Patent GB-190401689-A (GB)
Title: Improvements in and connected with Deep Boring Apparatus.
Inventor: RAKY ANTON
Filed: 1904-01-22
Granted: 1904-12-08
Abstract: 1689. Raky, A. Jan. 22. - Deep-boring.-Boring-rods are carried by a pair of discs the touching faces of which are provided with a sloping and a vertical face. On rotating the lower disc in one direction, the upper disc and the boring-rods are gradually raised and suddenly dropped, thus providing means for percussive boring, and on rotation of the lower disc in the opposite direction, the boring-rods, in this case attached to the upper disc, are caused to rotate, thus providing means for rotary boring. In Fig. 1, two discs or cylinders a, b are provided on their touching faces with teeth, each having a sloping face d<1> and a vertical face d', the disc b being surmounted by a cap g and a thumb-screw g<1> which is screwed to the upper part of boring-rods c. The lower disc a is prolonged at a' so as to be capable of rotating in a ground plate e and is carried by ball bearings e<1> and driven by a bevel-wheel f which meshes with a bevel-wheel f<1> carried by a shaft f<3> driven by a pulley f<2>. Spiral springs h situated round pins h<1> fitted to a disc h' serve to press the discs h<2>, b upwards, balls h<3> being interposed between the two, the springs h<2> being of such strength that, in the normal position, the boring-rods are lifted so that the bevel faces d<1> on the discs nearly touch one another. As arranged for percussive boring, two pins b<1> enter and may slide in guides b<2> fixed to the ground plate e and serve to prevent the rotation of the upper disc b. Dnring the working, the cap g serves as an air buffer by retarding the outflow of the air contained in the space between the discs a, b. When arranged for rotary boring, e.g., as a diamond drill, the disc a is rotated in the opposite direction, the pins b<1> on the guides b<2> are removed, so that the discs may act as an ordinary coupling, and the boring-rod c is rigidly connected to the upper disc b in any suitable manner. In a modification, the upper disc b is provided with projecting rods the outer ends of which may slide in guides forming part of the ground plate, a large number of springs being fixed between the projecting rods and the ground plate. In Fig. 3, several pairs of discs a, b are arranged over a ground plate e, and carry a second plate n from which boring-rods c are suspended, springs being arranged between the plates e, n, or the discs may act on the middle of a lever pivoted at one end and having the boring-rods pivoted at its other end, thus increasing the stroke of the boring-rods. In these cases, when it is required to bore by rotation, the rotation of the boring-tools may be effected by moving the whole apparatus until one of the pairs of discs is overthe hole to be bored, and connecting the boring-rod to one of the discs. When applied to boring by ropes as in Fig. 5, a pulley o' is carried by one of a pair of discs a, b and a rope o passing over the pulley is wound at one end on a rope drum, the boring-rods being attached to the other end, or the loose disc may be situated underneath the fast disc and carry below it a pulley, a rope being passed round the pulley and over two rollers mounted on the ground plate, guides being fitted in each case to prevent rotation.