Manual machine-tool comprising a braking means

• US 6,890,247 B2
• Filed: 05/07/2002
• Issued: 05/10/2005
• Est. Priority Date: 07/14/2001
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Dehde, Joerg
• Primary Examiner(s): Morgan, Eileen P.
• Application Number:
  US10/333,084
• Publication Number:
  US 20040038622A1
• Time in Patent Office: 1,099 Days
• Field of Search: 451/359, 451/357
• US Class Current: 451/359
• CPC Class Codes: B24B 23/005 Auxiliary devices used in connection with portable grinding machines, e.g. holders
• CPC Class Codes: B24B 23/03 the tool being driven in a combined movement

Abstract

The invention is based on a hand power tool, in particular a disk-type sander, that comprises a motor (12) with a drive shaft (14) located in a housing, whereby the drive shaft (14)—by way of its side furthest from the motor (12)—is joined via an eccentric (18) with a sanding disk (16) that can walk around an annular, turnably supported means (20, 72) that is capable of being braked via braking means (22, 62).

It is proposed that the annular means (20, 72) are supported in the braking means (22, 62).

Claims

1. A hand power tool in the form of an eccentric disk grinder, comprising a motor (12) with a drive shaft (14) located in a housing (10), whereby the drive shaft (14) is joined via an eccentric (18) end with a sanding disk (16), the eccentric end (18) of the drive shaft (14) facing away from said motor (12), said sanding disk (16) being movable on rolling contact inside an annular means (20, 72), said annular means (20, 72) being rotatably supported in said housing (10), said annular means (20, 72) being further capable of being braked via braking means (22, 62) connected to said housing (10), whereby the annular means (20, 72) is rotatably supported in said housing (10) via the braking means (22, 62).

2. The hand power tool according to claim 1, wherein the annular means (20, 72) has a permanent, active connection with the sanding disk (16).

3. The hand power tool according to claim 1, wherein the annular means (20, 72) comprise teeth (24) around which the sanding disk (16) is moveable via corresponding teeth (26).

4. The hand power tool according to claim 1, wherein the annular means (20, 72) is in the form of a belt.

5. The hand power tool according to claim 1, wherein the cross-section of the annular means (20) is trapezoidal in shape.

6. The hand power tool according to claim 1, wherein torque acting between the annular means (20, 72) and the braking means (22, 62) can be adjusted by means of a switching device (28).

7. The hand power tool according to claim 1, wherein the braking means (22, 62) is tensioned via at least one spring element (30, 60).

8. The hand power tool according to claim 1, wherein braking action is produced by a force acting on the braking means (62) in an axial direction of the braking means.

9. The hand power tool according to claim 1, wherein the braking means (22, 62) has at least two components.

10. The hand power tool according to claim 1, wherein the braking means (22, 62) comprise at least two jaws (34, 36) capable of being pivoted around a pivot axis (32).

11. The hand power tool according to claim 6, wherein the pivot axis (32) is located opposite from the switching device (28).