DE7923274U1 - EARTH DRILL WITH DRILL HEAD - Google Patents

Description

The present invention relates to an auger that has a drill pipe and a releasably coupled thereto, the end of the pipe is provided with a screw-shaped drill head.

Augers of the aforementioned type are used when pouring concrete piles in the ground. The earth auger will be at This application is drilled into the ground and the drill pipe is filled with concrete with or without reinforcement. After the concrete has hardened, the drill pipe can be removed if necessary.

In known auger bits of this type, the head is solid and the drill pipe end adjoining it encloses the upper one Head end. The drill pipe is provided with a toothing for the purpose of its coupling at the head, which with a corresponding Toothing of a collar protruding from the head cooperates, so that when the tube is rotated, the Head is taken. However, this known system has the disadvantage that it is located on the outside of the head Toothed collar is very difficult to make with sufficient strength, therefore with strong The drill pipe is always stressed by high torques the risk of breaking off the collar or the toothing is to be feared.

The problem addressed by the present invention is expediently the aforementioned disadvantage of the known system to fix. The invention therefore relates to an auger with particularly high torques on the drill pipe can attack without risk of damage to the head.

For this purpose, the screw-shaped drill head is hollow and the end of the drill pipe is inserted into the hollow head.

According to a special embodiment of the invention, the wall of one of the two elements formed by the hollow drill pipe and the hollow drill head is provided with at least one recess, while the wall of the other element has at least one projection that fits in this recess
having.

The aforementioned hollow head is expediently provided with a Provided internal teeth, while the end of the drill pipe stuck in the same with teeth that fit between the head teeth is provided.

According to a particularly expedient embodiment of the invention is between the inside of the head and the
A suitable sealing material is arranged on the outside of the drill pipe end stuck in the head. In this case

is the outer edge of the open head end on its inside beveled.

In this embodiment, a on the bevel

j arranged plastic sealing material when entering

pushing the drill pipe into the head automatically entrained between the drill pipe end and the inside of the head, which means that it extends over a relatively long area
of the pipe end gives an excellent seal.

According to a particularly expedient embodiment of the invention, the apex angle of the head is 53-57 °,
preferably 55 °. The invention also relates to

one to equip any of the above mentioned designs own drill head.

Further characteristics and advantages of the system according to the invention emerge from the following detailed description of a earth auger equipped with a suitable boring head one embodiment of the invention revealed. These are only examples Description given without any restrictive intention takes place on the basis of the accompanying drawings, Where

Figure 1 shows a part of an inventive earth drill reproduces in longitudinal section;

Figure 2 shows a longitudinal section similar to Figure 1 reproduces, with the drill pipe but in a position during äes tiihtixnschiebens in the head in front of its coupling to the head is located; and

Figure 3 shows part of the head of the auger according to the previous figures in plan view ,. In these three figures, the reference numbers refer to the same elements each time.

The auger according to the enclosed figures consists of the essentially consists of a drill pipe 1 and a single hollow drill head 2. This drill head 2 is a metallic hollow cone body with a helical outside and also helical inside, so that it corresponds to the height of the turns has the same wall thickness everywhere, except at the top of the open cone base, where the wall thickness is greater.

The wall part reinforced in this way is provided with teeth 3, where | the gaps between the teeth with the interior space and the base {opening of the hollow truncated body in communication. |

The upper turn 4, i.e. on the cone base, is located just opposite the aforementioned teeth 3 and forms an outwardly protruding, perpendicular to the head axis Rib.

At the open end of the drill head 2 is above the aforementioned upper turn and the teeth 3 a collar 5 protruding, the concurrent is with the drill head axis and is almost in alignment with respect to the outside 6 of the penultimate next to the turn 4 Winding is arranged.

The upper edge of the collar 5 has an inner bevel 7. The inner wall of the hollow cone body formed in this way is optionally provided with one or more stiffening ribs omitted from the figures for the sake of clarity.

The vertex angle α of the drill head 2 thus designed, i.e. is the apex angle of the theoretical outer cone that touches the turns with the exception of the upper turn 4 53-57 °, preferably 55 °. It has been shown in practice that such an angle ensures an optimal drilling effect. The relationship between the side effect and the area of friction the auger is optimal.

The drill pipe 1 is a metallic hollow cylinder, the outside diameter of which is only slightly smaller than the inner diameter of the aforementioned collar 5 of the drill head 2, the one The end of this drill pipe is provided with teeth 8 that fit between the teeth 3 of the drill head 2.

