US3918251A - Digital world clock - Google Patents

Digital world clock Download PDF

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Publication number
US3918251A
US3918251A US458214A US45821474A US3918251A US 3918251 A US3918251 A US 3918251A US 458214 A US458214 A US 458214A US 45821474 A US45821474 A US 45821474A US 3918251 A US3918251 A US 3918251A
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United States
Prior art keywords
film band
digital
clock
world
zones
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Expired - Lifetime
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US458214A
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English (en)
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Yasuo Wakabayashi
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Individual
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Individual
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/20—Indicating by numbered bands, drums, discs, or sheets
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B19/00—Indicating the time by visual means
    • G04B19/22—Arrangements for indicating different local apparent times; Universal time pieces
    • G04B19/228—Arrangements for indicating different local apparent times; Universal time pieces with linear time graduation

Definitions

  • 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.
  • drum type digital world clock may be a right solution to this problem, butsuch has not been disclosed so far.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • the mark 16 provided on the aforesaid table aids in ready reading of theworld standardti'me at the place of a userv I
  • the world map may be replacedby a list of names of cities or names of branch offices.
  • 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.
  • 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.
  • a digital world clock comprising: a table indicating world standard time zones, at-
  • 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.
  • 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.
  • said 'table consists of a rigid planar member having notches along the bottom edge and spaced-from thecorriers thereof;
  • 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.
  • a digital world clock comprising:
  • a housing member having an elongated horizontal opening in one face
  • 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 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.
  • a digital world clock in accordance with claim 5 including:
  • 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.
  • 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;
  • said endless digital film band having two sets of equally spaced indicia each set showing the hours 0 to 23 therealong;
  • 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.
  • 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.
  • a digital world clock in accordance with claim 9 including:
  • 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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
US458214A 1973-04-12 1974-04-05 Digital world clock Expired - Lifetime US3918251A (en)

Applications Claiming Priority (1)

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JP1973043181U JPS49144267U (enrdf_load_stackoverflow) 1973-04-12 1973-04-12

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US3918251A true US3918251A (en) 1975-11-11

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011284A3 (en) * 1978-11-13 1980-11-26 Yorker Research Corporation A watch for displaying multiple world times
US4280207A (en) * 1976-02-12 1981-07-21 Kabushiki Kaisha Suwa Seikosha Electronic timepiece and digital display therefor
EP0396807A1 (en) * 1989-05-12 1990-11-14 Willington L.T. Wang Time conversion clock
FR2770914A1 (fr) * 1997-11-07 1999-05-14 Marcel Herve Dispositif d'indication d'heures et minutes dans le monde
EP0985986A1 (en) * 1998-08-07 2000-03-15 Richard Wang World clock with synchronous display
US20030156497A1 (en) * 2002-02-20 2003-08-21 America America Ltda World timepieces comprising different hour hands
US20110151415A1 (en) * 2008-08-14 2011-06-23 World View Time, Inc. Electronic presentation of world time zones
CN102914961A (zh) * 2012-10-31 2013-02-06 苏州斑马工业设计有限公司 电子时区钟
CN110568746A (zh) * 2019-08-28 2019-12-13 徐纯武 一种世界时钟

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2001633A (en) * 1934-09-22 1935-05-14 Crispin B Segovia Geographical clock
US2417695A (en) * 1946-06-08 1947-03-18 James E Lewis International time and day clock

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4115337Y1 (enrdf_load_stackoverflow) * 1964-01-22 1966-07-18

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2001633A (en) * 1934-09-22 1935-05-14 Crispin B Segovia Geographical clock
US2417695A (en) * 1946-06-08 1947-03-18 James E Lewis International time and day clock

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280207A (en) * 1976-02-12 1981-07-21 Kabushiki Kaisha Suwa Seikosha Electronic timepiece and digital display therefor
EP0011284A3 (en) * 1978-11-13 1980-11-26 Yorker Research Corporation A watch for displaying multiple world times
EP0396807A1 (en) * 1989-05-12 1990-11-14 Willington L.T. Wang Time conversion clock
US4972392A (en) * 1989-05-12 1990-11-20 Wang Willington L T Time conversion clock
FR2770914A1 (fr) * 1997-11-07 1999-05-14 Marcel Herve Dispositif d'indication d'heures et minutes dans le monde
EP0985986A1 (en) * 1998-08-07 2000-03-15 Richard Wang World clock with synchronous display
US6275449B1 (en) * 1998-08-07 2001-08-14 Richard Wang World clock with synchronous display
US20030156497A1 (en) * 2002-02-20 2003-08-21 America America Ltda World timepieces comprising different hour hands
US20110151415A1 (en) * 2008-08-14 2011-06-23 World View Time, Inc. Electronic presentation of world time zones
US8221125B2 (en) 2008-08-14 2012-07-17 World View Time Inc. Electronic presentation of world time zones
CN102914961A (zh) * 2012-10-31 2013-02-06 苏州斑马工业设计有限公司 电子时区钟
CN110568746A (zh) * 2019-08-28 2019-12-13 徐纯武 一种世界时钟

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JPS49144267U (enrdf_load_stackoverflow) 1974-12-12

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