PERCUSSIVE-ACTION MACHINE FOR DRIVING BORE-HOLES IN GROUND Russian patent published in 1999 - IPC

FIELD: construction machinery and equipment. SUBSTANCE: machine is used for trenchless laying of underground service lines, for driving bore-holes in ground of preset trajectory. Percussive-action machine has following components: body with striker located inside it, head-piece with head member in the form of single-side wedge, bush with spiral-shaped blades on external surface which is installed on body for possible rotation, device for coupling and uncoupling of bush and body. Bush is made integral with head-piece. Bush is installed on head part of body and is made in the form of its stage of smaller diameter. External diameter of bush with head-piece is not larger than external diameter of body. Internal surface of recesses of spiral-shaped blades is configurated as taper with taper apex directed towards head part of head-piece. Surface of head-piece in normal cross-section is of spoon-like configuration. Head part of head-piece is provided with internal space which is open in front. Head-piece has passages for communicating its internal space with external surface. Aforesaid embodiment of percussive-action machine is prominent for simple design and high operational reliability. EFFECT: higher efficiency., 5 cl, 5 dwg