EP3835888A1 - Tool and method for removing a watch glass - Google Patents

Abstract

The present invention relates to a tool (1) for the removal of a lens (22) mounted in an initially waterproof watch case (2) by elastic engagement in a housing of the bezel forming a glass notch, comprising: - a first fitting (3) intended to be positioned on the top of the case with a stop on the external face of the bezel, in front of the lens (22), having essentially the shape of a ring with a square section with a cylindrical recess (30) capable of containing the glass (22) once removed from the bezel; - a second fitting (4) provided with a thread allowing it to be screwed onto the case (2) in place of a bottom cover of the watch, and provided in its center with a through hole (18) to allow the passage of compressed air inside the housing (2); and- a third fitting (5) having the shape of a solid cylinder intended to be inserted inside the first fitting (3) until it touches the glass (22).

Description

Object of the invention

The present invention relates to a tool for removing watch glasses (or glasses) by injecting pressurized air inside the case, in the case where the glasses are embedded in a metal ring or in the bezel.

The invention also relates to the method for using the tool.

State of the art

Monocoque watch cases or in which at least the middle part and the bezel form a single part on which the crystal is fixed by elastic clamping are of interest in particular in terms of sealing due to the reduction in the number of gaskets.

However, it can be difficult to disassemble the boxes nested from the top of the watch whether it is for dust removal at T2 (finishing workshop) or in service centers (CS).

Several types of tools have however been used for opening the housing or removing and removing ice in housings of this type.

In cases where the lens protrudes from the caseband, a first type of tool has been implemented which consists of a split elastic ring which exerts radial pressure on the lens by closing on the cylindrical part of the lens. using pliers with two handles ( CH 290787 ). The free ends of the ring can be articulated respectively to one of the two handles and to a link articulated itself to this handle, so that, when the handles are brought together, the ring is closed directly on the glass, the elastic reaction of the latter maintaining the movable handle in its closed position ( CH 353693 ). A second type of tool has been used for the same purpose which comprises a tool head comprising a split core and a multitude of jaws or dogs mounted on springs, arranged in a circle and each pivoting about an axis perpendicular to the housing axis, as well as a cap and a tightening tie rod.

All the jaws can be actuated together and if they rest on a flexible material core located in a housing located in the base of the capsule, they can even be used to arch lenses even of non-circular shape ( CH 640388 ).

Just like the simple use of a blade between the edge of the glass and the edge of the housing acting as an ice notch, the aforementioned tools have the particularity of risking damage such as crumbling of the edge of the glass or of causing damage to the housing.

Another type of solution is based on the principle of increasing the air pressure prevailing inside the case to a value such that the glass can come out of its housing. This pressure increase is generally carried out using a pump external to the housing, preferably fitted with a pressure gauge and connected, for example, by means of a flexible pipe to any opening in the housing.

This method generally applies to one-piece cases and the opening of choice is of course the opening of the crown, once the latter and the sealing means have been removed ( CH 376437 ).

However, it has been found that considerable pressure, sometimes up to 8 bar, must be applied to loosen the ice from the housing.

There is therefore a risk that, when the glass seal finally fails, the pressure accumulated inside the housing will be released all at once, without possible control by the operator.

A kind of explosion ensues which causes a violent current of air through the box. This phenomenon risks deforming the dials, loosening the hands or even damaging the automatic movements, for example by expelling the oil from the bearings thereof or by distorting the balance spring.

A solution to this problem is provided in the document CH 682200 which teaches a method for opening the watch case by extracting the glass, this case is fixed in an enclosure, after having removed its crown and its stem. A suction cup is then applied to the glass, this suction cup being able to be actuated from outside the enclosure using a handle. Using a pump operated by a lever, the enclosure is subjected to a defined overpressure, after which a tensile force is exerted on the suction cup until the glass is extracted. Since the overpressure is the same outside and inside the case, no air displacement, and therefore no damage to the watch mechanism, occurs when the glass is separated from the case.

However, this solution requires complex and potentially expensive equipment.

Aims of the invention

The present invention aims to provide a simple and inexpensive solution for the removal of watch glasses in which an air flow is injected into the case without sudden release of pressure leading to undesirable effects such as deformation of the dials, detachment of the hands. or flushing the oil from the bearings of automatic movements.

