Patent ID: 8424789

Claim:
A demolition tool unit for mounting to a universal body, wherein the tool unit has: a) a pair of movable blades pivotally connected to a main pin forming a jaw structure, wherein the main pivot-pin is fixed to the universal body and does not translate relative to the universal body, b) a pair of linkages, wherein each linkage has a linkage blade end and a linkage cylinder end, wherein each linkage blade end is attached to a separate movable blade and each linkage cylinder end is pivotally attached along a common axis to a common pivot pin to define a general jaw structure, c) a common hydraulic cylinder attached to each linkage at the common pivot pin for moving the blades over a range, wherein a cylinder has a center line that is aligned with the common main pin and the common pivot pin throughout the range of travel of the cylinder, d) a general jaw geometry which defines main geometric parameters of the general jaw structure of the demolition tool unit, wherein the distance between the common main pin and the linkage blade end defining a lever arm length is greater than the distance between the linkage blade end and the common pivot pin defining a linkage length, and wherein the lengths of the pair of lever arms are equal and the pair of linkage lengths are equal, and e) wherein, when the hydraulic cylinder is activated, the equal length linkages and the equal length lever arms move together to rotate each movable blade the same amount and to apply to each movable blade the same moment.