US3823552A - Digital clock - Google Patents

Digital clock Download PDF

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Publication number
US3823552A
US3823552A US00339213A US33921373A US3823552A US 3823552 A US3823552 A US 3823552A US 00339213 A US00339213 A US 00339213A US 33921373 A US33921373 A US 33921373A US 3823552 A US3823552 A US 3823552A
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US
United States
Prior art keywords
minutes
tens
drum
geneva
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00339213A
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English (en)
Inventor
R Boyles
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US00339213A priority Critical patent/US3823552A/en
Priority to GB906374A priority patent/GB1455859A/en
Priority to CH307274A priority patent/CH585423B5/xx
Priority to CH307274D priority patent/CH307274A4/xx
Priority to DE2410759A priority patent/DE2410759A1/de
Priority to FR7408070A priority patent/FR2220819B1/fr
Priority to JP49027628A priority patent/JPS5026572A/ja
Application granted granted Critical
Publication of US3823552A publication Critical patent/US3823552A/en
Priority to HK498/77A priority patent/HK49877A/xx
Assigned to BLACK & DECKER, INC., A CORP. OF DE reassignment BLACK & DECKER, INC., A CORP. OF DE ASSIGNS AS OF APRIL 27, 1984 THE ENTIRE INTEREST Assignors: GENERAL ELECTRIC COMPANY A NY CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G04B19/21—Drums

