Patent ID: 8978222
Filing Date: 2015-03-17
Classification: B25B,Y10T

Abstract:
1. A tool for removal of annular elements or rings, tightly mounted in holes, or in blind holes, in parts, of type exerting axial traction on the annular element, the tool comprising: a tie-rod adapted to be engaged coaxially in the axial passage of the annular element and terminating at its distal end passing through the axial passage of the annular element in an enlarged head having a diameter less than the inside diameter of the axial passage of the element and which is fed into the hole beyond a distal transverse face of the annular element; means for contact with the annular element, taking a form of an annular cage with lateral claws that are elastically deformable in the radial direction, which cage surrounds the tie-rod and passes through the axial passage of the annular element such that the claws come to be pressed against the distal transverse face of the annular element; and drive means for acting on the tie-rod to extract the annular element from the hole through action of the claws of the contact means driven by the enlarged head of the tie-rod, wherein the lateral claws of the annular cage are in a position deformed radially inwards when they pass through the axial passage of the annular element and, on exiting the passage, spontaneously resume their initial position with an outside diameter of the claws greater than the diameter of the axial passage of the annular element and less than the diameter of the hole, and an inside diameter less than the diameter of the enlarged head, to be pressed against the distal transverse face of the annular element, so that the tie-rod, because of action of the drive means, comes into contact with the claws of the cage by its enlarged head and drives the annular element out of the hole, and wherein, in the enlarged head of the tie-rod, there is provided an external annular shoulder having a diameter at most equal to the inside diameter of the lateral claws when they occupy their initial position to receive them.