Global timepiece
FIELD OF THE INVENTION 
     The present invention particularly indicates a structural improvement for the global timepiece which can provide an easy way to read, from the same face, the time and date everywhere all over the world and can conveniently adjust the time needed to indicate. 
     BACKGROUND OF THE INVENTION 
     Owning to the greatly elevated living standard of our country people, the chances of touring and business negotiating abroad are getting more frequent and fervnet. To understand and master the local time becomes more and more important for those people traveling around the world. Under this kind of demand, the common timepiece will not be able to provide this kind of information. As far as the function as concern, the people who are frequently traveling abroad need to have a timepiece which can provide, at any moment, the local time all over the world so that they can control the time effect and strive for the business opportunities. The traditional way of telling time in the world&#39;s major cities is just like the common travel agencies or hotels where several clocks are hung on the wall behind the reception counter, and each clock indicates the local time of a certain major city. As the whole world is divided into twenty four time zones, one can hang only several clocks to indicate several major cities&#39;s time since the space is limited. This certainly can not satisfy people from all over the world. Gradually, various kinds of global timepiece have been developed to improve this inconvenient situation which can show the local time all over the world through the reading of a single timepiece to substitute the traditional way of telling time by several wall-clock, thereby, greatly elevate the funtion of the timepieces. Observing the current global timepieces, although they have possessed the function of providing the global time, there are still shortcomings in many respects and far from the ideal. Followings are explanations with respect to their types and functions: 
     1. Please refer to FIG. 1, the case of this type of global timepiece has a fixed scale, the center ring is a rotatable city dial, the inner ring is a general time indication. The way of showing time is to rotate the city dial untill the city position inquired match the scale on the case. At this moment, the hour hand in the inner ring follows the rotation of the city dial to show the city time inquired. There is a big shortcoming of this type of showing time, that is, it can show, on the face, only the time of a single time zone and is unable to show different time in different time zones simultaneously which is not appropriate to be used in public places. Also, it shows insufficient in function when it comes to comparing local time for different time zones. 
     2. Please refer to FIG. 2, the face of this type of timepiece is a kind of mother-and-son face, wherein the large time dial is for local time, and the small time scale and hands are for indicating the city time inquired which can be rotated in accordance with the city dial. The shortcoming of this way of showing time is the same as the aforesaid in explanation 1., what is more, this type needs more material for parts is manufacturing which not only can not upgrade the original function but also increases the manufacturing cost. In the practical point of view, it shows rather inadequate. 
     3. Please refer to FIG. 3, in this type of timepiece&#39;s face, the outer ring is a fixed city dial, the center ring is a rotatable time zone ring, and the inner ring, however, is a fixed local time dial. The way of showing time is that after searching for the inquired city zone directly, match the time zone scale required, then this is the time for that city. Although this type of showing time can show the time in different time zones on the same timepiece&#39;s face simultaneously, which modifies the aforesaid shortcomings in explanation 1. and 2., it needs to accompany the clockwise rotation of the inner ring&#39;s hour hand, insomuch, the scale of the time zone must be arranged in counter-clockwise order, thereby, it is very uneasy to read time according to the customary direction of reading timepiece, especially it is much more tedious on the date reading since one needs to deduce in a reverse way. As far as the customary way of reading time as concern, it appears complicated and not easy to read and thereby, not practical. 
     Inasmuch, the inventor then, with his years of research experience, constantly modifies the design, at long last, creates a kind of global timepiece, which can be read quickly and also easy to be adjusted, to improve the aforesaid shortcomings. It can make the global timepiece even more practical and ideal and proceed to upgrade the benefit of utilization which is the aim of the design of the present invention. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a structural improvement for the global timepiece. On the face design, the outer ring is a stationary time zone ring, with twenty four time zones, which is arranged in clockwise order; the center ring is a city dial which can accompany the hour hand to rotate; and the way of transmission of the second hand, minute hand, hour hand and alarm bell is the same as the gear trains rotation which is driven by the change of magnetic field of the motor&#39;s , induction coil. The present invention principally makes use of the hour wheel to engage and drive the post hour wheel to rotate and then to engage and drive the city wheel to rotate, through a post hour pinion which is on the same shaft as the post hour wheel. There is no limitation or rule for the gear ratio so long as the gear ratio for hour wheel and city wheel is 2:1, since the design principle is that the hour hand rotates a cycle being twelve hours and as the globe is divided into twenty four time zones, thereby, the hour hand rotates two cycles being a day while the globe spins a cycle to pass through twenty four time zones, hence the revolution ratio of the time wheel and city wheel being 2:1. Also a lock jumper is provided to lock-to-fit the city wheel and while the city wheel rotates, through the lock jumper, the city wheel drives the city dial to rotate. Besides, the city dial alone is sometimes provided also with a wind knob which enables it to rotate independently. What is more, the outer ring is provided also with a lock pin on the case surface to match with the city dial, to control the city dial&#39;s rotation. Thereby, one can adjust the hour wheel or city dial or both to get the appropriate local time, and when it comes to judge reading the time and date inquired, he can quickly read to obtain the time information in each time zone all over the world by the customary correct direction and looking up the time zone scale on the city dial. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     To facilitate your honor examiners to fully understand the present invention, a practical embodiment with accompanied drawings in conjunction with detailed explanation is as follows: 
     FIG. 1 is the schematic diagram of the prior art&#39;s global timepiece(I) 
     FIG. 2 is the schematic diagram of the prior art&#39;s global timepiece( ) 
     FIG. 3 is the schematic diagram of the prior art&#39;s global timepiece( ) 
     FIG. 4 is the plan view of the present invention. 
