Drilling device

Abstract

The invention relates to a drilling device, in particular a rock drilling device, comprising a working unit (3) for processing a workpiece, comprising a carrier unit (4), in particular arranged along an axis of rotation (9), for supporting the working unit, a transport unit (5) for transporting particles, and a cover unit (6) for covering the carrier unit. According to the invention, when viewed along the axis of rotation, the cover unit covers / overlaps the working unit and the carrier unit.

Description

[0001] R. 417497

[0002] - 1 -

[0003] Description

[0004] title

[0005] Drilling device

[0006] The invention relates to a drilling device according to the preamble of claim 1.

[0007] Drilling tool devices with a cover unit are known from the prior art.

[0008] The invention is based on the objective of improving a drilling device for a [missing word] using simple design measures.

[0009] The problem is solved with a drilling device, in particular a rock drilling device, with a working unit for processing a workpiece, with a support unit, in particular arranged along an axis of rotation, for carrying the working unit, with a transport unit for transporting particles and with a cover unit for covering the support unit.

[0010] It is proposed that the covering unit, viewed along the axis of rotation, covers / overlaps the working unit and the support unit.

[0011] The cover unit is intended to seal a space between the cover unit and the working unit or the carrier unit.

[0012] The present invention can reliably reduce or prevent the generation of an exhaust airflow from a circumferential side of the drilling device. This prevents the main exhaust airflow from being weakened by a kind of bypass. This allows for the application of R. 417497

[0013] - 2 - in a particularly simple way, a leakage is prevented on the one hand and a game between on the other hand is made possible.

[0014] To improve workplace safety, the drilling device described here can prevent or at least reduce the contamination of the work environment with particles. This is achieved, in particular, by reducing or preventing the uncontrolled distribution of chippings and especially fine particles into the surrounding area or air during initial drilling. As drilling progresses, the borehole can be effectively cleaned, thus preventing the need for excessive post-treatment of the borehole when, for example, installing a chemical anchor, and eliminating any particles at an early stage.

[0015] The drilling device, in combination with a suction device, can provide an additional negative pressure, particularly to the suction pressure of the suction device, which effectively captures or prevents particle exposure or chipping, especially during drilling.

[0016] The drilling device can be configured to penetrate the workpiece in the feed direction during operation. The feed direction of the drilling device preferably coincides with a longitudinal axis or a rotational axis of the drilling device and is aligned from the support unit towards the working unit.

[0017] The drilling device can be designed as a rock drilling device for processing rock such as concrete, hollow concrete, brick, etc. The drilling tool can be configured for a cutting and / or a thrusting motion. In a cutting motion, the drilling tool has, in particular, a cutting element that is rotated or turned about a longitudinal axis (axis of rotation) of the drilling tool. In a thrusting motion, the drilling tool has, in particular, a thrusting element, preferably a chisel element, which is moved along a longitudinal axis. The cutting element and the thrusting element can be R. 417497

[0018] - 3 - formed in one piece or as a single unit and preferably arranged on a working unit. The cutting element and / or the thrust element can form a drilling element for drilling workpieces. The drilling tool can have a working unit and a support unit arranged on the working unit, in particular directly connected to it. The working unit can be designed to machine a workpiece. The support unit can be designed to hold the working unit and / or to mount it on a hand-held power tool. The working unit can be arranged at a first end of the drilling device. The support unit can be arranged at a second end of the drilling device, away from the first end. The support unit can have a support element, in particular extending along the axis of rotation.

[0019] A machining unit is provided for processing a workpiece. The machining unit can be designed, particularly at its end face, for direct and / or indirect contact with the workpiece. The machining unit can be essentially formed from a material or material composition different from that of the carrier unit. The machining unit can essentially contain or be formed from a hard metal. Suitable hard metals or hard metal compositions include, for example, tungsten carbide (cobalt-carbide) (WC-Co), titanium carbide, tantalum-niobium carbide, zirconium carbide (ZrC), titanium nitride, etc.

