Abstract: A Dewar device for mechanical and/or functional components of a watch, the device being provided with a bracelet and a casing including an enclosure wherein a case of the watch can be disposed so that a crystal of the case is arranged opposite a crystal of all the elements of the casing defining this enclosure and at least one fastening device fastening the watch case in the enclosure of the casing by keeping it remote from all the elements of the casing defining this enclosure, the Dewar device including a device for actuating at least one push button by rotating a pivoting bezel of the casing.

Abstract: A Dewar device for mechanical and/or functional components of a watch, this device including a wristlet, a case including a chamber wherein a case of the watch is capable of being disposed in such a way that a glass of this case is arranged facing a glass of a set of elements of the case defining this chamber, at least one fastening device fastening this watch case in this chamber of the case while maintaining it distant from all of the elements of the case defining this chamber, and a device for actuating at least one push button by the angular movement of a free end of at least one lever element of this device relative to the case, this at least one lever element having another end movably fastened to this case.

Abstract: A closing/opening system for a case of a timepiece is defined particularly in first and second parts of the case. The system includes a device for producing a mechanical connection, particularly a bayonet connection between these first and second parts and a device for creating a friction torque between these first and second parts. The device for creating a friction torque includes tightening faces to cooperate with one another when closing/opening the case and which are defined in the first and second parts. The system further includes a tightening element in one of these two tightening faces. The tightening element generates a constant friction torque during a course of travel of one of the two parts relative to the other when closing/opening the case of the timepiece.

Abstract: A water-resistant watch case of a diving watch, includes at least one back mounted on a lower side of a middle part, and a crystal mounted on an upper side of the middle part. The crystal includes an annular peripheral surface to be fastened with an amorphous metal gasket on an inner annular surface that is complementary in shape, on the upper side of the middle part. The annular peripheral surface of the crystal is inclined towards the inside of the watch case at a determined angle less than 90° relative to a central axis perpendicular to a plane of the watch case to distribute stresses between the crystal and the middle part due to the water pressure during a dive. The annular peripheral surface and the inner annular surface are conical in shape.

Abstract: An assembly (1) for measuring a relative humidity level inside a watch (2), the watch (2) provided with a movement (10) and a device (4) for determining the humidity level present in the enclosure (9) of a case (3) of this watch (2). The determination device (4) includes a receiver module (6a, 6b, 6c) for receiving at least one acoustic signal from a timepiece component (11) of said movement (10), and a control unit (7) connected to said receiver module (6a, 6b, 6c). The control unit (7) is configured to run a model for evaluating a water vapour content of a gaseous fluid contained inside the enclosure (9) based on the at least one acoustic signal received by the receiver module (6a, 6b, 6c).

Abstract: A water-resistant watch case of a diving watch, includes a back mounted on a lower side of a middle part, and a crystal mounted on an upper side of the middle part. The crystal includes an annular peripheral surface mounted by a first portion of an annular gasket made of amorphous metal on an inner annular surface that is complementary in shape, on the upper side of the middle part. A second portion of the gasket on the first portion of the gasket maintains the crystal against the middle part. The annular peripheral surface of the crystal is inclined towards the inside of the watch case at an angle less than 90° relative to a central axis perpendicular to the plane of the watch case to distribute stresses between the crystal and the middle part due to the water pressure.

Abstract: A rotary bezel equipped timepiece includes a glass frame that holds a windshield member, a rotary bezel so provided as to be rotatable relative to the glass frame, a resin member attached to the outer circumferential surface of the glass frame, and a gasket disposed between the resin member and the inner circumferential surface of the rotary bezel.

Abstract: A timepiece includes a locking device capable of blocking the translation of a valve or of a control member in the position the closest to the central axis of the case. The locking device includes a blocking element capable of undergoing translational displacement along a radial axis between a locking position and an unlocking position, where the member is respectively blocked or free to move in translation, a part mounted such that it can move in rotation about the central axis of the case and intended to be set in rotation by a user, drive device linking the angular displacement of the part mounted such that it can move in rotation to the translational displacement of the blocking element between the locking and unlocking positions.

Abstract: A push button device including a device for adjusting the angular orientation of the push button head with respect to the watch case, wherein the angular orientation adjustment device includes a friction ring disposed concentrically around the central shaft inside the tube, the friction ring rotates integrally with the central shaft and is free in translation with respect to the central shaft, the friction ring includes an external friction surface in friction contact with an internal wall of the tube, and wherein the central shaft includes a device for actuating the latter in rotation, making it possible to pivot the push button against the frictional forces generated by the friction ring, in order to adjust the angular orientation of the push button head.

