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EP3744209A1 - Elastisches armband mit gliedern - Google Patents

Elastisches armband mit gliedern Download PDF

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Publication number
EP3744209A1
EP3744209A1 EP19177095.7A EP19177095A EP3744209A1 EP 3744209 A1 EP3744209 A1 EP 3744209A1 EP 19177095 A EP19177095 A EP 19177095A EP 3744209 A1 EP3744209 A1 EP 3744209A1
Authority
EP
European Patent Office
Prior art keywords
bracelet
rods
link
links
passages
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.)
Granted
Application number
EP19177095.7A
Other languages
English (en)
French (fr)
Other versions
EP3744209B1 (de
Inventor
Sandrine DUPUIS
Jean-Baptiste LE BRIS
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.)
Patek Philippe SA Geneve
Original Assignee
Patek Philippe SA Geneve
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 Patek Philippe SA Geneve filed Critical Patek Philippe SA Geneve
Priority to EP19177095.7A priority Critical patent/EP3744209B1/de
Publication of EP3744209A1 publication Critical patent/EP3744209A1/de
Application granted granted Critical
Publication of EP3744209B1 publication Critical patent/EP3744209B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A44HABERDASHERY; JEWELLERY
    • A44CPERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C5/00Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
    • A44C5/0053Flexible straps
    • A44C5/0069Flexible straps extensible
    • AHUMAN NECESSITIES
    • A44HABERDASHERY; JEWELLERY
    • A44CPERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C5/00Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
    • A44C5/02Link constructions
    • A44C5/04Link constructions extensible
    • A44C5/08Link constructions extensible having separate links

