Buckle, injection molding die and injection molding method

A side-release buckle, comprising:

• a plug;
• a socket, the plug and the socket being engaged in a predetermined engagement direction;
• and
• a lock mechanism for maintaining the plug and the socket in engagement in a releasable manner, wherein
• the plug and the socket have a first direction orthogonal to the engagement direction and a second direction orthogonal to both of the engagement direction and the first direction,
• the socket has an insertion opening and a cavity extending from the insertion opening toward inside of the socket,
• the plug has a pair of lock arms extending in the engagement direction, the pair of lock arms opposing in the first direction,
• the lock mechanism has an arm-side lock member formed on each lock arm and a socket-side lock member formed on the socket,
• at least one of the arm-side lock member and the socket-side lock member is a slant surface contactable with the other,
• the slant surface has a back side in the engagement direction continuous with an outer surface of the socket and a front side in the engagement direction positioned inside the socket, the slant surface being slanted relative to the engagement direction, the first direction, and the second direction,
• the slant of the slant surface being formed such that a tip end in the engagement direction is disposed inside the socket.

A buckle, comprising:

• a plug;
• and
• a socket having a front side and a rear side, the plug and the socket being engageable with and releasable from each other, wherein
• the plug has a guide bar to be inserted in the socket, and
• the guide bar has an abutting section to be in slidable contact with the socket and a non-abutting section not to be in slidable contact with the socket, the abutting section being a to-be-held section and a sub to-be-held section that are formed on the guide bar, the non-abutting section being a dent formed between the to-be-held section and the sub to-be-held section,
• the plug has an attachment for holding a tape object,
• the socket has an attachment to be fixed on a surface of another article, and
• the guide bar has a substantially flat side near the front side, and the dent is provided on a side near the rear side, the dent extending the width of the guide bar, and the dent preventing interference with the rear side of the socket when the guide bar is slidably engaged within the socket.