US 7,841,775 B2Grant
Connector storage system
Issue Date:2010-11-30
•14 Claims
•9 Drawing Sheets
Abstract
The present invention relates to a fiber optic connector holder sized to fit within an opening for mounting a fiber optic adapter. The fiber optic connector holder is configured to permit a fiber optic connector with a dust cap positioned about a ferrule and a polished end face of an optical fiber held by the ferrule to be inserted within and releasably held by the connector holder. The present invention further relates to a system for holding fiber optic connectors including a fiber optic connector holder mounted within an opening in a bulkhead for mounting a fiber optic adapter. The fiber optic connector holder is configured to receive a fiber optic connector with a dust cap mounted about a ferrule and polished end face of an optical fiber held by the ferrule. The present invention also relates to a method of holding an optical fiber connector to a bulkhead, when the fiber optic connector includes a dust cap mounted about a ferrule and a polished end face of an optical fiber held by the ferrule.
Metadata
Assignee
- ADC Telecommunications, Inc.
Inventors
- Trevor D. Smith
- Thomas C. Tinucci
- Cindy S. Walters
- James W. Conroy
- Joel B. Douglas
- Kathleen M. Barnes
- Marlon E. Holmquist
Application Information
Application Number:US 12/185,504
Filing Date:2008-08-04
Priority Date:2003-06-30
Art Unit:2839
Classifications
IPC:
G02B6/36
Patent Drawings (9 sheets)
Description
Cross Reference to Related Applications
[0001] This application is a continuation of application Ser. No. 11/729,425, filed Mar. 27, 2007, now U.S. Pat. No. 7,407,330, issued Aug. 5. 2008, which is a continuation of application Ser. No. 10/610,325, filed Jun. 30, 2003, now U.S. Pat. No. 7,198,409, issued Apr. 3, 2007, which applications are incorporated herein by reference.
Field of the Invention
[0002] The present invention generally relates to holders for fiber optic connectors and more specifically relates to holders for fiber optic connectors which are protected by dust caps.
Background of the Invention
[0003] Fiber optic connectors include a polished end face, typically held by a ferrule, which permits positioning of the optical fiber held by the connector to receive and transmit signals another optical fiber or optical light source. It is desirable to keep these polished end faces as free of contaminants as possible to improve the transmission of light to and from the optical fiber held by the connector. Such contaminants which might adversely impact the transmission of light to and from the optical fiber include but are not limited to dust and finger prints.
[0004] Dust caps may be provided for connectors to protect the polished end face of the optical fiber. However, when such dust caps are in place, the connector is not capable of being received in known optical fiber adapters, such as those described in U.S. Pat. No. 5,317,663, and U.S. Pat. No. 6,347,888. The disclosures of these patents are incorporated herein by reference. A connector may be inserted into one of these known adapters for storage or pre-wiring of a cross-connection point, an interconnection point or some other type telecommunications switching or connection equipment with the dust cap removed. While the adapters might provide some protection from contaminants to a single connector inserted into an adapter, these adapters are not as effective as a dust cap in protecting the polished end face.
[0005] It is desirable to improve the known methods and apparatus for protecting the polished end face of a fiber optic connector within telecommunications equipment.
Summary of the Invention
[0006] The present invention relates to a fiber optic connector holder sized to fit within an opening for mounting a fiber optic adapter. The fiber optic connector holder is configured to permit a fiber optic connector with a dust cap positioned about a ferrule and a polished end face of an optical fiber held by the ferrule to be inserted within and releasably held by the connector holder.
[0007] The present invention further relates to a system for holding fiber optic connectors including a fiber optic connector holder mounted within an opening in a bulkhead for mounting a fiber optic adapter. The fiber optic connector holder is configured to receive a fiber optic connector with a dust cap mounted about a ferrule and polished end face of an optical fiber held by the ferrule. The connector holder may be removed from the bulkhead and a fiber optic adapter may be mounted within the same opening.
[0008] The present invention also relates to a method of holding an optical fiber connector to a bulkhead, when the fiber optic connector includes a dust cap mounted about a ferrule and a polished end face of an optical fiber held by the ferrule.
