CA1282808C

CA1282808C - World time device

Info

Publication number: CA1282808C
Application number: CA000613845A
Authority: CA
Inventors: Dwight Darling
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-09-28
Filing date: 1989-09-28
Publication date: 1991-04-09
Anticipated expiration: 2009-09-28
Also published as: CN1050621A; NL9002127A; IE903429A1; IT1242354B; CH681266GA3; GB9021151D0; SE9003034L; AU6437990A; CS471590A3; IT9048318A0; PT95465A; IL95779A0; DE4030744A1; GB2236413A; PL287076A1; ZA907681B; SE9003034D0; IT9048318A1; FR2652425A1; JPH04503860A

Abstract

ABSTRACT

A device for determining the time anywhere in the world, simultaneously, relative to any selected geographical location. A circular map is positioned over a frame and is rotatable in a clockwise direction relative to the frame, the map being a south pole projection of the world. The map rotates about the center point of the map corresponding to the south pole. Twenty-four evenly spaced first time zone positions are provided on the frame beyond the outer boundary of the map and together they define a circle which is outwardly concentric with the map. Twenty-four evenly spaced second time zone positions are provided on and around the perimeter of the map so as to define a second circle between and concentric with the circle defined by the first time zone positions and the map. Each first and second time zone position corresponds to a distinct hour of a twenty-four-hour time period. Land areas of the map and their associated second time zone positions are visually coded (for example, colour coded) to correspond to distinct time zones. To operate the device the map is rotated in a clockwise direction to align the second time zone position associated with a pre-selected land area with the corresponding first time zone position and, by associating first and second time zone positions and corresponding land areas by means of the visual coding, an identification is made of the distinct hour relative to the pre-selected land area which corresponds to a selected land area.

Description

~Z~28~8 WORLD TIME DEVICE

FIELD OF THE INV~NTION
A device for determining the time at any geographical location in the world rela-tive to a pre-selected location. The device may be combined with a twenty-four hour clock mechanism for automated operation.

BACKGROUND
Many devices and calcula-tion means for determining the time in different time zones of the world have been used in the past. However, all such prior means have required some form of calculation, or skilled operation, on the part of the user or a high degree of knowledge of, and familiari-ty with, the subject of world geography.
; United States Patent No. 594,410 to Margolis describes one such device comprising two overlapping maps which together rotate by means of the operation of a twenty-four-hour clock mechanism, one map being of the southern hemisphere and the other of the northern hemisphere. However, a high degree of visual confusion is caused by the use of such overlapping maps and it is difficult to identify the position of selected ci-ties, or even countries, on such a combination of maps.
Moreover, the Margolis paten-t does not provide a visual coding means whereby land areas falling within different time zones may be readily distinguished. The Margolis reference further .
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~28Z~308 does not readily lend itself to the marking of city and country names on the maps themselves because of the fact of there being two overlapping maps and, therefore, several areas having too many associated names to mark on the limited area provided.

SUMMARY OF THE INVENTION
_ The invention claimed herein provides a device for determining the time of day anywhere in the world, and the device does not have associated with it the above-identified disadvantages of the prior art. The device may be manually operable or may instead be automated in the form of a clock.
Essentially, the device comprises a frame, a rotatable map positioned thereover, twenty~four evenly spaced first time zone positions on the frame and together defining a first circle which is outwardly concentric with the map and twenty-four evenly spaced second time zone positions around the perimeter of the map and together defining a second circle between and concentric with the first circle and -the map. The map is a south pole projection of the world and rotates in a clockwise direction relative to the frame such that rotation occurs about the center point of the map corresponding -to the south pole.
Each of the first and second time zone positions on the frame corresponds to a distinct hour of a consecutive twenty-four-hour time period. Land areas of the map and their associated second time zone positions are visually coded so as to correspond to distinct time zones. The map may be rotated in a clockwise direction to align the second time zone position ' .

~IL2~Z~3~8 associated with a pre-selected land area with the corresponding first time zone position to identify from the device, by associating first and second time zone positions and corresponding land areas by means of the visual coding, the distinct hour of the twenty-four hours which corresponds to a selected land area.
In a preferred embodiment of the invention, the operation of the device is automated by means of a twenty-four-hour clock mechanism, the hour hand of the clock mechanism being fixed to the map so that -the map is caused to rotate by and with the hour hand. Preferably, the device, whether manually operable or in the form of a clock, includes additional visual coding means associated with land areas of the map which are in half-hour time zones.

