JP2006119231A - Optical plug socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical plug socket that makes an optical fiber cable usable for a pull-in line from outdoors and to improve installation workability by connecting different kinds of plugs with each other, when the optical fiber cable is connected with a plug smaller than those used for indoor communication equipment. <P>SOLUTION: The optical plug socket is composed of a body 1 which is embedded and installed in a building structure by using an installing frame for an embedded wiring tool and a cover 2 which is pivotally attached in a manner freely opened/closed inside an opening 1a prepared in the front of the body 1. In the back of the cover 2, there is attached an adaptor 3 for holding a first and a second plug in a manner optically coupled, wherein the first plug is installed at the tip end of the optical fiber cable from communication equipment on the indoor side of the building structure, and wherein the second plug is smaller than the first plug and installed at the tip end of other optical fiber cable wired in the building structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical outlet for connecting an optical fiber cable having an optical connector at the tip.

  Conventionally, along with the spread of information transmission by optical communication using optical fiber cable, it is connected to the optical fiber cable pre-wired on the back side of the wall or under the floor that constitutes the construction structure and indoor communication equipment There has been provided an optical outlet for connecting to another optical fiber cable that has been made (see, for example, Patent Document 1).

The optical outlet shown in Patent Document 1 includes a body embedded in a construction structure such as a wall, and an adapter in which a plug provided at the tip of an optical fiber cable is detachably connected to the inside of the body. The optical fiber cables are optically connected to each other by connecting the fiber optic cables wired in advance on the back side of the construction structure and the fiber optic cables connected to the indoor communication equipment to the adapters. It comes to be combined.
JP-A-1-297604

  By the way, when the optical fiber cable is pre-wired on the back side of the construction structure, the distance to the optical outlet varies depending on the construction site, so the optical fiber cable is cut to the desired length at the construction site and the plug is connected to the tip There was a need to do.

  However, when cutting the optical fiber cable at the construction site and connecting the plug to the tip of the optical fiber cable, cut the optical fiber cable with a dedicated cutter so that irregular reflection does not occur on the cut surface when cutting the optical fiber cable. It is necessary to connect the plug using a dedicated tool, and an expensive dedicated tool has to be prepared, and the construction work is difficult and requires skill.

  By the way, in recent years, by providing holes around the core and confining light by the quantum optical effect, an optical fiber cable with less optical loss has been developed even with a smaller bending radius than before, and such an optical fiber cable has been developed. There is provided an optical curl cord which is processed into a spiral shape (curled shape) and has a plug connected in advance to its tip. If this optical curl cord is used as the leading wiring, the optical curl cord is extended to the mounting position of the optical outlet, and the plug at the tip of the optical curl cord is connected to the adapter of the optical outlet, the optical fiber cable at the construction site Although it is considered that cutting work and plug connection work are not required, the optical curled cord has a smaller outer diameter than the generally used SC-type plug, considering that it passes through narrow pipes. Is connected to the tip of the optical curl cord. On the other hand, in the optical connector shown in Patent Document 1 described above, plugs of the same type are connected via an adapter, so different types of plugs cannot be connected, and such an optical curl cord is used. There was a problem that it was not possible to cope with the preceding wiring using.

  The present invention has been made in view of the above-described problems, and its object is to connect plugs of different types to each other so that the plug is smaller than the plug used in indoor communication equipment. It is an object of the present invention to provide an optical outlet with improved workability by using an optical fiber cable connected to the outside as a lead-in wire from outside.

  In order to achieve the above object, the invention of claim 1 is a first plug provided at the tip of an optical fiber cable from a communication facility on the indoor side of the construction structure, and smaller than the first plug. An adapter that holds the second plug provided at the tip of another optical fiber cable wired to the construction structure in an optically coupled state, and holds the adapter and is installed in the construction structure. It is characterized by comprising an outlet body.

  According to a second aspect of the present invention, in the first aspect of the present invention, the other optical fiber cable includes an optical curl cord in which the optical fiber is formed in a spiral shape and has elasticity, and is hooked and locked with the optical curl cord. A tension stopper is provided in the outlet body.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the outlet body is formed of a substantially box-shaped case that is exposed on the indoor side of the construction structure, and the case is other than a mounting surface to the construction structure. In the above-mentioned side face, the present invention is characterized by having knock-outs for passing lines at a plurality of positions including at least both side positions in a direction substantially parallel to the mounting surface.

