Air belt apparatus for motor vehicle

1. An occupant protection system for a motor vehicle, comprising:

a webbing for occupant restraint corresponding to a chest portion of an occupant;

an expansion portion provided in the webbing for occupant restraint, corresponding to a head portion of the occupant seated in a vehicle seat when in expansion;

an inflator capable of supplying inflation gas into the expansion portion;

a side collision sensor for detecting or predicting a side collision;

a control device for activating the inflator on the basis of an output signal from the side collision sensor; and

a belt guide provided on an inclined portion of a shoulder portion of a seatback in the vehicle seat, and capable of being developed in a direction to be spaced apart from the head portion up to a predetermined angle limited by a stopper mechanism about a fulcrum positioned at an outside in a vehicle-width direction from an ordinary condition in which the webbing for occupant restraint is guided, at a time when the expansion portion is expanded, the belt guide causing the expansion portion to be expanded toward an upper position facing the head portion in the vehicle-width direction while limiting an expanding shape of the expansion portion, and wherein the expansion portion is expanded upward above and out of the belt guide in a vehicle-height direction, and

a cover for covering the expansion portion in a condition being folded back, wherein an upper end side of the cover facing away from the shoulder portion of the seatback at the head portion side is stitched with a tear seam to be ruptured by inflation pressure of the expansion portion.

2. The system of claim 1 , wherein the belt guide comprises a pair of guide members connected to be capable of opening and closing at the fulcrum, and wherein the stopper mechanism is formed of stopper portions provided in the pair of guide members being in contact with each other when the pair of guide members is developed up to the predetermined angle.

3. The system of claim 1 , wherein the belt guide comprises a pair of guide members connected to be capable of opening and closing at the fulcrum, and

when the guide members open, the guide members separate from each other at an end of the belt guide opposite the fulcrum.

4. An air belt apparatus for a motor vehicle, comprising:

a webbing including a portion for restraining the chest of an occupant seated in a vehicle seat;

an expansion portion provided in the webbing for restraining the head of the occupant;

a belt guide provided on an inclined portion of a shoulder portion of a back of the vehicle seat; and

a cover for covering the expansion portion in a folded condition, an upper end side of the head portion side of the cover facing away from the shoulder portion of the back of the vehicle seat is stitched with a tear seam to be ruptured by inflation pressure of the expansion portion, and

wherein the belt guide includes a pivot point that permits the belt guide to separate thereby allowing the expansion portion to expand out from the belt guide into a position alongside the head of the occupant, and wherein the expansion portion is expanded out of the belt guide in a vehicle-height direction.

5. The apparatus of claim 4 , wherein the belt guide includes a top and bottom guide members, and wherein the top guide member pivots away from the bottom guide member to allow the expansion portion to expand out of the belt guide.

6. The apparatus of claim 5 , wherein the pivoting motion of the top guide member is limited so that the top guide member limits an expanding shape of the expansion portion.

7. The apparatus of claim 6 , wherein the guide members include stopper portions configured to contact each other to limit pivoting of the top guide member to a predetermined angle.

8. The apparatus of claim 5 , wherein when the top guide member pivots, the top and bottom guide members separate from each other at an end of the belt guide opposite a pivot point.

9. The apparatus of claim 4 , further comprising an inflator capable of supplying inflation gas into the expansion portion.

10. The apparatus of claim 4 , wherein the pivot point is positioned on an outside of the belt guide in a vehicle-width direction.

11. An air belt apparatus for a motor vehicle, comprising:

a webbing including a portion for restraining the chest of an occupant seated in a vehicle seat;

an expansion portion provided in the webbing for restraining the head of the occupant;

a belt guide provided on an inclined portion of a shoulder portion of a back of the vehicle seat; and

a cover for covering the expansion portion in a folded condition, the cover configured to be ruptured by inflation pressure of the expansion portion, and

wherein the belt guide includes a pivot point that permits the belt guide to separate thereby allowing the expansion portion to expand out from the belt guide into a position alongside the head of the occupant, and wherein the expansion portion is expanded out of the belt guide in a vehicle-height direction.