Abstract: A device for determining the time anywhere in the world, simultaneously, relative to any selected geographical location. A circuit 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 distint hour of a twenty-four-hour time period.

Abstract: A timepiece having a pivot supporting an hour hand, a coaxial shaft supporting a minute hand and a dial, having hour and minute indicia and openings corresponding to time zones. A gearwheel having a number of teeth corresponding to the number of time zones, is supported on the pivot and bears a disk having time-zone indicia. A first elastic element biases a radially movable body towards the gearwheel. A cam acts on the body every hour to move it against the biasing action of the first elastic element to a disengagement position, whereat the first elastic element causes a snap-action movement of the body towards the gearwheel. A pawl pivoted to the body is radially aligned with a tooth space of the gearwheel by a second elastic element. The resultant rotational traction of the gearwheel corresponds to a one-hour movement of the disk and the time zone indicia.

Abstract: A time conversion universal clock includes a time conversion transmission mechanism having one output connected with a time recording element, and another output coupled with a universal time zone map, so that the time recording element drives the universal time zone map in a counter-clockwise direction of rotation. The universal time zone map displays at least some of the world's geographical regions in a polar projection in terms of time zones corresponding thereto. A time conversion transmission mechanism of the time conversion universal clock has a rotary input at a first rotation rate, and provides a rotary output at a second rotation rate; the ratio of the first to the second rotation rates is defined as a transmission ratio, which is made equal to 0.5 by two pulleys, or, alternately gearwheels, of a coupling device of the time conversion mechanism, which engage one another, and have a diameter ratio of two.

Abstract: A watch has an hour wheel (17) which can be driven in rotation around an axis of rotation (10) by a drive, and has a rotatable universal-time hour wheel (13) arranged coaxially thereto. These two hour wheels are connected to each other by a spring-loaded detent connection. The universal-time hour wheel (13) is rotatably settable stepwise relative to the hour wheel (17) by a setting element. It overcomes the spring force of the detent connection, in which connection the setting element can be coupled to the universal-time hour wheel (13) for setting the latter and can be decoupled again after the setting. The hour wheel (17) is connected to an hour hand (2), and a universal-time hour hand (3) is connected to a universal-time hour wheel (13), by which means the times of two different time zones can be indicated on a stationary dial face.

Abstract: A clock or watch can display 24 local times of 24 selected cities or places around the world which represent the 24 time zones around the globe respectively, including the local time of the place where the user lives no matter where the user or the watch is in the world. In addition, an alarm time can be set for the local zonal time as well as for any other 23 zonal times in the world.

Abstract: This international world clock is design to readout a display of time in major cities of the world. Primarily, it consists of a world map panel secured to a pane mounted in an opening of a housing, and a motor is provided in the housing and is provided with an attached disk that is coupled to a time disk rotated by the motor.

Abstract: The timepiece of this invention comprises at least one hand making a revolution in twelve hours and a disc making a revolution in twenty-four hours. A crown enables simultaneous setting of the hand and disc display when pulled out to the second position. When rotated in one sense while in the first pulled-out position the crown sets the disc only. Between the disc and the hand there is interposed a speed reducer provided with a hollowed-out gear containing a jumper spring. The jumper engages a star wheel, itself fixed to a pinion which meshes with teeth borne by the disc. In operating the disc through this mechanism it is displaced through one hour intervals by the action of the end of the jumper on the teeth of the star wheel.

Abstract: A synchronous world clock which allows a user to determine the exact time at any location on earth is disclosed. The clock is comprised of a planisphere of the earth, a time scale surrounding the planisphere and a drive for rotating the planisphere counterclockwise relative to the time scale once every twenty-four hours in synchrony with the rotation of the earth with respect to the sun. The planisphere is a two-dimensional map of the earth which includes an accurate north polar projection of all the earth's inhabited continents. It is divided into a plurality of time zones corresponding to the earth's twenty-four standard time zones. The time zones are marked by a plurality of corresponding time zone indicators equally spaced along the circumference of the planisphere and numbered counterclockwise from 1 to 24.

Abstract: A clock for indicating time for effectively all the countries and time zones of the world, the hour hand of the clock being in the form of a disc that rotates once every twenty-four hours against a twenty-four hour scale. The disc having projected thereon a map of the world centered on the South Pole with the majority of the time zones positioned in accurate longitude around the periphery of the disc. The clock also included indicators for each time zone to provide simple visual indication of the time in any zone or country of the world.

Abstract: World watch with a single hand (9) comprising a watch mechanism in a case, a bezel (2) above the case, a face (3) and a hand (9), together with a back, said assembly forming an internal body which is mounted in a relatively easy manner within an external locking ring (6). The said ring is located in a peripheral groove (12) formed by the bezel (2) and the back. The body can be rotated in a stepwise manner, as it is locked in each position by means of a locking device comprising two bosses (13) on the locking ring (6) and slots (14) on the bezel (2). One of the attachments (7) carries a numeral (16) and the bezel (2) is provided with a mark (17). By rotating the body, the mark moves away from the stationary numeral. The difference, determined in hours on face (3) which carries no numbers, gives the time variation between different time zones throughout the world.

Abstract: An attachment for a watch that locates the time figures of a very simple disc in position to adapt the watch to a different time zone without setting the hands. In one embodiment, the disc is flexible and transparent, except for printed indicia, and is adapted for self-sticking application to the watch crystal. In another embodiment, disc is adjustable for any selected time zone.

Abstract: A supplemental clock dial for a clock comprising an annular transparent disc mounted centrally on a bushing driven to turn the hour hand, an hour hand on the annular disc, said disc rotating once in twelve hours and including the names of countries or cities around the world and showing the time in those places, the names of said countries and cities being mounted on balanced swinging members so that they are always upright; and including separate members showing the AM and PM indications for each of said countries or cities these members being swingingly mounted on the first named members and including means to turn them 180.degree. each twelve hours, and having weights for keeping the same in upright position for a period of twelve hours, whether AM or PM.