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Publication numberUS3918251 A
Publication typeGrant
Publication dateNov 11, 1975
Filing dateApr 5, 1974
Priority dateApr 12, 1973
Publication numberUS 3918251 A, US 3918251A, US-A-3918251, US3918251 A, US3918251A
InventorsWakabayashi Yasuo
Original AssigneeWakabayashi Yasuo
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Digital world clock
US 3918251 A
Abstract
A digital world clock for indicating the world standard times at different places in the world and permitting a user to read the time at a desired place without resorting to complicated procedures. The world clock comprises: a table indicating world standard time zones consisting of 24 divisions, an endless film band trained around two pulleys and positioned in side-by-side relation to said table for reference purpose, said film band having thereon two zones extending lengthwise of said band in side-by-side relation to each other, one of said zones being divided into four parts representing night and day, whereby the run of said band on one side is visible to the user and indicates a series of 24 divisions representing 24 hours as well as the parts representing night and day; a digital minute-indicating portion having two openings, through which digits representing 00 to 59 minutes appear, said digits being marked on the outer circumferential surfaces of two drums, one of said drum attending to digits of the first order ranging from 0 to 9 and the other of said drum attending to digits of the second order ranging from 0 to 5. The aforesaid film band is connected mechanically to one of said drums which in turn is connected to a known clock mechanism.
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Description  (OCR text may contain errors)

United States Patent [1 1 Wakabayashi [451 Nov. 11, 1975 DIGITAL WORLD CLOCK [76] Inventor: Yasuo Wakabayashi, F -l91 Kamakurazushi I-lai-land 1362-293, Hisaki, Zushi. Kanagawa, Japan [22] Filed: Apr. 5, 1974 [21] Appl. No.: 458,214

[30] Foreign Application Priority Data Apr. 12, 1973 Japan 48-43181[U] [52] US. Cl. 58/425; 58/125 C [51] Int. Cl G04b 19/22; GO4b 19/02 [58] Field of Search 58/425, 125 C, 126 E [56] References Cited UNITED STATES PATENTS 2.001.633 5/1935 Segovia 58/42.5

2,417,695 3/1947 Lewis 58/425 Plillltll') E.\'aminerEdith Simmons Jackmon Attorney, Agent, or FirmBruce K. Thomas [57] ABSTRACT A digital world clock for indicating the world standard times at different places in the world and permitting a user to read the time at a desired place without resorting to complicated procedures. The world clock comprises: a table indicating world standard time zones consisting of 24 divisions, an endless film band trained around two pulleys and positioned in side-by-side relation to said table for reference purpose, said film band having thereon two zones extending lengthwise of said band in side-by-side relation to each other, one of said zones being divided into four parts representing night and day, whereby the run of said band on one side is visible to the user and indicates a series of 24 divisions representing 24 hours as well as the parts representing night and day; a digital minute-indicating portion having two openings, through which digits representing 00 to 59 minutes appear, said digits being marked on the outer circumferential surfaces of two drums, one of said drum attending to digits of the first order ranging from 0 to 9 and the other of said drum attending to digits of the second order ranging from 0 to 5. The aforesaid film band is connected mechanically to one of said drums which in turn is connected to a known clock mechanism.

11 Claims, 3 Drawing Figures US. Patent Nov. 11, 1975 BACKGROUND OF THE INVENTION carrying arabian figures representing hours and parts representing night and day, while the minutes are indicated by using minute-indicating openings, through which digits of two figures are visible.

2. Description of the Prior Art Hitherto, many attempts have been proposed as world clocks utilizing an ordinary clock construction such as having hour and minute hands. However, those suffer from disadvantages which dictate complicated procedures for reading the world standard times at different places in the world, thus failing to provide means whereby to read the world standard time at a desired city in the world, merely by watching an indicator. On the other hand, another approach such as using a digital, photoelectric indicator and an electronic type world clock is known, but this approach suffers from complicated constructions and is extremely costly. A

drum type digital world clock may be a right solution to this problem, butsuch has not been disclosed so far.

SUMMARY OF THE =INVENTION It is a principal object of the present invention to provide a drum-type digital world clock which is simple in construction and positive in operation, permitting reading of the world standard times at various places in the world at a glance. I