  By the way, the first plug that has been used in indoor communication equipment has a large external dimension and is difficult to pass through the narrow space on the back side of the construction structure, so the optical fiber cable is pre-wired and cut to the desired length. After that, the work of connecting the plug to the tip of the optical fiber cable was performed. However, according to the invention of claim 1, the adapter held in the outlet body is connected to the optical fiber cable from the indoor communication equipment. Since the first plug provided and the second plug provided in another optical fiber cable that is smaller than the first plug and wired to the construction structure are held in an optically coupled state, An optical fiber cable pre-installed with a small second plug can be introduced from the outside and connected to the adapter. The optical fiber cable can be cut at the construction site or the plug can be connected. Since the work is not required, it is not necessary to prepare an expensive special tools, and since work requires skill disappears, the effect of improving the workability of the construction work.

  According to the invention of claim 2, since the optical curl cord is used for the optical fiber cable wired to the construction structure, the optical curl cord is extended according to the distance to the optical outlet and connected to the adapter. The work of cutting the optical fiber cable to a desired length or connecting the plug at the construction site becomes unnecessary, and the workability is improved. In addition, since the optical curl cord contracts after the optical curl cord is connected, the extra length processing of the optical fiber cable becomes unnecessary, the workability is further improved, and the optical curl cord is hooked and locked to the tension stopper. Thus, since the tension applied to the adapter can be received by the tension stopper, the second plug can be prevented from coming off from the adapter.

  According to the invention of claim 3, since the side surface of the case other than the mounting surface to the construction structure is provided with knockouts for wiring at a plurality of positions including at least both side positions in a direction substantially parallel to the mounting surface. When installing the case in the corner of the room, when installing the case with the left side of the case close to the pillar or wall, install the knockout on the left side with the right side of the case close to the column or wall. In this case, by introducing the optical fiber cable using the right knockout, the optical fiber cable can be routed as close to the corner of the room as possible, and the appearance of the wiring can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
Embodiment 1 of this invention is demonstrated based on FIGS. In the description of the first embodiment, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG. 3A, and the front in FIG. Therefore, the left end in FIG.

  As shown in FIGS. 1, 2, and 7, the optical outlet A of the present embodiment is embedded in a construction material using a mounting frame 8 standardized by JIS for embedded wiring devices. A body 1 and an outlet body comprising a cover 2 pivotably mounted in an opening 1a provided in the front surface of the body 1, an adapter 3 attached to the back side of the cover 2, and an adapter 3 covering the adapter 2 And a tension stopper 5 which is attached to the back side of the body 1 and tensions the optical fiber cable.

  The body 1 is a synthetic resin molding in which the left and right and upper and lower sides are surrounded by peripheral walls 11a, 11a, 11b, and 11c, the upper half is opened in the front-rear direction, and the back 11d is integrally formed in the lower half. Steps 11e and 11e are formed on the front side portions of the left and right peripheral walls 11a and 11a so that the width dimension on the front end side is narrower than the width dimension on the rear end side. A pair of to-be-latched claws 12a for engaging with a locking portion 88a of a synthetic resin mounting frame 8 described later are integrally formed at the upper and lower positions of the outer edge of each step portion 11e. In addition, on the outer surface of the front peripheral wall 11a, two engagement holes 12b are formed on both upper and lower sides to be engaged with engagement claws of a metal attachment frame (not shown).

  Further, a bearing portion 13 that rotatably supports the mandrel 28 is formed on the front surface portion of the upper peripheral wall 11b so as to protrude forward (see FIGS. 1 and 6), and the adapter 3 is provided on the rear side portion of the peripheral wall 11b. A U-shaped notch 11f for inserting a plug (not shown) to be connected is formed. On the other hand, a protruding portion 14 is bulged and formed on both the left and right sides of the front end portion of the lower peripheral wall 11c, and a flexible piece is formed between the protruding portions 14 and 14 so as to extend forward from the lower end of the back portion 11d. The push button 15 provided at the front portion of 15a is interposed, and the operation surface of the push button 15 and the front surfaces of the projecting portions 14 and 14 have substantially the same height. Further, at the boundary between the push button 15 and the flexible piece 15a, a locking protrusion 20a protruding from the center of the lower end of the cover 2 and a locking protrusion 45 of the presser fitting 4 are releasably locked. A locking hole 15b is provided.

