Abstract:
A portable timepiece has a bezel rotatably disposed on a case body, and an elastically deformable gasket interposed between the case body and the bezel in an elastically deformed state to exert a frictional force on the case body and the bezel sufficient to maintain the bezel in a stationary rotational position though permitting the bezel to be manually rotated to any desired position by overcoming the frictional force. One or more lock members are movably disposed on the bezel and contact a slip-preventing part provided on the case body. A manually rotatable holding ring engages with the lock members and is rotatable in one direction to increase the contact pressure between the lock members and the slip-preventing part to thereby prevent unintended rotation of the bezel, and is rotatable in the other direction to decrease the contact pressure to thereby permit manual rotation of the bezel by overcoming the frictional force exerted by the elastically deformed gasket. In this manner, inadvertent rotation of the bezel is prevented by structure other than the gasket thereby preventing undue wear of the gasket.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention concerns a portable timepiece such as wristwatch and pocket watch, and especially relates to a portable timepiece in which a bezel is rotatably attached to a case band. 
   2. Description of the Prior Art 
   The bezel rotatably attached to the case band of the portable timepiece can exhibit various functions by rotating it to be set to an optional position, and can contribute to increase  1 n additive value of the portable timepiece. 
   Heretofore, there is known a wristwatch in which, in order to rotatably attach the bezel to the case band, a step part, to whose inner periphery there is attached a cover glass, is formed in an upper part outer periphery of the case band over its whole periphery, an annular protrusion is formed in an outer periphery of the step part, a protrusion which is formed in an inner periphery of the bezel rotatably fitted to the step part of the case band is engaged from below with the protrusion of the step part outer periphery part to thereby prevent the bezel from disengaging, and an O-ring is interposed between the bezel and the step part (refer to JP-A-10-239454 Gazette (paragraphs 0002–0005, FIG.  19 – FIG. 23 )). 
   In a constitution of the JP-A-10-239454 Gazette, since the O-ring is interposed between the bezel and the step part in order to smoothly rotate the bezel, it is easy to rotation-operate the bezel to a desired position. However, as to the bezel capable of being simply rotation-operated, since its force holding a stationary state with respect to the case band is weak, it is easy that the bezel is carelessly deviated from a rotated position set by a user with effort to a position not desired by the user by an unexpected external factor and a chance. 
   In view of this point, in a case where a frictional resistance force is increased by strengthening a gripping force of the O-ring, the careless or unintended rotation of the bezel can be suppressed. However, reversely to this, in a case where the user rotates the bezel, the rotation of the bezel becomes difficult and thus an operability becomes deteriorated. 
   The problem to be solved by the present invention is to provide a portable timepiece capable of suppressing the fact that the bezel is carelessly rotated and deviated, without impairing the rotation operability of the bezel. 
   SUMMARY OF THE INVENTION 
   In order to solve the above problem, in the present invention, an annular bezel is rotatably disposed around an annular protrusion part of a case band, an annular gasket made of an elastic material, which makes the bezel stationary to a desirable rotated position with respect to the bezel, is interposed between the bezel and the case band under a state giving a frictional force to these, and a holding mechanism which holds the bezel to a stationary state with respect to the bezel and can release this holding state is provided separately from the gasket. 
   In this invention, there is possessed the holding mechanism which holds the bezel rotated by a user to a desired position with respect to the case band to the stationary state at the rotated position. By operating this holding mechanism to thereby exhibit a holding function, it is possible, by restricting the bezel rotated to the desired position, to suppress the fact that this bezel is carelessly rotated by an unexpected external factor and the like to thereby cause a positional deviation. And, in a case where a holding state which makes the bezel stationary is released by operating the holding mechanism, it is possible to rotation-operate the bezel to the desirable rotated position under this released state. By this, it becomes unnecessary to stop the rotation of the bezel by increasing a frictional resistance force of the gasket. Accordingly, since a frictional resistance of the gasket against the rotating operation of the bezel is small, it is possible to move the bezel to the desired position by being lightly rotated. 
