| 摘要 |
<p>The device has a U-shaped metal frame i.e. joist frame, provided with two U-shaped mounting legs (1, 2) that form slightly open angle, where one of the legs has two fixation lugs (3, 4) that are provided with double clamping screws (5, 6), respectively. A rotary turntable (7) is attached with the fixation leg by a ball bearing. The fixation leg is provided with a carrying handle (9).</p> |
