| 摘要 |
A support apparatus includes a first tube, a second tube pivotally connected with the first tube, a rod telescopically connected with the first tube and a positioning device for retaining the rod in position relative to the first tube. The positioning device includes a mount secured to the first tube and a latch movably mounted on the mount between an engaging position where the latch engages with the rod and a releasing position where the latch releases the rod. The mount includes two lateral portions secured to the first tube. The latch is pivotally mounted on the lateral portions of the mount. Each of the lateral portions of the mount defines an aperture. The latch defines an aperture. A bolt is inserted through the aperture defined in each of the lateral portions of the mount and the aperture defined in the latch. The mount includes an intermediate portion formed between the lateral portions. A spring is arranged between the intermediate portion of the mount and the latch for retaining the latch in the engaging position. The latch includes a first section for engagement with the rod and a second section to be operated so as to move the latch between the engaging and releasing positions. The rod includes a series of teeth. The first section of the latch includes at least one tooth formed thereon for engagement with at least one of the teeth formed on the rod in the engaging position.
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