Device for guiding a drill tool
This is a continuation of application Ser. No. 423,002, filed 12/10/73. 
    
    
     SUMMARY OF THE INVENTION 
     The present invention relates to a device for applying a drill tool connected to a vehicle mounted drilling machine against a surface. The invention is primarily designed to be used for tunnelling or similar rock drilling work. 
     The invention is mainly characterized by the use of a drill guide mounted on a maneuverable arm carried by a vehicle for supporting and guiding the drill tool at the surface during the so-called operation. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The invention is described below with reference to the 10 accompanying drawings in which 
     FIG. 1 shows a side view of a drill rig for tunnelling. 
     FIG. 2 is a fractional view taken along the line 2--2 in FIG. 1. 
     FIG. 3 is a fractional view taken along the line 3--3 in FIG. 1. 
     FIG. 4 is a view taken along the line 4--4 in FIG. 3 drawn to a larger scale. 
     FIG. 5 shows a second embodiment of the invention. 
     FIG. 6 is a fractional view taken along the line 6--6 in FIG. 5. 
    
    
     DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION 
     The drill rig shown in FIG. 1 comprises a vehicle 10 which can be raised above the ground by means of jacks 15. A frame 14 is mounted on the vehicle. The frame carries a number of hydraulic arms 16, 17, 18. The arms 16, 18 carry drilling aggregates 21, 22 each of which comprises a rock-drilling machine and a feed device associated therewith. The arm 17 carries a platform 25 meant to be used when the drill holes are charged with explosive. The platform is suitably provided with a peg 29 which is pressed against the rock when the present invention is practiced. Two beams 38 (FIGS. 3 and 4) are mounted on the vehicle 10. These beams carry a feed beam 11 via hydraulic cylinders 31, 32 guided by plates 52, 53. A drilling machine 12 with a drill tool 13 connected thereto is displaceably arranged on the feed beam. The drill tool, which is meant for drilling the so-called large-hole is preferably provided with a down-the-hole drill 1. The feed beam 11 can be moved relatively to the vehicle 10 by supplying hydraulic fluid to conduits 36 or 37. A drill guide 26 is mounted at the front end of the feed beam 11 by means of plates 48, 49. The drill guide 26 comprises a joint 56, two jaws 42, 43 which are connected to the joint by means of hinges 63, 64 and a hydraulic cylinder 33 for maneuvering the jaws. The hydraulic cylinder is connected to the jaw 42 by means of a pin 68. The piston rod 59 of the hydraulic cylinder is connected to the jaw 43 by means of a pin 67. 
     A drill guide 27 (FIG. 2) is pivotally connected to an extension 54 on the platform 25 by means of a pivot 46. The drill guide 27 suitably has the same construction as the drill guide 26 and comprises a joint 55, jaws 40, 41, a hydraulic cylinder 30 with a piston rod 58, hinges 61, 62, and pins 71, 72. The jaws 40, 41 are moved into the position shown in FIG. 2 by supply of hydraulic fluid through the conduit 35. 
     In the embodiment according to FIG. 5 the drill guide 27 has been replaced by a drill guide 28. This drill guide is by means of a pivot 47 (FIG. 6) swingably connected to a plate 73. The plate 73 is by means of plates 51 connected to the feed beam 39 of the drilling aggregate 21. The drill guide 28 is suitably built up as the drill guide 26 and comprises a joint 57, jaws 44, 45, a hydraulic cylinder 34 with a piston rod 60, hinges 65, 66, and pins 69, 70. 
     The drill rigs work in the following manner. The drill guide 27 or 28 is brought into engagement with the drill tool 13 by maneuvering the arm 17 or 16 for guiding the drill tool at the rock surface during collaring. When the drill tool 13 has penetrated into the rock face so far that it is guided by the drill hole, the hydraulic cylinder 30 or 34 is unloaded thereby the jaws 40, 41 or 44, 45 are brought apart. The drill guide 27 or 28 is thereafter moved away from the drill tool 13 by maneuvering the arm 17 or 16. This produces the advantage that the drilling aggregates 21, 22 can be used for drilling close up to the so-called large-hole at the same time as the latter is being drilled. 
     The above described and in the drawings shown embodiments of the invention are only to be regarded as examples which can be modified within the scope of the subsequent claims.