Definitions

  • ABSTRACT A digital clock wherein minutes, tens of minutes, and hours display indicators are rotated by a motor in order to bring successive numerals into position behind a viewing window 82.
  • Geneva gears 113 and 115 are grouped at the left of the numerals for driving an hours drum 56 and a tens of minutes numeral drum 58, and the drums are uniquely supported with respect to each other so that they may be driven by a motor 8 which is located at the right of the numerals.
  • This invention relates to a digital clock, and more particularly to a mechanism for supporting and indexing hours, tens of minutes, and minutes numerals of such a digital clock.
  • an indexing gear mechanism is located inside of a numeral drum for moving the drum from one position to another position.
  • This invention is concerned with such drive mechanisms for digital clocks and timers, and more particularly, to a gear and driving arrangement which is uniquely constructed so that the numeral drums may be positioned relatively close to each other in order to minimize, unsightly spaces between the drums. It is also desirable to provide an inexpensive driving arrangement for such a digital clock.
  • a digital clock includes a rotatable minutes drum having an elongated shaft fixed thereto.
  • a rotatable tens of minutes drum is also provided with a relatively long shaft and is mounted on the shaft of the minutes drum in coaxial arrangement therewith.
  • a geneva wheel is fixed to an end portion of the tens of minutes shaft for driving the tens of minutes shaft and the tens of minutes drum which is fixed thereto.
  • a tens of minutes geneva driver cam is positioned adjacent to the tens of minutes geneva wheel and is arranged for meshing engagement with the tens of minutes geneva wheel.
  • a gear having conventional gear teeth is integrally formed with the tens of minutes geneva driver cam, and another gear having conventional gear teeth is fixed to the minutes shaft.
  • the conventional gear of the minutes shaft is arranged in meshing engagement with the conventional gear which is integrally formed with the tens of minutes geneva driver cam.
  • This construction also permits the minutes drum and the tens of minutes drum to be positioned relatively close to each other in order to minimize unsightly spaces between the drums.
  • Both the minutes shaft and the tens of minutes shaft are elongated so that the geneva wheel, the geneva driver and the two conventional 7 gears may all be positioned substantially to one side of not only the minutes drum and the tens of minutes drum but also an hours drum.
  • a minutes, tens of minutes, and hours drum may be readily mounted and positioned within a digital clock relatively close to each other without unsightly spaces between the drums.
  • the drive mechanism for the tens of minutes drum is also quite simple and has relatively few parts which may be readily manufactured and assembled to each other.
  • the tens of minutes geneva wheel may be readily fixed to an end portion of the elongated tens of minutes shaft while the conventional gear which is fixed to the minutes shaft may be positioned immediately adjacent to and coaxial with the tens of minutes geneva wheel.
  • the gearing between the minutes shaft and the tens of minutes geneva driver may include a conventional gear which is integrally formed with the geneva driver cam.
  • the gears, geneva wheels and geneva drivers are positioned relatively close to each other, and thus, a very compact, exceedingly simple, reliable, and readily manufactured digital clock has been achieved.
  • FIG. I is a front perspective view of a digital clock constructed in'accordance with my invention.
  • FIG. 2 is a front perspective view generally similar to FIG. I with the outer casing removed for purposes of illustration;
  • FIG. 3 is a fragmentary exploded front perspective view of the clock illustrated in FIGS. 1 and 2;
  • FIG. 4 is a front elevational view of the clock shown in FIG. 2;
  • FIG. 5 is a cross-sectional view of the clock taken substantially on the plane of 55 of FIG. 4;
  • FIG. 6 is a cross-sectional view of the digital clock taken substantially on the plane of 6-6 of FIG. 4 show ing one of the numeral pages being flipped to display a numeral on the other side of the page;
  • FIG. 7 is a crosssectional view of the clock also taken on the plane of 6-6 of FIG. 4 showing the numeral pages in a difi'erent operating position;
  • FIG. 8 is a cross-sectional view of the clock taken substantially on the plane of 8-8 of FIG. 4;
  • FIG. 9 is a cross-sectional view of the clock taken substantially on the plane 99 of FIG. 4 showing the details of construction of a drive finger and detent lever arrangement for advancing a minutes drum from one position to a next succeeding position and for holding the minutes drum in an accurate viewing position, the parts being shown with the detent lever holding the ratchet wheel of the minutes indicator member in an accurate viewing position;
