| 摘要 |
PURPOSE:To generalize the titled truck for various purposes and to simplify its structure by forming grooves on both sides of an annular rail of the steel pipe outside and arranging spheres on the tips of fitting members to roll the spheres along the grooves of the rail. CONSTITUTION:The truck 13 for a welding machine is constituted of a pedestal 14, the fitting members 15 and plural bodies 16 of rotation. The bodies 16 of rotation consist of the spheres and are fitted freely rotatably on the tips of the fitting members 15 via plural bearings 17. One fitting member 15 is inserted into a holder 18 and pressed in the direction of the grooves of the rail 2 via a spring 19. A motor 8 drives the truck 13 by the engaging of a pinion with a rack 10. Since the spheres are used as the bodies 16 of rotation, even if the diameter of a steel pipe is changed, the same truck 13 is used and the truck 13 is generalized for various purposes. Since the mechanism is simple, the structure of the truck 13 is simplified. |
