US3695032A - Isochronal correction system - Google Patents

Isochronal correction system Download PDF

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Publication number
US3695032A
US3695032A US150586A US3695032DA US3695032A US 3695032 A US3695032 A US 3695032A US 150586 A US150586 A US 150586A US 3695032D A US3695032D A US 3695032DA US 3695032 A US3695032 A US 3695032A
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United States
Prior art keywords
balance wheel
rim
isochronal
unbalance
correction
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Expired - Lifetime
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US150586A
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English (en)
Inventor
Robert R Lawson
Leonard L Metzinger
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Bunker Ramo Corp
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Bunker Ramo Corp
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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
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • G04B17/28—Compensation of mechanisms for stabilising frequency for the effect of imbalance of the weights, e.g. tourbillon
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
    • G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
    • G04D7/1257—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present
    • G04D7/1271—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for the control mechanism only (from outside the clockwork)
    • G04D7/1292—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for the control mechanism only (from outside the clockwork) whereby the adjustment device works on the balance wheel

Definitions

  • FIG. 1 is a schematic illustration of a hairspring and balance wheel mounting for a mechanical clock
  • An important object of the present invention is to overcome the foregoing and other'disadvantages, defects, inefficiencies, shortcomings and problems in prior methods and structures and to attain important advantages and improvements by providing the novel isochronal correction system which will be hereinafter more particularly described.
  • Another object of the invention is to provide a system for isochronal correction of clockworks which will enable the works to be manufactured according to a standard isochronally corrected for one preferred gravitational orientation of the works in service and enabling selective additional isochronal correction to accommodate wide rotary variants from the predetermined gravity orientation to accommodate environmental conditions such as accessibility of the clocksetting stem, without necessitating rebuilding of any part of the clockworks.
  • Another object of the invention is to provide for selective isochronal correction of mechanical clockworks through simple and easily effected location of counterbalancing means on the balance wheel.
  • FIG. 2 is a similar schematic illustration demonstrating isochronal correction according to the principles of the present invention
  • FIG. 3 is a chart illustrating performance characteristics that are the basis of the isochronal correction system.
  • FIG. 4 is an enlarged fragmentary sectional detail view taken substantially along the line IV-IV of FIG. 2.
  • FIG. 1 is depicted a typical balance and hairspring assembly as used in a mechanical clock such as an automotive vehicle clock.
  • a balance wheel 5 is mounted in fixed corotatable relation on an oscillating staff 7.
  • a so-called flat helical hairspring 8 is anchored fixedly on its outer end to a stationary stud 9 fixed to a portion of the clockwork such as a frame plate 10.
  • the hairspring 8 is anchored to a collet 11 which is fixed corotatively on the staff 7, the collet having been statically balanced by virtue of its shape. Static balancing of the balance wheel 5 is effected while assembled on the staff 7.
  • safety roller 12 and impulse pin 13 are assembled with respectively the shaft or staff 7 and the hub portion of the balance wheel.
  • means are provided for regulating the hairspring/balance combination after assembly into the clock movement or after any weight change is made on the balance wheel, herein comprising a movable regulator 14.
  • isochronal correction is generally effected by as nearly as practicable balancing two rate change characteristics, with opposite signs, to achieve a more constant rate throughout the possible range of balance motion in the timepiece.
  • a curve 15 demonstrates the rate of change with balance motion that would be caused by the hairspring if the balancewheel 5, the staff 7, roller 12 and impulse pin 13 where statically balanced as a unit.
  • curve 17 shows the rate change tendency that is produced by a design unbalance of the balance wheel, here occasioned by roller 12 and impulse pin 13 which are dimensioned so that an unbalance is created in the direction and amount indicated by the vector arrow 18 (FIG.
  • a setting stem is provided. It is desirable to have standard works, but at the same time it is necessary to provide for positioning the stem at varying positions to conform to styling variations from automobile to automobile. I-Ieretofore, when it has been necessary to mount the clockwork such that there is an intolerable angular deviation from the normal gravity oriented vertical downward location of the vector 18, for the reasons such as gaining access to the time-setting stem (not shown) of the associated clock, it has been the practice to realign the balances and counterbalances in the assembly to effect proper shift of the vector 18 to the normal vertical, gravity oriented relation, or to add a gear train to effectively move the stem. Either of these solutions is a costly manufacturing procedure which substantially increases unit costs.
