CH632311A5 - Drilling tool for drilling holes widening in the drilling direction - Google Patents

Description

632 311 2

16. The drilling tool according to claim 1 or 15, characterized in that the axial bore (31) is connected to the vacuum source via a sealed suction element (14).

1.Drilling tool for drilling boreholes widening in the direction of drilling, with a rotating and axial 5

drivable tool shank, a sleeve concentrically connected to the tool shank, one against the force of a The invention relates to a drilling tool for drilling

Spring displaceably arranged in the sleeve, a for drilling ren of boreholes widening in the direction of drilling, with the drill head determined by the cylindrical borehole section, a rotating and axially drivable tool shank, a given drilling shank, and with axially and laterally outwardly 10 concentrically connected to the tool shank Sleeve,

displaceable cutting edges, which are seated on cutting edge carriers, which are arranged in channels against one another against the force of a spring in the sleeve, essentially over their entire displacement path, one for drilling the cylindrical borehole section.

are guided within the drill shank, characterized in that the drill shank carries a certain drill head, and with the channels (38) being open to the outside, the cutting edges being axially and laterally displaceable, which are resilient to the support (44), and that the outward-shifting 15 knife carriers are seated, which essentially cover their entire

Exercise of the cutting edges (36) is accompanied by increasing, reversible forbidden displacement in channels within the drill shaft leading to the cutting edge carrier (44). are.

2. Drilling tool according to claim 1, characterized in that such a tool is used for drilling cylin-that each side cutting edge (40) through a hard in the drilling direction and in the drilled hole inside the holes in the front end of the cutter holder (44) attached Hartme- 20 Rock or various building materials. In such tall edge (47) is formed. Tapered boreholes are, for example, tie rods,

3. Drilling tool according to claim 2, characterized in that high tensile forces and reliable holding function that the cutter carrier (44) and the hard metal cutting edge (47) is expected in used.

the open channel (38) are guided. A drilling tool of the type mentioned is from US PS

4. Drilling tool according to claim 2, characterized, 2 013 257 known. This and other known designs that the hard metal cutting edge (47) with its cutting support (44) of this type of tool have many disadvantages, because of which it is connected by brazing or welding. have not proven themselves overall in use. So there are still

5.Boring tool according to claim 4, characterized in that no known drilling tool for drilling conical holes in that the hard metal cutting edge (47) on an extremely hard rock or concrete to the tool axis, where only using an oblique-angled surface (45) of the cutting support (44) - 30 percussion drill drives can be worked. In addition, is brought with. the known tools inevitably

6. Drilling tool according to claim 2, 3 or 4, characterized in that the powdered rock is only interrupted by frequent work interruptions that the opposite of the hard metal cutting edge is possible by pulling out the tool. Furthermore, at the end of the cutter holder (44) there is no defined switching of the supporting anvil (42) with a known tool on the sleeve (25). 35 Drilling possible from cylindrical to conical.

7. Drilling tool according to claim 2, characterized in that the object of the invention is to design drilling tools at the outset that the cutter carrier (44) at least in the manner mentioned for the side in such a way that they are more reliable when the tool is in a long-lasting and cutting operating position Operation depending on the design is either curved in hard Abei-shaped. or in soft materials or even all of them

8. Drilling tool according to claim 1, characterized in that 40 materials can be used, with a reliably working chips — the bottom (39) of the channel (38) can be combined at least in places with the discharge device and is curved in the desired drilling in a parabolic manner. hole depth flawlessly and reliably from the first operating mode

9. Drilling tool according to claim 1, characterized in "cylindrical drilling" to the second operating mode "conical drilling" that the axial displacement of the drill shaft (30) or 30 a) are switchable.

relative to the sleeve (25 or 25 a) by actuating a 45 This object is achieved according to the invention in such a way

Trigger (73 or 86) can be initiated. that the channels are open to the outside, that the cutter carriers

10. Drilling tool according to claim 9, characterized in that they are resilient, and that the outward displacement of the net means that the trigger includes a reversible deflection of the cutting ring (68) which can be rotated relative to the sleeve (25) by cutting, and which is rotatable only goes hand in hand.

a first operating position the axial driving force on the 50 It has been shown that side cutting guided in this way also

Drill shaft (30) transmits, but in a second operating position with hardest rock and an impact drilling tool everyone passes it. Withstand the load and move forward smoothly

11. Drilling tool according to claim 10, characterized marked and remain displaceable backwards.

net that the link ring (68) can be rotated manually. The side cutting edges can advantageously be

