| 摘要 |
PURPOSE:To lead a hose to smoothly follow by supplying an oil pressure through an oil-pressure hose supported on the link piece of a pantagraph to the spiral oil-pressure device of a cleaning head turnably provided to the lower end of an elevating pantagraph. CONSTITUTION:An expandible multiple pantagraph 3 is hung down in a gravitationally lowering manner from a frame 1 set on the ground's surface for a manhole. The lower end of the expandible arm consisting of the multiple pantagraph 3 is connected in a freely raising manner by the cable 12 of a hoister M provided to the frame 1. A cleaning head A is turnably attached to the lower end of the expandible arm 3 by an oil-pressure turning driver B. Oil pressure is supplied through an oil-pressure hose 15 supported in such a way as to bend it integrally with the link pieces 3a and 3b of the expandible arm 3 from the land. The inner walls of the manhole can be automatically cleaned throughout all the deep portions. |
