US3626691A - Watch balance - Google Patents

Watch balance Download PDF

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Publication number
US3626691A
US3626691A US852559A US3626691DA US3626691A US 3626691 A US3626691 A US 3626691A US 852559 A US852559 A US 852559A US 3626691D A US3626691D A US 3626691DA US 3626691 A US3626691 A US 3626691A
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US
United States
Prior art keywords
inertia
balance
blocks
amplitude
watch
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
US852559A
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English (en)
Inventor
Francois Bonsack
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.)
Les Fabriques dAssortiments Reunies SA FAR
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Les Fabriques dAssortiments Reunies SA FAR
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Application filed by Les Fabriques dAssortiments Reunies SA FAR filed Critical Les Fabriques dAssortiments Reunies SA FAR
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Expired - Lifetime legal-status Critical Current

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    • 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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/06—Oscillators with hairsprings, e.g. balance
    • G04B17/063—Balance construction

Definitions

  • a watch balance comprising at least two inertia-blocks having a streamlined shape carried by arms and extending on the Whole over less than the half of the circumference of the balance, the rest of the circumference being free of material, characterized in that the compactness of the inertia-blocks in the range of from .310i to .4155 and the material comprising the inertia-blocks a density exceeding 9 g./cm.3.
  • the present invention relates to a watch balance.
  • non-sustained oscillator in orderthatits amplitude falls to 1/ e of its initial value, e being the basis of the natural logarithms,
  • e being the basis of the natural logarithms
  • any reduction of the consumption of energy for a given moment of inertia will enable the engineer to choose, for a given available power and a given frequency, balances of larger moment of inertia, and this will enhance orfavor the factor of quality Q.
  • the present invention aims at reducing the factor (a), i.e. the friction of the balance against air,
  • the engineer seeks, therefore, to obtain an oscillator the consumption of which is as low as possible, but which does not show a too large fall of amplitude when the available power diminishes by a given percentage.
  • FIG. 1 is a graph depicting dissipated power P as a function of amplitude rp for an oscillating system of the type treated by the invention
  • FIG. 2 is a graph depicting the derivative dP/dq; as a function of (p where P and p are the same parameters as in IFIG. l;
  • FIG. 3 is a top View of an embodiment of the invention.
  • FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3;
  • FIGS. 5, 6 and 7 are, respectively, plan views of further embodiments of the invention.
  • the ordinate dP/d at the point of abscissa (p0 may be divided into three segments:
  • the surface P0 may be divided into three portions:
  • P (00) Pa ⁇ -Pb ⁇ -Pc constant. It is, therefore, only possible to carry out transfers between the Pa', Pb and Pc (for instance subtract a certain quantity AP from Pa and distribute it over Pb and Pc).
  • c socalled quadratic coefficient of friction, proportional to S and to Rm3.
  • a first method is to increase the density of the material used for the rim.
  • the rim area is reduced, so that Pb and Pc are diminished; then, the radius has to be increased in order to restore P p0); since Pc increases more quickly with the radius than Pb', it is possible to obtain all things considered a diminution of Pb at the expense of Pc.
  • the engineer is, therefore, induced to wonder whether it would not be advantageous to abandon the conti-nuous rim and to distribute the mass of inertia into separate portions, this introducing, I admit, front frictions (which may again be reduced by using stream-lined shapes), but permitting obtaining a larger compactness and, therefore, a smaller area for a given volume.
  • the calculation and the experience have confirmed this supposition:
  • the introduction of a front friction is largely compensated by the diminution of the side friction consecutive to the diminution of the area. And this is precisely the subject-matter of the present invention.
  • the invention proposes a balance having separate masses, preferably presenting a stream-lined profile, carried lby arms. For reasons of equilibrium, at least two symmetrical masses are required.
  • the engineer is even induced Definition of the Compactness The following quantity is defined as a measure for the Compactness:
  • V volume of the body
  • S area of the body
  • This measure offers the advantage that it depends only upon the shape, and not upon the size (y is invariant if al1 of the linear dimensions of a body are multiplied by the same factor).
  • the present invention relates to a watch balance, consisting of at least two inertia-blocks or weights carried by arms and extending on the whole over less than the half of the circumference of the balance, the rest of the circumference being free of material, this balance being characterized in that the Compactness of the inertiablocks is greater than .310, and is preferably greater than .320.
  • the Compactness referred to as the Compactness of the mass of inertia alone (inertia-blocks and possible balancing screws), the arms adapted to sustain this mass of inertia not included. If the inertia-blocks are pieces .manufactured separately from the arms, the arm portion situated outside the inner radius of the inertia-block is considered as belonging to the mass of inertia.
  • the balance illustrated in FIGS. 3 and 4 includes two identical interia-blocks or weights 1 and 2 carriedv by arms 3 and 4, respectively.
  • Each of the inertia-blocks presents two pyramid-shaped ends 5, in order to reduce the front frictions on the oscillation of the balance.
  • the width of the arms 3 and 4 is fairly larger than their thickness.
  • Both inertia-blocks 1 and 2 extend on the whole over less than the half of the circumference of the balance, the rest of the circumference being free of material. In the example illustrated, the Compactness of the inertia-blocks is about .35.
  • the density of the inertiablocks 1 and 2 is preferably rather large; it may for instance exceed 9 g./cm.3.
  • the number of the inertiablocks might be greater than two and may include three or more arms 3a, 4a and 6, carrying weights 1a, 2a and 7 respectively, as shown in FIG. 7.
  • a watch balance consisting of at least two inertiablocks carried by arms and extending on the whole over less than the half of the circumference of the balance, the rest of the circumference being free of material, characterized in that the Compactness of the inertia-blocks is in the range of from .310 to .455, the material comprising said blocks having a density exceeding 9 g./cm.3, and said inertia-blocks having a streamlined shape which converges symmetrically toward the opposite ends thereof,

