# US 8,770,862 B2 · Hardened fiber optic connector

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- Number: US 8,770,862 B2
- Document ID: US8770862B2
- Status: Granted
- Kind: B2
- Application number: 12/333,509
- Filed: 2008-12-12
- Published: 2009-06-25
- Granted: 2014-07-08
- Earliest claimed: 2007-01-24
- Assignees: ADC Telecommunications, Inc.
- Applicants: Yu Lu; Randy Reagan
- Inventors: Yu Lu; Randy Reagan
- Web page: https://patentgrep.com/patent/US8770862B2

## CPC

- G02B 6/3879: {Linking of individual connector plugs to an overconnector, e.g. using clamps, clips, common housings comprising several individual connector plugs}
- G02B 6/3816: {for use under water, high pressure connectors (provisionally see G02B6/4428)}
- G02B 6/3821: {with axial spring biasing or loading means (G02B6/3847 takes precedence)}
- G02B 6/3825: {with an intermediate part, e.g. adapter, receptacle, linking two plugs}
- G02B 6/3869: {Mounting ferrules to connector body, i.e. plugs}
- G02B 6/3877: {Split sleeves}
- G02B 6/3887: {Anchoring optical cables to connector housings, e.g. strain relief features}
- G02B 6/3888: {Protection from over-extension or over-compression}
- G02B 6/3893: {Push-pull type, e.g. snap-in, push-on}
- G02B 6/3894: {Screw-lock type}
- G02B 6/3889: {using encapsulation for protection, e.g. adhesive, molding or casting resin}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present disclosure relates to a fiber optic connector for use with a fiber optic adapter. The fiber optic connector includes a connector housing having an end defining a plug portion. A ferrule assembly is mounted at least partially within the connector housing. The ferrule assembly includes a ferrule located at the plug portion of the connector housing. A sealing member is mounted about an exterior of the connector housing for providing a seal between the connector housing and the adapter. The fiber optic connector further includes first and second separate retaining mechanism for retaining the fiber optic connector within the fiber optic adapter.

## Claims

### Claim 1

A fiber optic connector comprising:
a molded, one-piece plug main body defining a central longitudinal axis that extends from a proximal end to a distal end of the plug main body, the plug main body including one or more exterior surfaces defining an exterior boundary of the plug main body that extends around the central longitudinal axis, the plug main body also including one or more interior surfaces defining an interior boundary of the plug main body that extends around the central longitudinal axis, the interior boundary defining a central longitudinal passage that extends through the plug main body along the central longitudinal axis, the exterior boundary of the plug main body defining a groove that extends around the central longitudinal axis, and the interior boundary of the plug main body defining a shoulder facing in a proximal direction;
a cover that attaches to the proximal end of the one-piece plug main body, wherein a strength member of a fiber optic cable can be secured between the cover and the proximal end of the one-piece plug main body;
a ferrule assembly including a ferrule member positioned at least partially within the central longitudinal passage, the ferrule member being aligned along the central longitudinal axis, the ferrule assembly also including a spring that biases the ferrule member in a distal direction, and the ferrule assembly abutting the shoulder of the interior boundary of the plug main body;
an external sealing member mounted within the groove, the external sealing member including at least a portion that extends radially outwardly beyond the exterior boundary of the plug main body, the external sealing member defining a maximum outer cross-dimension less than or equal to 15 millimeters;
an external fastener for securing the plug main body within a fiber optic adapter;
a sleeve positioned over at least a portion of the cover and the proximal end of the one-piece plug main body, the sleeve having a proximal portion positioned proximally with respect to a proximal end of the external fastener and a distal portion positioned distally with respect to the proximal end of the external fastener; and
a heat shrink layer positioned between the sleeve and the fastener.

### Claim 2 (depends on 1)

The fiber optic connector of claim 1, wherein the external sealing member comprises an o-ring and the maximum outer cross-dimension comprises an outer diameter of the o-ring.

### Claim 3 (depends on 1)

The fiber optic connector of claim 1, wherein the maximum outer cross-dimension is less than or equal to 12.5 millimeters.

### Claim 4 (depends on 1)

The fiber optic connector of claim 1, wherein the maximum outer cross-dimension is less than or equal to 10 millimeters.

### Claim 5 (depends on 1)

The fiber optic connector of claim 1, wherein the external fastener comprises a threaded fastener that is rotatably movable relative to the plug main body about the central longitudinal axis.

### Claim 6 (depends on 1)

The fiber optic connector of claim 1, wherein the ferrule member projects distally beyond the distal end of the plug main body and forms a distal-most end of the fiber optic connector.

### Claim 7 (depends on 1)

The fiber optic connector of claim 1, wherein the external sealing member is located at an axial location on the plug main body that is co-extensive with at least a portion of an axial length of the plug main body at which the spring is located.

### Claim 8 (depends on 1)

The fiber optic connector of claim 1, wherein the ferrule member is positioned adjacent the interior boundary of the plug main body.

### Claim 9 (depends on 1)

The fiber optic connector of claim 1, wherein the ferrule assembly can be loaded into the central longitudinal passage through a proximal end of the central longitudinal passage.

### Claim 10 (depends on 1)

The fiber optic connector of claim 1, wherein a portion of the ferrule assembly that abuts the shoulder faces in the distal direction.

### Claim 11 (depends on 1)

The fiber optic connector of claim 1, wherein the plug main body is molded from plastic material.

### Claim 12 (depends on 11)

The fiber optic connector of claim 11, wherein the plug main body has a thickness that extends from the interior boundary to the exterior boundary, at least a portion of the plastic material being uninterrupted as the plastic material extends outwardly through the thickness from the interior boundary to the exterior boundary of the plug main body.

### Claim 13 (depends on 1)

The fiber optic connector of claim 1, wherein the ferrule assembly abuts the shoulder defined by the interior boundary to stop movement of the ferrule assembly in the distal direction.

### Claim 14 (depends on 1)

The fiber optic connector of claim 1, wherein the ferrule assembly further includes a spring holder that captures the spring when the ferrule assembly is loaded into the central longitudinal passage.

### Claim 15 (depends on 14)

The fiber optic connector of claim 14, wherein the spring holder is positioned between the cover and the proximal end of the one-piece plug main body.