초록 ▼

An automatic levelling device for a fluid nozzle pivotally mounted on the outer end of an aerial boom such that, irrespective of the vertical position of the boom, the nozzle will remain in a horizontal plane. Either manually operated control of the fluid nozzle vertical position or automatic contro

An automatic levelling device for a fluid nozzle pivotally mounted on the outer end of an aerial boom such that, irrespective of the vertical position of the boom, the nozzle will remain in a horizontal plane. Either manually operated control of the fluid nozzle vertical position or automatic control that maintains the fluid nozzle in a horizontal plane can be selected by a switch.

대표청구항 ▼

[ I claim:] [2.] Apparatus for automatically controlling a fluid nozzle on the outer end of a movable aerial boom on a vehicle to maintain the fluid nozzle in a horizontal plane, the apparatus including:a first drive mechanism for moving the aerial boom in a vertical plane;a second drive mechanism f

[ I claim:] [2.] Apparatus for automatically controlling a fluid nozzle on the outer end of a movable aerial boom on a vehicle to maintain the fluid nozzle in a horizontal plane, the apparatus including:a first drive mechanism for moving the aerial boom in a vertical plane;a second drive mechanism for moving the fluid nozzle in a vertical plane;a first operator-controlled device coupled to said first drive mechanism for selectively moving the aerial boom in a vertical plane;a second operator-controlled device coupled to the second drive mechanism for selectively moving the fluid nozzle in a vertical plane;a horizontal level detector associated with movement of the fluid nozzle in the vertical plane and generating an output signal when the fluid nozzle is not positioned in the horizontal plane; anda switch for selectively disconnecting the second operator-controlled device from the second drive mechanism and simultaneously connecting the horizontal level detector output signal to the second drive mechanism to automatically keep the fluid nozzle in a horizontal plane as the aerial boom is moved in the vertical plane.