A web length adjuster may include a frame having a base and spaced-apart sidewalls each extending away from the base, a reaction bar mounted to and between the sidewalls and defining a first web clamping surface extending at least partially along a length of the reaction bar between the sidewalls of the frame, and a handle assembly rotatably mounted to and between the sidewalls and defining a second web clamping surface extending at least partially along a length of the handle assembly between the sidewalls of the frame, the handle assembly rotatable relative to the frame between a first position to clamp a web of a vehicle occupant restraint web between the first and second clamping surfaces and a second position to allow the web to pass between the first and second clamping surfaces. The first and second clamping surfaces may define opposite curvatures in transverse cross-section.

A web length adjuster may include a frame having a base and spaced-apart sidewalls each extending away from the base, a reaction bar mounted to and between the sidewalls and defining a first web clamping surface extending at least partially along a length of the reaction bar between the sidewalls of the frame, and a handle assembly rotatably mounted to and between the sidewalls and defining a second web clamping surface extending at least partially along a length of the handle assembly between the sidewalls of the frame, the handle assembly rotatable relative to the frame between a first position to clamp a web of a vehicle occupant restraint web between the first and second clamping surfaces and a second position to allow the web to pass between the first and second clamping surfaces. The first and second clamping surfaces may define opposite curvatures in transverse cross-section.

An extension unit includes a buckle member, a first coupling member, a second coupling member, and a webbing belt. The buckle member is engaged with a first tongue plate of a seat belt apparatus, includes a first holder holding the webbing belt, and a fixing member fixing an end of the webbing belt. The second coupling member is disposed between the buckle member and the first coupling member and coupled to the first coupling member. The webbing belt joins the buckle member and the first coupling member. The second coupling member is so disposed that a projected region extending inward in a vehicle width direction is defined. The projected region has a size corresponding to a thickness of an operator's hand and is not overlapped with the buckle member. The second coupling member includes a second holder holding the webbing belt extending from the first holder to the fixing member.

An extension unit includes a buckle member, a first coupling member, a second coupling member, and a webbing belt. The buckle member is engaged with a first tongue plate of a seat belt apparatus, includes a first holder holding the webbing belt, and a fixing member fixing an end of the webbing belt. The second coupling member is disposed between the buckle member and the first coupling member and coupled to the first coupling member. The webbing belt joins the buckle member and the first coupling member. The second coupling member is so disposed that a projected region extending inward in a vehicle width direction is defined. The projected region has a size corresponding to a thickness of an operator's hand and is not overlapped with the buckle member. The second coupling member includes a second holder holding the webbing belt extending from the first holder to the fixing member.

Disclosed are embodiments of passenger seats equipped with seat belts for mitigating seat damage and spinal tension from free-flail movements. In embodiments, the assembly includes a seat back, a first slip ring positioned proximate a top of the seat back, a second slip ring positioned lower on the seat back, a retractor, and a webbing threaded through each of the first and second slip rings. During normal use of the seat the first slip ring forms a first pivot for the webbing, and during a qualifying deceleration event the second slip ring forms a new pivot for the webbing lower on the seat back. In a further embodiment, first and second webbings form primary and auxiliary restraints guided by respective first and second pivots.

Disclosed are embodiments of passenger seats equipped with seat belts for mitigating seat damage and spinal tension from free-flail movements. In embodiments, the assembly includes a seat back, a first slip ring positioned proximate a top of the seat back, a second slip ring positioned lower on the seat back, a retractor, and a webbing threaded through each of the first and second slip rings. During normal use of the seat the first slip ring forms a first pivot for the webbing, and during a qualifying deceleration event the second slip ring forms a new pivot for the webbing lower on the seat back. In a further embodiment, first and second webbings form primary and auxiliary restraints guided by respective first and second pivots.

Disclosed are embodiments of passenger seats equipped with seat belts for mitigating seat damage and spinal tension from free-flail movements. In embodiments, the assembly includes a seat back, a first slip ring positioned proximate a top of the seat back, a second slip ring positioned lower on the seat back, a retractor, and a webbing threaded through each of the first and second slip rings. During normal use of the seat the first slip ring forms a first pivot for the webbing, and during a qualifying deceleration event the second slip ring forms a new pivot for the webbing lower on the seat back. In a further embodiment, first and second webbings form primary and auxiliary restraints guided by respective first and second pivots.

Disclosed are embodiments of passenger seats equipped with seat belts for mitigating seat damage and spinal tension from free-flail movements. In embodiments, the assembly includes a seat back, a first slip ring positioned proximate a top of the seat back, a second slip ring positioned lower on the seat back, a retractor, and a webbing threaded through each of the first and second slip rings. During normal use of the seat the first slip ring forms a first pivot for the webbing, and during a qualifying deceleration event the second slip ring forms a new pivot for the webbing lower on the seat back. In a further embodiment, first and second webbings form primary and auxiliary restraints guided by respective first and second pivots.

A seat belt attachment device is an integral body having a buckle component which has a tongue fastening mechanism configured to connect with the seat belt tongue of an existing seat belt system. An attachment tongue extends from the buckle component and is designed to connect with the seat belt connector of the existing seat belt system. At least one rigid bar extends outwardly from the buckle component such that when the seat belt buckle connector and the seat belt tongue are connected to the tongue fastening mechanism and the attachment tongue, the attachment device is located between the seat belt buckle connector and the seat belt tongue and the seat belt strap can be custom wrapped around the rigid bar in order to configure the strap comfortably away from and around the body of the occupant.

A seat belt attachment device is an integral body having a buckle component which has a tongue fastening mechanism configured to connect with the seat belt tongue of an existing seat belt system. An attachment tongue extends from the buckle component and is designed to connect with the seat belt connector of the existing seat belt system. At least one rigid bar extends outwardly from the buckle component such that when the seat belt buckle connector and the seat belt tongue are connected to the tongue fastening mechanism and the attachment tongue, the attachment device is located between the seat belt buckle connector and the seat belt tongue and the seat belt strap can be custom wrapped around the rigid bar in order to configure the strap comfortably away from and around the body of the occupant.