US3236041A - Collet for fixing the inner end of a balance-spring of a timepiece - Google Patents

Collet for fixing the inner end of a balance-spring of a timepiece Download PDF

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Publication number
US3236041A
US3236041A US415275A US41527564A US3236041A US 3236041 A US3236041 A US 3236041A US 415275 A US415275 A US 415275A US 41527564 A US41527564 A US 41527564A US 3236041 A US3236041 A US 3236041A
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US
United States
Prior art keywords
cup
ring
balance
spring
collet
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
US415275A
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English (en)
Inventor
Marquis Amedee
Charpilloz Arnold
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CHARPILLOZ
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CHARPILLOZ
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 CHARPILLOZ filed Critical CHARPILLOZ
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Publication of US3236041A publication Critical patent/US3236041A/en
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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
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/32—Component parts or constructional details, e.g. collet, stud, virole or piton
    • G04B17/34—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring onto the balance
    • G04B17/345—Details of the spiral roll
    • 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
    • G04B18/00—Mechanisms for setting frequency
    • G04B18/04—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat
    • G04B18/06—Adjusting the beat of the pendulum, balance, or the like, e.g. putting into beat by setting the collet or the stud of a hairspring

Definitions

  • the present invention relates to a collet for fixing the inner end of a balance-spring of a timepiece.
  • This collet is characterized in that it comprises a cup and radially split ring, engaged in said cup, the cup having, from its bottom provided with a central hole, bores of increasing diameter and, in its side wall, at least a cut-out part extending over a portion of its height, the ring and the cup being arranged so as to form therebetween an annular chamber receiving a portion of the balance-spring, the inner bent end of which is hooked in the split of the ring, the ring having in addition a diametral groove in one of its faces, the diameters of said bores being such that the ring, when it is partially introduced into the cup, may be turned with an easy fit in the cup and that, when it is completely pushed, it is firmly held in position in the cup, while it may still be turned in order to adjust the active length of the balance-spring and the position of its point of attachment.
  • FIGURE 1 is a diametral cross-sectional view of the first embodiment along the line II of FIGURE 2.
  • FIGURE 2 is a top plan view of same.
  • FIGURE 3 is a cross-sectional view of the second embodiment along the line III-III of FIGURE 4.
  • FIGURE 4 is a top plan view of same.
  • the reference numeral 1 denotes the outer cup of the collet.
  • the cup 1 includes a bottom 2 provided with a central hole 3 and has three coaxial bores 4, 5 and 6 of increasing diameter.
  • the bore 4 has the shape of a circular groove which leaves a rib 7 between itself and the hole 3 of the bottom 2.
  • the bores 4, 5 and 6 are interconnected by surfaces inclined at 45.
  • the collet includes in addition an inner ring 10 adapted to cooperate with the cup 1.
  • the ring 10 consists of a cylindrical body provided at its ends with two collars 11 and 12 and has in its centre a hole 13.
  • the bottom corresponding to the collar 11 has a circular recess 14 the depth of which is slightly greater than the height of the rib 7 of the cup 1, the diameter of the recess 14 being slightly greater than the outer diameter of said rib 7.
  • the outer diameters of the collars 11 and 12 are chosen in such a manner that the ring 10 may be inserted with an easy fit into the upper portion of the cup 1, the collar 11 being in contact with the intermediate bore 5 of the cup 1.
  • the collars 11 and 12 have at their lower portion bevelled edges inclined at 45 corresponding to the abovementioned surfaces inclined at 45 interconnecting the bores 4, 5 and 6 of the cup 1.
  • the ring 10 is radially split as at 15, the split being somewhat wider than the thickness of the balance-spring used.
  • the ring 10 has in addition a diametral groove 16 provided in its top surface, said groove being adapted to receive a tool for turning the ring 10 within the cup 1.
  • the space lying between the collars 11 and 12 forms a groove which defines, with the wall 9 of the cup 1, an annular chamber 17 adapted to receive the inner portion of the balance-spring 18, as explained later.
  • the split ring 10 is partially introduced into the top portion of the cup 1, With the collar 11 engaging the bore 5, so that the split 15 faces one of the grooves 8.
  • the choice of either of the grooves 8 will depend on the direction of Winding of the balance-spring 18.
  • the bent end of the balance-spring 18 is placed in the split 15 and the groove 8 so that the balance-spring 18 is at the level of the groove lying between the collars 11 and 12.
  • the ring 10 is turned in the Winding direction of the balance-spring 18, i.e. in the counterclockwise direction in FIG. 2, up to the position illustrated in FIG.