   Further, in a preferred mode of the present invention, the holding mechanism possesses a slip-preventing part provided in the case band, a lock member movably provided in the bezel so as to contact with the slip-preventing part, and a holding ring which has an operating face pressing the lock member to the slip-preventing part and is provided so as to be capable of performing a rotating operation. For this reason, by the rotating operation of the holding ring, the lock member can be moved with respect to the bezel through an operating face of the holding ring. With this, it is possible to exhibit a holding function which holds the bezel to the stationary state with respect to the case band by pressing the lock member to the slip-preventing part. Conversely to this, by releasing the pressing by the rotating operation of the holding ring, the function of holding the bezel to the stationary state is released and thus the bezel is made possible to be rotation-operated. It is preferable in a point that the holding mechanism can be operated by the simple rotating operation of the holding ring. 
   Further, in a preferred mode of the present invention, since the holding ring is rotatably supported by the case band, it is preferable in a point that the rotation of the holding ring for making the bezel stationary to the desired position is suppressed from being transmitted to the bezel and thus the bezel is not rotated carelessly. 
   Further, in a preferred mode of the present invention, since the slip-preventing part is formed by a knurled face provided in the case band, it is preferable in a point that a rotation resistance for making the bezel stationary to the desired position can be obtained in such a manner that the lock member does not slip along the case band, without especially requiring a slip-preventing member. 
   Further, in a preferred mode of the present invention, since the slip-preventing part is formed by a hard rubber fixed to the case band, it is preferable in a point that, by obtaining a large frictional resistance between the slip-preventing part and the lock member, the rotation resistance for making the bezel stationary to the desired position can be obtained in such a manner that the lock member does not slip along the case band. 
   Further, in a preferred mode of the present invention, since the holding mechanism has a biasing body which biases the lock member toward the holding ring, it is preferable in a point that, as a holding state of the bezel by the holding mechanism is released, the lock member cab be surely separated from the slip-preventing part and, by this, the lock member can be made so as not to become a hindrance of the rotation when the bezel is rotation-operated. 

   
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
     A preferred form of the present invention is illustrated in the accompanying drawings in which: 
       FIG. 1  is a plan view showing a wristwatch according to a first embodiment of the present invention; 
       FIG. 2  is a sectional view showing a holding mechanism surrounding along a line F 2 —F 2  in  FIG. 1 ; 
       FIG. 3  is a sectional view showing a relation between a slip-preventing part and a lock member of the holding mechanism of  FIG. 2 ; 
       FIG. 4  is a sectional view, which corresponds to  FIG. 2 , showing the holding mechanism surrounding of a wristwatch according to a second embodiment of the present invention; 
       FIG. 5  is a sectional view showing a relation between a slip-preventing part and a lock member of the holding mechanism of  FIG. 4 ; and 
       FIG. 6  is a sectional view, which corresponds to  FIG. 2 , showing the holding mechanism surrounding of a wristwatch according to a third embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   A first embodiment of the present invention is explained with reference to FIG.  1 – FIG. 3 . 
   In  FIG. 1 , a reference numeral  1  denotes a portable timepiece, for example, a wristwatch used by being mounted on an arm. Inside a timepiece exterior packaging assembly  2  that the wristwatch  1  possesses, there are accommodated a dial  10 , a timepiece movement not shown in the drawing, and so forth. As shown in  FIG. 2 , the timepiece exterior packaging assembly  2  possesses a case body in the form of a case band  3  which is annularly made of a metal or a hard synthetic resin and the like. A cover glass  4  is liquid-tightly mounted to one face (front face) in a thickness direction of the case band  3 , and a case back (not shown in the drawing) is detachably mounted to the other face (back face) in the thickness direction of the case band  3 . The dial  10  is visible through the cover glass  4 . 
   As shown in  FIG. 2 , the case band  3  has, in its front side, an annular protrusion part  3   a , an annular exterior packaging shoulder face  3   b  continuous at approximately right angle to a base end of the annular protrusion part  3   a , and a ring-supporting part  3   c  continuous to the exterior packaging shoulder face  3   b . The cover glass  4  is mounted to an inner periphery of the annular protrusion part  3   a . The ring-supporting part  3   c  is protrusively formed, for example, concentrically with and in the same direction as the annular protrusion part  3   a  and, in its inner periphery face, there is formed a female thread part  5 . 
