ECCENTRIC GRINDER

• US 20100062695A1
• Filed: 10/30/2007
• Published: 03/11/2010
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Heber, Andreas, Roehm, Heiko
• Granted Patent: US 8,105,132 B2
• Time in Patent Office: Days
• 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) being provided, which includes a friction braking element (17) located on the housing (2), and a friction surface (16) on the grinding plate (8), which is to be acted upon with a frictional force by friction braking element (17),

wherein

the friction surface (16) on grinding plate (8) slopes downward in the 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).

2. The eccentric grinder as recited in claim 1,

wherein

the friction surface (16) is conical in design.

3. The eccentric grinder as recited in claim 2,

wherein

the running surface forms a taper angle (α

) of at least 5°

relative to the horizontal.

4. The eccentric grinder as recited in claim 1,

wherein

the friction braking element (17) is designed as a friction ring.

5. The eccentric grinder as recited in claim 1,

wherein

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

6. 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.

7. The eccentric grinder as recited in claim 1,

wherein

the frictional surface (16) is located on a contact component (21), which is designed separate from the grinding plate (8), and which is connected with the grinding plate (8).

8. The eccentric grinder as recited in claim 1,

wherein

the contact component (21) is made is of a different material than that of the grinding plate (8).

9. 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).

10. The eccentric grinder as recited in claim 1,

wherein

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

11. The eccentric grinder as recited in claim 1,

wherein

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