Patent ID: 7124481

Claim:
A buckle device ( 1 ) comprising a tongue plate ( 2 ) to be connected to the webbing, and a buckle body ( 5 ) into and from which the tongue plate ( 2 ) is inserted and extracted, wherein the buckle body ( 5 ) comprises: a frame ( 10 ); a hook member ( 20 ) pivotably mounted on the frame ( 10 ), the hook member being adapted to pivot to come into engagement with the tongue plate ( 2 ) upon insertion of the tongue plate ( 2 ) and being pivotally urged in the disengaging direction all the time; a release button ( 50 ) made of plastic and for releasing the engagement between the hook member ( 20 ) and the tongue plate ( 2 ); and a lock bar ( 30 ) adapted to move to a first position, in which the lock bar inhibits pivoting of the hook member ( 20 ) in the disengaging direction, by an urging force of a biasing member when the hook member ( 20 ) is engaged with the tongue plate ( 2 ), and move to a second position, in which the lock bar allows pivoting of the hook member ( 2 ) in the disengagement direction, by being pushed by the release button ( 50 ) upon disengaging operation of the release button ( 50 ): said buckle device is provided with a lock member ( 90 ) which is mounted on said frame ( 10 ) pivotably between a lock position, in which the lock bar ( 30 ) is locked in the first position, and a non-lock position in which the lock bar ( 30 ) is not locked, and a biasing member for elastically urging the lock member ( 90 ) to the non-lock position; in that the lock member ( 90 ) comprises: a base end part ( 91 ) pivotally mounted on the frame ( 10 ); a first engaging part formed in one end thereof; and a second engaging part ( 94 ) faced with the first engaging part ( 93 ) and adequately spaced therefrom to allow for receiving the lock bar ( 30 ); and in that a first position side end part of the lock bar ( 30 ) maintains the lock position abutting with the first engaging part ( 93 ), and the second engaging part ( 94 ) protruding into the movable area of the lock bar ( 30 ) closely faces the lock bar ( 30 ), when the lock member ( 90 ) is in the lock position.