     FIG. 5 is the schematic transmission diagram of the present invention. 
     FIG. 6 is the schematic driving diagram of the city wheel and city dial of the present invention. 
    
    
     DESCRIPTION OF THE COMPONENT NUMBER 
     
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10     Time zone ring   11    City dial                                   
12     Dial             13    Hour wheel                                  
14     Post hour wheel  15    Wheel shaft                                 
16     Post hour pinion 17    City wheel                                  
18     Lock jumper      19    Wind knob                                   
20     Lock pin                                                           
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     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to FIG. 4, on the timepiece&#39;s face, the outer ring is a stationary time zone ring 10 with twenty four time zone divisions, the center ring is the city dial 11 which can rotate together with the city wheel and is annotated on, with names of the major cities in each time zone, and the inner ring is a fixed dial 12 indicating local time. 
     Referring to FIG. 5 the way of present invention&#39;s transmission on hour hand, minute hand and second hand is the same as that of the common timepiece, i.e. to make use of the alternating changes of the magnetic field of the motor&#39;s coil to drive the gear train, which will not be reiterated here. As far as the main parts of the hour wheel and city wheel is concerned, the present invention makes use of the hour wheel 13 to engage and drive to rotate the post hour wheel 14 on which the shaft 15 having its other end keyed in a post hour pinion 16, which in sequence, engages and drives the city wheel 17. The gear ratio of the gear train has no compulsory rule of limitation except that the one between hour wheel and city wheel be 2:1,i.e. as hour wheel 13 rotates two revolutions,the city wheel 17 rotates one revolution. This is to make use of the fact that the globe is divided into twenty four time zones and while the earth spins a revolution, which passes through twenty four time zones, it takes twenty four hours exactly. 
     Referring to FIG. 6, the city dial 11 makes use of the lock jumper 18 to lock-to-fit the inner teeth of the city wheel&#39;s gear. The inner gear has twenty four teeth, therefore as the city wheel 17 turns a revolution its inner wheel also turns a revolution of twenty four teeth and, in sequence, the city dial 11 turns also a revolution of twenty four time zones. Besides, the city dial 11 provides with an independent wind knob which can turn the city dial to rotate. Also, the case provides with a lock pin 20 which can lock-to-fix the city dial 11 and time zone ring 10 so that both of them can not rotate. By means of design as above, the present invention can quickly adjust to find out the user&#39;s inquired time. 
     Referring again to FIG. 4, if the local time in Hong Kong for the time being is three o&#39;clock A.M., one can read exactly from the time zone ring 10 to see Hong Kong locate in three o&#39;clock time zone, if the local time one inquires is Tokyo, he can read it on the city dial 11 to locate the Tokyo position and find out the corresponding time zone is four o&#39;clock on the time zone ring, hence the Tokyo time is four o&#39;clock A.M. 
     What is more, Wellington is the internatoinal dateline, its location is in the seven o&#39;clock time zone. This makes the time zone from 0 through 7 o&#39;clock belong to the same day and the rest being a day before, thereby, the present invention is very ease to judge reading the date of each city. Take the city of London as another example. From the same FIG. 4 one can judge reading that the time is 19 o&#39;clock a day before. In order to accompany the time adjustment, the present invention can use the ways as follows: 
     1. To adjust by the hour wheel: 
     As the city dial is locked by the lock pin, it makes the lock jumper, which is in between the city dial and city wheel, come off and leaves only the hour wheel rotating. This way is applicable, after one arrives in a foreign land, to have the local time dial directly adjusted to the time where one currently stays. This can provide one the local time for later information. 
     2. To adjust by the city dial: 
     After making the lock pin separate from the city dial, one can turn the wind knob which will make the lock jumper to loose the city wheel as well as the transmission train, which, in sequence, makes the rotation of city dial only but not the hour wheel since it is in the reverse direction of the power source. This is applicable to adjust when the time zone is incorrect. 
     3. To adjust both the city dial and the hour wheel: 
     After making the lock pin separate from the city dial, use the hour wheel to drive the transmission train which makes the city dial to rotate at the same time. This is applicable to the overall adjustment when the power soure is insufficient in power and needed to replace new batteries. 
     To summarize the foregoing statements, the present invention can quickly interpret reading the time and date of each of the major cities around the world. It is easy to make all kinds of adjustment and coordination. It profoundly possesses the practicality and progressiveness to provide the industry with the value of utilization and it is not found in any similar products, nor in any public publications, thereby is in accordane with the patentability which makes the inventor files this application.