Buckle for restraint belts, particularly for car safety seats for children

摘要

The buckle (12) comprises an inner body (22) adapted to receive portions (16) of a pair of tongues (14) and a snap coupling mechanism (44, 58, 66, 70, 80) adapted to releasably connect the tongues (14) to the inner body (22). The inner body (22) has a through opening (38) through which said portions (16) of the tongues (14) are insertable along a direction of insertion (x). The snap coupling mechanism (44, 58, 66, 70, 80) comprises: a locking element (44) supported by the inner body (22) so as to pivot about a first pivot axis (y) perpendicular to the direction of insertion (x) between a lock position, in which it engages the tongues (14), and an unlock position, in which it disengages the tongues (14); a release button (70) movable between a raised position and a lowered position corresponding to the lock and unlock positions of the locking element (44), respectively; a spring (80) adapted to apply on the release button (70) a resilient force tending to keep it in the raised position; a pair of sliders (58) mounted in the inner body (22) so as to be movable parallel to the direction of insertion (x) to oppose the insertion of the tongues (14) into the inner body (22); and a pair of springs (66) operatively associated to the sliders (58) to apply on these latter a resilient force directed in the opposite direction with respect to the direction of insertion of the tongues (14) into the inner body (22), i.e. in the direction of ejection of the tongues (14) from the inner body (22). The sliders (58) are configured to come, under the action of the respective springs (66), between the inner body (22) and the locking element (44), when this latter is moved into the unlock position, so as to prevent the locking element (44) from moving from the unlock position to the lock position. The release button (70) and the locking element (44) are connected to each other in such a manner that when the release button (70) is pressed and then moved into the lowered position, the locking element (44) moves into the unlock position, whereas when the release button (70) is released, and hence gets back into the raised position due to the resilient action applied thereon by said first resilient means (80), the locking element (44) is pulled by the release button (70) into the lock position.