Hand-held power tool

Patent metadata

Field	Value
Publication number	US-9808868-B2
Application number	US-201414523668-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Oct 25, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

A hand-held power tool is provided which includes a clutch housing of a torque clutch, and a planetary gear, situated in a gear housing, for transmitting a torque which is generated by a drive motor to a drive shaft. The clutch housing cooperates with the planetary gear via a pressure plate. The pressure plate is displaced in the axial direction in order to disengage the torque clutch. The axial relative motion of the pressure plate causes an axial relative motion between a switching element and an associated optical sensor, via which the drive motor may be switched off.

First claim

What is claimed is:

1. A hand-held power tool, comprising:
a clutch housing of a torque clutch;
a gear housing;
a drive motor;
a drive shaft;
a switching element;
an optical sensor associated with the switching element;
a pressure plate displaced in an axial direction in order to disengage the torque clutch; and
a planetary gear situated in the gear housing and for transmitting a torque which is generated by the drive motor to the drive shaft, wherein:
the clutch housing cooperates with the planetary gear via the pressure plate, and
an axial relative motion of the pressure plate causes an axial relative motion between the switching element and the associated optical sensor.

2. The hand-held power tool as recited in claim 1 , wherein:
the switching element is a separate component, and
the switching element is suspended on the pressure plate with little axial play in such a way that the switching element undergoes the same axial relative motion as the pressure plate.

3. The hand-held power tool as recited in claim 1 , wherein:
the pressure plate has a connecting section that is inwardly situated in a radial direction, and
a connection between the pressure plate and the switching element is established via the connecting section.

4. The hand-held power tool as recited in claim 3 , wherein:
the connecting section includes a tappet that protrudes inwardly in the radial direction, and
the switching element accommodates the tappet in a form-fit manner in such a way that an essentially play-free connection between the pressure plate and the switching element is established.

5. The hand-held power tool as recited in claim 3 , wherein:
the connecting section has a cutout, and
the switching element accommodates the cutout in a form-fit manner in such a way that an essentially play-free connection between the pressure plate and the switching element is established.

6. The hand-held power tool as recited in claim 1 , wherein the optical sensor detects the axial relative motion of the switching element, via which the drive motor may be switched off.

7. The hand-held power tool as recited in claim 1 , wherein the switching element protrudes into a closed-off area of the optical sensor via a gap seal ( 312 ).

8. The hand-held power tool as recited in claim 1 , wherein:
the clutch housing includes a slider, and
the slider is capable of being pushed into the optical sensor in such a way that the axial relative motion between the switching element and the optical sensor is not detectable by the optical sensor.

9. The hand-held power tool as recited in claim 8 , wherein the slider includes a switch, the slider being displaceable via the switch.

10. The hand-held power tool as recited in claim 1 , further comprising a further plate, wherein the optical sensor is connected to the further plate.

11. The hand-held power tool as recited in claim 10 , wherein the further plate is mounted on an outside of the clutch housing in the radial direction.

12. The hand-held power tool as recited in claim 10 , wherein the further plate rests against the clutch housing in such a way that the optical sensor is sealed off with respect to the clutch housing to the greatest extent possible.

13. The hand-held power tool as recited in claim 10 , wherein the optical sensor and the further plate are fastened together on a support and form a module, the module being displaceably situated on the clutch housing.

14. The hand-held power tool as recited in claim 1 , wherein the optical sensor is a light barrier.

15. The hand-held power tool as recited in claim 1 , wherein a mechanical overratcheting of the torque clutch is possible when the optical sensor is continually interrupted.

Assignees

• Bosch Gmbh Robert

Inventors

• Kraus Martin
• Roehm Heiko
• Hecht Joachim

Classifications

• B25F5/001 Primary

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

• B25B23/141

  Mechanical overload release couplings · CPC title

• B23B45/008 Primary

  Gear boxes, clutches, bearings, feeding mechanisms or like equipment · CPC title

• B23B2270/48

  Measuring or detecting · 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