Anchor drilling and setting device The invention relates to an anchor drilling and setting device including a drill rod, a telescopable supporting device on the 5 roof, a drill motor, and clamping jaws fixed to the supporting device for clamping the drill rod during the attachment of drill rod extensions. Anchor drilling and setting devices of the initially defined 10 kind are used in underground areas and comprise two carriage units which are displaceable one within the other as well as a drill motor. Such anchor drilling and setting devices are formed with a telescopable supporting device, wherein a plate or bar is arranged on the front end to brace the drilling 15 device against the roof and form a support for mounting facing elements and, for instance, so-called W-straps. Such a drill mount is, for instance, illustrated in US-A 6,105,684. In the supporting plate or bar element of such an anchor 20 drilling and setting device, hydraulically displaceable clamping jaws are provided for clamping the drill rod in order to keep the drill rod in its respective position during the insertion of drill rod extensions and prevent the drill rod from falling out of the already produced bore. 25 Particularly when drilling in the roof, the space below the anchor drilling and setting device must be separately protected against drillings falling down. Suitable protection is likewise required during wet-drilling or with the use of flushing fluids 30 during drilling. In this context, British patent No. 773,892 shows and describes a separate device capable of being brought into an appropriate position near the roof via a toothed rod and braced between the roof and the floor. That separate device must be appropriately connected with the drill rod and 35 positioned in correspondence with the respective orientation of the drill rod. Such a device, thus, presupposes an additional structure and a suitable manipulator in order to ensure the 2 respectively correct position, the simple attachment and simple removal of that additional device yet being not readily feasible without cumbersome mounting operations. 5 The invention aims to configure an anchor drilling and setting device of the initially defined kind with a simply structured retrofit component which, without any additional measures on the mount, enables the complete removal of drillings while, at the same time, providing a drill rod guide with easily 10 exchangeable wear parts. To solve this object, the configuration according to the invention, of the anchor drilling and setting device essentially consists in that a cylindrical sealing sleeve is 15 provided, which, on its end side facing the supporting device, carries a sealing element overlapping the edge of the sealing sleeve and, on its end side facing away from the supporting device, carries a sealing element through which the drill rod passes and which seals the cylinder volume of the sealing 20 sleeve in the direction of the axis of the drill rod, and that a channel for the removal of drillings as well as optionally drilling fluid is connected to the jacket of the sealing sleeve between the two sealing elements. By providing a simple cylindrical sealing sleeve which can be sealingly pressed at 25 the supporting device by its end side facing the supporting device or supporting plate, to which end a sealing element overlapping the edge of the sealing sleeve is provided, a simple component to be immediately used without any additional measures is realized, whose fixation is feasible using the 30 already available clamping jaws for clamping the drill rod during the attachment of drill rod extensions. By appropriately sealing the cylinder volume of the sealing sleeve in the direction of the axis of the drill rod and connecting a channel for the removal of drillings and optionally drilling fluid to 35 the jacket of the sealing sleeve between the two sealing elements, the space below the anchor drilling and setting device will be accordingly secured so as to be safely available 3 for further manipulations and maintenance work even during the operation of the anchor drilling and setting device. In a particularly advantageous manner, the configuration 5 according to the invention is devised such that the end of the sealing sleeve facing away from the supporting device carries a double-walled bottom in whose hollow space an annular seal or sealing disc is received, which is axially displaceable between two positions sealingly contacting, or sliding on, the axial 10 passages for the drill rod. Such a configuration comprising a double-walled bottom allows a seal to be held in the thus formed hollow space each in a sealing position on the respective one of the two axial passages provided for the drill rod. In principle, the axially displaceable annular seal or 15 sealing disc used in this case may be held clampingly on the drill rod such that the sealing element, at an axial advance of the drill rod, will be taken along in the direction of the respectively upper one of the two walls of the double-walled bottom and there will sealingly encompass the opening for the 20 drill rod. With an accordingly rigid connection or high frictional engagement between the seal and the drill rod, the annular seal will co-rotate at a rotation of the drill rod and slidingly surround the respective passage. If, on the other hand, the frictional engagement in the axial direction of the 25 drill rod on the drill rod allows for a rotational movement of the annular seal relative to the drill rod by the appropriate configuration of the inner contour of the annular seal, it will merely be feasible to press the sealing element at the edge of the respective passage, with the drill rod being rotationally 30 movable through the sealing element in the axial direction. When retracting the drill rod, the respective other one of the two walls of the double-walled bottom will start to act, wherein it is feasible to design, in