Patent ID: 7980635

Claim:
An auxiliary mechanism for a seat belt apparatus including a belt-like webbing, which is drawn out from near an upper portion of a seat back of a vehicle seat so as to restrain a passenger seated on the vehicle seat, a tongue plate, which is arranged on the webbing so as to be movable along a longitudinal direction of the webbing, and a buckle, which is engaged with the tongue plate, the auxiliary mechanism comprising: a support portion which supports the webbing above the tongue plate so that the webbing is drawable toward the front of the seat back along a longitudinal direction of the webbing, in which the support portion is movable between a storage position located near the seat back and a projection position spaced further apart from the seat back than the storage position to draw out the webbing toward the front of the seat back; and a guide portion fixed to the inside of the seat back and coupled with the support portion, the guide portion guiding the movement of the support portion between the storage position and the projection position and then continuously guiding the movement of the support portion along a vertical direction of the seat back at the storage position, wherein the support portion includes: an angle coupled to the guide portion so as to be movable relative to the guide portion; and a support member arranged on a distal portion of the angle to drawable support the webbing; wherein the guide portion includes: a guide plate including an actuation guide portion which has an adjustment actuation portion and an assistance actuation portion, an intermediate guide portion, which has an adjustment intermediate portion and an assistance intermediate portion, the adjustment actuation portion extending so as to follow undulations on a front surface of the seat back, the assistance actuation portion extending continuously from the adjustment actuation portion, the adjustment intermediate portion being shaped identically to the adjustment actuation portion and spaced from the adjustment actuation portion by a first predetermined distance so that the angle moves while keeping the posture of the angle in a state where the support portion is located in the storage position, and the assistance intermediate portion extending continuously from the adjustment intermediate portion and spaced from the assistance actuation portion; and wherein an actuation engagement member is movable in the direction the actuation guide portion extends and is engaged with the actuation guide portion; an intermediate engagement member is movable in the direction the intermediate guide portion extends and engaged with the intermediate guide portion; the actuation engagement member and the intermediate engagement member are fixed to a basal portion of the angle in a state spaced apart from each other by the first predetermined distance to couple the guide plate and the angle.