  • means are provided which eliminate need for additional gear parts or structurally or relatively changing or rebalancing the parts ofthe assembly, while nevertheless attaining the desired isochronal correction resulting in the close-toflat curve performance demonstrated by the curve 19 in FIG. 3, while enabling any preferred rotary positioning or orientation for the mounting of the clockwork about a horizontal axis represented by the staff 7.
  • counterbalancing weight adjustment is effected on the rim, represented as a flat band 21 of the balance wheel 5.
  • the balance wheel unbalance vector 18 must be shifted 90 from the normal vertical position into substantially the horizontal position shown in FIG. 2.
  • An added unbalancing weight factor is added to the rim 21 on a vector 22 located on a line divergent relative to the line of the vector 18 at the opposite side of a vertical line such that the initial unbalance and the adjustment unbalance weight relationships represented by the vectors 18 and 22 will result in a vector 23, in the reoriented works of FIG. 2, equal to the original vector 18 as demonstrated in FIG. 1.
  • the second unbalance in the balance wheel represented by the vector 22, may be accomplished by clipping or punching material, indicated at 24, from the rim 21 diametrically opposite to the point at which the line of the vector 22 intersects the rim 21, thereby throwing the intersected area of the rim out of balance at that point.
  • the preferred manner of attaining the second unbalance to attain the vector 22 is to apply to the prescribed area of the rim 21, which is to have the second unbalance, a weight 25 of the proper value.
  • a weight 25 may be a metal disk calculated at attain the desired results with the particular size and performance requirement of the balance wheel 5 and its associated operating parts.
  • a suitable adhesive or other bonding agent 27 may be applied between the facing surfaces of the weight and rim.
  • the adhesive 27 may be of the pressure sensitive type commonly employed in attaching nameplates and the like to machinery.
  • Such adhesive is readily available on the market and has excellent, durable bonding characteristics between metal surfaces and is capable of withstanding wide temperature variations as well as other atmospheric variables, shocks and vibrations, and the like.
  • the preferred system of balance adjustment provides adjustment for 60 1 30, 120 1': 30 and 180 1 30 on the following basis:
  • the present invention provides a new system of isochronal correction having many advantages over prior methods.
  • One standardized clock movement as produced by mass production assembly line techniques is adapted in a simple manner to be mounted in any required rotary relation in the clock case with assurance of uniform performance, provided the compensatory unbalance factor is provided on the balance wheel, as taught herein, where the clock movement is mounted significantly out of phase with the normal vertical gravitational isochronal correction.
  • a significant hairspring tolerance is enabled, thus providing manufacturing economy at this point. Further economy is attained by the avoidance of any need for special gears or settings for regulating trains where a standardized orientation of the clockwork is installed but the setting stem must be located at a different-from-normal position.
  • the only variation in manufacturing sequences from the normal assembly procedures to equip the balance wheel with the desired rotary adjustment counterbalancing resides in assembling a prealtered balance wheel where the punched in balance 24 is to be used, or
  • a method of isochronal correction of a hairspring/balance wheel combination for a clockwork which has been isochronally corrected for vertical gravitational orientation by providing an original unbalance but which must be mounted substantially rotated from the orientation in which the original correction was made, comprising:
  • a method according to claim 1, comprising removing material from the balance wheel diametrically opposite to the point at which the compensatory unbalance is effected on the balance wheel rim.
  • a method according to claim 1, comprising applying a weight to provide the compensatory unbalance on 5.
  • a hairspring/balance wheel assembly for use in a clockwork and including a spiral hairspring having its outer end anchored to a stationary member and its inner end anchored to an oscillatable stafl on which is mounted corotatably a balance wheel having a rim and including means providing isochronal correction involving a vertical unbalance vector for the balance wheel in a normal vertical gravitational orientation of the assembly, but requiring mounting of the assembly with an associated clockwork rotatably out of phase with the normal gravitational orientation such that the isochronal correction is adversely altered, the improvement comprising:
  • unbalancing weight means on the balance wheel rim located at a point spaced angularly from said vertical unbalance vector to compensate for the rotary out-of-phase mounting and thereby restoring the isochronal correction for the assembly.
  • weight means comprise a punched-out area on the balance wheel rim diametrically opposite to the point on the rim at which the weight means are located.
  • said weight comprising a metal disk, and means securing the disk to the balance wheel rim.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)
US150586A 1971-06-07 1971-06-07 Isochronal correction system Expired - Lifetime US3695032A (en)

Applications Claiming Priority (1)

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US15058671A 1971-06-07 1971-06-07

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US3695032A true US3695032A (en) 1972-10-03