The present invention is directed to avoiding the aforesaid shortcomings experienced with the prior art world clocks, and the aforesaid object and other features of the present invention are readily attained in a 24 hours digital worldclock, which comprises: a table indicating a world standard time zones consisting of 24 divisions and attachable to a casing of a clock; an endless film band trained around two pulleys and positioned below said table for ready reference, said film band having thereon two zones extendinglengthwise of said band in side-by-side relation to each other, one of said zones being divided into 48 divisions representing night and day, whereby the run of said band on one side is visible to a user and indicates thereon a length of 24 divisions representing 24 hours as well as the parts representing night and day; a digital minute-indicating portion having two openings, through which digits representing 00. to 59 minutes appear, said digits being marked on the outer circumferential surfaces of two drums, one of said drums attending to digits of the first order ranging from to 9 and the other of said drums attending to digits of the second .order ranging from 0 to one of said pulleys andsaid drums being in engagement with each other by means of a gear mechanism, whereby the instant saidtwo drums come to positions indicating '00 minute in combination, said one of pulleys will rotate to advance said band intermittently a distance corresponding to one division of said band. The above mentioned and other objects and features will become apparent from the following detailed discription taken in conjunction with the drawings which indicate one embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a table indicating world standard time zones and a minute-indicating portion provided in a casing of a clock;

FIG. 2 is perspective view showing an endless film band having thereon 48 divisions representing hours on one side thereof and four parts representing day and night on the other side, lengthwise thereof, and two drums carrying digits representing minutes and in mechanical engagement with the aforesaid film band; and

FIG. 3 is a detailed perspective view of one of the pulleys for use with an endless film band, showing mechanical engagement of the pulley with the aforesaid two drums.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1, there is shown at 14 a table indicating world standard time zones, which table is attached to the casing of a clock by means of attaching portions 15, 15, as shown, and the table 14 carries a world map or the names of cities of concern and is divided into 24 divisions or time zones defined by vertical lines. These vertical lines are parallel and equally spaced across the face of the map, as illustrated. The table 14 further carries a mark A at 16 which represents the location of the user. Shown at 9 is a film sleeve or an endless film band which is trained around two pulleys which will be described in detail hereinafter and positioned below the table 14 for ready reference. The film band 9 has two zones extending lengthwise thereof in side-by-side relation horizontally, one of the aforesaid zones being divided into 48 divisions, in which there are shown in sequence figures 10 ranging from 0 hour to 23 hours and the other of the aforesaid zones being divided into four parts representing day 11 and night 12, respectively. Those parts 11, 12 are colored to distinguish night from day. Shown at 13 is a mark representing the sun and placed right below the division showing 12 oclock. Two openings are provided in the front face of the casing of a clock, indicating two digits therethrough, which digits are carried on the outer circumferential surfaces of drums l and 2. The aforesaid two digits represent 00 to 59 minutes of l the world standard times at a place of a user as well as at any desired places of the world, in common across the face of the map as indicated by the spaces between the aforesaid time zones.

Referring to FIG. 2, the film band 9 is trained around 7 two pulleys, one of which is shownat 8 and serves as a notch shown at 17 in its circumferential edge. The

drum gear 2 is coaxially journaled on a shaft, together with the drum gear 1, and also has a notch shown at 5 in its circumferential edge. Provided in parallel with the shaft of the drum gears l and 2 is another shaft which I mounts the three gears 3, 4 and 6 thereon. The gear 3 is a pinion gear which is loosely mounted (free to rotate) on the aforesaid shaft and has teeth which are adapted to engage the aforesaid notch 17 of the drum gear 1 on one side as well as to engage projections 18 I on the drum gear 2 on the other. The gear 4 is also a pinion gear which is loosely fitted (free to rotate) on the aforesaid shaft coaxially with the pinion gear 3.but integral with the gear 6 which is also fitted coaitially and free to rotate on the aforesaid shaft. The pinion gear 4 is adapted to engage a notch 5 provided in the circumferential edge of the drum gear 2 for rotation, and thereby the rotation of the pinion gear 4 is directly transmitted to the gear 6, because of their integral constructions. The drum gear 1 carries a series of digits ranging from to meshes 9, thus representing the minute of the first order. The drum gear 1 makes one cornpleterotation per l0 minutes, while the drum gear 2 makes one complete rotation per one hour and carries a series of digits ranging from 0 to 5, on its outer circumferential surface arranged in equal divisions, as in the case of the drum gear 1. The mechanism of operations of drum gears l and 2 follow a known principle, and thusdetailed description is omitted. The pinion gears 3 and 4 are so designed, in accordance with one aspectof. this invention as to be rotated through an angle of l2 0 when rotated. When the indication of the drum gears 1 and 2 are changed to 00 minute, the pinion gear 4 will mesh with the notch 5 in the drum gear 2, whereby the face gear 6'will be rotated through an angle of 120,The face gear 6 kmeshes with a face gear 7 which isrigidly mounted on the shaft of the pulley 8 at its lower end. The shaft of the pulley 8 extends perpendicularly to the coaxial shaft of gears 3, 4, and 6. The pulley 8 is of a sprocket type which engages the perforations provided along and in the side edge of the film band 9. Thus, the aforesaid rotation of the face gear 7 is sodesigned as to 'cause the film band to advance a distance corresponding to 1/48 of the circum- 4? place in the world, withotit resorting to any compli-' cated procedures.