   In an outer periphery face of the annular protrusion part  3   a , there are formed a protrusion  6 , an escape groove  7 , and a slip-preventing part  8  for a later-mentioned holding mechanism  21 , all of which are annularly continuous along their circumferential direction. The outer periphery face of the annular protrusion part  3   a , located in a tip end side of the annular protrusion part  3   a , is used as a gasket-receiving face  9  with the protrusion  6  being made a boundary. The escape groove  7  is formed in a side opposite to the gasket-receiving face  9 , i.e., in a base end side of the annular protrusion part  3   a , with the protrusion  6  being made the boundary. The slip-preventing part  8  is located further in the base end side of the annular protrusion part  3   a  than the gasketreceiving face  9 . 
   The slip-preventing part  8  is made of a knurled face which is formed by working knurled grooves to the outer periphery face of the annular protrusion part  3   a  with using a knurled tool.  FIG. 3  exemplifies the slip-preventing part  8  in which the longitudinal knurled grooves extending in an axial direction while intersecting at right angle to the circumferential direction of the annular protrusion part  3   a  are provided with a constant interval in the circumferential direction of the annular protrusion part  3   a . Since the slip-preventing part  8  is formed by the knurled face which is directly worked in the outer periphery of the annular protrusion part  3   a , no slip-preventing member is required especially. 
   Incidentally, in place of this constitution, the slip-preventing part  8  may be provided in the outer periphery face of the annular protrusion part  3   a  by preparing, separately from the annular protrusion part  3   a , a slip-preventing ring in whose outer periphery there are previously applied the knurled grooves, and fixing this slip-preventing ring to the outer periphery of the annular protrusion part  3   a  by a bonding using an adhesive, a welding or caulking, and the like. 
   As shown in  FIG. 1  and  FIG. 2 , the timepiece exterior packaging assembly  2  possesses a bezel  11  which is rotatably attached to the case band  3  and functions as a decorative ring for instance. The bezel  11  is made of a metal or a synthetic resin etc. in an annular form, and rotatably disposed around the annular protrusion part  3   a.    
   That is, as shown in  FIG. 2 , in an inner periphery of the bezel  11  there are provided, along this inner periphery, an annularly continuing groove ha and an engaging protrusion part  11   b , and a gasket  12  is attached to the groove  11   a . The gasket  12  is made in a ring-like form by an elastic material such as elastomer and synthetic resin. The bezel  11  is attached to the case band  3  by being fitted to an outer periphery of the annular protrusion part  3   a . Under a mounted state of this bezel  11 , the engaging protrusion part  11   b  enters into the escape groove  7  and is hooked to and engages with the protrusion  6 , and the gasket  12  is interposed between the gasket receiving face  9  in the outer periphery of the annular protrusion part  3   a  and an inner periphery of the bezel  11 . By an engagement of the protrusion  6  with the engaging protrusion part  11   b , the bezel  11  is prevented from disengaging. 
   The gasket  12  is elastically deformed in order that the bezel  11  becomes stationary to a desirable rotated position with respect to the case band  3 , thereby giving a frictional resistance force respectively to the outer periphery of the annular protrusion part  3   a  and the inner periphery of the bezel  11 . In  FIG. 1  and  FIG. 2 , a reference numeral  11   c  denotes irregularities, which are formed in an outer periphery face of the bezel  11 , for preventing a finger from slipping. By engaging the finger with the irregularities  11   c  of the bezel  11  and thereby applying a rotation-operating force overcoming the aforesaid frictional resistance force to the bezel  11 , this bezel  11  can be rotated and moved to a desired position. 
   The timepiece external packaging assembly  2  is provided with a holding mechanism  21  which holds the bezel  11  under its stationary state at an optional rotated position and can release this holding state when rotation-operating the bezel  11 . As shown in  FIG. 2 , the holding mechanism  21  possesses the slip-preventing part  8 , a lock member  22 , a holding ring  23 , and a biasing body, e.g., a coil spring  24 . 
