EP4296790A1 - Spiralklötzchenträgervorrichtung - Google Patents

Spiralklötzchenträgervorrichtung Download PDF

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Publication number
EP4296790A1
EP4296790A1 EP22180223.4A EP22180223A EP4296790A1 EP 4296790 A1 EP4296790 A1 EP 4296790A1 EP 22180223 A EP22180223 A EP 22180223A EP 4296790 A1 EP4296790 A1 EP 4296790A1
Authority
EP
European Patent Office
Prior art keywords
contact
eyebolt
contact zone
stiffness
midpoint
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.)
Pending
Application number
EP22180223.4A
Other languages
English (en)
French (fr)
Inventor
Jean-Luc Helfer
Olivier Mertenat
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.)
ETA SA Manufacture Horlogere Suisse
Original Assignee
ETA SA Manufacture Horlogere Suisse
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 ETA SA Manufacture Horlogere Suisse filed Critical ETA SA Manufacture Horlogere Suisse
Priority to EP22180223.4A priority Critical patent/EP4296790A1/de
Priority to JP2023079818A priority patent/JP2024000966A/ja
Priority to KR1020230075813A priority patent/KR20230174715A/ko
Priority to CN202321510159.9U priority patent/CN220232253U/zh
Priority to CN202310702015.1A priority patent/CN117270364A/zh
Priority to US18/337,162 priority patent/US20230408979A1/en
Publication of EP4296790A1 publication Critical patent/EP4296790A1/de
Pending 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
    • 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
    • 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
    • G04B17/325—Component parts or constructional details, e.g. collet, stud, virole or piton for fastening the hairspring in a fixed position, e.g. using a block
    • 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 invention relates to a pin holder device incorporated in a watch movement, more precisely arranged on a balance bridge.
  • This eyebolt holder includes a circular split ring which includes two symmetrical arms having a certain elasticity to allow friction mounting of the eyebolt holder on the balance bridge.
  • the inner circle of the split ring is provided with a diameter a little smaller than that of the chimney or of the circular part of the support of the anti-shock bearing intended to receive the eyebolt holder, so that the two elastic arms meet spread a little during assembly to ensure a certain tightening and obtain the desired friction.
  • the eyebolt holder undergoes during assembly a small movement along the axis passing through the center of said circle and the middle of the opening between the elastic arms, in the direction opposite to that of this opening from said center.
  • the part of the eyebolt holder on which the eyebolt is fixed is arranged on said axis opposite the opening of the split ring.
  • this problem remains whatever the angular position of the part to which the eyebolt is fixed relative to the center of the split ring. Indeed, in all cases, this fixing part of the eyebolt undergoes the translation of a part of the split ring diametrically opposite to its opening which takes place along said axis passing through the center of this opening during friction mounting of the eyebolt holder on the balance bridge.
  • the document CH 604226 discloses a eyebolt holder configured to be bayonet mounted on a part of the balance bridge and held in a given angular position by friction of the ring forming the eyebolt holder on this part.
  • the part of the balance bridge in question is a piece driven into a hole in the board of the balance bridge and projecting above this board. This part is designed to receive a bearing of the balance wheel.
  • the ring has an internal flat which ensures, following a rotation of the eyebolt holder to close the bayonet system, clamping at three points of a side wall of the aforementioned part by this ring to maintain angular positioning by friction of the ring.
  • the document EP 1798609 also discloses a piton holder forming a bayonet system with a projecting part of the balance bridge, as shown in figure 2 of this document.
  • the eyebolt holder is distinguished by three bosses which are located inside the ring surrounding the protruding part and which form the bayonet system. These three bosses participate in the bayonet system by allowing in a first step the eyebolt holder to be freely placed in place at the right level around the protruding part then to close the bayonet system by inserting itself by rotating the holder eyebolt in three respective lateral grooves machined in the part protruding. Hard friction is provided to prevent the eyebolt holder from having any play relative to the protruding part.
  • the aim of the invention is to provide an eyebolt holder which does not have the disadvantages of the eyebolt holders of the prior art which are mentioned above.
  • the invention aims to provide a eyebolt holder making it possible to obtain a very precise positioning of the eyebolt in the general plane of the eyebolt holder, in particular a very precise and predetermined radial positioning relative to the axis of rotation of the sprung balance.
  • the invention relates to a eyebolt holder intended to be mounted on a balance bridge of a mechanical watch movement and comprising a eyebolt fixing part and a clamping part which is designed to be able to tighten a wall lateral of a projecting part of the balance bridge or of a part mounted on this balance bridge.
