| 摘要 |
The device has a retaining tube (1), and a support wheel (3) whose height is adjustable by a handwheel (2). The support wheel is provided with a wheel rim (5) and tires (4) fastened to the wheel rim, where the support wheel is fastened to a wheel plate that projects opposite the retaining tube. The support wheel is blocked by a brake (8) that stays in effective connection with the wheel rim in a positive or non-positive manner, where the brake is designed as a clamp. The brake has brake shoes that are attached at both sides of the wheel rim. |