12. Drilling tool according to claim 9, characterized gekennzeich- 55 tallschenken be occupied, each at the end of a resilient net that the trigger by a with the sleeve (25 a) coupled cutter holder are attached. If the cutting ring support ring (86) is formed, which leads to a predetermined cylindrical borehole depth, including the hard metal cutting edge, in the side channel when the surface is reached, the connection zone between the hard metal and the drilled material is supported. Cutting edge carriers are not permitted, even in percussion drilling operations

13. Drilling tool according to claim 10, characterized marked 60 exposed to high load.

net that the link ring (68) by a locking device (66) in order to initiate the driving forces, it can be advantageous

can be fixed in its various operating positions. the end of the cutting edge opposite the hard metal cutting edge

14. Drilling tool according to claim 1, characterized in that the carrier is net with an anvil supported on the sleeve, that the drill head (35) and the drill shaft (3) are provided with a. For optimal power transmission in the relatively thin through axial bore (31, 37) are provided. 65 elastic knife carriers, it can be advantageous if these

15. Drilling tool according to claim 14, characterized gekennzeich- run at least partially parabolic curved. To the net that the axial bore (31) is connected to a vacuum source. Supporting the parabolic power transmission, it can be closed. be convenient to guide the bottom of the channel to the side

cut at least in sections also to curve parabolically.

In the "conical drilling" operating mode, the axial displacement of the drill shaft relative to the sleeve, which leads to the extension of the side cutting edges, is advantageously initiated by a special trigger. For example, this trigger can include a link ring that is rotatable relative to the sleeve, which only transmits the axial drive forces to the drill shaft in an operating position assigned to the cylindrical drilling, but passes it by in a second operating position assigned to the conical drilling.

As an alternative to this, in particular in the case of drilling tools provided for relatively soft materials, the trigger can be formed by a support surface on the sleeve which is supported on the surface of the drilled material when a predetermined borehole depth is reached. With a trigger designed in this way, particularly soft materials, such as aerated concrete, foamed plaster and the like. The like. Drill cylindrically and conically in the desired manner.

For a perfect discharge of the drilling dust that occurs, it can be advantageous to axially drill through the drilling shaft and the drilling head and to connect this drilling to a suction source during drilling operation. For this purpose, the tool shank can be provided with a rotating and sealed suction nozzle.

Some preferred exemplary embodiments of the invention are explained in more detail below with reference to a drawing. In it show:

1 is an axial section through a first embodiment of a drilling tool,

FIGS. 1a and 1b each show a section running approximately through the plane I-I of FIG. 1 with a link ring taking up different operating positions;

2 shows a section through a modified drilling tool;

FIG. 2a shows a view from arrow direction “A” in FIG. 1 onto a drill head of the tool from FIG. 2;

Fig. 3 is a broken longitudinal section through a third drilling tool, and

3a shows a view from direction “B” in FIG. 3 of a drill head of this drilling tool.

The embodiment of a drilling tool shown in FIG. 1 for drilling cylindrical and conically enlarged holes is designed especially for use in extremely hard rock or concrete types and is preferably inserted into the chuck of a pneumatic or electromechanical hammer drill with the clamping pin 11 of its hollow tool shaft 10 clamped.

Between a flange on the tool shaft 10 and a spring ring 13, a suction member 14 is rotatably mounted on the outer circumference of the tool shaft with a sliding fit and with seals 17 interposed, which is connected via openings 20 in every position to a hollow interior 19 of the tool shaft 10 and via a nozzle 15 for a hose can be connected to a vacuum wave, not shown. This nozzle 15 on the suction member 14 is used to extract drilling dust through the hollow drilling tool.

Within a sleeve firmly screwed to the lower end of the tool shank 10, a drill shank 30 provided with a through bore 31 is guided axially displaceably against the force of a helical compression spring 27. The compression spring 27 is supported on the top on an intermediate ring 65, which is connected to the sleeve 25 by at least one pin 64, and on the underside on a metal ring 28, which rests on a central flange of the drill shaft 30 via a sealing ring 29. By means of this compression spring 27, the drill shaft 30 is normally pressed into its extended position shown in FIG. 1.

The drill shaft 30, which is provided with a shoulder 32 in its lower region, carries 316 at its lower end in the passage 631

gangsbohr3131 a thread into which a drill head, which is preferably equipped with hard metal cutting edges 36 and has a conical outlet opening which is in alignment with the through bore 31 of the drill shaft, has a screwed jst. _

The drilling tool shown in FIG. 1 has at the lower end of its drilling shaft 30 two diametrically opposed side cutting edges 40, each of which is guided in a longitudinally displaceable manner in a guide groove 38 milled axially into the drilling shaft. For reasons of simplification, however, only a single side cutter 40 is shown in its guide groove 38 in FIG. 1. Each side cutting edge 40 consists of an elastic, preferably made of spring steel and at least partially parabolic curved cutting support 44, a hard metal cutting edge 47 brazed to the lower end of the cutting support and an anvil 42 attached to the upper end of the cutting support. The anvil 42 absorbing the axial forces from the tool is between the lower end of the sleeve 25 and a threaded ring 50 screwed onto it and firmly supported against an shoulder of the sliding shaft 30 in the sleeve by an elastic insert. The hard metal cutting edge 47 is soldered onto an inclined surface 45 at the lower end of the elastic cutting edge support 44. This ensures better power transmission in the area of the solder joints.

