To improve the efficiency when a bulk material is unloaded by a grab bucket.
A distance between a first sheave 20 and a second sheave 23 is set so that a distance between a first hoisting rope 19 and a second hoisting rope 21, which are hanged respectively around the first sheave 20 and the second sheave 23 of a trolley 7 and the tips of which are fixed to the grab bucket 53, becomes shorter gradually as it goes downward. When the traverse motion of the trolley 7 is started, the hoisting rope existing on the back side of the traverse direction is wound up, so that the grab bucket 53 is suspended to be inclined to the back side of the trolley 7 and when the traverse motion of the trolley is stopped, the winding-up operation of the hoisting rope existing on the front side of the traverse direction is stopped and the hoisting rope existing on the back side of the traverse direction is let out and the grab bucket 53 is shaken out forward in the traveled direction of the trolley 7 and the grab bucket is landed in a tank 8', so that the bulk material 80 existing not at a position just under a manhole 9 of the tank but in the area before and behind the position, in the area outside the position or in the depths of the tank can be unloaded.
SAITO OSAMU
TAGUCHI TAKAAKI
| JP2001048474A | 2001-02-20 | |||
| JP2003040577A | 2003-02-13 | |||
| JPS56128376U | 1981-09-30 | |||
| JPS439891Y1 | 1968-04-30 | |||
| JPS376840Y1 | ||||
| JPS4722540Y1 | 1972-07-21 | |||
| JP2006076785A | 2006-03-23 | |||
| JPS354223Y1 |