[0020] A support unit, in particular arranged along an axis of rotation, can be provided to carry the working unit. The support unit can be elongated, in particular rod-shaped. The support unit can be designed as a support shaft. The support unit can be designed for mounting by means of a hand-held power tool, preferably a rotary hammer and / or a percussion drill. For this purpose, the drilling device can have a receiving unit at an end facing away from the working unit. The receiving unit can be designed for coupling with a hand-held power tool such as a rotary hammer. The drilling device can be designed such that it can be coupled to a tool holder of the hand-held power tool. The drilling device can have a recess, in particular a recess R. 417497.

[0021] - 4 - feature a designed, positive-locking element that forms at least part of an SDS-plus interface, an SDS-max interface, or the like. The carrier unit and the receiving unit may be formed in one piece.

[0022] The support unit can be formed from a support element, in particular one extending elongated or along the axis of rotation. The working unit can have a connection area, in particular a planar one, which can be connected to a connection area of ​​the support unit, in particular by a material bond. The connection areas can be almost identical to each other. The connection area of ​​the working unit can be larger than the connection area of ​​the support unit. The connection areas can, in particular, completely overlap. The working unit can be formed or connected to the support unit in one piece, in particular by a material bond, preferably by a welding or brazing process.

[0023] A transport unit can be provided for transporting particles. The transport unit can be designed to extract particles along the drilling device. The transport unit can extend from the working unit to the support unit. The transport unit can extend through the working unit and the support unit. The transport unit can extend parallel to the axis of rotation. The transport unit can be arranged at the end face of the working unit. The transport unit can have an extent that increases radially along the axis of rotation and from the working unit towards the support unit, and / or from the working unit towards the support unit. The transport unit can have a transport surface that defines its boundaries. The transport surface can have a transport surface segment angled relative to the axis of rotation.The transport surface can have a transport surface section parallel to the axis of rotation. The angled transport surface section can merge into the parallel transport surface section. The transport unit, particularly when arranged on a work unit, can have a first radial distance from the axis of rotation. The transport unit, particularly when arranged on the carrier unit, can have a distance along the axis of rotation as seen in R. 417497.

[0024] - 5 - have a second radial distance relative to the axis of rotation, spaced apart from the first radial distance. The second distance can be greater than the first distance. This ensures reliable particle extraction.

[0025] The transport unit can be, in particular completely, surrounded by the working unit and / or the carrier unit and the cover unit. The transport unit can be located inside and / or outside the unit. The transport unit can be linear along the axis of rotation and / or curved around the axis of rotation.

[0026] The transport unit enables the extraction of dust particles generated at or by the drilling device. The working unit is fluidically connected to the support unit and the cover unit. A negative pressure can be applied to the support unit, creating an airflow from the working unit to the support unit. This airflow can then be drawn through the entire drilling device. As a result, dust particles (drill cuttings) can be extracted directly at their source, i.e., at the working unit.

[0027] A cover unit can be provided to cover the carrier unit. The cover unit can extend from the carrier unit to above the working unit. The cover unit can overlap the working unit. The cover unit can be arranged on a circumferential region of the working unit. The cover unit can surround both the working unit and the carrier unit. Viewed along the axis of rotation, the cover unit can cover less than 60%, in particular 50%, preferably 40%, and most preferably 30%, of the maximum extent of the working unit.

[0028] It may be advantageous for the cover unit to have an (inner) diameter that is larger than an (outer) diameter of the support unit. The cover unit may have an (inner) diameter that, particularly when viewed sectionally along the axis of rotation, is larger than, in particular, a maximum (outer) diameter of the working unit. The cover unit may have, in particular, a maximum (outer) diameter R. 417497

[0029] - 6 - which, particularly when viewed in the circumferential direction around the axis of rotation, is section by section larger than, in particular, a maximum (outer) diameter of the working unit. The cover unit can have an (outer) diameter which is smaller than, in particular, a maximum (outer) diameter of the working unit. This allows for simplified assembly and disassembly of the cover unit by flexibly adapting it to the carrier unit, regardless of its exact diameter and form tolerances.