As can be seen in FIG. 1, the bottom of the guide groove 38 behind the end of the cutting support 44 carrying the hard metal cutting edge 47 is slightly parabolically curved and extends obliquely outwards in the direction of the drill head 35. This curved section 39 is of particular importance. To produce a conical borehole, namely, the drill shaft 30 is inserted into the sleeve 25 in a manner described later, and the end of the cutter carrier 44 carrying the hard metal cutting edge 47 slides over the curved section 39 in the bottom of the guide groove 38 into the oblique part leading outwards Guide groove 38 a, d. that is, the carbide cutting edge 47 increasingly extends beyond the circumference of the drill shaft 30, a conical borehole is produced. It should be noted that even as the hard metal cutting edge 47 protrudes out of the guide groove 38, a piece of the cutting edge (due to the inclined surface 45) remains supported on the edge of the guide groove 38. In this way, even with the hardest impact drilling stress, it is avoided that the hard metal cutting edges 47 can be broken out. The threaded ring 50 is secured against unintentional loosening by a locking device formed from ball 52, compression spring 53 and depressions in the interior of the threaded ring.

As already indicated, the drilling tool shown in FIG. 1 can be operated in two operating modes: cylindrical drilling with the drill head 35, and conical drilling with the progressively extended side cutting edges 40.

The operating modes are dependent on the position of an adjusting ring 73 serving as a changeover switch, which is surrounded on the outside with a knurled jacket 74 and can be rotated manually relative to the circumference of the sleeve 25 between the “cylindrical drilling” and “conical drilling” operating positions.

The sector of rotation between the two operating positions is determined by one or more circumferential slots 71 milled into the circumference of the sleeve under the adjusting ring 73 and one pin 69 in each circumferential slot. Each of these pens. 69, of which only one is shown in FIG. 1, is used to couple the adjusting ring 73 to a sliding ring 68 located inside the sleeve 25 and shown separately in FIGS. 1 a and 1b. This sliding ring has in addition to a central bore through which the upper one tapers End of the drill shaft 30 is passed, two diametrically opposite dovetail

3rd

5

10th

15

20th

25th

30th

35

40

45

50

55

60

65

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Similar recesses 70, which extend approximately 90 ° over a sector of the second retracted end position described below. Connection with conical drilling.

1 is located below the link ring 68. In contrast to the embodiment of FIG. 1, a flange of the drill shaft 30, which up to a shoulder of the tool designs of FIGS. 2 and 3 is partially milled, takes place, so that two Dovetail-like 5 "cylindrical drilling" to "conical drilling" did not occur manually and flange sections 62 remained. Behind everyone through a collar, but automatically after reaching one

There is an undercut 61 in the flange section at a predetermined cylindrical borehole depth, in which case the associated pin 64 is axially displaceable, namely an axially connected to the drill shaft 30a.

is guided when the drill shaft 30 moves relative to the sleeve, but slightly rotates to 25 by means of a ball bearing 84. At the end of the drill shaft 30 there is a support ring 86 mounted thereon on the surface of the drilled material secured by a spring ring and supported against the interior 19 material.

of the tool shank 10 sealing lip seal 59. In this way there is an automatic switchover from

When drilling a borehole, the adjusting ring is first drilled cylindrically to conical, no operating interruption is brought into its operating position (cylindrical drilling), and this is necessary. In the further course of the drilling process, the link ring 68 takes the relative 15 shown in FIG. 15, the hard metal cutting edges 47 arrive at their ends here with respect to the drilling shaft 30, i. H. the still-44a designated elastic cutter support on a sloping NEN parts of the link ring are supported on the flange section 39a in the bottom of the guide grooves 38a for the side ends 62. In this operating position, the full axial force of the cutting 40a and while the tool shank 10a tool shank 10 is now transferred to the drill head, the side with the sleeve 25a continue to be retracted in the drilling direction compared to the cutting 40 only. As soon as a desired cylinder shaft, which is still rotating but no longer driven, has reached the drill hole depth, the drilling tool is briefly moved 30a further, the hard metal cutting edges 47 are stopped and the adjusting ring 73 is rotated by 90 ° until the sliding ring extends outwards.

