# US 2014/0193219 A1 · Rotary Cutting Tool and Tool Unit

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- Number: US 2014/0193219 A1
- Document ID: US20140193219A1
- Status: Published application
- Kind: A1
- Application number: 14/142,786
- Filed: 2013-12-28
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Kennametal Inc.
- Applicants: Kennametal Inc.
- Inventors: Josef K. Herud
- Web page: https://patentgrep.com/patent/US20140193219A1

## CPC

- B23B 51/00: Tools for drilling machines
- B23B 31/005: {Cylindrical shanks of tools}
- B23B 31/1075: {Retention by screws}
- B23B 51/02: Twist drills
- B23B 2231/026: Grooves
- B23B 2260/0725: Spiral
- Y10T 279/17761: Side detent
- Y10T 279/17821: Set screw
- Y10T 407/1946: Face or end mill
- Y10T 408/885: including tool-holding clamp and clamp actuator
- Y10T 408/907: including detailed shank
- Y10T 409/30952: with cutter holder
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A rotary cutting tool, in particular a drill or milling cutter for heavy-duty cutting applications, is provided, said rotary cutting tool having at least one cutting edge and a shank having a free end. The shank has in its circumferential surface a groove for receiving a pull-out prevention element, wherein the groove extends axially and at the same time at least partially along the circumference of the shank and, starting at a distance from the free end of the shank, in the direction of the opposite free end. Also provided is a tool unit for a rotary cutting tool.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A rotary cutting tool, in particular a drill or milling cutter for heavy-duty cutting applications, comprising:
at least one cutting edge and a shank having a free end; and
said shank having in its circumferential surface a groove for receiving a pull-out prevention element,
wherein the groove extends axially and at the same time at least partially along the circumference of the shank and, starting at a distance from the free end of the shank, in the direction of the opposite free end.

### Claim 12 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove extends only in the axial center of the shank, in particular in the central third.

### Claim 13 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove extends helically around the shank with a constant pitch.

### Claim 14 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove as a whole extends at most over half the circumference of the shank.

### Claim 15 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove as a whole extends along the shank over an axial length of at most 15 mm.

### Claim 16 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove has a round profile as seen transversely to its longitudinal extension.

### Claim 17 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove has the same direction of rotation as the cutting edge.

### Claim 18 (depends on 11)

A tool unit composed of a tool holder and a rotary cutting tool as claimed in claim 11, wherein the tool holder has a receptacle for the shank and a pull-out prevention element which extends into the groove in the tool in order to prevent the tool from being pulled axially out of the receptacle during operation.

### Claim 19 (depends on 18)

The tool unit as claimed in claim 18, characterized in that the groove has an axial extent which corresponds to the axial extent of the pull-out prevention element.

### Claim 20 (depends on 19)

The tool unit as claimed in claim 19, characterized in that the pull-out prevention element is adjustable laterally from a starting position, in which it does not project radially into the receptacle, into a locking position, in which it projects into the groove.

### Claim 21 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove extends helically around the shank with a varying pitch.

### Claim 22 (depends on 11)

The rotary cutting tool as claimed in claim 11, wherein the groove has an angular profile as seen transversely to its longitudinal extension.

### Claim 23 (depends on 15)

The rotary cutting tool as claimed in claim 15, wherein the groove as a whole extends along the shank over an axial length of at most 10 mm.

### Claim 24

A rotary cutting tool, comprising:
at least one cutting edge and a shank having a free end; and
said shank having in its circumferential surface a groove for receiving a pull-out prevention element,
wherein the groove extends axially and at the same time at least partially along the circumference of the shank and, starting at a distance from the free end of the shank, in the direction of the opposite free end,
wherein the groove extends only in the axial center of the shank.