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
  • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
  • G04B19/243—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator
  • G04B19/247—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars characterised by the shape of the date indicator disc-shaped
  • G04B19/253—Driving or releasing mechanisms
  • G04B19/25333—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement
  • G04B19/25353—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork movement
  • G04B19/2536—Driving or releasing mechanisms wherein the date indicators are driven or released mechanically by a clockwork movement driven or released stepwise by the clockwork movement automatically corrected at the end of months having less than 31 days
• • 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
  • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
• • 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
  • G04B19/24—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars
  • G04B19/241—Clocks or watches with date or week-day indicators, i.e. calendar clocks or watches; Clockwork calendars the date is indicated by one or more hands

Definitions

• the present invention relates to a mechanical Hijri calendar, particularly for use in analog timepieces. More specifically, it relates to a perpetual Hijri calendar that can be fitted into the movement of a wristwatch, a clock, or a pocket watch.
• the Hijri calendar is a widely used modern lunar calendar. This calendar is characterized by years of 12 lunar months, which are shorter than solar years. Each Hijri year has approximately 354 days, or sometimes 355 days, consisting of 12 months of 29 and 30 days. Odd-numbered months have 30 days and even-numbered months have 29, meaning the year begins with a 30-day month and ends with a 29- or 30-day month. In reality, a Hijri year is slightly longer than 354 days. To compensate for this difference, the last month of some years in a 30-year correction cycle has 30 days instead of 29. This 30-year cycle includes 19 years of 354 days, called common years, and 11 years of 355 days, called abundant years.
• EP0606576 on behalf of the plaintiff describes a Hijri calendar for analog clock movement, comprising a date indicator with 30 positions advancing by one position to successively display the numbers 1, 2... 29, 30, 1, 2....
• the calendar includes a first mechanism whose function is to drive, from a moving part of the movement, at the end of each day, the date indicator by a single step, a second mechanism cooperating with said first mechanism and whose function is to drive, at the end of even months, the date indicator by two successive steps to move it from the 29th to the 1st of the following month in a short interval of time.
• the calendar also includes a third mechanism cooperating with the other two mechanisms and whose function is to temporarily neutralize the action of the second mechanism at the end of abundant years, defined by a 30-year correction cycle, so that the date indicator displays 30 on the last day of the 12th and last month of said years.
• WO2015062839 on behalf of the plaintiff describes a Hijri calendar for a clock movement including a 30-position date indicator advancing by one position to successively display the numbers 1, 2... 29, 30, 1, 2...
• the calendar includes a first date-driving mechanism whose function is to drive, from a wheel of the movement, at the end of each day, the date indicator by a single step, a second mechanism for correcting the length of months arranged to cooperate with said first date-driving mechanism in order to drive, at the end of months of 29 days, the date indicator by two successive steps to move it from the 29th of one month to the 1st of the following month, the second mechanism for correcting the length of months comprising a month cam having six bumps and six hollows, each hollow defining a position of the month cam corresponding to a month of 29 days and each bump defining a position of the month cam corresponding to a month of 30 days.
• the calendar also includes a third blocking mechanism that works in conjunction with the other two mechanisms and whose function is to temporarily neutralize the action of the second mechanism, which corrects the length of months, at the end of the twelfth month of abundant years, defined by a 30-year correction cycle.
• the third blocking mechanism is arranged so that, during the last month of said abundant years, it locks the month cam in a position corresponding to a 30-day month, so that the date indicator displays 30 on the last day of the twelfth and final month of said abundant years.
• the present invention proposes a simplified Hijri calendar which displays the dates respecting the alternation of months of 29 and 30 days in a year, and the succession of common years and abundant years on one of the 30-year correction cycles.
• a Hijri calendar for a mechanical clock movement comprises a 30-position date indicator that advances in one-position increments to successively and cyclically display the numbers 1 to 30, 1, 2... at the end of each day, said date indicator being arranged to be driven by a date-driving mechanism and to cooperate with a large rocker; a month control mechanism arranged to distinguish between months with 29 days and months with 30 days, the month control mechanism comprising a month star cooperating with a month cam comprising twelve positions; a year control mechanism arranged to distinguish between a bountiful year and a common year; and a year control mechanism.
• the Hijri calendar according to the invention is characterized in that the large lever is arranged to cooperate in a common year with a day star to advance two teeth of the day star to move from the 29th to the 1st of the following month, the large lever resting on the month cam.
• the arrangement of the large rocker makes it possible to simplify the movement by avoiding the need to integrate a locking mechanism as is known from the prior art.