  • FIG. 10 is a cross-sectional view of the digital clock also taken substantially on the plane of 99 of FIG. 4 showing the drive finger arrangement with the finger holding the detent lever away from the ratchet wheel while the finger moves the ratchet wheel from one position to a next succeeding position;
  • FIG. 11 is a cross-sectional view of the digital clock also taken substantially on the plane of 9-9 of FIG. 4 showing the finger gradually lowering the detent lever onto one of the teeth of the ratchet wheel;
  • FIG. 12 is an enlarged partial cross-sectional view of the tens of minutes and hours geneva mechanism taken substantially on the plane 5-5 of FIG. 4.
  • FIGS. 1 and 2 there is shown a digital clock which includes my unique and simplified mechanism for supporting minutes, tens of minutes, and hours display indicators, and a unique mechanism for driving the tens of minutes and hours display indicators.
  • the digital clock numerals may conveniently include three sets of pages 2, 4 and 6 for indicating minutes, tens of minutes, and hours, respectively.
  • the digital clock may be driven by a conventional self-starting synchronous motor 8 having a magnetic core 10 and energizing coil 12. As shown in FIG. 2, the motor may be readily attached to an end plate 14 of the clock by means of screws 16 and 18 or other suitable securing means, and as shown in FIG. 5, an output shaft 20 of the motor extends through an aperture 22 which is formed in the end plate 14.
  • the minutes numerals 2 are printed or otherwise formed on both sides of five pages 24, 26, 28, 30 and 32, and the pages are pivotally mounted on flanges 34 and 36 of a rotatable minutes drum 38.
  • a generally similar arrangement is used for the hours display indicator 6. l2 numerals are required for the hours display, and this is accomplished by using six panels 40, 42, 44, 46, 48 and 50, which are pivotally mounted on flanges 52 and 54 of a rotatable hours drum 56.
  • a tens of minutes display indicator 4 requires six digits, and thus, the tens of minutes numerals may be made the same size as the hours and minutes numerals without the use of flippable pages that have numerals on both sides of the pages. As shown more particularly in FIGS. 3 and 5, the tens of minutes numerals are conveniently positioned on the outer surface of a six sided tens of minutes drum 58.
  • a minutes spool drum 38 is fixed to a centrally positioned shaft 64 by means of knurling 66 or other suitable connecting means. As shown, the shaft 64 extends a considerable distance to the left of the spool and is supported for rotation within a bearing 61 which is formed in a stub shaft 63 which is fixed to a plate 112.
  • the right end portion of the minutes shaft 64 is formed with a bearing surface 74 which is supported within a bearing 76 which is integrally formed with end plate 60.
  • the supporting plate 60 may be formed of plastic or other suitable material, and it includes an outwardly extending portion 80 for integrally connecting the bearing portion 76 with the main portion of the supporting plate.
  • the tens of minutes drum 58 is fixed to a hollow support shaft 68 which is mounted for rotation on the minutes shaft 64, and the hours drum 56 is supported for rotation on the hollow shaft 68 of the tens of minutes drum 58.
  • the minutes drum 38 is quickly indexed from one numeral position to a next succeeding numeral position in about five seconds of time, and it is held in appropriate positions to display numerals midway between the upper and lower edges of a viewing window 82, illustrated in FIG. 1.
  • a ratchet wheel 84 having five teeth may be integrally formed with the minutes drum 38 for incrementally driving the minutes drum and the shaft 64 which is fixed to it.
  • a drive finger 96 is eccentrically mounted for rota tion with respect to the ratchet wheel 84 to engage and move one tooth of the ratchet wheel for each revolution of the drive finger 96.
  • the drive finger 96 may be integrally formed on a reduction gear unit 98 which is positioned between the output shaft 20 of the electric motor 8 and the ratchet wheel 84.
  • the reduction gear unit 98 is supported between plates 60 and 104 on a shaft 100 which is integrally formed with the reduction gear unit.
  • the shaft 100 is mounted for rotation within apertures 102 and 103 which are provided in mounting plates 60 and 104, respectively.
  • the apertures 102 and 103 are located somewhat rearwardly of the axis of the ratchet wheel 84 in order to provide the desired eccentricity between the ratchet teeth 86, 88, 90, 92 and 94, and the drive finger 96.
  • the output pinion 20 of the motor drives a gear 106 of the integrally formed reduction gear unit 98 to move the drive finger 96 at one revolution per minute.
  • the drive finger 96 will remain in engagement with a tooth of the ratchet wheel 84 for about 30 of travel of the reduction gear unit, and accordingly, movement of the minutes drum 38 from one position to a next succeeding position will occur in the relatively short span of about 5 seconds.
  • a spring loaded detent lever 108 is provided for holding the ratchet wheel 84 in any one of a plurality of numeral positions.
