| 摘要 |
<p>An operating device for an electric hoist having a DC motor for winding-up and -off an object, comprises a low speed adjusting setting unit (VR l) and a high speed adjusting setting unit (VR 2) provided in a control box (3) of the hoist. The operating device further comprises in the control box a two-step push-button switch (PB-U) for winding-up operation for switching over the low speed adjusting setting unit and the high speed adjusting setting unit to connect either of the units (VR l and VR 2) to a speed-change control circuit by pushing the two-step push-button switch (PB-U) to either of first and second step positions, and a two-step push-button switch (PB-D) for winding-off operation for switching over the low speed adjusting setting unit (VR l) and the high speed adjusting setting unit (VR 2) to connect either of the units to the speed-change control circuit by pushing the two-step push-button switch (PB-D) for winding-off operation to either of first and second step positions.</p> |
