Anti-snag latch assembly for a connector

• US 5,638,474 A
• Filed: 08/30/1995
• Issued: 06/10/1997
• Est. Priority Date: 08/30/1995
• Status: Expired due to Term

• Current Assignee: Furukawa Electric North America Incorporated (Furukawa Electric Company Limited)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Smith, William D., Lampert, Norman R., Shevchuk, George J.
• Primary Examiner(s): NGO, HUNG NHAT
• Application Number:
  US08/520,808
• Time in Patent Office: 650 Days
• Field of Search: 385/76, 385/55, 385/56, 385/60, 385/77, 385/78, 385/139, 385/136
• US Class Current: 385/78
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs
• CPC Class Codes: G02B 6/3879 Linking of individual connector plugs to an overconnector, e.g. using clamps, clips, common housings comprising several individual connector plugs
• CPC Class Codes: G02B 6/38875 Protection from bending or twisting
• CPC Class Codes: G02B 6/3889 using encapsulation for protection, e.g. adhesive, molding or casting resin
• CPC Class Codes: G02B 6/389 characterised by the method of fastening connecting plugs and sockets, e.g. screw- or nut-lock, snap-in, bayonet type
• CPC Class Codes: G02B 6/3893 Push-pull type, e.g. snap-in, push-on
• CPC Class Codes: G02B 6/3897 Connectors fixed to housings, casing, frames or circuit boards G02B6/44528 takes precedence
• CPC Class Codes: H01R 13/6272 comprising a single latching arm
• CPC Class Codes: H01R 24/62 Sliding engagements with one side only, e.g. modular jack coupling devices

Abstract

A connector (10) terminates an optical cable (30) and includes a cylindrical ferrule (140) installed in a plastic base member (150) to form a fiber-holding structure. This structure includes a small passageway along its central axis for holding an optical fiber, and is mounted within a housing (110) that includes a cable-entrance end for receiving the optical cable and a plug end for insertion into a jack receptacle (40). The housing includes a cantilever latch (120) that is mounted on a side surface of the housing and is used to secure the connector to the receptacle. The fixed end (125) of the cantilever latch is positioned toward the plug end of the connector, and the free end (124) of the cantilever latch extends toward the cable-entrance end of the connector. The housing further includes a cantilever trigger (130) which slidably engages the latch to move it downward and thereby release the connector from the receptacle. The fixed end (135) of the trigger is positioned toward the cable-entrance end of the connector and the free end (134) of the cantilever trigger extends toward the plug end of the connector. The trigger forms an acute angle (β) with the central axis (101) of the housing that points in a direction away from the plug end of the connector toward the cable-entrance end so that when the cable is pulled backward through a concentrated area of cables and wires, the trigger prevents the latch from snagging. The novel anti-snagging feature is also incorporated into an RJ-type electrical connector (800).

Claims

1. A connector for terminating a cable containing a transmission medium, the connector having (i) a plug end for insertion into a mating receptacle, (ii) a cable-entrance end for receiving the cable, (iii) a central axis that extends between the plug end and the cable-entrance end, and (iv) a latch for securing the connector to the receptacle;

said latch comprising a cantilever mounted on an outside surface of the connector, the fixed end of the latch being positioned toward the plug end of the connector and the free end of the latch extending toward the cable-entrance end of the connector, said latch being movable toward the central axis

CHARACTERIZED BY;

a trigger for engaging the free end of the latch to release the connector from the receptacle, the trigger comprising a cantilever mounted on the outside surface of the connector, the fixed end of the trigger being positioned toward the cable-entrance end of the connector and the free end of the trigger extending toward the plug end of the connector, the free end of the trigger slidably engaging the free end of the latch to move it toward the central axis, the trigger forming an acute angle β

with the central axis that points in a direction away from the plug end of the connector toward the cable entrance end thereof.

2. The connector of claim 1 wherein the transmission medium comprises an optical fiber.

3. The connector of claim 1 wherein the connector is molded from a thermoplastic material, said fixed ends of the trigger and latch being hinged to the connector by sections of the thermoplastic material which are suitably thin to withstand repeated flexing without breaking.

4. The connector of claim 3 wherein the thermoplastic material includes polycarbonate.

5. A connector for terminating an optical fiber comprising:

a fiber-holding structure for receiving an end portion of the optical fiber in an axial passageway that terminates in an end face;

a housing having internal surfaces that define a cavity and surround the fiber-holding structure, the housing including a first opening for receiving the optical fiber and a second opening for enabling the end face of the holding structure to protrude therethrough, said openings extending into the cavity and being positioned at opposite ends of the housing;

a latch comprising a cantilever having a locking member for securing the housing to an associated receptacle, the latch being mounted on a side surface of the housing with its fixed end toward the second opening of the housing and its free end being movable in a direction toward the axial passageway; and

a trigger comprising a cantilever mounted on the side surface of the housing with its fixed end toward the first opening of the housing and its free end extending toward the second opening of the housing, the free end of the trigger slidably engaging the free end of the latch when moved toward the axial passageway, said trigger forming an acute angle β

with the axial passageway that points in a direction away from the second opening of the connector toward the first opening.