  Further, a rectangular cylindrical support portion 17 is formed so as to protrude from the back side of the back portion 11d, and slits are formed on the left and right side walls of the support portion 17 to provide flexibility in the thickness direction. An elastic locking piece 18 is formed. Each elastic locking piece 18 protrudes rearward from the rear end of the support portion 17, and a locking claw 18 a protrudes outward from the front end.

  The cover 2 is a synthetic resin molded body, and includes a rectangular plate-shaped front surface portion 20, substantially fan-shaped side portions 21, 21 extending rearward from both sides of the front surface 20, and under the side portions 21, 21. Leg pieces 22, 22 projecting rearward from the rear edge of the side part, mounting part 23 formed between the lower sides of the side parts 21, 21, and projecting upward from the left and right sides of the upper end part of the front part 20 The shaft holding portions 24 and 24 are integrally provided.

  Here, a storage portion for storing and holding the adapter 3 is constituted by a space surrounded by the back side of the front portion 20, the side portions 21 and 21, and the attachment portion 23, and the attachment portion 23 is opposed to the adapter 3. Thus, a plug insertion port 23a into which an SC-type plug provided at the tip of the optical fiber cable from the communication equipment on the indoor side of the construction structure is inserted is opened (see FIG. 5 (d) and FIG. 6). . The plug insertion opening 23a is closed by a pair of protective doors 25, 25 arranged in the front and rear directions so as to be freely opened and closed, and the protective doors 25, 25 prevent leakage of laser light to the outside.

  Further, the shaft holding portions 24, 24 are substantially columnar and are arranged side by side so that the axial direction is substantially parallel to the left-right direction, and shafts that support both ends of the mandrel 28 at the center of each shaft holding portion 24. A hole 24a is formed through. Thus, the spring body 29 is housed in the bearing concave portion 13 a of the bearing portion 13 of the body 1, and the bearing portion 13 of the body 1 is interposed between the shaft holding portions 24, 24. By inserting a mandrel 28 through the shaft hole 24 a, the bearing recess 13 a of the bearing portion 13, and the shaft hole 24 a of the other shaft holding portion 24, the upper end portion of the cover 2 is pivotally supported with respect to the body 1. The lower end side of the cover 2 is always urged forward by the spring body 29. The spring body 29 is formed by bending a central portion 29a into a U-shape and forming twisted portions 29b and 29b at both ends.

  In addition, on the back surface of the front surface portion 20, three support ribs 26 that respectively contact the front surface of the adapter 3 are formed to protrude between the side portions 21 and 21 in parallel with the side portion 21. Is formed in a shape such that the upward protrusion amount increases toward the upper side. Further, from the rear end portions of the leg pieces 22 of the cover 2, engaging claws 22 a that abut on the projections 11 g that project from the inner side surfaces of the left and right peripheral walls 11 a of the body 1 are projected outward. Further, each leg piece 22 is provided with an insertion hole 22b through which a screw 27 for fixing the presser fitting 4 is inserted.

  On the other hand, the adapter 3 includes a rectangular tube-shaped plug connecting portion 31 to which a plug (first plug) of an F04 type (so-called SC type) optical fiber connector (see JIS C 5973) is connected, and the plug connecting portion 31 A housing 30 provided with a rectangular tube-like plug connection portion 32 extending from one end side and connected to a plug (second plug) of an F14 type (so-called MU type) optical fiber connector (see JIS C 5983). The flanges 33, 33 protrude laterally from the left and right side surfaces on one end side of the plug connection portion 31. Then, the ferrule of the SC type plug connected to the plug connection part 31 and the ferrule of the MU type plug connected to the plug connection part 32 are held in the housing 30 in an aligned state, and both ferrules are held. A conventionally known sleeve (not shown) for optical connection is mounted. In this sleeve, the optical fibers are brought into close contact with each other by connecting both ferrules with PC (Physical Contact), and optically connected with low loss. In other words, the adapter 3 has a function of holding an SC-type plug generally used in indoor communication equipment and an optically coupled MU-type plug that is smaller than the SC type. The general-purpose SC-type plug connected to the optical fiber cable from the communication facility on the indoor side of the construction structure is connected to the plug connection portion 31 through the plug insertion port 23a, and the construction structure is drawn from the outside. A small MU-type plug connected to the optical fiber cable wired in advance on the back side of the plug can be connected to the plug connection portion 32.

