| 摘要 |
A lifting rod assembly is connected to the support arm and has a body unit, a lifting rod and a friction piece. The body unit has a sleeving hole penetrating from front to back and a connecting hole penetrating the sleeving hole from inside to outside, the sleeving hole is sleeved out of the support arm; the thread of the upper end part of the lifting rod is mounted in the connecting hole of the body; and the friction piece is mounted in the upper end part of the lifting rod and adaptive to the support arm, the compressing level between the friction piece and the support arm can be controlled though the screwing level between the lifting rod and the connecting hole of the body unit.
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