• a locking lever pivoting around an axis should be integrated, having at one end a feeler applied against the year cam, and at the other end a locking finger.
• the locking lever is arranged so that, during a lean year, the feeler is positioned on a bump of the year cam, and the locking finger is abutted against a lug provided on the eleventh bump of the month cam, thus blocking and disengaging the month cam and preventing its pivoting when transitioning to the twelfth month of the lean year.
• the locking lever is positioned so that the locking finger does not impede the pivoting of the month cam when transitioning to the twelfth month of the common year.
• the large seesaw is arranged to cooperate with the finger so as to make a tooth pop off the star of days for the transition from the 30th to the 1st of the month during an abundant year.
• the finger is mounted pivoting around an axis and having at one end a beak arranged to receive a point of the large seesaw in each abundant year.
• the cam of the years has eleven irregularly distributed flattened teeth.
• a sector of the years is arranged to make a star of the years jump one step every year according to a 30-year cycle.
• a Hijri calendar for a mechanical clock movement includes a 30-position date indicator that advances in one-position increments to successively and cyclically display the numbers 1 to 30, 1, 2... at the end of each day, said date indicator being arranged to be driven by a date-driving mechanism and to cooperate with a large rocker 7.
• the calendar also includes a month control mechanism 1, 4 arranged to distinguish between months with 29 days and months with 30 days, the month control mechanism having a month 1 star cooperating with a month 4 cam having twelve positions.
• the calendar further includes a year control mechanism arranged to distinguish an abundant year from an ordinary year, the year control mechanism having a year sector 10 arranged to skip a year star 5 coupled to a year cam 6 having flattened teeth 12 and having a resting surface 13 (see figure 2 ) on each flattened tooth 12 on which a finger 8 rests for each abundant year, the finger 8 resting on a hollow part 14 between two flattened teeth 12 to indicate a common year.
• the great seesaw 7 is arranged to cooperate with a star of days 9, to move two teeth of the star of days 9 to move from the 29th to the 1st of the following month, the great seesaw 7 relying on the cam of months 4.
• the star of month 1 via links 2 and 3, positions the cam of month 4.
• a sector of year 10 advances the star of year 5 by one step per year according to a thirty-year cycle.
• finger 8 positions itself, in its lower position, within the hollow of the cam of year 6, outside the range of the point 7a of the large rocker 7.
• the large rocker 7 advances two teeth of the star of days 9, moving from the 29th to the 1st of the following month.
• the day star 9 has twenty-nine flat teeth 17 and one pointed tooth 18 indicating the transition to a new cycle of days in a month.
• the great seesaw 7 is arranged to cooperate with the finger 8 in such a way as to make a tooth jump, the star of days 9 for the passage from the 30th to the 1st of the month.
• the position of the month 4 cam indicates that the year is bountiful.
• finger 8 is located on the top of the year 6 cam.
• the large rocker 7 no longer rests on the month 4 cam, but on finger 8, causing the day 9 star to jump one tooth, for the transition from the 30th to the 1st of the following month.
• the 6-year-old cam has eleven flattened teeth 12 irregularly distributed.
• the finger 8 is mounted pivoting around an axis 15 and has at one end a beak 16 arranged to receive a point 7b of the large rocker 7 in each abundant year.
• a rocker 19 probes the month cam 4 to determine whether the current month is a month of 29 days or 30 days, depending on the twelve positions represented on said month cam.
• a disc 20 thanks to two distinct indications, here two different colors, indicates to the bearer, through an opening 21 of the day window 22, whether the month has a duration of 29 or 30 days.
• the rocker 19 is arranged to cooperate with a toothed section of the disc 20, which pivots on the axis of the day star 9 and allows the 29/30 indication to be displayed through the day window.
• the rocker 19 moves the disc 20 from a first position where it indicates a month of 29 days to a second position where it indicates a month of 30 days, the rocker 19 bearing against the month cam 4.
• the 20 dot is positioned to indicate a month with a duration of 29 days.
• the rocker 19 probes the month 4 cam positioned to determine that the current month is a month of a duration of 30 days.
• the 20 disc is positioned to indicate to the bearer, through the opening 21 of the day window 22, that the current month is a month of 30 days.
• finger 8 In a bountiful year, finger 8 is located on the top of the year 6 cam. Rocker 19 no longer rests on the month 4 cam, but on finger 8 and allows the display of the month of a duration of 30 days through the day window.
• Such a calendar can be incorporated into a timepiece, such as a wristwatch or a clock.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Electromechanical Clocks (AREA)
• Electric Clocks (AREA)

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Citations (2)

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• 2020
  • 2020-06-03 CH CH00655/20A patent/CH717492A1/fr unknown
• 2021
  • 2021-06-03 WO PCT/IB2021/054849 patent/WO2021245581A1/fr not_active Ceased
  • 2021-06-03 EP EP25203486.3A patent/EP4647854A3/de active Pending
  • 2021-06-03 EP EP21730672.9A patent/EP4162327B1/de active Active
  • 2021-06-03 CN CN202180038573.1A patent/CN115917443B/zh active Active
  • 2021-06-03 US US18/000,234 patent/US12498672B2/en active Active
• 2022
  • 2022-11-24 SA SA522441439A patent/SA522441439B1/ar unknown

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