This application claims the benefit of Chinese Patent Application No. 201410287048.5 filed on Jun. 24, 2014 in the State Intellectual Property Office of China, the whole disclosure of which is incorporated herein by reference.
Field of the Invention
The present invention relates to a fiber optic connector, a towing assembly, a method for producing a fiber optic connector and a field assembling method of a fiber optic connector.
Description of the Related Art
In the prior art, when a fiber optic connector is required to pass through an elongated pipe, two methods are usually employed, a first method is to sleeve a towing member on a housing of the fiber optic connector and a towing rope is connected to the towing member so as to tow the fiber optic connector through the elongated pipe; a second method is to fasten the towing rope onto the fiber optic connector directly so as to tow the fiber optic connector through the elongated pipe.
With regard to the first method, it is necessary to use a dedicated tool to assemble the towing member onto the fiber optic connector, thus, generally, the towing member is directly assembled onto the fiber optic connector in factory and is sold with the fiber optic connector. Also it is necessary to use a dedicated tool to remove the towing member from the fiber optic connector after the fiber optic connector passes through the elongated pipe, thus, it is not convenient to perform such towing operation and the cost is high.
With regard to the second method, it is simple, but the ferrule assembly of the fiber optic connector is exposed directly in the pipe and is easy to be damaged by contaminants in the pipe and thus a quality of the fiber optic connector is affected.
There is also a common issue both in the above methods, that is, the fiber optic connector cannot pass through a narrow elongated pipe when the housing of the fiber optic connector has a large size. In order to solve this issue, the inventor has proposed a new technical solution, in which the housing of the fiber optic connector is removed before passing through the elongated pipe, and a ferrule assembly is towed through the pipe, then the ferrule assembly is mounted into the housing.
However, in the prior art, all of a plurality of positioning keys on the ferrule assembly and a plurality of corresponding positioning slots in the housing are spaced at an equal angle, so that the ferrule assembly may be inserted into the housing in multiple different manners. In order to ensure the ferrule assembly is inserted into the housing in a correct orientation (an eccentric orientation of an optical fiber in the ferrule assembly points toward an upper portion of the housing in a vertical direction when the ferrule assembly is inserted into the housing in a correct orientation), it is required to identify an eccentric orientation label on the ferrule assembly and to locate it at a vertically upward orientation. However, in the field environment, a field operator is apt to neglect this issue and insert the ferrule assembly into the housing in an incorrect orientation, which causes the eccentric orientation of an optical fiber in the ferrule assembly is not located in a predetermined orientation of the housing, increasing an insertion loss when two fiber optic connectors are mated.
An objective of the present invention aims to solve at least one aspect of the above issues and disadvantages in the prior art.
According to embodiments of the present invention, there is to provide a fiber optic connector, which is adapted to be assembled and detached in the field and prevents effectively the ferrule assembly of the fiber optic connector from being inserting into the housing thereof in an incorrect orientation angle.
According to an aspect of the present invention, provided is a fiber optic connector comprising: a housing; a housing; and an integrated ferrule assembly adapted to be inserted into or pulled out of the housing in a manner of a single piece. N positioning keys are formed on an outer periphery of a ferrule tail seat of the ferrule assembly, wherein N is an integer equal to or greater than two, the N positioning keys are spaced each other at an equal angle around the outer periphery of the ferrule tail seat, and one of the N positioning keys corresponding to an eccentric orientation of an optical fiber fixed in the ferrule assembly is cut off to form a cutting portion; (N−1) positioning slots, which correspond to (N−1) positioning keys on the ferrule tail seat respectively, are formed in the housing, and there is no positioning slots formed in a part of the housing corresponding to the cutting portion, such that the integrated ferrule assembly is allowed to be inserted into the housing only when the (N−1) positioning keys are aligned with the (N−1) positioning slots, respectively.
According to an exemplary embodiment of the present invention, the integrated ferrule assembly comprises a ferrule body, a ferrule tail seat, a spring, a spring seat, a crimp ring, a shrinkable tube, a boot, an optical cable and a dust cap which are assembled into a single piece.