Main characteristic elements of the invention

A first aspect of the present invention relates to a first tool and a corresponding method for depositing a glass mounted in an initially waterproof watch case by resilient engagement in a housing of the bezel forming a glass notch.

• un premier posage destiné à se positionner sur le haut du boîtier à butée sur la face externe de la lunette, en face du verre, ayant essentiellement la forme d'un anneau à section carrée avec un renfoncement cylindrique 30 apte à contenir le verre une fois déchassé de la lunette ;
• un deuxième posage muni d'un filetage lui permettant d'être vissé sur le boîtier à la place d'un couvercle de fond de la montre, et pourvu en son centre d'un trou passant pour permettre le passage d'air comprimé à l'intérieur du boîtier ;
• un troisième posage ayant la forme d'un cylindre plein destiné à venir s'insérer à l'intérieur du premier posage jusqu'à toucher le verre ;
• une pièce de support axial de l'assemblage du boîtier de montre et desdits posages comprenant un socle, un premier point de support axial dudit assemblage situé en utilisation du côté du fond de boîtier et un second point de support axial dudit assemblage situé en utilisation du côté du haut de boîtier, le premier point de support axial et le second point de support axial étant situés dans l'axe de référence du boîtier en utilisation, le premier point de support axial étant situé à l'extrémité d'une première vis et le second point de support axial étant situé à l'extrémité d'une seconde vis, la position des deux vis étant ajustable le long dudit axe de référence par vissage dans le socle, la première vis étant apte à venir à butée contre la surface externe du troisième posage au niveau du premier point de support axial, la seconde vis étant apte à venir à butée contre le deuxième posage en regard du trou passant et étant creuse en son centre pour permettre le passage d'air comprimé, la seconde vis étant pourvue d'une tête au niveau de sa partie distale du support, munie d'un raccord pour raccorder un tuyau flexible relié à une pompe ou raccorder directement une pompe ;
• optionnellement un tuyau flexible reliée à la pompe par un raccord ;
• une pompe.

The first tooling comprises at least the following elements:

• a first fitting intended to be positioned on the top of the case with a stop on the external face of the bezel, in front of the glass, essentially having the shape of a ring with a square section with a cylindrical recess 30 capable of containing the glass once released from the telescope;
• a second fitting provided with a thread allowing it to be screwed onto the case in place of a back cover of the watch, and provided in its center with a through hole to allow the passage of compressed air to the inside the housing;
• a third fixture in the form of a solid cylinder intended to be inserted inside the first fixture until it touches the glass;
• an axial support part of the assembly of the watch case and of said fixings comprising a base, a first point of axial support of said assembly located in use on the side of the case back and a second point of axial support of said assembly located in use of the side of the top of the housing, the first point of axial support and the second point of axial support being located in the reference axis of the housing in use, the first point of axial support being located at the end of a first screw and the second axial support point being located at the end of a second screw, the position of the two screws being adjustable along said reference axis by screwing into the base, the first screw being able to come into abutment against the external surface of the third installation at the level of the first axial support point, the second screw being able to come into abutment against the second installation facing the through hole and being hollow in its center to allow the passage of compressed air, the second screw being provided with a head at the level of its distal part of the support, provided with a connector for connecting a flexible pipe connected to a pump or directly connecting a pump;
• optionally a flexible pipe connected to the pump by a fitting;
• a pump.

• le socle de la pièce de support axial est une pièce en forme de « U » avec un bras axial reliant deux bras transversaux dans lesquels peuvent être vissés respectivement la première vis et la seconde vis ;
• la tête de la seconde vis est également munie d'une mollette et d'une vanne d'arrêt ;
• la pompe est une pompe à piston et est munie d'un manomètre ;
• les posages sont en métal ou matière plastique.

According to particular embodiments, the first tool further comprises at least one of the following characteristics or an appropriate combination of several of them:

• the base of the axial support piece is a "U" shaped piece with an axial arm connecting two transverse arms into which the first screw and the second screw can be screwed respectively;
• the head of the second screw is also provided with a thumbwheel and a stop valve;
• the pump is a piston pump and is fitted with a pressure gauge;
• the fixtures are made of metal or plastic.

