Bohrstock

Abstract

The invention relates to a drill rod (100) with a drill tube (110) for receiving a sample and with a rod (120) that is displaceable within the drill tube (110) for pushing out the sample. The invention is characterized in that the rod (120) is designed as a telescopic rod (120) that is axially displaceable by means of a guide profile (124) in a guide piece (114) arranged on the drill tube (110). This has the advantage that the telescopic rod (120) always remains within the drill tube (110) during drilling and sample removal and has a dual function, firstly as a telescopic extension during the drilling process and secondly as an pushing-out rod for the sample.

Description

TECHNICAL FIELD

[0001] The present invention relates to a drill rod, particularly for taking samples from a silo. However, the drill rod is also suitable for taking other samples, such as soil samples, particularly from former moorland areas. STATE OF THE ART

[0002] A drill rod known from DE 20 2018 005 708 U1 has a drill pipe tapered at the bottom for receiving a sample from a silo. A rod that can be moved inside the drill pipe to eject the sample must be inserted from the lower end of the drill pipe after removing an adapter from the upper end. Handling the drill pipe for sampling is therefore cumbersome and time-consuming.

[0003] Based on this prior art, it is the object of the present invention to provide a drill rod that is easier to handle. DISCLOSURE OF THE INVENTION

[0004] The object is achieved with a drill rod according to claim 1. Further developments of the invention are the subject of the dependent claims.

[0005] According to the invention, a drill rod is characterized in that the movable rod for pushing out the sample is designed as a telescopic rod, which is axially movable with a guide profile in a guide piece arranged on the drill pipe. This has the great advantage that the telescopic rod always remains in the drill pipe during drilling and sample removal, serving a dual function: firstly, as a telescopic extension during the drilling process and secondly, as a push-out rod for the sample.

[0006] Preferably, the guide profile and the guide piece are connected or connectable to each other in a rotationally fixed manner. In particular, the guide piece can be designed as a polygonal profile and the guide profile as a complementary guide profile.

[0007] In a preferred embodiment of the present invention, the telescopic rod has an ejector at its lower end, which is adapted to the inner diameter of the drill pipe. In particular, the ejector is adapted to the inner diameter of the drill pipe in such a way that the ejector acts like a tightly guided piston. With the ejector acting as a piston, the sample obtained during drilling can be completely ejected from the drill pipe after the drilling process has been completed and the drill rod has been withdrawn. In particular, the telescopic rod is designed to be at least as long as the drill pipe, preferably longer than the drill pipe.

[0008] The guide piece advantageously limits the sliding movement of the telescopic rod in the drill pipe with its lower end. The guide piece can preferably be designed as a stop for the ejector. For example, the outer diameter of the ejector can be larger than the inner diameter of the guide piece.

[0009] Particularly preferably, the drill pipe is provided with an external thread at least near a lower end, which makes screwing into the material from which the sample is to be taken considerably easier.

[0010] A reduction in the force required during the drilling process is also advantageously achieved by providing the drill pipe with a cutting edge at its lower end. This can, for example, simply be formed as a bevel ground from the outside at the lower end of the drill pipe.

[0011] According to a further advantageous embodiment of the invention, the telescopic rod is provided at its upper end with an adapter for coupling to a further extension, in particular an extension rod, or with a connecting piece. This adapter, with its lower end, advantageously simultaneously limits the sliding movement of the telescopic rod into the drill pipe.

[0012] Particularly preferably, the sliding movement of the telescopic rod can be limited on one side by the adapter and on the other side by the ejector.

[0013] The connecting piece can be detachably connected to the adapter using coupling elements. Coupling elements can be, for example, a spring-loaded pin and a matching hole. Such coupling elements are familiar, for example, from connecting tent poles. If the extension or extension rod is also equipped with an adapter at its upper end, the drill rod can also be used for greater drilling depths by connecting several extensions together.

