Hand-held power tool

Patent metadata

Field	Value
Publication number	US-11945085-B2
Application number	US-202017635267-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Sep 6, 2019
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A hand-held power tool, in particular a hammer drill or combination hammer, having a tool fitting for holding a striking and rotating tool on a working axis, an electric motor coupled to a transmission shaft, an impact mechanism, which has a striker that is moved periodically along the working axis, and having a rotary drive, which drives a guide tube carrying the tool fitting in rotation about the working axis, wherein the rotary drive is coupled to the transmission shaft via a rocker lever.

First claim

What is claimed is:

1. A hand-held power tool comprising:
a tool fitting for holding a striking and rotating tool on a working axis;
an electric motor coupled to a transmission shaft;
an impact mechanism having a striker movable periodically along the working axis; and
a rotary drive drives a guide tube carrying the tool fitting in rotation about the working axis, the rotary drive being coupled to the transmission shaft via a rocker lever;
wherein the impact mechanism has a transmission component for converting the rotary movement of the transmission shaft into a periodic movement in translation parallel to the working axis; wherein the impact mechanism has an exciter piston connected to the transmission component, and a pneumatic chamber, wherein the striker is coupled to the exciter piston via the pneumatic chamber; and wherein the rotary drive and the impact mechanism are coupled to the transmission shaft such that an advancing movement of the exciter piston takes place in a phase-shifted manner with respect to a torque transmission via a swivel sleeve.

2. The hand-held power tool as recited in claim 1 wherein the rocker lever is coupled to the transmission shaft via an eccentric bearing.

3. The hand-held power tool as recited in claim 1 wherein the rotary drive has a swivel sleeve arranged coaxially with the guide tube, the guide tube rotatable about the working axis via the swivel sleeve, the swivel sleeve having a peg mounted in a joint bearing of the rocker lever.

4. The hand-held power tool as recited in claim 3 wherein the rotary drive has a freewheel sleeve arranged coaxially with the guide tube and allowing a torque to be transmitted from the swivel sleeve to the guide tube only in a direction opposite a freewheeling direction.

5. The hand-held power tool as recited in claim 3 wherein an axis of rotation of the rocker lever extends parallel to the transmission shaft.

6. The hand-held power tool as recited in claim 3 wherein an axis of rotation of the rocker lever lies between an eccentric bearing and the joint bearing.

7. The hand-held power tool as recited in claim 1 wherein the transmission component has an impact-mechanism eccentric wheel or a wobble plate.

8. The hand-held power tool as recited in claim 2 wherein the eccentric bearing is assigned a rotary-drive eccentric wheel.

9. The hand-held power tool as recited in claim 8 wherein the rotary-drive eccentric wheel is formed integrally with the transmission shaft.

Assignees

• Hilti Ag

Inventors

• Ludwig Manfred
• Manschitz Erwin
• FüNFER JOSEF

Classifications

• 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

• B25D11/062 Primary

  comprising a wobbling mechanism, swash plate · CPC title

• B25D11/125

  with a fluid cushion between the crank drive and the striking body · CPC title

• B25D2250/095

  Electric motors · CPC title

• B25D2250/175

  Phase shift of tool components · CPC title