Sensor device, in particular hand-held power-tool sensor device

Patent metadata

Field	Value
Publication number	US-10322502-B2
Application number	US-201514863754-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Sep 25, 2014
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

The disclosure is based on a sensor device, in particular a hand-held power-tool sensor device, for identifying an uncontrolled occurrence of jamming in the case of a hand-held power tool, having at least one sensor unit, which is provided to sense at least one motion characteristic value of the hand-held power tool, and having a protective unit, which is provided to control the hand-held power tool in dependence on at least one triggering threshold value and the at least one motion characteristic value. It is proposed that the protective unit be provided to set the at least one triggering threshold value in a variable manner and/or to define at least one further triggering threshold value.

First claim

What is claimed is:

1. A sensor device of a hand-held power-tool for identifying an uncontrolled occurrence of jamming of the hand-held power tool, the sensor device comprising:
a sensor unit configured to sense a motion characteristic value of the hand-held power tool, the motion characteristic value based on a motion of the hand-held power-tool; and
a protective unit operably connected to the sensor unit and configured to control the hand-held power tool based on a first triggering threshold value, a second triggering threshold value that is greater than the first triggering threshold value, and the sensed motion characteristic value, the protective unit configured to (i) sense that the motion characteristic value has exceeded the first triggering threshold value as a first triggering case, (ii) switch off the power-tool in response to the first triggering case, (iii) to sense that the motion characteristic value has exceeded the first triggering threshold value as a second triggering case subsequent to the first triggering case, (iv) switch off the power-tool in response to the second triggering case, and (v) raise the first triggering threshold value to the second triggering threshold value when the first triggering case and the second triggering case occur within a predetermined time period, such that the protective unit prevents further switching off of the power-tool in response to sensing that the motion characteristic value has exceeded the first triggering threshold value.

2. The sensor device according to claim 1 , wherein the protective unit is configured to set the first triggering threshold value based on a triggering frequency.

3. The sensor device according to claim 1 , wherein the protective unit is configured to reset the first triggering threshold value after operation of the hand-held power tool.

4. The sensor device according to claim 1 , wherein the protective unit is configured to set the first triggering threshold value based on at least one operating mode of the hand-held power tool.

5. The sensor device according to claim 1 , wherein:
the protective unit is configured to set the first triggering threshold value based on at least one transmission characteristic value of the hand-held power tool, and
the transmission characteristic value includes at least one of gear stage data and transmission ratio data.

6. The sensor device according to claim 1 , wherein:
the protective unit is configured to set the first triggering threshold value based on at least one rotational-speed characteristic value of the hand-held power tool, and
the at least one rotational-speed characteristic value includes at least one of (i) an output rotational speed of the hand-held power tool, (ii) a motor rotational speed of the hand-held power tool, and (iii) a transmission rotational speed of the hand-held power tool.

7. The sensor device according to claim 1 , further comprising:
at least one operating-mode sensor unit configured to sense the operating mode of the hand-held power tool.

8. The sensor device according to claim 1 , wherein the protective unit is configured to control the hand-held power tool such that the hand-held power tool executes differing operations based on the first triggering threshold value and the at least one motion characteristic value, and based on the second triggering threshold value and the at least one motion characteristic value.

9. The sensor device according to claim 1 , wherein the protective unit is configured to switch off the hand-held power tool for a first pre-determined time and switch the hand-held power tool back on automatically after the first pre-determined time when the at least one motion characteristic value is equal to or above the first triggering threshold value.

10. The sensor device according to claim 1 , wherein the protective unit is configured to switch off the hand-held power tool permanently when the at least one motion characteristic value is equal to or above the second triggering threshold value.

11. The sensor device according to claim 1 , wherein the predetermined time period is one minute.

12. The sensor device according to claim 1 , wherein the protective unit is further configured to (i) to sense that the motion characteristic value has exceeded the second triggering threshold value as a third triggering case, and (ii) switch off the power-tool in response to the third triggering case.

13. The sensor device according to claim 1 , wherein the protective unit is further configured to (i) sense that the motion characteristic value has exceeded the first triggering threshold value as a first triggering case, (ii) at least one of (a) switch off the power-tool in response to the first triggering case temporarily and switch on the power-tool automatically and (b) switch off the power-tool in response to the first triggering case permanently, (iii) to sense that the motion characteristic value has exceeded the first triggering threshold value as a second triggering case subsequent to the first triggering case, (iv) at least one of (a) switch off the power-tool in response to the second triggering case temporarily and switch on the power-tool automatically and (b) switch off the power-tool in response to the second triggering case permanently, (v) raise the first triggering threshold value to the second triggering threshold value when the first triggering case and the second triggering case occur within a predetermined time period, such that the protective unit prevents further switching off of the power-tool in response to sensing that the motion characteristic value has exceeded the first triggering threshold value, and (vi) switch on the hand-held power tool automatically when the at least one triggering threshold value.

14. A hand-held power tool comprising:
a sensor device for identifying an uncontrolled occurrence of jamming of the hand-held power tool, the sensor device comprising:
a sensor unit configured to sense a motion characteristic value of the hand-held power tool, the motion characteristic value based on a motion of the hand-held power-tool; and
a protective unit operably connected to the sensor unit and configured to control the hand-held power tool based on a first triggering threshold value, a second triggering threshold value that is greater than the first triggering threshold value, and the motion characteristic value, the protective unit configured to (i) sense that the motion characteristic value has exceeded the first triggering threshold value as a first triggering case during a first operation, (ii) switch off the power-tool in response to the first triggering case, (iii) to sense that the motion characteristic value has exceeded the first triggering threshold value as a second triggering case subsequent to the first triggering case, (iv) switch off the power-tool in response to the second triggering case, and (v) raise the first triggering threshold value to the second triggering threshold value if the first triggering case and the second triggering case occur within a predetermined time period, such that the protective unit prevents further switching off of the power-tool in response to sensing that the motion characteristic value has exceeded the first triggering threshold value.

15. The hand-held power tool of claim 14 , wherein the hand-held power tool is a hammer drill.

16. A method for identifying an uncontrolled occurrence of jamming of a hand-held power tool, the method comprising:
sensing a motion characteristic value of the hand-held power tool with a sensor unit of the power tool, the motion characteristic va

Assignees

• Bosch Gmbh Robert

Inventors

• Wirnitzer Bernd
• Tauber Matthias
• Wiess Christopher
• Klee Christoph
• Keinath Hagen Philipp
• Lang Christian
• Schlegel Andreas
• Holst Stefan

Classifications

• B23Q11/0092

  actuating braking or stopping means · CPC title

• B25D16/00 Primary

  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

• B25D2250/221

  Sensors · CPC title

• 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

• F16P7/02

  by causing the machine to stop on the occurrence of dangerous conditions therein (devices in bearings affected by abnormal conditions F16C) · CPC title