US3857236A - Positioning arrangement for a rotating part in a timepiece - Google Patents

Positioning arrangement for a rotating part in a timepiece Download PDF

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Publication number
US3857236A
US3857236A US00486106A US48610674A US3857236A US 3857236 A US3857236 A US 3857236A US 00486106 A US00486106 A US 00486106A US 48610674 A US48610674 A US 48610674A US 3857236 A US3857236 A US 3857236A
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US
United States
Prior art keywords
toothing
arbor
positioning arrangement
chronograph
rotating part
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
US00486106A
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English (en)
Inventor
H Burki
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.)
Nouvelle Lemania SA
Original Assignee
SSIH Management Services SA
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 SSIH Management Services SA filed Critical SSIH Management Services SA
Application granted granted Critical
Publication of US3857236A publication Critical patent/US3857236A/en
Assigned to NOUVELLE LEMANIA S.A. reassignment NOUVELLE LEMANIA S.A. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SOCIETE SUISSE POUR L'INDUSTRIE HORLOGERE MANAGEMENT SERVICES S.A.
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
    • G04B35/00—Adjusting the gear train, e.g. the backlash of the arbors, depth of meshing of the gears

Definitions

  • a further object of the invention' is to provide an arrangement which performs not only the function of eliminating play between the toothings, but also an additional function.
  • the'rotating part pivots with play in at least one bearing and comprises a shoulder against which a resilient element presses continuously, exerting upon the rotating part a force having an axial component and a horizontal component, the horizontal component being directed towards the axis of the driving toothing.
  • FIG. 1 is an axial sectional view
  • FIG. 2 is a top plan view.
  • the drawing shows an arbor l which is mounted in the center of a-chronograph movement and which bearsat one end a chronograph-hand 2 and at the other end a pivot 3 engaged in a bearing 4 integral with a bridge 5.
  • the arbor 1 pivots in the bore of a cannon-pinion 6, which in turn pivots in a central opening in a base plate 7 ofthe movement.
  • the pipe of the cannon-pinion 6 is also guided in rotation by means not shown.
  • a collar 8 of the arbor l ensures the pivoting of the arbor 1 in the bore of the cannon-pinion 6 near the end of the cannon-pinion 6 bearing a minute-hand 9.
  • the arbor l bears a return-tozero heart-piece l0, and between the heart-piece l and the pivot 3, it comprises a pinion-toothing 11 which is engaged with a driving wheel 12.
  • the wheel 12 forms part of a clutch (not shown), so that it is alter- 2 nately immobilized or driven at a speed such that the arbor 1 rotates at the rate of one revolution per minute. Therefore, in order for the hand 2 to give accurate indications, it is necessary to eliminate all play between the toothing of the pinion I1 and the wheel 12. This result is obtained, first of all, by a particular design of the toothings of these two elements.
  • the shapes of the teeth will be such that the points of the teeth of one of the toothings come to rest against the bottoms of the tooth-gaps of the other toothing.
  • One of the toothingsin the present case, that of the pinion- may be a normal involute toothing, for example. with the bottoms of the tooth-gaps being determined by arcs of a circle centered on the axis of the arbor l.
  • the points of the teeth of the wheel 12 on the other hand, will be slightly rounded, so that upon meshing, the points of the teeth of the wheel 12 come in contact with the tooth-gaps of the pinion 11.
  • the arbor 1 has a frustoconical shoulder 13 between the toothed portion of the pinion 11 and the portion of the arbor immediately adjacent thereto.
  • a spring 14 consisting of a straight wire borne by a pillar 15 set upright in the base plate 7.
  • the position and height of this pillar are such that the spring-wire I4 is held in an arched position both in a plane passing through the axis of the arbor l and in a plane perpendicular to that axis.
  • the spring-wire '14 therefore exerts an oblique force, acting in the direction indicated by an arrow F, upon the arbor l.
  • the spring 14 has a number of functions. First of all, it is a source of friction on the arbor 1.
  • the hole 16 of the bearing 4 is given a non-circular shape, slightly elongated in the direction determined by the parallel axes of the arbor l and the toothing of the wheel 12.
  • the shape of the hole 16 may be seen in FIG. 2.
  • the spring 14 exerts upon the arbor l a force of which the horizontal component acts in that direction and which consequently tends top'ress the piniontoothing 11 against the toothing of the wheel 12.
  • the profiles of these toothings will be such that the points of the teeth of the toothing of the wheel 12 press against the bottoms of the tooth-gaps of the toothing of the pinion 11 without the upper pivot of the arbor I pressing against the flank of the hole 16 of the bearing 4.
  • the length of this hole will be such that the short-side nearest the driving wheel 12 is never in contact with the upper pivot of the chronograph-arbor 1, while the opposite short-side offers sufficient play to absorb any eccentricity of the pinion 11 and the wheel 12, but little enough play to furnish support for the pivot of the chronograph-pinion l1 and thus to prevent disengagement of the toothings when the chronograph-pinion 11 is returned to zero.
  • This function of the spring 14 therefore ensures that the chronograph-hand will start up'without any jerk, besides avoiding any risk of jamming due to possible eccentricity of'the toothing of the wheel 12.
  • a positioning arrangement for a rotating part in a timepiece having a toothing engaged with a driving toothing wherein said rotating part pivots with play in at least one bearing and comprises a shoulder against which a resilient element presses continuously, exerting upon said rotating part a force having an axial component and a horizontal component, said horizontal component being directed towards the axis of said driving toothing.
  • chronograph-arbor comprises a pinion-toothing constantly engaged with said driving toothing, said shoulder being disposed between said pinion-toothing and the adjacent portion of said chronograph-arbor and being trustoconical in shape.
  • chronograph-arbor comprises a pivot in the vicinity of said pinion-toothing and said pivot is engaged in an elongated opening in a bearing element, the longitudinal axis of said opening being di rected towards the axis of said driving toothing.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Unknown Time Intervals (AREA)
US00486106A 1973-07-10 1974-07-05 Positioning arrangement for a rotating part in a timepiece Expired - Lifetime US3857236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1003573A CH580301B5 (cs) 1973-07-10 1973-07-10