• on dévisse le couvercle de fond d'un boîtier de montre étanche dans lequel le verre est monté par engagement élastique dans un logement de la lunette formant cran de glace ;
• le deuxième posage est vissé en lieu et place du couvercle du boîtier ;
• le premier posage est placé sur le la face externe de la lunette ;
• le troisième posage est inséré à l'intérieur du premier posage et l'ensemble constitué par le boîtier, le premier, le deuxième et le troisième posage est amené à butée de la première vis de maintien, elle-même vissée au travers du socle de support ;
• la seconde vis de maintien est vissée au travers du socle de support à butée contre le deuxième posage ;
• la pompe est montée éventuellement via un flexible sur la tête de la seconde vis au moyen du (ou des) connecteur(s) et la vanne d'arrêt est ouverte ;
• l'intérieur étanche du boîtier de montre est mis sous pression jusqu'à obtention d'une valeur de pression désirée lue sur un manomètre de la pompe ;
• la vanne d'arrêt est fermée et la pompe et le flexible éventuel sont retirés ;
• la première vis de maintien est dévissée lentement, le verre se déchassant sous l'effet de la pression régnant dans le boîtier, et occupant l'espace pourvu à cet effet dans le premier posage ;
• la pression d'air s'évacue lentement ;
• sous la pression du verre, le troisième posage suit la vis jusqu'à affleurer la surface externe du premier posage ;
• l'ensemble du dispositif est ensuite démonté.

The corresponding method of implementation is sequentially characterized by the following steps:

• unscrewing the bottom cover of a waterproof watch case in which the glass is mounted by elastic engagement in a housing of the bezel forming a glass notch;
• the second fitting is screwed in place of the housing cover;
• the first fitting is placed on the outer face of the bezel;
• the third fitting is inserted inside the first fitting and the assembly consisting of the box, the first, the second and the third fitting is brought to abutment of the first retaining screw, itself screwed through the base of support;
• the second retaining screw is screwed through the support base to stop against the second set;
• the pump is optionally mounted via a flexible on the head of the second screw by means of the connector (s) and the shut-off valve is open;
• the sealed interior of the watch case is pressurized until a desired pressure value is obtained, read on a pressure gauge of the pump;
• the shut-off valve is closed and the pump and any hose are removed;
• the first retaining screw is slowly unscrewed, the glass being released under the effect of the pressure prevailing in the housing, and occupying the space provided for this purpose in the first installation;
• the air pressure is released slowly;
• under the pressure of the glass, the third installation follows the screw until it is flush with the external surface of the first installation;
• the entire device is then dismantled.

A second aspect of the present invention relates to a second tool and a corresponding method for depositing a glass mounted in an initially waterproof watch case by resilient engagement in a housing of the bezel forming a glass notch.

• un premier posage destiné à se positionner sur le haut du boîtier à butée sur la face externe de la lunette, en face du verre, ayant essentiellement la forme d'un anneau à section carrée avec un renfoncement cylindrique 30 apte à contenir le verre une fois déchassé de la lunette ;
• un deuxième posage muni d'un filetage lui permettant d'être vissé sur le boîtier à la place d'un couvercle de fond de la montre, et pourvu en son centre d'un trou passant pour permettre le passage d'air comprimé à l'intérieur du boîtier ;
• un troisième posage ayant la forme d'un cylindre plein destiné à venir s'insérer à l'intérieur du premier posage jusqu'à toucher le verre, une goupille de retenue étant apte à solidariser l'ensemble des premier et troisième posages, avec un mouvement relatif de translation limité ;
• une pièce de support axial de l'assemblage du boîtier de montre et desdits posages comprenant un socle en « U », une première surface de support axial dudit assemblage situé en utilisation du côté du haut de boîtier et une seconde surface de support axial dudit assemblage situé en utilisation du côté du fond de boîtier, la première surface de support axial et la seconde surface de support axial étant situées dans l'axe de référence du boîtier en utilisation, la première surface de support axial étant constituée par un plat formant la surface supérieure du troisième posage et destiné à venir en contact avec l'extrémité proximale d'un piston axial et la seconde surface de support axial étant constituée d'un fond plat usiné dans la branche transversale inférieure du support en « U », constituant une butée pour la surface inférieure du deuxième posage, la position du plat de premier support axial étant ajustable le long dudit axe de référence par le déplacement du piston axial, un canal destiné, d'une part à la connexion avec une alimentation externe en air comprimé et d'autre part à la connexion avec le trou passant du deuxième posage, étant usiné dans la branche transversale inférieure du socle en « U » ;
• un cylindre fileté apte à être vissé et dévissé dans la branche transversale supérieure du support en « U », solidaire d'une autre partie cylindrique dont le centre est destiné à accueillir le piston précité et un ressort de rappel du piston, la surface supérieure de l'autre partie cylindrique étant munie d'un orifice fileté permettant d'y visser l'axe d'une poignée rotative de manière à se trouver à butée avec l'extrémité distale du piston ;
• la poignée rotative ;
• une alimentation externe en air comprimé connectable audit canal.

