A method for sampling rock and other brittle materials and for controlling resultant particle sizes is described. The method involves cutting grooves in the rock surface to provide a grouping of parallel ridges and subsequently machining the ridges to provide a powder specimen. The machining step may comprise milling, drilling, lathe cutting or the like; but a planing step is advantageous. Control of the particle size distribution is effected primarily by changing the height and width of these r...

A rock bolt comprises a bolt rod secured in a borehole, a retaining plate attached outside the borehole, a bolt head for the retaining plate, and a supporting connection between the bolt rod and the retaining plate. The supporting connection comprises a tubular member adapted to be inserted into the bore hole, the tubular member having an outer end and an inner end, the outer tubular member end bearing on the retaining plate, and a compressively loaded, deformable and upsettable sleeve member ac...

A rock drill assembly which includes a drilling machine mounted within a sound-absorbing container. The container is longer than the length of the drilling machine so that the container acts as the guide for the drilling machine as the machine is advanced into the material being drilled. The drill is provided with bearings which engage the inside of the container for guiding the movement of the drill within the container. Apparatus is provided for advancing and retracting the drilling machine re...

A rock-lifting apparatus and method of using the same which incorporates the use of a conventional tractor and a conventional three point hitch mounted thereon. The rock-lifting apparatus includes a pair of spaced parallel elongated removable tines which are mounted on a yoke or frame structure with the same being journaled on two of the arms of the conventional three-point hitch which are adapted to be articulated. The yoke structure is further connected to the third arm of the hitch for positi...

A method of making a rock bolt (1) with a thread on a section thereof comprising the steps of; providing a metal bar of circular or near circular cross-section having a diameter which is substantially equal to the pitch diameter of the thread to be provided thereon; passing the bar in a single pass between a pair of rolls (8, 9) to pinch the bar at intervals to cold form protrusions (2) spaced from one another in staggered formation on opposite sides of the bar along a selected section thereof; ...

A rock anchor consists of a body member formed as a drilling-rod (1), which at one end carries a drill-head (2) and has externally over its whole length a coarse thread, for example an approximately round thread (3). The drill-head (2) is welded to the drilling-rod (1). The drilling-rod (1) has only at its forward region, that is adjacent the drill-head (2) peripheral bores (6), whereby the aforesaid forward region, from the drill-head (2), extend over a length of at most 20 cm. The bores (6) ex...

A rock drill having a drilling head which, in an asymmetric arrangement relative to the main cutting tip, has at least one additional secondary cutting tip, the angle enclosed between the single cutting edge of the main cutting tip and the secondary cutting tip being formed as an acute angle.

A pickup reel has teeth and retainers which move upwardly when an obstruction is engaged. They are positioned by outer and inner cam tracks for optimum operational positioning. The reel is positioned by hydraulic piston and cylinder assemblies which also dump the stone bucket when the lowermost position of the reel is reached and the piston and cylinder assemblies are further extended.

A duck on a rock game is provided and consists of a plurality of playing pieces and a base member whereby one of the playing pieces is positioned on the base member and during play of the game another of the playing pieces can be placed upon the first playing piece. Each playing piece has a flat top surface of given area. A disc, with a flat top of lesser area, is screw threaded to each playing for adjustment between a raised and flush position relative to the flat top of the playing piece to ch...

A method of reinforcing a rock formation with rock bolts establishing a locked-in pre-stress condition inhibiting the initiation of movement of the formation, and structural features of a rock bolt assembly capable of use in the practice of the method.