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Vibration Prevention Devices (AREA)
  • Electromechanical Clocks (AREA)
US852559A 1968-09-06 1969-08-25 Watch balance Expired - Lifetime US3626691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1344468A CH519741A (fr) 1968-09-06 1968-09-06 Balancier de montre

Publications (1)

Publication Number Publication Date
US3626691A true US3626691A (en) 1971-12-14

Family

ID=4392513

Family Applications (1)

Application Number Title Priority Date Filing Date
US852559A Expired - Lifetime US3626691A (en) 1968-09-06 1969-08-25 Watch balance

Country Status (4)

Country Link
US (1) US3626691A (fr)
CH (2) CH519741A (fr)
DE (1) DE1943197A1 (fr)
FR (1) FR2017510A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851461A (en) * 1971-02-10 1974-12-03 Timex Corp Balance wheel
DE2457551A1 (de) * 1973-12-27 1975-07-10 Ibm Josephson-schaltkreis mit symmetrisierter uebertragungsleitung
USRE28794E (en) * 1972-12-22 1976-05-04 Timex Corporation Balance wheel
US5163535A (en) * 1991-05-13 1992-11-17 Jolie Thomas J Timing mechanism
US20060126444A1 (en) * 2000-08-01 2006-06-15 Brenda Ellner Watch for dispensing scents, vapor and/or droplets, and storage device
US20070201317A1 (en) * 2004-10-26 2007-08-30 Tag Heuer Sa Regulating element for wristwatch and mechanical movement comprising one such regulating element
US9016933B2 (en) 2011-07-29 2015-04-28 Rolex S.A. Balance wheel assembly with optimized pivoting
EP3182215A1 (fr) * 2015-12-14 2017-06-21 Novasort SA Systeme oscillateur pour montre
US20180004164A1 (en) * 2014-12-18 2018-01-04 Marc André JEANNERET Oscillator for timepiece movement

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3851461A (en) * 1971-02-10 1974-12-03 Timex Corp Balance wheel
USRE28794E (en) * 1972-12-22 1976-05-04 Timex Corporation Balance wheel
DE2457551A1 (de) * 1973-12-27 1975-07-10 Ibm Josephson-schaltkreis mit symmetrisierter uebertragungsleitung
US5163535A (en) * 1991-05-13 1992-11-17 Jolie Thomas J Timing mechanism
US20060126444A1 (en) * 2000-08-01 2006-06-15 Brenda Ellner Watch for dispensing scents, vapor and/or droplets, and storage device
US7396154B2 (en) * 2004-10-26 2008-07-08 Tag Heuer Sa Regulating element for wristwatch and mechanical movement comprising one such regulating element
US20070201317A1 (en) * 2004-10-26 2007-08-30 Tag Heuer Sa Regulating element for wristwatch and mechanical movement comprising one such regulating element
US9016933B2 (en) 2011-07-29 2015-04-28 Rolex S.A. Balance wheel assembly with optimized pivoting
US20180004164A1 (en) * 2014-12-18 2018-01-04 Marc André JEANNERET Oscillator for timepiece movement
US10133240B2 (en) * 2014-12-18 2018-11-20 Marc André JEANNERET Oscillator for timepiece movement
EP3182215A1 (fr) * 2015-12-14 2017-06-21 Novasort SA Systeme oscillateur pour montre
WO2017102845A1 (fr) * 2015-12-14 2017-06-22 Novasort Sa Système oscillant pour montre
US11415941B2 (en) 2015-12-14 2022-08-16 Wcp (Watch Connaisseur Project) Sa Oscillating system for a watch

Also Published As

Publication number Publication date
DE1943197A1 (de) 1970-04-02
FR2017510A1 (fr) 1970-05-22
CH1344468A4 (fr) 1971-10-29
CH519741A (fr) 1971-10-29

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