Patent ID: 8371049

Claim:
A hydraulically-operated ripper tool for attachment on a hydraulic arm of carrier or excavator equipment for use in demolition of metal walled structures, comprising: (a) a mounting portion for mounting on an end of a hydraulic arm of carrier or excavator equipment such that the tool can be reciprocated by the hydraulic arm with a hooking motion over a given range of rotation, and (b) a ripper blade having a shank portion fixed to the mounting portion and a blade portion extending from the shank portion having a sharp inner edge extending along a concave curved arc to a sharp point, wherein the sharp inner edge is inclined inward along the curved arc from the shank portion about 10° then forms about 130° of concave curvature where it comes to the sharp point, thereby providing an inclined angle of attack relative to the shank portion which is capable of generating a shearing force on an object of attack when the ripper blade is pulled in a downward direction from the shank portion, and wherein the sharp point at the end of the blade portion provides a point of attack for punching a hole into a metal wall, and the concave, sharp inner edge is capable of providing a shearing force for cutting through the metal wall.