Suction device for a rotary or percussion hand drill.

The invention relates to a suction device for hand-guided drilling and chiseling councils with a suction head and a rod for slidably mounting the device, wherein the suction head is designed in such a pot-shaped, that the opening has in the machine direction and at least along part of its circumference surrounded by a wall of floor the machining direction is remote and a suction opening for an external extraction and a passage is provided for use of a device in the tool into the ground.

Suction devices for hand-guided drilling and chiseling councils which have a suction opening for an external extraction, for example in the form of an industrial vacuum cleaner, are used in a considerable extent. In most cases, such suction devices are connected slidably via a linkage with the unit, often a linkage cooperating with the adjusting nut is provided so that such a suction belongs also function as a depth stop. In addition, another cooperating with the rod adjusting nut is provided in most cases against the machining direction spring-mounted suction, so that can be done to adapt to each reaching to use tools.

A disadvantage of all these known suction devices, to which also belongs from DE-AS 24 36 023 is the fact that in the suction heads dust from accumulating so that the suction effect no longer fully brought to bear. Blame for these deposits is usually the flow unfavorable interpretation of the suction heads, as these in shape on the one hand have to be adapted to the device, where the suction devices are provided and on the other by the shape of the suction heads accessibility, for example, in corners, should not be too much for Disabled , In addition, is also made of fluidic point of view, the vote of the passage on the reaching for use tool not just because its for a sufficient clearance for the suction of air present needs and on the other, the clearance between the passage opening and the tool may not be large, that dust will escape at this point.

The invention has for its object to provide a suction device, which is aerodynamically designed so that on the one hand, the full suction power available and that no deposits of dust on the other hand in the drill head.

According to the invention the object is achieved in that at the bottom of a substantially normal thereto is arranged, extending from the suction opening to the passage opening baffle for dividing the area enclosed by the ground and the wall space into at least two, suction opening and the passage opening, partial chambers is arranged at least joined with each other.

Due to the inventively provided guide plates the resulting subspaces form separate suction channels, which connect the passage opening with the suction opening. The scope of the passage opening is therefore covered by this separately available suction channels. This creates substantial high flow velocities in these suction channels, which prevents the formation of vortices and related deposits of dust. In addition, these separate suction channels have the advantage that in blocking a channel by any larger parts, suction can be total not hampered because of the or the other channels with the full suction capacity still available.

Thus the subspaces fulfill its function as a separate suction acting in full, corresponding to the height of the baffles with advantage substantially the height of the wall. This form to support the suction head at the estate to be processed fully closed, acting as a suction compartments.

To improve the above-mentioned effect, ie the completion of the partial spaces opposite the Good to be processed, the free ends of the wall and fins with a rubber-elastic sealing lip are expediently provided. Such a sealing lip can be applied by gluing, clamping or the like on the walls and the baffles. A corresponding supernatant of the free ends of wall and baffles promotes elasticity of the sealing lips. In the event of leaks in by wear or the like, the sealing lips can be exchanged, so that the remaining part of the suction device can still be used.

An optimum effect is achieved if along the entire circumference of the opening is the same suction power available. To fulfill this condition, the peripheral portions of the opening between each respective adjacent baffles are substantially equal advantageous.

Particularly when using a suction device in conjunction with larger diameter tools, such as diamond bits, through openings of large diameter are required. This results in that the suction head has to cover a relatively large area of ​​the processed material. In order to create optimal fluidic conditions in this case, at a suitable for this purpose suction head preferably three baffles to form three compartments are provided.

Although suction devices of the type in question have many benefits, they are often not used because it the distraction of the machining point. In particular, the exact touchdown of the tool can not be viewed. To resolve also this drawback, closes according to a further embodiment of the invention at the passage opening radially, and a bottom wall passing through recess having substantially the diameter of the passage opening of a corresponding width on. Such, both ground and wall penetrating recess gives the view freely on the tool tip. However, especially with such a recess is the fluidic design of the suction head of epic proportion, so that dust can not escape. The inventively provided guide plates also provide here a fluidic such optimization that the suction power is fully guaranteed without leakage of dust.

The recess also contributes significantly to the ease of handling the exchange of tools. Due to this recess, the tools can be fed laterally through the cut-through to the device axis, and then axially inserted into the device. This shortens very much the way and thus the time for the insertion and removal of tools. An adverse axial passage of the entire tools by the suction head, as is required with conventional suction devices, can be avoided.

The invention will now be explained in more detail based on, for example, reproducing drawings. Show it:<ul><li>. Figure 1 is an example mounted on a drill suction device according to the invention;</li><li>Fig. 2 is a plan view opposite to the machining direction of the suction head of the suction device according to Fig. 1;</li><li>FIG. 3 is a side view of the head-end portion of the suction device according to FIG. 2; </li><li>Figure 4 is a plan view, contrary to the machine direction to a suction head of another suction.</li><li>Fig. 5 is a side view of the head-end portion of the suction device of FIG. 4.</li></ul>

Fig. 1 shows a suction device 8 with the suction head 9 and rod 10, mounted on a drilling rig 1. In a tool holder 2 of the provided with a handle 3 and an auxiliary handle 4 drilling rig 1 a tool 5 is inserted. This tool 5 passes through a recess 11 of the suction head 9, so that the tool 5 to its tip is towards visible.

Assembled, the suction device 8 to the unit 1 via a tensible the auxiliary handle 4 clamp 6. clamp between 6 and suction head 9 is a linkage provided 10 surrounding spring 7, against which the suction device 8 is opposite to the machining direction displaced. The adaptation of the Absaugörrichtung 8 to the length of the tool used is a 5 cooperating with the linkage 10 adjusting nut 12th

The linkage 10 serves in the present example, the connection of the suction head 9 with a tube 13 of the external dust in the drawing, not shown.

From the plan view, contrary to the machining direction of the suction head 9, the suction device 8 shown in FIG. 2, the suction opening 14 and the passage opening 15 can be seen. Between the suction opening 14 and through opening 15 a guide plate 16 is arranged, which, 9b creates two partial spaces 9a. FIG. 2 further illustrates how radially to the passage opening 15, the bottom 17 and wall 18 passes through recess 11 adjoins.

From Fig. 3 it can be seen how the wall 18 with sealing lips 18a and the guide plate 16 are provided with sealing lips 16a. In addition, this figure shows the connection of the suction opening 14 to the external vacuum extraction producing linkage 10 in the form of a tube.

The different in the suction head 21 Suction 20 as shown in FIGS. 4 and 5 is particularly suitable for drilling larger diameter, for example, diamond drill bits. For this purpose, the suction head 21 in turn to a through-opening 22 and a suction 23rd The passage opening 22 exceeds in this case, the suction opening 23 by a multiple.

Between 23 and suction passage opening 22 are three plates 24, 25, 26, which provide three compartments 21a, 21b, 21c. be limited these partial spaces of the wall 27 and the bottom 28 sealing lips 24a, 25a, 26a represent the baffles 24, 25, 26 in conjunction with sealing lips 27a of the wall 27, the seal to the well to be processed safely. For connecting the suction opening 23 with the external dust again is designed as a drill pipe 29th