EP2241944A2 - Unverzögerter Zähl-Mechanismus und Kurvenscheibe für diesen Mechanismus - Google Patents

Unverzögerter Zähl-Mechanismus und Kurvenscheibe für diesen Mechanismus Download PDF

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Publication number
EP2241944A2
EP2241944A2 EP10003428A EP10003428A EP2241944A2 EP 2241944 A2 EP2241944 A2 EP 2241944A2 EP 10003428 A EP10003428 A EP 10003428A EP 10003428 A EP10003428 A EP 10003428A EP 2241944 A2 EP2241944 A2 EP 2241944A2
Authority
EP
European Patent Office
Prior art keywords
snail cam
counter
cam
snail
chronograph
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.)
Granted
Application number
EP10003428A
Other languages
English (en)
French (fr)
Other versions
EP2241944B1 (de
EP2241944A3 (de
Inventor
Pierre-Maurice Rochat
Philip Barat
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.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
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 Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Publication of EP2241944A2 publication Critical patent/EP2241944A2/de
Publication of EP2241944A3 publication Critical patent/EP2241944A3/de
Application granted granted Critical
Publication of EP2241944B1 publication Critical patent/EP2241944B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
    • G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
    • G04F7/08—Watches or clocks with stop devices, e.g. chronograph
    • G04F7/0804—Watches or clocks with stop devices, e.g. chronograph with reset mechanisms

Definitions

  • the present invention relates to an instant counter mechanism of a chronograph.
  • the invention relates to an instant minute counter of a chronograph comprising a snail cam driven in rotation by an axis which carries a second hand cooperating with a graduation of chronograph seconds.
  • a counter of minutes counter subjected to the action of a return spring, has a spout bearing on the periphery of the snail cam and a ratchet of minutes cooperating, under the action of a pawl spring carried by the minute rocker, with the toothache teeth of a chronograph minute counter wheel.
  • This phenomenon does not exist during the reset in the clockwise direction because in this case the axis of the second exceeds the neutral position of rest, the heart lifting the hammer, an angle of about 60 °, this axis returning in the opposite direction and thus performing two or three oscillations around its zero position defined by the heart and the hammer.
  • the stop of the axis of the seconds is thus damped for a reset in the clockwise direction which is, of course, not possible for a reset in the counterclockwise direction because of the abrupt stop of the snail cam against the spout of the minute counter rocker.
  • the object of the present invention is to provide a mechanism for driving an instantaneous chronograph counter, in particular an instantaneous minute counter, thanks to which the second hand is not subjected to a sudden stop during the resetting in the anti-clockwise direction to avoid the inconvenience.
  • the present invention relates to an instantaneous counter mechanism comprising a snail cam driven in rotation by an axis which carries a needle cooperating with a graduation and a chronograph wheel for its drive; a counter rocker, subjected to the action of a spring, having a probe bearing on the periphery of the snail cam and a pawl cooperating under the action of a pawl spring with the teeth in wolf teeth of a counter wheel; characterized in that the snail cam has a slot, extending over an arc portion c of between 30 ° and 90 °, separating from the central body of the snail cam an end portion whose end forms the highest part H of the snail cam.
  • the present invention also relates to a snail cam, characterized in that it comprises an end portion, the end of which constitutes the highest point H of the snail cam, separated from the central part of the snail cam by a slot.
  • the control mechanism of the instant chronograph minute counter wheel 1 is illustrated in FIG. figure 1 .
  • the minute counter wheel, not shown, is held between successive actuations in angular positions determined by a jumper, not shown.
  • This control mechanism comprises a minute counter latch 1, pivoted at O on a support, having a probe 2 cooperating with a snail cam 3 mounted on and driven by the chronograph axis 4, this latch 1 is subjected to action of a return spring, not shown, tending to apply its nose 2 against the snail cam 3.
  • This chronograph axis 4 carries at its upper end the chronograph seconds hand 5 and is integral with the chronograph wheel 6 and the reset heart of the second chronographs 7.
  • the minute counter rocker 1 comprises a drive pawl 8 pivoted on the free end of this rocker 1 and subjected to the action of a pawl spring 9 integral with the rocker 1, tending to apply the nozzle 10 of the pawl 8 drive against the teeth in wolf teeth of the chronograph minute counter wheel.
  • the pawl 8 carries by its spout 10 chronograph minute counter wheel step.
  • the chronograph seconds axis 4 comprises an axial abutment 11 adjoining a first large-diameter bearing surface 12, a second bearing surface 13 of smaller diameter than the first one 12 on which the chronograph wheel 6 is force-driven. thus making it integral with the chronograph axis 4.
  • a third scope 14, smaller in diameter than the second 13, serves as a centering pin in the court 7 reset. This core 7 is driven away or fixed with an eccentric screw 15 on the chronograph wheel 6.
  • the opposite end of the chronograph axis 4 carries the chronograph second hand 5.
  • the snail cam 3 of the minute counter can be frictionally mounted on the first bearing 12 of the chronograph axis 4 and is sandwiched between the axial stop 12 of the chronograph axis 4 and the lower face of the chronograph wheel 6.
  • This snail cam 3 comprises a light 16 in which is engaged the finger 17 of an eccentric 18 pivoted in the chronograph wheel 6.
  • the angular position of this eccentric 18 is modified the angular position of the snail cam 3 relative to the chronograph axis 4 which allows to adjust the angular positioning of this snail cam 3 very precisely so that the spout 2 of the instant chronograph minute counter rocker 1 falls from the high part H of the snail cam 3 on its lower part h exactly when the chronograph seconds hand 5 passes the origin of the graduation with which it cooperates, indicating O respectively 60 seconds.
  • the snail cam 3 of the present mechanism comprises a particular shape.
  • the lower part h of the snail cam 3 extends substantially concentrically along an arc length c extending from about 30 ° to 90 °.
  • the snail cam 3 has a slot or gap 20 between the end portion 21 of the snail cam 3 leading to its highest part H and the central part of this snail cam 3.
  • the tip of the probe 2 of the counter minute counter 1 has a countersink 22 giving passage to the end portion 21 of the snail cam.
  • this countersink of the nose of the probe 2 could be replaced by a bent or folded shape of said spout 2.
  • the probe 4 of the instantaneous counter rocker 1 no longer encounters a fixed stop, but the rotation of the mobile seconds is slowed by the action of the hammer on the heart 7 and stabilizes at the zero position after a few oscillations.
  • the angular length of the slot 20 is optimized according to the force of the hammer springs and the angle required for the chronograph wheel 6 so that the snail cam 3 does not offer a fixed stop to the probe 2 of the latch Instant minute counter 1.
  • This angle varies according to the mechanical design of the instant minute counter. It is generally between 30 ° and 90 ° but is preferably between 70 ° and 80 ° or substantially equal to 60 °.
  • the present invention also relates to a snail cam 3 having between its central portion and its end portion 21, where is located the highest part H of the cam, a slot 20 intended to let the spout 2 of the counter latch This slot 20 extends over an angle of 30 ° to 90 °, preferably from about 70 ° to 80 ° or even substantially equal to 60 °.
EP10003428.9A 2009-04-15 2010-03-30 Unverzögerter Zähl-Mechanismus Active EP2241944B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00602/09A CH700753B1 (fr) 2009-04-15 2009-04-15 Mécanisme de compteur instantané et came escargot pour un tel mécanisme.

