| 摘要 |
PURPOSE:To obtain a caster capable of changing the direction smoothly by providing moving bodies to be movable in guide frames facing each other and supporting wheels to be rotatable between these moving bodies via bearings. CONSTITUTION:In a revolving frame 1, plate-shaped support legs 3 are provided to face each other in one body at an assigned interval under a disk 2, while connecting rods 4 are laterally arranged in one body in the middle of the support legs 3 on both sides. Guide frames 5 fixed at the lower ends of the support legs 3 are provided with ball bearings 11 rotatably as moving bodies. Both ends of axles 12 are connected to these bearings 11, while wheels 13 are mounted on the axles 12. Outside laces 16 of bearings 11 are slidable fitted into guide parts 10 of movable frames 5, and rotated as sliding by the movement of guide frames 5. |
