Handheld power tool device

• US 9,144,875 B2
• Filed: 11/17/2010
• Issued: 09/29/2015
• Est. Priority Date: 11/17/2009
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schlesak, Gerd, Klee, Christoph, Lennartz, Juergen
• Primary Examiner(s): Long, Robert
• Application Number:
  US12/948,434
• Publication Number:
  US 20110114345A1
• Time in Patent Office: 1,777 Days
• Field of Search: 173/18, 173/2, 173/29, 173/176, 173180-181, 340/680
• US Class Current: 1/1
• CPC Class Codes: B23Q 11/0092 actuating braking or stopping means
• CPC Class Codes: B23Q 17/22 for indicating or measuring existing or desired position of tool or work B23Q16/005 takes precedence
• CPC Class Codes: B25D 17/00 Details of, or accessories for, portable power-driven percussive tools details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00
• CPC Class Codes: B25D 2250/221 Sensors
• CPC Class Codes: B25F 5/024 as part of an auxiliary handle

Abstract

The invention is based on a handheld power tool device, having at least one safety mechanism, which intervenes in an uncontrolled blocking situation, and which has a sensor unit. It is proposed that the sensor unit is provided for directly detecting at least one orientation parameter of a handheld power tool.

Claims

1. A safety device for use in a handheld power tool having housing, a tool insert fastener for engaging a tool and a drive motor connected to a power supply within the housing and operably coupled to the tool insert fastener for rotating the tool about an axis of rotation extending longitudinally through the tool insert fastener, said device comprising:

at least one safety mechanism configured to disconnect the drive motor from the power supply or to decouple the drive motor from the tool insert fastener to interrupt the rotation of the tool about the axis of rotation in an uncontrolled blocking situation in which the tool seizes in a workpiece causing the housing to rotate about the axis of rotation;

a sensor unit associated with the housing and configured to generate data directly indicative of a rotational orientation of the housing relative to the axis of rotation; and

a computation unit configured to compare said data generated by said sensor unit at staggered times and to activate the at least one safety mechanism in response to the comparison.

2. The safety device as defined by claim 1, wherein the data generated by said sensor unit, in at least one operating state, includes data indicative of the spatial orientation of the Earth'"'"'s magnetic field relative to the axis of rotation.

3. The tool safety device as defined by claim 1, wherein the data generated by said sensor includes at least two different orientation parameters which describe the rotational orientation of the housing relative to the axis of rotation.

4. The safety device as defined by claim 2, wherein the data generated by said sensor includes at least two different orientation parameters which describe aft the rotational orientation of the housing relative to the axis of rotation.

5. The safety device as defined by claim 1, wherein the computation unit is operable to compare a difference in said data at different times comparing with a shutoff threshold value and to activate the at least one safety mechanism if the difference is outside said shutoff threshold value.

6. The safety device as defined by claim 2, wherein the computation unit is operable to compare a difference in said data at different times with a shutoff threshold value and to activate the at least one safety mechanism if the difference is outside said shutoff threshold value.

7. The safety device as defined by claim 3, wherein the computation unit is operable to compare a difference in said data at different times with a shutoff threshold value and to activate the at least one safety mechanism if the difference is outside said shutoff threshold value.

8. The safety device as defined by claim 4, wherein the computation unit is operable to compare a difference in said data at different times with a shutoff threshold value and to activate the at least one safety mechanism if the difference is outside said shutoff threshold value.

9. The safety device as defined by claim 1, wherein the sensor unit is spaced apart from components which essentially influence a detection of the Earth'"'"'s magnetic field.

10. The safety device as defined by claim 8, wherein the sensor unit is spaced apart from components which essentially influence a detection of the Earth'"'"'s magnetic field.

11. The safety device as defined by claim 1 in which the device includes a handle for holding the device with a trigger mechanism for controlling the drive motor, the device further comprising an additional handle in which the sensor unit is disposed.

12. The safety device as defined by claim 1, wherein the safety mechanism has a transmission device, which in at least one operating state transmits a sensor parameter in wireless fashion.

13. The safety device as defined by claim 1, wherein the safety mechanism has an energy receiving device, which is provided for receiving operating energy transmitted in wireless fashion.

14. The safety device as defined by claim 13, wherein the energy receiving device, in at least one operating state, receives energy output by a drive motor.

15. A handheld power tool having a safety device as defined by claim 1.