Control method for a hand-held power tool

Patent metadata

Field	Value
Publication number	US-10675747-B2
Application number	US-201515528280-A
Country	US
Kind code	B2
Filing date	Nov 17, 2015
Priority date	Nov 20, 2014
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A control method is provided for a hand-held power tool (1), which includes a motor (5) for rotationally driving a tool holder (2) about a working axis (12), including the following steps: detecting a rotary motion of the hand-held power tool (1) about the working axis (12); detecting a rotary or pivoting motion about a transverse axis (18) extending transversely to the working axis (12); triggering a safety function for reducing the torque output of the motor (5) when the rotary motion about the working axis (12) exceeds a limiting value, and suppressing the safety function when the rotary or pivoting motion about the transverse axis (18) is greater than a threshold value.

First claim

What is claimed is:

1. A control method for a hand-held power tool, the hand-held power tool having a motor for rotationally driving a tool holder about a working axis, the control method comprising:
detecting a rotary motion of the hand-held power tool about the working axis;
detecting a further rotary or pivoting motion about a transverse axis extending transversely to the working axis;
triggering a safety function for reducing the torque output of the motor when the rotary motion about the working axis exceeds a limiting value, and suppressing the safety function when the further rotary or pivoting motion about the transverse axis is greater than a threshold value.

2. The control method as recited in claim 1 wherein an angular velocity of the further rotary or pivoting motion about the transverse axis is detected and the safety function is deactivated when the angular velocity exceeds the threshold value.

3. The control method as recited in claim 2 wherein the safety function activates a brake of the motor.

4. The control method as recited in claim 1 wherein the motor is started in response to an actuation of a main switch of the motor and the detecting of the rotary motion and the detecting of the further rotary motion are activated before or upon the starting of the motor.

5. The control method as recited in claim 1 wherein the rotary motion and further rotary motion are detected by a gyro sensor.

6. The control method as recited in claim 1 wherein the safety function is triggered when an instantaneous angular velocity of the hand-held power tool about the working axis exceeds a critical angular velocity.

7. The control method as recited in claim 1 wherein the motor includes a brake and further comprising transmitting a brake signal to activate the brake when the safety function is triggered.

8. The control method as recited in claim 7 further comprising interrupting the transmission of the brake signal when the further rotary or pivoting motion about the transverse axis is greater than the threshold value.

9. A hand-held power tool comprising:
a tool holder;
a hammer mechanism;
a motor for rotationally driving the tool holder about a working axis and for driving the hammer mechanism;
a rotary motion sensor detecting a rotary motion of the hand-held power tool about the working axis and a further rotational or pivot motion about a transverse axis extending transversely to the working axis; and
a protective device triggering a safety function for reducing a torque output of the motor when the rotary motion about the working axis exceeds a limiting value, the protective device including a monitor suppressing the safety function when the further rotary or pivoting motion about the transverse axis is greater than a threshold value.

10. The hand-held power tool as recited in claim 9 wherein the rotary motion sensor is a gyro sensor.

11. The hand-held power tool as recited in claim 9 wherein the rotary motion sensor outputs a measuring signal and the protective device further includes an evaluation unit processing the measuring sensor.

12. The hand-held power tool as recited in claim 9 wherein the protective device triggers the safety function when an instantaneous angular velocity of the hand-held power tool about the working axis exceeds a critical angular velocity.

13. The hand-held power tool as recited in claim 9 wherein the motor includes a brake and the protective device transmits a brake signal to activate the brake when the safety function is triggered.

14. The hand-held power tool as recited in claim 13 wherein the protective device includes a switch, the switch interrupting the transmission of the brake signal when the further rotary or pivoting motion about the transverse axis is greater than the threshold value.

Assignees

• Hilti Ag

Inventors

• Gut Manuel
• Schaer Roland
• Wierer Michael
• Kinkeldei Thomas

Classifications

• B25F5/00 Primary

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B25D2250/221

  Sensors · CPC title

• B23Q11/0092

  actuating braking or stopping means · CPC title

• B25F5/025 Primary

  with torque reaction bars for rotary tools · CPC title

• B25D16/00

  Portable percussive machines with superimposed rotation {, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit (combined percussion and rotary drilling adapted for earth drilling E21B6/00)} · CPC title