The second tool comprises at least the following elements:

• a first fitting intended to be positioned on the top of the case with a stop on the external face of the bezel, in front of the glass, essentially having the shape of a ring with a square section with a cylindrical recess 30 capable of containing the glass once released from the telescope;
• a second fitting provided with a thread allowing it to be screwed onto the case in place of a back cover of the watch, and provided in its center with a through hole to allow the passage of compressed air to the inside the housing;
• a third fitting having the form of a solid cylinder intended to be inserted inside the first fitting until it touches the glass, a retaining pin being able to secure all of the first and third fittings, with a limited relative translational movement;
• an axial support part of the watch case assembly and said fixings comprising a "U" base, a first axial support surface of said assembly located in use on the top side of the case and a second axial support surface of said assembly located in use on the housing bottom side, the first axial support surface and the second axial support surface being located in the reference axis of the housing in use, the first axial support surface being formed by a flat forming the surface upper of the third set and intended to come into contact with the proximal end of an axial piston and the second axial support surface consisting of a flat bottom machined in the lower transverse branch of the "U" support, constituting a stop for the lower surface of the second set, the position of the first axial support plate being adjustable along said reference axis by displacement of the axial piston, a channel intended, on the one hand for the connection with an external compressed air supply and on the other hand for the connection with the through hole of the second fitting, being machined in the lower transverse branch of the "U-shaped" base ";
• a threaded cylinder capable of being screwed and unscrewed in the upper transverse branch of the "U" support, integral with another cylindrical part whose center is intended to accommodate the aforementioned piston and a piston return spring, the upper surface of the other cylindrical part being provided with a threaded orifice allowing the axis of a rotary handle to be screwed thereon so as to be in abutment with the distal end of the piston;
• the rotary handle;
• an external compressed air supply connectable to said channel.

• on dévisse le couvercle de fond d'un boîtier de montre étanche dans lequel le verre est monté par engagement élastique dans un logement de la lunette formant cran de glace ;
• le deuxième posage est placé sur la branche transversale inférieure du support en « U » et vissé sur le boîtier en lieu et place du couvercle ;
• le troisième posage est inséré à l'intérieur du premier posage et l'ensemble est solidarisé par la goupille de retenue, procurant un mouvement relatif de translation limité ;
• l'ensemble constitué par le cylindre fileté, l'autre partie cylindrique et le piston avec son ressort de rappel est vissé dans la branche transversale supérieure du support en « U » jusqu'à ce que le premier posage se trouve à proximité de la carrure du boîtier ;
• la poignée rotative est vissée dans l'orifice fileté de l'autre partie cylindrique jusqu'à ce que son axe vienne à butée de l'extrémité distale du piston ;
• on continue à tourner la poignée rotative dans le sens des aiguilles d'une montre de manière à faire coulisser axialement le piston dans le cylindre jusqu'à ce que le piston pousse sur le plat du troisième posage, qui alors coulisse dans le premier posage et vient à butée sur le verre ;
• l'intérieur étanche du boîtier de montre est mis sous pression jusqu'à obtention d'une valeur de pression désirée ;
• le piston est remonté dans le cylindre en tournant la poignée dans le sens contraire des aiguilles d'une montre, grâce à l'action du ressort de rappel ;
• le troisième posage remonte en même temps que le piston sous l'effet de la pression, le verre se déchasse de la carrure et l'air en surpression s'échappe de l'outillage ;
• on dévisse l'ensemble constitué par le cylindre fileté et l'autre partie cylindrique et on extrait le verre de l'outillage.

