Hitachi Construction Machinery Co., Ltd.

Hitachi Power Solutions Co., Ltd.

Hiroyuki Kanazawa

Tomohiko Yasuda

Shinji Akino

Toshio Shikama

Atsushi Nakajima

A pantograph device of a trolley-type truck includes: a base frame; a bottom frame rockably attached to the base frame; a top frame rockably attached to the vicinity of the top end portion of the bottom frame through a connecting shaft; a collector shoe rockably supported in proximity to the top end portion of the top frame; a hydraulic cylinder for raising and lowering the bottom frame, attached to the base frame; and a spring 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.

Pantograph device of trolley truck

A trolley-type truck is provided with a pantograph and travels in a trolley mode under electric power from an overhead wire and a non-trolley mode without obtaining electric power. The pantograph has a base frame, a bottom frame and a top frame rockably attached to the base frame, and a collector shoe supported by the top end portion of the top frame. A fixing member is disposed on the top end side of the top frame for fixing the pantograph, a hook device is disposed on the base frame, and a hook receiver is disposed on the base frame in order to receive the fixing member. When a frame assembly formed of the bottom frame and the top frame is folded, the fixing member becomes seated in the hook receiver and is pressed by means of the hook device, thereby securely fixing the frame assembly to the base frame.

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Hitachi, Japan

Hiroyuki Kanazawa