Abstract: To provide a thin type timepiece having antimagnetic performance and waterproofness. A case side wall includes therein a movement. A case back lid is fixed to the case side wall by raised portions. Further, the case back uses a two-layer clad material of a soft magnetic material and a non-magnetic material, and the soft magnetic material is disposed on the movement side of the case back lid.

Abstract: To provide a wrist watch having a small rim width while ensuring the strength of a glass rim. A movement with hands and a dial plate is assembled into a barrel from a side of a glass rim. A water-proof packing is arranged between a glass rim and the barrel. Machine screws are mounted inside the water-proof packing to fix the barrel and the glass rim together.

Abstract: The present invention concerns a device for securing a back cover (6) to a middle part (28) of a watchcase (26), the back cover (6) having a screw thread (8) on its outer periphery, the device being characterized in that it includes an intermediate element (1) including a resilient blocking element (4) and a metal element (2) concentric to the resilient blocking element (4), this intermediate assembly being forcibly driven into the lower part of the middle part (28) of the watch (26), and the back cover (6) being screwed onto the metal element (2) so that, when the back cover (6) is completely screwed onto the metal element (2), the metal element (2) can be pivoted by sliding on the resilient blocking element (4) to a stop point from which the resilient blocking element (4) can in turn pivot by sliding on the middle part (28) of the watch (26), allowing the alignment of the back cover (6) to be adjusted with respect to the vertical 12 o'clock-6 o'clock axis of the watch (26).

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.

Abstract: There is disclosed a wristwatch (1) whose wristband (6) is attached to a support (3) with respect to which the case (2) can turn over to show one or other of its faces (16, 17). The support (3) includes, on the parallel inner surfaces (9) of its flanges (7), grooves (10) in which snugs (39) connected to the case can slide and pivot. Stops are provided in the grooves (10), to stop the case sliding after a first sliding travel of the snugs (39) from the ends (42) of the grooves, to define a pivoting zone of the case, before the snugs effect a second sliding travel to the other ends (42). Support surfaces (11) and a transverse recess (12) are provided on the bottom (4) of the support to prevent the case turning over except in the zone of the stops.

Abstract: To provide a thin type timepiece having antimagnetic performance and waterproofness. A case side wall includes therein a movement. A case back lid is fixed to the case side wall by raised portions. Further, the case back uses a two-layer clad material of a soft magnetic material and a non-magnetic material, and the soft magnetic material is disposed on the movement side of the case back lid.

Abstract: The watch case includes a back cover (2), a middle part (3) and a bezel (4) closed by a crystal (5) delimiting together a space in which a watch movement (1) is housed for an analogue or digital time display on a dial (6) arranged below the crystal (5). It is characterized in that the bezel (4) is made of metal and has locally a ring (14) of sufficient thickness to include in its lower portion a first series of threaded holes (11) for screwing in a first series of screws (10) for fixing the movement (1) onto the bezel (4) and a second series of threaded holes (21), offset angularly with respect to the first series, passing through the movement (1), and intended for screwing the back cover (2) into the lower part of the bezel (4).

Abstract: To stably fix a module to a case having a one-piece structure and thin a thickness between an inner side face and an outer side face of the case. A fitting projected portion is a projection in a tapered shape spreading to a side of cover glass and provided at a portion of an elastically deformed portion in a shape of a two ends supporting beam integrally formed to a first housing made of resin. According to the elastically deformed portion in the shape of the two ends supporting beam, when a module is integrated to a containing portion of a case, the fitting projected portion is pressed by an inner side face of the case and therefore, planarly deformed in a direction of a center of the case. Further, when the elastically deformed portion in the shape of the two ends supporting beam deformed in this way is recovered to an original shape when the fitting projected portion is fitted to an engaging recessed portion.

Abstract: A wristwatch is converted into an emergency call device by unscrewing a rear cover from the back of the wristwatch housing and screwing in a transmitter housing that carries a signal-emitting mechanism.

Abstract: The watch case includes a middle part (2) and a removable back cover (3). The back cover (3) is held under the middle part by means of at least one rail (5), this rail having a first portion (7) arranged to be slid into a groove (9) made in the middle part (2) and a second portion (11) arranged to cap an edge (13) of the back cover (3). Without using tools, the user can remove the rail, take off the back cover and change the battery or batteries powering the movement.

