| 摘要 |
PROBLEM TO BE SOLVED: To simplify movement and operation by making a seat one body and providing a spring room, and to always integrating the groove of the stem of a foundation main body and the projection of the seat by the tension of a spring so as to make the structure lower the seat by the weight of a person when he/she sits down on the chair and removing the projection part of the seat from the groove of the stem to turn the seat. SOLUTION: A stem main body 2 is inserted to the center of the seat main body 1. At the time, a seat rotation preventing projection and the seat rotation preventing groove are fitted to each other and inserted from their upper side. A rear seat is placed on a plane, a spring room 5 with a split is housed, a rotating ball is housed in it, a spring 6 is housed in the main body 2 and a plane part at the upper part of an adjusting hardware 4 is housed in contact with the spring 6. The foundation main body 3 is screwed into the main body 2 to fix the whole of the main body 2 with a stem fixing crown nut while looking at the main body 1 and a parallel degree. When the user sits on the main body 1 and his/her weight is applied to it, the projection of the main body 1 is automatically detached from the groove. |