   That is, in at least one place, preferably plural places at the same interval in the circumferential direction of the bezel  11 , for example two places corresponding to a radial direction of the bezel  11 , stepped holes or openings  25  (only one is shown in  FIG. 2 ) are opened along the radial direction of the bezel  11 . A lock member  22  (only one is shown in  FIG. 2 ) is inserted through each of these stepped holes  25 . The fact that the lock members  22  are disposed in the plural places in the circumferential direction of the bezel  11  preferably at the same interval is preferable in a point that a balance is good because a prevention of a careless rotation of the bezel  11  by the lock member  22  is performed in the plural places along the circumferential direction of the bezel  11 . 
   The lock member  22  consists of a metal or a hard synthetic resin and, as shown in  FIG. 2  and  FIG. 3 , has, e.g., a pin-like form in which the other end of a shaft-like main part whose one end contacts with the slip-preventing part  8  is provided with a head part  22   a  which is made larger, e.g., a larger diameter, than the main part. The lock member  22  is one functioning as a cam follower, and its head part  22   a  has a cam follower face  22   c . This cam follower face  22   c  is made a hemispherical face for instance. An axial length of the lock member  22  is longer than the stepped hole  25 . 
   Incidentally, the lock member  22  is not limited to the pin-like form, and its main part may have a plate shape extending in the circumferential direction of the bezel  11 . For example, an end face of the lock member  22  that contacts with the slip-preventing part  8  may have a hemispherical shape. However, it is more preferable that, in place of this, the end face is configured as an arc-like face along the outer periphery face of the annular protrusion part  3   a  to thereby increase an area contacting with the slip-preventing part  8 . 
   The holding ring  23  consists of a metal or a hard synthetic resin, and its outer diameter is larger than a maximum diameter of the bezel  11 . As shown in  FIG. 2 , in an outer periphery part of the holding ring  23  there are formed irregularities  26  for preventing the finger from slipping and a male thread part  27  while their positions being deviated in the thickness direction of this ring  23 . The male thread part  27  of the holding ring  23  is meshed with the female thread part  5  of the case band  3 . The holding ring  23  is attached so as to be movable in the thickness direction of the case band  3  by changing this meshing state. Under this attached state, in order that a rotating operation of the holding ring  23  can be performed while suppressing an interference with the bezel  11 , the irregularities  26  are located further radially outwardly than the irregularities  11   c  of the bezel  11 . 
   In an inner periphery of the holding ring  23 , there is formed, e.g., a slanted cam face  28  as an operating face contacting with the head part  22   a  of the lock member  22 . This cam face  28  is continuous in the circumferential direction. The lock member  22  is adapted such that, when the holding ring  23  is rotation-operated in a clamping direction so as to approach the external packaging shoulder face  3   b , the lock member  22  is pressed to the slip-preventing part  8  by the cam face  28 . Incidentally, in  FIG. 2 , a reference mark P exaggeratively denotes an axial direction moving dimension which is given to the lock member  22  by the holding ring  23 . 
   A coil spring  24  is interposed between a step part of the stepped hole  25  and the head part  22   a  of the lock member  22  under a compressed state. By the coil spring  24 , the lock member  22  is biased toward the holding ring  23  such that the head part  22   a  of the lock member  22  maintains the contact with the cam face  28 . 
   In  FIG. 2 , the reference numeral  31  denotes a moderation-exerting mechanism. This moderation-exerting mechanism  31  comprises a plate spring  33  accommodated in an annular groove  32  formed in the case band  3  while being opened to its external packaging shoulder face  3   b , and locking concave parts (only one is shown in the drawing)  34  formed in a back face of the bezel  11  along its circumferential direction at every constant interval. The plate spring  33  has spring pieces  33   b  slantingly cut and raised from plural places of an annular part  33   a  fixed to the groove  32 . A tip part of the spring piece  33   b  is engaged with and disengaged from the locking concave part  34  while accompanying with an elastic deformation of the spring piece  33   b , thereby being capable of giving a click feeling to the rotation operation of the bezel  11 . Incidentally, by taking shapes of the tip part of the spring piece  33   b  and the locking concave part  34  into consideration, it is also possible to regulate the rotation of the bezel  11  under the state of being exerted the moderation to one direction and, further, to allow the rotation in both directions. Further, it is also possible to omit the moderation-exerting mechanism  31 . 