Brief Description of the Drawings
[0009] The accompanying drawings, which are incorporated in and constitute a part of the description, illustrate several aspects of the invention and together with the detailed description, serve to explain the principles of the invention. A brief description of the drawings is as follows:
[0010] FIG. 1 is a first perspective view of a fiber optic connector holder according to the present invention.
[0011] FIG. 2 is a second perspective view of the fiber optic connector holder of FIG. 1 .
[0012] FIG. 3 is a top view of the fiber optic connector holder of FIG. 1 .
[0013] FIG. 4 is a bottom view of the fiber optic connector holder of FIG. 1 .
[0014] FIG. 5 is a first end view of the fiber optic connector holder of FIG. 1 .
[0015] FIG. 6 is a side view of the fiber optic connector holder of FIG. 1 .
[0016] FIG. 7 is a second opposite end view of the fiber optic connector holder of FIG. 1 .
[0017] FIG. 8 is a first perspective view of system for holder a fiber optic connector including the fiber optic connector holder of FIG. 1 with a fiber optic connector inserted.
[0018] FIG. 9 is a second perspective view of the system for holding a fiber optic connector of FIG. 8 .
[0019] FIG. 10 is a top view of the system for holding a fiber optic connector of FIG. 8 .
[0020] FIG. 11 is a side view of the system for holding a fiber optic connector of FIG. 8 .
[0021] FIG. 12 is an end view of the system for holding a fiber optic connector of FIG. 8 .
[0022] FIG. 13 is a cross-sectional view of the system for holding a fiber optic connector of FIG. 8 , taken along line A-A in FIG. 11 .
[0023] FIG. 14 is an exploded perspective view of the system for holding a fiber optic connector of FIG. 8 .
[0024] FIG. 15 is a perspective view of the main housing of the fiber optic connector holder of FIG. 1 .
[0025] FIG. 16 is a first perspective view of an inner housing of the fiber optic connector holder of FIG. 1 .
[0026] FIG. 17 is a second perspective view of the inner housing of FIG. 16 .
[0027] FIG. 18 is a top view of the inner housing of FIG. 16 .
[0028] FIG. 19 is a side view of the inner housing of FIG. 16 .
[0029] FIG. 20 is a first end view of the inner housing of FIG. 16 .
[0030] FIG. 21 is a second end view of the inner housing of FIG. 16 .
[0031] FIG. 22 is a first perspective view of the cover of the fiber optic connector holder of FIG. 1 .
[0032] FIG. 23 is a second perspective view of the cover of FIG. 22 .
[0033] FIG. 24 is a top view of the cover of FIG. 22 .
[0034] FIG. 25 is a side view of the cover of FIG. 22 .
[0035] FIG. 26 is a bottom view of the cover of FIG. 22 .
[0036] FIG. 27 is a first end view of the cover of FIG. 22 .
[0037] FIG. 28 is a second end view of the cover of FIG. 22 .
[0038] FIG. 29 is a perspective view of the clip of the fiber optic connector holder of FIG. 1 .
[0039] FIG. 30 is an end view of the clip of FIG. 29 .
[0040] FIG. 31 is a side view of the clip of FIG. 29 .
[0041] FIG. 32 is a bottom view of the clip of FIG. 29 .
[0042] FIG. 33 is a top view of the fiber optic connector holder of FIG. 1 inserted within an opening in a bulkhead.
[0043] FIG. 34 is a perspective view of a bulkhead including a plurality of openings for receiving fiber optic connector adapters and the fiber optic connector holder of FIG. 1 inserted within one of the openings.
[0044] FIG. 35 is a perspective view of the dust cap of the fiber optic connector of FIG. 14 .
[0045] FIG. 36 is a side view of the dust cap of FIG. 35 .
[0046] FIG. 37 is an end view of the dust cap of FIG. 35 .
[0047] FIG. 38 is a cross-sectional view of the dust cap of FIG. 35 .
Detailed Description of the Preferred Embodiment
[0048] Reference will now be made in detail to exemplary aspects of the present invention which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or similar parts.
[0049] Fiber optic cables may be terminated with fiber optic connectors such as connector 100 shown in FIGS. 8 through 14 , below. Optical fiber within these cables may be terminated at a polished end face held by a ferrule 102 in connector 100, as is well known in the art and shown in U.S. Pat. No. 5,317,663, incorporated herein by reference. These polished end faces and ferrules 102 need to be stored and protected until needed for connecting to other fiber optic cables or optical signal equipment.
