US3778997A - Clockwork mechanism for large clocks - Google Patents

Clockwork mechanism for large clocks Download PDF

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Publication number
US3778997A
US3778997A US00229091A US3778997DA US3778997A US 3778997 A US3778997 A US 3778997A US 00229091 A US00229091 A US 00229091A US 3778997D A US3778997D A US 3778997DA US 3778997 A US3778997 A US 3778997A
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hour
cam
striking
quarter
striking mechanism
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H Jauch
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/04—Indicating the time of the day
    • G04C21/06—Indicating the time of the day by striking mechanism

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  • ABSTRACT I A clockwork mechanism for clocks with chimes com- 30 F A prising a clock movement, a striking mechanism, a l 1 F orelgn pphcatmn Pnomy Data control device for the striking mechanism, a driving eb. 26, 1971 Germany P 2] 09 138.3 motor for driving the Striking mechanism and a Set of batteries for the driving motor all constituted as seper- [gf] :LSil.
  • the invention relates to a clockwork mechanism for large clocks provided with Westminister or similar chimes comprising a clock movement, a striking mechanism, a control device for the striking mechanism, a driving motor for driving the striking mechanism and a set of batteries for energizing the driving motor.
  • the clock movement, the striking mechanism, the control device, the driving motor and the set of batteries are constructed as separate construction units which are arranged in a housing.
  • a switch such as a pull and tumbler switch for deactivating the striking mechanism, can be arranged in the electric circuit of the driving motor. Consequently, this switch may be easily actuated, and the clockwork mechanism can be installed in a table clock, a wall clock or a free standing clock, so that the striking mechanism can be switched on or off according to the desire of the user.
  • control device for the striking mechanism and the mechanism for moving the hands of the clock are arranged on the front side of the a mounting plate, and the remaining units of the clockwork are mounted on the rear side ofthe plate.
  • control device for the striking mechanism.
  • This control device comprises a conventional star-like control cam, which is driven by the clock movement and is provided with three identical curved teeth and with one higher curved tooth, wherein a contact switch inserted in the electric circuit of the driving motor can be closed every quarter of an hour by said control cam and by means of a lever mechanism, and wherein said contact switch is opened after the completion of the quarter stroke as a result of rotation of a quarter-hour disc which is rigidly connected to the shaft of the striking mechanism.
  • the lever mechanism according to the invention can consist of a few simple levers, which are in contact on the one hand with the star-like control cam and on the other hand with the quarter-hour disc.
  • the quarter-hour disc is provided in proximity of its circumference with pins, which actuate the lever mechanism after the quarter-hourly stroke has been completed in such a manner that the contact switch opens.
  • the hands of the hand moving mechanism can be rotated in both the clockwise and the counterclockwise direction in order to set the clock to the correct time.
  • the star-like control cam also rotates, and, as a result, the striking mechanism departs from the proper sequence.
  • the quarter-hour disc is provided, according to still another embodiment of the invention, with a recess on its circumferential surface, in which a part attached to the lever mechanism drops at approximately the time shortly after the striking of the third quarter of an hour, and, consequently, the contact switch can be closed only after actuation of the lever mechanism by the higher curved tooth of the star-like control cam. Consequently, the striking mechanism returns to the proper sequence at the time of striking the next full hour at the latest.
  • the hour wheel of the hands moving mechanism is connected by means of interposed gear wheels with a gear wheel which is loosely supported on the shaft of the striking mechanism and is provided with pins, one of which after a full hour has been passed actuates a cam segment for starting the hour strike.
  • the cam segment is pivotably supported on the hour cam disc and is held in its starting position by means of a spring in such a manner that it disengages from contact with the hour hammer of the striking mechanism. Consequently, the pins, which are located on the gear wheel which is driven from the hour wheel by means of the interposed gear wheels, determine the number of strikes which the hour hammer makes at each occasion. After the number of strikes corresponding to the given hour has been achieved, one of these pins engages the pivotably supported cam segment in such a manner that the teeth of the cam segment can no longer actuate the hour hammer.
  • the transmission of the driving force from the hour wheel of the handle moving mechanism to the gear wheel which is loosely supported on the shaft of the striking mechanism is achieved in a preferred embodiment with three interposed wheels arranged therebetween, the transmission ratio between the hour wheel and the above gear wheel being 1:3 in total. Therefore, the gear wheel conducts a one-third rotation in the course of twelve hours.
  • three pins are provided which are equally spaced along the circumference and which serve the purpose of actuating the cam segment.
  • the hour cam disc of the striking mechanism is provided with only one rigid cam tooth for the full hour and the cam segment which is pviotably supported on this cam disc is provided with eleven additional cam teeth for actuation of the hour hammer.
  • This cam segment can be shifted between two swivel positions, wherein the eleven cam teeth can come into contact with the hour hammer in only one of these positions.
  • the cam segment can be held in this position by means of a crank which is under influence of a spring, wherein this tilted position can be secured by an ascending curved cam attached to the cam segment and abutting against a rigid stop, and the crank holding said curved segment in the above tilted position can be released by a pin of the gear wheel which is loosely supported on the shaft of the striking mechanism.