   In the wristwatch  1  having the above constitution, the holding ring  23  is moved in an arrow A direction in  FIG. 2  by manually rotating the holding ring  23  in a loosening direction, i.e., a screw-out direction. With this, the lock member  22  is pressed back by the coil spring  24 , and a state is reached in which the cam face  28  of the holding ring  23  does not press the lock member  22  to the slip-preventing part  8  of the case band  3 , i.e., the contact pressure between the lock member  22  and the slip-preventing part  8  is decreased. In other words, the fact that the bezel  11  under the stationary state is held (fixed) under the stationary state by the holding mechanism  21  is released, so that the bezel  11  becomes in a manually rotatable state. 
   Accordingly, under this rotatable state, it is possible to rotation-operate the bezel  11  to the desirable rotated position with respect to the case band  3  while resisting against the frictional resistance force given by the gasket  12  and the moderation-exerting mechanism  31 . After this rotating operation, by rotation-operating the holding ring  23  of the holding mechanism  21  in the clamping direction, the bezel  11  having been rotated to the desirable position can be held under the stationary state so as not to be moved from that position. 
   That is, the holding ring  23  moves in an arrow B direction in  FIG. 2  by manually rotating the holding ring  23  in a tightening direction, i.e., a screw-in direction, so that it approaches the external packaging shoulder face  3   b  of the case band  3 . For this reason, by the cam face  28  of the holding ring  23  contacting with the head part  22   a  of the lock member  22 , the lock member  22  is pressed to the slip-preventing part  8  in the outer periphery of the annular protrusion part  3   a  thereby increasing the contact pressure between the lock member  22  and the slip-preventing part  8 . This pressed state is maintained so long as the holding ring  23  is not loosened, by the fact that the holding ring  23  is supported while meshing with a ring-supporting part  3   c  of the case band  3 . 
   In the final stage of screwing-in the holding ring  23  in order to fix the bezel  11  in the desired position, a large operating force is applied to the holding ring  23 . However, notwithstanding this, since the holding ring  23  is supported by being meshed with the ring-supporting part  3   c  of the case band  3 , the rotation operating force given to the holding ring  23  is exerted on the case band  3  but not transmitted to the bezel  11 . By this, there is no fear that the bezel  11  is carelessly or accidentally rotated. 
   Under this state, the lock member  22  is interposed between the slip-preventing part  8  and the holding ring  23  and the lock member  22  is strongly pressed to the slip-preventing part  8 , i.e., at a strong contact pressure. For this reason, in a case where an external force which tends to rotate the bezel  11  is applied to it without being desired, the lock member  22  which is suppressed from being deviated in the circumferential direction becomes a stopper by the rotation resistance in the slip-preventing part  8 , so that the bezel  11  is suppressed form carelessly deviating in the circumferential direction of the case band  3 . 
   Like the above, by exhibiting the holding function of the holding mechanism  21  thereby to restrict rotation of the bezel  11  from the desirable position, it is possible to suppress the bezel  11  from being carelessly rotated to thereby cause positional deviation and, in the case where the holding state which makes the bezel  11  stationary is released by reducing the holding function owing to the holding mechanism  21 , it is possible to rotate the bezel  11  to the desirable rotated position under this released state. In these operations, in order to operate the holding mechanism  21 , since it suffices if its holding ring  23  is rotation-operated, the operations are simple. 
   By possessing the holding mechanism  21  of the above constitution, it is unnecessary to excessively increase the frictional resistance force of the gasket  12  in order that the bezel  11  is not rotated carelessly. By this, it is possible to reduce the frictional resistance force of the gasket  12  against the rotating operation of the bezel  11 . Accordingly, it is possible to move the bezel  11  to the desired position by lightly rotating it. 
