| 摘要 |
In a machine for troweling large areas of concrete without having a footprint problem, the operator rides on a frame supported by a plurality of troweling rotors, preferably three. Each troweling rotor has three or four troweling blades, the pitch of which is controlled as before except that the pitch control is extended from all rotors to be jointly controlled, or at least separately accessible to the operator in the operator's seat. In addition, the operator can steer the apparatus in all respects by applying a tilting pressure to one or more rotors with selectivity as to the points along the rotor paths at which the increased downward pressure is applied. For ordinary steering, and for forward or reverse movement control, a control stick is provided which swings universally. Forward or rearward swinging of the stick causes forward and rearward movement. Right or left swinging of the stick causes or adds turning to right or left. The machine can also be made to "crab" right or left with right or left movement of the control stick and at the same time by a foot pedal. |
