A system includes a pillar and a seatbelt retractor. The system includes a D-ring supported by and vertically movable relative to the pillar. The system includes a webbing extending from the seatbelt retractor and through the D-ring, The system includes an actuator operatively coupled to the D-ring to vertically move the D-ring relative to the pillar. The system includes a computer having a processor and a memory storing instructions executable by the processor to determine that the seatbelt retractor in a nuisance locked state, and in response determining that the seatbelt retractor is in the nuisance locked state, command the actuator to move the D-ring vertically downward relative to the pillar.

Shock absorbing seatbelt height adjusters for use with vehicle occupant restraint systems, and associated systems and methods are disclosed herein. In one embodiment, a shock absorbing height adjuster includes a D-loop assembly slidably coupled to a rail, and a stop assembly and a pre-loader slidably coupled to the rail on opposite sides of the D-loop assembly. The stop assembly and the pre-loader can be releasably lockable at a plurality of positions along the rail. A biasing member can be compressed between the pre-loader and the D-loop assembly to urge the D-loop assembly toward the stop assembly and allow motion of the D-loop assembly toward the pre-loader under load. The position of the pre-loader can be adjusted to vary the compression in the biasing member.

A height adjustment device for a belt deflector having a guide rail (10) which has a C-shaped cross section with a base (11) and two side limbs (13) which project in the same direction from the base (11), a carriage (20) which is guided in the guide rail (10) such that it can be displaced and fixed, and a return spring (70) which is fastened to the carriage (20) and is guided within the guide rail (10). At least one of the side limbs (13) having at least one spacer element (15) for spacing the return spring (70) away from the side limb (13).

An anchorage system includes an elongate track defining an interior channel and an anchorage device securable at any of plural longitudinal positions on the track. The track has a base and first and second sides. A longitudinal channel opening opens in an outward face of the track and is defined between first and second retaining flanges at the outward face. The flanges project in towards one another and overlay the interior channel. The flanges have edge faces directed laterally towards one another across the channel opening and outward surfaces which are comprised in the outward face of the track. The anchorage device has a body, a retaining foot and a stem portion connecting the body and the retaining foot. The foot is laterally wider than the stem portion, and the anchorage device is engageable in the track with the foot in the interior channel.

An anchor position adjustment device includes a guide rail having a plurality of engagement recess portions formed to be arranged, a moving member attached to the guide rail, a lock pin-provided in the moving member, a first biasing member biasing the lock pin in an inserting direction of the lock pin with respect to the engagement recess portions, a release pin extending from the lock pin, and an operation member attached to the moving member in a slidable manner. The operation member has a release inclination surface guiding the release pin in a pulling direction of the lock pin with respect to the engagement recess portions in accordance with sliding of the operation member, and a release inhibition surface inhibiting the lock pin from being pulled out from the engagement recess portion in a pre-slide state.

Shock absorbing seat belt height adjusters for use with vehicle occupant restraint systems, and associated systems and methods. In one embodiment, a shock absorbing height adjuster includes an adjustable D-ring that is operably coupled to an anchor point on a vehicle frame near a seat occupant's shoulder. The height adjuster can include an anti-cinch feature that enables the D-ring to elastically respond to tension loads in a shoulder web portion of the occupant restraint through at least an initial portion of D-ring movement.

A seatbelt height adjuster includes a track, a slider slidably coupled to the track, slots in one of the track and the slider and teeth on the other of the track and the slider. The teeth are selectively engageable with the slots. The seatbelt height adjuster includes a D-ring supported by the slider and leaf springs disposed on opposite sides of the slider. The leaf springs are each engaged with the track and biasing the slider in opposite directions.

A seatbelt height adjuster includes a track, a slider slidably coupled to the track, slots in one of the track and the slider and teeth on the other of the track and the slider. The teeth are selectively engageable with the slots. The seatbelt height adjuster includes a D-ring supported by the slider and leaf springs disposed on opposite sides of the slider. The leaf springs are each engaged with the track and biasing the slider in opposite directions.

A seat belt adjustment release mechanism includes a carrier and a guide piece that is vertically slidable on the carrier. The guide piece includes an aperture configured to receive a seat belt there through and a spring-loaded button anchored on a pivot. The spring-loaded button, when pressed, is rotatable about the pivot between a home position and a depressed position for actuating a seat belt guide release lever.

An anchor position adjustment device includes a guide rail having a plurality of engagement recess portions formed to be arranged, a moving member attached to the guide rail, a lock pin-provided in the moving member, a first biasing member biasing the lock pin in an inserting direction of the lock pin with respect to the engagement recess portions, a release pin extending from the lock pin, and an operation member attached to the moving member in a slidable manner. The operation member has a release inclination surface guiding the release pin in a pulling direction of the lock pin with respect to the engagement recess portions in accordance with sliding of the operation member, and a release inhibition surface inhibiting the lock pin from being pulled out from the engagement recess portion in a pre-slide state.