A buckle fastening assembly is adapted for a child safety seat and includes a cushion body whereon a through hole is formed, and a belt body including a protecting pad and a positioning structure. One end of the positioning structure is connected to the cushion body, another end of the positioning structure passes through the through hole to connect with the protecting pad, and the positioning structure biases the protecting pad away from a working position. When the belt body is not in use, the positioning structure can drive the protecting pad away from the working position by elasticity, so as to prevent the protecting pad from randomly falling on an upper surface of the cushion body, which will not affect a child's riding and can improve the riding comfort. The buckle fastening assembly has advantages of simple structure and easy disassembly, which is convenient to use by caregivers.

A belt buckle device (1) for a seat belt including a belt buckle, a drive device (2) coupled or coupleable to the belt buckle, threaded sleeve (5) coupled or coupleable to the belt buckle, a guide part (12) attachable fixed with respect to the vehicle for guiding the threaded sleeve (5) and for supporting the threaded spindle (10), wherein a support plate (9) is provided on the threaded spindle (10) in the axial direction of the threaded spindle (10), which support plate (9) is not displaceable by a tensile force exerted by the belt buckle, via which support plate (9) the threaded spindle (10) is supported in the axial direction on a first thrust support (6) of the guide part (12) to take up tensile forces exerted by the belt buckle.

A tongue mechanism for use in an occupant restraint system also having a buckle mechanism and a webbing. The tongue mechanism includes a tongue member configured to selectively engage the buckle mechanism, a body formed over a portion of the tongue member, a slider, and a biasing member configured to laterally bias the slider. The body includes a body contact surface. The slider includes a slider contact surface and is configured to travel along a track between a first free position and a second locking position. When the slider is positioned in the first free position the tongue mechanism is free to slide along the length of the webbing, and when the slider is positioned in the second locking position a portion of the webbing is clamped between the slider contact surface and the body contact surface thereby preventing the tongue mechanism from sliding along the length of the webbing.

A belt tensioner tightens a belt strap of a vehicle seat belt whose belt buckle tongue, which is arranged movably on the belt strap, is inserted into a belt buckle. The belt buckle is attached to a retaining cable having a cable guide formed in such a way that one length of a guide path of the retaining cable can be extended in the cable guide to tighten the belt strap.

An upper-front of a seatback is cut, providing a hole at a position the occupant's shoulder may lie, and an engaging means able to engage with a shoulder webbing is fitted in the hole. The engaging means holds the shoulder webbing, which is wrapped around the occupant. The engaging means is, for example, a (second) buckle fitted in the hole. A second tongue (intermediate tongue) is mounted on a middle part of the shoulder webbing. The shoulder webbing is wrapped slantwise around the occupant's shoulder when the second tongue is engaged with the second buckle.

A seat belt for a vehicle comprises a first tongue coupled to a first webbing, the first webbing configured to cover portions of a shoulder, a chest, and an abdomen of a passenger; a first buckle coupled to the first tongue; a second tongue coupled to a second webbing, the second webbing configured to cover portions of the abdomen of the passenger; a second buckle coupled to the second tongue; and an actuator configured to upwardly pull the first tongue and the first buckle, wherein the first buckle is coupled to the second buckle; and upon a collision of the vehicle, the actuator operates to separate the first buckle from the second buckle, and the first webbing moves upward, restricting a movement of an upper body of the passenger.

A vehicle occupant restraint system for a seat of a vehicle. The system includes a first arm portion mountable on a first side of the seat, the first arm having an engaging portion; and a second arm portion mountable on a second side of the seat, the second arm having an engaging portion, the engaging portion of the first arm portion being engageable with the engaging portion of the second arm portion to restrain an occupant on the seat. At least one of the first arm portion and the second arm portion is adjustable relative to the seat.

[Object] To effectively reduce a noise generated during engaging operation of a tongue. [Solution] A slider 13 held in a non-locking position, at which the slider 13 does not lock a latch 9, turns together with the latch 9 and moves so as to enter a space between the latch 9 and the locking pin 10 during operation of the latch 9. A front end 13a of the slider 13 comes in contact with a front end 25a.sub.4 of a damper 24 before coming in contact with a stop 11f of an operation button 11, and the slider 13 moves while compressing a damper spring 26. As a result, the movement of the slider 13 is slowed down. When the front end 13a is in contact with the stop 11f, the slider 13 is positioned in a locking position, at which the slider 13 locks the latch 9 positioned in the latching position. The slider 13 that has been slowed down comes in contact with the stop 11f, reducing the noise generated when the tongue engages with the buckle 7.

A seat belt device includes a buckle provided on a side portion of a seat for a vehicle, and configured such that a tongue plate is inserted into the buckle; a buckle force limiter mechanism connected to the buckle via a connecting member having an elongate shape, the buckle force limiter mechanism being configured to allow the buckle to move in a pulling direction when a tensile load equal to or larger than a predetermined tensile load is applied to the buckle; and a case covering the connecting member from an inner side in a seat width direction, the case having a corner at an upper end portion of the case, the corner facing the connecting member, and the corner having an arc shape.

A buckle guide formed in the shape of a cross-sectionally rectangular tube is inserted from a vehicle rear and lower end portion of a buckle cover of a buckle, and guide ribs that project from an inner surface of the buckle cover are in abutting contact with a rectangular guide surface that is an outer surface of the buckle guide. Because of this, swiveling of the buckle cover relative to the buckle guide is limited.