US3673792A - Device for the magnetic arresting of a switch wheel of a timekeeping device - Google Patents

Device for the magnetic arresting of a switch wheel of a timekeeping device Download PDF

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Publication number
US3673792A
US3673792A US122942A US3673792DA US3673792A US 3673792 A US3673792 A US 3673792A US 122942 A US122942 A US 122942A US 3673792D A US3673792D A US 3673792DA US 3673792 A US3673792 A US 3673792A
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US
United States
Prior art keywords
switch
permanent magnet
operable
fork
magnet
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
US122942A
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English (en)
Inventor
Gunther Scholz
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.)
Gebrueder Junghans GmbH
Original Assignee
Gebrueder Junghans GmbH
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Filing date
Publication date
Application filed by Gebrueder Junghans GmbH filed Critical Gebrueder Junghans GmbH
Application granted granted Critical
Publication of US3673792A publication Critical patent/US3673792A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G04HOROLOGY
    • G04CELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C5/00Electric or magnetic means for converting oscillatory to rotary motion in time-pieces, i.e. electric or magnetic escapements
    • G04C5/005Magnetic or electromagnetic means
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00Click devices; Stop clicks; Clutches
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B11/00Click devices; Stop clicks; Clutches
    • G04B11/02Devices allowing the motion of a rotatable part in only one direction
    • G04B11/04Pawl constructions therefor, e.g. pawl secured to an oscillating member actuating a ratchet
    • GPHYSICS
    • G04HOROLOGY
    • G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B15/00Escapements
    • G04B15/06Free escapements
    • G04B15/08Lever escapements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/15Intermittent grip type mechanical movement
    • Y10T74/1502Escapement

