Method for releasing a screw connection between a core drilling device and a drill bit, and core drilling device

Abstract

A method for releasing a screw connection between a core drilling device and a drill bit, wherein the screw connection is released by application of torque spikes to the drive shaft of the core drilling device, these torque spikes coming into effect when the drive shaft is driven counter to the actual drilling direction of the core drilling device. A core drilling device with which the proposed method can be carried out is also provided. To this end, the core drilling device includes a drive shaft to which torque spikes can be applied, wherein the drive shaft can be driven in a drilling direction and a second direction of rotation which is opposite to the drilling direction. A core drilling device, in which the reversal of a direction of rotation of a drive shaft of the core drilling device and application of torque spikes to the drive shaft are combined with one another such that, as a result of the combination of the reversal of the direction of rotation and torque spikes, a screw connection between the core drilling device and a drill bit can be released.

Claims

1-11. (canceled)

12. A method for releasing a screw connection between a core drilling device and a drill bit, the method comprising: a) providing a core drilling device having a drill bit, the drill bit, during operation of the core drilling device, being fastened to the core drilling device via a screw connection, and having a drive shaft, torque spikes capable of being applied to the drive shaft, wherein, during operation of the core drilling device, the drill bit is driven in a drilling direction via the drive shaft of the core drilling device, b) operating the core drilling device in a second direction of rotation, wherein the second direction of rotation is opposite to the drilling direction, and c) releasing the screw connection between a core drilling device and the drill bit through rotation of the drive shaft in the second direction of rotation.

13. The method as recited in claim 12 wherein the screw connection between the core drilling device and the drill bit is released without a tool.

14. The method as recited in claim 12 wherein the torque spikes release the screw connection between the core drilling device and the drill bit when the drive shaft of the core drilling device is driven in the second direction of rotation.

15. A core drilling device configured to carry out the method as recited in claim 12.

16. The core drilling device as recited in claim 15 wherein the torque spikes are designed to release the screw connection between the core drilling device and the drill bit when the drive shaft of the core drilling device is driven in the second direction of rotation.

17. The core drilling device as recited in claim 15 further comprising comprises a motor for driving the drive shaft, wherein the motor is configured to generate the torque spikes, a strength of the torque spikes being sufficient to effect the releasing of the screw connection between the core drilling device and the drill bit.

18. The core drilling device as recited in claim 15 wherein the motor of the core drilling device is a brushless motor.

19. The core drilling device as recited in claim 15 wherein the core drilling device is a diamond core drilling device, and the drill bit is a diamond drill bit.

20. The method as recited in claim 12 wherein reversal of the direction of rotation of a drive shaft of the core drilling device in step b) is combined with application of the torque spikes to the drive shaft to effect the releasing of the screw connection in step c).

21. The method as recited in claim 12 wherein the drive shaft of the core drilling device is subjected to the torque spikes during operation of the core drilling device in the second direction of rotation to effect the releasing of the screw connection.

22. The method as recited in claim 12 further comprising controlling a motor of the core drilling device with instructions executable by a computer program, the computer program executing the method steps as recited in claim 12.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Further advantages will become apparent from the following description of the figures. The FIGURE, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

[0028] In the FIGURES:

[0029] FIG. 1 shows a view of a preferred configuration of the invention.

DETAILED DESCRIPTION

[0030] FIG. 1 shows a proposed core drilling device 1 with which the proposed method for separating a drill bit 2 from a core drilling device 1 can be carried out. During operation of the core drilling device 1, i.e. when it is used for cutting drill cores out of a substrate, it is connected to a drill bit 2, wherein the drill bit 2 is driven into the substrate in order to cut out the drill core. To this end, the drill bit 2 is made to rotate by a drive shaft 3 of the core drilling device 1, wherein the drive shaft 3 for its part is driven by a motor 5 of the core drilling device 1. Provision is made for the drive shaft 3 or the drill bit 2 to be operated in a drilling direction A during operation of the core drilling device 1, i.e. during a drilling operation. This preferably means, according to the invention, that the drill bit 2 rotates for example in a clockwise direction or is driven in rotation in the clockwise direction when a drill core is intended to be cut out of a substrate. The connection between the core drilling device 1 and the drill bit 2 is formed in particular by a screw connection 6. Possible examples of a first direction of rotation A and a second direction of rotation B are indicated schematically in FIG. 1 by arrows. In the actual realization of the invention, the directions of rotation A, B can of course also be interchanged.

[0031] After work has been carried out and for transporting the core drilling device 1, it may be necessary or desired for the drill bit 2 to be removed from the core drilling device 1. To this end, the present invention provides for the core drilling device 1 to be operated in a second direction of rotation B that is opposite to the drilling direction A. In other words, when the drill bit 2 is intended to be separated from the core drilling device 1, a reversal of the direction of rotation takes place in that the direction of rotation of the core drilling device 1 is changed. This changing of the direction of rotation preferably consists in the direction of rotation of the core drilling device 1 being switched from a first direction of rotation A to a second direction of rotation B. In the exemplary embodiment of the invention that is mentioned in the preceding paragraph, a counterclockwise direction of rotation would correspond to the second direction of rotation B, while a clockwise rotation corresponds to the drilling direction A or first direction of rotation A.

[0032] Furthermore, provision is made for torque spikes 4 (shown solely schematically in FIG. 1) to be applied to the drive shaft 3 of the core drilling device 1, said torque spikes 4 helping to release the screw connection 6 between the core drilling device 1 and drill bit 2. For this purpose, in particular the inertia of the drill bit 2 is exploited. In other words, the drive shaft 3 of the core drilling device 1 can be subjected to torque spikes 4, wherein the torque spikes 6 have such a strength that the drill bit 2 can be released from the core drilling device 1 using them.

LIST OF REFERENCE SIGNS

[0033] 1 Core drilling device [0034] 2 Drill bit [0035] 3 Drive shaft [0036] 4 Torque spikes [0037] 5 Motor of the core drilling device [0038] 6 Screw connection [0039] A Drilling direction [0040] B Second direction of rotation