  • the tens of minutes drum 58 and the hours drum 56 are quickly indexed from one numeral position to a next succeeding numeral position by a geneva mechanism 110.
  • the geneva mechanism 111) is located at the left of the numerals and is readily supported and positioned on the digital clock without substantially increasing the overall size of the clock.
  • a mounting plate 112 is arranged generally parallel to mounting plate 62 for supporting a pair of geneva driver cams 114 and 116 therebetween. As shown more particularly in FIG. 12, the geneva driver cams 114 and 116 are coaxial with each other and are supported on a common shaft 117.
  • the geneva driver cam 116 is integrally formed to include a pair of driving fingers 120 and 122, a toothed gear 124, a hollow shaft portion 126, and a pinion gear portion 128 at the left portion of shaft 126.
  • Geneva driver cam 114 is integrally formed to include a driving finger 130, a toothed gear 134, and a generally circular sleeve bearing 136 which is supported for rotation on the coaxial shaft 126 of the integrally formed geneva driver cam 116.
  • the shaft 126 is fonned to include a central hollow cylindrical bearing surface 136 for receiving shaft 117.
  • the supporting shaft 117 may be positioned within apertures 119 and 121 which are formed in plates 119 and 62, respectively, and readily held between the plates for supporting the geneva driver cams 114 and 116.
  • the geneva driver cam 114 is arranged for driving a tens of minutes geneva wheel 115 while the geneva driver cam 116 is arranged for driving an hours geneva wheel 113.
  • the geneva wheel 113 is integrally formed with the hours drum 56 for indexing the hours drum one increment every hour, and the generally similar geneva wheel 115 is fixed to the hollow shaft 68 of the tens of minutes drum 58 for indexing the tens of minutes drum one increment every tenminutes.
  • the pair of geneva driver cams 114 and 116 are positioned behind the geneva wheels 113 and 115, respectively, for driving the geneva wheels, and thus, the geneva wheels and the geneva drivers form a compact arrangement which does not increase the overall height of the clock.
  • a gear 140 is fixed to the minutes shaft 64 for driving the geneva mechanism 110 to advance the hours drum 56 one increment every hour and to advance the tens of minutes drum 58 one increment every minutes.
  • Gear 140 is arranged in mesh with gear 134 of the tens of minutes geneva driver cam 114, and with one driving finger 130 on the geneva driver cam 114, the gearing ratio between gears 140 and 134 will enable the timing motor 8 to rotate the geneva driver cam 114 once every l0 minutes.
  • the geneva driver finger 130 will be moved into one of the notches on the geneva wheel 115 to rotate the tens of minutes geneva wheel 115 one increment every 10 minutes.
  • a gear 144 is integrally formed with the tens of minutes geneva wheel 115 for driving the hours geneva driver cam 124.
  • Gear 144 is arranged in mesh with gear 124 and with two driving fingers and 122 on the hours geneva driver cam 116 the gear ratio between gear 144 and gear 124 of the hours geneva driver cam is arranged so that the hours geneva driver cam makes one revolution every 2 hours. Accordingly, one of the driving fingers 120 or 122 is moved into one of the notches of the geneva gear 113 once every hour to move the hours drum 56 once every hour.
  • the minutes drum 38 rotates shaft 64 and gear at two revolutions every 10 minutes.
  • Gear 140 is arranged in mesh with gear 134 which is integrally formed with the tens of minutes geneva driver cam 114, and thus, the tens of minutes geneva driver cam 114 drives the tens of minutes geneva wheel 115 and the tens of minutes drum 144 at one increment every 10 minutes and one revolution per hour.
  • the gear 144 which is integrally formed with the tens of minutes geneva wheel 115 is in mesh with the gear 124 of the hours geneva driver cam, and thus, the hours geneva driver cam 116 is rotated to move the hours geneva wheel 113 one increment every hour.
  • the geneva driver cams 114 and 116 are coaxially mounted with respect to each other to include a common supporting shaft 117 and integrally formed toothed gears 124 and 134 which are arranged in mesh with gears 140 and 144 for inexpensively driving the geneva mechanism.
  • the geneva wheels 113 and 115 are readily fonned and coaxially positioned with respect to each other. Geneva wheel 113 is integrally formed with the hours drum 56, while the tens of minutes geneva wheel 115 is integrally formed with a gear 144 for driving the hours geneva driver cam 116.
  • a very compact geneva driving mechanism at the left side of the numerals is achieved.
  • no driving mechanisms are positioned between the numeral drums and the drums may be located relatively close to each other without having unsightly large spaces between the drums.
  • a compact low profile digital clock is constructed.
  • TIME SET A mechanism for rotating the minutes, tens of minutes, and hours drums 38, 58 and 56, respectively, to set the hours, minutes and tens of minutes numerals may be readily incorporated with the digital clock mechanism thus far described.