Publications (1)

Publication Number Publication Date
US3857236A true US3857236A (en) 1974-12-31

Family

ID=4358630

Family Applications (1)

Application Number Title Priority Date Filing Date
US00486106A Expired - Lifetime US3857236A (en) 1973-07-10 1974-07-05 Positioning arrangement for a rotating part in a timepiece

Country Status (3)

Country Link
US (1) US3857236A (cs)
CH (2) CH1003573A4 (cs)
GB (1) GB1467473A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104914704A (zh) * 2014-03-14 2015-09-16 精工电子有限公司 轮系机构、机芯和钟表

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH709154A1 (fr) * 2014-01-16 2015-07-31 Richemont Int Sa Mouvement et pièce d'horlogerie mécanique comprenant un mécanisme de chronographe.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH226488A (fr) * 1939-02-24 1943-04-15 Manuf Des Montres Et Chronogra Mécanisme de seconde au centre.
CH278651A (fr) * 1949-05-18 1951-10-31 Schild Sa A Montre à seconde sautante.
CH306105A (fr) * 1953-02-17 1955-03-31 Omega Brandt & Freres Sa Louis Dispositif de fixation d'une roue d'un mouvement d'horlogerie sur l'extrémité d'un arbre.
CH332538A (fr) * 1956-08-31 1958-09-15 Morf Ernest Mécanisme d'entraînement de l'aiguille des minutes d'une pièce d'horlogerie sans roue de grande moyenne au centre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH226488A (fr) * 1939-02-24 1943-04-15 Manuf Des Montres Et Chronogra Mécanisme de seconde au centre.
CH278651A (fr) * 1949-05-18 1951-10-31 Schild Sa A Montre à seconde sautante.
CH306105A (fr) * 1953-02-17 1955-03-31 Omega Brandt & Freres Sa Louis Dispositif de fixation d'une roue d'un mouvement d'horlogerie sur l'extrémité d'un arbre.
CH332538A (fr) * 1956-08-31 1958-09-15 Morf Ernest Mécanisme d'entraînement de l'aiguille des minutes d'une pièce d'horlogerie sans roue de grande moyenne au centre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104914704A (zh) * 2014-03-14 2015-09-16 精工电子有限公司 轮系机构、机芯和钟表
JP2015175718A (ja) * 2014-03-14 2015-10-05 セイコーインスツル株式会社 輪列機構、ムーブメント及び時計
CN104914704B (zh) * 2014-03-14 2018-12-07 精工电子有限公司 轮系机构、机芯和钟表

Also Published As

Publication number Publication date
GB1467473A (en) 1977-03-16
CH580301B5 (cs) 1976-09-30
CH1003573A4 (cs) 1976-04-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: NOUVELLE LEMANIA S.A. MANUFACTURE D HORLOGERIE 2,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SOCIETE SUISSE POUR L INDUSTRIE HORLOGERE MANAGEMENT SERVICES S.A.;REEL/FRAME:003927/0832

Effective date: 19811104