Air bag with pressurization space

Abstract

An air bag includes two inner sheets facing each other, two outer sheets located at an outer side of the two inner sheets, heat resistance material located at an inner side of any one inner sheet, a first thermal bonding line thermally bonding the two outer sheets to form air input channel, a second thermal bonding line thermally bonding the inner and outer sheets along the material with gap from the first thermal bonding line, and third thermal bonding lines extending from the second thermal bonding line oppositely to the air input channel to form air pillars, a second thermal bonding portion being formed to cross the third thermal bonding lines to thermally bond the two inner and outer sheets to form a pressurization space between the second thermal bonding portion and line, and the second thermal bonding portion being spaced apart from adjacent second thermal bonding portion to form a second passage.

1 . An air bag, comprising:
 two inner sheets positioned to face each other;   two outer sheets respectively located at an outer side of the two inner sheets;   a heat resistance material located at an inner side of the two inner sheets and applied to any one of the inner sheets;   a first thermal bonding line for thermally bonding the two outer sheets to form an air input channel;   a second thermal bonding line for thermally bonding the inner sheets and the outer sheets along the heat resistance material with a gap from the first thermal bonding line; and   third thermal bonding lines extending from the second thermal bonding line in a direction opposite to the air input channel to form air pillars,   wherein a second thermal bonding portion is formed at the third thermal bonding lines in a crossing direction thereof to thermally bond the two inner sheets and the two outer sheets such that a pressurization space is formed between the second thermal bonding portion and the second thermal bonding line, and the second thermal bonding portion is spaced apart from a second thermal bonding portion extending from another adjacent third thermal bonding line to form a second passage.   
   
   
       2 . The air bag according to  claim 1 ,
 wherein fourth thermal bonding lines with a length smaller than an interval between the third thermal bonding lines extend from the third thermal bonding lines in a lateral direction, and   wherein the fourth thermal bonding lines thermally bond the two inner sheets to any one of the outer sheets, and the fourth thermal bonding lines are formed at an opposite side to the second thermal bonding line with respect to the second thermal bonding portion.   
   
   
       3 . The air bag according to  claim 1 , wherein the heat resistance material is continuously applied to the inner sheets in a length direction, and the second thermal bonding line thermally bonds the inner sheets and the outer sheets along the heat resistance material. 
   
   
       4 . The air bag according to  claim 1 ,
 wherein a plurality of first thermal bonding portions are formed in the air input channel in correspondence to the third thermal bonding lines, respectively, such that adjacent first thermal bonding portions are spaced apart from each other to form a first passage, and   wherein a part of the first thermal bonding portions thermally bond the two outer sheets, and the other part of the first thermal bonding portions thermally bond the outer sheets to the inner sheets.   
   
   
       5 . The air bag according to  claim 1 , wherein at least one thermal bonding point for thermally bonding the two outer sheets in a direction perpendicular to the air pillars is formed at a middle of each air pillar in a length direction thereof. 
   
   
       6 . The air bag according to  claim 1 , wherein both ends of the air input channel are closed, and a cock is formed at any one of the outer sheets corresponding to the air input channel.