According to another exemplary embodiment of the present invention, the ferrule tail seat is connected to a rear end of the ferrule body; the spring is held in a receiving chamber at a front end of the spring seat, and a rear end of the ferrule tail seat is inserted into the receiving chamber and presses against the spring; a reinforcing element of the optical cable is pressed against a rear end of the spring seat by the crimp ring, and the optic fiber of the optic cable passes through an inner hole of the ferrule and is secured in the inner hole of the ferrule by glue; one end of the shrinkable tube is thermally shrunk on the crimp ring and the other end thereof is thermally shrunk on the optical cable; the boot is sleeved on the shrinkable tube and is connected to the spring seat; and the dust cap is sleeved on a front end of ferrule body.
According to another exemplary embodiment of the present invention, the part of the housing corresponding to the cutting portion is located at an upper portion of the housing in a vertical direction.
According to another exemplary embodiment of the present invention, the housing comprises an outer housing and an inner housing mounted in the outer housing; the positioning slots are formed in the inner housing, and the integrated ferrule assembly is inserted into the inner housing.
According to another exemplary embodiment of the present invention, an outer surface at the rear end of the spring seat is formed as a coarse surface.
According to another exemplary embodiment of the present invention, a protrusion is formed on the rear end of the ferrule tail seat and an opening is formed in a wall of the receiving chamber of the spring seat, and the protrusion of the ferrule tail seat is engaged into the opening of the spring seat.
According to another exemplary embodiment of the present invention, an elongated slot is also formed in the wall of the receiving chamber of the spring seat in order to separate the wall of the receiving chamber in its circumferential direction.
According to another aspect of the present invention, provided is a towing assembly comprising: an integrated ferrule assembly comprising a ferrule body, a ferrule tail seat, a spring, a spring seat, a crimp ring, a shrinkable tube, a boot, an optical cable and a dust cap which are assembled into one part with each other; and a towing portion sleeved hermetically on the spring seat of the integrated ferrule assembly. Internal threads are formed on an inner wall of the towing portion and external threads are formed on an outer wall of the spring seat, and the towing portion is threaded to the spring seat. A groove is formed on the outer wall of the spring seat and an elastic seal ring is disposed in the groove, the inner wall of the towing portion presses against the elastic seal ring when the towing portion is sleeved on the spring seat, so that a fitting interface between the towing portion and the integrated ferrule assembly is sealed; and N positioning keys are formed on an outer periphery of the ferrule tail seat, wherein N is an integer equal to or greater than two, the N positioning keys are spaced at an equal angle around the outer periphery of the ferrule tail seat, and one of the N positioning keys corresponding to an eccentric orientation of an optical fiber secured in the ferrule is cut off to form a cutting portion.
According to an embodiment of the present invention, one end of the towing portion is provided with a connecting lug for connecting a towing cable.
According to another exemplary embodiment of the present invention, the ferrule tail seat is connected to a rear end of the ferrule body; the spring is held in a receiving chamber at a front end of the spring seat, and a rear end of the ferrule tail seat is inserted into the receiving chamber and presses against the spring; a reinforcing element of the optical cable is pressed against a rear end of the spring seat by the crimp ring, and the optic fiber of the optic cable passes through an inner hole of the ferrule and is secured in the inner hole of the ferrule by glue; one end of the shrinkable tube is thermally shrunk on the crimp ring and the other end thereof is thermally shrunk on the optical cable; the boot is sleeved on the shrinkable tube and is connected to the spring seat; and the dust cap is sleeved on a front end of ferrule body.
According to another exemplary embodiment of the present invention, an outer surface at the rear end of the spring seat is formed as a coarse surface.
According to another exemplary embodiment of the present invention, a protrusion is formed on the rear end of the ferrule tail seat, an opening is formed in a wall of the receiving chamber of the spring seat, and the protrusion of the ferrule tail seat is assembled into the opening of the spring seat.
According to another exemplary embodiment of the present invention, an elongated slot is also formed in the wall of the receiving chamber of the spring seat in order to separate the wall of the receiving chamber in its circumferential direction.
According to another aspect of the present invention, provided is a method for producing the fiber optic connector of any one of above embodiments, comprising steps of:
According to another aspect of the present invention, provided is a field assembling method of a fiber optic connector comprising steps of:
According to an exemplary embodiment of the present invention, internal threads are formed on an inner wall of the towing portion and external threads are formed on an outer wall of the spring seat of the integrated ferrule assembly, and the towing portion is threaded to the spring seat; a groove is formed on the outer wall of the spring seat and an elastic seal ring is disposed in the groove, the inner wall of the towing portion presses against the elastic seal ring when the towing portion is sleeved on the spring seat, so that a fitting interface between the towing portion and the integrated ferrule assembly is sealed.
