Switching device for a hammer drill and hammer drill comprising a switching device

Patent metadata

Field	Value
Publication number	US-11518015-B2
Application number	US-201917266043-A
Country	US
Kind code	B2
Filing date	Aug 8, 2019
Priority date	Aug 21, 2018
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The disclosure relates to a switching device for a hammer drill, having a manually actuatable switching element. It is proposed that the switching element is designed for actuating an operational mode switching unit and a switching unit for changing the direction of rotation.

First claim

The invention claimed is:

1. A switchover device for a hammer drill, comprising:
an operating-mode switchover unit;
a rotational-direction switchover unit; and
a manually actuatable switchover element, configured to actuate the operating-mode switchover unit and the rotational-direction switchover unit,
wherein the switchover element is rotatably mounted such that manual actuation of the switchover element rotates the switchover element about a switchover axis of the switchover element that is aligned with a direction of a work axis of the hammer drill,
wherein the switchover element has a switching device configured to actuate a switching element of the operating-mode switchover unit,
wherein the switching element of the operating-mode switchover unit is arranged in a transmission space of the hammer drill, in which a transmission unit of the hammer drill is arranged, and
wherein the switching element is arranged in a receiving recess, and a sealing ring is arranged in the receiving recess so as to seal the switching element against the receiving recess and avoid the escape of lubricant from the transmission space via the receiving recess.

2. The switchover device as claimed in claim 1 , wherein the switchover element is arranged, at least partially, on an upper side of the hammer drill, which is defined above a horizontal plane that passes through the work axis.

3. The switchover device as claimed in claim 1 , wherein the switchover element is arranged outside of and/or at a distance from the transmission space.

4. The switchover device as claimed in claim 1 , wherein the switchover element is mechanically coupled to the operating-mode switchover unit.

5. The switchover device as claimed in claim 1 , wherein the switchover element is mechanically coupled to the rotational-direction switchover unit.

6. The switchover device as claimed in claim 1 , wherein the switchover element has a further switching device configured to actuate the switching element of the rotational-direction switchover unit.

7. The switchover device as claimed in claim 6 , wherein the switchover element, the switching device, and the further switching device are realized as a single piece.

8. The switchover device as claimed in claim 1 , wherein:
the switchover device has a safeguard element configured such that movement of the safeguard element is coupled to movement of the switchover element, and
the safeguard element is blocked by a corresponding securing element when an operating switch of the hammer drill is activated so as to prevent movement of the switchover element when the operating switch is activated.

9. A hammer drill comprising:
a switchover device comprising:
an operating mode switchover unit;
a rotational-direction switchover unit; and
a manually actuatable switchover element configured to actuate the operating-mode switchover unit and the rotational-direction switchover unit;

a housing, in which an electric motor and a transmission unit are arranged,
wherein a rotational drive motion of the electric motor is transmitted to a motor shaft that is connected to an intermediate shaft to transmit torque, the intermediate shaft being connected to an output shaft and a percussion-mechanism unit so as to transmit torque,
wherein the switchover element is rotatably mounted such that manual actuation of the switchover element rotates the switchover element about a switchover axis of the switchover element that is aligned with a direction of a work axis of the hammer drill,
wherein the switchover element has a switching device configured to actuate a switching element of the operating-mode switchover unit,
wherein the switching element of the operating-mode switchover unit is arranged in a transmission space of the hammer drill, in which a transmission unit of the hammer drill is arranged, and
wherein the switching element is arranged in a receiving recess, and a sealing ring is arranged in the receiving recess so as to seal the switching element against the receiving recess and avoid the escape of lubricant from the transmission space via the receiving recess.

10. The hammer drill as claimed in claim 9 , wherein:
the hammer drill has at least three modes, which are switched via the switchover element,
a first mode of the at least three modes is a hammer-drilling mode,
a second mode of the at least three modes is a first drilling or screwdriving mode in clockwise rotation, and
a third mode of the at least three modes is a second drilling or screwdriving mode in counterclockwise rotation.

11. The switchover device as claimed in claim 6 , wherein the further switching device includes a guide gate configured to actuate the switching element of the rotational-direction switchover unit.

12. The switchover device as claimed in claim 1 , wherein the switching element of the operating-mode switchover unit is arranged in a linearly movable manner in a receiving recess defined in a flange that defines the transmission space.

13. The switchover device as claimed in claim 1 , wherein the transmission space is filled with lubricant and is sealed from remaining interior space of a housing of the hammer drill.

14. The switchover device as claimed in claim 1 , wherein the switchover axis is parallel to the work axis of the hammer drill.

Assignees

• Bosch Gmbh Robert

Inventors

• Rakaczki Janos
• Duerr Thomas
• Finck Carla-Maria
• Bohne Ulrich
• Markovics Andras

Classifications

• B25D2216/0092

  Tool comprising two or more collaborating mode-changing mechanisms · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title

• B25D16/003

  Clutches specially adapted therefor · CPC title

• B25D16/006 Primary

  Mode changers; Mechanisms connected thereto · CPC title

• B25D11/00

  Portable percussive tools with electromotor {or other motor} drive · CPC title