US20150003217A1 - Wristwatch with sacrificial pin - Google Patents

Wristwatch with sacrificial pin Download PDF

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Publication number
US20150003217A1
US20150003217A1 US14/299,248 US201414299248A US2015003217A1 US 20150003217 A1 US20150003217 A1 US 20150003217A1 US 201414299248 A US201414299248 A US 201414299248A US 2015003217 A1 US2015003217 A1 US 2015003217A1
Authority
US
United States
Prior art keywords
pin
case
resistance
area
bracelet strand
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.)
Abandoned
Application number
US14/299,248
Other languages
English (en)
Inventor
Stephane Leoni
Thierry Altenhoven
Raphael Balmer
Martin Jufer
Damien SCHMUTZ
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
Assigned to ETA SA MANUFACTURE HORLOGERE SUISSE reassignment ETA SA MANUFACTURE HORLOGERE SUISSE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Altenhoven, Thierry, BALMER, RAPHAEL, Jufer, Martin, LEONI, STEPHANE, SCHMUTZ, DAMIEN
Publication of US20150003217A1 publication Critical patent/US20150003217A1/en
Abandoned 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
    • G04B37/00—Cases
    • G04B37/14—Suspending devices, supports or stands for time-pieces insofar as they form part of the case
    • G04B37/16—Fastening the case to the bracelet
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
    • A44C5/14—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps characterised by the way of fastening to a wrist-watch or the like
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
    • A44C5/18—Fasteners for straps, chains or the like
    • 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
    • G04B37/00—Cases
    • G04B37/14—Suspending devices, supports or stands for time-pieces insofar as they form part of the case
    • G04B37/1486—Arrangements for fixing to a bracelet

