Hand-held power tool in which the direction of rotation can be set

Patent metadata

Field	Value
Publication number	US-11034012-B2
Application number	US-201616061773-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 18, 2015
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A hand-held power tool includes an output spindle and a drive unit configured to rotationally drive the output spindle such that the drive unit can be changed over between a first direction of rotation and a second direction of rotation in order to drive the output spindle in the first or second direction of rotation. The hand-held power tool further includes at least one operating element configured to initiate a changeover operation for changing over the drive unit between the first direction of rotation and the second direction of rotation such that the at least one operating element is in form of a monostable switching element.

First claim

The invention claimed is:

1. A hand-held power tool including:
a housing having a handle with a manual switch;
an output spindle;
a drive unit having a drive motor configured to rotationally drive the output spindle and to be changed over between a first direction of rotation and a second direction of rotation in order to drive the output spindle in the first direction of rotation or the second direction of rotation, rotation of the drive motor being activated and deactivated by actuating the manual switch; and
the monostable switch being configured to return to the stable rest position in an absence of the actuation by a user, the monostable switch being configured to actuate only in a first direction from the stable rest position;
a direction of rotation detection device configured to detect a current direction of rotation of the drive motor; and
control electronics configured to, in response to an actuation of the monostable switch while the drive motor is not rotating, initiate a changeover operation in which (i) if the drive motor was most recently rotated in the first direction of rotation, then driver motor is rotated in the second direction of rotation next time the manual switch is actuated and (ii) if the drive motor was most recently rotated in the second direction of rotation, then driver motor is rotated in the first direction of rotation next time the manual switch is actuated.

2. The hand-held power tool as claimed in claim 1 , wherein the monostable switch has a sensor unit configured to generate an actuation signal in response to an actuation of the monostable switch by the user into the unstable switching position.

3. The hand-held power tool as claimed in claim 2 , wherein the actuation signal is configured to set a respectively desired direction of rotation of the output spindle.

4. The hand-held power tool as claimed in claim 3 , wherein the sensor unit of the monostable switch is at least one of a mechanical sensor, an electrical sensor, a magnetic sensor, and an optical sensor.

5. The hand-held power tool as claimed in claim 1 , wherein the direction of rotation detection device is configured to indicate a request to initiate the changeover operation when predefined operating conditions occur.

6. The hand-held power tool as claimed in claim 1 , wherein the monostable switch has a switching rocker, a pushbutton, or a slide configured to move between the stable rest position and the unstable switching position.

7. The hand-held power tool as claimed in claim 1 , wherein the monostable switch has a spring element configured to move the monostable switch into the stable rest position.

8. The hand-held power tool as claimed in claim 1 , wherein the monostable switch has an illumination module is configured to indicate a request to initiate the changeover operation when predefined operating conditions occur.

9. The hand-held power tool as claimed in claim 1 , wherein the control electronics are configured to cause the changeover operation only when the drive motor is at a standstill.

10. The hand-held power tool as claimed in claim 9 , wherein the control electronics are configured to brake the drive motor to a standstill in order to enable the changeover operation.

11. The hand-held power tool as claimed in claim 1 , wherein the monostable switch has a touch-sensitive screen.

12. The hand-held power tool as claimed in claim 11 , wherein the touch-sensitive screen of the monostable switch is configured to indicate a request to initiate the changeover operation and to initiate the changeover operation.

13. The hand-held power tool as claimed in claim 1 , wherein the power tool is configured as a cordless screwdriver or a cordless drill.

Assignees

• Bosch Gmbh Robert

Inventors

• Fuchs Rudolf
• Bantle Florian
• Gairing Juergen

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

• B25F5/001 Primary

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B25B21/00

  Portable power-driven screw or nut setting or loosening tools; (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00; {for mounting or dismounting wheels B60B29/006}); Attachments for drilling apparatus serving the same purpose (machines B23P19/06) · CPC title