Safety guard device

Patent metadata

Field	Value
Publication number	US-9421670-B2
Application number	US-201314411363-A
Country	US
Kind code	B2
Filing date	Apr 25, 2013
Priority date	Jun 25, 2012
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A safety guard device includes at least one base body and at least one safety-guard anti-rotation lock that has at least one braking element. The at least one braking element is configured to at least secure the base body against rotation relative to a hand-held power tool by a frictional connection in at least one operating mode of the hand-held power tool. The safety-guard anti-rotation lock comprises at least one self-amplification unit that is configured to increase the braking force between at least one part of the hand-held power tool and the at least one braking element in the braking state.

First claim

The invention claimed is:

1. A guard device comprising:
at least one basic element and
at least one guard anti-twist device having at least one braking element that, in at least one operating state of a portable power tool, is configured at least for a frictional anti-twist locking of the basic element relative to the portable power tool,
wherein the guard anti-twist device comprises at least one self-energizing unit configured to increase a braking force between at least one part of the portable power tool and the at least one braking element in a braking state, and
wherein the guard anti-twist device comprises at least one bearing unit configured to movably support the braking element at least in a braking state.

2. The guard device according to claim 1 , wherein the at least one self-energizing unit at least partially comprises the at least one braking element.

3. The guard device according to claim 2 , wherein the at least one braking element has a contour configured to increase a braking force between at least one part of the portable power tool and the at least one braking element in a braking state.

4. The guard device according to claim 1 , wherein the bearing unit and the self-energizing unit are configured at least partially in one piece.

5. The device according to claim 1 , wherein the bearing unit is configured to support the at least one braking element such that this is tiltable about at least one axis.

6. The guard device according to claim 5 , wherein the at least one axis extends at least substantially perpendicularly to a radial direction.

7. The guard device according to claim 5 , wherein the at least one axis extends at least substantially parallel to a radial direction.

8. A portable power tool, comprising:
at least one guard device;
a collar configured to receive the at least one guard device, the guard device including:
at least one basic element; and
at least one guard anti-twist device having at least one braking element that, in at least one operating state of a portable power tool, is configured at least for a frictional anti-twist locking of the basic element relative to the portable power tool; and

at least one braking region which has at least one tilting element which is configured to, in a braking state, correspond with the at least one braking element of the guard device;
wherein the guard anti-twist device comprises at least one self-energizing unit configured to increase a braking force between at least one part of the portable power tool and the at least one braking element in a braking state,
wherein the braking region comprises at least one braking groove in which the at least one braking element engages in a fitted state, and
wherein the at least one tilting element is disposed on a groove bottom of the at least one braking groove or on at least one groove wall of the at least one braking groove.

9. A system, comprising:
at least one portable power tool including a collar; and
at least one guard device received by the collar, the guard device including:
at least one basic element; and
at least one guard anti-twist device having at least one braking element that, in at least one operating state of a portable power tool, is configured at least for a frictional anti-twist locking of the basic element relative to the portable power tool,
wherein the guard anti-twist device comprises at least one self-energizing unit configured to increase a braking force between at least one part of the portable power tool and the at least one braking element in a braking state, and
wherein the at least one braking element has a contour configured to increase a braking force between at least one part of the portable power tool and the at least one braking element in a braking state; and
wherein the contour of the at least one braking element defines a curved frictional engagement surface having a center point that is offset from a center point of the collar.

Assignees

• Bosch Gmbh Robert

Inventors

• Boeck Cornelius
• Schadow Joachim
• Overbeck Tobias
• Vollmer Rainer

Classifications

• B24B55/052 Primary

  with rotating tools · CPC title

• B24B23/028

  Angle tools · CPC title