Abstract: There is disclosed herein a water tight submersible electronic device, such as a dive computer or a dive watch, comprising a case, a bezel, and glass through which a display can be viewed. The glass, case and bezel can all be different materials. The bezel is affixed to the case, in a permanent or removable manner, and has an opening for the glass and an electronic display. The electronic display is positioned under the glass and within the electronic device. For example, the glass is separated from and locked to the bezel by at least a locking ring, a shock absorber and/or a gasket. As such the glass can be free floating so that it and the bezel can deform under pressure without being damaged or causing damage to each other while maintaining a water tight connection.

Abstract: Watch glass (1) including a first element (2) made of a first material and a second element (3) made of a second material different from the first, more elastic than the first material, the second element (3) includes a skirt (3b) in its lower part, and the two elements (2, 3) are fixed to each other so that the first element (2) is oriented toward the exterior of a watch and the skirt of the second element (3) is adapted for the assembly of the watch glass (1) to a watch middle (4).

Abstract: A valve includes a valve seat having a hole configured as a flow path, a valve body configured to open/close the flow path due to relative movement with respect to the valve seat, an opening member having a first surface fixed to one of the valve seat and the valve body, a second surface configured to separate away and abut the other one of the valve seat and the valve body, a third surface which intersects the first and second surfaces, and an opening penetrating the first and second surfaces, a fixing member that fixes the first surface to the one of the valve seat and the valve body, and an inclined portion, which makes an interval between the one of the valve seat and the valve body and the first surface long in a direction from the opening to the third surface.

Abstract: An electronic device and a housing structure thereof are provided. The electronic device includes a transparent member; a metallic housing surrounding a boundary of the transparent member, and forming a lateral outer appearance of the electronic device; and a non-metallic absorption member arranged inside the metallic housing. The non-metallic absorption member is arranged to face a side surface of the transparent member. The metallic housing comprises a protection portion arranged adjacent to the boundary of the transparent member. An interlace between the non-metallic absorption member and the protection portion, which faces the transparent member, is disposed inward relative to a first virtual extension line virtually extending along an external surface of the transparent member. An inner surface of the protection portion facing the non-metallic absorption member includes a surface inclined at a preset angle with respect to a front or rear direction of the electronic device.

Abstract: A device case includes a resin case body having an opening which is disposed on a viewing face of the case body and a step which is disposed on an interior of the opening and protruding further to the interior than an inner face of the opening. The device case further includes a windproof member having an outer diameter smaller than an inner diameter of the opening of the case body and larger than an inner diameter of the step; and an adhesive section bonding and fixing the windproof member at a position to seal the opening of the case body. The adhesive section has higher flexibility than the case body.

Abstract: Portable object comprising a frame arranged to serve as a cradle for a control stem, the actuation in rotation of which makes it possible to control at least one electronic or mechanical function of the portable object, a magnetized ring being driven in rotation by the control stem, the rotation of the magnetized ring being detected by at least one inductive sensor disposed inside a housing of the frame inside which the inductive sensor is held by elastic means.

Abstract: A location beacon assembly includes a wrist band that may be worn on a wrist. A beacon unit is coupled to the wrist band. The beacon unit is turned on when the beacon unit is exposed to water. The beacon unit selectively emits blue light. Thus, the beacon unit is visible at a maximum depth in water thereby facilitating a swimmer to be located when the swimmer is drowning. The beacon selectively emits an echolocation sound that has a frequency ranging between 10 kHz and 20 kHz. Thus, the beacon unit is audible at a maximum depth in water thereby facilitating the swimmer to be located when the swimmer is drowning.

Abstract: Sub-assembly of external parts for a watch, comprising a water-resistant joint between a first and a second component, which are screwed, one on the other, the first component supports a first inclined toothing, which cooperates with a second inclined toothing of the second component, the first component or second component, or a second ring interposed between them comprises a zone which is elastically deformable under the action of a relative rotation between the first and the second component which is caused by an external force, and the deformation range of which allows compression of the elastically deformable zone allowing clearance of the teeth tips during the relative rotation and a release of this zone, allowing return to cooperation of the tips and the hollows of the teeth in a new relative angular position.

