Reversing mode for core drilling systems

Patent metadata

Field	Value
Publication number	US-10583499-B2
Application number	US-201615569354-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Apr 28, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A control method for the use of a core drilling system including a core drill and a feed device for driving the core drill along a machine holding device. The method includes the steps of determining the end of a core drilling operation on the basis of reaching a predetermined threshold value for at least one corresponding predefined drilling parameter; and of selecting a reversing mode for retracting a drilling tool out of a borehole at a reversing rotational speed which corresponds to a multiple of a predetermined tapping rotational speed of the drilling tool at the beginning of the core drilling operation.

First claim

What is claimed is:

1. A control method for the use of a core drilling system including a core drill and a feed device for driving the core drill along a machine holding device, the method comprising the following steps:
determining an end of a core drilling operation as a function of reaching a predetermined threshold value for at least one corresponding predetermined drilling parameter; and
selecting a reversing mode for retracting a drilling tool out of a borehole at a reversing rotational speed corresponding to a multiple of a predetermined tapping rotational speed of the drilling tool at a beginning of the core drilling operation.

2. The method as recited in claim 1 wherein the reversing rotational speed corresponds to a multiple of the tapping rotational speed.

3. The method as recited in claim 1 wherein the reversing rotational speed corresponds to a 3-fold to 4-fold multiple of the tapping rotational speed.

4. The method as recited in claim 1 wherein the reversing rotational speed corresponds to one-half the value of an idle rotational speed.

5. The method as recited in claim 1 wherein the tapping rotational speed is dependent on a diameter of the drilling tool used.

6. The method as recited in claim 1 wherein the drilling parameter corresponds to a rotational speed value of a drive of the core drill, a torque value which the drive generates and transmits to the drilling tool, or an amperage value of the drive.

7. The method as recited in claim 1 wherein the predetermined threshold value corresponds to a predetermined percentage of the corresponding drilling parameter.

8. A feed device for driving a core drill along a machine holding device according to the method as recited in claim 1 .

9. A core drill for performing the method as recited in claim 1 .

10. A core drilling system comprising a core drill and a feed device for driving the core drill along a machine holding device for performing the method as recited in claim 1 .

11. The method as recited in claim 1 wherein the core drilling operation drills concrete.

12. The method as recited in claim 1 wherein the core drilling operation drills brickwork.

13. The method as recited in claim 1 wherein the core drilling operation leaves material in the interior of the core drill.

14. The method as recited in claim 13 wherein the material is removed together with the core drill.

15. The method as recited in claim 1 wherein the core drilling operation creates a cylindrical ring.

Assignees

• Hilti Ag

Inventors

• Drexl Tobias
• Hartig Andreas
• Schmalholz Thomas
• Link Bernhard
• Golubovic Goran

Classifications

• B23B2226/75

  Stone, rock or concrete · CPC title

• E21B44/00

  Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions · CPC title

• B28D7/00

  Accessories specially adapted for use with machines or devices of the preceding groups {(B28D5/0058 takes precedence)} · CPC title

• B23B2270/32

  Use of electronics · CPC title

• B23B2270/486

  Measurement of rotational speed · CPC title