  • the clamping part defines three contact zones intended, once the eyebolt holder is mounted on the balance bridge, to press against the side wall of the protruding part or part, a first contact zone among the three contact zones being connected to a second contact zone among these three contact zones, which is adjacent to the first contact zone, by a first part of the part clamp, which has between the first and second contact zones a first separation zone, and to the third contact zone among the three contact zones, which is also adjacent to the first contact zone, by a second part of the clamping part which has a second separation zone between the first and third contact zones.
  • the first and second separation zones are provided, once the eyebolt holder is mounted on the balance bridge, set back from the side wall of the projecting part or part.
  • the first part has a first stiffness at a second midpoint of the second contact zone, relative to a first midpoint of the first contact zone, which is greater than three times a second stiffness that the second part presents at a third midpoint of the third contact zone relative to the first midpoint of the first contact zone.
  • the first stiffness is greater than seven times the second stiffness.
  • the first stiffness is greater than twelve times the second stiffness.
  • the eyebolt holder comprises a clamping part 12 which is designed to be able to clamp a side wall 16 of the projecting part 6 or, in a variant, of a part mounted on this balance bridge.
  • This projecting part or part has a cylindrical or slightly frustoconical part whose cylindrical or frustoconical outer surface defines the side wall 16 and whose central axis 14 defines the axis of rotation of the balance wheel.
  • the aforementioned part is in particular a part of a racket, comprising the eyebolt holder in question, or a bearing support provided for the sprung balance.
  • the eyebolt support 2 is mounted on a frustoconical part, the circular section of this part increases moving away from the board 5 of the balance bridge 4.
  • the expression 'mounted on' does not mean that the part is necessarily at the -top of the balance bridge board relative to the space provided for the sprung balance. Indeed, in certain embodiments, the eyebolt holder can be arranged below the balance bridge board, on the sprung balance side.
  • first contact zone 18 and the second contact zone 20 are tangent, in a general plane in which the clamping part 12 extends generally, to a geometric circle 17 respectively at a first midpoint 28 of the first contact zone and at a second midpoint 30 of the second contact zone.
  • respective extents of the first and second contact zones are determined by the first and second contact points at the geometric circle 17 which is tangent to the first and second contact zones at these first and second contact points, which define the first and second midpoints respectively.
  • the three contact zones are flat.
  • at least the first and second contact zones 18, 20 are plane and, in the general plane in which the clamping part extends generally, orthogonal respectively to the two radii, from the center 15 of the geometric circle 17, which pass respectively by the first and second midpoints 28, 30.
  • the first and second contact zones are concave, in an arc of the same radius and same center as the geometric circle 17.
  • the contact zones are provided slightly convex, for example in an arc circle of the same radius as that of said geometric circle.
  • the first part 24 has a first stiffness K1 at the level of the second midpoint 30 of the second contact zone 20, relative to the first midpoint 28 of the first contact zone 18, which is greater than three times a second stiffness K2 that the second part 26 presents at the level of a third midpoint 32 of the third contact zone 22 relative to the first midpoint 28 of the first contact zone, i.e. K1 > 3 ⁇ K2.
  • the stiffness considered is a bending stiffness and that the elastic constant of the first part, respectively of the second part, is defined by the inverse of its bending stiffness.
  • the first stiffness K1 is greater than seven times the second stiffness K2, i.e. K1 > 7 ⁇ K2.
  • the first stiffness K1 is greater than twelve times the second stiffness K2, i.e. K1 > 12 ⁇ K2.
  • the width L2 0.55 L1
  • the bending stiffness K varies with the width L to the third power, i.e. K ⁇ L 3 , of the part considered (here a circular arm) and also with its length to the third power, i.e. K ⁇ (R ⁇ ) 3 with R the average radius of the circular arm and ⁇ the angular distance of this circular arm.
  • K1 K2 ⁇ (1.5) 3 ⁇ (1.8) 3
  • K1 approximately 20 ⁇ K2.
  • the first stiffness K1 is approximately twenty times greater than the second stiffness K2. Consequently, in the example shown, the elasticity of the second part 26, more specifically of the second separation zone 27, is approximately twenty times greater than the elasticity of the first part 24, more specifically of the first separation zone. separation 25.
  • the first angle ⁇ is substantially equal to ninety degrees (90°)
  • the third midpoint 32 then having a second angle ⁇ relative to the first midpoint 28, from the center 15 of the geometric circle 17, substantially equal to one hundred and thirty-five degrees (135°).
  • the eyebolt holder 2 it is possible to mount the eyebolt holder on the protruding part 6 of the balance bridge while ensuring very precise radial positioning of the opening 8, and thus of the eyebolt 9, relative to the central axis 14 of the projecting part which coincides with the axis of oscillation of the sprung balance.
  • precise positioning in a general plane of the eyebolt holder, which is perpendicular to the axis of rotation 14 of the balance is obtained thanks to the two contact zones 18 and 20 which have an angular offset between them, advantageously between 60 ° and 120°, preferably 90°.