  • the crank is released, the further teeth of the curved segment can no longer actuate the hour hammer and the striking of the hour ceases after the correct number of strokes has been achieved.
  • the crank is provided with a nose, which is preferably directed inwardly and which in a position in which the crank presses the cam segment outwardly, is located in the path of the pins of the gear wheel which is loosely supported on the shaft of the striking mechanism.
  • the crank is released at the proper moment corresponding to the position of the associated pin and the cam segment drops under the influence of a spring to the position in which it is out of engagement with the hour hammer.
  • the associated pin of the gear wheel has completed its travel up to a point behind the nose, the following pin of the gear wheel comes into engagement with the nose attached to the crank always after the end of the hour striking for the next twelve hours.
  • a control curved cam is provided on one of the interposed gear wheels, which deactuates the driving motor for the duration of a time period corresponding to a predetermined difference of angular positions of this interposed gear wheel.
  • the curved control cam can actuate the lever mechanism in such a manner that the same cannot activate the striking mechanism.
  • This embodiment of the invention is particularly simple to construct and to operate, as it can be arranged at any arbitrarily chosen location on the axle of the interposed gear wheel, depending on the construction of the clock.
  • the same effect could also be achieved if, for instance, a contact switch inserted in the electric circuit of the driving motor were opened by this curved cam for a limited period of time.
  • An arbitrary selection of the time of deactivation can be achieved by making the control curved cam displaceable in the direction of rotation on the interposed gear wheel or on its axle.
  • An adjustment ofthe duration of the period of deactivation can be achieved by utilizing two curved control cams which are attached to the gear wheel and are displaceable in relation to each other and to the gear wheel in the direction of rotation. The first curved control cam determines the beginning and the other the end of the period of deactivation.
  • FIG. 1 is a schematic view of the clockwork mechanism from the rear of a mounting plate supporting the clockwork mechanism;
  • FIG. 2 is a schematic view from the front of the single mounting plate
  • FIG. 3 is a schematic view, slightly simplified. of the striking mechanism
  • FIG. 4 is a cross-section taken approximately along line IV-IV in FIG. 3;
  • FIG. 5 is a cross-sectional view taken approximately along the line V--- ⁇ / in FIG. 3, showing the striking mechanism shortly before the beginning of the full hour stroke;
  • FIG. 6 is a cross-sectional view corresponding to that of FIG. 5, but in a position shortly before the first quarter-hour stroke.
  • the structure of the clockwork mechanism for large clocks according to the invention can be clearly seen from FIG. 1, showing the various single structural units, which are attached to a single mounting plate located behind the plane of the drawing.
  • the various single structural units are simplified in FIG. 1, and they are shown as separate blocks.
  • the entire clockwork mechanism is composed of a clock movement 10, a striking mechanism 12 with hammers 14, a driving motor 16 for the striking mechanism and a set of batteries 18 for energizing the driving motor 16 and the clock movement.
  • the movement 10 can be of arbitrary shape ad construction, such as clock movements which are commonly marketed at the present, e.g., balance wheel clocks or even pendulum clocks.
  • the striking mechanism is mounted in such a position that its hammers 14 are able not only to strike horizontally arranged gong rods, but also vertically arranged gong rods in which case the hammer support arms are bent upwardly to the position 20 as shown in'chain-dotted lines in FIG. 1.
  • a switch 22 which serves the purpose of deactivation of the striking mechanism and which is inserted in the electric circuit of the driving motor 16 in a manner which is not shown in detail, is provided as a tumbler and pull switch.
  • the set of batteries which can energize both the drive of the clock movement and the driving motor of the striking mechanism preferably is not rigidly connected to the body of the clockwork, but is located at an easily accessible place in the housing, for instance, at the inner surface of the door of the housing.
  • the batteries are connected to the clockwork mechanism by means of flexible wires provided with disconnectible plugs.
  • the front side of the mounting plate 24 is schematically shown in FIG. 2, whereas the rear side of the plate with the structural units attached to the same is shown in FIG. 1.
  • the set of batteries 18 can be either rigidly connected to this mounting plate or attached at any other, easily accessible location in the housing of the clock, as already mentioned above.
  • the clock movement of hand moving mechanism is provided in a conventional manner with an hour wheel 26, which meshes with a first interposed gear wheel 28, which in turn is operatively connected to with a second interposed gear wheel 30, which meshes a third interposed gear wheel 32 (shown in FIG. 4) in a manner which is not shown in greater detail.
  • the third interposed wheel 32 meshes with a gear wheel 36 which is loosely supported on a shaft 34 of the striking mechanism, the transmission ratios being chosen in such a manner that the gear wheel 36 has a 1:3 ratio in respect to the hour wheel 26.
  • the gear wheel 36 rotates one third of a revolution in the course of one full rotation of the hour wheel.
  • a second ring gear 42 of the hour wheel meshes in a conventional manner with an interposed wheel 46 by means of a drive 44, wherein the interposed wheel 46 drives a star-like curved cam 48 provided with three curved teeth 50 of identical height and a curved tooth 52 with a larger height.
  • the transmission ratios are chosen in such a manner that the starlike curved cam is subject to one rotation per hour.