68 the relative position shown in FIG. 1b with respect to the drill shaft. In the exemplary embodiment from FIG. 2, the upper 30 have been adopted. Incidentally, the link ring 68 snaps into the ends of the cutter carriers 44a and is bluntly cut off.

each of its two operating positions. For this purpose, see sleeve 25a and a screwed threaded ring 50a of the link ring 68 is provided on the underside with lugs 66 which are clamped in.

corresponding recesses of the pin 64 opposite as can be seen from FIG. 2a, the drill head of the sleeve 25 has an intermediate ring 65 which engages. As soon as the 35a has two lateral suction openings 37a, tool shank 10 in the operating position “tapered drilling”, which are connected to the through hole 31 in which it is rotating and driven with impact, 30 shank 30a rotates and serves to discharge drilling dust. Since the drill shaft 30 continues to rotate in the cylindrical borehole during conical drilling, the drill head 35a rotates with it, but the axial force including the impact is not driven forward, so it takes over the Zermah and past it and now via the sleeve 25 onto the len and discharge of produced during conical drilling

Side cutting 40 directed. The lower ends of the cutting-drilling waste.

Carrier 44 with the hard metal cutting edges 47 slide, as already 35. After the drilling process has been completed, the drill shaft is described, via the parabolically curved section 39 30a through the compression spring 27a again into the guide groove 38 shown in FIG. 2 into the oblique groove section, normal position pushed back.

which determines the pitch angle of the conical bore. By a corresponding curvature in the elastic

Since the through-hole 31 through which the drilling dust is removed is carried out by the cutting carriers 44a, the power transmission is sucked out, it opens out at the drill head 35, it is favorable to 40 the carbide cutting edges 47 again essentially arcuate if the drill shaft 30 is also conical Continue drilling mig. As can also be seen in FIG. 2, the sapling 86 also rotates, since the flour produced during conical drilling can now also be sucked off the ball bearing 84 on an enlarged foot section 82. Drill shaft 30a, in which the guide grooves 38a continuously

In the modified shown in FIGS. 2 and 3 are milled. In this way, the side cutting edges 40a

Exemplary embodiments are details which are guided through the embodiment under the ball bearing.

1 are substantially identical, with the same. The embodiment of FIG. 3 is that previously associated with

Reference numerals, and such details, which are slightly similar to FIG. 2 and have largely similar and even dimensions, with the addition 'a' or 'b', preferably for editing relatively soft or drawing. The description of the designs of FIGS. 2 and 3 porous materials designed. In the case of a relatively long axial, therefore, the stroke of his drill shaft 30b can essentially be limited to such features as compared to that which is only broken off here; the tool shaft 10b shown in FIG. 1 in design and / or function are substantially different from the elastic ones. Knife carrier 44b formed relatively long and at their upper

The drilling tool provided in FIG. 2 is preferably not angled at the ends, but is straight and is clamped to produce cylindrical and conically enlarged drilling holes between a retaining ring 92 and the tool shank by means of clamping screws 93 foamed in relatively soft materials, such as aerated concrete. In contrast to the previously plaster or the like, provided. On the hollow tool shank 10a with the designs described here, the hard metal cutting spigot 1 la is sealed, the suction element 14 with the socket 47b is not attached to an inclined surface of the cutting support, but 15, and is hard-soldered via the opening 20 to the interior 19 on the continuous upper side thereof. Dage-connected to the tool shank. Between one end of the tool shaft 10a, which is screwed on under the hard metal cutting edges, and a tool holder, which is located under the hard metal cutting edges, is tapered on its lower guide grooves 38b parallel to the oblique section 39b, which is axially displaceable, relative to a cutting edge support.

End of a drill head 35a with cutting edges 36a and centering mandrel 89. Because of the long axial stroke of this tool design, the load-bearing drill shaft 30a has a screw pressure between the inner drill shaft 30b and the compression spring 27a. Pins of 27b on the one hand and the enlarged foot section 82b ande-64a are inserted in transverse bores of tool shank 10 and a thin intermediate sleeve 95 is inserted on the outside by a retaining ring 79 on the outside, and is held on. These pins 64a engage in longitudinal cutouts which can also support the hard metal cutting edges 47b on the inside.

Drill shaft 30a and determine both in FIG. 2 As in the embodiment of FIG. 2, the ball bearing 84b is supported by a flange 81b for the illustrated end position of the drill shaft 30a and its support ring 86b. In the silence-

If the drill shank 30b were lying, a support ring 100 abuts the upper end of the compression spring 27b on the narrow end face of a thin tube section 99 of the tool shank 10b which engages in the intermediate sleeve 95.

5 632 311

For use in calcareous lightweight building materials, especially gas concrete, gypsum boards and. Like. The outer surface of the drill head 35,35a or b is advantageously hard chrome-plated, because the drilling dust tends to form hard particles.

M

3 sheets of drawings