   In this case, since the lock member  22  is biased toward the holding ring  23  by the coil spring  24 , in accompaniment with the fact that the fixed state in which the bezel  11  is held in the stationary state is released, the lock member  22  can be surely separated from the slip-preventing part  8 . For this reason, when the bezel  11  is rotation-operated, it is possible that the lock member  22  does not become a hindrance of the rotation. 
     FIG. 4  and  FIG. 5  show a second embodiment of the present invention. Since this embodiment is basically the same as the first embodiment, the same reference numeral is applied to a portion having the same constitution or the same function, and explanation thereof is omitted. Hereunder, portions different from the first embodiment are explained. 
   In the second embodiment, the slip-preventing part  8  is formed by a hard rubber layer which is fixed by bonding and the like to an outer periphery of the annular protrusion part  3   a  of the case band  3 . The fact that the slip-preventing part  8  made of the rubber is used like this is preferable in a point that a large rotation resistance for making the bezel  11  stationary in the desired position because a large frictional resistance can be obtained between it and the lock member  22 . 
   Further, in the second embodiment, the ring-supporting part  3   c  is formed by a step part depending from the external packaging shoulder face  3   b  and has, in a standing face of this step part, a protrusion  15  continuous in the circumferential direction. The holding ring  23  has, in its inner periphery face, an engaging protrusion part  16  together with the cam face  28  functioning as the operating face. The engaging protrusion part  16  is continuously provided along the circumferential direction of the holding ring  23  and hooked by the protrusion  15  from below in  FIG. 4 , thereby preventing the holding ring  23  from disengaging. The protrusion  15  and the engaging protrusion part  16  are ones provided in place of the male thread part and the female thread part which mutually mesh in the first embodiment. The holding ring  23  is provided rotatably in the circumferential direction. Incidentally, the rotation of the holding ring  23  may be limited only to a predetermined angle. 
   As shown in  FIG. 5 , the cam face  28  provided in the inner periphery face of the holding ring  23  comprises an arc face  28   a  depicted by the same radius and an escape face  28   b  which has a slanted face  28   b   1  continuous to this arc face  28   a  and in which one part of the inner periphery face of the holding ring  23  is concaved. A separation distance E along a radial direction of the case band  3  between the slip-preventing part  8  and the arc face  28   a  is set shorter than a total length L of the lock member  22  in such a degree as to be enough to sufficiently press the lock member  22  to the slip-preventing part  8 . A separation distance F along the radial direction of the case band  3  between the slip-preventing part  8  and a deepest portion of the escape face  28   b  is set longer than the total length L of the lock member  22 . 
   Owing to such a dimensional relation, under a state that the arc face  28   a  of the cam face  28  contacts with the head part  22   a  of the lock member  22  by the rotating operation of the holding ring  23 , the lock member  22  approaches the annular protrusion part  3   a  and is strongly pressed to the slip-preventing part  8 . For this reason, by restricting rotation of the bezel  11  from the desired position, it is possible to suppress the bezel  11  from being carelessly rotated and causing positional deviation. Further, under a state that the head part  22   a  of the lock member  22  is disposed in the deepest part of the escape face  28   b  of the cam face  28  by the rotating operation of the holding ring  23 , the lock member  22  is moved by the biasing force of the coil spring  24  such that its head part  22   a  contacts with the deepest part of the escape face  28   b . For this reason, it is possible to make the lock member  22  into a state of lightly contacting with the slip-preventing part  8  or to separate the lock member  22  from the slip-preventing part  8 . 
   A constitution other than the point explained above is the same as the first embodiment, including a constitution not shown in  FIG. 4  and  FIG. 5 . Accordingly, also in this second embodiment, the problem of the present invention can be solved by obtaining the actions similar to the first embodiment. Moreover, when rotation-operating the holding ring  23 , since a small rotating amount is suffices, it is preferable. Additionally, in the second embodiment, since the holding ring  23  is supported in its inside by the ring-supporting part  3   c , the irregularities  26  can be provided over the whole outer periphery of the holding ring  23 . For this reason, since the engagement of the user&#39;s finger with respect to the holding ring  23  becomes good and a rotating operability of the holding ring  23  can be improved, it is preferable. 