[0014] It is also advantageous if the connector has a tool attachment for coupling to the chuck of a drill. Using a drill, the drill bit can be easily rotated into the material in a clockwise direction, for example, and easily withdrawn from it in a counterclockwise direction. Instead of a drill, the connector can also be equipped with or connected to a longer crossbar for manual operation, allowing the drill bit to be screwed into the material manually. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Further features, advantages, and embodiments of the invention will become apparent from the following description of embodiments of a drill rod with reference to the figure. It shows: Fig. 1 a perspective, partially broken away view of a first embodiment of a drill rod. EMBODIMENTS OF THE INVENTION

[0016] Fig. 1 shows a drill rod 100 which is formed by a drill pipe 110, a rod designed as a telescopic rod 120 which is slidably guided in the drill pipe 110, an adapter 130 at the upper end of the telescopic rod 120 and a connecting piece 140 which can be connected to the adapter 130.

[0017] The drill pipe 110 is designed as a hollow cylindrical tube. A cutting edge 113—particularly in the form of an externally ground bevel—is provided at the lower end 111 of the drill pipe 110. This edge facilitates the penetration of the drill pipe 110, for example, through a tarpaulin covering a silo from which a sample is to be taken. The cutting edge 113 also facilitates the drilling process overall, especially with fibrous material.

[0018] In the lower part, the drill pipe 110 is provided with an external thread 116, which can be applied, for example, by welding to the outer surface of the drill pipe 110.

[0019] Near its upper end 112, the drill pipe 110 has a guide piece 114 inside which is connected to the drill pipe 110 in a rotationally fixed manner and which, in the embodiment shown, is designed as a square pipe.

[0020] The telescopic rod 120 is guided longitudinally displaceably inside the drill pipe 110. Guidance is provided, on the one hand, by a guide profile 124 on the outside of the telescopic rod 120, which in the illustrated embodiment has a square cross-section, and, on the other hand, by a cylindrically shaped ejector 123 arranged at the lower end 121 of the telescopic rod 120. The guide profile 124 is adapted to the guide piece 114 in such a way that it can be easily displaced axially therein. Likewise, the ejector 123, with its outer diameter, is adapted to the inner diameter of the drill pipe 110 in such a way that it can be easily displaced axially therein. The ejector 123, with its upper end in cooperation with the lower end of the guide piece 114, simultaneously forms a limit to the upward axial displacement of the telescopic rod 120.

[0021] At its upper end 122, the telescopic rod 120 is connected to an adapter 130. In the illustrated embodiment, the adapter 130 is designed as a short square tube, the lower end 131 of which, in conjunction with the upper end 112 of the drill pipe 110, simultaneously forms a stop and thus a limit for the downward displacement of the telescopic rod 120.

[0022] During assembly of the drill rod 100, the telescopic rod 120 is inserted into the drill pipe 110 from the lower end 111 until the upper end 122 of the telescopic rod 120 protrudes beyond the upper end 112 of the drill pipe 110. The adapter 130 is then detachably or permanently connected to the upper end 122 of the telescopic rod 120. The length of the telescopic rod 120 is matched to the length of the drill pipe 110 such that the lower end of the ejector 123 approximately reaches the lower end 111 of the drill pipe 110 when the lower end 131 of the adapter 130 abuts the upper end 112 of the drill pipe 110.

[0023] The adapter 130 has, for example, a coupling bore 133 as a coupling element, which interacts with a spring-mounted coupling pin 143 formed as a further coupling element on the connecting piece 140. The connecting piece 140 has, in its lower part, in which the coupling pin 143 is also arranged on one of the outer surfaces, a connecting profile 141, which in the illustrated embodiment is designed as a square rod or square tube. The connecting profile 141 is adapted to the inner diameter of the adapter 130 at its upper end 132, so that the connecting profile 141 can be easily inserted into the adapter 130 after the coupling pin 143 has been pressed in. To uncouple, the coupling pin 143 must be pressed back into the coupling bore 133 and, at the same time, the connecting piece 140 must be pulled upwards out of the adapter 130.