Abstract: A watch case includes a case middle made of plastic or electroformed material and a crystal. The crystal or the case middle includes elbowed catches that are each insertable in a bayonet fitting in a recess of the case middle or the crystal. The case also includes a rotation stop angularly securing the case middle and the crystal in an angular position such that a part of each catch is frontally locked behind a holding surface of the case middle or of the crystal. The rotation stop is frontally snap-fitted on the case middle and/or the crystal by snap-fit fingers that cooperate with a complementary stop surface of the case middle and/or of the crystal.

Abstract: A timepiece provided with a metal case having a fitting section which is annularly provided in a lower portion of the inner circumferential surface, a metal lid body having a lid main body section which is arranged on a lower end of the case and covers a lower portion of the case and a cylindrical section which is arranged in the fitting section of the case, and a synthetic resin gasket having a gasket main body section which is arranged between the fitting section of the case and the cylindrical section of the lid body and a spacer section which forms a space between a lower end surface of the case and an upper surface of the lid main body section.

Abstract: To provide a timepiece which is easy to produce, a timepiece includes a case forming a ring shape; a back cover fitted to a back side of the case, and a fixing member forming a ring shape running along the circumferential direction of an inner peripheral part of the case, and having a fixing function for fixing the back cover to the case. The case is harder than the fixing member. The fixing member is disposed between the case and the back cover, and is compressed and deformed therebetween, thereby making it possible to fulfill the fixing function.

Abstract: A sealing device for a minute-repeater mechanism, comprising a striking work control bolt which can move in an aperture of a case between a rest position and a pulled-out position. The case includes a seat for receiving in sealed abutment, in the rest position of the bolt, a first sealing gasket mounted in a sealed manner on the bolt and moveable therewith, and which is at a distance from the seat when the bolt is in a pulled-out position for operating the striking work. The case includes a chamber, one wall of which comprises the aperture, which limits the travel of a second sliding sealing gasket in which the bolt slides in a sealed manner, and which is in sealed abutment on an inner surface of the chamber.

Abstract: A solar cell electronic device includes a cover glass fitted into a case opening of an exterior case via a glass packing, and a solar panel disposed on the back face of the cover glass with a predetermined distance from the cover glass. The case opening has a base portion on the inner periphery thereof for mounting an outer peripheral portion of the cover glass and for positioning the solar panel in a plane direction. The glass packing includes a packing main body interposed between the case opening and the cover glass, and a flange portion that extends from an end on the base portion side of the packing main body and that is interposed between the cover glass and the base portion. The base portion has a base opening through which at least a part of the flange portion is exposed.

Abstract: A timepiece, comprising first and second arms connected at one end at an acute angle, and a bar locking system located in a wedge area of the timepiece where the arms are connected at the acute angle, wherein the first and second arms are hollow such that they can house electrical components, and wherein the bar locking system is employed to attach the timepiece to a leash plug of a surfboard.

Abstract: A submersible device for keeping track of a swimmer's session transpired times. It includes a case which is pivotally adjustable in relation to a base, and which contains both a watertight and a ballast compartment to decrease the buoyancy of the device when in use in water. The device may include a lap counter and a proximity sensor activated by the proximity of a swimmer wearing a proximity transmitter. A high contrast liquid crystal display is used to improve visibility.

Abstract: One embodiment of the present invention provides an attachable timepiece, comprising: an upper chamber forming a housing for timepiece elements, the upper chamber including a front face having a time display; a lower chamber that is detachable from the upper chamber by way of a locking system; and a means for attaching the timepiece to an object.

Abstract: To provide a portable timepiece in which water is not easily allowed to enter the timepiece exterior assembly with the completion of venting, the timepiece is equipped with a vent valve mounted to a timepiece exterior assembly. The vent valve is equipped with a valve body holder fixed to the timepiece exterior assembly, a ring-shaped packing supported by the holder and elastically deformable, and a valve body movable between a valve-closed position and a valve-open position. The valve body has a valve body shaft portion, a valve body head integral with this shaft portion, and an exhaust recess formed in the valve body shaft portion. The valve body shaft portion axially extends through the valve body holder while in contact with the inner peripheral portion of the packing.

Abstract: To provide a portable timepiece whose vent valve construction is simple, in which the vent valve is not easily erroneously opened, and in which water is not easily allowed to enter the timepiece exterior assembly with the completion of venting. A wristwatch is equipped with a vent valve mounted to a timepiece exterior assembly. The vent valve is equipped with a pipe, a valve body, a retaining member, and packing formed of a seal material capable of elastic deformation. The timepiece exterior assembly is equipped with the pipe establishing communication between the interior and exterior thereof. The pipe has a valve seat surface, a stopper portion, and a male screw portion. The valve body is equipped with a valve body shaft portion inserted into the pipe, and a valve body head integral with this shaft portion.