Definitions

  • the present invention relates to an elastic link bracelet, in particular for a watch, comprising two rows of lateral links, each link of a row of lateral links being connected to a link of the other row of lateral links by two rods arranged perpendicular to the longitudinal direction of the bracelet, and comprising at least one row of central links each articulated on two rods connected to different lateral links, the central links each comprising a tubular envelope which is oriented parallel to the rods and which is closed on at least one side by an insert in which at least one passage has been arranged, arranged to allow the two rods on which the central link is articulated to pass through the insert, at least one of the two rods on which the central link is articulated being further stressed, in direction of the other rod, by at least one elastic element housed in the tubular casing.
  • each central link comprises a central housing passing right through the link perpendicular to the longitudinal direction of the bracelet.
  • the housing is partially closed on one side by a wall pierced with a first longitudinal slot, and an insert pierced with a second longitudinal slot is provided to allow the other side of the housing to be partially closed as well.
  • Two screws which are connected to pairs of different side links enter the central housing through the first longitudinal slot, and exit through the second slot, so that they pass right through the central link.
  • Two compression springs are still arranged inside the housing central. These springs are arranged parallel to the longitudinal direction of the bracelet, in the extension of one another.
  • the two screws which pass through the central link are inserted so that the springs are respectively compressed between the two ends of the central housing, on the one hand, and the two screws, on the other hand.
  • the two screws on which the central link is articulated have the possibility of shifting transversely (parallel to the longitudinal direction of the bracelet) so as to deviate more or less l 'against each other against the two compression springs. It will be understood that this last characteristic allows this known bracelet to lengthen under the effect of a tensile force.
  • the elastic link bracelet of the prior art which has just been described has certain defects.
  • the two screws on which a central link is articulated penetrate and emerge on either side of the central housing by borrowing the same two longitudinal slots.
  • the only terminal limiting the transverse offset of a screw along the longitudinal slots is the presence of the other screw which is itself urged in the other direction by the spring which is associated with it.
  • the two screws can therefore in theory abut one against the other halfway along the longitudinal slots.
  • An aim of the present invention is to remedy the drawbacks of the prior art which have just been explained.
  • the present invention achieves this and other object by providing an elastic link bracelet according to the appended claim 1.
  • the inserts which close at least one side of each central link have two passages arranged so as to each receive one of the two rods which pass through the insert. At least one of the two passages is dimensioned so as to receive and guide the rod with a certain clearance oriented parallel to the longitudinal direction of the bracelet.
  • the two passages are separated from each other by an in-between delimited by two bearing surfaces oriented back to back. It will be understood that the two bearing surfaces of an insert play the role of stops making it possible to maintain the two rods, on which a central link is articulated, away from each other. Thanks to this characteristic, an elastic link bracelet according to the invention has the same appearance as an ordinary bracelet when it is not worn.
  • the elastic elements which are housed in the tubular envelopes of the central links are prestressed, so that the force with which they recall at least one of the two rods on which the central links are articulated against the surface of corresponding support is equal to at least half of the total weight of the bracelet, including the weight of any accessory attached to the strap (for example, in the case of a watch strap, the weight of the wristwatch as a whole). It will be understood that due to this characteristic, a tensile force exerted on the bracelet must exceed the force with which the elastic members are pre-stressed before the bracelet begins to elongate.
  • the tensile force exerted by gravity on the links of the bracelet, when it is suspended by its clasp is equal to half of the total weight of the bracelet. It will therefore be understood that the fact that the springs are preloaded allows the bracelet to retain its minimum length when it is suspended by its clasp.
  • the bracelet of the invention is always adjusted so as to be both aesthetic and comfortable.
  • the figure 1 is an exploded perspective view of a portion of an elastic metal link bracelet which conforms to an exemplary embodiment of the invention.
  • the strap of the present example is a watch strap. It can be seen that this bracelet comprises two rows of lateral links (respectively referenced 4a and 4b), and that each link 4a of a row of lateral links is designed to be connected to a link 4b of the other row of lateral links by two rods or pins (referenced 3) arranged perpendicular to the longitudinal direction of the bracelet.
  • the bracelet also comprises a row of central links each articulated on two pins connected to different lateral links 4a, 4b.
  • the central links comprise a tubular casing 1 oriented perpendicularly to the longitudinal direction of the bracelet.
  • these tubular envelopes are made of metal, preferably of precious metal. Note that it is possible to make envelopes 1 of relatively easy way. They can for example be obtained by extrusion then cut to the desired length and polished.
  • each central link of the bracelet contains a compartment 5 which is arranged in the middle part of the tubular casing 1 between the two inserts 2a and 2b (a single compartment 5 is shown in the figure 1 inside the third central link which is shown in cutaway).
  • the two inserts occupy approximately 60% of the empty space inside the tubular casing 1, and the compartment 5 occupy the remaining 40%.
  • the inserts 2a, 2b each have two passages 11 which are arranged in the extension of the two passages of the other insert, so as to allow the two rods 3 which are inserted in a central link to pass through the two inserts.
  • the ends of the pins 3 have longitudinal ridges which are designed to be forced out into blind holes in the lateral links 4a, 4b. It will be noted that two pins 3 which pass through the same central link are each forced into two side links 4a and two different side links 4b, so as to form the chain of the bracelet.
  • the ends of the rods could be made integral with the side links in another way. The rods could for example be welded or glued, or else be threaded and screwed into tapped holes in the side links.
  • the figures 2A and 2B are two partial cross-sectional views, vertical and horizontal respectively, which show the same assembly consisting of a central link, two pins 3a, 3b and two lateral links 4a, 4b of the bracelet of the figure 1 ; the central link being articulated on one of the two pins (referenced 3a), and the two pins each being fixed by their two ends to the two lateral links 4a, 4b.
  • the central link is formed by a tubular envelope 1 and two inserts 2a and 2b.
  • the two passages 11 formed in each of the inserts 2a, 2b consist of two profiled and through holes which are parallel to one another.
  • the figure 3 further shows that the cross sectional profile of the two passages is oblong shaped. It can also be seen that the two oblongs are turned so that their longitudinal axis coincides with a horizontal axis AA which connects the centers of the two pins 3 which pass through the inserts 2a, 2b ( figure 2A and 3 ).
  • the figures 2B and 2B show a situation in which the pin 3a is resting against the inner wall of one of the two passages 11, at the level of the zone (referenced 15a) of this wall, which is the closest to the other passage 11.
  • the insert 2a has two bearing surfaces 15a, 15b arranged between the passages 11 and oriented back to back.