[0030] It may be advantageous for the cover unit to be essentially hollow cylindrical. The cover unit may also be tubular. The cover unit can extend along the axis of rotation between a first end of the drilling device, in particular the working unit, and a second end of the drilling device, in particular the support unit, located away from the first end. The cover unit can have a wall thickness greater than 0.5 mm and / or less than 2 mm, and in particular approximately 1 mm. The cover unit can be arranged coaxially with the support unit and / or the working unit. This allows for low weight and material consumption of the cover unit while simultaneously ensuring sufficient stability and protective function through the optimized wall thickness in the hollow cylindrical or tubular design. The defined extension ensures targeted coverage of the relevant area.

[0031] It may be advantageous for the cover unit to be movably mounted relative to the working unit along and about the axis of rotation, particularly in an overlapping state, and / or to be connected by means of an interference fit and / or by means of a connecting element, particularly a positive-locking connection. The term "movably mounted" can refer to an arrangement in which a part or component is mounted in such a way that it can move relative to a fixed structure or another part. This mobility can include linear displacement, rotational movement, or a combination of both. The mounting can be achieved by various mechanisms such as joints, guides, or other suitable devices that allow controlled and repeatable movement. The purpose of this movable mounting is to comply with R. 417497.

[0032] - 7 - to increase the functionality and adaptability of the overall system by allowing a flexible response to external influences or operational requirements. In particular, this can refer to a clearance fit, which allows multiple degrees of freedom and preferably does not preload components against each other. The term "connected by means of an interference fit" can refer to a joining technique in which two components are joined by a tight fit, resulting in a firm and permanent connection. In an interference fit, a component (e.g., working unit) that is slightly larger than the corresponding receiving opening (e.g., cover unit) of the other component is pressed into this opening (e.g., cover unit) with force. This tight fit generates a high frictional force due to the elastic deformation of the materials involved, which holds the components securely and stably together.Press fits can be achieved through various processes such as cold pressing, hot pressing, or shrinking. This type of connection is particularly advantageous because it requires no additional fasteners such as screws or adhesives and ensures high mechanical strength as well as precise alignment of the components. Typical applications include securing shafts in bearings, gears to shafts, or similar mechanical components where a reliable and durable connection is required. The term "fastener" can refer to a component or device that connects two or more components by generating frictional forces. A typical example of a friction-fit fastener is an O-ring.An O-ring element is a ring-shaped sealing element, particularly made of elastomeric material, which is inserted into a groove or channel between two components to be joined, especially the carrier unit and the cover unit. During assembly, the O-ring element can be deformed by the contact pressure of the joined parts, creating a high frictional force that prevents movement of the parts relative to each other and ensures a tight seal. This frictional force can be generated by the elastic deformation of the O-ring element and, in particular, constitutes a force-fit connection. The O-ring element thus provides not only a reliable seal against liquids or gases but also a stable mechanical connection (R. 417497).

[0033] - 8 - of the components. The selection of the appropriate O-ring material and dimensions depends on the specific operating conditions, including the type of medium to be sealed, the temperature, the pressure, and the chemical resistance. In certain circumstances, the use of an O-ring element may be advantageous. The O-ring element can be arranged directly on or in a groove on the working unit, the support unit, and / or the cover unit.

[0034] Flexible positioning and secure attachment of the cover unit to the working unit allow for both dynamic adjustment (movement along and around the axis of rotation) and a stable hold (press fit or positive locking connection) depending on the application. The overlapping design provides additional protection.

[0035] It may be advantageous for the drilling device to have a stop element, particularly an axial one, to limit the movement of the cover unit, especially along the axis of rotation and / or in the direction of the working unit. The stop element can be arranged on the working unit. The stop element can be designed as a stop surface. The stop element can be essentially annular. The stop element can be arranged opposite the cover unit. The stop element can extend along, particularly parallel to, a radial plane of the axis of rotation. The stop element is planar. Defined and reproducible positioning of the cover unit along the axis of rotation by means of the axial limitation provided by the stop element.This prevents the cover unit from being overrun and ensures a constant distance to the workpiece, thus increasing process reliability and the functionality of the drilling device. The various designs of the stop element (ring-shaped, flat, parallel to the radial plane) allow for easy integration into the drilling device. Reproducible positioning of the cover unit and protection of the workpiece are ensured. The axial stop element limits the movement of the cover unit along the axis of rotation, prevents it from being overrun, and guarantees a defined distance to the workpiece. This increases process reliability and complies with R. 417497.

