| 摘要 |
PURPOSE:To lower the height of a multi-stage type rack duster (or dust remover) with respect to the full lifting height of a rake by providing plural elevating guide frames to a tilting frame in an expansible multi-stage and also providing a rake arm through an elevating block to the lowest stage guide frame. CONSTITUTION:When the chain wheel 21a of a tilting frame 4 is turned to the right or left side by a driver 5, a tension force is produced on the rising or lowering side of the chain 22, and a guide block 13' is vertically moved with the upper stage guide frame 3a along the frame 4. When the frame 3a is vertically moved, a chain 18 is turned to the right or left side to vertically move the guide block 13 of the lower stage guide frame 3b. The frame 3b is then vertically moved to give a tension force to the chain 19, and the vertically movable block 2 is raised or lowered along the frame 3b. A vertically movable gear 8 is turned to the right or left side in relation to the frame 3b, and the rake arm 1 is vertically moved for a distance as much as two times the vertically moving distance of the block 2. |