  • eyebolt once the eyebolt holder is angularly positioned on the projecting part 6, given that the fixing part 10 of the eyebolt is rigidly connected to the first rigid part of the clamping part 12.
  • the piton holder 2 also includes a free part 36 which extends the first part 24 beyond the second contact zone 20.
  • This free part has several functions, namely a safety function to prevent an impact from dismounting laterally. the eyebolt holder, a mounting function to allow a specific tool to temporarily move the third contact zone 22 away from the center 15, and an aesthetic function.
  • THE Figures 2A and 2B concern a second variant of the first embodiment which is distinguished from this first embodiment essentially by the fact that the first angle ⁇ and the second angle ⁇ are equal and are each worth one hundred and twenty degrees (120°).
  • the first angle ⁇ also called the first angular distance
  • the second angle ⁇ also called the second angular distance
  • the various parts of the eyebolt holder 42 which comprises a clamping part 12A with a first part 24A, connecting the contact zones 18 and 20 and defining a first separation zone 25A, and a second part 26A connecting the zones of contact 18 and 22 and defining a second separation zone 27A.
  • the eyebolt holder 42 does not include any additional free part.
  • the first stiffness K1 of the first part 24A, more specifically of the first separation zone 25A, is approximately five times greater than the second stiffness K2 of the second part 26A, more specifically of the second separation zone 27A. Consequently, in the example shown, the elasticity of the second part 26A, more specifically of the second separation zone 27A, is approximately five times greater than the elasticity of the first part 24A, more specifically of the first separation zone. separation 25A. It will be noted that this value varies quite greatly with a relatively small variation in the ratio of the widths L1 and L2. Generally speaking, the ratio between the first stiffness K1 and the second stiffness K2 is expected to be greater than three. Advantageously this ratio is expected to be greater than seven, which can easily be obtained with the second variant. Preferably, the K1/K2 ratio is expected to be greater than twelve.
  • FIGS. 3A and 3B show a second embodiment of a roof rack according to the invention.
  • the parts of the eyebolt holder 52 which are identical or similar to those of the first embodiment and which have already been described previously will not be described again here in detail. We will therefore refer to the description of the first embodiment for these identical or similar parts. Note that the letter 'B' appended to a number in a reference indicates that it is a part similar or similar to that bearing this number as a reference in the first embodiment.
  • the clamping part 12B also comprises a second part 26B connecting the first contact zone 18 to the third contact zone 22.
  • the clamping part defines a fourth contact zone 56 which is intended, once the eyebolt holder 52 mounted on the balance bridge, to be pressed against the side wall 16 of the projecting part 6 of the balance bridge (not shown) or a part fixed to this balance bridge.
  • This fourth contact zone 56 is adjacent to the second contact zone 20 and connected to this second contact zone by a third part 54 of the clamping part 12B which has, between the second and fourth contact zones, a third separation zone 55
  • the third part 54 has a third stiffness K3 at a fourth midpoint 58 of the fourth contact zone, relative to the second midpoint 30 of the second contact zone, which is less than a third of the first stiffness K1 of the first part 24.
  • the first stiffness K1 is greater than seven times the third stiffness K3, i.e. K1 > 7 ⁇ K3.
  • the third part 54 is elastic.
  • Doubling the second elastic part with the third elastic part increases the total clamping force of the eyebolt holder on the protruding part 6.
  • the value of the width L2 of the separation zones defined by the second and third parts 26B can be selected and 54 to determine the elasticity of these two parts.
  • the fourth contact zone 56 is located inside the geometric circle 17, tangent to the first and second contact zones 18 and 20 at their midpoints, before mounting the eyebolt holder on the balance bridge. To determine the total clamping force, we can further select the radial distance of the contact zones 22 and 56 for the eyebolt holder not mounted on the balance bridge.
  • the second and third parts 26B and 54 have at their respective free ends two parts 62 and 64 which extend radially and which are provided to facilitate the mounting of the eyebolt holder 52, around the projecting part 6 of the balance bridge, at using a tool 66.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Clamps And Clips (AREA)
  • Springs (AREA)
  • Jigs For Machine Tools (AREA)
EP22180223.4A 2022-06-21 2022-06-21 Spiralklötzchenträgervorrichtung Pending EP4296790A1 (de)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP22180223.4A EP4296790A1 (de) 2022-06-21 2022-06-21 Spiralklötzchenträgervorrichtung
JP2023079818A JP2024000966A (ja) 2022-06-21 2023-05-15 バランスばねスタッドホルダーデバイス
KR1020230075813A KR20230174715A (ko) 2022-06-21 2023-06-13 밸런스-스프링 스터드 홀더 디바이스
CN202321510159.9U CN220232253U (zh) 2022-06-21 2023-06-14 游丝外桩保持件
CN202310702015.1A CN117270364A (zh) 2022-06-21 2023-06-14 游丝外桩保持件装置
US18/337,162 US20230408979A1 (en) 2022-06-21 2023-06-19 Balance-spring stud holder device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22180223.4A EP4296790A1 (de) 2022-06-21 2022-06-21 Spiralklötzchenträgervorrichtung