It will be understood that the above description is merely illustrative of preferred embodiments of the in- 5 vention. Additional modifications and improvements ferential lengthofjthe filmband in one direction. In this respect, the lines dividing the hour indicating zone on the film band are designed as to align with the lines dividing the table 14 into 24 divisions at all. times.

Meanwhile, theaforesaid table may carry names of citiesof concern, while is recommendable that the midpoint of the Mediterranean Sea be positioned at the opposite ends of awprld map, because the possibility ofusingsuch a place. is very scarce: a

For the use of a world clock according to the present invention, the druntgear 1 indicating 0 to 9 minute bf the first orderis rotated amanner that the film band 9 is rotated to set the hour at a lt'isiers place'to the world standard time, after which the digits representing 00 to 59 minutes,on the drum gears 1 and 2, in combination, are set to the minute ofthe world standard time. In this connection the mark 16 provided on the aforesaid table aids in ready reading of theworld standardti'me at the place of a userv I Alternatively, the world map may be replacedby a list of names of cities or names of branch offices.

As isapparent from the foregoing description, the whole size of the world standard .time clock may be minimized to an elongated form due to the provisions of the world-standard -time-zone table which is removable from the casing of a clock, as well as due to the parallel arrangement of the film band, the shaft of gears 3, 4 and 6, and the shaft of drum gears l and 2; This permits small-sized package of a world clock with the accompanying considerable saving in transportation expense. Furthermore, theworld clock according to the present invention is simple in construction and suitable for use, particularly for oversea calls, because ofready reading of the world standard time at a desired utilizing the discoveries of the present invention can be readily anticipated by those skilled in the art from the present disclosure, and such modifications and improvements may fa ifrly be presumed to be within the 0 claims that follow.

What is claimed is: l, A digital world clock comprising: a table indicating world standard time zones, at-

' tached to the casing of a clock and including-24 equalled spaced divisions; an endless film band trained around a pair of spaced pulleys said endless film band being positioned in side-byside relation to said table for ready reference; said film bandhaving thereon two longitudinally extending juxtapositioned zones one of said zones being divided into 48 divisions each v representing an hour the other of said zones beingdivided into four parts representing sequentially night and day; whereby the run of said film band on one side is visible to a .user and indicates thereon a length of 24 I divisions representing the span of 24 hours in time as well as the parts representing night and day; said clock casing having a pair of openings; digital minute-indicating means associated with'said openings, displaying digits representing respectively 00 to 59 minutes in combination; including a pair of drums bearing said digits on their outer circumferential surfaces;

one of said drumsjattending to digits of the first order ranging fromO r69- and the other of said drums at-" tending to digits of the second order ranging from 0 to 5;

gear means interconnecting one of said pulleys and one of said drums'whereby the instant said two I drums come to positions indicating 00 minute in cojrr ibinationsaidone pulley will rotate to advance s'aid film band a longitudinal distance corresponding to one hourly division of said film band.

A digital' world clock as set forth in claim 1 wherein: m i

said table indicating world standard time zones and J said'film band are positioned in parallel to a shaft member; a face gear and a pair'ofpinion gears mounted coaxially on said shaft member; a' second face gear carried by said one pulley and meshing with said face gear on said shaft member; a notch provided in the-circumferential edge of each of said drums; and I eac'hof said pinion gears being adapted to intermittently engage" a respective one of said notches to t rotate said one drum one revolution per 10 minutes and the other of said drums o'ne revolution per hour. 1 3, A digital clock as set'forth in claim 1 wherein: said 'table consists of a rigid planar member having notches along the bottom edge and spaced-from thecorriers thereof;

scopeand purview of theinvention as defined by the said clock casing includes a pair of spaced pins protruding therefrom at the ends and spaced above said film band to engage within said notches whereby said table is detachable from said clock casing.

4. A digital world clock comprising:

a housing member having an elongated horizontal opening in one face;

an endless film band positioned to travel along said opening;

said endless film having two sets of numbers from to 23 associated with a series of vertical graduations each indicating the span of an hour;

a planar map of the world carried by said housing with one longidutinal edge contiguous to an edge of said endless film band and having vertical longitude graduations indicating hourly time zones;

a pair of left and right oriented digital minute indicator means associated with said one face of said housing;

a clock mechanism to drive said left digital minute indicator means one revolution per hour and the right indicator means one revolution per 10 minutes; and

means connecting said left digital minute indicator to intermittently drive said endless film band the distance between a pair of vertical graduations thereon in the span of one hour whereby the time in hours and minutes for each of said time zones of said planar world map is displayed.

5. A digital world clock in accordance with claim 4 wherein:

said endless film band includes sequential zones of dark and light areas therealong, the dark zones being contiguous to those hours of day normally associated with night and the light zones being contiguous to those hours of a day normally associated with daylight.