  • a time set gear 146 may be positioned in mesh with gear 140.
  • gear 146 is supported on a shaft 148 which may be conveniently fixed to mounting plate 62.
  • a portion of gear 146 may extend through the casing of the clock, as shown in FIG.
  • the geneva driving mechanism 114 is also uniquely designed so that it may readily drive an alarm mechanism 160.
  • the hours geneva driver cam 1 16 is driven at six revolutions every 12 hours, and thus, it may be readily utilized for driving a 12 hour cam gear 162 of a 12 hour alarm mechanism.
  • the hours geneva driver cam 116 is fixed to an elongated shaft 126 which extends through the tens of minutes geneva driver cam 114, and a conventional gear 128 is integrally formed on the left end portion of shaft 126. As shown in FIG. 5, gear 128 is arranged in mesh with the 12 hour cam gear 162 to drive the cam gear 162 at one revolution every 12 hours.
  • Conventional 12 hour alarm cam mechanisms include two coaxially mounted gears which are provided with interacting cams for causing relative axial movement of the gears at a present alarm time for actuating a switch or other alarm mechanism.
  • the cam gear 162 may be formed with two leftwardly extending projections 163 and 165 for cooperating with slots 164 and 166 which may be formed in a manually adjustable alarm set cam 168.
  • my geneva driving mechanism 110 is uniquely constructed so that it may readily drive an alarm mechanism without the use of additional parts.
  • Thegear 128 for driving the alarm mechanism is integrally formed with the hours geneva driver shaft 126 at the same time that the drivefingers 120 and 122 and the other portions of the hours geneva driver cam are being formed.
  • a digital clock comprising:
  • a rotatable minutes drum having an elongated shaft fixed thereto;
  • a rotatable tens of minutes drum having a shaft fixed thereto, said tens of minutes drum and said tens of minutes shaft being coaxial with and mounted for rotation on said minutes shaft;
  • an integrally formed gear and tens of minutes geneva driver cam positioned outwardly from said minutes drum and said tens of minutes drum for driving said tens of minutes drum, said tens of minutes geneva driver cam mounted for meshing engagement with said tens of minutes geneva wheel;
  • a gear positioned outwardly from said minutes drum and said tens of minutes drum coaxial with and fixed to said minutes shaft in meshing engagement with the gear integrally formed with said tens of minutes geneva driver cam for driving said tens of minutes geneva driver cam and said tens of minutes geneva wheel.
  • a digital clock comprising:
  • a rotatable tens of minutes drum having a shaft fixed thereto, said tens of minutes drum and said tens of minutes shaft being mounted for rotation on said minutes shaft;
  • a digital clock as defined in claim 4 wherein said geneva driver cams are located between two supporting plates, a shaft is fixed between said supporting plates, and both of said geneva driver cams are coaxially mounted on said shaft.
  • a digital clock as defined in claim 3 wherein a gear is arranged in meshing engagement with the gear on said minutes shaft for setting the minutes, hours, and tens of minutes drums.
  • a digital clock comprising:
  • a rotatable minutes drum having an elongated shaft fixed thereto, said shaft having two end portions;
  • a rotatable tens of minutes drum having an elongated shaft fixed thereto, said tens of minutes drum and said tens of minutes shaft being mounted for rotation on said minutes shaft;
  • an hours drum mounted for rotation on said tens of minutes shaft, said tens of minutes shaft and said minutes shaft extending coaxially through a central bearing portion of said hours drum;
  • an integrally formed gear and tens of minutes geneva driver cam positioned outwardly from said minutes drum and said tens of minutes drum for driving said tens of minutes drum, said tens of minutes geneva driver cam mounted for meshing engagement with said tens of minutes geneva wheel;
  • a gear positioned outwardly from said minutes drum and said tens of minutes drum coaxial with and fixed to said minutes shaft in meshing engagement with the gear integrally formed with said tens of minutes geneva driver cam for driving said tens of minutes geneva driver cam and said tens of minutes geneva wheel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Displays For Variable Information Using Movable Means (AREA)
  • Transmission Devices (AREA)
US00339213A 1973-03-08 1973-03-08 Digital clock Expired - Lifetime US3823552A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00339213A US3823552A (en) 1973-03-08 1973-03-08 Digital clock
GB906374A GB1455859A (fr) 1973-03-08 1974-02-28
CH307274D CH307274A4 (fr) 1973-03-08 1974-03-05
CH307274A CH585423B5 (fr) 1973-03-08 1974-03-05
DE2410759A DE2410759A1 (de) 1973-03-08 1974-03-06 Uhr mit digitaler zeitanzeige
FR7408070A FR2220819B1 (fr) 1973-03-08 1974-03-08
JP49027628A JPS5026572A (fr) 1973-03-08 1974-03-08
HK498/77A HK49877A (en) 1973-03-08 1977-09-22 Digital clock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00339213A US3823552A (en) 1973-03-08 1973-03-08 Digital clock

