Vehicle occupant restraint device

1. A vehicle occupant restraint device, comprising:

a three point seatbelt device that includes shoulder webbing running from one end side, in a seat width direction, of an upper section of a seatback toward a buckle at another end side, in the seat width direction, of a lower section of the seatback;

a shoulder webbing anchor that is provided at the one end side of the upper section of the seatback and through which the shoulder webbing is inserted; and

a mover device that moves the shoulder webbing anchor toward a seat width direction outer side of the seatback when the seatback, which is configured to recline from an upright state, is reclined by at least a predetermined angle or greater with respect to a vertical direction,

wherein the mover device includes (i) a push-pull wire, which couples together the shoulder webbing anchor and a portion of a seat cushion, and (ii) a biasing member that uses spring force to bias the shoulder webbing anchor toward a seat width direction inner side of the seatback; and

wherein the push-pull wire of the mover device comprises: an outer tube extending vertically and being located inside the seatback; and an inner wire connecting the shoulder webbing anchor and a part of the seat cushion while being inserted into the outer tube, the inner wire being further configured to be movable in the outer tube according to an inclination angle of the seatback with respect to the vertical direction.

2. The vehicle occupant restraint device according to claim 1 , wherein:

the mover device further comprises (i) a guide section provided at a side portion of the seat cushion and (ii) a guide plate provided at a lower end portion of the seatback and disposed at an upper side of the guide section;

a terminal portion of the inner wire is connected to the seat cushion;

the inner wire is inserted between the guide section and the guide plate on an upper side of the terminal portion; and

the guide plate moves relative to the guide portion according to the inclination angle of the seatback to guide the movement of the inner wire.

3. A vehicle occupant restraint device, comprising:

a three point seatbelt device that includes shoulder webbing running from one end side, in a seat width direction, of an upper section of a seatback toward a buckle at another end side, in the seat width direction, of a lower section of the seatback;

a shoulder webbing anchor that is provided at the one end side of the upper section of the seatback and through which the shoulder webbing is inserted; and

a mover device that moves the shoulder webbing anchor toward a seat width direction outer side of the seatback when the seatback, which is configured to recline from an upright state, is reclined by at least a predetermined angle or greater with respect to a vertical direction, wherein:

the mover device includes an electrical adjustment device that moves the shoulder webbing anchor in conjunction with reclining of the seatback;

a movement amount of the shoulder webbing anchor toward the seat width direction outer side increases in conjunction with an increase in an angle at which the seatback is reclined with respect to the vertical direction;

the electrical adjustment device includes a detection sensor configured to detect a physical amount for use in estimating, based on a detection value detected by the detection sensor, a shoulder height position, of an occupant seated in a vehicle seat, with respect to the seatback; and

the predetermined angle of the seatback with respect to the vertical direction at which the electrical adjustment device is to be actuated is changed in accordance with the estimated shoulder height position.

4. The vehicle occupant restraint device of claim 3 , wherein

the electrical adjustment device determines a size of a physique of the occupant based on the estimated shoulder height position, and

a threshold value of the predetermined angle of the seatback with respect to the vertical direction, at which the electrical adjustment device is to be actuated, is configured to be directly proportional to the determined size of the occupant's physique.