Eccentric grinder

• US 5,261,190 A
• Filed: 08/15/1991
• Issued: 11/16/1993
• Est. Priority Date: 03/02/1989
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Braunbach, Karl-Heinz, Berger, Gunther
• Primary Examiner(s): PARKER JR, ROSCOE
• Application Number:
  US07/752,440
• Time in Patent Office: 824 Days
• Field of Search: 51/170 R, 51/170 MT, 51/119, 51/120
• 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 housing provided with a gear rim an eccentrically rotating grinding disc provided with a gear rim which rolls on the gear rim of the housing and in operation without load provides an additional rotary movement of the grinding disc. The gear rim of the grinding disc is a friction rim so that in operation without load there is a minimum slippage and in operation under load there is a maximum slippage of the rims relative to one another. The gear rim of the housing is fixed to the housing and includes a toothed rim which is formed by a ring-shaped toothed belt with a toothing while the gear rim of the grinding disc has a plurality of projections which incompletely engage in the toothing of the gear rim of the housing and therefore an elastic deformation of the projections gives the grinding disc a shaking movement with partial meshing under maximum slippage.

Claims

1. An eccentric grinder, comprising a housing provided with a gear rim;

an eccentrically rotating grinding disc provided with a gear rim which rolls on said gear rim of said housing and in operation without load provides an additional rotary movement of said grinding disc, said gear rim of said grinding disc being a friction rim so that in operation without load there is a minimum slippage and in operation under load there is a maximum slippage of said rims relative to one another, said gear rim of said housing being fixed to said housing and includes a toothed rim which is formed by a ring-shaped toothed belt with a toothing while said gear rim of said grinding disc has a plurality of flexible projections which incompletely engage in said toothing of said gear rim of said housing and therefore an elastic deformation of said flexible projections gives said grinding disc a shaking movement with partial meshing under maximum slippage.

2. An eccentric grinder as defined in claim 1, wherein said gear rim of said grinding disc includes a rim-type support collar and a ring-type toothed belt held on said rim-type support collar.

3. An eccentric grinder as defined in claim 1;

and further comprising a friction lining supported on said gear rim of said grinding disc.

4. An eccentric grinder as defined in claim 3, wherein said friction lining of said gear rim is formed as an elastic ring.

5. An eccentric grinder as defined in claim 3, wherein said friction lining is provided with a plurality of elastic spikes which form said projections.

6. An eccentric grinder as defined in claim 3, wherein said friction lining is provided with a plurality of bristles which form said projections.

7. An eccentric grinder as defined in claim 1, wherein said gear rims are composed of toothed belts and formed as friction rims.

8. An eccentric grinder as defined in claim 1;

and further comprising a further gear rim provided on said housing and formed so that when said grinding disc is removed a further grinding disc provided with a further gear rim different from said first mentioned gear rim of said first mentioned grinding disc can be mounted and said further gear rim provided on said housing engages with said further gear rim of said further grinding disc.

9. An eccentric grinder as defined claim 1;

and further comprising reversing wheels, said gear rims being arranged on said reversing wheels on both sides.