[0050] Often a dust cap 104 may be placed about ferrule 102 and the polished end face of the optical fiber to protect the polished end face from contamination from dust, fingerprints or other items which might degrade optical signal transmission. While it is known to store these in known optical fiber adapters until the fiber within the attached cable is needed to connect to another fiber optic cable or optical signal equipment, such storage is less than ideal as adapters do not seal the polished end face from contamination as well as dust cap 104 securely fit and held about ferrule 102 of connector 100. Known adapters do not permit insertion of connector 100 which still has dust cap 104 in place about ferrule 102 and the polished end face of the cable.
[0051] Referring now to FIGS. 1 and 2 , connector holder 10 includes a main housing 12 defining an interior cavity 14. An open end 18 permits insertion of a connector 100 into cavity 14 while an opposite opening 16 permits dust cap 104 to protrude from connector holder 10. A clip 20 is positioned about main housing 12 and includes a pair of spring mounting clips 22. A pair of flanges 24 extends from opposing sides 26 of main housing 12 adjacent spring clips 22. Clips 22 and flanges 24 cooperate to releasably mount holder 10 to an opening in a bulkhead as is shown below.
[0052] Main housing 12 also includes a bottom 30 with a keyway 28 to receive a keyed extension of connector 100 to consistently orient connector 100 for insertion into cavity 14. Opposite bottom 30 is an open top closed a cover 32. This is shown in more detail in FIG. 12 , below. FIGS. 3 through 7 provide additional views of connector holder 10.
[0053] Referring now to FIGS. 8 through 13 , connector 10 is shown with connector 100 positioned within cavity 18. Dust cap 104 extends from opening 16 of connector holder 10 while connector 100 is inserted through open end 14.
[0054] Referring now to FIGS. 13 and 14 , connector holder 10 further includes an inner housing 34 with a pair of opposing releasable catches 36 and an opening 38 sized to receive dust cap 104. Inner housing 34 is positioned within main housing 12 through an open top 40 with opening 38 adjacent opening 16 and catches 36 adjacent open end 14. Cover 32 is then positioned within open top 40 and clip 20 placed about cover 32 and main housing 12. Cover 32 may be sealed within open top 40 by gluing, ultrasonic welding or a variety of known fastening techniques. Connector 100 includes a pair of opposing recesses 106 which receive catches 36 when connector 100 is inserted within holder 10.
[0055] As shown, connector 100 and holder 10 are FC style. Connector 100 and holder 10 may conform to other styles and formats of electrical connectors and adapters without straying from the spirit of the present invention.
[0056] Referring now to FIG. 15 , main housing 12 also includes a slot 42 along both sides of cavity 14 to receiving and positioning a flange of inner housing 34 within cavity 14. A recess 44 is provided along sides 26 to receive clip 20. Open top 40 includes a ledge 46 upon which cover 32 is positioned to close cavity 14. An outer bulkhead 68 forms a portion of opening 16. An inner bulkhead 45 is positioned spaced apart from outer bulkhead 68 and these bulkheads cooperate to define slot 42. Between bulkheads 45 and 68 is a positioning surface 43 defining the bottom of slot 42.
[0057] Referring now to FIGS. 16 to 21 , inner housing 34 includes a pair of clip arms 48 extending from a cross piece 50. Opening 38 for receiving dust cap 104 of connector 100 is in cross piece 50. Catches 36 are at the end of clip arms 48 opposite cross piece 50. Cross piece 50 includes a pair of flanges 52 which are received in slots 42 in main housing 12. As shown in FIG. 18 , catches 36 include a ramped portion 54 which is engaged by connector 100 as connector 100 is inserted within cavity 14 through open end 18 of connector holder 10. Clip arms 48 are deflected outward allowing connector 100 to pass between catches 36. When connector 100 is fully inserted within cavity 14 (as shown in FIG. 13 ) catches 36 are received within recesses 106 and a retaining surface 56 of each catch 36 hold connector 100 within cavity 14.
