Side curtain air bag

A side curtain airbag, which has chambers expanded by gas supplied from an inflator, and expands and develops in a curtain shape at side part of a vehicle so as to vehicle protect occupants, the side curtain air bag comprising:

• a primary chamber which expands so as to protect an occupant;
• a secondary chamber which applies tension on the side curtain air bag after the side curtain air bag is expanded and developed;
• and
• a set of strings, each having one end attached to the side curtain air bag at a joint end and the other end attached to the vehicle at a fixation end, in a forward and backward direction of the vehicle,
• wherein, the primary chamber has a first opening through which gas is supplied from the inflator, and is expanded by the inflow of the gas from the inflator,
• the secondary chamber has a second opening through which gas is supplied from the inflator, and is expanded by the inflow of the gas from the inflator,
• the second opening is smaller in size than the first opening so that the secondary chamber expands later than the primary chamber,
• when the side curtain air bag is expanded and developed, the primary chamber and the secondary chamber are disposed such that a portion or all of the primary and secondary chambers overlap one of a virtual band region formed of a first virtual line connecting the respective fixation ends of the one set of strings and a second virtual line connecting the respective joint ends of the one set of strings, the virtual band region formed of the first virtual line connecting respective upper ends of attachment parts of the one set of strings and the second virtual line connecting respective lower ends of the attachment parts of the one set of strings, and the virtual band region formed of the first virtual line connecting the upper end of the attachment part of one string and the fixation end of the other string, and the second virtual line connecting the respective lower ends of the attachment parts of the one set of strings, and
• the secondary chamber is provided in a non-inflation part.

A side curtain air bag, which has chambers expanded by gas supplied from an inflator, and expands and develops in a curtain shape at side part of a vehicle so as to protect vehicle occupants, the side air bag comprising:

• a primary chamber which expands so as to protect an occupant;
• a secondary chamber which applies tension on the side curtain air bag after the side curtain air bag is expanded and developed;
• and
• a set of strings, each having one end attached to the side curtain air bag at a joint end and the other end attached to the vehicle at a fixation end, in a forward and backward direction of the vehicle,
• wherein, the primary chamber has a first opening through which gas is supplied from the inflator, and is expanded by the inflow of the gas from the inflator,
• the secondary chamber has a second opening through which gas is supplied from the inflator, and is expanded by the inflow of the gas from the inflator,
• the second opening is smaller in size than the first opening so that the secondary chamber expands later than the primary chamber,
• when the side curtain air bag is expanded and developed, the primary chamber and the secondary chamber are disposed such that a portion or all of the primary and secondary chambers overlap one of a virtual band region formed of a first virtual line connecting the respective fixation ends of the one set of strings and a second virtual line connecting the respective joint ends of the one set of strings, the virtual band region formed of the first virtual line connecting respective upper ends of attachment parts of the one set of strings and the second virtual line connecting respective lower ends of the attachment parts of the one set of strings, and the virtual band region formed of the first virtual line connecting the upper end of the attachment part of one string and the fixation end of the other string, and the second virtual line connecting the respective lower ends of the attachment parts of the one set of strings, and
• at least one secondary chamber is provided in a front non-inflation part or a back non-inflation part of the vehicle.