# US 5,704,745 A · Chuck sleeve insert for a drill

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- Number: US 5,704,745 A
- Document ID: US5704745A
- Status: Granted
- Kind: A
- Application number: 08/707,766
- Filed: 1996-09-04
- Granted: 1998-01-06
- Earliest claimed: 1996-09-04
- Assignees: Credo Tool Company
- Inventors: Juergen Wiker; David H. Byrley; Zane Lockhart, Jr.; Debbie Ann Newhouse; Gregory A. Phillips
- Web page: https://patentgrep.com/patent/US5704745A

## CPC

- B23B 31/005: {Cylindrical shanks of tools}
- B23B 51/0003: {with exchangeable heads or inserts}
- B23B 51/02: Twist drills
- B23B 2231/0204: Connection of shanks to working elements of tools
- B23B 2251/02: Connections between shanks and removable cutting heads
- B23B 2251/247: Drilling tools having a working portion at both ends of the shank
- Y10T 279/3406: Adapter
- Y10T 408/94: Tool-support
- Y10T 408/95: with tool-retaining means
- Y10T 408/957: Tool adapter
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A double-ended drill bit having opposed cutting ends of different structural configurations is provided in combination with a sleeve or holder to be received within a drill chuck. The sleeve is provided with a cylindrical body having a top end with a pair of helically-shaped longitudinally extending members in spaced mating relation attached thereto. One cutting end of a drill bit is received within the cylindrical body and the spaced helically-shaped members.

## Claims

### Claim 1

A sleeve for a drill bit comprising:
a cylindrical body having a top end, an opposed end, and a centrally disposed opening; and,
means to receive a cutting end of a twist drill bit having two flutes, said means being attached to said top end of said cylindrical body, said means to receive said cutting end of a twist drill bit being a pair of flexible helically-shaped longitudinally extending members in spaced mating relation.

### Claim 2 (depends on 1)

The sleeve of claim 1, said sleeve being of unitary construction.

### Claim 3 (depends on 2)

The sleeve of claim 2, said sleeve being constructed of a hard plastic material.

### Claim 4 (depends on 1)

The sleeve of claim 1, said helically-shaped longitudinally extending members having a cross-sectional surface diameter equal to or greater than the cross-sectional surface diameter of said cutting ends.

### Claim 5 (depends on 1)

The sleeve of claim 1, said twist drill bit having two opposed cutting ends.

### Claim 6 (depends on 1)

The sleeve of claim 1, said cylindrical body having an outer diameter greater than the outer diameter of said means to receive a cutting end of a twist drill bit.

### Claim 7 (depends on 1)

The sleeve of claim 1, said cylindrical body having an outer diameter greater than the outer diameter of said means to receive a cutting end of a twist drill bit, said helically-shaped longitudinally extending members having a cross-sectional surface diameter greater than a cross-sectional surface diameter of said cutting ends.

### Claim 8

In combination with a double-ended drill bit, a sleeve for said drill bit comprising:
a cylindrical body having a top end, an opposed end, and a centrally disposed opening therethrough; and,
means to receive a cutting end of a twist drill bit having two flutes, said means being attached to said top end of said cylindrical body, said means to receive said cutting end of a twist drill bit being a pair of flexible helically-shaped longitudinally extending members in spaced mating relation.

### Claim 9 (depends on 8)

The combination of claim 8, said sleeve being of unitary construction.

### Claim 10 (depends on 9)

The combination of claim 9, said sleeve being constructed of a hard plastic material.

### Claim 11 (depends on 8)

The combination of claim 8, said helically-shaped longitudinally extending member having a cross-sectional surface diameter equal to or greater than the cross-sectional surface diameter of said cutting ends.

### Claim 12 (depends on 8)

The combination of claim 8, said twist drill bit having two opposed cutting ends.

### Claim 13 (depends on 8)

The combination of claim 8, said cylindrical body having an outer diameter greater than the outer diameter of said means to receive a cutting end of a twist drill bit.

### Claim 14 (depends on 13)

The combination of claim 13, said means to receive a cutting end of a twist drill bit having a greater diameter than said diameter of said double-ended drill bit.

### Claim 15 (depends on 8)

The combination of claim 8, said cylindrical body having an outer diameter greater than the outer diameter of said means to receive a cutting end of a twist drill bit, said helically-shaped longitudinally extending members having a cross-sectional surface diameter greater than a cross-sectional surface diameter of said cutting ends.