E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
254/115
E21C 37/02 (2006.01) B25D 9/14 (2006.01) E21C 37/04 (2006.01) B25D 9/00 (2006.01)
Patent
CA 1064464
INVENTOR: DR. GEORGE ANTHONY COOPER INVENTION: METHOD AND APPARATUS FOR BREAKING A HARD COMPACT MATERIAL SUCH AS ROCK OR CONCRETE ABSTRACT OF THE DISCLOSURE A method for breaking a hard compact material such as rock or concrete. The method includes drilling a hole into the material gripping a portion of the wall of the hole by applying a readily outwardly directed force thereto, and applying an axially outwardly directed force to the gripped region in order to cause cracks to arise in the wall of the hole. One of the forces is generated by means of sequentially repeated axially directed impacts. The apparatus for carrying out the method comprises a gripping means and a wedge means slidable relative to the gripping means. The gripping means and the wedge means have cooperating wedge surfaces. A rear extension member having a shoulder is attached to the wedge means. A hammer piston reciprocable in the apparatus housing delivers sequentially repeated axially directed impacts upon the shoulder.
278580
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