Publications (3)

Publication Number Publication Date
EP2241944A2 true EP2241944A2 (de) 2010-10-20
EP2241944A3 EP2241944A3 (de) 2016-12-07
EP2241944B1 EP2241944B1 (de) 2018-02-21

Family

ID=42110353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10003428.9A Active EP2241944B1 (de) 2009-04-15 2010-03-30 Unverzögerter Zähl-Mechanismus

Country Status (2)

Country Link
EP (1) EP2241944B1 (de)
CH (1) CH700753B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH707233A1 (de) * 2012-11-22 2014-05-30 Eterna Ag Uhrenfabrik Minutzenzähler einer Uhr, insbesondere eines Chronographen.
WO2018091696A1 (fr) 2016-11-17 2018-05-24 Nogerah Sa Mecanisme d'affichage avec fonction de remise a zero
EP3598243A1 (de) 2018-07-19 2020-01-22 Patek Philippe SA Genève Uhrmechanismus mit organ, das sich in sprüngen bewegt
EP3598242A1 (de) 2018-07-19 2020-01-22 Patek Philippe SA Genève Uhrwerksmechanismus mit nocke
EP3907563A1 (de) 2020-05-07 2021-11-10 Patek Philippe SA Genève Uhrwerkmechanismus, das ein schwenkorgan umfasst

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB720618A (en) * 1952-06-16 1954-12-22 British Thermostat Co Ltd Improvements in or relating to fluid-metering devices
GB2394520B (en) * 2002-09-14 2005-12-14 Jonathan Barnett Improved snail cam
CH702137B1 (fr) * 2007-02-05 2011-05-13 Patek Philippe Sa Geneve Dispositif d'entraînement et de réglage d'un compteur instantané et pièce d'horlogerie comportant un tel dispositif.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH707233A1 (de) * 2012-11-22 2014-05-30 Eterna Ag Uhrenfabrik Minutzenzähler einer Uhr, insbesondere eines Chronographen.
JP2016502081A (ja) * 2012-11-22 2016-01-21 エテルナ アーゲー ウーレンファブリク 時計、特にクロノグラフの分針
WO2018091696A1 (fr) 2016-11-17 2018-05-24 Nogerah Sa Mecanisme d'affichage avec fonction de remise a zero
US11300927B2 (en) 2016-11-17 2022-04-12 Nogerah Sa Display mechanism with zero reset function
EP3598243A1 (de) 2018-07-19 2020-01-22 Patek Philippe SA Genève Uhrmechanismus mit organ, das sich in sprüngen bewegt
EP3598242A1 (de) 2018-07-19 2020-01-22 Patek Philippe SA Genève Uhrwerksmechanismus mit nocke
WO2020016818A1 (fr) 2018-07-19 2020-01-23 Patek Philippe Sa Geneve Mecanisme horloger a came
EP3907563A1 (de) 2020-05-07 2021-11-10 Patek Philippe SA Genève Uhrwerkmechanismus, das ein schwenkorgan umfasst

Also Published As

Publication number Publication date
EP2241944B1 (de) 2018-02-21
EP2241944A3 (de) 2016-12-07
CH700753B1 (fr) 2014-03-14
CH700753A2 (fr) 2010-10-15

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