# US 5,706,903 A · Tool

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- Number: US 5,706,903 A
- Document ID: US5706903A
- Status: Granted
- Kind: A
- Application number: 08/419,507
- Filed: 1995-04-10
- Granted: 1998-01-13
- Earliest claimed: 1991-09-26
- Assignees: Robert Bosch GmbH
- Inventors: Alfred Odendahl; Karl Wanner
- Web page: https://patentgrep.com/patent/US5706903A

## CPC

- B25D 17/088: {with radial movable locking elements co-operating with bit shafts specially adapted therefor}
- B25D 2217/0003: Details of shafts of percussive tool bits
- B25D 2217/0034: Details of shank profiles
- B25D 2217/0038: Locking members of special shape
- B25D 2217/0042: Ball-shaped locking members
- Y10T 279/17068: Rotary socket
- B25D: PERCUSSIVE TOOLS {(percussive machines for forging B21J; hand-held drilling machines, in general B23B45/00, for wood B27C3/08; drilling machines, used for mining or quarrying, with reciprocating tool which is turned intermittently when out of contact with the working face E21B1/00)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A device on machine tools for transmitting a rotational and/or percussive movement to a tool (22) has two or three rotational drivers (14) which are arranged so as to be symmetrical with respect to rotation. The rotational drivers (14) are stepped and flank parts (16) extending radially to the center axis (15) alternate with guide portions (17) extending along a cylindrical outer surface. Locking members (20) which engage in depressions (28) at the tool (22) are arranged in the region of the rotational drivers (14) for the axial locking of the tools (10). With the tool holder (10) according to the invention, tool shafts having diameters between 8 and 12 mm can be clamped without converting or modifying the tool shafts. Good true running characteristics can be achieved in spite of the stationary rotational drivers (14).

## Claims

### Claim 1

A tool for at least one of a drill chuck and a tool holder having a plurality of inwardly projecting rotational drivers with flanks extending approximately radially and connected by guide portions, for a hand-held drill or hammer device, the tool comprising a shaft provided with a plurality of grooves which are arranged to receive the drivers and located at angular intervals at a circumference of said shaft, said grooves having at least on one side a plurality of substantially planar lateral walls which are arranged approximately radially to a tool axis in a stepped manner and are connected with one another by connecting portions.

### Claim 2 (depends on 1)

A tool as defined in claim 1, wherein said connecting portions extend along a cylindrical outer surface.

### Claim 3 (depends on 1)

A tool as defined in claim 1, wherein said grooves are spaced from one another by equal angular intervals.

### Claim 4 (depends on 1)

A tool as defined in claim 1, wherein said shaft has depressions which form axial extensions of said grooves.