  The presser fitting 4 is formed by punching and bending a sheet metal, and is formed from a rectangular plate-shaped contact piece 40 that contacts the rear surface of the housing 30 of the adapter 3, and from the left and right side edges at the bottom of the contact piece 40. Support pieces 41, 41 projecting toward the bottom, inclined pieces 42 projecting obliquely downward from the center of the lower edge of the contact piece 40, and protection projecting forward from the left and right side edges of the upper part of the contact piece 40. The plates 43 and 43 are integrally formed. A screw hole 44 into which the screw 27 is screwed is formed at an intermediate portion of each support piece 41, and its front end portion faces the rear surface of the rear end portion of the leg piece 22 of the cover 2 (that is, the back side portion of the engaging claw 22 a). It is formed to extend to the position. At the center of the lower edge of the inclined piece 42, a locking protrusion 45 that locks with the locking hole 15b of the flexible piece 15a protrudes downward.

  The tension stopper 5 is a synthetic resin molded body, and is formed to extend from the upper edge of the main portion 51 so as to protrude upward from a substantially rectangular plate-shaped main portion 51 with rounded left and right corners on the lower side. A curved guide portion 52 is integrally provided. The upper portion of the main portion 51 is provided with three hooking projections 53, which are cylindrical tension stoppers protruding rearward in the left-right direction, and the lower half of the circumferential surface of the rear end portion of each hooking projection 53. A substantially semi-circular tongue piece 53a protrudes downward. Further, projecting pieces 54a and 54b that contact the inner surfaces of the upper and lower side walls of the support portion 17 of the body 1 are formed at a substantially middle portion of the front surface of the main portion 51, and a bridge is formed between the projecting pieces 54a and 54b. Three reinforcing ribs 54c that are entangled are formed along the vertical direction, and through holes 55, 55 that penetrate the main portion 51 in the thickness direction at portions corresponding to the elastic locking pieces 18, 18 of the body 1. Is formed.

  By the way, the above-mentioned body 1 is equivalent to three wiring appliances of unit dimensions (one module size) that can be arranged in parallel on a mounting frame 8 for a large-angle continuous wiring appliance standardized by JIS or the like. (3 module dimensions) and can be embedded in the construction structure using the mounting frame 8. As shown in FIG. 7, the mounting frame 8 is formed in a rectangular frame shape having a vertically long window hole 81 from a synthetic resin, and is attached to a not-shown embedding box on the side pieces 82 and 82 facing in the longitudinal direction. Are provided with at least a long hole 84 for a box screw and a screw insertion hole 85 used for directly fixing the screw to the wall surface. Further, of the side pieces 83a and 83b facing in the short width direction, one set of two side holes 83a has three sets of locking holes (not shown) in the longitudinal direction at substantially constant intervals. A bending piece 86 is provided to extend rearward from the rear edge of the other side piece 83b. The flexible piece 86 is formed with three openings 87 arranged in the longitudinal direction, and projecting pieces 88 project forward from the rear ends of the openings 87.

  Thus, the cover 2 attached to the front surface of the body 1 from the rear side of the mounting frame 8 is inserted into the window hole 81, and the locked claw 12a on one side of the body 1 is used as the locking hole on the side piece 83a. After the insertion, the opposite side of the body 1 is pushed forward so that the bent piece 86 is bent outward by the opposite claw 12a and placed on the locking portion 88a formed of the shoulder of the protruding piece 88. The body 1 can be attached to the attachment frame 8 by being inserted into the opening 87. A decorative plate 9 is attached to the front surface of the mounting frame 8 using locking claws, screws, or the like. The decorative plate 9 covers the mounting holes and the mounting frame 8 provided in the construction material. The front portion of the optical outlet A is exposed to the outside through the opening window 9a.

  Next, the assembly of the optical outlet A of this embodiment will be described.

  First, the adapter 3 is inserted into the housing portion surrounded by the front surface portion 20 and the side portions 21 and 21 of the cover 2 with the orientation of the housing 30, and the support ribs 26 protruding from the rear surface of the front surface portion 20 are attached to the housing 30. Make contact with the front. In this state, the contact piece 40 of the presser fitting 4 is brought into contact with the rear surface of the housing 30, and the support piece 41 of the presser fitting 4 is brought into contact with the inner side surface of each leg piece 22. The presser fitting 4 is fixed to the cover 2 by screwing the screw 27 passed through 22 b into the screw hole 44 of the support piece 41, and the adapter 3 is sandwiched between the presser fitting 4 and the cover 2. At this time, since the front end portion of each support piece 41 is arranged on the back side portion of the portion where the engaging claw 22a of each leg piece 22 is projected, the force that presses the side portions 21 and 21 inward is applied to the metal. It can be received by the support pieces 41, 41 of the presser fitting 4 made of material.