Definitions

  • the invention concerns a device for attaching a bracelet or wristlet strand to a watch case.
  • the invention further concerns a wristwatch including a case and at least one bracelet strand secured to each other.
  • the invention concerns the field of horology and jewellery, and more precisely the field of assembled units, such as wristwatches, including several components assembled to each other by a hinged connection.
  • the area of assembly of the bracelet or wristlet of a watch or piece of jewellery to a case or to a solid component is always an area where the stresses applied by the user to the bracelet, as a result of his movements, are concentrated.
  • the concentration of forces or of fatigue may cause a deterioration or even breakage of certain components, particularly the horns of the case, or even the watch case itself, particularly when it is made of a plastic material or fragile material.
  • the cost of repair or replacement is high, and damaging for the manufacturer's image.
  • EP Patent Application No 0246449A1 in the name of ETA, discloses a bracelet whose ends are retained in slots in a watch case by pins partially engaged in grooves each arranged in a face of the slots. There is no detachment of the bracelet from the case when the fastening is subjected to a predetermined force.
  • U.S. patent application No. 5,235,567A in the name of GODWIN, discloses a watch bracelet whose ends are folded over themselves and can be immobilised by transverse tubes that form pins and cooperate with transverse holes in the bracelet strands, these tubes being immobilised by a metal wire forming a spring.
  • FR Patent Application No 2323350A1 in the name of NORMAND discloses a similar system to the above with a linking member with two studs forming pins to cooperate with the horns, connected by elastic material.
  • the invention proposes to overcome the problems of the prior art by making it possible to disassemble a wristwatch unit prior to breakage of the case and/or the bracelet.
  • the invention proposes to insert a low cost sacrificial component, which plays the part of a “fuse” and protects the main components and the most expensive components.
  • said fastening element includes at least one watchmaker's pin including at least one shoulder extending in an axial direction, said pin is a sacrificial pin and includes, on said shoulder, at least one area of mechanical resistance lower than 45 MPa.
  • the invention also concerns a wristwatch including a case and at least one bracelet strand secured to each other, characterized in that the connection between said bracelet strand and said case includes a fastening element of this type.
  • said case and said bracelet strand are pivotally hinged about a shoulder of a pin which forms said fastening element and which is a sacrificial pin which includes, on said shoulder, at least one area of mechanical resistance lower than the lowest mechanical resistance of said case and than the lowest mechanical resistance of said bracelet strand.
  • FIG. 2 shows a schematic cross-section through the axis of a sacrificial pin according to the invention forming this fastening element in a first variant, and fitted into a series of holes comprised in alternate clevis mounts in the case and the bracelet strand, in a first embodiment wherein the sacrificial pin includes notches forming break-off points.
  • FIG. 3 shows a similar schematic view to FIG. 2 of a second embodiment wherein the pin includes alternate rigid elements and flexible overmoulded elements.
  • FIG. 4 shows a similar schematic view to FIG. 2 of a third embodiment wherein the pin includes a flexible body overmoulded onto rigid rings arranged perpendicular to the clevis mounts of the case.
  • FIG. 5 shows a similar schematic view to FIG. 2 of a fourth embodiment wherein the pin includes a rigid body onto which rings made of a flexible material, such as an elastomer, are overmoulded.
  • FIG. 6 shows a similar schematic view to FIG. 2 of another embodiment wherein a notch forming a break-off point is situated between a horn of the case and the end of the bracelet strand.
  • FIG. 7 shows a similar schematic view to FIG. 2 of another embodiment wherein a notch forming a break-off point is situated between a pump housed in a blind hole in a horn of the case on the one hand, and the end of the bracelet strand on the other.
  • FIG. 8 shows a similar schematic view to FIG. 2 of the same first embodiment wherein the holes of the clevis mount of the case are bushed.
  • FIG. 9 shows a similar schematic view to FIG. 2 of the same first embodiment wherein the holes of the clevis mount of the bracelet strand are bushed.
  • the invention concerns the fields of horology and jewellery and more specifically the field of assembled units, such as wristwatches, including several components assembled to each other by a hinged connection.
  • the invention is described here with a preferred and non-limiting application relating to the securing, particularly of the hinged type, of bracelet strands to a watch case; it could also concern the securing, particularly of the hinged type, of a bracelet strand to a clasp, or even of two components of a bracelet secured and/or hinged to each other.
  • the invention concerns a device 100 for fastening a bracelet strand 3 to a case 2 of a watch 4 .
  • this device 100 includes at least one fastening element 101 making it possible to detach the bracelet strand 3 from the case 2 , when said fastening element 1 is subjected to a predetermined force or moment, and in particular to a traction force of less than 330N.
  • fastening element 101 is arranged to break when it is subjected to a force comprised between 300 N and 330 N.
  • this fastening element 101 includes at least one watchmakers pin 1 , which includes at least one shoulder 10 extending in an axial direction D1.
  • This pin 1 is a sacrificial pin and includes, on shoulder 10 thereof, at least one area 11 of mechanical resistance lower than 45 MPa, in the case of a watch case made of MABS or ABS or similar.
  • end link 103 includes, at the first end 104 thereof, a pin 1 of this type.
  • the invention also concerns a wristwatch 4 including a case 2 and at least one bracelet link 3 secured to each other.
  • the connection between bracelet strand 3 and case 2 includes a fastening device 100 of this type.
  • case 2 and bracelet strand 3 are pivotally hinged about a shoulder 10 of a pin 1 which forms both the hinge pin and the fastening device 100 and which is a sacrificial pin.
  • this sacrificial pin 1 includes, on shoulder 10 , at least one area 11 of mechanical resistance lower than the lowest mechanical resistance of case 2 and than the lowest mechanical resistance of bracelet strand 3 .
  • Pin 1 secures bracelet strand 3 to case 2 , and protects case 2 in the event of extremestressor inappropriate manipulation of the bracelet.
  • pin 1 includes a plurality of areas 11 of low resistance.
  • pin 1 The user visually observes the breakage of pin 1 according to the invention; however the breakage does not necessarily cause the immediate detachment of case 2 and bracelet strand 3 , when pin 1 is held at several points.
  • FIGS. 1 to 5 show a watch variant including a row of first clevis mounts 5 staggered with a row of second clevis mounts 6 comprised in bracelet strand 3 .
  • FIG. 7 shows yet another variant wherein pin 1 includes pumps 19 at both ends thereof, elastically housed inside blind holes 29 in horns 28 of case 2 .