Abstract: A portable timepiece has a timepiece exterior assembly with a mounting hole having seal surfaces and escape portions. A valve member has a shaft portion movably inserted into the mounting hole and a head portion connected to the shaft portion. An urging member is provided between the head portion and the assembly for urging the valve member toward the interior of the assembly. Seal members are mounted to the shaft portion in correspondence with the seal surfaces. The seal members are configured to be moved between a sealing position in which the seal members are held in contact with the seal surfaces, and an exhaust position in which the seal members are opposed to the respective escape portions. In the sealing position, the seal members define a closed space together with an outer periphery of the shaft portion and the escape portions opposed to the outer periphery.

Abstract: A timepiece has a valve that discharges gas from an exterior assembly and includes a casing, a valve member that moves from a closed position to an open position in accordance with an inner pressure of the assembly, an exhaust button movable into the casing, a first spring urging the button and valve member away from each other, and a second spring urging the button toward the exterior of the assembly. When an inner pressure of the assembly is greater than a force of the first spring, the valve member is moved to the open position and a portion of the gas accumulates between the valve member and the button. When the button is moved into the casing, the accumulated gas is discharged to the exterior of the assembly by which the valve member is maintained at the closed position by the spring force of the first spring.

Abstract: A portable timepiece has a timepiece exterior assembly with a button mounting hole having seal surfaces and escape portions. An exhaust button has a shaft portion and a button portion connected to the shaft portion and configured to be pushed inward from an exterior of the assembly. An urging member is provided between the button portion and the assembly for urging the exhaust button toward the exterior of the assembly. Seal members are mounted to the shaft portion in correspondence with the seal surfaces. The seal members undergo movement between a sealing position in which they are held in contact with the respective seal surfaces with interference through axial reciprocation of the exhaust button, and an exhaust position in which the seal members are opposed to the respective escape portions. In the sealing position, the seal members define a closed space formed by the shaft portion and the escape portions.

Abstract: A watch comprises a case, an electronic movement module inside the case, a piece of closed-cell foam inside the case, and a dielectric liquid filling the remaining voids of the interior of the case. The closed-cell foam compensates for thermal expansion of the dielectric liquid over a wide range of operating temperatures. Upon heating, the liquid expands and the foam is compressed. Upon cooling, the liquid contracts and the foam is decompressed.

Abstract: A smart card watch comprises a watch head (1) and straps (2). A timepiece device and a smart card device are provided in the watch head (1), and a card slot (126) is provided on the side of the watch head (1). People can easily carry the smart card (153) with the watch which cannot be lost easily and they can conveniently change smart cards having different functions any time and anywhere they want. The smart card has great functions and can be used and operated easily. Furthermore, the timepiece device and the smart card device are installed in separate sealed chambers, a first chamber (14) and a second chamber (15) in the watch head (1), thus the timepiece device can be well protected such that it has a prolonged endurance and an ensured working stability. Even if the backcover (13) is opened to repair the smart card device, the normal operation of the timepiece device and the water-tightness of the first chamber (14) are not affected.

Abstract: A watch comprises a case, an electronic movement module inside the case, a piece of closed-cell foam inside the case, and a dielectric liquid filling the remaining voids of the interior of the case. The closed-cell foam compensates for thermal expansion of the dielectric liquid over a wide range of operating temperatures. Upon heating, the liquid expands and the foam is compressed. Upon cooling, the liquid contracts and the foam is decompressed.

Abstract: The invention comprises a timepiece including a middle part (4) and a bezel (6) capable of rotating on the middle part (4), the bezel (6) and the middle part (4) delimiting between them an annular chamber (38) in which there is arranged a sealing gasket (40) with a U-shaped profile. A compression member (42) such as an O-ring type joint with a smooth external surface is housed in the sealing gasket (40).

Abstract: To provide a portable timepiece in which water is not easily allowed to enter the timepiece exterior assembly with the completion of venting, the timepiece is equipped with a vent valve mounted to a timepiece exterior assembly. The vent valve is equipped with a valve body holder fixed to the timepiece exterior assembly, a ring-shaped packing supported by the holder and elastically deformable, and a valve body movable between a valve-closed position and a valve-open position. The valve body has a valve body shaft portion, a valve body head integral with this shaft portion, and an exhaust recess formed in the valve body shaft portion. The valve body shaft portion axially extends through the valve body holder while in contact with the inner peripheral portion of the packing.