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US (1) US3695032A (https=)
CA (1) CA953932A (https=)
DE (1) DE2216413A1 (https=)
FR (1) FR2140378B1 (https=)
GB (1) GB1380767A (https=)
IT (1) IT950795B (https=)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6666575B2 (en) * 2002-03-21 2003-12-23 Chopard Manufacture Sa Balance wheel provided with an adjustment device
US20110044139A1 (en) * 2009-08-18 2011-02-24 Csem Centre Suisse D'electronique Et De Microtechnique Sa Recherche Et Developpement Isochronism corrector for clockwork escapement and escapement provided with such a corrector
USD635045S1 (en) * 2009-09-14 2011-03-29 Perrelet Sa Oscillating mass for a watch
USD640582S1 (en) * 2009-12-01 2011-06-28 Lvmh Swiss Manufactures S.A. Weight
US20150338829A1 (en) * 2012-06-26 2015-11-26 Rolex Sa Method for determining an imbalance characteristic of an oscillator
USD759527S1 (en) * 2013-10-16 2016-06-21 Swatch Ltd Oscillating weight
USD1012206S1 (en) * 2020-07-28 2024-01-23 Coulter Ventures, Llc. Weight plate
USD1057053S1 (en) 2021-06-29 2025-01-07 Coulter Ventures, Llc. Weight plate

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH336009A (de) * 1955-02-19 1959-01-31 Diehl Gmbh Verfahren zum Auswuchten von Uhren-Unruhen
DE1142796B (de) * 1957-05-08 1963-01-24 Hugo Hettich Verfahren und Einrichtung zum Grobabgleichen der Schwingungszahl von Unruhschwingsystemen
DE1164331B (de) * 1959-05-23 1964-02-27 Kienzle Uhrenfabriken Ag Auswuchtverfahren fuer Unruhen
CH375297A (de) * 1960-12-02 1964-03-31 Greiner Electronic Ag Verfahren zum Abgleich von für Uhrwerke bestimmten Schwingsystemen
DE1548097A1 (de) * 1966-03-21 1969-08-21 Kienzle Uhrenfabriken Gmbh Statisches Auswuchtverfahren

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH336009A (de) * 1955-02-19 1959-01-31 Diehl Gmbh Verfahren zum Auswuchten von Uhren-Unruhen
DE1142796B (de) * 1957-05-08 1963-01-24 Hugo Hettich Verfahren und Einrichtung zum Grobabgleichen der Schwingungszahl von Unruhschwingsystemen
DE1164331B (de) * 1959-05-23 1964-02-27 Kienzle Uhrenfabriken Ag Auswuchtverfahren fuer Unruhen
CH375297A (de) * 1960-12-02 1964-03-31 Greiner Electronic Ag Verfahren zum Abgleich von für Uhrwerke bestimmten Schwingsystemen
DE1548097A1 (de) * 1966-03-21 1969-08-21 Kienzle Uhrenfabriken Gmbh Statisches Auswuchtverfahren

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6666575B2 (en) * 2002-03-21 2003-12-23 Chopard Manufacture Sa Balance wheel provided with an adjustment device
US20110044139A1 (en) * 2009-08-18 2011-02-24 Csem Centre Suisse D'electronique Et De Microtechnique Sa Recherche Et Developpement Isochronism corrector for clockwork escapement and escapement provided with such a corrector
US8672536B2 (en) * 2009-08-18 2014-03-18 CSEM Central Suisse d'Electronique et de Microtechnique SA—Recherche et Development Isochronism corrector for clockwork escapement and escapement provided with such a corrector
USD635045S1 (en) * 2009-09-14 2011-03-29 Perrelet Sa Oscillating mass for a watch
USD640582S1 (en) * 2009-12-01 2011-06-28 Lvmh Swiss Manufactures S.A. Weight
US20150338829A1 (en) * 2012-06-26 2015-11-26 Rolex Sa Method for determining an imbalance characteristic of an oscillator
US10120341B2 (en) * 2012-06-26 2018-11-06 Rolex Sa Method for determining an imbalance characteristic of an oscillator
USD759527S1 (en) * 2013-10-16 2016-06-21 Swatch Ltd Oscillating weight
USD1012206S1 (en) * 2020-07-28 2024-01-23 Coulter Ventures, Llc. Weight plate
USD1027075S1 (en) * 2020-07-28 2024-05-14 Coulter Ventures, Llc. Weight plate
USD1080773S1 (en) 2020-07-28 2025-06-24 Coulter Ventures, Llc. Weight plate
USD1057053S1 (en) 2021-06-29 2025-01-07 Coulter Ventures, Llc. Weight plate

Also Published As

Publication number Publication date
FR2140378B1 (https=) 1976-06-11
DE2216413A1 (de) 1973-01-04
GB1380767A (en) 1975-01-15
FR2140378A1 (https=) 1973-01-19
IT950795B (it) 1973-06-20
CA953932A (en) 1974-09-03

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