Seat belt buckle

A seat belt buckle for engaging a tongue piece (1), characterized in that side walls (7,7') are integrally formed to rise from both sides of a base plate (2');

• upper parts of said side walls (7, 7') are bent inwardly to form flanges (8, 8');
• one end of said base plate (2') is erected upwardly and inwardly to delineate a tongue insertion opening (13) with respect to said flanges (8, 8');
• a push plate is mounted on the tongue piece insertion opening (13);
• both ends of bent portion (17) of a latch plate (3) of the shape of a hook in cross section having a tongue engaging part (15') at the bottom of the lower side and pressure receiving parts (16, 16') at the front end forming said hook, are latched to notched parts (9, 9') in said flanges (8, 8') of a frame (2) equipped with cover engaging parts (10, 10', 11, 11') and notched parts (9,9') at near the center thereof;
• the lower side of a multi-function spring (4) is inserted between said latch plate (3) and said base plate (2'), said multi-function spring (4) being made of a stepped and resilient thin plate having on the lower side springs (20, 20') to push up the latch plate and parts (22, 22') to press the latch plate sidewardly, engaging springs (24, 24') at the upper side, and at a middle stage a tongue piece ejecting spring (23) as well as springs (21, 21') to push the latch plate forwardly, in order that the latch plate (3) is resiliently held in various directions such as forward, upward and inward directions;
• a curved support point (30) is engaged with engaging parts (10, 10') of flanges (8, 8') of said frame (2) and a push plate (5) is provided to press the pressure receiving parts (16, 16') of the latch plate (3) in a manner that the upper surface of the pressure receiving parts (16, 16') of the latch plate (3) is covered;
• and the upper surface thereof is covered with a cover (6) except for push part (29).