| 摘要 |
<p>A unit (1) comprising a support wheel (20) at its lower end can be extended vertically or retracted as required. The mechanism is controlled manually with a lever (22) facilitating hydraulic fluid moving from a cylinder (10) into a storage tank (3) resulting in the support wheel (20), additionally pulled by a spring (14), to be moved upwards. When the wheel (20) is moved down with the foot of the driver pushing against the forces of the spring (14) a non return valve (8) is opened and hydraulic fluid guided into the cylinder (10).</p> |
