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US3579975A - Flexure-type symmetrical oscillator - Google Patents

Flexure-type symmetrical oscillator Download PDF

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Publication number
US3579975A
US3579975A US852811A US3579975DA US3579975A US 3579975 A US3579975 A US 3579975A US 852811 A US852811 A US 852811A US 3579975D A US3579975D A US 3579975DA US 3579975 A US3579975 A US 3579975A
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US
United States
Prior art keywords
oscillator
gravity
center
frequency
limbs
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
US852811A
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English (en)
Inventor
Rene Besson
Remy Chopard
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.)
Ebauches SA
Original Assignee
Ebauches 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
Priority claimed from CH1311268A external-priority patent/CH502621A/fr
Application filed by Ebauches SA filed Critical Ebauches SA
Application granted granted Critical
Publication of US3579975A publication Critical patent/US3579975A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • G04C3/101—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means constructional details
    • G04C3/107—Controlling frequency or amplitude of the oscillating system

Definitions

  • Elavin ABSTRACT A flexure-type symmetrical oscillator for an electric timepiece, having a U-shaped part with two flexible limbs connected at their free ends to two rigid arms which in turn have counterbalancing masses at their free ends and drive transducers at the location where they are connected to the flexible limbs, the dimensioning of the arms and limbs being such that the instantaneous center of rotation thereof is substantially coincident with the center of gravity during flexure, whereby the frequency of the oscillator is substantially independent of changes of position and orientation of the oscillator with respect to gravity, means being provided which permits adjustment of the frequency of the oscillations of such an oscillator, like the regulator assembly of a conventional watch with balance-wheel and balance-spring, in view of the adjustments of the running of the watch.
  • the present invention relates to a flexure-type symmetrical oscillator, particularly for an electric timepiece.
  • the oscillator according to the invention comprises a U- shaped part having two flexible limbs adapted toparticipate in flexure in the fashion of a tuning fork, and two rigid arms serving as counterbalances for the flexible limbs during flexure, one such rigid arm being connected to each of the flexible limbs at or adjacent the free end of the latter, the arrangement being such that, for each of the two symmetrical parts of said oscillator, the instantaneous center of rotation thereof is substantially coincident with the center of gravity thereof during flexure, whereby the frequency of the oscillator is substantially independent of changes of position and orientation of such oscillator with respect to the field of gravity, at least one of the said two rigid arms carrying, situated in the neighborhood ofits free extremity, an inertia-block fitted'thereon so as to be able to occupy several angular positions around an axis which does not coincide with its center of gravity, the whole in such a way that displacing this inertia-block about the said axis
  • FIG. 1 is a plan view of a symmetrical oscillator of flexure type for a timepiece.
  • FIG. 2 is a plan view of a detail of FIG. 1, at scale, and
  • FIG. 3 is a sectional view along line IIIllI of FIG. 2.
  • Each enlarged part 4a carries a counterweight 5 constituted by a washer forced on a trunnion 6 forced in the part 4a.
  • One of the parts 40 carries, fixed thereon at 7, a pawl 8 actuating a ratchet counting-wheel 9 forming the first element of the driving gear-train of the hands of the timepiece.
  • Each trunnion 6 carries, frictionally fitted thereon and retained by a head 60 of the trunnion, a regulating inertiablock formed by a three branch star-shaped piece 10.
  • One of the branches of each star-shaped piece 10 is provided with a notch 11 producing an asymmetry of the piece 10 such that the center of gravity of the inertia-block does not coincide with its geometrical axis.
  • each inertia-block 10 has an index 12 situated opposite a graduation 13 which is carried by the terminal part 4a of the corresponding rigid arm 4, in a manner so that the displacements of the inertia-blocks can be controlled in a precise manner.
  • These displacements will preferably be carried out by means of a three-finger tool engaged between the branches of the inertia-blocks.
  • the frequency of the oscillations should be the same for the two limbs of the oscillator, so that no energy-consuming reaction occurs on the support.
  • the corrections of frequency realized by means of the inertia-blocks permit to adjust the running of the watch even when these corrections are extremely small, so that they do not produce, between the two limbs of the oscillator, even if they are applied thereon in an unequal manner, a difference of frequency which is perceptible. This greatly facilitates the adjusting operations; the oscillator may, if necessary, even comprise only a single inertiablock fitted on one of its rigid arms.
  • a flexutre-type symmetrical oscillator for an electric timepiece comprising: a U-shaped part including two flexible limbs adapted to flex in the fashion of atuning fork, two rigid arms serving as counterbalances for the flexible limbs, the rigid arms being connected to respective flexible limbs adjacent the free ends of the latter and projecting therefrom parallel to the limbs along the complete length thereof and beyond the closed end of the U-shpaed part to form arm and limb units in a symmetrical arrangement, each arm and limb unit having an instantaneous center of rotation during flexure and being dimensioned to define a center of gravity substantially coincident with the instantaneous center of rotation whereby the frequency of the oscillator is substantially independent of changes of position and orientation of the oscillator with respect to the field of gravity, at least one of the two rigid arms mounting in the area of its free extremity an inertiablock fitted for occupying a plurality of angular positions around an axis out of coincidence with its
  • the oscillator as claimed in claim 1 the washer being constituted by a three branch star-shaped member in one branch of which is provided the recess.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Electromechanical Clocks (AREA)
US852811A 1968-08-30 1969-08-25 Flexure-type symmetrical oscillator Expired - Lifetime US3579975A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1311268A CH502621A (fr) 1965-05-28 1968-08-30 Oscillateur symétrique à flexion pour pièce d'horlogerie

Publications (1)

Publication Number Publication Date
US3579975A true US3579975A (en) 1971-05-25

Family

ID=4389432

Family Applications (1)

Application Number Title Priority Date Filing Date
US852811A Expired - Lifetime US3579975A (en) 1968-08-30 1969-08-25 Flexure-type symmetrical oscillator

Country Status (5)

Country Link
US (1) US3579975A (de)
CH (1) CH1311268A4 (de)
DE (1) DE1943982A1 (de)
FR (1) FR2016653B2 (de)
GB (1) GB1262175A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795831A (en) * 1969-10-03 1974-03-05 Suwa Seikosha Kk Miniature tuning fork type crystal vibrator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA744511A (en) * 1966-10-18 Hetzel Max Electronic watch
CH451021A (fr) * 1965-05-28 1968-05-15 Ebauches Sa Oscillateur symétrique à flexion pour pièce d'horlogerie

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA744511A (en) * 1966-10-18 Hetzel Max Electronic watch
CH451021A (fr) * 1965-05-28 1968-05-15 Ebauches Sa Oscillateur symétrique à flexion pour pièce d'horlogerie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795831A (en) * 1969-10-03 1974-03-05 Suwa Seikosha Kk Miniature tuning fork type crystal vibrator

Also Published As

Publication number Publication date
GB1262175A (en) 1972-02-02
DE1943982A1 (de) 1970-05-27
CH1311268A4 (de) 1970-09-30
FR2016653A2 (de) 1970-05-08
FR2016653B2 (de) 1975-11-07

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