DE8011374U1 - DRILL UNIT INTENDED FOR PRODUCING HOLE HOLES - Google Patents

Description

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PM 1419

For the production of boreholes certain i |

Drilling unit: I

The invention relates to a drilling unit made of a drill shank for the production of drill holes with undercuts and with this connected drilling tip, which apart from the face cutting edge the drill shank radially protruding side cutting edges has, and which can be fixed with a on the drill shaft Stop sleeve is provided, which is located in a recess of a stop plate pushed over the drill shank to form a Pivot bearing supported.

Such a drilling unit makes it possible to produce bores with undercuts in the borehole depth in a simple manner by swiveling the drill when the desired drill hole depth is reached. The stop plate takes it the contact pressure generated during the drilling and swiveling process. For the production of boreholes with different Borehole depth, it is known to move the stop sleeve on the drill shank and, for example, by a in the wall of the Fix the stop sleeve inserted stud screw on the drill shaft in the desired position. Such a determination the stop sleeve is only suitable for use in soft building materials, as it is used in these building materials for production the drilling no impact action of the drill is required. When making drill holes with undercuts in However, impact drills or rotary hammers are required for concrete. If the stop sleeve is fixed on the drill shaft with a stud screw or similar locks, the Impact effect an adjustment of the stop can occur by loosening or shearing off the stud screw.

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The invention is therefore based on the object of creating a fixation of the stop sleeve that also has the impact from impact drills and rotary hammers.

According to the invention this is achieved in that the The chuck engaging part of the drill shank has a reinforced diameter to form a stop which the stop sleeve abuts with its side facing away from the borehole.

This design results in a direct transfer of the contact pressure and the impact effect from the stop sleeve via the stop of the drill shank and the drill chuck on the hammer drill. A shift in the stop sleeve and thus an adjustment of the set drill hole depth is no longer possible. As before, however Different drill hole depths can be set using different lengths of the stop sleeve.

In a further embodiment of the invention, the stop of the drill shaft designed as a shoulder and a threaded portion can be arranged in front of the shoulder on which the Stop sleeve with a corresponding internal thread can be screwed to fix it on the drill shaft. By the Locking the stop sleeve against the shoulder of the drill shank creates a firm, twisting the stop sleeve opposite the drill shaft exclusive connection.

In a further addition to the invention, the stop on the drill shaft can be designed as a cone and that of the borehole have the opposite side of the attachment sleeve the corresponding counter cone.

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Through this design, the contact pressure and the impact effect distributed over a larger area, so that a smaller one Wear occurs. In addition, the conical connection also secures the stop sleeve at the same time achieved.

Finally, you can put the Stop sleeve have two opposing longitudinal slots on their inner bore. This design is necessary if the part of the drill shank that engages in the drill chuck has an outer diameter corresponds to the outer dimension of the side cutting edges of the drill bit. In order to form a stop, the through-hole of the stop sleeve is then namely smaller than the outer dimension of the drill bit.

Exemplary embodiments of the invention are shown in the drawing. Show it:

FIG. 1 the drilling unit with the stop sleeve and stop plate slipped over it

Figure 2 shows the section along the line I-I FIG. 3 shows the section along the section line II-II

FIG. 4 shows the drilling unit with a stop designed as a cone

The drilling unit consists of the drill shaft 1 and the one with this connected drilling plate 2. This has, in addition to the face cutting edge 3, also side cutting edges projecting radially beyond the drill shank 4, 5 on. For the removal of drilling dust, the drill shank is provided with grooves 6 which wrap around the shank in a helical manner.

PM 1419

In a distance determining the hole depth, the stop sleeve 7 is arranged on the drill shaft 1, which is attached to the through the diameter thickening of the one engaging in the drill chuck Part 1 a of the drill shaft resulting shoulder 8 abuts. To fix the stop sleeve 7 on the drill shaft 1 is A threaded section 9 is arranged in front of the shoulder 8, onto which the stop sleeve 7 with its corresponding internal thread 10 can be screwed on. In order to execute the pivoting movement for the formation of the undercut 11, the stop sleeve 7 has a convex end face 12, which is in a trough 13 of the the surface of the masonry 14 resting stop plate 15 is supported. This results in a pivot bearing that it enables the drill shaft 1 to be swiveled out during the drilling process and the undercut 11 of the borehole by stirring 16 train. The stop plate 15 is additionally provided with a housing 17 which is used to collect the drilling dust is used especially when drilling holes in ceilings. To guide and hold the stop plate, it has a sleeve-shaped, centering lug 18 engaging in borehole 16. In order to slip over the stop plate 15 and the stop sleeve 7 to enable via the drilling plate 2 in the illustrated conditions are in the area of the internal thread 10 of the stop sleeve 7 as well as in the area of the centering shoulder 18 engaging in the borehole 18 longitudinal indentations 19 / 20 provided, which are matched to the dimensions of the drilling plate 2, (see Figures 2 and 3)

To make it easier to replace when the drill bit 2 is worn, as well as to create a possibility to adapt the drilling unit for different drill chuck holders can the part 1a of the drill shank that engages in the drill chuck has an internal thread 23 into which the drill bit 2 load-bearing part 1 can be screwed in.

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Figure 4 shows an embodiment of the stop in the form of a on the drill shank arranged cone 21 and a corresponding mating cone 22 on the side of the stop sleeve facing away from the borehole 7th

Claims (5)

■ ti ttt ·· »«. »« · Dr. h: c. Artur Fischer Tumlingen / Waldachtal April 23, 198O Ju / Woe PM 1419 claims 1. For the production of boreholes with undercuts certain drilling unit made of a drill shaft and a drill bit connected to it, which apart from the face cutting edge has side cutting edges protruding radially over the drill shaft, and which is provided with a stop sleeve which can be fixed on the drill shaft and which is located in a recess over the drill shaft pushed stop plate is supported to form a pivot bearing, characterized in that the engaging in the drill chuck part of the drill shaft has a reinforced diameter to form a stop against which the stop sleeve abuts with its side facing away from the borehole. 2. drilling unit according to claim 1, characterized in that that the stop of the drill shaft is designed as a shoulder and a threaded section is arranged in front of the shoulder, onto which the stop sleeve is connected to a corresponding one internal thread can be screwed to fix it on the drill shaft. ϊ . · '■' ' \ PM 1419 • · • · · · • ■ • • · • · I. •
• • · is; It k - 2 - k I. 3. Bohjreinheit according to claim Ί, characterized in that the stop on the drill shank is designed as a cone (and the side facing away from the borehole is the stop sleeve has the corresponding mating cone. 4. Drilling unit according to claim 1, characterized in that that to slip over the drill plate, the stop sleeve has two opposing, longitudinally extending slots on its inner bore. j 5. drilling unit according to claim 1, characterized in that 'the drill shaft consists of two parts, the Drill plate carrying part can be screwed into the reinforced diameter part of the drill shaft.