Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1991-06-06
1992-12-08
Novosad, Stephen J.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
286302, E21B 1707
Patent
active
051689448
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a telescopically extensible drill.
Extensible drills are used, for instance, for rock drilling purposes, e.g. for drifting tunnels. The drills are used to drill holes intended for receiving explosive charges for instance. When applying known techniques, the drilling machine or drilling equipment used is constructed for advancement along a so-called drill guide-bar or feed bar. Such rock drills will preferably operate in the manner of hammer drills, i.e. drills which subject the drill to axially-directed impacts while the drill rotates. With known techniques, the length of the drill is extended during a drilling operation, by joining the drill to one or more drill rods, so that the requisite depth of the drill hole can be achieved. This is effected, for instance, by placing a rack of drill rods adjacent the drill guide-bar. The work of splicing or otherwise joining the drill-rod(s) to the drill is normally automated or effected with the aid of mechanical devices. Unfortunately, this requires the provision of relatively complicated peripheral equipment. The drill-rod magazine with associated equipment is also bulky and space consuming.
OBJECTS AND SUMMARY OF INVENTION
The object of the present invention is to provide a telescopically extensible drill which will eliminate the need for splicing or joining drill-rods to the drill which has a drill member in which a drill rod is longitudinally displaceable between two different drilling positions to effect an extension of the drill. This object is achieved by a drill. The extensibility of the inventive telescopic drill eliminates all need of said rod-splicing equipment.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to exemplifying embodiments thereof illustrated in the accompanying drawings, in which
FIG. 1 is a partly cut-away longitudinal view illustrating the inventive drill in a dismantled state;
FIG. 2 is a sectional view through the drill barrel, taken on the line II--II in FIG. 1,
FIG. 3 is a sectional view taken through the drill barrel on the line III--III in FIG. 1;
FIG. 4 is a sectional view of a drill rod taken on the line IV--IV in FIG. 1;
FIG. 5 is a schematic view of the inventive drill in its assembled, operational state; and
FIG. 6 is a schematic view which illustrates the drill in a telescopically extended state, i.e. its extended functional state.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
As illustrated in FIG. 1, the inventive, telescopic, extensible drill comprises an outer drill barrel 1, an inner drill rod 2 and a drill bit 3.
The forward end of the drill barrel 1 has an external screw thread 10. The drill barrel 1 also has a first axially extending centre bore 11 and a second axially extending centre bore 12, said bores being of circular cross-section and the bore 12 having a larger diameter than the bore 11. The bore 11 has provided therein a circular groove 13 which is intended to receive a seal 40. The bore 11 is also configured with two recesses 14 and 15, as illustrated in FIGS. 1 and 2. The recess 14 has longitudinally spaced end surfaces 14a and 14b respectively, and respective edge parts 14c and 14d. The recess 15 has longitudinally spaced end surfaces 15a and 15b respectively, and edge parts 15c and 15d. Disposed within a part of the bore 11 are two longitudinally extending recesses in the form of grooves 16 and 17 respectively, which extend between the recesses 14, 15 and the central bore 12. The configuration of the grooves 16 and 17 is shown in FIGS. 1 and 3.
The rear end of the drill rod 2 has a screw thread 20 by means of which the drill rod can be fitted to the drilling machine, whereas the forward end of the drill rod has a screw thread 21 for fitting the drill to the drill bit 3. The drill rod 2 has a cylindrical part 22 of circular cross-section, on which there are provided two radial projections or shoulders 23 and 24, as illustrated in FIGS. 1 and 4. The diametrical extensio
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patent: 3194330 (1965-07-01), Ware et al.
patent: 3255612 (1966-06-01), Mayer et al.
patent: 4004643 (1977-01-01), Newman
patent: 4113038 (1978-09-01), Clark
patent: 4133395 (1979-01-01), Schmidt
Gruvprodukter I Gallivare AB
Novosad Stephen J.
LandOfFree
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