  Next, when the cover 2 is assembled to the body 1, the center piece of the center portion 29 a of the spring body 29 is locked to the lower surface side of the bearing portion 13 of the body 1, and the recesses formed at both ends of the bearing recess 13 a (see FIG. (Not shown), the twisted portions 29b, 29b at both ends of the spring body 29 are fitted, and both ends of the bearing recess 13a and the through holes of the twisted portions 29b, 29b are communicated. And the cover 2 is arrange | positioned in the front side of the body 1 so that the bearing part 13 may be interposed between the shaft holding parts 24 and 24 of the cover 2, the shaft hole 24a of one shaft holding part 24, and one twist part 29b. The mandrel 28 is inserted into the through hole, the bearing recess 13a of the bearing part 13, the through hole of the other twisted part 29b, and the shaft hole 24a of the other shaft holding part 24. The mandrel 28 can be inserted by setting the diameter from one end on the insertion side to near the other end to be slightly smaller than the inner diameter of the shaft hole 24a and the bearing recess 13a. And the outer surface is knurled, and the other end 28a is finally press-fitted into the shaft hole 24a so that the mandrel 28 is fixed to the body 1. Is done.

  At this time, the extended portions 29c and 29c extended from the twisted portions 29b and 29b of the spring body 29 are brought into elastic contact with the back surface of the front surface portion 20 of the cover 2, so that the cover 2 is moved in the forward direction (clockwise rotation in FIG. 6). Urging force to rotate in the direction) is applied. In other words, the cover 2 is pivotally supported with its upper end pivotable about the mandrel 28 with respect to the body 1, and the spring body 29 has an urging force that the lower end pivots forward from the front surface of the body 1. Is given.

  Thereafter, the tension stopper 5 is brought close to the back portion 11 d of the body 1 from the rear, and the elastic locking pieces 18 and 18 of the body 1 are inserted into the through holes 55 and 55 of the tension stopper 5, so that the back surface of the main portion 51. The tension stopper 5 is attached to the body 1 by projecting to the side and hooking and locking the locking claw 18 a at the tip of each elastic locking piece 18 to the hole edge of the through hole 55.

  As described above, the adapter 3 is attached to the cover 2, the cover 2 is attached to the body 1, and the tension stopper 5 is attached to the back side of the body 1 to complete the assembly of the optical outlet A. 3 and 6 (a), the cover 2 is rotated counterclockwise in FIG. 6 against the urging force of the spring body 29, and the locking protrusion 20a at the lower end of the cover 2 is elastically applied to the flexible piece 15a. The cover 2 is shown in a state of being locked in the locking hole 15b. At this time, the cover 2 has the front surface of the front surface portion 20 substantially the same height as the front surface of the body 1 (the front surface of the protruding portion 14 and the push button 15). The adapter 3 that is held in this state and attached to the back side of the front surface portion 20 is stored in the body 1 (this state is a non-use state).

  When the push button 15 exposed on the front surface of the body 1 is pushed downward in this non-use state, the front portion of the flexible piece 15a bends downward, and the tip of the locking protrusion 20a becomes the locking hole. 15b, the cover 2 receives the biasing force of the spring body 29 and rotates clockwise around the mandrel 28 in FIG. When the lower end portion of the cover 2 rotates forward, the engaging claws 22a provided on both leg pieces 22 of the cover 2 are engaged with the rear ends of the ribs 16 provided on the inner side surfaces of the left and right peripheral walls 11a of the body 1. Thus, the forward rotation of the cover 2 is restricted, and the front portion 20 protrudes forward from the front portion of the body 1 so as to incline downward from the upper end portion to the lower end portion. And the front portion of the body 1 are exposed to the plug insertion port 23a. This protruding state is a use state in which plug connection is performed. In this state, the locking protrusions 45 of the presser fitting 4 attached to the cover 2 are engaged with the locking holes 15b of the flexible piece 15a, and the locking protrusions 45 are inserted. Is locked to the rear edge of the locking hole 15b, so that the rearward rotation of the cover 2 is restricted, and the cover 2 is kept protruding forward (FIGS. 5, 6B and 8). reference).