The corresponding method of implementation is sequentially characterized by the following steps:

• unscrewing the bottom cover of a waterproof watch case in which the glass is mounted by elastic engagement in a housing of the bezel forming a glass notch;
• the second fitting is placed on the lower transverse branch of the "U" support and screwed onto the housing instead of the cover;
• the third set is inserted inside the first set and the assembly is secured by the retaining pin, providing a limited relative translational movement;
• the assembly consisting of the threaded cylinder, the other cylindrical part and the piston with its return spring is screwed into the upper transverse branch of the "U" support until that the first fitting is located near the middle part of the case;
• the rotary handle is screwed into the threaded orifice of the other cylindrical part until its axis abuts the distal end of the piston;
• we continue to turn the rotary handle clockwise so as to slide the piston axially in the cylinder until the piston pushes on the flat of the third setting, which then slides into the first setting and abuts the glass;
• the waterproof interior of the watch case is pressurized until a desired pressure value is obtained;
• the piston is reassembled in the cylinder by turning the handle anti-clockwise, thanks to the action of the return spring;
• the third installation goes up at the same time as the piston under the effect of the pressure, the glass is released from the middle part and the air in excess pressure escapes from the tool;
• the assembly consisting of the threaded cylinder and the other cylindrical part is unscrewed and the glass is extracted from the tool.

Brief description of the figures

• The figure 1 shows an overall sectional view of a first embodiment of a complete tool according to the present invention, for removing a watch glass from its case upwards, comprising a support for the case and its fixings, a piston pump fitted with a pressure gauge, a hose and a valve.
• The figure 2 shows a sectional view of the watch case held in place by the three positions of the tool according to the present invention.
• The figures 3A to 3E illustrate the implementation of the tool according to figure 1 or 2 from the installation of the fixtures to the final removal of the watch crystal.
• The figure 4 shows an overall view of a second embodiment of a complete tool according to the present invention, for lifting a watch glass from its case upwards.
• The figure 5 shows a sectional view of the tooling shown in figure 4 .
• The figures 6A to 6G illustrate the implementation of the tool according to figure 4 from the installation of the fixtures to the final removal of the watch crystal.

Description of preferred embodiments of the invention

The figure 1 shows a first embodiment of a complete tool 1 according to the invention. This comprises an axial support 10 for the watch case 2 and its positions 3, 4, 5, this axial support 10 being for example in the form of a "U" -shaped part comprising a first point or a first surface of axial support 11 and a second point or a second axial support surface 12. The first point and the second axial support point 11, 12 are made adjustable along the reference axis 100, for example by being in the form of ends respective screws 13, 14 which can be adjusted in the two lateral branches of the "U" support. One of the two screws 14 is hollow in its center to allow the passage of compressed air and is terminated at its distal part of the "U" -shaped support by a head 15 provided with a thumbwheel, as well as a valve 16 and having a first connector 17 for flexible pipe 6. In use, the flexible pipe is attached at a first end to the connector 17 integral with the screw head 15 and at a second end to a pump 7 by a second connector 17 '. The pump 7 is for example a piston pump provided with a pressure gauge 19.

The figure 2 shows a sectional view of the watch case 2 and fixtures 3, 4, 5. The fixtures are supports allowing the assembly of a watch. They are made of any suitable material, preferably metal or plastic. On the figure 2 , there is shown the middle part / bezel of the watch 21, the glass 22 in place in the case and the crown 23 with its sealing system. The automatic movement has not been shown.

A first fitting 3 is firstly arranged on the top of the case, coming into abutment on the bezel and in front of the glass 22. The fitting 3 has essentially the shape of a ring with a square section but is provided, on the case side, a recess 30 intended to accommodate the glass once released. Its function is to hold the top of the watch. A second fitting 4 is screwed in place of the bottom cover, previously removed from the housing. Its function is to hold the bottom of the watch and to seal the case. The second fitting 4 is provided with a through hole 18 intended to come opposite the hollow screw 14 and the passage of compressed air therethrough. The third fitting 5 has the shape of a solid cylinder which is inserted into the first fitting 3. The third fitting 5 comes into contact with the glass 22 and is held in this position by the screw 13, located at the first point of axial support. 11, through the "U" support piece 10.