6. The connector of claim 5 wherein the fiber-holding structure includes a spring member which interacts with the housing to urge said end face through the second opening in the housing.

7. The connector of claim 5 wherein the fiber-holding structure comprises

a cylindrical plug that includes the end face in which the associated fiber is to terminate and an axial passageway which terminates in said end face, said passageway being adapted to receive an uncoated end portion of the associated fiber;

and

a base member for holding an end portion of the plug, said base member including an axial passageway which is collinear with the axial passageway of the plug.

8. The connector of claim 6 further including an annular spring which is disposed about the base member and which presses against a flange thereof, said spring also pressing against one of the internal surfaces of the cavity.

9. The connector of claim 5 wherein the housing comprises first and second interlocking members, the first interlocking member being generally U-shaped with a channel for receiving the fiber-carrying structure, the second interlocking member being generally flat and shaped to mate with the first part, said first and second interlocking members substantially enclosing the fiber-holding structure when they are joined together.

10. The connector of claim 5 wherein the first and second interlocking members comprise thermoplastic material.

11. In combination, an optical cable and a connector, the optical cable comprising a glass fiber enclosed within a plastic buffer material;

and the connector comprising (i) a fiber-holding structure having an axial passageway which receives the optical fiber and which terminates in a planar end face that is perpendicular to the passageway, (ii) a housing having internal surfaces that define a cavity and surround the fiber-holding structure, the housing including a first opening at its back end which receives the optical cable and a second opening at its front end that enables the end face of the fiber-holding structure to protrude therethrough, said openings extending into the cavity and being positioned at opposite ends of the housing, (iii) a latch for securing the housing to an associated receptacle to preclude unintended decoupling therebetween, said latch being positioned on a single side surface of the housing and movable in a direction which is perpendicular to the axial passageway, and (iv) a trigger comprising a cantilever mounted on the side surface of the housing with its fixed end toward the first opening of the housing and its free end extending toward the second opening of the housing, the free end of the trigger slidably engaging the free end of the latch when moved toward the axial passageway, said trigger forming an acute angle β

with the axial passageway that points in a direction away from the second opening of the connector toward the first opening.

12. The combination of claim 11 wherein the optical cable further comprises a plurality of filamentary strength members surrounding the buffered fiber and a plastic jacket surrounding the filamentary strength members.

13. The combination of claim 12 further including a strain-relief boot having a central passageway which holds the optical cable, a front portion of the strain-relief boot surrounding the back end of the housing and capturing the filamentary strength members of the optical cable therebetween;

whereby tensile forces applied to the optical cable are transferred to the connector.

14. In combination, a cable joined to a connector,

the cable comprising a transmission medium enclosed within a protective jacket;

and

the connector comprising a housing having a cable-entrance end, a plug end, and a central axis that extends therebetween, said housing including;

(i) a cantilever latch mounted on its outside surface for interlocking with a receptacle, the fixed end of the cantilever latch being positioned toward the plug end of the housing and the free end of the cantilever latch extending toward the cable-entrance end of the housing, and (ii) a cantilever trigger mounted on the outside surface of the housing for deflecting the free end of the latch downward toward the central axis to release the housing from the receptacle;

the fixed end of the cantilever trigger being positioned toward the cable-entrance end of the housing and the free end of the cantilever trigger extending toward the plug end of the housing, the free end of the trigger including a camming surface for slidably engaging the free end of the latch to move it downward, the cantilever trigger forming an acute angle β

with the central axis that points in a direction away from the plug end of the housing toward the cable entrance end.

15. A jumper comprising a communications cable terminated in a plug at each end;

the communications cable including a signal transmission medium enclosed within a dielectric jacket; and

at least one of the plugs comprising a housing having a cable-entrance end, a connecting end, and a central axis that extends therebetween, said housing including;

(i) a cantilever latch mounted on its outside surface for interlocking with a receptacle, the fixed end of the cantilever latch being positioned toward the connecting end of the housing and the free end of the cantilever latch extending toward the cable-entrance end of the housing, and (ii) a cantilever trigger mounted on the outside surface of the housing for deflecting the free end of the latch downward toward the central axis to release the housing from the receptacle;

the fixed end of the cantilever trigger being positioned toward the cable-entrance end of the housing and the free end of the cantilever trigger extending toward the connecting end of the housing, the free end of the trigger including a camming surface for slidably engaging the free end of the latch to move it downward, the cantilever trigger forming an acute angle β

with the central axis that points in a direction away from the connecting end of the housing toward the cable entrance end.

16. The jumper of claim 15 wherein the signal transmission medium comprises a light-carrying fiber.