particular, the outwardly arranged wall as a pivot bearing for the drill rod in a 35 particularly advantageous manner. In any event, the configuration is advantageously devised such that the annular 4 seal axially displaceable in the double-walled bottom is axially displaceable and sealingly held on the drill rod. In order to enable an accordingly easy exchange of the parts 5 that are exposed to increased wear, such as, for instance, the drill rod duct, the configuration is advantageously devised such that the double-walled bottom is comprised of a bottom fixed at an axial distance from the edge of the sealing sleeve and comprising an axial bore for the drill rod, and a lid fixed 10 to the edge of the sealing sleeve and whose bore is designed as a bearing for the drill rod. This additional lid is, thus, formed as a wear part enabling the mounting of the drill rod, such a lid being simply connectable with the sealing sleeve, for instance by screws, and hence accordingly easily 15 exchangeable. In the main, the sealing sleeve can be held in the respectively desired position by the clamping jaws for clamping the drill rod, and upon release of the sealing sleeve by the clamping jaws can be retracted to such an extent that only the drill rod will be held in a new clamping position of 20 the clamping jaws so as to enable drill rod extensions to be safely realized without any additional expenditures. As already mentioned, the configuration is advantageously devised such that the supporting device is designed as a bar 25 that is pressable against the roof, wherein the clamping jaws fixed to the supporting device are preferably displaceable radially to the axis of the sealing sleeve into a position releasing the sealing sleeve and into a position holding the sealing sleeve in tight contact with the bar. 30 In the following, the invention will be explained in more detail by way of an exemplary embodiment schematically illustrated in the drawing. Therein, Fig. 1 is a schematic side view of a drill mount with an attached sealing sleeve; and Fig. 35 2 is an enlarged sectional illustration of the sealing sleeve.
5 From Fig. 1, a drill rod is apparent, whose drill bit is denoted by 2 and passes through a roof bar 3. The roof bar 3 is braced between the floor 6 and the roof via telescopic props 4 and 5. A drill motor is schematically indicated by 7, the 5 broken line 8 denoting the axis of the respective drill rod to be extended. A sealing element or sealing sleeve, which is illustrated on an enlarged scale in Fig. 2, is schematically denoted by 9. 10 Fig. 2 again depicts the end of the drill rod at 1 and the drill bit at 2. Again appropriately braced against the roof 10 is a plate-shaped roof bar 3 to which clamping jaws schematically indicated by 11 and 12 are fixed in a displaceable manner. The clamping jaws encompass the jacket 13 15 of the cylindrical sealing sleeve 9, whose end facing the roof bar or roof carries an annular seal 14. The end side of the sealing sleeve 9 facing away from the roof bar or roof 10 carries a double-walled bottom whose inner bottom 15 is welded with the inner wall 13 of the sealing sleeve 9 and includes a 20 passage 16 for the passage of the drill rod 1. The second wall of this bottom is formed by a screw-on lid 17 whose annular passage 18 for the drill rod 1 is designed as a drill rod bearing. The lid 17 is connected with a flange 20 of the sealing sleeve 9 by the aid of screws 19. 25 In the chamber of the double-walled bottom formed between the lid 17 and the bottom wall 15, a sealing element 21 is arranged, which is clampingly held on the drill rod 1. When displacing the drill rod in the sense of arrow 22, said sealing 30 element is taken along to the inner wall 15 and there encompasses the passage 16, thus ensuring a tight closure. Drillings and optionally flushing fluid supplied through a central bore 23 can enter the hollow space 24 of the sealing sleeve and be discharged via a channel 25 connected to the 35 jacket 13. Upon retraction of the drill rod 1 in a direction opposite the arrow 22, the sealing element 21 can be taken along into the lower position illustrated in Fig. 2, thus 6 sealing the hollow space 24 relative to the bore 18 of the lid 17, which is designed as a bearing. In principle, the tightness can be safeguarded by appropriately sliding contacts, wherein it is irrelevant whether the sealing element 21 is connected with the drill rod I either slidingly or in a rotationally fast manner, e.g. by the appropriate choice of a positive 5 engagement contour. What is essential is that said sealing element be bidirectionally movable in the axial direction between the two positions in abutment on the inner wall 15 and in abutment on the lid 17, respectively, sealing the hollow space 24 in the direction of the axis of the drill rod I in any of the respective end positions. o All publications mentioned in this specification are herein incorporated by reference. Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is solely for the purpose of providing a context for the present invention. It is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present 5 invention as it existed in Australia or elsewhere before the priority date of each claim of this application. It will be understood that the term "comprise" and any of its derivatives (e.g. comprises, comprising) as used in this specification is to be taken to be inclusive of features to which it refers, and is not meant to exclude the presence of any additional features unless otherwise .0 stated or implied. Although the disclosure has been herein shown and described in what is conceived to be the most practical and preferred embodiment, it is recognised that departures can be made within the scope of the invention, which is not to be limited to the details described herein but is to be accorded the full scope of the appended claims so as to embrace any and all equivalent 25 devices and apparatus.