The fiber optic connector of the present invention is adapted to be assembled and detached in the field, preventing effectively the ferrule assembly of the fiber optic connector from being inserting into the housing thereof in a wrong orientation angle.
Other objectives and advantages of the present invention will become more apparent by describing the present invention with reference to the accompanying drawings in the following, it may also aid to give a complete comprehension of the present invention.
The technical solutions of the present invention are further explained specifically in the following by embodiments and in combination with accompanying drawings. The same or similar reference numbers indicate the same or similar parts in the description. The following explanation of the embodiments of the present invention with reference to the drawings intends to explain the general inventive concept of the present invention, but cannot be interpreted as a limitation to the present invention.
Moreover, in the following detailed description, for the purpose of explanation, a number of specific details are explained in order to provide a complete comprehension to the disclosed embodiments. However, it is obvious that one or more embodiments may be implemented without these specific details. In other cases, well known structures and devices are embodied in a form of illustration to simplify the drawings.
According to a general technical concept of the present invention, provided is a fiber optic connector comprising: a housing; and an integrated ferrule assembly adapted to be inserted into or pulled out of the housing in a manner of a single piece. N positioning keys are formed on an outer periphery of a ferrule tail seat of the ferrule assembly, wherein N is an integer equal to or greater than two, the N positioning keys are spaced each other at an equal angle around the outer periphery of the ferrule tail seat, and one of the N positioning keys corresponding to an eccentric orientation of an optical fiber fixed in the ferrule assembly is cut off to form a cutting portion. (N−1) positioning slots, which correspond to (N−1) positioning keys on the ferrule tail seat respectively, are formed in the housing, and there is no positioning slots formed in a part of the housing corresponding to the cutting portion, such that the integrated ferrule assembly is allowed to be inserted into the housing only when the (N−1) positioning keys are aligned with the (N−1) positioning slots, respectively.
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In the illustrated embodiment, four positioning keys 121, 122, 123, 124 are firstly formed on the ferrule tail seat 120, then one positioning key 124 corresponding to the eccentric orientation of the optical fiber 141 is cut off, and only three positioning slots 211, 212, 213, which correspond to the left three positioning keys 121, 122, 123, respectively, are formed in the inner housing 210.
However, the present invention is not limited to the illustrated embodiment. In another exemplary embodiment of the present invention, N positioning keys are formed on an outer periphery of the ferrule tail seat 120 of the ferrule assembly, wherein N is an integer equal to or greater than two, the N positioning keys are arranged to be spaced at an equal angle (360/N degrees) around the outer periphery of the ferrule tail seat 120, and one of the N positioning keys corresponding to the eccentric orientation of the optical fiber 141 fixed in the ferrule is cut off to form the cutting portion. (N−1) positioning slots, which correspond to (N−1) positioning keys formed on the ferrule tail seat 120, respectively, are formed in the housing 200, and there is no positioning slot is not formed in a part of the housing 200 corresponding to the cutting portion, such that the integrated ferrule assembly 100 is allowed to be inserted into the housing 200 only when the (N−1) positioning keys are aligned with the N−1 positioning slots, respectively.
In an exemplary embodiment of the present invention, the part 214a of the housing 200 corresponding to the cutting portion 124a is located at an upper portion of the housing in a vertical direction. Thus, when coupling two fiber optic connectors using an adapter, it is only required to set the eccentric orientations of the two fiber optic connectors to a straight upward orientation so as to reduce an eccentric amount between optical fibers held in the two coupled fiber optic connectors and to reduce an insertion loss when coupling the two fiber optic connectors.
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Though the present invention is described in combination with the accompanying drawings, the disclosed embodiments with reference to the drawings intend to make an exemplary illustration to the implementations of the present invention, but cannot be interpreted as a limitation to the present invention.
Though some embodiments of the general inventive concept have been shown and explained, it should be understood by those skilled in the art that these embodiments may be modified without departing from the principle and spirit of the general inventive concept, and the scope of the present invention is defined by the claims and equivalents thereof.
It should be noted that, the term “comprising” or “comprise” should be understood as not excluding other elements or steps, the word “a” or “an” should be understood as not excluding plural of said elements or steps. In addition, any reference number in the claims should not be understood as limiting the scope of the present invention.
Number | Date | Country | Kind |
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201410287048.5 | Jun 2014 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/IB2015/054593 | 6/18/2015 | WO | 00 |