The method of implementing the tool 1 according to the invention is illustrated on the figures 3A to 3E . The first fitting 3 is placed on the bezel or the flange of the case from which the back cover has been previously removed ( figure 3A ) and the second fitting 4 is screwed in place of the cover ( figure 3B ). The screw 13 is fitted in the "U" bracket 10 so as to push the third fixture 5, inserted in the first fixture 3, against the glass 22 ( figure 3C ). The hollow screw 14 is pressed on the second fitting 4 with the interposition of a seal 14a opposite the through hole 18 provided in the second fitting 4 (shown in figure 1 ). The pump 7 is mounted with its flexible on the head 15 of the screw 14 by means of the connector 17, with the valve 16 open. The inside of the watch case is pressurized until the desired pressure is obtained, read on the manometer 19 of the pump 7 ( 3d figure ). Valve 16 is then closed. The retaining screw 13, located opposite the screw 14 with respect to the housing, is slowly unscrewed. Under the effect of the pressure prevailing in the housing, the glass 22 loosens and occupies the space 30 provided for this purpose in the first installation 3. The air pressure is released gently. Under the pressure of the glass, the third installation 5 rises and follows the screw 13 until it is flush with the external surface of the first installation 3 ( figure 3E ). The glass is still held by the screw 13. The entire device can then be dismantled.

The figures 4 and 5 show a second embodiment of a complete tool 1 according to the invention. This comprises an axial support 10 for the watch case 2 and its positions 3, 4, 5, this axial support 10 also being in the form of a "U" -shaped part comprising a first point or a first support surface. axial 11 and a second point or a second axial support surface 12. The positions 3, 4 and 5 are identical or similar to those of the first embodiment described above. At least one of the points or axial support surfaces 11, 12 is made adjustable along the reference axis 100. In this example, the axial support surface 12 is fixed and consists of a flat bottom machined in the lower transverse branch 101. of the "U" -shaped support 10 and intended to receive the second installation 4. The axial support surface 11 is constituted by a flat 41 forming the upper surface of the third installation 5, in contact with the lower end of the piston 43 of axial piston mechanism 40. Piston 43 is positioned axially by screwing / unscrewing, as described below.

A channel 45 is machined in the lower transverse part of the "U" support 10. Appropriate connectors 46 respectively allow the channel 45 to join with the threaded pass-through hole 18 provided in the second fitting 4 and with a source of compressed air, known per se to those skilled in the art.

Firstly ( figure 6A ), the receptacle of the watch case 2 is opened by separating the positions 3 and 4 by unscrewing a threaded cylinder 50 through the upper transverse part of the "U" support 10. The threaded cylinder 50 is integral with a another cylindrical part 51, the center of which is intended to accommodate the aforementioned piston 43 and a return spring 44. The upper surface of part 51 is provided with a threaded orifice 53 allowing the axis of a handle 52 to be screwed therein. The upper part of the piston 43 is at this moment in abutment in the cylindrical part 51 thanks to the action of the return spring 44. After screwing into the threaded hole 53, the axis of the handle 52 can then be positioned at stop with the upper part of the piston 43.

Once the receptacle has been released, the bottomless watch case 2 is placed on the lower position (or second position) 4 ( figure 6B ). The first and third positions 3, 5 are then brought closer to the housing by screwing, by manual rotation of the part 51, the threaded cylinder 50 in the upper transverse part 102 of the "U" support 10 until the first installation 3 integral with the threaded cylinder 50 abuts against the middle part 21 of the watch case 2 ( figure 6C ). Then, the handle 52 is turned clockwise so as to slide the piston axially in the cylinder 50. The piston 43 pushes on the flat 41, which brings down the third set 5 until that it comes to a stop on the ice 22 ( figure 6D ).

A source of compressed air is then connected to the housing 2 via the external connector 46 and the channel 45 ( figure 6E ).

The piston 43 is reassembled in the cylinder 50 by turning the handle 52 counterclockwise, thanks to the action of the spring return 44. The third fitting 5 rises at the same time as the piston 43 and under the effect of the air pressure, the lens 22 is released from the caseband 21 and the overpressurized air escapes from the tool. ( figure 6F ).

