Patent ID: 9726217
Date: 2017-08-08
CPC Classifications: B23D,B26F,F16C

Claim:
1. A mandrel, comprising: a pair of jaw elements slidably mounted relative to one another and separated from each other; wherein each one of the pair of jaw elements has a pair of opposing side portions and a center portion disposed between the opposing side portions; wherein each one of the side portions has a convex outer surface with a radius of curvature equal to a radius of the inner diameter surface of the bore and is configured to contact an inner diameter surface of a bore of a connecting rod when the pair of jaw elements are moved away from one another within the bore so as to break the connecting rod; wherein each center portion is configured to be spaced apart from the inner diameter surface of the bore when the pair of jaw elements are moved away from one another within the bore, such that the opposing side portions contact the connecting rod bore; and wherein each center portion has a convex outer surface that has a radius of curvature greater than the radius of curvature of each one of the side portions to progressively increase contact with the inner diameter surface of the bore as the pair of jaw elements are moved away from one another.