  • a roller 54 is mounted on a lever 58 which is rotatably supported on an axle 56, the roller 54 following the cam teeth 50 and 52, and, as a result of this movement, the lever 58 acts on a flange 60 abutting the lever 58, the flange being integral with a lever 62 which is tiltable about the same axle 56 as lever 58.
  • both levers 58 and 62 are pivoted in the counter-clockwise direction.
  • an additional lever 66 attached to the lever 62 by joint 64 is pivoted in a direction which extends downwardly and to the right against the opposition of a return spring 68.
  • the lever 58 and the flange 60 of the lever 62 are urged into abutment by means of a spring 70.
  • a quarter-hour disc 74 is attached to the striking mechanism shaft 34 below the lever 66 and the disc 74 is provided with four quarter-hour pins 76 which have successively increasing spacing.
  • the lever 66 is retracted upwardly and to the left by means of spring 68, and it pulls, by its central projection, 78, the lever 84 in the same direction whereby the lever 84 closes a contact switch 88 by means of an upper pin 86.
  • the switch closure connects the driving motor 16 to the voltage source. However, the driving motor is energized only if the switch 22, which is inserted in its electric circuit, is closed.
  • the quarter-hour disc 74 which is connected thereto starts to move in the counter-clockwise direction.
  • the second quarter-hour pin 76 presses against the nose 72 of the lever 66 toward the end of the first quarter-hour period, and lifts the lever 66.
  • the central pin 80 of the lever 84 disengages from the projection 78 and the lever 84 drops back and opens the contact switch 88.
  • the driving motor stops.
  • the same process is repeated for successive quarter-hour periods.
  • the number of quarter-hour strokes changes as a result of the increasing mutual distance of the quarter-hour pins 76.
  • the quarter-hour disc 74 rotates by more than one half of its entire rotation during the stroke of any full hour so as to reach the first quarter-hour pin.
  • the number of the hour strokes to be sounded at each occasion is determined by the striking mechanism itself in a manner which will be explained hereafter in greater detail.
  • the setting and adjustment of the exact time can be effected in the counter-clockwise, as well as in the clockwise direction. If the hands are rotated in the counter-clockwise direction, the star-like control cam also rotates in the same direction. As a result of this, only the lever 58 is lifted, and drops again on the flange 60 of the lever 62 under the influence of the spring 70. Consequently, the additional levers 66 and 84 of the lever mechanism are not actuated.
  • the striking mechanism will be brought out of the proper sequence in respect to the time shown by the hands of the clock, since the position of the star-like control cam 48 in relation to the quarter-hour disc 74 has been changed by moving the hands, and, moreover, the driving motor 16 is first actuated for a short period of time by the lever 84 during the clockwise rotation of the hands, and is stopped only by the next following quarter-hour pin 76.
  • the quarter-hour disc 74 is provided on its circumference with a recess 90.
  • the lever 84 rests by means of an inner pin 92 against the circumferential surface of the quarter-hour disc 75, and in the course of every hour, after finishing the three-quarter-hour stroke, it drops into recess 90.
  • the central pin of the lever 84 moves such a distance from the projection 78 of the lever 66 that only the high curved tooth 52 of the star-like control cam 48 can move the lever 66 by means of the levers 58 and 62 so far that it can drop behind the central pin 80 of the lever 84 by its tooth 78.
  • a fine adjustment of the lever mechanism can be achieved by means of an eccentric stop 94 for the lever 62, which stop is rotatably supported by the single mounting plate 24.
  • the driving motor 16 is detachably connected to the striking mechanism 12 in a manner which is not shown so that use can be made of various available units not only for economic reasons, but also for reason of repair, as the motor is probably the apparatus most likely to be subject to breakdown.
  • the clock movement 10 is also replaceable in a similar manner and for similar purposes.
  • the control device according to the invention makes possible a particularly simple additional device for deactivating the striking mechanism, for example, for the duration of the night hours.
  • the interposed wheel 30 rotates once in the course of 24 hours, and a sector member 98 provided with a curved surface 96 is attached to wheel 30 so as to be rotatable about an axle 100.
  • a screw 102 is attached to the interposed gear wheel 30 and extends in a circular slot 104 of the sector member 98. By tightening the screw 102, the sector member 98 can be fastened in any arbitrary position to the wheel 30.
  • the length of the curved surface 96 corresponds to the duration of deactivation of the striking mechanism.
  • the sector member 98 can be divided into two parts, which can be displaced in relation to each other, so that even the duration of deactivation of the striking mechanism can be predetermined.
  • the curved surface 96 can lift the lever 66 sufficiently high, by means of a roller 106 attached to the lever 66, so that the lever 66 can no longer actuate the lever 84 by projection 78. Consequently, the striking mechanism is put out of operation.
  • the curved surface 96 could also, for instance, directly open a contact switch inserted in the electric circuit of the driving motor 16 for a certain period of time.
  • the deactivation of the striking mechanism could be arbitrarily made or anulled by means of a further switch (not shown) and which could be arranged in parallel to the contact switch.
  • This control device can also be provided on a different location at the axle 100, so that it is accessible from the rear.
  • FIGS. 3 to 6 The construction and control of the striking mechanism are shown in FIGS. 3 to 6.
  • the quarter-hour discs 108 and the hour cam disc 110 are seated on the striking mechanism shaft 34.
  • the quarter-hour hammers 112 and the hour hammer 120 are actuated by these cam discs.
  • Another cam (not shown) can be connected to the hour hammer 120, which lifts the single quarterhour hammers simultaneously with the hour hammer, so that a chord is produced in the course of each full hour stroke.
