# US 8,770,669 B2 · Cutting tool configuration having wear disc

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- Number: US 8,770,669 B2
- Document ID: US8770669B2
- Status: Granted
- Kind: B2
- Application number: 13/174,426
- Filed: 2011-06-30
- Published: 2012-03-22
- Granted: 2014-07-08
- Earliest claimed: 2010-07-05
- Assignees: BOMAG GmbH
- Applicants: Steffen Wachsmann; Peter Erdmann
- Inventors: Steffen Wachsmann; Peter Erdmann
- Web page: https://patentgrep.com/patent/US8770669B2

## CPC

- E21C 35/183: with inserts or layers of wear-resisting material {(drill bits with wear-resistant parts E21B10/46)}
- E21C: MINING OR QUARRYING

## Abstract

A cutting tool configuration for a ground milling machine, for example, a cold milling machine or a mining drill, is provided. The cutting tool configuration comprises a cutter holder, which is fastenable or fastened on a milling drum, a cutting tool, which is fastened on the cutter holder, and which is inserted using its cutting tool shaft in a cutter holder bore of the cutter holder and can rotate around its longitudinal axis, and a wear disc, which is situated rotation-locked between a stop surface of the cutter holder and the cutting tool head of the cutting tool, it being provided that the rotation lock between the wear disc and the cutter holder is caused by at least one groove formed on the outer circumference of the wear disc and a guide formed on the cutter holder and engaging in this groove. A wear disc for use in such a cutting tool configuration, and a cutting tool having such a preinstalled wear disc, are also provided.

## Claims

### Claim 1

A cutting tool system for a ground milling machine, comprising:
a cutter holder, including a cutting holder bore, a cutter holder stop surface and a cutter holder guide, fastenable on a milling drum;
a cutting tool, including a cutting tool head and a cutting tool shaft, rotatably seated in the cutter holder bore; and
a wear disc, situated between said cutting tool head and said cutter holder stop surface, having a main surface in the form of a circular ring, and enclosing a central bore for the passage of said cutting tool shaft,
wherein said cutter holder guide includes two guide flanks which extend below said stop surface in relation to the longitudinal axis; and
wherein said wear disc includes at least one auxiliary surface, with the auxiliary surface being angled downward in relation to the main surface, and at least one groove formed on said auxiliary surface; and
wherein said cutter holder guide engages said groove to prevent relative rotation between said wear disc and said cutter holder, providing;
a rotation-locked wear disc.

### Claim 2 (depends on 1)

The cutting tool system according to claim 1, wherein the external auxiliary surface area is formed as an edge protector for the cutter holder stop surface.

### Claim 3 (depends on 1)

The cutting tool system according to claim 1, wherein the main surface includes a surface bulge.

### Claim 4 (depends on 1)

The cutting tool system according to claim 1, wherein the wear disc includes a collar that engages the cutter holder bore.

### Claim 5 (depends on 1)

The cutting tool system according to claim 1, wherein the wear disc is integrally formed from a spring steel material.

### Claim 6 (depends on 1)

The cutting tool system according to claim 1, wherein the cutter holder guide includes a wear section.

### Claim 7 (depends on 1)

The cutting tool system according to claim 1, wherein the wear disc being at least temporarily mounted on the cutting tool shaft using a sleeve.

### Claim 8 (depends on 1)

The cutting tool system according to claim 1, wherein the ground milling machine is a cold milling machine, a ground stabilizer/recycler, or a mining drill.