  In this state of use, when an SC-type plug connected to the tip of the optical fiber cable from the indoor communication equipment is inserted into the plug insertion port 23a, the protective doors 25, 25 are opened by the plug, and the plug connection portion 31 is opened. An SC-type plug is connected to. At this time, the MU-type plug connected to the plug connection portion 32 of the adapter 3 and the SC-type plug connected to the plug connection portion 31 are PC-connected, and the two optical fiber cables are optically coupled. Is done.

  Further, after the connected SC plug is removed, when the push button 15 is pushed downward in this state and the front portion of the flexible piece 15a is bent downward, the locking protrusion 45 of the holding metal fitting 4 is obtained. Is detached from the locking hole 15b. Then, with the locking protrusion 45 and the locking hole 15b unlocked, the lower side portion of the cover 2 is pushed backward (the front side of the body 1) against the biasing force of the spring body 29. When the mandrel 28 is rotated counterclockwise in FIG. 6, the cover 2 is accommodated in the opening 1 a of the body 1. At this time, the locking projection piece 20a at the lower end of the cover 2 is locked to the locking hole 15b using the elastic force of the flexible piece 15a, so that the front surface of the front surface portion 20 of the cover 2 is connected to the front surface of the body 1. The adapter 3 attached to the back of the front surface portion 20 is in the storage state in which the adapter 3 is stored in the body 1. Here, a pop-up mechanism for popping up the cover 2 and the adapter 3 is constituted by the spring body 29 and the flexible piece 15 a having the push button 15.

  Next, the optical outlet A of the present embodiment is a mounting hole comprising an embedded box (not shown) embedded in the wall so as to open to the indoor side of a wall such as a wall panel or a concrete wall constituting the construction structure. The construction to be disposed in will be described.

  First, by pulling the tension stopper 5 attached to the back portion 11d of the body 1 to the rear side, the locking state between the locking claw 18a and the through hole 55 is released, and the tension stopper 5 is removed from the body 1. Then, the front surface portion 20a of the cover 2 is fitted into the window hole 81 of the mounting frame 8 from the back, and one of the locked claws 12a of the body 1 is inserted into the locking hole of the side piece 83a. The body 1 is attached to the attachment frame 8 by inserting the to-be-latched claw 12a into the locking portion 88a of the side piece 83b.

  Next, it is pre-wired inside the construction structure (in the case of wall panels, in the back wall of the wall panel, in the case of concrete walls, in the concrete wall) and introduced into the embedding box embedded in the wall. A plug (not shown) connected to the tip of the optical fiber cable B is inserted into the body 1 through a notch 11f provided in the upper peripheral wall 11b of the body 1, and the plug connection of the adapter 3 held by the cover 2 is connected. It is inserted into the part 32 and connected to the adapter 3.

  After the plug connected to the tip of the optical fiber cable B is connected to the adapter 3, the tension stopper 5 is attached to the back of the body 1, and the optical fiber cable B drawn obliquely upward from the body 1 is attached to the tension stopper 5. Are wired downward along the guide portion 52, wound halfway around one of the hooking projections 53 and led out upward (see FIG. 9). At this time, the optical fiber cable B is hooked on the tongue 53a projecting on the lower circumferential surface of the hooking protrusion 53, so that the optical fiber cable B can be prevented from falling off. Then, after the adapter 3 is mounted, the back of the optical outlet A is housed in the embedded box, and is screwed to the embedded box using the long holes 84 provided in the upper and lower side pieces 82 of the mounting frame 8 and attached. The decorative plate 9 is attached to the front side of the frame 8 with locking claws, screws, or the like, and the front portion of the optical outlet A is exposed to the outside through the opening window 9a of the decorative plate 9 to complete the construction.

  Here, since the distance to the optical outlet A differs from site to site in the past, it was necessary to cut the optical fiber cable B that was pre-wired at the construction site and connect the plug to its tip. In order to perform cutting work and plug connection work, an expensive dedicated tool has to be prepared, and there is a problem that the work requires skill. Therefore, it is desired to form an optical fiber in a spiral shape so that it has elasticity, and an optical curl cord having a plug connected in advance to its tip is used for the preceding wiring. When used, the optical curl cord is stretched to match the distance to the installation position of the optical outlet A, so that the work of cutting the optical fiber cable B and the connection of the connector at the construction site are not required. Since the optical curl cord is contracted later, the extra length processing of the optical fiber cable B becomes unnecessary. Here, since the optical curl cord may pass through a narrow pipe such as when used for preceding wiring, the plug connected to the tip is smaller than the SC type plug used in indoor communication equipment. In the optical outlet A of the present embodiment, the adapter 3 has a function of optically coupling different types of plugs, and is used for an optical fiber cable from indoor communication equipment. Since the connected SC-type plug and the MU-type plug connected to the optical fiber cable wired to the construction structure are held in an optically coupled state, the preceding wiring has a MU-type plug. Optical curl cords with pre-connected plugs can be used, eliminating the need to prepare expensive dedicated tools by eliminating the work of cutting optical fiber cables and connecting plugs at the construction site. It, and because no even work requires skill, it was possible to improve the workability of the construction work.

