METHOD FOR RELEASING AND TIGHTENING A SCREW CONNECTION BETWEEN A CORE DRILLING DEVICE AND A CORE BIT, AND CORE DRILLING DEVICE

Abstract

A method for tightening or releasing a screw connection between a core drilling device and a core bit, the core drilling device including a core bit and a motor, the core bit being able to be caused to move in a first direction of rotation while, by activation of the motor during the tool change, a counter-torque is generated in order to tighten or release the twist lock between the core drilling device and the core bit. A core drilling device for carrying out the method. By activation of the motor of the core drilling device, the motor can be caused to operate counter to the movement of the core bit in the first direction of rotation. As a result, a difference between the torque in the first direction of rotation and the counter-torque can be significantly increased by activation of the motor.

Claims

1-10. (canceled)

11. A method for releasing or tightening a screw connection between a core drill and a core bit, the method comprising the following steps: a) providing a core drilling device having a core bit, the core bit being fastened to the core drill via a screw connection during operation of the core drilling device, and the core drill having a motor configured to generate a torque for driving the core bit; and b) moving the core bit in a first direction of rotation, while a counter-torque is generated when the motor is activated, in order to tighten or release the screw connection between the core drilling device and the core bit.

12. The method as recited in claim 11 wherein the activation of the motor causes the motor to operate counter to the movement of the core bit in the first direction of rotation.

13. The method as recited in claim 11 wherein the activation of the motor of the core drill includes a speed control, with a target speed for the motor being 0 revolutions per minute.

14. The method as recited in claim 11 wherein a difference between the torque in the first direction of rotation and the counter-torque is increased by activating the motor.

15. The method as recited in claim 11 wherein only one additional tool is required for tightening or releasing the screw connection between the core drilling device and the core bit.

16. A core drilling device configured to carry out the method as recited in claim 11.

17. The core drilling device recited in claim 16, the core drilling device comprising the core bit and the motor, the motor configured to generate a torque for driving the core bit such that the core bit is caused to move in the first direction of rotation, while the countertorque can be generated by activation of the motor in order to tighten or release the screw connection between the core drill and the core bit.

18. The core drilling device as recited in claim 16 wherein the motor is activatable in such a way that the motor operates counter to the movement of the core bit in the first direction of rotation.

19. The core drilling device as recited in claim 16 wherein the motor is activatable in such a way that a target speed for the motor is 0 revolutions per minute.

20. The core drilling device as recited in claim 16 wherein the motor is activatable in such a way that a difference between the torque in the first direction of rotation and the counter-torque is increased.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 sensible further combinations.

[0026] In the figures:

[0027] FIG. 1 shows a view of a preferred configuration of the invention

DETAILED DESCRIPTION

[0028] FIG. 1 shows a core drilling device 1 with which the method for connecting or separating a core bit 2 to or from a core drilling device 1 can be carried out. The connection between the core drilling device 1 and the core bit 2 is formed in particular by a screw connection 6. 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 core bit 2, wherein the core bit 2 is driven into the substrate in order to cut out the drill core. For this purpose, the core bit 2 is caused to carry out a rotational movement by a motor 5 of the core drilling device 1. Provision is made for the core bit 2 to be rotated in a first direction of rotation A during the tool change, in order to release the core bit 2 from the core drilling device 1. In addition, the rotational movement of the motor 5 of the core drilling device 1 can also be used to tighten the screw connection between the core bit 2 and the core drilling device 1, i.e. to connect the core bit 2 to the core drilling device 1. In the context of the invention, this preferably means that the core bit 2 rotates, for example, in a clockwise direction. During the tool change, the motor 5 of the core drilling device 1 is activated, with the activation of the motor 5 generating a counter-torque, the counter-torque being oriented in a second direction of rotation B or pointing in a second direction of rotation B. 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.

[0029] After work has been carried out and for transporting the core drilling device 1, it may be necessary or desired for the core bit 2 to be removed from the core drilling device 1. For this purpose, the present invention makes provision for the motor 5 of the core drilling device 1 to be blocked by a targeted activation with a target speed of 0 rpm. Through the targeted activation of the motor 5 of the core drilling device 2, a difference between the torque, which points, for example, in the first direction of rotation A, and the counter-torque, which points, for example, in the second direction of rotation B, can be increased such that a separation of the core bit 2 from the core drilling device 1 can be made considerably easier.

LIST OF REFERENCE SIGNS

[0030] 1 Core drilling device [0031] 2 Core bit [0032] 5 Motor of the core drilling device [0033] 6 Screw connection [0034] A First direction of rotation of the core bit when changing tools [0035] B Second direction of rotation of the counter-torque [0036] T Wrench