  • the two bearing surfaces are provided as stops for the two pins which pass through the inserts 2a, 2b (only one of these pins (referenced 3a) being shown in the figures 2A and 2B ).
  • the presence of the two bearing surfaces 15 makes it possible to maintain the two pins 3 which pass through the same central link at least a minimum distance from each other.
  • the bearing surfaces 15 are each formed by the portion of the edge of a passage 11 which is closest to the other passage 11.
  • each pin thus has the possibility of pivoting. axially on itself inside the central link which it passes through, so that the assembly formed by the pin and the two passages 11 which it passes through to enter and to emerge from a central link, constitutes a kind hinge arranged to fulfill an articulation function between a central link and a pair of side links 2a, 2b of the bracelet. It will be understood on the other hand that due to the oblong shape of the profile of each passage 11, the pins 3 also have the possibility of ripping with greasy friction, inside the passages, in the longitudinal direction of the bracelet.
  • this characteristic gives the possibility of varying the distance separating the two pins 3 between a minimum distance which corresponds to a situation where the two pins are respectively in abutment against the bearing surfaces 15a and 15b, and a maximum distance which corresponds to a contrary situation (not shown), where the two pins abut respectively against the parts (respectively referenced 13a and 13b) of the walls of the two passages 11 which are located opposite the bearing surfaces 15a, 15b.
  • the difference between the minimum value and the maximum value of the distance between the two pins 3 could be about 0.6mm.
  • each pin 3 has the possibility of ripping transversely over a distance of 0.3mm inside the passage 11 in which it is inserted.
  • the two passages 11 which pass through an insert (2a or 2b) have the same dimensions and the same profile.
  • the profiles of the two passages could be different.
  • the passages could be shaped so that only one of the two pins has the possibility of ripping parallel to the longitudinal axis of the bracelet. The other pin would then be inserted into a passage having a circular profile and the diameter of which would be adjusted to that of the pin. This second pin would therefore have the possibility of pivoting axially on itself, but would not have the possibility of ripping transversely.
  • each of the two pins 3 on which a central link is articulated is biased, by an elastic element, against one of the two bearing surfaces 15a, 15b of the insert which closes one side of the tubular casing 1 of said central link.
  • each of the two sides of the tubular envelope is closed by insert, and each central link of the bracelet contains a compartment 5 which is arranged in the middle part of the tubular envelope 1 between the two inserts 2a, 2b .
  • the compartment 5 is designed to serve as a housing for at least one elastic element arranged to urge at least one of the two pins 3, in the direction of the other pin.
  • the figure 4 is a perspective view of a tension spring 17, which constitutes a first variant of said at least one elastic element adapted to be housed in the tubular casing 1 of each of the central links of the bracelet.
  • the general outer shape of the tension spring 17 is that of a rectangular parallelepiped, the dimensions of which are chosen so as to allow it to be housed in the compartment 5 inside a central link.
  • the spring 17 illustrated is a tension spring and its two ends are arranged to be hooked to the two pins 3 which pass through the central link. To this end, the ends of the spring 17 each comprise a cylindrical passage (respectively referenced 19a and 19b) in which is inserted one of the two pins 3.
  • the cylindrical passages 19a and 19b are oriented parallel to the two large faces (the lower face and the upper face of the rectangular parallelepiped formed by the spring), and also oriented parallel to the two small faces (the two opposite ends of the rectangular parallelepiped).
  • the tension spring 17 comprises an elastic part 21, in the form of rectangular coil, which is interposed between the two cylindrical passages 19a, 19b.
  • the spring 17 and its coil can for example be made from a section of rectangular profile.
  • the elastic element of the invention could not be constituted by a spring, or even by several springs.
  • the elastic element could be constituted by an elastomeric tape in the form of a loop (in other words an “elastic”), the loop of which would be arranged to elastically link the two pins. which cross a central link.
  • FIGS. 2A and 2B show in particular that the width of the spring 17 is adapted to that of the compartment 5 so that the tension spring occupies substantially the entire width available between the two inserts 2a, 2b.
  • the compartment 5 is appreciably longer than the spring 17, so that the spring is free to lengthen when the two pins 3 to which it is attached move away from one another.
  • the non-cylindrical shape of the passages 11 gives the possibility for the two pins 3 to move apart by approximately 0.6mm when they pass from the situation illustrated, in which they abut against the bearing surfaces 15a and 15b, in the reverse situation in which they abut against the parts 13a and 13b of the walls of the two passages 11 which are located opposite the bearing surfaces 15a, 15b.
  • the greatest length of the non-circular profile of the passages 11 is chosen so as to prevent any excessive and therefore plastic deformation of the spring 17. It will also be understood that, in the case of a bracelet comprising 10 links equipped with springs, the maximum possible displacement is 6mm, which is approximately 3.5% of the perimeter.
  • the tension spring 17 is prestressed. In other words, it is dimensioned so that, in the absence of constraints, its length is appreciably less than the minimum distance which separates the pins 3 hooked to both ends of the spring.
  • the spring 17 is sufficiently pre-stressed to return the two pins 3 against the bearing surfaces 15 with a force at least equal to half the total weight of the wristwatch.
  • the tensile force exerted by gravity on the links of a bracelet, when it is suspended by its clasp is equal to half of the total weight of the wristwatch.
  • a wristwatch with a total mass of 123 grams is pulled down with a force of 1.2 Newton, and the force to which each central link is subjected is 0.6 Newton.
  • the figure 5 is a perspective view of a double compression spring 67 which constitutes a second variant of said at least one elastic element adapted to be housed in the tubular casing 1 of each of the central links of the bracelet which is the subject of the present description.
  • the figure 6 is a vertical sectional view illustrating the arrangement of the spring 67 inside the tubular casing 1 of one of the central links of the bracelet.
  • the spring 67 is formed from a single rectangular flexible sheet of which two opposite ends have been plastically deformed so as to return them each by approximately 270 ° on itself. As shown in the figure 6 , the two curved ends of the spring 67 are adapted to serve as contact surfaces (referenced 69a and 69b) for the two pins 3 on which the central link is articulated. The figure also shows that the spring 67 is dimensioned so as to adjust, over almost its entire length, to the contours of the rigid inner wall of the tubular casing 1. Only the ends constituting the two contact surfaces 69a, 69b of the spring emerge from the inner wall, and it will be understood that these ends are the only parts of the spring which have the possibility to flex elastically under stress.
  • the length of the spring 67 does not change when it is subjected to a stress, but its two curved ends each have the possibility of deforming elastically when they are pushed back by a pin 3 in the direction of a portion of the wall of the cylindrical element 1 against which the curved end in question rests.
  • the two curved ends of the spring 67 behave like two compression springs each arranged so as to urge one of the pins 3 in the direction of the corresponding bearing surface 15a, 15b. This is the reason why the spring 67 is referred to as a "double compression spring".