  In addition, since the optical curl cord shrinks according to the distance to the optical outlet after the construction, the extra length processing of the optical fiber cable becomes unnecessary, the workability is further improved, and the optical curl cord is attached to the guide portion 52. After the wiring is lined downward, it is wound around the hooking protrusion 53 by a half turn and then led upward, so that the tension applied to the optical fiber cable B can be received by the hooking protrusion 53, so that the tip of the optical fiber cable B It is possible to prevent the plug provided on the adapter 3 from being removed from the adapter 3.

  Note that the optical fiber cable B may be wound around the hooking protrusion 53 and then led out to the upper side, so that the effect of tension stop can be further enhanced. Further, since three hooking projections 53 are formed in the left and right direction on the upper portion of the main portion 51 of the tension stopper 5, the optimum hooking projection 53 is provided in accordance with the mounting position of the wiring duct to the embedding box. The optical fiber cable B can be wound by being selected. It should be noted that dimensions such as the radius of the hooking projection 53, the radius of curvature of the guide portion 52, and the distance from the guide portion 52 to the hooking projection 53 can be used regardless of the direction in which the optical fiber cable B is wound. The dimensions are set such that the bending radius of the cable B is not less than the minimum allowable bending radius. Further, the form of the tension stopper is not limited to the above, and the shape is not limited as long as the tension stop can be performed by hooking and locking the optical fiber cable B.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. In the description of the second embodiment, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG. 11A, and the front in FIG. Therefore, the left end in FIG.

  The optical outlet A ′ of the present embodiment is a dew-type outlet that is exposed on the indoor surface of the wall constituting the construction structure, and holds the adapter 3 and the adapter 3 and is installed in the construction structure. A synthetic resin body 6 and a synthetic resin cover 7 attached to the body 6 so as to cover the adapter 3 are provided as main components, and the body 6 and the cover 7 are substantially box-shaped cases. Is configured.

  The adapter 3 has the same configuration as that described in the first embodiment, and an SC-type plug generally used in indoor communication equipment and a MU-type plug that is smaller than the SC type. Are held in an optically coupled state. That is, the adapter 3 connects a general-purpose SC-type plug connected to an optical fiber cable from a communication facility on the indoor side of the construction structure to the plug connection portion 31 through a plug insertion port 62b described later, and is drawn from the outside. Thus, a small MU-type plug connected to the optical fiber cable exposed on the surface of the construction structure using a molding or the like can be connected to the plug connection portion 32 through a knockout 67 described later.

  The cover 7 has a vertically long main portion 71 disposed opposite to the front surface of the body 6, and a peripheral portion 72 integrally extends rearward from the three sides on the upper side and the left and right sides of the main portion 71. The rear surface and the lower surface are formed in a substantially box shape. A substantially lower half of the main portion 71 bulges forward, and a plurality of ridges 73 projecting toward the body 6 are arranged side by side in the left-right direction on the back surface of the lower portion. Further, a locking piece 74 protrudes inward (center direction in the left-right direction) from the rear edge of the peripheral portion 72 on both the left and right sides, and a locking projection 74a is formed at the lower end portion of the front surface of each locking piece 74. Is protruding.

  On the other hand, the body 6 has a vertically long rectangular plate-shaped main portion 61, and a vertical wall 62 projecting forward from the lower side of the main portion 61 is integrally provided, and the three sides excluding the lower side. A side portion 61a having a smaller protruding amount than the vertical wall 62 extends forward. A pair of screw insertion holes 69, 69 are provided substantially at the center in the vertical direction of the main portion 61, and a fixing screw (not shown) such as a tapping screw is inserted into the screw insertion hole 69 to construct a construction structure The body 6 can be screwed to the construction structure by being screwed into a wall panel or the like constituting the. In addition, the lower half of the left and right side portions 61a is formed wider than the upper half, and protrudes forward from the inner edges of the wide portions 61b and 61b (the side close to the central portion in the left-right direction of the body 6). The guide walls 68 and 68 are integrally extended, and locking pieces 68a and 68a project from the front edge of the lower side of each guide wall 68 and 68 toward the outside.

