| 摘要 |
<p>1,101,692. Rotary rock drills. JOY MANUFACTURING CO. 25 Oct., 1965 [13 Jan., 1965], No. 45011/65. Heading B3C. [Also in Division B4] A tripod mounting for a rotary-percussive rock drill comprises a drilling tool 54 carried by a guide frame 10 which is movable along a trunnion member universally pivoted on a mobile frame 14, a pair of extensible leg members 49 being connected between the trunnion member and the frame. The trunnion member is in the form of a square tube 36 provided with mounting plates (39, Fig. 4) for supporting the guide frame and having a universal joint (30, 43, Fig. 4) permitting lateral and forward-andbackward movement relative to the frame 14, via the extensible members 49; the frame is mounted on a crawler 18. The drilling tool 54 is moved along the guide frame via a motor 63</p> |