Abstract: A circular case battery hole is formed in the case back right below a battery accommodation hole, and in a portion of the outer surface around the battery hole is provided a battery cover detachment recess portion. A battery cover is formed of a disklike elastic sealing member having a large-diameter portion at its watch case interior side and a small-diameter portion at its outer side, and a disklike hard member made of a metal, a plastic, or the like joined to outer side of the elastic sealing member. The battery cover is attached to the case battery hole portion in such a manner that the small-diameter portion of the elastic sealing member has a horizontal fitting margin relative to the case battery hole. In the battery cover of this embodiment, the elastic sealing member has a fitting recess portion at its outer side while the hard member has an fitting projection portion at its internal side, and the elastic sealing member and the hard member are joined by projection-recess fitting.

Abstract: A device for assembling two mechanical pieces, of which the first one (3) carries a skirt (14), which, in the assembled position, extends into a cavity of the second piece (1), by means of an elastic segment (5), is characterised by the fact that the elastic segment (5) is made of a material exhibiting a shape memory. This segment (5) can assume two different shapes, depending upon its temperature. This elastic segment (5) has an external peripheral part which is circular and which is engaged into a circular groove (4) provided on the second piece (1), this circular groove (4) being located in a plane which is perpendicular to the axis of the cavity of this second piece (1); this elastic segment (5) carries, on its inner periphery, protrusions (7) which, in a first state of the segment (5) are situated in the plane of the external peripheral part of the segment (5) and, in a second state of the segment (5), protrude out of this plane.

Abstract: The present invention concerns a device for securing a back cover (6) to a middle part (28) of a watchcase (26), the back cover (6) having a screw thread (8) on its outer periphery, the device being characterized in that it includes an intermediate element (1) including a resilient blocking element (4) and a metal element (2) concentric to the resilient blocking element (4), this intermediate assembly being forcibly driven into the lower part of the middle part (28) of the watch (26), and the back cover (6) being screwed onto the metal element (2) so that, when the back cover (6) is completely screwed onto the metal element (2), the metal element (2) can be pivoted by sliding on the resilient blocking element (4) to a stop point from which the resilient blocking element (4) can in turn pivot by sliding on the middle part (28) of the watch (26), allowing the alignment of the back cover (6) to be adjusted with respect to the vertical 12 o'clock-6 o'clock axis of the watch (26).

Abstract: Looseness in the fit of a wristwatch to the wrist of a user is taken up by affixing a thin spacer to the back of the watch. The spacer is formed from a sheet of thermoplastic material with a pressure sensitive adhesive on a surface thereof, and is affixed to the watch, after cleaning of the watch if necessary, by pressing the pressure sensitive adhesive surface of the spacer against the watch. Spacers are packaged in spaced apart multiples on a display card, with a removable transparent film covering the spacers on the display card.

Abstract: A watch with a liquid crystal display with the display and the device for controlling the display being formed as two separate pieces so that the display can be inserted through a front side of the watch case body and the control device, such as a printed circuit board, can be inserted through a back side of the watch case body. The liquid crystal display may include a partially reflective sheet in order to provide greater contrast and/or aesthetic appeal. Also, a method for assembling a watch wherein a liquid crystal display is inserted through the front side of the watch case body. This watch and related assembly method can allow a larger size display relative to the size of the watch case body.

Abstract: A modular jewelry item, particularly a ring, an earring, a pendant, or a timepiece such as a watch, consisting of at least one hollow portion and one central portion complementary in shape to the hollow portion, said central portion being detachable from the hollow portion.

Abstract: The invention relates to a timepiece having a body or frame upon which an added element may be held, in a detachable manner. The invention also relates to a method of assembling this element on said body or frame.This timepiece is characterized in that the fixation means of the element added to the body or frame are formed by at least one rotating bolt (10) which is anchored permanently in the material itself of the body or frame (2) and is axially immobilized by said material.

Abstract: A watch housing has a mechanism carrier, an upper part and a base part which are installed on the mechanism carrier by screws which directly connect the upper part and the base part. Furthermore, sealing members are provided in order to make the watch housing water-tight. The design freedom for the watch housing is improved in advantageous manner by designing the mechanism carrier as a support element and also the upper and base parts as shells.

Abstract: A plastic case for an electronic device such as a wrist or pocket watch, has a bottom (1), a cover glass (2) and a support body (3), as well as a dial (6). The support body (3) serves as a base for the dial (6). The bottom (1) and cover glass (2) are fixed to the support body (3) by means of irreversible connections (7, 8). The irreversible connections have first self-locating structures (7) for irreversibly attaching the bottom (1) to a lower portion of the support body (3), and second self-locating structures (8) for irreversibly attaching the cover glass (2) to an upper portion of the support body (3) so that the support body (3) lies between the cover glass (2) and the bottom (1). The support body (3) can have attachments (12) for fitting holders such as a bracelet or chain or holders can be formed on the support body (3).

