotted on a second dial (Ring 2) 3 coins:
• The Euro (EU symbol)
• The Deutsche Mark (symbol DM)
• French Franc (symbol FF)

(the conversion values used are in the case of this example 1 EU = 6.5 FF and 1 DM = 3.35 FF)

The second dial being movable around the first, we positioned the EU symbol in front of the value 2.5, in order to know the values in FF and DM of 2.5 Euro

We read at the level of the FF mark a value slightly greater than 16 and at the level of the mark DM a value between 4.8 and 4.9.

This means that by this system, we can say that 2.5 Euro is worth a little more 16 Francs (exact value 16.25) or around 4.85 Deutsche Mark (exact value 4.84)

Claims (3)

Analog currency conversion device, designed to adapt to a watch characterized in that it comprises only two parts, namely a fixed ring (Ring 1 see figure) and a movable ring (Anncau 2), one of the rings being graduated with a logarithmic scale, the other ring carrying the marks of the currencies to be converted. Device according to claim 1, characterized in that it allows only one manipulation (rotation of the movable ring around the fixed ring) to have directly several monetary equivalents. Device according to claim 1, characterized in that it can be adapted to other portable circular objects in common use, such as a compass for example.

Images