It only remains to unscrew the cylinder 51 to reassemble the cylinder 50, open the receptacle of the housing and extract the glass 22 from the tool ( figure 6G ).

List of reference symbols

1

tools

2

watch case

3

first exposure

4

second installation

5

third setting

6

a flexible pipe

7

pump

10

plinth ("U" bracket)

11

first axial support point

12

second axial support point

13

first screw

14

second screw (hollow)

15

screw head with wheel

16

valve

17, 17 '

connection

18

pass-through hole (possibly with thread)

19

manometer

21

caseband and bezel

22

glass

23

crowned

30

cylindrical recess (first installation)

40

piston mechanism

41

flat (upper surface of the 3 ^rd WCS)

42

retaining pin

43

piston

44

spring

45

channel for compressed air supply

46

connector

50

threaded cylinder

51

other cylindrical part

52

rotary handle

53

threaded hole

100

work axis (box)

101

lower transverse branch of the "U" bracket

102

lower transverse branch of the "U" bracket

Claims (8)

Tool (1) for removing a lens (22) mounted in an initially waterproof watch case (2) by elastic engagement in a housing of the bezel forming the crystal notch, comprising at least the following elements: - a first fitting (3) intended to be positioned on the top of the case to stop on the external face of the bezel, in front of the glass (22), having essentially the shape of a ring with a square section with a cylindrical recess ( 30) capable of containing the lens (22) once released from the bezel; - a second fitting (4) provided with a thread allowing it to be screwed onto the case (2) in place of a back cover of the watch, and provided in its center with a through hole (18) to allow the passage of compressed air inside the housing (2); - a third fitting (5) having the shape of a solid cylinder intended to be inserted inside the first fitting (3) until it touches the glass (22); - a part for axial support of the assembly of the watch case (2) and of said fixings (3, 4, 5) comprising a base (10), a first point of axial support (11) of said assembly located in use on the side bottom of the housing and a second point of axial support (12) of said assembly located in use on the side of the top of the housing, the first point of axial support (11) and the second point of axial support (12) being located in the reference axis (100) of the housing in use, the first axial support point (11) being located at the end of a first screw (13) and the second axial support point (12) being located at the end a second screw (14), the position of the two screws (13, 14) being adjustable along said reference axis (100) by screwing into the base (10), the first screw (13) being able to come to rest stop against the surface external of the third installation (5) at the level of the first axial support point (11), the second screw (14) being able to abut against the external surface of the second installation (4) opposite the through hole (18) and being hollow in its center to allow the passage of compressed air, the second screw (14) being provided with a head (15) at its distal part of the support, provided with a connector (17) for connecting a pipe flexible (6) connected to a pump (7) or directly connected to a pump (7); - optionally a flexible pipe (6) connected to the pump by a connector (17 '); - a pump (7). Tool according to Claim 1, characterized in that the base (10) of the axial support part is a "U" -shaped part with an axial arm connecting two transverse arms into which the first screw (13) can be screwed respectively. and the second screw (14). Tool according to Claim 1, characterized in that the head (15) of the second screw (14) is also provided with a knob and a stop valve (16). Tool according to Claim 1, characterized in that the pump (7) is a piston pump and is provided with a pressure gauge (19). Tool according to Claim 1, characterized in that the fixings (3, 4, 5) are made of metal or plastic. Method of using the tool (1) according to any one of the preceding claims, characterized in that , sequentially: - Unscrewing the bottom cover of a waterproof watch case (2) in which the glass is mounted by elastic engagement in a housing of the bezel forming a notch of ice; - the second fitting (4) is screwed in place of the housing cover; - the first fitting (3) is placed on the outer face of the bezel; - the third fitting (5) is inserted inside the first fitting (3) and the assembly consisting of the housing (2), the first, the second and the third fitting (3, 4, 5) is brought to abutment of the first retaining screw (13), itself screwed through the support base (10); - the second retaining screw (14) is screwed through the support base (10) in abutment against the second fitting (4); - the pump (7) is optionally mounted via a flexible (6) on the head (15) of the second screw (14) by means of the connector (s) 17 (, 17 ') and the valve stop (16) is open; - The sealed interior of the watch case is pressurized until a desired pressure value is obtained, read on a pressure gauge (19) of the pump (7); - the stop valve (16) is closed and the pump (7) and any hose (6) are withdrawn; - the first retaining screw (13) is slowly unscrewed, the