  • the ring 10 is pushed completely into the cup 1, so that the collar 11 enters the bore 4 of the cup 1 and the collar 12 enters the bore 5; the diameters of the bores 4 and 5 are slightly smaller than the diameters of the corresponding collars, so that the ring 10 is radially contracted and is firmly held in position in the cup 1.
  • the ring 10 may still be turned by means of the above-mentioned tool. At this moment, the frequency of the oscillations of the sprung balance is compared with that of the oscillations of a calibrated reference sprung balance.
  • the ring 10 is turned in the one or the other direction, which permits to adjust, on the one hand,the active length of the balance-spring and, on the other hand, the position of its point of attachment.
  • the frequency of the oscillations is again checked until the sprung balance oscillates in synchronism with the reference sprung balance.
  • the second embodiment, illustrated in FIGS. 3 and 4 is somewhat simplified, but shows the same advantages as the first embodiment.
  • the cup 19 includes a bottom 20 provided with a central hole 21 and has three bores 22, 23 and 24 of increasing diameter.
  • the collet includes in addition an inner ring 27, adapted to cooperate with the cup 19.
  • the ring 27 consists of a cylindrical body provided at its top end with a collar 28 and has in its centre a hole 29.
  • the outer diameter of the cylindrical body of the ring 27 is chosen in such a manner that the ring 27 may be introduced with an easy fit into the upper portion of the cup 19, said cylindrical body being in contact with the intermediate bore 23 of the cup 19.
  • the ring 27 is radially split as at 30, the split being somewhat wider than the thickness of the balance-spring used.
  • the ring 27 has in addition a diametral groove 31 provided in its top surface, said groove being adapted to receive a tool for turning the ring 27 within the cup 19.
  • the collar 28 defines, with the wall of the cylindrical body of the cup 27, a shoulder 32 of the cup 19 and the wall 26 of the cup 19, an annular chamber 33 adapted to receive the inner portion of the balance-spring 34.
  • the fixing of the inner end of the balance-spring 34 to the collet described is substantially the same as for the first embodiment.
  • the ring 27 is partially introduced into the top portion of the cup 19, with the cylindrical body of the ring 27 engaging the bore 23, so that the split 30 faces the cut-out part 25.
  • the bent end of the balance-spring 34 is placed in the split 30 so that the balance-spring 34 is situated below the collar 28.
  • the ring 27 is turned in the winding direction of the balancespring 34, i.e. in the counter-clockwise direction in FIG. 4, up to the position illustrated in FIG. 4, for instance.
  • the ring 27 is pushed completely into the cup 19, so that the cylindrical body of the cup 27 enters the bore 22 of the cup 19 and the collar 28 enters the bore 24; the diameters of the bores 22 and 24 are slightly smaller than the diameters of the cylindrical body of the ring 27 and of the collar 28, respectively, so that the ring 27 is radially contracted and is firmly held in position in the cup 19.
  • the ring 27 may still be turned by means of the above-mentioned tool. At this moment, the frequency of the oscillations of the sprung balance is compared with that of the oscillations of a calibrated reference sprung balance. If necessary, the ring 27 is turned in the one or the other direction, until synchronism is attained between the oscillations of the sprung balance and those of the reference sprung balance.
  • a collet for fixing the inner end of a balance-spring of a timepiece characterized in that it comprises a cup and a radially split ring, engaged in said cup, the cup having, from its bottom provided with a central hole, bores of increasing diameter and, in its side wall, at least a cut-out part extending over a portion of its height, the ring and the cup being arranged so as to form therebetween an annular chamber receiving a portion of the balance-spring, the inner bent end of which is hooked in the split of the ring, the ring having in addition a diametral groove in one of its faces, the diameters of said bores being such that the ring, when it is partially introduced into the cup, may be turned with an easy fit in the cup and that, when it is completely pushed, it is firmly held in position in the cup, while it may still be turned in order to adjust the active length of the balance-spring and the position of its point of attachment.
  • a collet as claimed in claim 2 characterized in that the bores of the cup are interconnected by surfaces inclined at 45 and the collars are bevelled also at 45 5.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Gripping On Spindles (AREA)
US415275A 1963-12-17 1964-12-02 Collet for fixing the inner end of a balance-spring of a timepiece Expired - Lifetime US3236041A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1534163A CH407881A (fr) 1963-12-17 1963-12-17 Virole pour la fixation de l'extrémité intérieure d'un spiral de pièce d'horlogerie

Publications (1)

Publication Number Publication Date
US3236041A true US3236041A (en) 1966-02-22

Family

ID=4408295

Family Applications (1)

Application Number Title Priority Date Filing Date
US415275A Expired - Lifetime US3236041A (en) 1963-12-17 1964-12-02 Collet for fixing the inner end of a balance-spring of a timepiece

Country Status (3)

Country Link
US (1) US3236041A (fr)
CH (1) CH407881A (fr)
GB (1) GB1079497A (fr)

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CH407881A (fr) 1966-09-15
GB1079497A (en) 1967-08-16
CH1534163A4 (fr) 1965-10-30

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