Definitions

  • the invention relates to a device for the magnetic arresting of a switch wheel of a timekeeping device.
  • a permanent magnet arrangement has been provided which acts upon the teeth of a switch means, or on a part in engagement with the switch means, and arrests the switch means between consecutive continuous processes.
  • the switch wheel In the case of a timepiece, for example, a balance clock which is driven electromagnetically without contact, the switch wheel is driven step-by-step by a movement regulating oscillator. In this timepiece, the switch wheel must be held firmly between the individual continuous advancing steps. This firm holding or arresting can be accomplished for example in a magnetic way.
  • a timepiece has been known where the switch wheel consists of ferromagnetic material and where a permanent magnet bar, magnetized in an axial direction and pointed toward the teeth of the switch wheel, has been arranged on a bed plate.
  • an arresting means may act upon the armature fork.
  • a fork made of ferromagnetic material which has two prongs separated from one another by a nonmagnetic part, for example an air gap. Each prong, in each end position of the fork, faces a bar-shaped, fixed permanent magnet.
  • the permanent magnet produces a large stray field, which exerts an unfavorable influence on the isochronism behavior of the movement regulator. As a result of this, small irregular jumps in the movement may occur.
  • the object of the invention is the production of an arrangement of the initially mentioned type, which can be produced with very small dimensions and nevertheless will assure a safe arresting.
  • the permanent magnet arrangement consists of a barshaped permanent magnet and a pot-like return clement encircling the permanent magnet.
  • a stop magnet devised in such a way can be produced with extraordinarily small dimensions.
  • the straying is kept at a minimum.
  • a permanent magnet arrangement developed in such a way can be housed practically in every watch case.
  • the pennanent magnet arrangement preferably is axially shiftable for the purpose of adjusting the holding force in the direction of the part cooperating with it.
  • mount the bar-like permanent magnet so that it is axially shiftable in relation to the pot-shaped return element, whereby, for example, the pot-shaped return element may be fixedly mounted.
  • the pot-shaped return element may be fixedly mounted.
  • a combination of these mountings may be employed to provide greater control over the axial and lateral extent of field stray.
  • the permanent magnet may, for example, consist of a platinum-cobalt alloy.
  • the part cooperating with the permanent magnet arrangement may consist of nonmagnetic body material coated with a layer consisting of ferromagnetic material with high permeability.
  • FIG. 1 shows in plan view the stop arrangement according to the invention in which a stop magnet acts upon a switch armature fork;
  • FIG. 2 shows a side view of the arrangement according to FIG. 1, partly in section;
  • FIG. 3 shows a stop arrangement according to the invention in which a stop magnet acts directly on the teeth of a switch wheel.
  • FIG. 1 a switch or armature fork has been designated by 10.
  • Pork 10 has been swivelably mounted in a bed plate 11 Y with the help of an axle 16.
  • the swiveling movement of switch fork 10 is limited by stops l4 and 15.
  • a slit 13 has been provided in the part 10c of the switch fork, with which a peg engages.
  • This peg would be arranged on a movement regulating oscillator, for example, a balance, and would move the fork 10 alternatingiy into one of the two end positions as determined by stop means 14 and 15.
  • switch wheel 19 is mounted on a shaft 21 which carries a pinion, which has not been shown and which engages with the drive mechanism of the hands.
  • a look wheel 20, connected with wheel 19, can be provided additionally on the shaft 21.
  • a lock spring 22 has been provided with a jewel 23 engaging with teeth of the periphery of lock wheel 20 so as to provide a type of ratchet control in relation to the rotation of means 12-20.
  • the arresting or restraining of the switch fork 10 in its end position is achieved with the aid of a permanent magnet arrangement 24/25.
  • This arrangement acts upon the two prongs 10d and 10e, i.e., in each of the end positions of the fork v10, on one of the above mentioned prongs.
  • the permanent magnet arrangement 24/25 acts upon the prong l0e.
  • the switch fork 10 may consist of a ferromagnetic material.
  • the body of switch fork 10 may consist of a nonmagnetic material, such as for example beryllium, and the switch fork 10 in the area of the permanent magnet arrangement 24/25 may be coated with a covering 26 of ferromagnetic raw material with high permeability.
  • the permanent magnet arrangement consists of a bar-like permanent magnet 24, which is magnetized in an axial direction, and a pot-shaped return element or shroud means 25 made of ferromagnetic raw material of high permeability.
  • the permanent magnet bar 24 may consist for example of a platinum-cobalt alloy.
  • the end 25a of pot 25 is disposed in engaged or contiguous relation with one pole end of magnet 24.
  • the other pot end 25b, and over half of the annular body of pot 25 extending upwardly therefrom, is spaced outwardly from the body of magnet 24 by a non-magnetic gap 250 which may comprise an air gap. This gap insures the desired axial intensity of the magnetic field extending from the magnetic into movement restraining cooperation with fork portions 100 or 10d.
  • a largely closed magnetic circuit is created by the return element 25 completely encircling the permanent magnet 24, and the coating 26 of ferromagnetic material arranged on the switch fork 10, as a result of which a stray field has been largely avoided.
  • the permanent magnet arrangement 24/25 has extraordinarily small dimensions, so that it can be housed practically anywhere.
  • the arrangement 24/25 may be shifted, for example, in toto in an axial direction in the direction of the part cooperating with it, in order to adjust the holding force.
  • numeral 30 designates the body of the balance, which has been arranged on the axle 31, and has been mounted between two bed plates in the customary manner.
  • Balance '30 can contain, for example, a permanent magnet which cooperates with coils, not shown in the drawing.
  • an angular switch spring 32 has been attached which continues to switch, by one tooth, the switch wheel 33 upon every oscillation of the balance.
  • the switch wheel 33 consists of a ferromagnetic material with high permeability.
  • the teeth 33a of the switch wheel are engaged by the switch spring 32.
  • the switch wheel has been mounted on an axle 34, which carries a pinion not shown. This pinion engages with the driving mechanism for the hands, likewise not shown.
  • a permanent magnet arrangement 34/35 has been arranged on a bed plate 36 and acts upon the teeth 33a of the switch wheel 33 and to incrementally restrain or stop the switch wheel.
  • the permanent magnet arrangement 34/35 has been built in the same way as the permanent magnet arrangement according to FIGS. 1 and 2, and therefore it does not need to be described here in more detail.
  • the switch wheel 33 of a nonmagnetic material and to provide sections made of ferromagnetic material on the switch wheel teeth 33a on the side of the switch wheel 33 opposite the permanent magnet arrangement 34/35.
  • a major advantage of the invention resides in the provision of a uniquely small magnetic restraining device in a time piece which generates an effectively directed and intensified magnetic restraining field.
  • a further advantage resides in the use of a pot-like shroud means which facilitates axial adjustment of the shroud means and/or magnet so as to adjust the magnetic field.
  • a timepiece according to claim 1 further including:
  • said switch means comprises an armature fork
  • said fork is disposed in driving engagement with a switch wheel
  • said timepiece further including spaced stops operable to limitpivoting movement of said fork;
  • said switch means includes non-magnetic body means, and
  • ferromagnetic means coating at least a portion of said body means and operable to arrestingly cooperate with said magnet means.
  • a timepiece comprising:
  • arresting means operable to periodically arrest movement of said switching means and includes magnet means, and
  • shroud means disposed generally peripherally adjacent said magnet means and extending generally between pole defining portions thereof;
  • non-magnetic gap means interposed laterally between said magnet means and said shroud means at one pole defining end of said magnet means operable to face a portion of said switching means and arrest movement thereof; another pole defining end of said magnet means being disposed in generally contiguous relation with said shroud means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromechanical Clocks (AREA)
  • Transmission Devices (AREA)
  • Electromagnets (AREA)
US122942A 1970-03-17 1971-03-10 Device for the magnetic arresting of a switch wheel of a timekeeping device Expired - Lifetime US3673792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7009864U DE7009864U (de) 1970-03-17 1970-03-17 Vorrichtung zum magnetischen arretieren eines schaltrades eines zeithaltenden geraetes.