glass (22) being released under the effect of the pressure prevailing in the housing, and occupying the space (30) provided for this purpose in the first installation (3 ); - the air pressure is released slowly; - Under the pressure of the glass, the third installation (5) follows the screw (13) until it is flush with the external surface of the first installation; - the entire device is then dismantled. Tool (1) for removing a lens (22) mounted in an initially waterproof watch case (2) by elastic engagement in a housing of the bezel forming the crystal notch, comprising at least the following elements: - a first fitting (3) intended to be positioned on the top of the case to stop on the external face of the bezel, in front of the glass (22), having essentially the shape of a ring with a square section with a cylindrical recess ( 30) capable of containing the lens (22) once released from the bezel; - a second fitting (4) provided with a thread allowing it to be screwed onto the case (2) in place of a back cover of the watch, and provided in its center with a through hole (18) to allow the passage of compressed air inside the housing (2); - a third fitting (5) having the shape of a solid cylinder intended to fit inside the first fitting (3) until it touches the glass (22), a retaining pin (42) being suitable in securing all of the first and third positions (3, 5), with a limited relative translational movement; - an axial support part of the assembly of the watch case (2) and of said fixings (3, 4, 5) comprising a base (10) in "U", a first axial support surface (11) of said assembly located in use on the housing top side and a second axial support surface (12) of said assembly located in use on the housing bottom side, the first axial support surface (11) and the second axial support surface (12) being located in the reference axis (100) of the housing in use, the first axial support surface (11) being constituted by a flat (41) forming the upper surface of the third fitting (5) and intended to come into contact with the 'proximal end of an axial piston (43) and the second supporting surface axial (12) consisting of a flat bottom machined in the lower transverse branch (101) of the "U" support (10), constituting a stop for the lower surface of the second installation (4), the position of the plate (41 ) of the first axial support (11) being adjustable along said reference axis (100) by the movement of the axial piston (43), a channel (45) intended, on the one hand, for connection with an external compressed air supply and on the other hand to the connection with the through hole (18) of the second fitting (4), being machined in the lower transverse branch (101) of the "U" base (10); - a threaded cylinder (50) able to be screwed and unscrewed in the upper transverse branch (102) of the "U" support (10), integral with another cylindrical part (51) whose center is intended to accommodate the piston aforementioned (43) and a return spring (44) of the piston (43), the upper surface of the other cylindrical part (51) being provided with a threaded hole (53) for screwing the axis of a rotary handle (52) so as to abut the distal end of the piston (43); - the rotary handle (52); - an external compressed air supply connectable to said channel (45). Method of using the tool (1) according to claim 7, characterized in that , sequentially: - Unscrewing the bottom cover of a waterproof watch case (2) in which the glass (22) is mounted by elastic engagement in a housing of the bezel forming a glass notch; - the second fitting (4) is placed on the lower transverse branch (101) of the “U” support (10) and screwed onto the housing (2) in place of the cover; - the third fitting (5) is inserted inside the first fitting (3) and the assembly is secured by the retaining pin (42), providing a limited relative translational movement; - the assembly consisting of the threaded cylinder (50), the other cylindrical part (51) and the piston (43) with its return spring (44) is screwed into the upper transverse branch of the "U" support (10 ) until the first fitting (5) is near the middle part (21) of the housing (2); - the rotary handle (52) is screwed into the threaded orifice (53) of the other cylindrical part (51) until its axis abuts the distal end of the piston (43); - we continue to turn the rotary handle (52) clockwise so as to slide the piston (43) axially in the cylinder (50) until the piston (43) pushes on the flat (41) of the third fixture (5), which then slides in the first fixture (3) and abuts on the glass (22); - the sealed interior of the watch case (2) is pressurized until a desired pressure value is obtained; - the piston (43) is reassembled in the cylinder (50) by turning the handle (52) counterclockwise, thanks to the action of the return spring (44); - the third fitting (5) rises at the same time as the piston (43) under the effect of the pressure, the lens (22) is released from the caseband (21) and the overpressurized air escapes from the tools; - The assembly consisting of the threaded cylinder (50) and the other cylindrical part (51) is unscrewed and the glass (22) is extracted from the tool.

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