  • case 2 includes at least a first clevis mount 5 with a first hole 50 along a first axis D1
  • the at least one bracelet strand 3 includes at least a second clevis mount 6 with a second hole 60 along a second axis D2.
  • This bracelet strand 3 is fastened to the at least one first clevis mount 5 of case 2 by sacrificial pin 1 .
  • the at least one shoulder 10 is dimensioned to pass into first hole 50 and into second hole 60 , to pivotally guide and assemble bracelet strand 3 and case 2 .
  • shoulder 10 is cylindrical, and all of first holes 50 are aligned and have the same diameter, as is also the case of all the second holes 60 , it is possible to envisage variants having a different geometry.
  • deformable variants will be seen below wherein shoulder 10 is not cylindrical over the entire length thereof when pin 1 is in the free state.
  • the resistance of pin 1 to traction, shearing, torsion and fatigue, is lower in each case than the respective lowest resistance of case 2 and of bracelet strand 3 which the pin pivotally guides.
  • each first clevis mount 5 includes at least a first lateral face 51 which is radial relative to first axis D1, namely a first lateral face 51 for each end clevis mount 5 , and two first lateral faces 51 on both sides of each first inner clevis mount 5 .
  • each second clevis mount 6 includes at least one second lateral face 61 which is radial relative to second axis D2, two in the case of the Figures which show more first clevis mounts 5 than second clevis mounts 6 .
  • This value is suitable for a particular embodiment with a pin 1 made of DIN 1.4404 steel with a diameter of 1.0 mm, a case 2 made of rigid plastic material, such as MABS “Terlux” or ABS “Magnum” or similar, a bracelet 3 that is hinged or made of flexible material, such as flexible plastic material, rubber, leather, steel etc., with holes 50 with a nominal diameter of 1.0 to 1.1 mm, holes 60 with a nominal diameter of 1.0 to 1.2 mm, said holes 50 and 60 could be the holes of DIN 1.4404 steel tubes driven into first clevis mounts 5 and/or second clevis mounts 6 .
  • the bar according to the invention must be adapted to the case and to the bracelet that it connects, so as to break in the event of excessive load.
  • the employment of the weakest bar can be generalised for all applications.
  • pin 1 must break for a force applied in any direction, well below 300 N.
  • at least one area 11 of low resistance of pin 1 is situated, when bracelet strand 3 is assembled and hinged in position on case 2 by pin 1 , perpendicular to an interface area 40 , where the shearing stress is highest.
  • At least a first clevis mount 5 is bushed with a metal insert 52 including its first hole 50 .
  • the rings are on the bracelet strand rather than on the case, as in FIG. 9 .
  • At least a second clevis mount 6 is bushed with a metal insert 62 including its second hole 60 .
  • This arrangement is advantageous when bracelet strand 3 is flexible, since it allows for rigid guiding of pin 1 and may attenuate wear.
  • first clevis mounts 5 are bushed with inserts 51 and second clevis mounts 6 are also bushed with inserts 62 .
  • the peripheral shoulder 10 of pin 1 includes, over the length thereof, first areas 13 of higher resistance alternating with second areas 14 of lower resistance.
  • FIG. 3 illustrates an example embodiment where first areas 13 of higher resistance are made of rigid metal material or hard plastic material, and where second areas 14 of lower resistance are made of flexible elastomer overmoulded on first areas 13 of higher resistance.
  • At least one said area 11 of low resistance is formed by the interface area between a second area 14 of lower resistance and a first area 13 .
  • FIG. 3 shows a variant where each first area 13 of higher resistance faces a second hole 60 : sections 13 are located perpendicular to second holes 60 of second clevis mounts 6 , whereas second areas 14 , particularly made of elastomer overmoulded on sections 13 and alternating therewith, face first holes 50 of first clevis mounts 5 : said second areas 14 include flanges 141 and 142 , pin 1 is inserted into holes 50 and 60 with tightening achieved via these flanges.
  • FIG. 4 shows tubular sections 13 perpendicular to second holes 60 of second clevis mounts 6 , whereas second areas 14 , notably made of plastic material such as polyamide or similar, overmoulded onto sections 13 and forming a single piece element over the entire length of pin 1 , face first holes 50 of first clevis mounts 5 .
  • FIG. 5 shows the reverse configuration of FIG. 4 : it is the core which is rigid and the tubes are made of plastic overmoulded on the pin.
  • each first area 13 of higher resistance faces a first hole 50 .
  • Tubular sections 13 are perpendicular to first holes 50 of first clevis mounts 5 , while second areas 14 made of elastomer overmoulded onto sections 13 and forming a single piece element over the entire length of pin 1 , face second holes 60 of second clevis mounts 6 .
  • At least one area 11 of low resistance is formed by a second area 14 of lower resistance.
  • FIGS. 1 and 6 to 9 illustrate variants where at least one area 11 of low resistance includes at least one notch 12 or where every area of low resistance 11 includes a notch 12 .
  • This notch preferably has a V-shaped profile or similar, so as to form a break-off point.
  • pin 1 is made of a plastic material chosen from among polyoxymethylene (POM), polytetrafluorethylene (PTFE) filled with glass fibre to improve its mechanical features, poly(p-phenylsulfide) (PPS) filled with glass fibre to improve its mechanical features, polyamide-imide (PAI), polyether ether ketone (PEEK), or even polybenzimidazole (PBI), or suchlike.
  • POM polyoxymethylene
  • PTFE polytetrafluorethylene
  • PPS poly(p-phenylsulfide)
  • PAI polyamide-imide
  • PEEK polyether ether ketone
  • PBI polybenzimidazole
  • the invention also concerns a sacrificial watchmakers pin 1 including at least one shoulder 10 extending in an axial direction D1 and which includes, on said shoulder 10 , at least one area 11 of mechanical resistance lower than 45 MPa, the value depending on the construction and material of watch case 2 , said value of 45 MPa corresponds to a case 2 made of MABS or ABS.
  • This sacrificial pin 1 may be made in accordance with any of the arrangements described above for pin 1 of wristwatch 4 and illustrated in the Figures.
  • the invention is particularly well suited to the protection of watch cases made of light or fragile materials, such as plastic materials, light alloys, glass, in particular when they are hollow and/or made with walls of small thickness on bracelet fastening elements.
  • the invention offers the advantage of protecting both the case and the associated bracelet strand.
  • the invention makes it possible to improve a watch simply by replacing, in the initial assembly or after sales-service, existing pins or bars with a sacrificial pin according to the invention, which is inexpensive and requires no modification of the assembly process.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Clamps And Clips (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Adornments (AREA)
  • Electric Clocks (AREA)
US14/299,248 2013-06-27 2014-06-09 Wristwatch with sacrificial pin Abandoned US20150003217A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13174090.4 2013-06-27
EP13174090.4A EP2818942B1 (fr) 2013-06-27 2013-06-27 Montre-bracelet avec goupille sacrificielle