Publications (1)

Publication Number Publication Date
US3823552A true US3823552A (en) 1974-07-16

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ID=23328000

Family Applications (1)

Application Number Title Priority Date Filing Date
US00339213A Expired - Lifetime US3823552A (en) 1973-03-08 1973-03-08 Digital clock

Country Status (7)

Country Link
US (1) US3823552A (fr)
JP (1) JPS5026572A (fr)
CH (2) CH307274A4 (fr)
DE (1) DE2410759A1 (fr)
FR (1) FR2220819B1 (fr)
GB (1) GB1455859A (fr)
HK (1) HK49877A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875740A (en) * 1974-05-28 1975-04-08 Gen Electric Am-pm indicator for 24 hour clock
US3922843A (en) * 1973-06-16 1975-12-02 Suwa Seikosha Kk Cyclometer clock
US3953965A (en) * 1974-10-18 1976-05-04 Kabushiki Kaisha Tamura Denki Seisakusho Digital clock
US4060972A (en) * 1976-04-08 1977-12-06 Matsushita Electric Works, Ltd. Digital clock
US4108355A (en) * 1975-10-06 1978-08-22 Copal Company Limited Rotary indicating device provided with a plurality of indicating plates
GB2267367B (en) * 1992-05-27 1995-07-26 Richard Frederic Stannard Clock

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55114982A (en) * 1979-02-27 1980-09-04 Seiko Koki Kk Alarm time and time set unit in digital clock
CH700744B1 (fr) * 2009-04-07 2014-01-31 Francis Gerber Ruban sans fin et pièce d'horlogerie à affichage par un tel ruban.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130873A (en) * 1938-02-23 1938-09-20 Warren Telechron Co Rotating dial numeral clock
US2191616A (en) * 1937-11-10 1940-02-27 Veeder Root Inc Register mechanism
US2351814A (en) * 1939-10-30 1944-06-20 Holzner Adolf Cyclometer clock
US2576119A (en) * 1945-05-28 1951-11-27 Holzner Adolf Wall and desk cyclometer clock
US2636339A (en) * 1949-03-02 1953-04-28 Holzner Adolf Cyclometer indicator mechanism for twenty-four hour cyclometer clocks
US2651167A (en) * 1948-07-09 1953-09-08 Ibm Direct read secondary clock and correction mechanism therefor
US3611705A (en) * 1970-02-02 1971-10-12 Bunker Ramo Digital clock with novel indexing drums

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2191616A (en) * 1937-11-10 1940-02-27 Veeder Root Inc Register mechanism
US2130873A (en) * 1938-02-23 1938-09-20 Warren Telechron Co Rotating dial numeral clock
US2351814A (en) * 1939-10-30 1944-06-20 Holzner Adolf Cyclometer clock
US2576119A (en) * 1945-05-28 1951-11-27 Holzner Adolf Wall and desk cyclometer clock
US2651167A (en) * 1948-07-09 1953-09-08 Ibm Direct read secondary clock and correction mechanism therefor
US2636339A (en) * 1949-03-02 1953-04-28 Holzner Adolf Cyclometer indicator mechanism for twenty-four hour cyclometer clocks
US3611705A (en) * 1970-02-02 1971-10-12 Bunker Ramo Digital clock with novel indexing drums

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922843A (en) * 1973-06-16 1975-12-02 Suwa Seikosha Kk Cyclometer clock
US3875740A (en) * 1974-05-28 1975-04-08 Gen Electric Am-pm indicator for 24 hour clock
US3953965A (en) * 1974-10-18 1976-05-04 Kabushiki Kaisha Tamura Denki Seisakusho Digital clock
US4108355A (en) * 1975-10-06 1978-08-22 Copal Company Limited Rotary indicating device provided with a plurality of indicating plates
US4060972A (en) * 1976-04-08 1977-12-06 Matsushita Electric Works, Ltd. Digital clock
GB2267367B (en) * 1992-05-27 1995-07-26 Richard Frederic Stannard Clock

Also Published As

Publication number Publication date
FR2220819B1 (fr) 1978-09-29
HK49877A (en) 1977-09-30
FR2220819A1 (fr) 1974-10-04
CH585423B5 (fr) 1977-02-28
JPS5026572A (fr) 1975-03-19
GB1455859A (fr) 1976-11-17
DE2410759A1 (de) 1974-09-19
CH307274A4 (fr) 1976-08-13

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Owner name: BLACK & DECKER, INC., 1423 KIRKWOOD HIGHWAY NEWARK

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