Eccentric grinder

• US 8,105,132 B2
• Filed: 10/30/2007
• Issued: 01/31/2012
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Roehm, Heiko, Heber, Andreas
• Primary Examiner(s): Nguyen, George
• Application Number:
  US12/298,381
• Publication Number:
  US 20100062695A1
• Time in Patent Office: 1,554 Days
• Field of Search: 451/353, 451/357, 451/359, 451/63, 451/548, 451/441, 451/360, 451/533, 451/534, 451/537
• US Class Current: 451/357
• CPC Class Codes: B24B 23/03 the tool being driven in a combined movement

Abstract

An eccentric grinder has a drive which is arranged in a housing and the drive shaft of which drives a supporting shaft of a back-up pad by way of an eccentric mounting. Also provided is a friction braking device, which comprises a friction braking element on the housing and a friction surface on the back-up pad. The friction surface slopes down in the radial direction from the inside to the outside with respect to a horizontal plane that is perpendicular to the axis of rotation of the back-up pad.

Claims

1. An eccentric grinder, with a drive (3) located in a housing (2), the drive shaft (5) of which drives a support shaft (7) of a grinding plate (8) via an eccentric bearing (6), a friction braking device (15) comprising a friction braking element (17) located on the housing (2), designed as a friction ring, and a friction surface (16) on the grinding plate (8),

wherein the friction surface (16) is conical in design and configured to be acted upon with a frictional force by the friction braking element (17),

wherein the friction surface (16) is located on a contact component (21), which contact component (21) is designed to be separate from but connected to the grinding plate (8), and made of a different material than the grinding plate (8), and

wherein the friction surface (16) is arranged on the grinding plate (8) to slope downward in a radial direction, from the inside to the outside, relative to a horizontal plane (20), which is perpendicular to the rotation axis (11) of the grinding plate (8) thereby forming a taper angle (α

) of at least 5°

relative to the horizontal plane (20).

2. The eccentric grinder as recited in claim 1,

wherein the friction braking element (17) is designed to have elastic spring action.

3. The eccentric grinder as recited in claim 1,

wherein the friction braking element (17) includes a compensation section (18), the length of which is expandable and/or compressible in the direction of the application of the frictional force.

4. The eccentric grinder as recited in claim 1,

wherein the frictional surface (16) is made of plastic, e.g., polyamide (PA), polypropylene (PP), polycarbonate (PC), or polymethyl methacrylate (PMMA).

5. The eccentric grinder as recited in claim 1,

wherein the frictional surface (16) is composed of metal, in particular of aluminum or magnesium.

6. The eccentric grinder as recited in claim 1,

wherein the frictional surface (16) is composed of a foamed material.