[0036] - 9 - protects against collisions. The flexible designs of the stop element allow for easy integration into the drilling device.

[0037] It may be advantageous for the drilling device to have a bearing element for supporting the cover unit. The bearing element is arranged on the working unit. The bearing element extends around the axis of rotation on a circumferential area. The bearing element is curved around the axis of rotation. The bearing element is designed as a bearing surface. The bearing element may be limited along the axis of rotation by the stop element. The bearing element may be limited along the axis of rotation, particularly in sections, by the support element. The bearing element may be arranged on a side of the working unit facing away from the working tip. Stable and defined positioning of the cover unit on the working unit is ensured by the circumferentially arranged, curved bearing element. The axial limitation by the stop and / or support element ensures reproducible positioning and prevents slippage.Placing it away from the working tip protects it from damage and contamination.

[0038] It may be advantageous for the drilling device to have a cutting element, particularly one extending radially relative to the axis of rotation, which limits the radial extent of the working unit. The cutting element may project laterally when viewed perpendicular to the axis of rotation. The cutting element may be formed by one or more cutting edges. The cutting element may form a cutting tip converging towards the axis of rotation. The cutting element may extend from the cutting tip to a circumferential region of the working unit. The working unit may have a further cutting element, particularly one arranged at an angle to the first cutting element. The cutting elements may be angled relative to each other in the circumferential direction. The cutting elements may terminate in the cutting tip. The transport recess may be arranged between the cutting elements in the circumferential direction around the axis of rotation.The transport recess can be spaced radially from the circumferential area. Targeted and controlled material removal is achieved by the radially arranged cutting element, which is R. 417497.

[0039] - 10 - radial extension of the working unit is limited and thus the shaping of the machined material is precisely defined. The additional cutting elements and their arrangement (angled, common cutting tip) enable efficient chip removal through the transport recess and optimize the cutting process.

[0040] It may be advantageous for the drilling device to have a circumferential projection, particularly arranged on the circumference of the working unit, for guiding the working unit. The circumferential projection may have a radius of elevation relative to the axis of rotation, which is greater than the outer radius of the cover unit, particularly its maximum radius. The circumferential projection may form the maximum outer diameter of the working unit. The circumferential projection may have a curved circumferential surface. The circumferential surface may form a type of wear surface. The circumferential projection may support the cutting element when viewed along the axis of rotation. The circumferential projection may begin in front of, and end behind, the cutting element, when viewed around the direction of rotation. The circumferential projection may be spaced apart from another circumferential projection when viewed around the direction of rotation.The transport recess can be positioned circumferentially, around the direction of rotation, between the two circumferential projections. The circumferential projection provides improved guidance and stabilization of the working unit during the drilling process and simultaneously serves as wear protection. Its larger radius compared to the cover unit prevents contact with the workpiece material, thus avoiding abrasion and damage. The strategic positioning of the circumferential projection relative to the cutting elements and transport recesses optimizes chip evacuation and promotes low-friction drilling.

[0041] It may be advantageous for the drilling device to have a circumferential recess, particularly one arranged on the circumference of the working unit, for transporting particles along a circumferential area of ​​the drilling device. The circumferential recess may be oriented towards the axis of rotation, R. 417497

[0042] - 11 - in particular, have a maximum recess radius that is smaller than, in particular, a maximum (outer) radius of the cover unit and / or larger than, in particular, a minimum (inner) radius of the cover unit. The circumferential recess can be arranged between two circumferential protrusions. The circumferential recess can begin in the circumferential direction around the axis of rotation in front of the transport recess and end behind the transport recess. The circumferential recess can have a circumferential recess surface. Efficient removal of drilling particles and dust through the circumferential recess, which serves as a transport channel. The positioning and dimensioning of the recess between circumferential protrusions and in relation to the transport recess ensures directed conveyance of the particles from the drilling area, thereby preventing contamination of the drilling device and impairment of the drilling process.At the same time, the dimensioning in relation to the cover unit ensures trouble-free movement of the cover unit.