Abstract: To provide a portable timepiece whose vent valve construction is simple, in which the vent valve is not easily erroneously opened, and in which water is not easily allowed to enter the timepiece exterior assembly with the completion of venting. A wristwatch is equipped with a vent valve mounted to a timepiece exterior assembly. The vent valve is equipped with a pipe, a valve body, a retaining member, and packing formed of a seal material capable of elastic deformation. The timepiece exterior assembly is equipped with the pipe establishing communication between the interior and exterior thereof. The pipe has a valve seat surface, a stopper portion, and a male screw portion. The valve body is equipped with a valve body shaft portion inserted into the pipe, and a valve body head integral with this shaft portion.

Abstract: This watch case comprises a protective casing surrounded by a middle (5) and a bezel (9). The protective casing includes a glass (3), a side wall (2) and a bottom (1). A planar peripheral surface extending along the entire edge of the inner face of the glass is in contact with a similar bearing surface on the side wall (2), at least part of which forms the width of the cross section of a pressure resistant structure having parallel lateral faces (SR) perpendicular to the bearing surface, and which extends without a gap as far as the bottom (1) of the casing. The components of the casing are secured and sealed with at least one annular seal (4) surrounding the lateral face of the glass (3) and the outer lateral face of the side wall (2) of the casing, and this seal is clamped.

Abstract: A wristwatch is equipped with a timepiece exterior assembly, a valve member, a coil spring, and seal members. A pipe provided in the exterior assembly so as to establish communication between the interior and exterior thereof has seal surfaces and escape portions. The valve member is equipped with a valve member shaft portion inserted into the pipe and exhibiting a detachment preventing portion to be caught by a pipe edge portion from the outside of the exterior assembly, and a valve member head portion arranged inside the exterior assembly. The spring, which urges the valve member toward the inner side of the exterior assembly, is provided between the valve member head portion and the timepiece exterior assembly.

Abstract: A wristwatch is equipped with a timepiece exterior assembly, an exhaust button, a coil spring, and seal members. A pipe provided in the exterior assembly so as to establish communication between the interior and exterior thereof has seal surfaces and escape portions. The button is equipped with a shaft portion inserted into the pipe and exhibiting a detachment preventing portion to be caught by a pipe edge portion from within the exterior assembly, and a button portion depressed from the outside of the exterior assembly. The spring, which urges the button in an anti-pushing-in direction, is provided between the button portion and the timepiece exterior assembly.

Abstract: There is provided a wristwatch 1 in which a degassing valve with an exhaust button is attached to a timepiece exterior assembly, and in which the gas in the exterior assembly is allowed to escape to the exterior through pushing-in of the button. The valve is equipped with a valve casing providing communication between the interior and exterior of the exterior assembly, a valve member accommodated in the valve casing and moved from a closed position to an open position when the interior of the exterior assembly is not less than a predetermined pressure, the button accommodated in the valve casing so as to allow pushing-in, a first coil spring urging the button and the valve member away from each other, and a second coil spring urging the button toward the exterior of the exterior assembly.

Abstract: A marine instrument, such as a clock, barometer, or thermometer, has a face having indicia associated with the face, an instrument movement, and at least one hand having a direct or indirect connection to the movement and positioned to move with respect to the face, or a display connected to an electronic movement. The components are encased within a casing that is water tight to at least 12 inches (e.g. about 30 feet) of water. A vent, such as a porous plastic plug, allows the passage of air in and out of a substantially water-tight volume containing the movement, but precludes water passage up to the rated pressure.

Abstract: Embodiments of a Golf Round Pace Regulator timing device is shown and described. The timer, with a custom course specific face decal, illustrates the time allocated to each hole on the golf course to help golfers maintain a steady pace of play to complete the course in the time allotted by the golf course management. The golfer(s) are responsible for maintaining the same pace on the course as the pace of the timer's moving clock hand across the easy to read face decal. The timer solves the problem of slow play and decreased course revenue due to slow play. The timer solves the expensive customization manufacturing problem since it may be mass produced, and after manufacturing the customized course decal may be created and applied. The Timer is easy to implement and use on any golf course.

