| 摘要 |
PURPOSE:To dispose a door drive section in a proper position by slidably back and forth opening and closing a door slidable along the side of a body through a motor driven endless wire provided in a hollow section of the body. CONSTITUTION:While an outside surface of a body 20 located behind an entrance 5 is provided with an groove-like upper guide rail 8, a lower guide rail 6a is disposed on a step. Then, a door 2 is provided with rollers 22, 25 to be slidably supported on the rails 8, 6a. Next, a miniature motor 30 and pulleys 31, 32 are mounted in a cavity of the body 20 inside the rail 8. A wire 40 wound to the motor 30 at least a round thereof is stretched through the pulleys 31, 32 and auxiliary pulleys 35, 36 to secure the end fixedly to a proper position of the door 2. The motor 30 is rotated in normal and reversal by a switch in a cab to open and close the door 2. Thus, an opening and closing drive section is provided neither on the upper surface nor on the lower surface of a step section, so that one can sefely smoothly get in and off and the opening and closing drive section can be prevented from breakdown caused by the contact with the ground. |
