# US 5,707,275 A · Clamping device for clamping a tool

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- Number: US 5,707,275 A
- Document ID: US5707275A
- Status: Granted
- Kind: A
- Application number: 08/594,472
- Filed: 1996-01-31
- Granted: 1998-01-13
- Earliest claimed: 1995-03-14
- Assignees: Atlas Copco Elektrowerkzeuge GmbH
- Inventors: Erich Preis; Siegfried Stammele; Alfred Schmidt; Herbert Piater
- Web page: https://patentgrep.com/patent/US5707275A

## CPC

- B24B 23/02: with rotating grinding tools; Accessories therefor
- B24B 45/006: {Quick mount and release means for disc-like wheels, e.g. on power tools}
- B24D 5/16: Bushings; Mountings
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)

## Abstract

In a clamping device for clamping a disk-shaped tool to a threaded spindle of a hand-held machine tool, a nut part, which can be screwed onto the threaded spindle, presses a face plate against the tool. An axial rolling bearing is arranged between the nut part and the face plate. To achieve simple and reliable manual clamping and release, in conjunction with a slip clutch function under overload, a spring is arranged between the face plate and the nut part next to the axial rolling bearing. The spring forms a non-rotatable frictionally engaged connection between the nut part and the face plate. The axial rolling bearing supports the face plate on the nut part. The nut part slips in relation to the face plate when an upper limit value of the torque transmitted is exceeded, and the axial rolling bearing rotates.

## Claims

### Claim 1

A clamping device for clamping a disk shaped tool on a threaded spindle of a hand-held machine tool, comprising:
a face plate for pressing against the tool;
a nut part which can be screwed onto the threaded spindle for pressing the face plate;
an axial rolling bearing arranged between said nut part and said face plate; and
a spring arranged between said face plate and said nut plate adjacent to said axial rolling bearing, said spring defining a frictionally engaged connection between said nut part and said face plate to transmit torque from said threaded spindle to said tool, said axial rolling bearing axially supporting said face plate whereby said nut part slips through in relation to said face plate when an upper limit value of torque is exceeded, allowing said axial rolling bearing to rotate.

### Claim 2 (depends on 1)

A clamping device according to claim 1, wherein said spring is a disk spring.

### Claim 3 (depends on 1)

A clamping device according to claim 1, wherein said spring is pretensioned and a setting and release of said frictionally engaged connection takes place in a flat section of the characteristic curve of said spring.

### Claim 4 (depends on 2)

A clamping device according to claim 2, wherein said spring is pretensioned and a setting and release of said frictionally engaged connection takes place in a flat section of the characteristic curve of said spring.

### Claim 5 (depends on 1)

A clamping device according to claim 1, wherein said axial rolling bearing is a needle bearing.

### Claim 6 (depends on 2)

A clamping device according to claim 2, wherein said disk spring encloses said axial rolling bearing in a radial plane.

### Claim 7 (depends on 1)

A clamping device according to claim 1, further comprising a clamping washer which is in contact with said nut part, said spring disk being supported on said clamping washer.

### Claim 8 (depends on 1)

A clamping device according to claim 1, wherein said nut part is formed of a nut and a bell non-rotatably arranged on said nut part.

### Claim 9 (depends on 8)

A clamping device according to claim 8, wherein said bell surrounds said face plate on an outside.

### Claim 10 (depends on 1)

A clamping device according to claim 1, further comprising a pivotable flap mounted on said nut part for actuating said nut part.

### Claim 11 (depends on 8)

A clamping device according to claim 8, further comprising a pivotable flap connected to said bell for actuating said nut part.

### Claim 12 (depends on 10)

A clamping device according to claim 10, wherein said flap is loaded in a locked position by means of said spring.

### Claim 13 (depends on 10)

A clamping device according to claim 10, wherein said flap is designed and arranged such that said flap comes into contact with said nut part in a turned up position under action of centrifugal force of said nut part, during rotation.