[0043] It may be advantageous for the transport unit to have a transport recess, particularly designed as a transport channel, for transporting particles. The transport recess may be arranged in the working unit. The transport recess may extend along the axis of rotation from one end of the carrier unit to an end of the carrier unit opposite the end. The transport recess may be circumferentially surrounded around the axis of rotation, particularly completely, by the working unit. The transport recess may be embedded in the working unit. The transport recess may extend, particularly in a straight line, through the entire working unit. The transport recess may be surrounded by the bearing element. The transport recess may have an inlet opening, particularly at one end (end face). The transport recess may have an outlet opening, particularly at a further end opposite the end.Continuous and reliable removal of drilling particles through the continuous transport recess, which extends over the entire length of the working unit. The embedded arrangement and comprehensive design minimize the likelihood of clogging and facilitate cleaning. Defined inlet and outlet openings enable targeted particle guidance and disposal. R. 417497.

[0044] - 12 -

[0045] It may be advantageous for the transport unit to have a further transport recess for transporting particles, in particular designed as a further transport channel. The further transport recess may be arranged in and / or formed by the carrier unit. The further transport recess may be arranged transversely, in particular perpendicularly, to the axis of rotation, between the carrier unit and the cover unit, and / or be formed by them. The further transport recess may extend along the axis of rotation from one end of the carrier unit to the opposite end. The further transport recess may be circumferentially surrounded around the axis of rotation, in particular completely, by the cover unit. The further transport recess may be embedded in the carrier unit. The further transport recess may extend, in particular spirally and / or helically, along the entire carrier unit.The further transport recess can have an inlet opening, particularly at one end. The further transport recess can have an outlet opening, particularly at a further end facing away from the end. Drilling device according to one of the preceding claims, characterized in that the transport recess, viewed along the axis of rotation, opens into the further transport recess, the further transport recess being larger than the transport recess in a radial plane. The transport recess can connect to the further transport recess. The transport recess and the further transport recess can be spaced apart and / or arranged parallel to the axis of rotation. Improved chip removal through a two-stage transport system.The additional transport recess between the carrier unit and the cover unit allows for the temporary storage and targeted removal of drilling particles before they enter the main transport recess. This reduces the load on the main transport recess and increases the efficiency of chip removal, especially with high drilling volumes. The spiral or helical design of the additional transport recess facilitates particle transport and prevents blockages. R. 417497.

[0046] - 13 -

[0047] Brief description of the drawings

[0048] Further advantages arise from the following description of the drawings. The drawings may depict further developments of the invention. The drawings, the description, and the claims contain numerous features in combination. The person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations. This shows:

[0049] Fig. 1 shows a schematic view of a system consisting of a

[0050] hand-held power tool, a drilling device, an adapter device and a suction device,

[0051] Fig. 2 a perspective view of a device according to the invention

[0052] Drilling device,

[0053] Fig. 3 shows a section through the drilling device from Fig. 2 and

[0054] Fig. 4, Fig. 5 further perspective views of a part of the drilling device from Fig. 2.

[0055] In the following figures, identical components are labelled with the same reference symbols.

[0056] Figure 1 shows a hand-held power tool 300 designed as a rotary hammer 300, with a tool holder 302 and a drill bit 1, designed as a rock drill bit 1, arranged on the tool holder 302. The drill bit 1 is shown in a drilling state in which it is positioned in an opening of a workpiece 2. A vacuum cleaner 400, designed as a construction site vacuum cleaner 400, is provided for the extraction of dust particles. The vacuum cleaner 400 is fluidically connected to a suction device 12 arranged on the drill bit 1, which completely surrounds the drill bit 1. The suction device 12 surrounds the drill bit 1 and movably mounts the drill bit 1 about a rotational axis R of the drill bit 1. The vacuum cleaner 400 and the suction device 12 are connected by means of a suction hose 402. The suction hose 402 enables a suction flow, shown with arrows, from the side of the drilling tool 1 towards the suction machine 400.R. 417497.

[0057] - 14 -

[0058] The drilling device 1 from Fig. 2 is designed as a rock drilling device for processing workpieces 2 such as brick or concrete.

[0059] For machining a workpiece, a drill head element 3 is provided, which is supported by a shaft element 4 arranged along the axis of rotation 9. A transport recess 5 serves for particle extraction, and a sleeve element 6 is provided to cover the shaft element 4, overlapping the drill head element 3 and the shaft element 4.

