| 摘要 |
The object of the invention is a hydraulic percussion device suitable for demolition works, digging works and rock breaking works and any other job which needs a powerful hammering or percussion action on proper working tools. This device is made up by a cylinder (7) having two diameters equipped with holes and connecting canals in which a piston (3) having two diameters and a distribution valve (4) having three diameters run freely with rectilinear alternate movement which provides the cyclic succession of the piston's (3) percussions on the working tool (6). |