     FIG. 6  shows a third embodiment of the present invention. Since this embodiment is basically the same as the first embodiment, the same reference numeral is applied to a portion having the same constitution or the same function, and explanation thereof is omitted. Here under, portions different from the first embodiment are explained. 
   In the third embodiment, the bezel  11  has a bezel body  11 C, and a bezel plate  110  fixed to the former from a front side. The bezel plate  110  having the irregularities  11   c  in its outer periphery part is fixed to the bezel body  11 C after the holding ring  23  has been attached to the bezel body  11 C. In the bezel body  11 C there is provided the stepped hole  25  penetrating through in its thickness direction. The bezel body  11 C is one functioning also as the ring-supporting part and, therefor, the male thread part  27  is formed in an outer periphery part of the bezel body  11 C. The female thread part  5  possessed by the holding ring  23  is meshed with the bezel body  11 C, not the case band  3 . For this reason, by rotating the holding ring  23 , this holding ring  23  is moved along the thickness direction of the bezel  11 . 
   The holding ring  23  has an annular presser part  23   a  protruding to an inside of the former. This presser part  23   a  enters into between a face to which an upper end of the stepped hole  25  of the bezel body  11 C opens and the bezel plate  11 D. The operating face  28  consisting of a flat annular face, which is possessed by this presser part  23   a , contacts with the head part  22   a  of the lock member  22  inserted into the stepped hole  25 . Further, the annular slip-preventing part  8  is provided in the external packaging shoulder face  3   b  of the case band  3 . This slip-preventing part  8  consists of a rubber material etc. for instance, and is embedded and fixed in a groove provided in the external packaging shoulder face  3   b . Incidentally, it is also possible to form the slip-preventing part  8  with the knurled face. 
   Like the above, by the relation in which the holding mechanism  21  is provided so as to extend along the thickness direction of the bezel  11  and the case band  3 , the ring-supporting part is not provided in the case band  3 . Further, the moderation-exerting mechanism  31  giving the click feeling to the rotating operation of the bezel  11  regulates the rotation of the bezel  11  under the moderation-exerting state to the rotation in one direction in view of shapes of the tip part of the spring piece  33   b  and the locking concave part  34 . This rotation regulation is for not allowing the rotation of the bezel  11  when the holding ring  23  is rotation-operated so as to approach the external packaging shoulder face  3   b . By this, it is adapted such that the position of the bezel  11  is prevented from deviating in accompaniment with the rotating operation which finally, strongly screws in the holding ring  23  to thereby carelessly rotate the bezel  11 . 
   A constitution other than the point explained above is the same as the first embodiment, including a constitution not shown in  FIG. 6 . Accordingly, also in this third embodiment, the problem of the present invention can be solved by obtaining the actions similar to the first embodiment. Additionally, in the third embodiment, since the holding ring  23  is supported in its inside by the bezel  11 , the irregularities  26  can be provided over the whole outer periphery of the holding ring  23 . For this reason, since the engagement of the user&#39;s finger with respect to the holding ring  23  becomes good and the rotating operability of the holding ring  23  can be improved, it is preferable. Incidentally, in the third embodiment, in a case where such an escape face as explained in the second embodiment is provided in the operating face  28  of the presser part  23   a  of the holding ring  23 , the rotation amount of this holding ring  23  can be reduced when rotation-operating the holding ring  23 . 
   The present invention is not limited to the above-mentioned embodiments. For example, in the first embodiment, it is also possible to perform the operation by disposing the holding mechanism  21  vertically along the thickness direction of the bezel  11  and the case band  3  as explained in the third embodiment, and providing the holding ring  23  having the annular presser part  23   a  so as to be movable in the thickness direction of the case band  3  by being meshed with the thread part of the case band  3 . 
   According to the present invention, since it is adapted such that the rotation of the bezel is restricted by the holding mechanism to thereby suppress the careless rotation of the bezel and the gasket does not bear a function which suppresses the rotation of the bezel, it is possible to provide a portable timepiece capable of suppressing the fact that the bezel is carelessly rotated and deviated, without impairing the rotation operability of the bezel.