  • the arrangement of the hour cam disc 110 on the common axle of the striking mechanism with the quarter-hour cam discs 108 differs from conventional striking mechanisms.
  • the hour striking mechanism has its own main spring or its own chain as a driving means and the power source and is released by the high tooth of the star-like switching cam in cooperation with the quarter-hour striking mechanism.
  • the three interposed wheels 28, 30 and 32 are needed in the clockwork mechanism according to the invention, said wheels representing the connection between the hour wheel 26 of the hand moving mechanism and the gear wheel 36 loosely supported on the shaft 34 of the striking mechanism.
  • the gear wheel 36 rotates by one-third of its total rotation in the course of twelve hours.
  • Three pins 116 are equispatially located along the circumference of the gear wheel 36 and these pins change their positions in exactly 12 hours. These pins 116 produce the following effect.
  • the hour cam disc 110 is provided, as shown in FIGS. and 6, with a rigid tooth 118 for the full hour.
  • the tooth 118 actuates a tooth 122 rigidly connected to the hour hammer 120, and, as a result of this engagement, l hour stroke is accomplished.
  • the teeth 124 for the hour strokes of two to 12 are located on a cam segment 126, which is therefore, provided with a total of eleven teeth 124 which are mutually equally spaced.
  • the cam segment 126 is pivotable about an axle 128 and is supported on the hour cam disc 110, and provided with an ascending curved cam surface 130 at its end opposite the teeth 124.
  • the cam segment 126 is tilted from the position shown in FIG. 6 into the position shown in FIG. 5, while a crank 134 engages a pin 136 of the cam segment 126 and consequently, holds the segment in this position.
  • the crank 134 is also rotatably supported on the hour cam disc by means of axle 138, and is pressed against the pin 136 by means of a spring 140.
  • the teeth 124 of the cam segment 126 actuate the hour hammer in this position.
  • the ascending curved cam travels along the stop 132 in the course of the duration of the fourth-quarter stroke and lifts the cam teeth 124 to the operative position, i.e., to the elevation of the rigid tooth 118.
  • the position of the first pin 116 engaging the nose 142 of the crank 134 determines the amount of hour strokes which can be effected in each specific hour stroke.
  • the gear wheel 36 rotates, as can be seen from the above explanation, by exactly a 10 angle which is the distance between the teeth 124, so that one more tooth 124 is allowed to actuate the hour hammer 120 every hour, before the cam segment 126 drops back. This continues until the 12th hour is reached. For 1 oclock, the following pin 116 comes into action in such a manner that the cam segment 126 forcedly projected by means of the ascending curved cam 130 is allowed to fall back immediately, before its first tooth 124 can engage the hour hammer 120.
  • the driving motor 16 which is also attached to the base plate 24, drives the striking mechanism shaft 34 by means of a gear 148, on which shaft the quarter-hour disc 74 is also attached.
  • the representation of the control device which is located on the left side of the base plate 24 in FIG. 3, is significantly simplified and is not to scale.
  • a striking mechanism for a clock comprising a time gear train for moving the hands of the clock including an hour wheel, a striking control mechanism responsive to said time gear train for actuating said striking mechanism, said striking mechanism comprising hammers for sounding at the quarter hour and hour, respectively, cam discs for actuation of said hammers including an hour cam disc with a single tooth on the periphery thereof for actuating the first stroke of the hour sounding hammer, a shaft mounting said cam disc, a motor for driving said shaft, said motor being intermittently actuated by said striking control mechanism, a gear wheel loosely mounted on said shaft, a gear train driven by said hour wheel for driving said gear wheel at a transmission ratio of l to 3 relative to said hour wheel, said gear wheel having three pins mounted thereon in equally spaced angular relation, a cam segment pivotally mounted on said hour cam disc and having a peripheral surface with eleven hammer actuating teeth thereon, means biasing said cam segment to a first position out of cooperation with said hour hammer, means
  • a mechanism according to claim 1 comprising a clock movement and a set of batteries for the driving motor, and driving motor and the set of batteries being constituted as separate units and means supporting the units on a common mounting structure.
  • a mechanism according to claim 2 comprising an electric circuit for the driving motor including a switch means for activating the striking mechanism.
  • control mechanism for the striking mechanism comprises a star-like control cam driven by the clock movement and including three identical curved teeth and one higher curved tooth, a contact switch inserted in the electric circuit of the driving motor and a lever mechanism between the control cam and contact switch to close the switch every quarter of an hour, said striking mechanism including a shaft, a quarter-hour disc rigidly connected, to open the switch after the completion of the quarter-hour stroke, to said shaft of the striking mechanism and coupled to the lever mechanism.
  • a mechanism according to claim 8 comprising a control curved cam on one of said interposed wheels for deactivating the driving motor for a time period corresponding to the difference of angular positions of this interposed wheel.
  • control curved cam is attached to one of the interposed wheels so as to be capable of being adjustably displaced in the direction of rotation.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
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US00229091A 1971-02-26 1972-02-24 Clockwork mechanism for large clocks Expired - Lifetime US3778997A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2109138A DE2109138C3 (de) 1971-02-26 1971-02-26 GroBuhrwerk mit Westminsterschlag oder dergl. Spielwerk und mittels Batterie angetriebenem Getriebemotor für das Schlagwerk

