| 摘要 |
PURPOSE:To increase the earthing force of a drive wheel and to prevent the occurrence of a slip by a method wherein backup rollers movable in a direction to approach and separate from a guide rail and energized through the force of a spring are disposed on the opposite side to guide rails on which drive wheels are rolled, and rails for backup are installed at the specified section of the guide rail. CONSTITUTION:Drive wheels 2a are rolled on rolling surfaces 18 of guide rails 16 to run a truck. A square rodform rail material 22 is mounted right below the rolling surface 18, and a backup roller 28 is mounted right below the wheel 2a and under the square rodform rail material 22. The backup roller 28 is pivotally supported to a moving arm 30 rockable around a support axle 29 of a bracket 24 run simultaneously with the drive wheel 2a along the rodform rail 22. The backup roller is held in short of a position, where it makes contact with the rail 22, by means of a stopper 36 upwardly energized through the force of a spring 33. When the backup roller is moved over a backup rail 37 mounted in a specified position, e.g. a slope, a slip between the wheel 2a and the rolling surface 18 is prevented from occurring through the energizing force of the spring 33. |
