HYDRAULICALLY OPERATED HAMMER Russian patent published in 1997 - IPC

FIELD: construction, manufacture of building materials, mining; applicable, mainly, for loosening hard rocks and frozen grounds, breakage of oversizes, and other similar jobs. SUBSTANCE: hydraulically operated hammer includes body accommodating block head, pressure and drain lines, distributing device with control valve having bands of various diameters, working chambers and control chamber. In so doing, one of working chambers is constantly connected with pressure line and formed between control valve bands having the largest and medium diameters. Control chamber is formed by bands having the largest and smallest diameters. Band adjacent to control chamber has throttling grooves communicating it with pressure line in block head working stroke. The value of entrance of throttling grooves into working chamber does not exceed the half of the control valve stroke. EFFECT: higher efficiency. 1 dwg