BRIEF DESCRIPTION OF THE DRAWING
Figure 1 illustrates a world time clock device embodying the inven-tion.

DETAILED DESCRIPTION OF AN EMBODIMENT OF THE INVENTION
The invention is described in detail in -the following with reference to Figure 1. Reference numerals referred to hereinafter refer to the reference numerals appearing in Figure 1 to identify eleménts of the device illustrated thereby. The embodiment of the invention of Figure 1 is selected for purposes of illustration only; it is to be understood by the reader that other embodiments might instead - : .
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~2~280~3 be selec-ted if desired, for example, an embodiment whieh is manually operable.
Referring to Figure 1, a world time eloek device 10 is shown having a frame 15, a rotatable map 50 positioned thereover, twen-ty-four first time zone positions 20, 35 evenly spaced around said frame 15 and beyond the outer boundary of the map 50 so as to define a circle thereon, and twenty-four evenly spaced second time zone positions 30, 40, 45, 160 on and around the perimeter of the map 50 and together defining a second circle between and concentric with the circle defined by the first time zone positions and the map 50.
The map 50 is a south pole projection of -the world and rotates in a cloekwise direetion abou-t the center point 150 of the map whieh eorresponds to the south pole. A eonventional twenty-four-hour eloek meehanism (not shown) is installed below the map 50 and within the frame 15, the eloek meehanism comprising an hour hand 60, a minute hand 70 and a second hand 80. The hour hand 60 is fixed to the rotatable map 50 so that the automated rotation of the hour hand 60 (via the conventional battery-operated cloek mechanism) eauses the map 50 to rotate wi-th -the hour hand 60 as the hour hand 60 rotates.
A full eireular rotation of the hour hand 60, and therefore the map 50, oeeurs onee every twenty-four-hour period. (A north pole projeetion map is not suitable as the device eould not then use a eonventional clock meehanism which operates in a eloekwise direction; rather a eounter-clockwise rotation of the map would be r~quired. A further disadvantage assoeiated with .

~LZ~28~3 a north pole projection map would be a high concentration of land around the center of the map.) The twenty-four first time zone positions (e.g. 20) are marked to identify the hours of a single twenty-four-hour time period from 12 a.m. to 11 p.m. For clarity and improved readability, these hourly markings also include the marking "NOON" in association with the time zone position marked 12 p.m. and "MIDNIGHT" in association with the 12 a.m. time zone position. Each time zone position (20) corresponds to a distinct hour of a twenty-four-hour time period and, therefore, the hour hand 60 passes by a first time zone position (20) every hour. The minute hand 70 rota-tes once every hour (the same as for conventional twelve hour clocks) and, therefore, passes by a first time zone position (20) every two and a half minutes. Similar to -the operation of the minute hand 70, the second hand 80 passes by a first time zone position (20) every two and a half seconds. Accordingly, the time of the day indicated by the clock hands 60, 70, 80 shown in Figure 1 is 12:51:41 p.m. This is the time for all land areas corres-ponding to first time zone position 30.
Because the map 50 is a single south pole projection map of the world, portraying all land areas of the world in a single plane relative to the south pole, the longitudinal lines (e.g. 170, 175) do not identify or distinguish different time zones of the land areas shown on the map. Rather, the differen-t time zones corresponding to land areas of the map 50 are visually distinguished by means of colour coding. For ~ ~3280~

example, with reference to Figure 1, -the colour coding selected for -the land area comprising the Canadian province of Manitoba, the United States state of Minnesota downwards through to Louisiana, Mexico and Central America is red (shown in Figure 1 by dark shading) and, as can be seen from the map 50, this area crosses over the longi-tudinal lines 170, 175. The second time zone position 30 is also colour-coded with the colour red such that all land areas which are colour-coded with the colour red correspond to the red colour-coded second time zone position 30. In turn, the second time zone position 30 is aligned with, and corresponds to, the first time zone position 35 representing, in Figure 1, 12 p.m. In any given quadrant of the map 50, the colour selected for the visual coding of land areas within the same time zone is not duplicated, to avoid confusion in identifying land areas within distinct time zones, but may be duplicated in the opposite quadrant without risk of confusion. Thus, in the embodiment of Figure 1, it was elected to also use the colour red for the second time zone position 160 and its associated land areas 165 falling within the time zone 12 a.m.
To set the device 10 for use in the particular geographical area in which the user is located, the hour hand 60 is positioned so as to align with the first time zone position which corresponds to the closest hour of tha-t geographical area and the minu-te and second hands are aligned with the first time zone positions corresponding to the minute and second of tha-t area (bearing in mind that each first time :