Publications (1)

Publication Number Publication Date
US3673792A true US3673792A (en) 1972-07-04

Family

ID=6610249

Family Applications (1)

Application Number Title Priority Date Filing Date
US122942A Expired - Lifetime US3673792A (en) 1970-03-17 1971-03-10 Device for the magnetic arresting of a switch wheel of a timekeeping device

Country Status (7)

Country Link
US (1) US3673792A (de)
JP (1) JPS4926914B1 (de)
AT (1) AT313180B (de)
CH (2) CH566035A (de)
DE (1) DE7009864U (de)
FR (1) FR2083352B3 (de)
GB (1) GB1306763A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50152066U (de) * 1974-06-03 1975-12-17
US20090154298A1 (en) * 2005-10-25 2009-06-18 Fromanteel Limited Clock
US20160357149A1 (en) * 2013-12-23 2016-12-08 Nivarox-Far S.A Optimised escapement with security means
US20160370766A1 (en) * 2013-12-23 2016-12-22 Eta Sa Manufacture Horlogere Suisse Mechanical clock movement with magnetic escapement
EP3627242A1 (de) * 2018-09-19 2020-03-25 The Swatch Group Research and Development Ltd Optimierter magnet-mechanischer uhrhemmungsmechanismus
CN112147873A (zh) * 2019-06-26 2020-12-29 斯沃奇集团研究和开发有限公司 具有对外部磁场不敏感的磁相互作用装置的钟表谐振器的惯性移动部件
US20210294270A1 (en) * 2020-03-18 2021-09-23 The Swatch Group Research And Development Ltd Horological movement comprising an escapement equipped with a magnetic system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006030793A1 (de) * 2006-06-30 2008-01-03 Zf Friedrichshafen Ag Schalteinrichtung für ein Schaltgetriebe

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50152066U (de) * 1974-06-03 1975-12-17
US20090154298A1 (en) * 2005-10-25 2009-06-18 Fromanteel Limited Clock
US8218400B2 (en) 2005-10-25 2012-07-10 Fromanteel Limited Clock
US9804570B2 (en) * 2013-12-23 2017-10-31 Eta Sa Manufacture Horlogere Suisse Mechanical clock movement with magnetic escapement
US20160370766A1 (en) * 2013-12-23 2016-12-22 Eta Sa Manufacture Horlogere Suisse Mechanical clock movement with magnetic escapement
US9665067B2 (en) * 2013-12-23 2017-05-30 Nivarox-Far S.A. Optimised escapement with security means
US20160357149A1 (en) * 2013-12-23 2016-12-08 Nivarox-Far S.A Optimised escapement with security means
EP3627242A1 (de) * 2018-09-19 2020-03-25 The Swatch Group Research and Development Ltd Optimierter magnet-mechanischer uhrhemmungsmechanismus
US11567456B2 (en) 2018-09-19 2023-01-31 The Swatch Group Research And Development Ltd Optimised magneto-mechanical timepiece escapement mechanism
CN112147873A (zh) * 2019-06-26 2020-12-29 斯沃奇集团研究和开发有限公司 具有对外部磁场不敏感的磁相互作用装置的钟表谐振器的惯性移动部件
CN112147872A (zh) * 2019-06-26 2020-12-29 斯沃奇集团研究和开发有限公司 具有对外部磁场不敏感的磁相互作用装置的钟表谐振器的惯性移动部件
US11644797B2 (en) 2019-06-26 2023-05-09 The Swatch Group Research And Develonment Ltd Inertia mobile component for horological resonator with magnetic interaction device insensitive to the external magnetic field
US20210294270A1 (en) * 2020-03-18 2021-09-23 The Swatch Group Research And Development Ltd Horological movement comprising an escapement equipped with a magnetic system
US11886146B2 (en) * 2020-03-18 2024-01-30 The Swatch Group Research And Development Ltd Horological movement comprising an escapement equipped with a magnetic system

Also Published As

Publication number Publication date
AT313180B (de) 1974-02-11
JPS4926914B1 (de) 1974-07-12
GB1306763A (en) 1973-02-14
CH326871A4 (de) 1973-05-30
DE7009864U (de) 1970-11-26
FR2083352A3 (de) 1971-12-17
CH566035A (de) 1975-08-29
FR2083352B3 (de) 1973-12-28

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