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US3778997A true US3778997A (en) 1973-12-18

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US00229091A Expired - Lifetime US3778997A (en) 1971-02-26 1972-02-24 Clockwork mechanism for large clocks

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US (1) US3778997A (de)
CA (1) CA947982A (de)
DE (1) DE2109138C3 (de)
FR (1) FR2126432B1 (de)
GB (1) GB1341147A (de)
IT (1) IT948594B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943700A (en) * 1973-04-04 1976-03-16 Erhard Jauch Large-sized clockwork with an electrically driven striking train
US4232511A (en) * 1977-08-29 1980-11-11 Seiko Koki Kabushiki Kaisha Time detecting device for a clock
US4247933A (en) * 1978-07-20 1981-01-27 Rhythm Watch Company Limited Time striking device for timepiece
US4358838A (en) * 1979-08-22 1982-11-09 Rhythm Watch Company Limited Electronic timepiece with a time striking device
US5959527A (en) * 1997-05-22 1999-09-28 Woodstock Percussion, Inc. Time triggered chime
US6126308A (en) * 1998-02-18 2000-10-03 Keininger Uhrenfabrik Gmbh Chain wheel assembly unit for the weight movement of a clock
US20080192585A1 (en) * 2005-03-31 2008-08-14 Yves Corthesy Timepiece Comprising a Minute Repeater Mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2609871C2 (de) * 1976-03-10 1982-05-27 Kieninger & Obergfell Fabrik für technische Laufwerke und Apparate, 7742 St Georgen Elektrisches Schlagwerk

