| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a back patch of a backpack, which is easily adjusted to be raised so as to be fitted along the back of a user, which satisfactorily makes the raised part to be adjusted without causing defective products when a cushioning material is molded and pressed so as to be covered with an exterior fabric and which, by studying the position and height of the raised part of the back patch by individual height as required for obtaining a vertical state when the backpack is shouldered, makes the backpack properly adhere to the back when the backpack is shouldered by a user, and provides a snug touch to the back, causing no pain because a portion with no cushioning material arranged hardly comes into contact with the back, and producing a feeling of light weight from the backpack bag shouldered. <P>SOLUTION: The cushioning material 6 is configured to have layered combination of a foam 6a of a high expansion ratio and a foam 6b of a low expansion ratio. <P>COPYRIGHT: (C)2012,JPO&INPIT |
