IP Library › Granted Patent US 10,413,974
Granted Patent B2
US 10,413,974 · App. 14/911,201 · Granted Sep 17, 2019

Intuitive, adaptive drilling function

Inventors: Oliver Koslowski (Puergen, DE); Markus Forstner (Landsberg, DE); Egon Koenigbauer (Eichendorf, DE); Michael Fuchs (Bad Woerishofen, DE); Stefan Groer (Graben, DE)
Assignee: Hilti Aktiengesellschaft
B23B35/00B23B45/02B23B51/0406B25F5/00B28D1/041B28D7/005B23B2226/75B23B2260/128
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Quick Facts
Patent No.
US 10,413,974
App. No.
14/911,201
Granted
Sep 17, 2019
Kind
B2
Abstract

A method to control a power tool ( 1 ), especially a handheld core drilling machine, includes a drive ( 10 ) to drive a tool ( 30 ) and a control unit ( 40 ) for when a workpiece (W) is being processed. The method encompasses the following method steps: setting the rotational speed of the drive at a first value; measuring a first power consumption value for the drive; setting a threshold value for the power consumption of the drive; and increasing the rotational speed of the drive to a second value if the power consumption of the drive ( 10 ) exceeds the threshold value due to an increase in the drive load. The power tool includes a drive ( 10 ) to drive a tool ( 3 ) and a control unit ( 40 ) to control at least the rotational speed of the drive.

Claims (54)

1. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load;

wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value; wherein the first value corresponds to a spot-drilling rotational speed and the second value corresponds to a core drilling procedure rotational speed.

2. The method as recited in claim 1 wherein the drive load is increased by raising a contact force onto the tool.

3. The method as recited in claim 1 wherein the threshold value is defined as a function of at least one parameter of the power tool.

4. The method as recited in claim 1 wherein the power tool is a handheld core drilling machine.

5. A power tool performing the method as recited in claim 1 , comprising:

the drive to drive the tool; and

the control unit to control at least the rotational speed of the drive.

6. The method as recited in claim 1 wherein the first power consumption value of the drive is measured as a function of a temperature of the power tool.

7. The method as recited in claim 1 wherein the first power consumption value of the drive is measured as a function of an age or state of wear of the power tool.

8. The method as recited in claim 1 wherein the first power consumption value of the drive is measured as a function of a size of a drill bit of the tool.

9. The method as recited in claim 1 wherein the first power consumption value of the drive is measured as a function of a size of a type of material of the workpiece.

10. The method as recited in claim 1 wherein the first power consumption value of the drive is stored in the control unit.

11. The method as recited in claim 1 wherein as the magnitude of the threshold value increases, the period of time during which the threshold value has to be exceeded for the rotational speed of the drive to be increased to the second value also increases.

12. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load; wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value;

wherein the first power consumption value of the drive is measured as a function of a temperature of the power tool.

13. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load; wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value;

wherein the first power consumption value of the drive is measured as a function of an age or state of wear of the power tool.

14. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load; wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value;

wherein the first power consumption value of the drive is measured as a function of a size of a drill bit of the tool.

15. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load; wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value;

wherein the first power consumption value of the drive is measured as a function of a size of a type of material of the workpiece.

16. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load; wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value;

wherein the first power consumption value of the drive is stored in the control unit.

17. A method to control a power tool having a drive to drive a tool and having a control unit for when a workpiece is being processed, the method comprising the following steps:

setting a rotational speed of the drive at a first value;

measuring a first power consumption value for the drive;

setting a threshold value for power consumption of the drive; and

increasing the rotational speed of the drive to a second value if the first power consumption value of the drive exceeds the threshold value due to an increase in the drive load; wherein the rotational speed of the drive is increased to the second value as a function of the period of time during which the threshold value was exceeded and as a function of the magnitude of the threshold value;

wherein as the magnitude of the threshold value increases, the period of time during which the threshold value has to be exceeded for the rotational speed of the drive to be increased to the second value also increases.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 1, 2016
From: FORSTNER, MARKUS; KOSLOWSKI, OLIVER; KOENIGBAUER, EGON; GROER, STEFAN; FUCHS, MICHAEL
To: HILTI AKTIENGESELLSCHAFT
Reel/Frame 037865/0646 →
Priority Claims (1)
EP 13179827 · Aug 9, 2013 · regional
Continuity (1)
Related Publication 20160200000A1 · Jul 14, 2016
Cited By (3)
US 1,089,340 US 12,208,456 US 12,445,081