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1322216A (en) * 1916-05-15 1919-11-18 Mcclintock Loomis Company Chime-clock.
US1409622A (en) * 1919-11-01 1922-03-14 Ansonia Clock Co Automatic synchronizing mechanism for chime clocks
US1414253A (en) * 1920-05-20 1922-04-25 Brunner Albert Electric chime clock
US1960521A (en) * 1932-12-05 1934-05-29 Ingraham E Co Signal clock

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1510894A (fr) * 1966-10-25 1968-01-26 Jaz Sa Générateur de signaux horaires

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1322216A (en) * 1916-05-15 1919-11-18 Mcclintock Loomis Company Chime-clock.
US1409622A (en) * 1919-11-01 1922-03-14 Ansonia Clock Co Automatic synchronizing mechanism for chime clocks
US1414253A (en) * 1920-05-20 1922-04-25 Brunner Albert Electric chime clock
US1960521A (en) * 1932-12-05 1934-05-29 Ingraham E Co Signal clock

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943700A (en) * 1973-04-04 1976-03-16 Erhard Jauch Large-sized clockwork with an electrically driven striking train
US4232511A (en) * 1977-08-29 1980-11-11 Seiko Koki Kabushiki Kaisha Time detecting device for a clock
US4247933A (en) * 1978-07-20 1981-01-27 Rhythm Watch Company Limited Time striking device for timepiece
US4358838A (en) * 1979-08-22 1982-11-09 Rhythm Watch Company Limited Electronic timepiece with a time striking device
US5959527A (en) * 1997-05-22 1999-09-28 Woodstock Percussion, Inc. Time triggered chime
US6126308A (en) * 1998-02-18 2000-10-03 Keininger Uhrenfabrik Gmbh Chain wheel assembly unit for the weight movement of a clock
US20080192585A1 (en) * 2005-03-31 2008-08-14 Yves Corthesy Timepiece Comprising a Minute Repeater Mechanism
US7773463B2 (en) * 2005-03-31 2010-08-10 Lvmh Swiss Manufactures Sa Timepiece comprising a minute repeater mechanism

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Publication number Publication date
FR2126432A1 (de) 1972-10-06
DE2109138C3 (de) 1975-07-03
CA947982A (en) 1974-05-28
GB1341147A (en) 1973-12-19
IT948594B (it) 1973-06-11
DE2109138A1 (de) 1972-08-31
FR2126432B1 (de) 1977-07-15
DE2109138B2 (de) 1973-04-05

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