| 摘要 |
A cutting pick includes an elongated shank, a cutting tip fixed to one end of the shank which is of a material that is harder than the material of the shank. A multitude of cavities in the form of spiral slots and internal cavities make up part of the shank and contain high thermally conductive material, which has a lower propensity for incendive frictional contact between the shank and rock being excavated. Both the spiral slots and a mechanical spring-loaded rotational device forcibly rotate the pick axially and in predominately the same direction (either clockwise or anti-clockwise) and in a semi-uniform manor as cutting advances. Rotating the pick in this fashion will restrict the propagation of an incendive wear flat on the trailing edge of the shank after the tip has eventually worn away and presents a fresh portion of high thermally conductive material into the frictional hot streak. Figure 1 Figure 2 |
