| 摘要 |
PURPOSE: To make the type of a seat possible to suit individual request of users by equipped a joint joining part with a double hinge device where the upper part and lower part are coupled together and which forms part of the lower part, coupling the upper part of a back column member with the first hinge, and coupling a fixing member with the second hinge. CONSTITUTION: A seat supporting member 15 is coupled with a back column member 10 by a tab member and a groove device, and a hinge 14 is equipped with a main part 25 penetrated by a groove 26, which is arranged as receiving the tab member form the seat supporting member. The hinge has two side arms 27, which are penetrated by two sets of holes 28 so as to support two shafts 29 and 30. The upper part of the shaft 29 is coupled with the hinge, and the shaft 30 couples a fixing member 13 with the hinge. According to this structure, the fixing member and the upper part are rotatable round the shafts freely. This is applicable to a mobile chair in which the seat back can move relative to the seat bottom or a mobile chair which has a seat back part and a seat bottom part formed as two separated members. |
