| 摘要 |
PURPOSE: A height adjustable apparatus of stand is provided to reduce production costs while having a simple structure. CONSTITUTION: A cup(104) is inserted into at least one hole(103) which is formed on an upper member(102). A spring(105) is mounted within each cup. A ball (106) is placed on each spring. A cover(107) is combined with each cup and has a hole at the center. A part of ball is exposed to outside of the hole of each cover through the elastic force of each spring. Exposed each ball is contacted with a lower member to generate frictional force and control the height of the upper member of a stand. |