[0058] Inner housing 34 is configured to permit insertion within slots 42 of cavity 14 of main housing 12 in either of two orientations. A pair of edges 66 of cross piece 50 properly position inner housing within cavity 14 with regard to cover 32 and main housing 12 so that opening 38 is aligned to receive dust cap 104.
[0059] Referring now to FIGS. 22 to 28 , cover 32 includes a recess 58 for receiving clip 20 along an outer surface 68. Also in outer surface 68 is a recess 72 for receiving indicia. Along an inner surface 70 are formed a pair of edges 64 configured to be received upon ledges 46 of main housing 12. Extending from inner surface 70 is an outer flange 60 which cooperates with bulkhead 68 within main housing 12 to define opening 16. Also extending from inner surface 70 is a inner flange 62 which is spaced apart from outer flange 60 to form a slot 63. Slot 63 cooperates within slot 42 of main housing 12 to receive flanges 52 of inner housing 34.
[0060] At the top of slot 63 is a positioning surface 61 which cooperates with one of edges 66 of inner housing 34 to position inner housing 34 within cavity 14 so that opening 38 of inner housing 34 is aligned with opening 16. When assembled as connector holder 10, positioning surface 43 of main housing 12 and positioning surface 61 of cover 32 cooperate to engage both edges 66 of inner housing 34. Slot 42 of main housing 12 and slot 63 of cover 32 cooperate to capture flanges 52 of inner housing 34.
[0061] Referring now to FIGS. 29 to 32 , clip 20 includes a cross piece 74 and a pair of opposing sides 76. Spring clips 22 are formed in sides 76. Sides 76 are received within recesses 44 of main housing 12 and cross piece 74 is received within recess 58 of cover 32. It is anticipated that clip 20 will be made of a resilient deformable metal to facilitate insertion and removal from an opening in a bulkhead. Spring clips 22 each include an end 78 and a ramped surface 80.
[0062] FIGS. 33 and 34 shows fiber optic connector holder 10 inserted within an opening 84 in a bulkhead 82. Bulkhead 82 may be part of a piece of telecommunications switching equipment such as a panel for making a plurality of connections between optical fiber cables including a plurality of openings 84 for adapters, as shown in FIG. 34 . Alternatively, bulkhead 82 may include only a single opening 84 where only a single fiber optic connector holder 10 is needed.
[0063] Open end 18 of connector holder 10 is inserted through opening 84 until a pair of sides 86 of opening 84 engage ramped surfaces 80 of spring clips 22. Continued insertion of connector holder 10 will cause bulkhead sides 86 to deflect spring clips 22 inward toward sides 26. Bulkhead sides 86 will eventually pass beyond ends 78 of spring clips 22. Spring clips 22 will then spring back as shown in FIG. 34 , capturing bulkhead sides 86 between ends 78 and flanges 24. Connector holder 10 may be removed from opening 84 by compressing spring clips 22 and removing in a direction opposite the insertion described above.
[0064] Alternatively, flanges 24 may be configured to include a fastener opening so that connector holder 10 can be mounted within opening 84 by removable fasteners.
[0065] It is anticipated that bulkhead should be interpreted broadly enough to include a telecommunications installation where openings 84 for mounting adapters and connector holders are included into sliding adapter packs, such as described in commonly-owned U.S. Pat. No. 5,497,444. The disclosure of this patent is incorporated herein by reference. Bulkhead should also be interpreted broadly enough to include a single opening in a wall or panel, a face plate of a telecommunications module for cross-connecting or interconnecting multiple optical fiber cables, as well as other telecommunications installations where one or more adapters may be mounted within an opening 84.
[0066] Referring now to FIGS. 35 through 38 , dust cap 104 includes a central opening 108 to receive ferrule 102 when ferrule 102 is inserted through open end 110. Opposite open end 110 is closed end 112 which includes knurling 114 to provide better grip for removing dust cap 104. Central opening 108 fits about ferrule 102 to provide a seal about ferrule 102 and to hold dust cap to connector 100. Due to the reduction of air volume within central opening 108 when ferrule 102 is inserted (see FIG. 13 ), one or more helix shaped recesses 116 are provided within central opening 108 along inner walls 118. Recesses 116 extend from adjacent closed end 112 to open end 110. Recesses 116 are small enough prevent entry of unwanted contaminants and still permit air displaced within central opening 108 to be expelled when ferrule 102 is inserted so that dust cap 104 may be fully seat to connector 100. Recesses 116 also allow air to pass into central opening 108 when dust cap 104 is withdrawn from ferrule 102. The shape of each recess 116 is also designed to allow passage of air into and out of central opening 108 when dust cap 104 is removed or placed on ferrule 102 while inhibiting the passage of contaminants along the same path.