[0024] The connecting piece 140 has an outer profile 142, which in the embodiment shown corresponds to the outer profile of the adapter 130, so that the connecting piece 140 and the adapter 130 form an easily graspable unit in the coupled state.

[0025] At the upper end of the connecting piece 140, a tool attachment 144 is arranged, which in the embodiment shown is designed as a hexagon and is thus suitable for being received in a drill chuck of a drill.

[0026] If the drill rod 100 is not to be operated by means of a drill but manually, the adapter 140 can also be provided with a longer crossbar on both sides or a corresponding actuating lever with a hexagon socket can be placed on the tool attachment 144.

[0027] To take a sample from a silo, the drill rod 100 is placed with its cutting edge 113 on top of a silo cover. Depending on the desired depth and thickness of the sample to be taken, the telescopic rod 120 is moved partially or completely upwards within the drill pipe 110. After coupling a drilling machine to the tool attachment 144, the drill is set in clockwise rotation, whereby the guide profile 124 in conjunction with the guide piece 114 transmits the torque to the drill pipe 110, and the drill pipe is screwed into the material via the external thread 116. By canting the guide profile 124 with the guide piece 114 during the transmission of the torque, a slight axial pressure can also be exerted on the drill pipe 110 at the same time, which is entirely sufficient for screwing in the drill pipe 110.

[0028] To remove the sample, the drill is rotated counterclockwise, causing the drill pipe 110 to unscrew from the material. After the drill pipe 110 has been completely withdrawn from the material, its lower end 111 is held over a bucket to collect the sample, and the telescopic rod 120 is moved downward within the drill pipe 110. The ejector 123 then pushes the removed sample material completely downward from the drill pipe 110.

[0029] If borehole samples are to be taken from greater depths, one or more further extensions can be inserted between the adapter 130 and the telescopic rod 120, which can be connected to the adapter 130 in the same way as the connecting piece 140 by means of a square engagement and coupling bore and coupling pin. LIST OF REFERENCE SYMBOLS 100 drill rods 110 drill pipe 111 (lower) end (of 110) 112 (upper) end (of 110) 113 Cutting edge 114 Guide piece 116 external threads 120 rod (telescopic rod) 121 (lower) end (of 120) 122 (upper) end (of 120) 123 ejectors 124 Leadership Profile 130 adapters 131 (lower) end (of 130) 132 (upper) end (of 130) 133 Coupling bore 140 connecting piece 141 connecting profile (to 140) 142 exterior profile (of 140) 143 Coupling pin 144 Tool approach QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2018 005 708 U1

[0002]

Claims

[1] Drill rod (100) with a drill pipe (110) for receiving a sample and with a rod (120) which can be moved in the drill pipe (110) for pushing out the sample, characterized by that the rod (120) is designed as a telescopic rod (120) which is axially displaceable by means of a guide profile (124) in a guide piece (114) arranged on the drill pipe (110). [2] Drill rod (100) according to claim 1, characterized by that the telescopic rod (120) is provided at a lower end with an ejector (123) adapted to the inner diameter of the drill pipe (110). [3] Drill rod (100) according to claim 1 or 2, characterized by that the drill pipe (110) is provided with an external thread (116) at least near a lower end (111). [4] Drill rod (100) according to at least one of the preceding claims, characterized by that the drill pipe (110) is provided with a cutting edge (113) at its lower end (111). [5] Drill rod (100) according to at least one of the preceding claims, characterized by that the telescopic rod (120) is provided at an upper end (122) with an adapter (130) for coupling with a further extension or with a connecting piece (140). [6] Drill rod (100) according to claim 5, characterized by that the adapter (130) with a lower end (131) limits the displacement of the telescopic rod (120) into the drill pipe (110). [7] Drill rod (100) according to claim 5 or 6, characterized by that the connecting piece (140) can be detachably connected to the adapter (130) by means of coupling elements (133; 143). [8] Drill rod (100) according to one of claims 5 to 7, characterized by that the connecting piece (140) has a tool attachment (144) for coupling to a tool chuck of a drilling machine.

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