# US 7,607,877 B1 · Clinch for a circuit card ejector

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- Number: US 7,607,877 B1
- Document ID: US7607877B1
- Status: Granted
- Kind: B1
- Application number: 12/070,767
- Filed: 2008-02-21
- Granted: 2009-10-27
- Earliest claimed: 2008-02-21
- Assignees: Cisco Technology, Inc.
- Inventors: Mandy Lam; Jimmy C. Leung; Toan Nguyen
- Web page: https://patentgrep.com/patent/US7607877B1

## CPC

- H05K 7/1407: {by turn-bolt or screw member}
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A clinch suitable for an ejector of a line card is disclosed. The clinch includes a cylinder, which includes a shoulder flange, an extension portion and a plurality of knurls. The shoulder flange extends radially from a first end of the cylinder, and the extension portion is formed at a second end of the cylinder. The knurls are formed at the second end surrounding the extension portion.

## Claims

### Claim 1

A clinch for an ejector of a circuit card module, comprising:
a cylinder, having a first end and a second end;
a shoulder flange, extending radially from the first end of the cylinder;
an extension portion axially extending from the second end of the cylinder, where the extension portion comprises an undercut groove; and
a plurality of knurls formed at the second end of the cylinder proximate the extension portion.

### Claim 2 (depends on 1)

The clinch of claim 1, wherein the plurality of knurls have a shape that, when installed, restricts rotation of the clinch.

### Claim 3 (depends on 1)

The clinch of claim 1, wherein the plurality of knurls surrounds the extension portion.

### Claim 4 (depends on 1)

The clinch of claim 1, wherein the plurality of knurls comprise gear-shaped structures.

### Claim 5 (depends on 1)

The clinch of claim 1, wherein the plurality of knurls comprise protrusions extending axially from the second end of the cylinder.

### Claim 6 (depends on 1)

The clinch of claim 1, wherein the extension portion has a surface that slopes outwardly along an axial length of the extension portion from the second end of the cylinder.

### Claim 7 (depends on 1)

The clinch of claim 1, wherein the extension portion has a diameter that increases along the axial length of the extension portion from the second end of the cylinder.

### Claim 8

An ejector assembly for a circuit card module, comprising:
a tray defining a first through hole;
a rotary member defining a second through hole; and
a clinch, comprising:
a cylinder, having a first end and a second end;
a shoulder flange, extending radially from the first end of the cylinder;
an extension portion axially extending from the second end of the cylinder, where the extension portion comprises an undercut groove; and
a plurality of knurls formed at the second end of the cylinder proximate the extension portion.

### Claim 9 (depends on 8)

The assembly of claim 8, wherein the rotary member comprises a handle of an ejector of the circuit board module.

### Claim 10 (depends on 8)

The ejector as recited in claim 8, wherein the plurality of knurls surrounds the extension portion.

### Claim 11 (depends on 8)

The ejector as recited in claim 8, wherein the plurality of knurls comprises gear-shaped structure.

### Claim 12 (depends on 8)

The ejector as recited in claim 8, wherein the plurality of knurls comprise protrusions extending axially from the second end of the cylinder.

### Claim 13 (depends on 8)

The ejector of claim 8, wherein the extension portion has a surface that slopes outwardly along an axial length of the extension portion from the second end of the cylinder.

### Claim 14 (depends on 8)

The ejector of claim 8, wherein the extension portion has a diameter that increases along the axial length of the extension portion from the second end of the cylinder.

### Claim 15 (depends on 8)

The ejector of claim 8, further comprising:
an electromagnetic interference gasket disposed between the rotary member and the shoulder flange.

### Claim 16 (depends on 8)

The ejector of claim 8, further comprising:
an electromagnetic interference gasket disposed between the rotary member and the tray.

### Claim 17 (depends on 8)

The ejector of claim 8 wherein the extension of the clinch is press fit into the first through hole.

### Claim 18 (depends on 17)

The ejector of claim 17 wherein the clinch passes through the second through hole to enable the rotary member to rotate about the clinch.

### Claim 19 (depends on 17)

The ejector of claim 17 wherein the force to press fit the extension portion is about 2500 pounds per square inch.

### Claim 20 (depends on 8)

The ejector of claim 8 wherein the shoulder flange maintains the rotary member in position.