[0060] The sleeve element 6 seals the space between the sleeve element 6 and the drill head element 3 or the shaft element 4 in order to prevent or reduce the formation of an exhaust airflow 7 through this gap.

[0061] During operation, the drilling device 1 penetrates the workpiece in the feed direction 8, whereby the feed direction 8 coincides with the axis of rotation 9 of the drilling device 1 and is aligned from the shaft element 4 to the drill head element 3.

[0062] The drilling tool is designed for cutting and / or thrusting movements. In cutting movements, a cutting element 10 rotates about the longitudinal axis; in thrusting movements, a thrusting element 11 moves along the longitudinal axis. Both elements are integrated into the drill head element 3 and form a drilling element 12 for drilling workpieces. The drill head element 3 machines the workpiece, while the shank element 4 holds the drill head element 3 and positions it on a hand-held power tool 13. The drill head element 3 is located at the first end of the drilling device 1, and the shank element 4 is located at the second end. The shank element 4 extends along the axis of rotation 9.

[0063] The drill head element 3 is made of a different material than the shank element 4, preferably of hard metal such as tungsten carbide, titanium carbide or titanium nitride. R. 417497

[0064] - 15 -

[0065] The shaft element 4 is elongated and rod-shaped and is designed for mounting in a rotary hammer machine. At the end opposite the drill head element 3 is a mounting unit 14 (not shown) for coupling with a hand-held power tool 400. The drilling device 1 can be coupled to a tool holder and has a positive locking element 15 for an SDS-plus or SDS-max interface. The shaft element 4 and the mounting unit 14 are formed as a single piece.

[0066] The drill head element 3 and the shaft element 4 have nearly identical connection areas 16, which are joined by a material bond, preferably by welding or brazing. Connection area 16a is assigned to the drill head element 3 and connection area 16b is assigned to the shaft element 4.

[0067] The transport recess 5 enables the extraction of particles along the drilling device 1 and extends through the drill head element 3 and the shaft element 4 parallel to the axis of rotation 9. It has a transport surface 17 with angled and parallel sections that ensure reliable extraction.

[0068] The transport recess 5 is completely surrounded by drill head element 3, shaft element 4 and sleeve element 6 and is divided into two transport recesses 5, namely an inner transport recess 5a bounded by the drill head element 3 and an outer transport recess 5b bounded by the shaft element 4 and the sleeve element 6.

[0069] The sleeve element 6 extends from the shaft element 4 over and overlaps the drill head element 3. It has a larger inner diameter than the shaft element 4 and a maximum outer diameter that is partially larger than that of the drill head element 3. The sleeve element 6 is hollow cylindrical and tubular and extends along the axis of rotation 9 between the drill head element 3 and the shaft element 4. It is arranged coaxially with both elements. R. 417497

[0070] - 16 -

[0071] The sleeve element 6, not shown in detail, is movably mounted and / or connected by means of an interference fit or a positive-locking connecting element. An interference fit is created by pressing a slightly larger component into a receiving opening, whereby a high frictional force securely holds the components together.

[0072] An axial stop element 18 limits the movement of the sleeve element 6 along the axis of rotation 9 and ensures a constant distance to the drill head element 3, thus increasing process reliability. The stop element 18 is annular and arranged parallel to the radial plane of the axis of rotation 9.

[0073] A bearing element 19 for supporting the sleeve element 6 is arranged on the drill head element 3 and extends around the axis of rotation 9. It is limited by the stop element 18 and the support element.

[0074] A cutting element 10 arranged radially opposite the axis of rotation 9 limits the radial extension of the drill head element 3 and enables precise material removal. Further cutting elements 10 are angled and terminate in a cutting tip, which enables efficient chip removal through the transport recess 5.

[0075] A circumferential projection 20 on the drill head element 3 serves to guide and support the cutting element 10. It has a larger projection radius than the outer diameter of the sleeve element 6 and forms the maximum outer diameter of the drill head element 3.

[0076] A circumferential recess 21 on the drill head element 3 serves to transport particles along the drilling device 1 and has a smaller recess radius than the outer diameter of the sleeve element 6.

