Buckle arrangement for seat belts

A buckle arrangement for a seat belt comprising:

• a frame member;
• a tongue portion having an inserting end, insertable into said frame member in an insertion direction and withdrawable from said frame member in a withdrawal direction;
• a locking member having contact portions, movably disposed on said frame member for movement into a locking position in which said tongue portion is locked in said frame member upon insertion of said tongue portion into said frame member, and for movement from said locking position in a direction of unlocking to unlock said tongue portion from said frame member;
• said tongue portion having engaging means, formed at said inserting end, for selective engagement of said tongue portion with and disengagement of said tongue portion form said locking member;
• means for moving said locking member form said locking position in said direction of unlocking;
• and
• a retaining plate having a plate-like surface, provided on said frame member for retaining said locking member in said locking position, said retaining plate having portions inclined to said plate-like surface for contact with said contact portions of said locking member, such that said retaining plate exerts a component force in said withdrawal direction on said tongue portion.