BOOM LIKE ACTUATING MEMBER OF HEADING MACHINE Russian patent published in 1995 - IPC

FIELD: mining equipment. SUBSTANCE: face breaking tools, mounted on an end surface of a crown, are in the form of hydraulic percussion mechanisms. Each mechanism has a valve with a floating spring-loaded seat. The hydraulic percussion mechanisms are arranged by an optimal angle relative to a surface of the face, for example by an angle, equal to (54-61) degrees. Such arrangement provides enhanced efficiency of cutting a drift due to possibility of breaking rocks, having mean strength value and strength value more, than mean one. EFFECT: enhanced efficiency. 2 cl, 3 dwg