Rotary striker tool for rock drilling, - has hard metal points inclined in rotary direction and pivoted further inwards towards drilling tool axis

摘要

The tool has individual destructive elements (7, 8) arranged on its front side which are inclined in the direction of rotation. Their angle of inclination in the direction of rotation is between 20 and 45 deg. to the parallel to the axis of the tool, but where limestone is being drilled the angle is between 32 and 35 deg., for basalt between 20 and 25 deg., and for granite between 5 and 10 deg. The destructive elements are pivoted also inwardly to the drill tool axis, the pivoting angle with increasing distance of the elements from the tool axis reducing from 20-40 deg. to 4-7 deg. Elements arranged on a vaulted front surface (4, 5) of the tool are also outwardly directed. The elements are pointed with a wedge angle so that the parallel to the axis of the drilling tool is located through their points. USE/ADVANTAGE - To increase the degree of effect of a rotary striker rock drilling tool.