Patent ID: 6755313
Filing Date: 2004-06-29
Classification: B66C

Abstract:
An overhead traveling crane system comprising:a moving device arranged to be movable in a horizontal direction on an upper track over a target on the ground, a lifting device suspended by wires from the moving device so that it can be raised to and lowered from the moving device vertically by operation of the wires, a target on the ground over which the lifting device is moved to an approximately correct horizontal position by the moving device on the upper track, said lifting device having a lower surface for supporting an object therefrom which is to be lowered to the target in a precise horizontal position thereon, a pair of cylindrical guide members attached to the moving device having flared open ends extending vertically toward an upper surface of the lifting device, and a pair of guide bars attached to the upper surface of the lifting device extending vertically toward the cylindrical guide members on the moving device, wherein when the lifting device is raised vertically to the moving device by operation of the wires, the guide bars on the upper surface of the lifting device are guided and inserted into the cylindrical guide members and held therein to minimize swinging motion of the lifting device after it is moved in a horizontal direction by the moving device over the target, and a pair of position guide members attached to the lower surface of the lifting device having guide ends extending vertically toward the target, and a pair of positioning members attached on side walls of the target having mating ends extending vertically toward the position guide members on the lifting device, wherein when the lifting device is lowered vertically from the moving device by operation of the wires, the position guide members on the lifting device are guided and held by the mating ends of the positioning members on the target in a precise horizontal position on the target, wherein said pair of cylindrical guide members attached to the moving device are positioned relative to said pair of guide bars attached to the upper surface of the lifting device, and wherein said pair of position guide members attached to the lower surface of the lifting device are positioned relative to said pair of positioning members attached on side walls of the target such that said guide bars engage in the flared ends of the cylindrical guide members as said position guide members start to complete their guiding and mating movement with said positioning members in a precise horizontal position on the target, and wherein the tips of said guide bars are positioned inside the flared ends of the cylindrical guide members when said position guide members complete their guiding and mating movement with said positioning members so that they may move with a slight horizontal adjustment movement in the flared ends.