Publications (1)

Publication Number Publication Date
US20150003217A1 true US20150003217A1 (en) 2015-01-01

Family

ID=48745731

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/299,248 Abandoned US20150003217A1 (en) 2013-06-27 2014-06-09 Wristwatch with sacrificial pin

Country Status (6)

Country Link
US (1) US20150003217A1 (ja)
EP (1) EP2818942B1 (ja)
JP (1) JP5873530B2 (ja)
KR (1) KR20150001673A (ja)
CN (2) CN204287755U (ja)
HK (2) HK1194607A2 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10281883B2 (en) * 2016-12-20 2019-05-07 Motorola Mobility Llc Wearable electronic device adapted for supporting wireless communications
US11388961B2 (en) 2018-02-16 2022-07-19 Rolex Sa Device for adjusting the length of a bracelet

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2818942B1 (fr) * 2013-06-27 2019-06-05 ETA SA Manufacture Horlogère Suisse Montre-bracelet avec goupille sacrificielle
EP2985661A1 (fr) * 2014-08-12 2016-02-17 ETA SA Manufacture Horlogère Suisse Boîte de montre munie d'un élément d'habillage
EP3958069B1 (fr) * 2020-08-18 2024-06-12 The Swatch Group Research and Development Ltd Boîte de montre munie d'un élément d'habillage

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308505A (en) * 1941-03-17 1943-01-19 Arthur J Geoffrion Spring bar for wrist watches
US4429785A (en) * 1981-02-26 1984-02-07 Manfred Dango Curve-negotiating plate conveyor
US5235567A (en) * 1992-12-04 1993-08-10 Goodwin Charles M Quick release watchband
US5483505A (en) * 1992-12-15 1996-01-09 Mauboussin, S.A. Quick-fixing device for a watchband
US20040032798A1 (en) * 2000-06-23 2004-02-19 Herve Guillaume Watch with elastic band comprising a single strand
US20040184358A1 (en) * 2003-03-10 2004-09-23 Haruki Hiranuma Band link coupling pin, band, and wristwatch
US20120069720A1 (en) * 2009-06-08 2012-03-22 Rolex S.A. Watchstrap made of hinged links
US20120144862A1 (en) * 2010-12-08 2012-06-14 Rolex S.A. Bracelet with articulated links and use of this bracelet
US20120159987A1 (en) * 2011-04-01 2012-06-28 Kurt Walchle Paracord bracelet with shackle connector

