DE1239643B - Extension percussion drill - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

E21c

German class: 5b- 23/00

Number: 1239 643

File number: B 64009 VI a / 5 b

Filing date: September 14, 1961

Open date: May 3, 1967

The invention relates to a percussion drill for expanding boreholes. It is already an expansion roller bit known, the rollers of which on the star-shaped extending pin of the Base body are stored, which © are inclined towards the pilot hole and carry cutting rollers, those with a plurality of axially spaced apart cutting ribs of wedge-shaped Profile are offset. With such an extension drill bit it is possible to work on the annular bottom of the extension borehole and thereby the bottom by breaking the material into the pre-borehole to be removed progressively deeper.

However, such a device inevitably requires a comparatively high structural effort, because care must be taken that the cutting rollers are arranged smoothly on their pins are.

The invention aims to create a device that can be expanded with significantly less structural effort of pilot holes permitted. The invention assumes that on a support body Drilling cutters are arranged along a self-contained curve and the support body is unbalanced vibration devices which drive this ring-shaped cutting edge into the mountains.

The device according to the invention is therefore a device for expanding boreholes with a cutting edge arranged on a support body along a self-contained curve, the What is new to see is that using at least one vibration or impact device the support body, the cutting edges formed as a ring cutting ring with outwardly inclined cutting edges are.

The vibration or impact devices can be electromagnetic vibration devices, unbalance vibration devices or impact devices of any embodiment, for example those that are operated with compressed air, act.

The device preferably consists of a device which is expediently pointed in the manner of a cutting edge at the lower edge Pipe part, on the upper edge of which a support for the vibration or impact device is placed, preferably is welded on.

To reduce wear, the pipe part, in particular in the case of devices with a comparatively low Diameter, consist entirely of a hard metal. For devices with a larger diameter would this embodiment become too expensive, and it is therefore proposed in a further embodiment of the invention, on the cutting edge of the pipe section on the ge extension percussion drill

Applicant:

J. C. Söding & Halbach, Hagen (Westphalia)

Named as inventor:
Karl-Günther Bechern,
Hagen (Westphalia) - Berchum

desired point to be welded on known hard metal pieces. You can do this in any way Depending on the intended use of the drilling device, the cutting edge completely or partially are covered with the hard metal.

The device according to the invention can also be used for the multi-stage expansion of boreholes, if you put several cutting rings on top of each other with a diameter decreasing towards the bottom of the borehole.

If necessary, the pilot hole can also be drilled directly with the expansion drilling device according to the invention by placing a roller drill bit in the axial direction of the extension drilling device, which, for example, consists of one or more drilling rollers, attaches.

With this application of the principle of the invention, however, it is expedient to use the vibration or impact devices to be chosen so that the device according to the invention performs a rotary movement about its axis. This can be done particularly easily with unbalance vibration devices, whereby it is expedient also the ring cutting rim is not continuous, but only occasionally occupied with cutting edges.

In this embodiment in particular, there will be several on or on the cutting rings Arrange vibration or impact devices in a wreath around the axis of the device.

Another possible embodiment of the device according to the invention is that each Impact or vibration device is assigned a separate sector of the cutting ring.

You can also make the arrangement so that the ring cutting rim is out of round, with one in this If you do not need to rotate the device.

To achieve the required pressure, it is also possible to use the vibration or impact devices load-bearing platform, which may also be used

709 578/5

Claims (7)

can be designed as a spoked wheel to put on weights. The whole device can also be connected to a linkage in order to achieve a rotary movement if necessary, but in any case a pressure on the device. The drawing shows exemplary embodiments of the subject matter of the invention, specifically in FIG. 1 shows a vertical section through a borehole with an inserted expansion drilling device according to the invention, FIG. 2 a multi-stage expansion drilling device according to the invention, FIG. 3 shows a plan view of an expansion drilling device according to the invention, FIG. 4 is a plan view of a modified embodiment of a drilling device according to the invention. One recognizes in FIG. 1 at 1 the pilot hole and at 2 the drilling wall of the enlarged borehole. A cutting ring 3 is seated on the bottom of the widening borehole, the cutting edge 4 of which is hardened in the exemplary embodiment and is expediently coated with hard metal. 5 and 6 indicate further hard metal linings. From Fig. 1 it can be seen that the cutting edge points outwards and in this way, as the drilling progresses, the borehole bottom breaks in the direction of arrow A into the pilot borehole. At its upper end, the cutting ring 3 carries a plate 7 which is optionally welded on. Instead of a plate, a spoked wheel can also be provided. The vibration device 8 is attached to the plate 7. The vibration device can be an electromagnetic device, an unbalance vibration device or an impact device preferably operated with compressed air. F i g. Figure 2 shows a multi-stage extension drilling rig in accordance with the present invention. One recognizes three platforms 11, 12, 13 connected to one another by bolts 9, 10, each of which has cutting rings 14, 15, 16, which gradually work through the borehole bottom 17 of the expansion borehole and break inward into the pilot borehole 13. From Fig. 2 shows an embodiment of the ring cutting rim, which consists of individual, spaced-apart cutting edges. At 8, the vibration or impact device can be seen again. F i g. 3 shows a plan view of an embodiment of a device according to the invention in which a plurality of unbalance vibration devices 19, 20, 21, 22, 23 and 24 are arranged on the platform 18. The direction of rotation of these unbalance vibration devices is the same, so that the platform 18 performs a rotary movement in the direction of the arrow, particularly when the cutting ring is formed with individual blades following one another at a distance. Of course, this rotary movement also occurs when the cutting edge is continuous. In the embodiment according to FIG. 4 sit on different segments 25, 26, 27, 28, 29, 30 percussion drills 31, 32, 33, 34, 35 and 36. With a suitable choice of the vibration devices 19 to or 31 to 36, a forced synchronization of the same results. Should this not be achievable, then appropriate, known technical means for synchronizing the individual vibration devices must be provided. Patent claims: 1. Impact drill for widening boreholes with on a support body along an in drilling cutters arranged in a closed curve, characterized in that using at least one Vibration or impact device (8) on the support body (7; 11 to 13) the drill bits (4) as Ring cutting ring (3) are formed with outwardly inclined cutting edges. 2. Apparatus according to claim 1, characterized by a cutting ring (3) which is preferably sharpened in the manner of a cutting edge and on the upper edge of which a carrier (7; 11 to 13) for the vibration or impact device (8) is placed, preferably welded. 3. Apparatus according to claim 1 and / or 2, characterized in that the cutting ring (3) consists of Carbide is made. 4. Device according to one or more of the preceding claims, characterized in that that on the cutting edge (3) hard metal linings (4, 5, 6) are welded. 5. Apparatus according to one or more of the preceding claims, characterized in that that several ring cutting rings (14,15,16) with decreasing diameter towards the bottom of the borehole are placed on top of each other. 6. Device according to one or more of the preceding claims, characterized in that that several vibration or impact devices (19 to 24) are arranged in a ring around the axis of the device. 7. Apparatus according to claim 6, characterized in that each impact or vibration device (31 to 36) is assigned a separate sector (25 to 30) of the cutting ring. 8. Device according to one or more of the preceding claims, characterized in that that the ring cutting ring (11, 12, 13) consists of individual, spaced apart from one another in the circumferential direction having cutting teeth. Considered publications:
German Patent No. 631,397;
German Auslegeschrift No. 1 024 458;
Austrian Patent No. 66,945;
British Patent No. 269,922;
U.S. Patent No. 1 726 598. 1 sheet of drawings 709 578/5 4.67 © Bundesdruckerei Berlin