Abstract: A modular wristwatch assembly comprises a bezel having a transparent watch crystal mounted therein, first and second pairs of watch band lugs joined to opposite exterior side edge regions of the bezel, a rigid watch back member, and a rigid, annular watch movement retaining member disposed between the bezel and the back member. Included in the assembly are a watch movement, having a watch face and hands for indicating the time, installed in the watch movement retaining member and having operating controls extending outwardly therethrough. There is further included a decorative ring installed between an under surface of the bezel and an upper surface of the watch face, the ring being around peripheral edge regions of the face so as not to interfere with the time indicating means and being visible through said watch crystal. Screws are used for detachablably attach the bezel and the watch back member together with the watch movement retaining member and watch movement held therebetween.

Abstract: A watch case back cover assembly includes a case back cover removably mounted to a case frame, an elastic member, and a cover plate. The case back cover includes a recess defining an outer side thereof, wherein the recess is defined by a bottom surface and an annular periphery, and wherein the annular periphery has an annular groove defined therein. The elastic member includes at least one elastic piece slidably received in the annular groove and at least one elastic extension bearing against the bottom surface. The cover plate it is secured to the elastic member to rotate therewith and has characters formed on an outer face thereof. The cover plate and the elastic member are rotatable relative to the case back cover when the cover plate is pressed.

Abstract: A watch case has a water-tight casing (1) capable of being manufactured economically in hard materials, the casing parts being held assembled by an external support device (2) having structure for attaching the-case to a wristlet or other fixing apparatus. The casing (1) is formed of stacked parts preferably including a crystal (7), an annular middle part (9) and a back cover (8). The mutual contact surfaces (13, 14, 15, 17) of these parts are polished and have no sealing gasket. The support device includes two parallel metal clamps (25) in the form of an open or closed frame, having two portions assembled by screws (28) arranged axially to grip the casing in the clamp. The casing (1) may be made entirely of sapphire, but other materials having zero porosity or a closed structure such as hard metals, ceramics or mineral glass may be used.

Abstract: A timepiece and a case intended to fit such a timepiece. This timepiece comprises a clockwork movement (12), a case (2) consisting of a caseband (4) and a back cover (6) forming a housing (10) for receiving said movement (12), means for axial positioning (25, 26) and means for lateral positioning (P) of the movement (12) with respect to the case (2). The axial positioning means are arranged in a peripheral region of the housing (10) and may allow a lateral play along a support plane (27). The lateral positioning means (P) are arranged respectively on the back cover (6) of the case (2) and on a lower part (14b) of the frame (14), preferably in the form of a central stud (6) fixed to the back cover (6) and engaged with an axial play in an opening (38) of the movement.

Abstract: A watch with improved water-proof and pressure-resistance characteristics is disclosed. It comprises: (a) a casing, a bottom cover affixed to the casing, a screw winding crown, and a receiving port on the casing for receiving the screw winding crown; (b) a first double-thread coupling arrangement provided between the screw winding crown and the receiving port; and (c) a second double-thread coupling arrangement provided between the casing and the bottom cover. The first double-thread coupling arrangement comprises an externally and internally threaded annular section provided on the screw winding crown, a matching externally and internally threaded annular recess provided in the receiving port, and a first packing ring provided between the receiving port and the screw winding crown.

Abstract: A medical timing device for administering to the medical treatment of patients whom are confined to a bed or wheelchair. The invention comprises a first timing unit for measuring an interval of time having a programmable duration; an actuator for activating the time measurement of the programmable time interval; a plurality of switches, each of which corresponds to a distinct, predetermined medical treatment; and a visual indicator for indicating the completion of the measuring of the programmable time period by the first timing unit, and for indicating the selected medical treatment to be performed.

Abstract: A watch case (M) including a caseband (1) and a back cover (4) which can be engaged with and clamped in the caseband by imparting a rotational movement to the back cover (4) through a predetermined angle (.OMEGA.) around an axis of closure (O--O'). The back cover (4) and the caseband (1) include wall portions (16, 24) of complementary undercut forms the peripheral profile of which comprises four sections (38, 48) in circular arc form each centered on a center (C.sub.c, C.sub.f) separated from the axis of closure (O--O') . The sections (38, 48) are connected among themselves by a reentrant section (40, 52). Each back cover section (48) is associated with a caseband (1) section (38).

