ANORDNING FOR HALDRIVNING I HARDA BERGARTER

摘要

PCT No. PCT/SU85/00064 Sec. 371 Date Mar. 30, 1987 Sec. 102(e) Date Mar. 30, 1987 PCT Filed Jul. 30, 1985 PCT Pub. No. WO87/00885 PCT Pub. Date Feb. 12, 1987.A machine for driving workings in hard rocks comprises a movable carrier (1) having a boom (2) to which is secured a frame (4). An implement (9) having a hammer piston (10) is mounted in the frame (4) by pins (8). The pins (8) have support members (7) cooperating with piston rods (12) of shock-absorbing elements (11) comprising cylinders. Each shock-absorbing elements (11) has a space filled with a compressible fluid in which the end face of the piston rod (12) is received, and a first and second dashpot spaces filled with a non-compressible fluid which communicate with one another through a throttling device. The piston rod (12) has an enlarged piston-like portion which forces the non-compressible fluid to overlfow through the throttling device between the first and second dashpot spaces during movement of the piston rod (12).