| 摘要 |
A roller skate in which the automatic action of normal walking produces a driving action on the wheels. A heel kick to the pedal of the skate causes the putting in operative position of a control device. During the lifting of the skate, the control device comes back to a standby position. A toe kick to the pedal after the waiting position causes the putting in braking position of the control device. The braking is controlled by the depression of the pedal and is progressive. The control device is locked in the position selected and a new position requires the reversion to the standby position. |
