| 摘要 |
An object of the present invention is to provide a resin molded parts lock mechanism which can enhance the lock holding force as designed even when a slight deformation or dimension error is produced at the time of molding. A first projecting portion (12) for temporary locking is formed on a first inner wall surface (11b) of wall surfaces of a lock hole (11) which face each other in a position lying close to an entrance (11a) so as to project therefrom, and a second projecting portion (13) for permanent locking is formed on a second inner wall surface (11c) in a position lying deeper than the first projecting portion (12) so as to project therefrom. A permanent locking projection (23) is provided on a first side surface (21 a) of a lock arm (21) in a position lying at a distal end of the lock arm (21) to face the second projecting portion (13) so as to project therefrom, the permanent locking projection (23) being adapted to ride over the second projecting portion (13) due to flexure of the lock arm (21) in association with an inserting operation thereof and then to be brought into engagement with the second projecting portion (13) in a position where the permanent locking projection (23) has ridden over the second projecting portion (13), and a temporary locking projection (22) is provided on a second side surface (21 b) of the lock arm (21) so as to project therefrom. When the permanent locking projection (23) is in engagement with the second projecting portion (13), the first projecting portion (12) presses against the second side surface (21 b) of the lock arm (21) to thereby impart a reaction force directed towards the second projecting portion (13) to the lock arm (21). |
