| 摘要 |
A positioning device includes a knob having a receiving tube and a positioning tube extending from a side thereof. The positioning tube is enclosed by the receiving tube and has a first engaging portion in an inner periphery thereof. A connection member is connected to the receiving tube and a rod with a spring mounted thereto is inserted in a passage defined in the connection member. The spring is biased between the connection member and a stepped shoulder of the rod. The first end of the rod is movably inserted in the positioning tube and has a second engaging portion which is engaged with the first engaging portion. A second end of the rod extends from a distal end of the connection member. The second end of the rod is retracted in the passage by pulling the knob.
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