GB190007107A - An Improved Deep Boring Earth or Rock Drill. - Google Patents

Abstract

7107. Dannhardt, F. H., and Mailer, M. April 17. Deep-boring.-The boring and reamering cutters and the core-collecting arrangements are mounted in a carrier, which can be disconnected from the rods and drawn to the surface independently of them. In Figs. 1 and 2, the carrier a is locked to the rods c by bolts h, operated by inclines on the plate i, of which the lower end is wedge-shaped, to throw out the pivoted holders b having the removable reamering-cutters v. The plate i is connected by the tube j, to the weight k, and a rope m passes from the weight to a winch in the rig for hauling up the carrier. The tube and passages through the collars &c. in the carrier allow water to pass down the rods to the tools. The core barrel forms an extension of the carrier a, as shown in Fig. 2, which is a continuation of Fig. 1, and contains a false core z, which is held by a clip or catch l connected by rods 3 to the haulage rope m. A eccentric ring w, fitted in a eccentric recess in the barrel, is thrown by a spring x, Fig. 6, when released by a pin y on the false barrel to grip and break off the core. The cutting-tools e lie alternately inside and outside a ring 6, where they are held by screw-threaded rings 7, 8, the surfaces of the tools where they bear on these rings being correspondingly threaded, and the cutting-points may be set like a saw. Fig. 15 shows the driving-gear &c. The rods c are held in a guiding and driving sleeve 24 by a clutch 26 with three jaws operated by eccentric inclines inside a ring when turned in one direction so as to grip and to release in the other direction. The sleeve 24 is feathered in a worm-wheel 13 driven by a worm 15 and gearing. A brake for holding up the rods c consists of a split conical ring at 31, which can be moved by a foot-lever &c. 35. A winding-drum 37 surrounds the driving-sleeve 24, and is driven by gearing 38 from the worm shaft 15 through a clutch. The rope m from this drum is led round guide-pulleys &c. down the tube to the tool-carrier. The sleeve 24, after being fed down, can be raised by the tackle 62, of which the lower pulley is connected to a ring mounted in bearings on the sleeve. Modifications of the carrier and tools are also described. In Fig. 23, pivoted locking-bolts h and a hollow pivoted reamering- cutter 77 are operated by a series of slotted sleeves connected to the weight and rope m. The reamer has an inclined cutter 82, which collects the cuttings into the holder, and the bottom tool is of hollow conical form with an inclined cutter which acts like an auger, Fig. 33. Or the bottom tool may be a solid screw-threaded cone 110, as in Fig. 32, to force its way through soft ground, and, instead of reamering-cutters, a number of eccentrically-mounted rings 121 with antifriction bearings are projected in stepped form by a threaded spindle 118 operated by the weighted sleeves which work the bolts.