~2~ 08 zone position corresponds only to two and a half minutes or seconds, respectively). Referring to Figure 1, the device 10 is set for use in the preselected geographical land area comprising Ottawa, Canada and the hour hand 60 is approaching the first time zone position marked "1 p.m.". The device identifies the time in Ottawa, Canada as being 12:51:41 p.m.
(approaching 1 p.m.). The same time applies to all other land areas having -the same colour coding as the second time zone position 45 (which is aligned with the 1 p.m. first time zone marking) for example, New York City 130.
To determine the time in any other selected geographical land area, outside of the time zone comprising the land areas which are colour-coded to correspond -to the 1 p.m.
first time zone position marking shown in Figure 1, one identifies the colour associated with that land area, the second time zone position nearest that area which corresponds to that colour and the corresponding first time zone position located above that second time zone position. For example, with reference to Figure 1, it may be seen that when the time in Ottawa, Canada is 12:51:41 p.m., the time in Mexico is one hour earlier, that is, 11:51:41 a.m. Simultaneously, the time in all other land areas of the map, relative to -the pre-selected land area (being Ottawa in the foregoing example) may be determined according to the foregoing procedure.
To account for land areas which are situated in half hour time zones, a different vlsual coding means is used to identify such areas. In the embodiment of Figure 1, vertical ' ' : :

,, ~ . . -: . . I . -~LZ~2~3~8 lines are used to indicate an area for which the time is one-half hour prior to the neighbouring land areas having the same colour code. In Figure 1, therefore, Newfoundland, Canada is colour-coded to be the same colour as Greenland and is also coded by vertical lines 100 to identify that the time in Newfoundland is one-half hour prior to that in Greenland.
The International Date Line 90 marks the date applicable to the geographical areas of the map 50. To illustrate this with reference to Figure 1, it is shown -that Alaska corresponds to the 8 a.m. first time zone position marking and that New Zealand corresponds to the 6 a.m. first time zone position marking. If the date is 1 January in Ottawa, Canada, -the date in Alaska is also 1 January but 2 January in New Zealand. Since the a.m. hour applicable to New Zealand falls on the opposite side of the International Date Line relative to Alaska, as well as the first time zone position markings 1 a.m. to 6 a.m., all of these positions pertain -to the day following that of Ottawa, Canada.
While the foregoing specific description is directed to the embodiment shown in Figure 1, the invention is not limited to the described embodiment. Many variations of the specific features described above might be made while still falling within the scope of the invention. For example, as .
s-tated previously, the clock mechanism need not be included if, say, a manually operable pocket device, according to the nventlon, were to be instead desired. In the case of a hand-operated device, the user may prefer to rotate the frame ::
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in counter-clockwise direction relative to the map to set the time zone positions for a pre-selected land area, rather than to rotate the map, the two manners of operation being equivalent.

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Claims

1. A device for determining the time anywhere in the world relative to a selected geographical land area, said device comprising:
(i) a frame;

(ii) a circular map positioned over said frame and rotatable in a clockwise direction relative to said frame, said map being a south pole projection of the world whereby said map rotates about the center point of said map corresponding to the south pole;

(iii) twenty-four first time zone positions evenly spaced on said frame and together defining a first circle which is outwardly concentric with said map whereby each said first time zone position corresponds to a distinct hour of a twenty-four-hour time period; and, (iv) twenty-four second time zone positions evenly spaced on and around the perimeter of said map and together defining a second circle between and concentric with said first circle and said map whereby each said second time zone position corresponds to a distinct hour of said twenty-four-hour time period and said second time zone positions are colour-coded, - Page 1 of Claims -wherein land areas of said map are colour-coded to correspond to the individual second time zone positions representing the distinct hour of said twenty-four hours corresponding to those areas, whereby said map may be rotated in a clockwise direction relative to said frame to align a pre-selected second time zone position with its corresponding first time zone position to identify from said device, by associating first and second time zone positions and corresponding land areas, the distinct hour of said twenty-four hours which corresponds to any other selected land area.

2. A device according to claim 1 comprising a twenty-four-hour clock mechanism, including hour and minute hands, whereby said hour hand is fixed to said map such that said map is caused to rotate by and with said hour hand.

3. A device according to claims 1 or 2 whereby said map includes additional coding means associated with land areas in half-hour time zones.

- Page 2 of Claims -