Abstract: Shock absorbing members are attached to an outer rim of a back surface of a wristwatch case body at 6- and 12-o'clock portions thereof, and they extend outward and curve downward. Each of the shock absorbing members has rising portions extending from its both side ends and which are freely swingably attached to the wristwatch case body to a circumferential surface of the wristwatch case body. In addition, a part of a front surface and the circumferential surface of the wristwatch case body are covered by a first cover member made of soft synthetic resin, and the first cover is partly covered by a metal-made second cover member. When shock is applied to the front and circumferential surfaces of the wristwatch case body, the shock is reduced or absorbed by the rising portions of the shock absorbing members. When shock is applied to the back surface of the case body, the shock is reduced or absorbed by the shock absorbing member.

Abstract: A water-resistant timepiece of the type including a crystal, a timepiece dial and movement assembly, and a long-life energy cell, which comprises a continuous case of plastic having: a first outer peripheral member adapted to receive said dial and movement assembly and the long-life energy cell, and further adapted to receive the crystal to form a water-resistant seal therewith; a thin substantially flat case back wall integral with the peripheral member to form an annular edge; and a peripheral groove located in the bottom of the peripheral member. A case back blank of substantially uniform thickness, having a substantially flat central portion and an integral peripheral side wall, and preferably made of stainless steel, cooperates with the peripheral groove of the case to integrally attach the case back blank to the case to complete a thin timepiece having improved water resistance, high mechanical and structural integrity, and an aesthetic appearance.

Abstract: A tanning-enabled wristwatch having a watch head assembly and a watch band for suspending the watch head assembly around the wrist of a user. The watch head assembly includes a watch compartment having a time keeping mechanism and a display or other indicator device for conveying a time value to a user. The watch head assembly also feature a unique housing for supporting said watch compartment such that the housing extends below said watch compartment in a predetermined relationship. The housing is made from a material which is capable of transmitting ultraviolet light through the housing. The housing is also formed with a surface configuration for redirecting ultraviolet light impinging upon a top surface of the housing to an area beneath the watch compartment.

Abstract: A watch having a face and a case of circular profile surrounding the face. The case includes a circular raceway and a plurality of separate decorative inserts, each in the shape of a linguistic element, e.g., a letter of the alphabet or a symbol, e.g., a heart, denoting a word or a concept. The raceway is disposed under a transparent bezel immediately adjacent the periphery of the case. The inserts are arranged to be slidably mounted in the raceway in any predetermined order to establish a predetermined message, e.g., a person's name, so that the message carried by the insert can be slid about the entire circumference of the case to be displayed at any orientation. The inserts are held in a predetermined orientation, i.e., their tops are directed radially away from the center of the watch so that the message is readily readable irrespective of its location along the periphery of the watch.

Abstract: A wristwatch case includes a caseband (12) which receives a movement (2) surmounted by a dial (3). A crystal (5) and a back cover (6) are secured to the caseband as well as first (7) and second (8) bracelet strands. The back cover entirely covers over the underside of the caseband and includes first (9) and second (10) integrally formed wings. Such wings cover over entirely the outer sides (11) exhibited by the caseband and which are found situated between the bracelet strands. The back cover is preferably made of ceramic material.

Abstract: An integral battery cover and adjustable stand for securing a battery and for providing a stand for a battery-powered display device comprises stand legs which, in one configuration, provide a stand such that the display device has a viewing angle of approximately 45 degrees with respect to the desk top surface. The battery cover/stand further comprises retaining ribs which cooperate with corresponding retaining grooves in the display device. The retaining ribs and grooves allow the battery cover/stand to be easily adaptable to one of three variations, each allowing the display device to have a different viewing angle.

Abstract: A timepiece including a ring (6) which assures a quadruple function: that of a water-tight packing between the crystal (1) and the ring; that of securing the caseband (3) to the ring; that of a casing ring for the movement (5) and finally that of securing the back cover to the ring. To this effect the caseband exhibits a cylindrical internal wall (4) entirely overlaid by the ring, said ring exhibiting a first accommodation (8) in which the crystal is engaged, a second accommodation (10) in which the movement is engaged and a lower zone (11) including means (18, 19) for securing the back cover.

Abstract: The watch has a housing, composed of a metal center part (1) having a molded-on glass collar (1a), a watch glass (2), over whose rim (2a) the glass collar engages, and a metal base (3) fixed to the center part by screws (8). A movement retaining ring (6) made from plastic is inserted in the center part (1). A first seal (4) lies between the movement retaining ring (6) and the rim (2a) of the watch glass (2) and a second seal (5) between the movement retaining ring (6) and the base (3). The screws (8), which pass through apertures (9) in the edge region (3a) of the base (3) and are screwed into axial threaded openings (10) in the center part (1) not only serve to secure the base but also simultaneously compress both seals (4, 5) when tightened.

Abstract: A removable cover (10) for closing an opening (15) of a battery housing in an electronic watch having an armature (7) which is a flat metal disc with central and peripheral openings in which a molded cylindrical packing member (9) is anchored. The back (14) of the watch case is formed with a circular opening (15) with a particular profile suited to the diameter of the packing member (9). The latter, by radial compression, secures the cover and provides fluid-tightness. All of the operations for mass-producing the cover (10) and fitting it are carried out mechanically, without manual intervention, and are automated.

Abstract: A case for a wrist watch the caseband (12) of which bears lugs (17) and the back cover (10) of which is provided with a central rib (26) and radial ribs (28a, 28b, 28c). The peripheral end of certain radial ribs (28a, 28c) coincides with the line of extension of each lug (17).

Abstract: A cap (2) is made of sintered hard metal and has on the inside a cylindrical surface (20) and a frusto-conical surface (21) that are true ground. The cap's cylindrical surface (20) is fitted with radial play around an outer cylindrical surface (9) of an underlying middle (1) and the cap's frusto-conical surface (21) has the same inclination as a subjacent frusto-conical surface (14) on the outside of the middle. The cap (2) and the middle (1) are secured to one another by a ring of deformable material sandwiched between their cylindrical surfaces (9, 20). On the outside the cap (2) is formed over its thicker main portion (18) with a trued and polished surface (22) having the same inclination as its inside frusto-conical surface (21) such as to provide the thicker portion (18) with a parallelogrammatic cross-section.

Abstract: The watch case of this invention includes a caseband (2) made from sintered material and a back cover (10) secured to the caseband by means of at least two pins (12). Each pin passes through a first hole (14) provided in a first projection (16) formed in the caseband and two second holes (13, 15) provided respectively in two second projections (17, 18) formed in the back cover, said second projections being arranged respectively on either side of said first projection. Each pin being axially retained in its holes by the elastic effect provided by the seal when the caseband lies on the back cover.

Abstract: A sealed watchcase includes a middle-and-bezel having two concentric annular parts which are held one inside the other by means of friction. The internal part of these two parts is a rigid ring made of ordinary metal or plastic. The external part of these two parts is made of precious-metal and forms a thin casing covering at least the radially external surfaces of the rigid ring. A glass part is bonded inside an internal snap in the precious-metal casing. A back cover is held against a bottom flat surface of the middle-and-bezel by fixing screws which are screwed into the rigid ring and ensure, when tightened, clamping of a fitting ring inserted together with a watch movement into the opening of the rigid ring. Seals are compressed between the back cover and the middle-and-bezel. Only the back cover, the precious-metal casing and the glass form the external parts of the watchcase.

Abstract: The skeleton watch of this invention includes a caseband (1) bearing a frame (6) arranged between an upper crystal and a back cover (26), a leg (8) contiguous to the frame, a motor (10, 11, 12) secured to the frame and including a rotor directly driving a minutes wheel (15) bearing a minutes marker (17). An hours hand (18) is driven by the minutes wheel through motion work including a train of planetary gears (23, 24). Zones (27 to 32) and conductors (33 to 37) are metallized on the internal face of the back cover and are intended respectively to accommodate the electrical and electronic components and establish connections among such components. The arrangement as set forth permits a greatly bared skeleton watch with a minimum of noticeable elements.

Abstract: A timepiece includes an outer caseband 3 formed entirely in one piece of a hard material which likewise includes a hub member 4 providing the timepiece dial, and a metallic inner caseband 16. An annular step 10 for positioning and glue fastening a crystal 9 surrounds the hub member. This arrangement gives the hard material the rigidity necessary to resist forces acting thereon during manufacture and subsequently when the watch is worn.

Abstract: The wrist watch case of this invention includes a caseband-back provided with supports for retaining a movement assembled from above the caseband. The caseband-back is provided with a circular opening having a diameter substantially greater than the diameter of a circle circumscribing the movement. The opening is blocked by a cap which is fixed to the caseband-back by fastening means arranged at the exterior of said circumscribing circle and at a level located above the lower face of the movement. The cap is provided with notches arranged and adapted to cooperate with a wrench supplied to the watch user thereby to open or close the cap and thus permit changing the battery. The wrench may form an integral part of the bracelet buckle.

Abstract: The case is essentially made up of a hollow middle cum glass unit (1), consisting of an integral glass pressing, and of a metal back (10) closing off a cavity (5) defined by the inside surface of the hollow unit, the cavity providing a housing for a movement.In the cavity is mounted a metal ring (15) having a centering flange (16) bearing against the middle portion of the unit. In the space between the ring and the middle portion are inserted a deformable rubber gasket (19) and a metal annulus (18) whose radially outer surface is formed with a bevel (18') in the region nearest the gasket.Screws (20) secure the back (10) to the ring (15) and press it against the annulus (18). On being driven home, the screws wedge the bevel (18') between the gasket and the ring thereby to apply a radial force on the gasket . This force presses the gasket against the middle portion of the unit and prevents it from moving out of the cavity.

Abstract: A wrist watch and bracelet assembly in which the case is of bipartite construction and is formed by a base section adapted to accommodate a watch movement and an ornamental face section that is readily replaceable by a face section having a different ornamental display, whereby the decorative appearance of the watch may readily be changed. The base section is provided at either end with a pair of pierced ears that project forwardly from the corners, while the face section which is seated on the base section is provided at either end with an array of equi-spaced lugs having holes therein which register with those in the ears so that by inserting a cross pin through the holes to bridge the ears and the lugs, the two sections are then interlocked.

Abstract: A timepiece includes an outer caseband 3 formed entirely in one piece of a hard material which likewise includes a hub member 4 providing the timepiece dial, and a metallic inner caseband 16. An annular step 10 for positioning and glue fastening a crystal 9 surrounds the hub member. This arrangement gives the hard material the rigidity necessary to resist forces acting thereon during manufacture and subsequently when the watch is worn.

Abstract: The back cover of the case is provided with positioning means which determine more or less precisely the location where means external to the case must be placed in order to actuate each control mechanism.Such positioning means may for example take the form of grooves at the bottom of each of which is located a control mechanism and into which may be introduced a portion of the securing element of the bracelet.It might likewise comprise protuberances or portions in relief or cavities of more complex form, the remaining parts forming guide means for guiding the external actuating means toward such positioning means.This invention concerns electronic watches having a system of operating controls located in the back cover of their cases.

Abstract: The invention relates to a base element for a wristwatch in the form of a laminate, which simultaneously serves the purpose of a movement plate or frame and a case back and which consists of two integrally joined plates, these plates being bonded together in particular by means of a foil using ultrasonic heat-sealing. Such a base element may be manufactured with high precision simply and cheaply and has good stability, especially when a circular edge is folded to the inside of one of the plates of the base element for the purpose of reinforcement.

Abstract: To simplify fitting and sealing the crystal (4) to the casing (2, 6, 8), assembly is effected by means of ultrasonic welding. The casing (2, 6, 8) and the crystal (4) are made of synthetic materials which are thermo-weldable to each other. The mating faces (8a, 4b) of the peripheral wall (8) of the casing and the crystal (4) are formed for reducing the contact area between the two parts to permit thermo-welding by subjecting the assembly to high-frequency mechanical vibrations imparted by a tool (15).

Abstract: A structure of a rotating mechanism for a watch case having a time display section, comprising a case body internally accommodating the time display section and having a lower opening, a back cover fitted into the lower opening of the case body, a retining ring secured to a lower portion of the case body, and a band attaching base engaging with the case body by being clamped between the retaining ring and the case body. The case body is adapted to rotate with respect to the band attaching base.

Abstract: A wristwatch comprises an outer case having a longitudinal retaining bore. A hollow, generally cylindrical plastic seal is disposed in the bore. The seal includes upper and lower portions, the lower portion being of reduced diameter. The upper portion includes a radial notch and an upper recess disposed above the notch. The lower portion includes a radially inwardly projecting flange and a lower recess disposed below the flange. A watch movement includes a collar which is seated on the flange so as to be radially and longitudinally positioned within the seal. A watch face is disposed above the movement and is mounted in the notch. The watch face engages the watch movement to longitudinally retain the watch movement. A crystal is mounted in the upper recess, and a bottom cover is mounted in the lower recess.