[0077] The transport recess 5a extends in a straight line along the axis of rotation 9 and is completely surrounded in one plane by the drill head element 3. The transport recess 5a has an inlet opening 22 and an outlet opening 23. R. 417497

[0078] - 17 -

[0079] The further transport recess 5b in the shaft element 4 extends section by section transversely to the axis of rotation 9 between shaft element 4 and sleeve element 6 and is spirally or helically shaped. The further transport recess 5b also has an inlet opening, which essentially corresponds to the outlet opening 23 of the transport recess 5a, and an outlet opening not shown in detail. Viewed along the axis of rotation, the transport recess 5a opens into the further transport recess 5b, which is larger than the transport recess 5a in a radial plane. This enables improved chip removal by means of a two-stage transport system.

Claims

R. 417497 - 18 - Claims 1. Drilling device, in particular rock drilling device, comprising a working unit (3) for processing a workpiece, a support unit (4) for carrying the working unit (3), in particular arranged along an axis of rotation (9), a transport unit (5) for transporting particles and a cover unit (6) for covering the support unit (4), characterized in that the cover unit (6) covers / overlaps the working unit (3) and the support unit (4) when viewed along the axis of rotation (9).

2. Drilling device according to claim 1, characterized in that the cover unit (6) has an (inner) diameter which is larger than an (outer) diameter of the support unit (4) and / or which, in particular in sections, is larger than an (outer) diameter of the working unit (3).

3. Drilling device according to one of the preceding claims, characterized in that the cover unit (6) is essentially hollow cylindrical, wherein the cover unit (6) has a wall thickness which is greater than 0.5 mm and / or less than 2 mm.

4. Drilling device according to one of the preceding claims, characterized in that the cover unit (6) is movably mounted relative to the working unit (3) along the axis of rotation (9) and about the axis of rotation (9), in particular in an overlapping state, and / or is connected by means of a press fit and / or is connected by means of a connecting element, in particular in a form-fitting manner.

5. Drilling device according to one of the preceding claims, characterized by a, in particular axial, stop element (18) to limit a movement of the cover unit (6), in particular along the axis of rotation (9) and / or in the direction of the working unit (3) R. 417497 - 19 - pointing, wherein the stop element (18) is arranged on the working unit (3) and is essentially ring-shaped.

6. Drilling device according to one of the preceding claims, characterized by a bearing element (19) for supporting the cover unit (6), wherein the bearing element (19) is arranged on the working unit (3) and extends in a curved circumferential area around the axis of rotation (9).

7. Drilling device according to one of the preceding claims, characterized by a cutting element (10), in particular extending radially relative to the axis of rotation (9), which limits a radial extension of the working unit (3), wherein the cutting element (10) projects laterally when viewed perpendicular to the axis of rotation (9).

8. Drilling device according to one of the preceding claims, characterized by a circumferential elevation (20) arranged in particular on the circumferential area of ​​the working unit (3) for guiding the working unit (3), wherein the circumferential elevation (20) has a, in particular maximum, elevation radius to the axis of rotation (9) which is larger than a, in particular maximum, (outer) radius of the cover unit (6).

9. Drilling device according to one of the preceding claims, characterized by a circumferential recess (21) arranged, in particular on the circumferential region of the working unit (3), for the transport of particles along a circumferential region of the drilling device, wherein the circumferential recess (21) has a, in particular maximum, recess radius relative to the axis of rotation (9), which is smaller than a, in particular maximum, (outer) radius of the cover unit (6) and larger than a, in particular minimum, (inner) radius of the cover unit (6).

10. Drilling device according to one of the preceding claims, characterized in that the transport unit (5) has a transport recess (5), in particular designed as a transport channel, for transporting R. 417497 - 20 - has particles, wherein the transport recess (5a) extends straight through the working unit (3) along the axis of rotation (9).

11. Drilling device according to one of the preceding claims, characterized in that the transport unit (5) has a further transport recess (24), in particular designed as a further transport channel, for transporting particles and / or the further transport recess (5b) is arranged transversely, in particular perpendicularly, to the axis of rotation (9) between the carrier unit (4) and the cover unit (6) and is formed by them and / or the further transport recess (5b) extends, in particular in a spiral and / or helical manner, along the carrier unit (4).

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