Clasp and timepiece

Abstract

A clasp includes a coupling member having an engaged portion and a clasp main body, in which the clasp main body includes an engagement member, an operation member, and a lock member, the engagement member is configured to be engaged with an engaged portion without operating the operation member in a state where the engagement member is not engaged with the engaged portion, an engagement is released by moving the engagement member to a release position by the operation member in a state where the engagement member is engaged with the engaged portion, and when the lock member is moved to the operation restriction position, the engagement member is restricted from being moved to the release position by the operation member.

1 . A clasp that couples a first band and a second band, the clasp comprising:
 a coupling member coupled to a first band side and including an engaged portion; and   a clasp main body coupled to a second band side, wherein   the clasp main body includes
 an engagement member configured to move to an engagement position where the engagement member is configured to engage with the engaged portion and a release position where the engagement member is configured to release an engagement with the engaged portion, 
 an operation member that moves the engagement member from the engagement position to the release position, and 
 a lock member configured to move to an operation restriction position where an operation of the operation member is restricted and an operation permission position where the operation of the operation member is permitted, 
   regardless of whether the lock member is in the operation restriction position or the operation permission position,   the engagement member is configured to be engaged with the engaged portion without operating the operation member in a state where the engagement member is not engaged with the engaged portion, and   the engagement is released by moving the engagement member to the release position by the operation member in a state where the engagement member is engaged with the engaged portion, and   when the lock member is moved to the operation restriction position, the engagement member is restricted from being moved to the release position by the operation member.   
     
     
         2 . The clasp according to  claim 1 , wherein
 the clasp main body includes a biasing member that biases the engagement member to an engagement position side, and   at least one of the engaged portion and the engagement member has a guide surface that moves the engagement member from the engagement position to the release position against a biasing force of the biasing member when the engagement member abuts on the engaged portion.   
     
     
         3 . The clasp according to  claim 1 , wherein
 the lock member includes a positioning portion,   the engagement member includes a holding portion with which the positioning portion is engaged, and   the lock member is held at the operation restriction position by the positioning portion being engaged with the holding portion.   
     
     
         4 . The clasp according to  claim 1 , wherein
 the lock member includes a movement operation member operated by a user, and   the movement operation member includes a logo display portion on which a logo is displayed.   
     
     
         5 . The clasp according to  claim 1 , wherein
 the lock member is moved in a coupling direction in which the clasp main body and the first band are coupled.   
     
     
         6 . The clasp according to  claim 1 , wherein
 the engagement member includes a pair of slide plates disposed to sandwich the engaged portion,   the operation member includes a pair of push buttons that abuts on the slide plates,   the slide plate includes a main body portion that abuts on the push button, an engagement portion disposed to sandwich the engaged portion, and a coupling portion that couples the main body portion and the engagement portion,   the engagement portion of one slide plate is disposed between the main body portion and the engagement portion of another slide plate,   a coil spring that biases the slide plates in a direction in which the slide plates are separated from each other and brings the engagement portions closer to each other is disposed between the pair of slide plates, and   the lock member includes a restriction portion disposed between the main body portion of the slide plate and the push button to restrict a push operation of the push button when the lock member moves to the operation restriction position.   
     
     
         7 . The clasp according to  claim 6 , wherein
 the main body portion of the slide plate includes a first recessed groove portion that holds the restriction portion at the operation restriction position and a second recessed groove portion that holds the restriction portion at the operation permission position, and   in the push button, a storage groove in which the restriction portion is stored is formed at a position facing the second recessed groove portion when the push button is pushed in a state where the restriction portion is disposed in the second recessed groove portion.   
     
     
         8 . A timepiece band comprising:
 the clasp according to  claim 1 ; and   the first band and the second band that are coupled to the clasp.   
     
     
         9 . A timepiece comprising:
 the clasp according to  claim 1 ;   the first band and the second band that are coupled to the clasp; and   
       an exterior case that is coupled to the first band and the second band.