| 摘要 |
A pantograph device of a trolley-type truck includes: a base frame 6; a bottom frame 8 rockably attached to the base frame; a top frame 10 rockably attached to the vicinity of the top end portion of the bottom frame through a connecting shaft 9; a collector shoe 5 rockably supported in proximity to the top end portion of the top frame; a hydraulic cylinder 14 for raising and lowering the bottom frame, attached to the base frame; and a spring 15 one end side of which is connected to the base frame side, the other end side of which is connected to the base end portion side of the top frame, and which acts so as to rotate the top frame upward through the connecting shaft. By erecting the bottom frame by the hydraulic cylinder, the tensile force produced in the spring is increased and the top frame is rotated upward through the connecting shaft. This makes it possible to obtain a wide movable range without use of a long and strong spring and enhance the followability to overhead wires without increasing pressing force. |