Abstract: A wristwatch (portable apparatus) is provided with a wristwatch exterior (apparatus exterior) having a through hole, a pipe, a push button, a coil spring, and a packing in a ring-like shape. The pipe is formed by providing an outwardly arranged cylinder portion having a spring receiving face integrally with an inserting cylinder portion. The pipe is fixed to the timepiece exterior by inserting the inserting cylinder portion to the through hole, and the outwardly arranged cylinder portion is arranged at an outer portion of the timepiece exterior. The push button includes a drawout preventing member attached to a shaft portion movably penetrating the pipe for preventing the shaft portion from being drawn out from the pipe, and an operating head provided at the shaft portion. The coil spring for urging the push button to an outer side of the timepiece exterior is interposed by the operating head and the spring receiving face.

Abstract: This watch case comprises a protective casing surrounded by a middle (5) and a bezel (9). The protective casing includes a glass (3), a side wall (2) and a bottom (1). A planar peripheral surface extending along the entire edge of the inner face of the glass is in contact with a similar bearing surface on the side wall (2), at least part of which forms the width of the cross section of a pressure resistant structure having parallel lateral faces (SR) perpendicular to the bearing surface, and which extends without a gap as far as the bottom (1) of the casing. Means for securing and sealing the components of the casing comprise at least one annular seal (4) surrounding the lateral face of the glass (3) and the outer lateral face of the side wall (2) of the casing, and means (8, 5a) for radially clamping this seal.

Abstract: A damping device, more particularly for a watchcase, includes a case (1) the back (7) of which has an extension provided with a groove (13) holding a gasket (14). The device further includes a support (2, 3) the lower segment (2) of which has a compression chamber (18) cooperating with the extension of the back of case (1), this extension being able to move axially, and in air-tight fashion, in this chamber (18). This lower segment (2) of the support is linked to a ring (3) against which case (1) leans in its rest position.

Abstract: A timepiece having an external case, a sound source disposed inside the external case, an internal filter that is gas permeable and waterproof and is disposed opposite with a gap to the external case and the sound source, and a communication opening that communicates the space between the external case and the internal filter with the outside. The internal filter is a porous thin film that has a large number of small holes and assures waterproofness preventing water from passing the small holes for at least ten minutes when in contact with water at normal pressure.

Abstract: A water-proof watch case and a method for manufacturing the same are disclosed. First, a design of a case and a bottom lid is decided, and a mold according to the design is fabricated accordingly. Next, a hard plastic material is injected into the mold to form the case and the bottom lid. Next, a soft plastic material is injected at an outer rim of the case to form at least one button, and a soft plastic material is injected at a conjunction between the case and the bottom lid to form a water-proof gasket. Finally, the hard and soft plastic materials are heated to adhere the button and the water-proof gasket to the outer rim of the case and the conjunction between the bottom lid and the case respectively.

Abstract: A timepiece having an external case, a sound source disposed inside the external case, an internal filter that is gas permeable and waterproof and is disposed opposite with a gap to the external case and the sound source, and a communication opening that communicates the space between the external case and the internal filter with the outside. The internal filter is a porous thin film that has a large number of small holes and assures waterproofness preventing water from passing the small holes for at least ten minutes when in contact with water at normal pressure.

Abstract: The invention relates to a watch case comprising a case middle (16), a bezel (18) mounted so that it can turn on the middle and defining between them an annular chamber (36) and a gap (40) open towards the outside of the case, a glass (22) mounted in sealed fashion on the bezel, a seal (42) inserted between the bezel and the middle and arranged in said chamber (36). According to the invention said seal comprises a ring (44) of annular shape made of a material of the highly elastically deformable type, of annular shape, and the cross section of which comprises two lips (44a), one bearing against the bezel (18), the other against the case middle (16), and a compression member (48) arranged in said chamber on the side of the gap, inserted between and collaborating with said lips in order to compress them against the bezel and against the case middle, respectively.

Abstract: In an electronic watch containing an electric battery assembly of large size, particularly a battery assembly including several batteries or accumulators (41, 42), the diameter of a removable cover (20) closing a large bottom opening of the back cover (14) of the watchcase is limited by the fact that the cover is provided with a bayonet fitting device having locking members (56) radially directed towards the interior. These locking members catch on a fixed support (22) having one or more housings for the battery assembly. They are arranged at the top of a substantially cylindrical annular portion (50) of the cover. A sealing gasket (52) is placed around this annular portion and compressed radially against a cylindrical surface (16) of the periphery of the opening in the back cover, which ensures water-resistance even if the bayonet fitting is not screwed all the way in. According to a variant, the cover can form the entire back cover of the case.