World watch

Horology: time measuring systems or devices – Plural time zones

Patent

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Details

368 27, G04B 1922

Patent

active

043475949

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a world watch, that is to say a watch which is able to indicate to the wearer the time at any point in the world on the basis of the local time or which makes it possible to determine the local time at a given place which corresponds to a particularlocal time.
So-called world watches are already known, but their disadvantage is that they are of a relatively complicated construction so as to be able to give the desired information. Furthermore, this information can only be obtained by selecting from a large number of different parts of the watch the particular part necessary for carrying out the requisite setting, which gives rise to incorrect operations and/or interpretations.
One of these watches (Swiss Pat. No. 339,128) has a fixed case comprisng the watch mechanism with two normal hands and a normal face, the latter being surrounded by two rotary rings, whereof one which is called the time zone ring carries the inscriptions indicating the most important city for each time zone, whilst the other ring called the hour ring carries 24 circles corresponding to the 24 hours of the day. As stated hereinbefore, these two rings rotate and can be actuated independently of one another in order to determine the local time in a random place in the world or the local time for a particular time determined in a given place. These two rings necessitate a relatively complicated case construction due to the sealing problems which occur.
Another watch (Swiss Pat. No. 343,917) similar to that described hereinbefore has a rotary time zone ring which can be rotated by the ring flange and is located in an annular groove. It is therefore necessary to provide a special support in the case to receive this ring, as well as to provide a special axial position for the ring flange in order that it can not only drive the watch movement and the hands, but also said ring, without actuating the other parts of the watch during its rotation.
Another world watch (Swiss Pat. No. 451,827) is known which is equipped with four hands. A rotary lunette can be rotated to determine the local time at the given place. However, the presence of four hands not only gives rise to confusion with regard to the local time, but it also significantly complicates the problems of said hands in the centre of the face, together with the individual driving thereof.
Another watch (Swiss Pat. No. 504,033), whose construction is similar to the second of the prior art watches is equipped with a world time indicator in the form of a rotary transparent dome. In the same way there are problems in driving the dome and maintaining the necessary sealing in this construction.
The present invention relates to a world watch which has a much more simplified and robust construction, which can be manufactured at a lower cost and which gives a clear indication of the desired time without giving rise to errors, thus obviating all the disadvantages mentioned hereinbefore.
The world watch according to the invention is characterised by the characterising features of claim 1.
An exemplified embodiment is described in non-limitative manner hereinafter with reference to the drawings, wherein show:
FIG. 1 a front view of the watch.
FIG. 2 a partial section along the line II--II of FIG. 1.
FIG. 3 a side view similar to the cross-section of FIG. 2 of the external parts of the watch in an exploded position.
FIG. 4 a partial view of the locking ring.
FIG. 5 a partial view from below of the lunette.
The watch comprises a conventional watch mechanism housed in a case (for reasons of simplification the known mechanism and the case are illustrated in FIG. 2 as unit 1), a bezel 2 encircling the face 3 and the glass 4 of the watch above the face 3, a back 5 and a locking ring 6, the latter carrying two diametrically opposite attachments 7 for the strap 8.
The watch mechanism can be of any per se construction but only drives a single hand, i.e. that indicating the hours.
As can be gathered more particularly from FIG. 3 the back 5 and the bezel 2 are fixed by means of screws

REFERENCES:
patent: 3277646 (1966-10-01), Howard, Sr.
patent: 3382666 (1968-05-01), Gerry

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