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  • Adornments (AREA)
EP19177095.7A 2019-05-28 2019-05-28 Elastisches armband mit gliedern Active EP3744209B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19177095.7A EP3744209B1 (de) 2019-05-28 2019-05-28 Elastisches armband mit gliedern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19177095.7A EP3744209B1 (de) 2019-05-28 2019-05-28 Elastisches armband mit gliedern

Publications (2)

Publication Number Publication Date
EP3744209A1 true EP3744209A1 (de) 2020-12-02
EP3744209B1 EP3744209B1 (de) 2021-10-13

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ID=66676265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19177095.7A Active EP3744209B1 (de) 2019-05-28 2019-05-28 Elastisches armband mit gliedern

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EP (1) EP3744209B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4154752A1 (de) 2021-09-24 2023-03-29 Roventa-Henex SA Erweiterbare komfortlasche

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB349530A (en) * 1929-05-02 1931-05-21 Emrich G M B H I An improved expanding bracelet
US2591778A (en) * 1949-01-18 1952-04-08 Frederich L Brecht Expansible bracelet
CH648818A5 (de) 1980-10-29 1985-04-15 Merck Patent Gmbh Fluessigkristalline cyclohexylphenylderivate.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB349530A (en) * 1929-05-02 1931-05-21 Emrich G M B H I An improved expanding bracelet
US2591778A (en) * 1949-01-18 1952-04-08 Frederich L Brecht Expansible bracelet
CH648818A5 (de) 1980-10-29 1985-04-15 Merck Patent Gmbh Fluessigkristalline cyclohexylphenylderivate.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4154752A1 (de) 2021-09-24 2023-03-29 Roventa-Henex SA Erweiterbare komfortlasche

Also Published As

Publication number Publication date
EP3744209B1 (de) 2021-10-13

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