[0067] The above specification, examples and data provide a complete description of the manufacture and use of the composition of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.
Claims
The invention claimed is:
1. A connector storage system comprising:
a connector storage housing defining a storage receptacle, the storage receptacle having a connector receiving end;
a fiber optic connector stored within the storage receptacle of the connector storage housing, the fiber optic connector including a ferrule holder having a first end and a second end, the fiber optic connector also including a ferrule positioned at the first end of the ferrule holder, the ferrule having a side surface and an end surface, the ferrule holding an optical fiber having a polished end face positioned at the end surface of the ferrule, the fiber optic connector also including a grip housing mounted over the ferrule holder, wherein at least a portion of the grip housing is positioned within the storage receptacle of the connector storage housing when the fiber optic connector is stored in the connector storage housing; and
a dust cap having an open end positioned opposite from a closed end, the dust cap including an inner surface defining a central opening that extends from the open end to the closed end of the dust cap, the dust cap being mounted on the ferrule of the fiber optic connector with the inner surface of the dust cap engaging the side surface of the ferrule and the closed end of the dust cap opposing the polished end face of the optical fiber, the dust cap being mounted on the ferrule of the fiber optic connector while the fiber optic connector is stored within the connector storage housing.
2. The connector storage system of claim 1, wherein the grip housing includes a key member, and wherein the connector storage housing defines a slot for receiving the key member when the fiber optic connector is stored within the connector storage housing.
3. The connector storage system of claim 1, wherein the connector storage housing includes a main housing and an inner housing positioned within the main housing, the inner housing including a pair of clip arms for retaining the fiber optic connector within the connector storage housing.
4. The connector storage system of claim 3, wherein the main housing includes a rear opening through which the dust cap extends when the fiber optic connector is mounted within the connector storage housing.
5. The connector storage system of claim 3, wherein the connector storage housing includes a retaining clip mounted on the main housing, the retaining clip including a pair of spring clips adapted for engaging an opening in a panel to secure the connector storage housing to the panel.
6. The connector storage system of claim 1, wherein the dust cap defines internal helix shaped recesses.
7. The connector storage system of claim 1, wherein knurling is provided at the closed end of the dust cap.
8. The connector storage system of claim 1, wherein the connector storage housing blocks access to the dust cap when the fiber optic connector is stored within the storage receptacle of the connector storage housing.
9. The connector storage system of claim 1, wherein the grip housing is generally rectangular.
10. The connector storage system of claim 1, wherein the grip housing is slideable relative to the connector body.
11. A connector storage system comprising:
a connector holder defining an interior, the connector holder having at least a portion that deflects when a fiber optic connector is inserted into the interior of the connector holder;
a fiber optic connector stored at the connector holder, the fiber optic connector including a connector body having a first end positioned within the interior of the connector holder, the fiber optic connector also including a ferrule positioned at the first end of the connector body, the ferrule having a side surface and an end surface, the ferrule holding an optical fiber having a polished end face positioned at the end surface of the ferrule; and
a dust cap having an open end positioned opposite from a closed end, the dust cap including an inner surface defining a central opening that extends from the open end to the closed end of the dust cap, the dust cap being mounted on the ferrule of the fiber optic connector with the inner surface of the dust cap engaging the side surface of the ferrule and the closed end of the dust cap opposing the polished end face of the optical fiber, the dust cap being mounted on the ferrule of the fiber optic connector while the fiber optic connector is stored at the connector holder.
12. The connector storage system of claim 11, wherein the fiber optic connector also includes a grip housing mounted over the connector body, and wherein at least a portion of the grip housing is positioned within the interior of the connector holder when the fiber optic connector is stored at the connector holder.
13. The connector storage system of claim 11, wherein the connector holder includes a latch that is configured to secure the connector holder to a panel.
14. The connector storage system of claim 13, wherein the latch is configured to extend through an opening defined by the panel.
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