6. A digital world clock in accordance with claim 5 including:

indicia opposite the 12th hour in the light zone of said endless film band to indicate noon hour. 7. A digital world clock in accordance with claim 4 including:

indicia within one of said hour time zones of said planar world map to show the geographical location of the user of the clock.

8. A digital world clock comprising:

a housing member having an elongated horizontal opening and a pair of horizontally spaced openings in one face;

a clock mechanism within said housing including a driven shaft rotatable at one revolution per 10 minutes of time;

a first digital minute indicator drum carried by said driven shaft and positioned before the appropriate one of said spaced openings to indicate the digits 0 and 9 in spaced increments;

a second digital minute indicator drum axially associated with said first digital indicator drum and positioned before the other of said spaced openings to indicate tens of minutes 0 to 5 in spaced increments;

intermittent drive means between said first and second digital minute indicator drums to rotate said second digital minute indicator drum one revolution per hour;

an endless film band positioned to travel across said elongated opening of said housing with one side exposed to view therethrough and trained upon an idler pulley and driven pulley;

said endless digital film band having two sets of equally spaced indicia each set showing the hours 0 to 23 therealong;

a map of the world having longitudinal hourly time zone graduations therein associated with said endless film band along one edge with said time zone graduations arranged in the same direction as the spaced indicia on said film band; and

intermittent drive means connected between said second minute indicator drum and said driven pulley for said endless film band to advance said film band the distance of its spaced indicia in relation to said hourly time zone graduations on said world map for each revolution of said second digital minute indicator.

9. A digital world clock in accordance with claim 8 wherein:

said endless film band includes sequential zones of dark and light areas therealong, the dark zones being contiguous to those hours of a day associated with the night and the light zones being contiguous to those hours of a day normally associated with daylight.

10. A digital world clock in accordance with claim 9 including:

indicia opposite the 12th hour in the light zone of said endless film band to indicate the noon hour.

11. A digital world clock in accordance with claim 8 including:

indicia within one of said hour time zones of said planar world map to show the geographical location of the user ofthe clock.

Patent No.

Inventor(s) UNITED STATES PATENT CFFICE CERTIFICATE OF CORRECTION 3 918 251 .Dated NOVember ll 1975 Yasuo Wakabayashi It is certified that error appears in the above-identified patent and that Colurm 1,

Column 2,

Column 3,

Column Column [SEAL] said Letters Patent are hereby corrected as shown below:

line 47, after "representing" insert hours and the other of zone being divided into four parts representing said a line 28, before "user" delete "the" and insert a line 10, delete "meshes";

line 25, delete "kmeshes" and insert meshes line 6, in Claim 8, delete "and and insert to and line 19, in Claim 8, after "and" insert a Signed and Scaled this A fifteenth D f June 1976 Attest:

C. MARSHALL DANN (nmmissinner oflatems and Trademarks RUTH c. msou Arresting Officer Patent 53 Inventor UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION o. 3 918 251 Dated November ll 19 75 (S) Yasuo Wakab ayashi is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1,

Column 2 Colulm 3,

Column 5,

Column 6,

[SEAL] line 47, after "representing" insert hours and the other of said zone being divided into four narts representing line 28, before "user" delete "the" and insert a line 10, delete "meshes";

line 25 delete "kmeshes" and insert meshes line 15, in Claim 4, delete "longidutinal" and insert longitudinal line 6, in Claim 8, delete "and" and insert to and line 19, in Claim 8, after "and" insert a Signed and Sealed this fifteenth D8) of June 197 Arrest:

RUTH C. MASON Arresting Officer C. MARSHALL DANN Commissioner ofParems and Trademarks

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2001633 *Sep 22, 1934May 14, 1935Segovia Crispin BGeographical clock
US2417695 *Jun 8, 1946Mar 18, 1947Lewis James EInternational time and day clock
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4280207 *Feb 14, 1977Jul 21, 1981Kabushiki Kaisha Suwa SeikoshaElectronic timepiece and digital display therefor
US4972392 *Jun 8, 1989Nov 20, 1990Wang Willington L TTime conversion clock
US6275449 *Aug 7, 1998Aug 14, 2001Richard WangWorld clock with synchronous display
US8221125Aug 13, 2009Jul 17, 2012World View Time Inc.Electronic presentation of world time zones
EP0011284A2 *Nov 13, 1979May 28, 1980Yorker Research CorporationA watch for displaying multiple world times
EP0396807A1 *May 12, 1989Nov 14, 1990Willington L.T. WangTime conversion clock
EP0985986A1 *Sep 7, 1998Mar 15, 2000Richard WangWorld clock with synchronous display
Classifications
U.S. Classification368/25, 968/162, 968/167
International ClassificationG04B19/00, G04B19/22, G04B19/20
Cooperative ClassificationG04B19/22, G04B19/20
European ClassificationG04B19/20, G04B19/22