Abstract: A buckle includes a snap coupling mechanism including a locking element pivotable between a locked and an unlocked position for engaging and disengaging two tongues, respectively; a release button movable between a raised position and a lowered position corresponding to the locked and unlocked positions, respectively; a spring tending to keep the release button in the raised position; and two sliders opposing the insertion of the tongues. The sliders are configured to come between a body of the buckle and the locking element, when the locking element is moved into the unlocked position, so as to prevent the locking element from moving from the unlocked position to the locked position. The release button is connected to the locking element so that when the release button is pressed, the locking element moves into the unlocked position, whereas when the release button is released, the locking element moves into the locked position.

Abstract: A buckle includes a case connected to a restraint system lower belt. A coupling mechanism releasably engages tongue-like coupling elements connected to respective upper belts. An indicator indicates correct belt tensioning and has a visual symbol visible through openings in the case. The indicator moves in the case between a first position in which the visual symbol is not visible, for loose belts, and a second position in which the visual symbol is visible, for correctly tensioned belts. First springs urge the indicator towards the first position. A locking element in the case connects to an end of the lower belt. Second springs between the case and the locking element are resiliently deformed from tension on the lower belt. The locking element cooperates with the indicator so that when the indicator is in the second position, it is locked.

Abstract: A buckle includes a snap coupling mechanism including a locking element pivotable between a locked and an unlocked position for engaging and disengaging two tongues, respectively; a release button movable between a raised position and a lowered position corresponding to the locked and unlocked positions, respectively; a spring tending to keep the release button in the raised position; and two sliders opposing the insertion of the tongues. The sliders are configured to come between a body of the buckle and the locking element, when the locking element is moved into the unlocked position, so as to prevent the locking element from moving from the unlocked position to the locked position. The release button is connected to the locking element so that when the release button is pressed, the locking element moves into the unlocked position, whereas when the release button is released, the locking element moves into the locked position.

Abstract: A buckle includes a case connected to a restraint system lower belt. A coupling mechanism releasably engages tongue-like coupling elements connected to respective upper belts. An indicator indicates correct belt tensioning and has a visual symbol visible through openings in the case. The indicator moves in the case between a first position in which the visual symbol is not visible, for loose belts, and a second position in which the visual symbol is visible, for correctly tensioned belts. First springs urge the indicator towards the first position. A locking element in the case connects to an end of the lower belt. Second springs between the case and the locking element are resiliently deformed from tension on the lower belt. The locking element cooperates with the indicator so that when the indicator is in the second position, it is locked.

Abstract: The buckle includes a metal body and a snap coupling mechanism for releasable connection of a pair of tongue elements to the metal body. The snap coupling mechanism comprises a release button which can be operated by the user to push the tongue elements out of the metal body, a locking plate which can assume a locked position in which it retains the tongue elements in the metal body and a released position in which it disengages the tongue elements from the metal body, a release member which can be operated via the release button to move the locking plate into the released position, and a pair of sliders for resiliently opposing the insertion of the tongue elements into the metal body. According to the invention, the metal body is made as a single sheet metal piece obtained by blanking and folding.