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> a
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The mounting of the auger takes place by pushing in the end provided with teeth of the drill pipe 1 in the open _t within the collar 5 located end of the drill head 2 instead, where, as between the chamfer 7 can be seen particularly from Figure 2, the collar 5 and a string 9 of a suitable sealing putty is arranged at the lower end of the drill pipe 1, which is automatically carried along between this end and the inner wall of the collar 5 during the further pushing of the drill pipe 1 into the drill head 2. This results in an excellent seal between the drill pipe 1 and the drill head 2 Are engaged, can be arranged on the bevel 7, from which the aforementioned strand 9 has now completely removed, a new strand 10 of the same sealing putty. When the auger is used, this second string of sealing putty is pressed into the slot between the bevel 7 and the drill pipe 1 by the water pressure acting in the borehole on the outside of the auger, which further improves the seal between the drill pipe 1 and the drill head 2.

When the auger is completely drilled into the ground, the drill pipe 1 is filled with concrete. After the hard of the Concrete, the drill pipe can be pulled out of the borehole if necessary.

Thanks to the fact that the drill pipe 1 in the drill head interior reaches into it, there is a very strong coupling between the pipe 1 and the head 2, consequently the drill pipe during the Drilling in the ground with a very large torque without endangering the pipe 1 or the head 2 can be claimed.

The packing 9 located on the inside of the drill head 2 ensures a good seal already during the introduction of the drill head, even if this is a little ahead with respect to the drill pipe 1 and this is thereby somewhat loosened with respect to the drill head.

There is also the possibility of being next to the teeth 8 in the toothed end of the drill pipe 1 to provide a slot, which is after the drill pipe 1 has been pushed into the drill head 2 is located approximately opposite the bevel 7, the Pack 10 also partially push itself into this slot leaves.

The present invention is in no way limited to the implementation methods described in the preceding lines, but rather sxch suitable for the most diverse changes and adaptations of the same, among other things with regard to the shape, composition, Arrangement and number of for the implementation of the invention System required parts.

Claims (11)

Patentanwälte Manitz, RnsferwalärSrGräiiiKetf 8 Munich 22, Robert-Koch-Strasse 1 Munich, August 14th, 1979 "PUNDEX" P.V.B.A. Auger and drill head used for it Claims: 1. Earth auger with a drill pipe (I) and a detachable one on the same coupled screw-shaped drill head (2) closing the pipe end, characterized in that that the screw-shaped drill head (2) is a hollow body and the drill pipe (1) with its end in this hollow drill head (2) is stuck. 2. Earth drill according to claim 1, characterized in that that the wall of one of the elements formed by the hollow drill pipe (1) and the hollow drill head (2) has at least one recess has, while the wall of the other element with at least one, fitting in this recess projection is provided. 3. auger according to the preceding claim 2, characterized in that that the hollow head (2) is provided with an internal toothing (3), while the one stuck in the same The end of the drill pipe (I) is provided with corresponding teeth (8) which fit between the teeth (3) of the head. 4. Auger according to any one of the preceding claims 1-3, characterized in that between the inside of the drill head (2) and the outside of the head stuck End of the drill pipe (1) a suitable packing material (9) is arranged. 5. Earth drill according to the preceding claim 4, characterized in that that the inside of the upper edge of the open end of the drill head (2) has a bevel (7). 6. Earth drill according to any one of the preceding claims 1-5, characterized in that the drill head (2) has a collar (5) on its open side, in which <?, as the end of the drill pipe (1) stuck in the drill head (2) fits. 7. Earth drill according to the preceding claim 6, characterized in that that the outer diameter of the collar (5) is slightly smaller than the outer diameter of the outermost one, on the open side of the head (2) located winding (4) of the helical hollow body forming this head. 8. Earth drill according to the preceding claim 7, characterized in that that the aforementioned collar (5) is aligned with respect to the outside (6) of the penultimate turn while the outermost turn (4) one over this outer side (6) and the collar (5) forms a protruding rib. 9. Earth drill according to claim 5 urri: \ rgendeine · of the claims 6-8, characterized in that the aforementioned bevel (7) of the upper edge of the open end of the drill head (2) is a bevel of the upper edge of the aforementioned collar (5). 10. Earth drill according to any one of the preceding claims 1-9, characterized in that the apex angle of the Drill head (2) is 53-57 °. Sdiufzanspr. / 1 It. Βϊ. / Ί ^ deleted it'10.79 11. Earth drill according to the preceding claim 10, characterized in that ί indicates that the apex angle of the drill head (2) is 55 °. —E- of-fen » ,