Publications (1)

Publication Number Publication Date
EP4296790A1 true EP4296790A1 (de) 2023-12-27

Family

ID=82163526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22180223.4A Pending EP4296790A1 (de) 2022-06-21 2022-06-21 Spiralklötzchenträgervorrichtung

Country Status (5)

Country Link
US (1) US20230408979A1 (de)
EP (1) EP4296790A1 (de)
JP (1) JP2024000966A (de)
KR (1) KR20230174715A (de)
CN (2) CN117270364A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368070A1 (fr) 1976-10-12 1978-05-12 Ebauchesfabrik Eta Ag Disp
CH604226B5 (de) 1975-12-12 1978-08-31 Ebauchesfabrik Eta Ag
EP1798609A2 (de) 2005-12-14 2007-06-20 Patek Philippe Sa Mechanische Vorrichtung zur Einstellung der Hemmung eines Regulierorgans
CH712854A1 (fr) * 2016-08-29 2018-03-15 Richemont Int Sa Porte-piton et procédé de réglage de la position d'un piton dans un tel porte-piton.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH604226B5 (de) 1975-12-12 1978-08-31 Ebauchesfabrik Eta Ag
FR2368070A1 (fr) 1976-10-12 1978-05-12 Ebauchesfabrik Eta Ag Disp
EP1798609A2 (de) 2005-12-14 2007-06-20 Patek Philippe Sa Mechanische Vorrichtung zur Einstellung der Hemmung eines Regulierorgans
CH712854A1 (fr) * 2016-08-29 2018-03-15 Richemont Int Sa Porte-piton et procédé de réglage de la position d'un piton dans un tel porte-piton.

Also Published As

Publication number Publication date
CN117270364A (zh) 2023-12-22
US20230408979A1 (en) 2023-12-21
JP2024000966A (ja) 2024-01-09
KR20230174715A (ko) 2023-12-28
CN220232253U (zh) 2023-12-22

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