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2323350A1 (fr) * 1975-04-23 1977-04-08 Normand Gerard Dispositif d'attache de bracelet
CH647917GA3 (ja) * 1982-06-11 1985-02-28
CH667770GA3 (ja) * 1986-05-07 1988-11-15
CH667566GA3 (ja) * 1987-02-25 1988-10-31
CH692014A5 (fr) * 1997-12-18 2002-01-15 Smh Man Services Ag Bracelet-montre dont le bracelet est attaché à la montre par un lien.
EP1070997A1 (fr) * 1999-07-22 2001-01-24 The Swatch Group Management Services AG Montre-bracelet réversible
EP1836917B1 (fr) * 2006-03-24 2008-03-26 The Swatch Group Management Services AG Bracelet à longueur réglable
EP2057914B1 (fr) * 2007-11-06 2016-07-06 Rolex Sa Bracelet à maillons articulés
EP2604140B1 (fr) * 2011-12-16 2014-08-13 The Swatch Group Management Services AG Maillon anti-rotation
EP2818942B1 (fr) * 2013-06-27 2019-06-05 ETA SA Manufacture Horlogère Suisse Montre-bracelet avec goupille sacrificielle

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2308505A (en) * 1941-03-17 1943-01-19 Arthur J Geoffrion Spring bar for wrist watches
US4429785A (en) * 1981-02-26 1984-02-07 Manfred Dango Curve-negotiating plate conveyor
US5235567A (en) * 1992-12-04 1993-08-10 Goodwin Charles M Quick release watchband
US5483505A (en) * 1992-12-15 1996-01-09 Mauboussin, S.A. Quick-fixing device for a watchband
US20040032798A1 (en) * 2000-06-23 2004-02-19 Herve Guillaume Watch with elastic band comprising a single strand
US20040184358A1 (en) * 2003-03-10 2004-09-23 Haruki Hiranuma Band link coupling pin, band, and wristwatch
US20120069720A1 (en) * 2009-06-08 2012-03-22 Rolex S.A. Watchstrap made of hinged links
US20120144862A1 (en) * 2010-12-08 2012-06-14 Rolex S.A. Bracelet with articulated links and use of this bracelet
US20120159987A1 (en) * 2011-04-01 2012-06-28 Kurt Walchle Paracord bracelet with shackle connector

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Glass-Filled Coumpounded PTFE and Teflon", 18 June 2012, Fluoro-Plastics Inc., <http://catalog.fluoropolymerproducts.com/viewitems/reinforced-ptfe-teflon/glass-filled-compounded-teflon-ptfe-2>, pg. 1 *
Equivalent Specifications, 9 March 2012, Columbus Stainless Ltd., whole document, Retrieved on 29 October 2015 from <https://web.archive.org/web/20120309204954/http://www.columbus.co.za/products/equivalent-specifications.html> *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10281883B2 (en) * 2016-12-20 2019-05-07 Motorola Mobility Llc Wearable electronic device adapted for supporting wireless communications
US11388961B2 (en) 2018-02-16 2022-07-19 Rolex Sa Device for adjusting the length of a bracelet

Also Published As

Publication number Publication date
EP2818942B1 (fr) 2019-06-05
CN104252125B (zh) 2019-01-15
JP2015011028A (ja) 2015-01-19
CN204287755U (zh) 2015-04-22
JP5873530B2 (ja) 2016-03-01
KR20150001673A (ko) 2015-01-06
CN104252125A (zh) 2014-12-31
EP2818942A1 (fr) 2014-12-31
HK1194607A2 (en) 2014-10-17
HK1205568A1 (en) 2015-12-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ETA SA MANUFACTURE HORLOGERE SUISSE, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LEONI, STEPHANE;ALTENHOVEN, THIERRY;BALMER, RAPHAEL;AND OTHERS;REEL/FRAME:033067/0127

Effective date: 20140519

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION