Patent Publication Number: US-11036187-B2

Title: Timepiece including a stop member rotatably mounted to a bezel

Description:
RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2019-056659, filed on Mar. 25, 2019, the entire content of which is incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     An embodiment of the present invention relates to a timepiece. 
     2. Description of the Related Art 
     There exists a timepiece of a structure in which after the insertion of a movement with hands and a dial into a case band of the timepiece from the mounting direction of a bezel with respect to the case band, the bezel is mounted to the case band. As an example thereof, there has been disclosed a structure in which the case band and the bezel of a timepiece are fixed in position by using a machine screw (See JP-A-2002-189084). 
     As a structure for fixing a case band and a bezel in position, apart from the machine screw fixation structure as mentioned above, there is known a structure in which an engagement portion is provided on a foot of the bezel inserted into the case band and in Which the engagement portion is engaged with the case band by utilizing the flexural force of the foot. 
     However, in the structure in which the engagement portion is engaged with the case band by utilizing the flexural force of the foot of the bezel, as the number of times that the bezel is mounted to and detached from the case band, that is, the number of times that the opening/closing is effected, is increased, there is a fear of the case band or the bezel being scraped. Further, for the case where a material subject to deformation such as gold or a hard material such as titanium is used for the bezel and the case band, the structure in which the engagement portion is engaged with the case band by utilizing the flexural force of the foot of the bezel is rather unsuitable. 
     SUMMARY OF THE INVENTION 
     In view of the above fact, it is an object of an embodiment of the present invention to make it possible to comfortably repeat the opening and closing of a bezel with respect to the case band, thereby achieving an improvement in terms of timepiece maintenance property. 
     According to a first mode of the invention, there is provided a timepiece including a case band which has an opening on an upper surface side thereof, and which has a recess in an inner peripheral portion thereof; a bezel to which a windshield is fixed and which is mounted to the upper surface side of the case band; a protrusion which is provided at a portion of the bezel inserted into an inner side of the case band and which protrudes toward the inner peripheral portion so as not to enter the recess; and a stop member which is rotatably mounted to the bezel, which is made swingable between an upper side and a lower side of the protrusion by getting over the protrusion while undergoing elastic deformation, and an upper portion of which abuts a ceiling portion of the recess and a lower portion of which abuts the protrusion in a state in which the bezel is mounted to the case band to be respectively engaged with the case band and the bezel. 
     In this timepiece, the stop member is rotatably mounted to the bezel. When accommodating the movement in the case band and mounting the bezel to the case band, a foot portion of the bezel is inserted into the case band. At this time, the protrusion provided on the foot portion protrudes so as not to enter the recess, so that it does not easily interfere with the inner peripheral portion of the case band. Further, at this time, the stop member mounted to the bezel begins to enter the recess of the case band. When the foot portion of the bezel is gradually forced into the case band, the protrusion of the bezel, which has been on the upper side of the stop member, gets under the stop member while causing the stop member to undergo elastic deformation so that the stop member may temporarily get deep into the recess. At this time, from the relative point of view, the stop member gets over the protrusion of the bezel while undergoing elastic deformation, and rotates from the lower side to the upper side of the protrusion. When getting over the protrusion, the stop member temporarily elastically extends, and, after getting over the protrusion, strives to be restored to the former configuration by its own elastic force. At this time, the upper portion of the stop member abuts the ceiling portion of the recess, and the lower portion of the stop member abuts the protrusion, with the result that the stop member is respectively engaged with the case band and the bezel. As a result, the bezel is mounted to the case band. The stop member is placed in a state in which it is accommodated between the bezel and the case band. 
     On the other hand, when detaching the bezel from the case band, the protrusion provided on the foot portion of the bezel moves from the lower side to the upper side of the stop member while causing the stop member to undergo elastic deformation so that the stop member may temporarily get deep into the recess. At this time, from the relative point of view, the stop member gets over the protrusion of the bezel, and rotates from the upper side to the lower side of the protrusion. As a result, the engagement between the stop member, the case band and the bezel is released, so that the bezel can be detached from the case band. 
     According to a second mode of the invention, there is provided the timepiece according to the first mode, wherein the bezel is provided with a support portion restricting a downward rotational range of the stop member such that when the bezel is not mounted to the case band and the bezel is placed in a horizontal state, the stop member is maintained at a predetermined position under the protrusion. 
     In this timepiece, when the bezel is not mounted to the case band and the bezel is placed in the horizontal state, the downward rotational range of the stop member is restricted by the support portion, and the stop member is maintained at a predetermined position under the protrusion. As a result, dangling of the stop member from the bezel is suppressed. Thus, when mounting the bezel to the case band, it is possible to suppress interference of the stop member with the hands and the dial mounted to the movement. 
     According to a third mode of the invention, there is provided the timepiece according to the first mode or the second mode, wherein a pair of stop members are provided on either side in the radial direction of the bezel. 
     In this timepiece, when mounting the bezel to the case band, the foot portion of the bezel is inserted into the case band and is gradually forced in, whereby the stop member is respectively engaged with the case band and the bezel on either side in the radial direction of the bezel. Thus, the operation of mounting the bezel to the case band is facilitated. 
     According to a fourth mode of the invention, there is provided the timepiece according to the first mode or the second mode, wherein the stop member is provided on one side in the radial direction of the bezel, and on the side of the bezel where the stop member is not provided, there is provided an engagement portion directly engaged with the case band. 
     In this timepiece, the engagement portion on the side of the bezel where the stop member is not provided is directly engaged with the case band, and then the side where the stop member is provided is forced into the case band, engaging the stop member respectively with the case band and the bezel. The stop member is provided on one side in the radial direction of the bezel, so that it is possible to achieve a reduction in the number of components as compared with the case where the stop member is provided on either side in the radial direction. 
     According to a fifth mode of the invention, there is provided the timepiece according to any one of the first through fourth modes, wherein the ceiling portion of the recess is inclined to the upper surface side of the case band toward the inner side in the radial direction of the case band; and the protrusion is formed in a sectional configuration tapered toward the outer side in the radial direction of the bezel. 
     In this timepiece, the ceiling portion of the recess of the case band is inclined, so that the stop member can easily get in and out of the recess. Further, the protrusion of the bezel is formed in a tapered sectional configuration, so that it is easy for the stop member to get over the protrusion. As a result, the attachment/detachment of the bezel with respect to the case band is facilitated. 
     According to a sixth mode of the invention, there is provided the timepiece according to any one of the first through fifth modes, wherein the stop member is provided with a planed growth portion constituting a margin for growth at the time of elastic deformation. 
     In this timepiece, the stop member is provided with the planned growth portion constituting the margin for growth at the time of elastic deformation, so that, as compared with the case where the planned growth portion is not provided, it is easier for the stop member to extend in the protruding direction of the protrusion when getting over the protrusion of the bezel. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view, partly in section, of a timepiece according to a first embodiment. 
         FIG. 2  is an exploded perspective view of the timepiece of the first embodiment. 
         FIG. 3  is a perspective view, partly in section, illustrating the structure of a case band. 
         FIG. 4  is an exploded perspective view of a bezel and a stop member as turned over. 
         FIG. 5  is a front view of a stop member according to a first modification. 
         FIG. 6  is an enlarged sectional view illustrating a state before the fixation of the bezel to the case band. 
         FIGS. 7A and 7B  are enlarged sectional views of portion A of  FIG. 6 . 
         FIG. 8A  is an enlarged sectional view illustrating the state in which the bezel has been fixed to the case band.  FIG. 8B  is an enlarged sectional view of portion B of  FIG. 8A . 
         FIG. 9A  is an enlarged sectional view of a stop member according to a second modification.  FIG. 9B  is an enlarged sectional view illustrating a state in which the rotational range of the stop member with respect to the case band is restricted. 
         FIG. 10  is an enlarged sectional view of a timepiece according to a second embodiment, illustrating the state before the fixation of the bezel to the case band. 
         FIG. 11  is an enlarged sectional view of the timepiece of the second embodiment, illustrating the state in which the bezel has been fixed to the case band. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the following, a mode for carrying out the present invention will be described with reference to the drawings. 
     First Embodiment 
     Referring to  FIGS. 1 and 2 , a timepiece  10  according to the present embodiment is, for example, a wristwatch, and has a case band  12 , a bezel  14  as an example of a bezel, a protrusion  16 , and a stop member  18 . 
     The case band  12  is a timepiece component which is open on the upper surface side, which has a recess  24  in an inner peripheral portion  22 , and into which a movement  26  is put from the upper surface side. At both ends of the case band  12  in  FIG. 1 , there are respectively provided band mounting portions  12 A. A wristband  32  is mounted to the band mounting portion  12 A via a spring bar  30 . As shown in  FIG. 2 , in a side surface of the case band  12 , there is formed a hole  12 B into which a shaft  28 A of a crown  28  is inserted. This hole  12 B extends through the inner peripheral portion  22  of the case band  12 . Through this hole  12 B, the shaft  28 A of the crown  28  is connected to the movement  26  accommodated in the case band  12 . 
     In  FIGS. 2 and 3 , the case band  12  is provided with a dial accommodating portion  44  accommodating a dial  34 . In the dial accommodating portion  44 , hands  35  mounted to the movement  26  are also accommodated. On the lower side of the dial accommodating portion  44 , there is provided a movement accommodating portion  46  accommodating the movement  26 . The movement accommodating portion  46  is formed in a tubular configuration in conformity with the outer configuration of the movement  26 . On the lower side of the movement accommodating portion  46 , there is formed, for example, a female screw  12 C for mounting a case back  36 . Here, the “lower side” means the back side (case back  36  side) of the timepiece  10 . 
     In  FIG. 2 , in the dial accommodating portion  44 , the movement  26  is set in position by a casing ring  38 . Between the case back  36  and the case band  12 , there is provided a case back packing  40  for securing the sealing property. 
     The inner peripheral portion  22  provided with the recess  24  is situated in the inner periphery of the dial accommodating portion  44 . When the timepiece  10  is seen, for example, in plan view, the recess  24  is provided at each of the upper side (12 o&#39;clock side of the timepiece  10 ) and the lower side (6 o&#39;clock side of the timepiece  10 ). The recess  24  is, for example, a recessed groove recessed to the outer side in the radial direction from the inner peripheral portion  22  of the case band  12 , and extends, for example, linearly or in an arcuate fashion in the width direction of the case band  12 . This width direction is the lateral width direction when the timepiece is attached to the wrist, in other words, the direction connecting 3 o&#39;clock and 9 o&#39;clock of the dial  34 . In the case where the configuration of the timepiece  10  is not square but round, the recess  24  may extend in the peripheral direction. In  FIGS. 6, 7A and 7B , a ceiling portion  24 A of the recess  24  is inclined to the upper surface side of the case band  12  toward the radially inner side of the case band  12 . As a result, the ceiling portion  24 A faces obliquely downward the central side of the case band  12 . A bottom portion  24 B of the recess  24  is formed one step lower than a bottom portion  44 B of the dial accommodating portion  44 , and is continuous with the inner side in the radial direction of the case band  12  to reach the movement accommodating portion  46 . 
     In  FIGS. 1, 2, and 4 , glass  42  as an example of the windshield is fixed to the bezel  14 , which is mounted to the upper surface side of the case band  12 . Between the bezel  14  and the case band  12 , there is provided a bezel packing  48  for securing sealing property.  FIG. 4  shows the bezel  14  as turned over. The bezel  14  has an edge portion  14 A covering the case band  12  and constituting a design surface in the periphery of the glass  42 . Further, the bezel  14  has a foot portion  14 B as a portion to be inserted into the inner side of the case band  12 . The windshield is not restricted to the glass  42  but any other transparent and hard material will do. For example, it may be a transparent resin. 
     The bottom portion  24 B of the recess  24  is formed one step lower than the bottom portion  44 B of the dial accommodating portion  44 . In correspondence with this fact, the portion of the foot portion  14 B having the protrusion  16  protrudes to the lower side (the upper side in  FIG. 4 ) of the bezel  14  beyond the other portion. 
     In  FIGS. 6, 7A and 7B , the protrusion  16  is provided on the foot portion  14 B as the portion of the bezel  14  inserted into the inner side of the case band  12 . It is a portion protruding toward the inner peripheral portion  22  so as not to enter the recess  24 . The protrusion  16  is formed in a sectional configuration tapered (tapered toward the distal end) toward the outer side in the radial direction of the bezel  14 . In other words, the protrusion  16  has an inclined surface on the upper side and the lower side. As shown in  FIG. 1 , the range of the protrusion  16  in plan view of the timepiece  10  is set to be smaller (shorter) than the range of the recess  24  of the case band  12 . As shown in  FIGS. 7B and 8B , the inclination angle of the upper surface of the protrusion  16  is different from the inclination angle of the ceiling portion  24 A of the recess  24 , whereby the distance between the protrusion  16  and the ceiling portion  24 A of the recess  24  is reduced toward the inner side in the radial direction of the case band  12 . 
     In  FIGS. 2 and 4 , the stop member  18  is rotatably mounted to the bezel  14 , and gets over the protrusion  16  while undergoing elastic deformation to be thereby made swingable between the upper and lower sides of the protrusion  16 . In the state in which the bezel  14  has been mounted to the case band  12 , the upper portion of this stop member  18  abuts the ceiling portion of the recess  24 , and the lower portion thereof abuts the protrusion  16 , with the result that the stop member  18  is respectively engaged with the case band  12  and the bezel  14 . 
     More specifically, the stop member  18  is formed by bending, for example, a metal wire line (piano line) in conformity with the outer configuration of the foot portion  14 B of the bezel  14 , for example, into a substantially C-shape. To suppress wear of the case band  12  and the bezel  14 , it is desirable for the material of the stop member  18  to be softer than the material of the portions of the case band  12  and the bezel  14  coming into contact with the stop member  18 . At the central portion in the width direction of the stop member  18 , there is formed a protruding portion  18 A partially protruding away from an insertion portion  18 C described below (in the depth direction of the recess  24  of the case band  12 ). As shown in  FIG. 1 , the protruding portion  18 A is of a configuration in conformity with the protrusion  16  of the bezel  14  and the recess  24  of the case band  12 . The range of the protruding portion  18 A is set to be wider (longer) than the range of the protrusion  16  of the bezel  14 . 
     At both ends of the stop member  18 , there are formed the insertion portions  18 C by bending both ends of the wire line inwards in the width direction. On the other hand, in the side surface of each foot portion  14 B of the bezel  14 , there are formed, for example, two mounting holes  14 C. By inserting the insertion portions  18 C of the stop member  18  into the mounting holes  14 C, the stop member  18  is mounted to the bezel  14 . The stop member  18  is rotatable around the insertion portion  18 C. A pair of stop members  18  are provided on either side in the radial direction of the bezel  14 . In correspondence with this, the protrusion  16  of the bezel  14  and the recess  24  of the case band  12  are also provided respectively in pairs. 
     Further, a support portion  50  is provided on either side in the timepiece width direction of the bezel  14 . The support portion  50  is a portion restricting the downward rotational range of the stop member  18  such that the stop member  18  is maintained at a predetermined position under the protrusion  16  when the bezel  14  is not mounted to the case band  12  and the bezel  14  is placed in the horizontal state. As shown in  FIG. 4 , the support portion  50  is formed integrally with the foot portion  14 B such that it protrudes outwardly from the foot portion  14 B. The support portion  50  protrudes at least on the lower side (the upper side in  FIG. 4 ) of the insertion portion  18 C of the stop member  18  so as to abut the stop member  18  at a position attained through rotation somewhat downwards of the stop member  18  when the bezel  14  is not mounted to the case band  12  and the bezel  14  is placed in the horizontal state. 
     As in the case of modification  1  shown in  FIG. 5 , the stop member  18  may be provided with a planned growth portion  18 B constituting a margin for growth at the time of elastic deformation. This planned growth portion  18 B is a portion obtained by bending a part of the stop member  18  in a wave-like manner. For example, a pair of or a plurality of planned growth portions are provided for one stop member  18 . 
     The stop member  18  and the mounting hole  14 C may be formed as in the case of modification  2  shown in  FIG. 9A . In this support portion  60 , the insertion portion  18 C of the stop member  18  is of a non-circular sectional configuration, for example, of a rectangular sectional configuration, and the mounting hole  14 C is of a non-circular sectional configuration, for example, an elliptical configuration. The width of the mounting hole  14 C is set to be somewhat larger than the width of the insertion portion  18 C. As shown in  FIG. 9B  in this modification, the insertion portion  18 C interferes with the mounting hole  14 C when the stop member  18  rotates to a certain degree. Also in this structure, it is possible to restrict the rotational range of the stop member  18 . That is, the support portion for restricting the rotational range of the stop member  18  may be realized in this structure. Further, the support portion may be of some other structure so long as it can restrict the rotational range of the stop member  18 . 
     (Operation) 
     In the following, the operation of the present embodiment, which is of the above-described structure, will be described. In  FIGS. 6 through 8B , in the timepiece  10  of the present embodiment, the stop member  18  is mounted to the bezel  14  so as to be rotatable around the insertion portion  18 C. This stop member  18  can be easily mounted to the bezel  14  solely by inserting the insertion portion  18 C into the mounting hole  14 C of the bezel  14 . 
     The movement  26  to which the dial  34  and the hands  35  are mounted is accommodated in the case band  12 , and when mounting the bezel  14  to the case band  12 , the foot portion  14 B of the bezel  14  is inserted into the case band  12 . At this time, the protrusion  16  provided on the foot portion  14 B does not easily interfere with the inner peripheral portion  22  of the case band  12 , so that wear due to contact between the bezel  14  and the case band  12  is not easily generated. Further, at this time, the stop member  18  mounted to the bezel  14  begins to enter the recess  24  of the case band  12  while sliding on the bottom portion  44 B of the dial accommodating portion  44  or on the bottom portion  24 B of the recess  24 . More specifically, the protruding portion  18 A of the stop member  18  begins to enter the recess  24 . 
     As shown in  FIGS. 7A, 7B, 8A and 8B , when the foot portion  14 B of the bezel  14  is gradually forced into the case band  12 , the protrusion  16  of the bezel, which has been on the upper side of the stop member  18 , gets under the stop member  18  ( FIGS. 8A and 8B ) while causing the stop member  18  to undergo elastic deformation so that the protruding portion  18 A of the stop member  18  may temporarily get deep into the recess  24  ( FIG. 7B ). At this time, from the relative point of view, with the stop member  18  undergoing elastic deformation, the protruding portion  18 A thereof gets over the protrusion  16  of the bezel, and rotates from the lower side to the upper side of the protrusion  16 . 
     The stop member  18  is of a C-shaped bent configuration, so that when getting over the protrusion  16 , it temporarily elastically extends, and, after getting it over, strives to be restored to the former configuration due to the elastic force of its own. At this time, the upper portion of the protruding portion  18 A of the stop member  18  abuts the ceiling portion  24 A of the recess  24 , and the lower portion of the stop member  18  abuts the protrusion  16 , with the result that the stop member  18  is respectively engaged with the case band  12  and the bezel  14 . As a result, the bezel  14  is mounted to the case band  12 . The protruding portion  18 A gets over the protrusion  16  by utilizing the elastic deformation of the stop member  18 , so that wear is likely to occur. Further, the protrusion  16  of the bezel  14  is formed in a tapered sectional configuration, so that when the protruding portion  18 A of the stop member  18  gets over the protrusion  16  and strives to be restored to the former configuration by the elastic force of its own, it is likely to abut the protrusion  16 . 
     The inclination angle of the upper surface of the protrusion  16  is different from the inclination angle of the ceiling portion  24 A of the recess  24 , whereby the distance between the protrusion  16  and the ceiling portion  24 A of the recess  24  is reduced toward the inner side in the radial direction of the case band  12 . Thus, when the protruding portion  18 A of the stop member  18  gets over the protrusion  16  and strives to be restored to the former configuration by the elastic force of its own, the protruding portion  18 A abuts not only the protrusion  16  but also the ceiling portion  24 A of the recess  24 . As a result, the stop member  18  is not restored to its natural state but is constrained in a state in which it is somewhat deformed elastically. This helps to suppress generation of noise. Further, the protruding portion  18 A abuts the upper side of the protrusion  16  due to the elastic force of the stop member  18 , whereby it is possible to exert a downward force on the protrusion  16 . As a result, the bezel  14  can be drawn into the lower side of the case band  12 . 
     In the present embodiment, a pair of stop members  18  are provided on either side in the radial direction of the bezel  14 , so that when mounting the bezel  14  to the case band  12 , by forcing the foot portion  14 B of the bezel  14  into the case band  12 , the stop member  18  is respectively engaged with the case band  12  and the bezel  14  on either side in the radial direction of the bezel  14 . Thus, the operation of mounting the bezel  14  to the case band  12  is facilitated. 
     On the other hand, when detaching the bezel  14  from the case band  12 , the protrusion  16  provided on the foot portion  14 B of the bezel  14  moves from the lower side to the upper side of the stop member  18  while causing the stop member  18  to undergo elastic deformation so that the stop member  18  may temporarily get deep into the recess  24 . At this time, from the relative point of view, the stop member  18  gets over the protrusion  16  of the bezel  14  and rotates from the upper side to the lower side of the protrusion  16 . As a result, the engagement between the stop member  18  and the case band  12  and the bezel  14  is released, so that it is possible to detach the bezel  14  from the case band  12 . 
     If the stop member  18  has been worn due to the attachment/detachment of the bezel  18  with respect to the case band  12 , it is only necessary to replace the stop member  18 . Since the stop member  18  is an inexpensive component formed by bending a wire line, it is possible to suppress the replacement cost. 
     As shown in  FIG. 2 , when the bezel  14  is not mounted to the case band  12  and the bezel  14  is placed in the horizontal state, the downward rotational range of the stop member  18  is restricted by the support portion  50 , and the stop member  18  remains at the predetermined position under the protrusion  16 . This helps to suppress dangling of the stop member  18  from the bezel  14 . Thus, when mounting the bezel  14  to the case band  12 , it is possible to suppress interference of the stop member  18  with the hands and the dial mounted to the movement  26 . 
     Further, as shown in  FIGS. 7A, 7B, 8A and 8B , the ceiling portion  24 A of the recess  24  of the case band  12  is inclined, so that the stop member  18  can easily get in and out of the recess  24 . Since the protrusion  16  of the bezel  14  is formed in a tapered sectional configuration, the stop member  18  can easily get over the protrusion  16 . Thus, the attachment/detachment of the bezel  14  with respect to the case band  12  is facilitated. 
     The stop member  18  of modification  1  shown in  FIG. 5  is provided with the planned growth portion  18 B constituting a margin for growth at the time of elastic deformation, so that, as compared with the case where there is no planned growth portion  18 B, when the stop member  18  gets over the protrusion  16  of the bezel  14 , it can extend more easily in the protruding direction of the protrusion  16 . 
     In this way, in the present embodiment, it is possible to comfortably repeat the opening and closing of the bezel  14  with respect to the case band  12 , making it possible to achieve an improvement in terms of timepiece maintenance property. 
     In the case where the bezel is fixed to the case band by using a machine screw, a female screw for fastening the machine screw is cut in the foot portion of the bezel, so that the bezel must be endowed with a rather large width, making it impossible for the dial to show itself large, which affects visibility. The case band must also be provided with a through-hole through which the screw is to be passed, and to hide the screw, it is necessary to arrange the screw, for example, on the upper surface of the wristband. 
     In this respect, in the present embodiment, there is no need to provide a machine screw, so that as compared with the case where the machine screw is employed, the edge width of the bezel  14  can be relatively thinner. Thus, it is possible for the dial  34  to appear larger, thereby achieving an improvement in terms of visibility. Further, the stop member  18  is accommodated between the bezel  14  and the case band  12  so as to avoid waste in terms of space, so that no surplus space is required inside the timepiece  10 . Thus, it is also possible to secure the arrangement space for the wristband  32  under the bezel  14 . 
     Second Embodiment 
     In  FIGS. 10 and 11 , in a timepiece  20  according to the present embodiment, the stop member  18  is provided on one side in the radial direction of the bezel  14 . For example, it is provided on the upper side (12 o&#39;clock side of the dial  34 ) or on the lower side (6 o&#39;clock side of the dial  34 ) of the timepiece  20 . 
     On the side of the bezel  14  where the stop member  18  is not provided, and more specifically, on the side in the radial direction of the bezel  14  opposite the protrusion  16 , there is provided an engagement portion  52  directly engaged with a recess  25  of the case band  12 . The engagement portion  52  is provided on the foot portion  14 B. The engagement portion  52  is a protrusion of a configuration such as will enter the recess  25  with the outer surface of the foot portion  14 B being held in contact with the inner peripheral portion  22 . The protrusion  16  engaged with the stop member  18  protrudes toward the inner peripheral portion  22  of the case band  12  so as not to enter the recess  24 , whereas the engagement portion  52  protrudes to a position where it enters the recess  25 . That is, the engagement portion  52  protrudes farther than the protrusion  16 . 
     As shown in  FIG. 10 , in the timepiece  20  of the present embodiment, the engagement portion on the side of the bezel  14  where the stop member  18  is not provided is directly engaged with the case band  12 , and then the side where the stop member  18  is provided is forced into the case band  12 , thereby engaging the stop member  18  respectively with the case band  12  and the bezel  14  ( FIG. 11 ). The stop member  18  is provided on one side in the radial direction of the bezel  14 , so that, as compared with the case where the stop member  18  is provided on either side in the radial direction, it is possible to reduce the number of components. 
     The engagement of the stop member  18  and the case band  12  and the bezel  14  and the release thereof at the time of attachment/detachment of the bezel  14  are the same as those in the first embodiment. The portions that are the same as those of the first embodiment are indicated by the same reference numerals in the drawings, and a description thereof will be left out. 
     OTHER EMBODIMENTS 
     The present invention is not restricted to the embodiments described above by way of example. It goes without saying that the present invention can be carried out in various modifications without departing from the scope of the gist of the invention. 
     While in the above description the recess  24  is a recessed groove extending in the width direction of the case band  12 , the recessed groove may be provided intermittently at a plurality of portions. Further, the recess  24  is not restricted to a recessed groove but may be one or more local recesses. A combination of a recessed groove and a local recess is also possible. 
     While in the above description the protrusion  16  is of a tapered sectional configuration the upper and lower surfaces of which are inclined, the upper and lower surfaces are not restricted to flat surfaces but may also consist of curved surfaces. Further, the upper and lower surfaces of the protrusion  16  may consist of a combination of a flat surface and a curved surface.