  Thus, when the cover 7 is attached to the body 6, if the cover 7 is slid from the upper side to the lower side to cover the main part 61 of the body 6, the engagement provided on the peripheral portions 72 on both the left and right sides of the cover 7. When the stop piece 74 is inserted between the main portion 61 of the body 6 and the locking piece 68a and the cover 7 is slid to a position where the lower edge of the cover 7 contacts the peripheral portion of the vertical wall 62, The locking projection 74a of the piece 74 gets over the projection 68b provided on the rear surface of the locking piece 68a, and the locking projection 74a is locked with the projection 68b, so that the cover 7 is prevented from coming off. At this time, the lower end portion of the protrusion 73 of the cover 7 abuts against the vertical wall 62, so that the downward movement of the cover 7 is restricted, and the locking piece 74 of the cover 7 is connected to the guide wall 68 of the body 6. And the movement to the front-back direction and the left-right direction of the cover 7 is controlled by contact | abutting with the locking piece 68a. When removing the cover 7, if the cover 7 is slid upward, the engagement state between the engagement protrusion 7 a and the protrusion 68 b is released, so that the cover 7 can be easily removed from the body 6.

  In addition, on the substantially lower half of the front surface of the main portion 61, three protrusions 63 are formed along the longitudinal direction to contact the rear surface of the adapter 3, and both left and right sides sandwiching the three protrusions 63 A pair of guide pieces 64a and 64a for guiding the left and right side surfaces of the plug connection portion 32 and a pair of guide pieces 64b and 64b for guiding the left and right side surfaces of the plug connection portion 31 are provided so as to protrude vertically. Has been. The gap between the guide pieces 64a and 64b becomes a groove 65 into which the flange 33 of the adapter 3 is fitted, and the front end portion of the lower guide piece 64b and 64b is hooked and locked to the corner on the front side of the plug connecting portion 32. Claws 64c and 64c that project are projected.

  Thus, when the adapter 3 is oriented so that the flange 3 of the adapter 3 is inserted into the groove 65 so that the adapter 3 is brought close to the main portion 61, the left and right side surfaces of the plug connecting portions 31 and 32 are respectively The guide pieces 64 a and 64 b come into contact with each other, and the adapter 3 is attached to the body 6 by the hook 64 c of the guide piece 64 b being hooked and engaged with the corner of the plug connection portion 32. Here, the vertical wall 62 is opposed to the plug connecting portion 32, and an SC-type plug provided at the tip of the optical fiber cable from the communication equipment on the indoor side of the construction structure is provided at the approximate center of the vertical wall 62. The plug insertion port 62a into which is inserted is opened. The plug insertion port 62a is closed by the protective doors 62b and 62b so as to be freely opened and closed, and the leakage of laser light to the outside is prevented by the protective doors 62b and 62b. When removing the adapter 3, the adapter 3 can be easily removed from the body 6 by pushing the tip of the guide piece 64 b outward to release the claw 64 c.

  In addition, three rectangular hole insertion holes 66 penetrating the main part 61 in the front-rear direction are arranged in the upper part of the main part 61 side by side in the left-right direction. By forming the left and right end portions thinly at the portion of the side portion 61a desired for each insertion hole 66, a knockout 67 is formed at a portion between the thin portions 67a and 67a. The thin portions 67a and 67a are By cutting the knockout 67 by cutting with a cutter, nipper or the like, an insertion port for the optical fiber cable can be easily formed. That is, a total of three knockouts 67 are formed on the side portion 61a on the upper side of the body 6 (side surface other than the attachment surface to the construction structure) at both the left and right side portions and the central portion.

  In constructing the optical outlet A ′ having the above configuration on the wall constituting the construction structure, first, a fixing screw such as a tapping screw is inserted into the insertion holes 69 and 69 of the body 6 to construct the construction structure (for example, The body 6 is fixed to the construction structure by screwing into a wall made of gypsum board. Next, an optical fiber cable drawn from outside is exposed on the surface of the construction structure (wall), and a MU-type plug (second plug) connected in advance to the tip of the optical fiber cable is connected to the adapter 3. To the plug connection section 32 of FIG. Thereafter, in order to introduce the optical fiber cable into the case, the thin-walled portions 67a and 67a of any knockout 67 are cut with a cutter or a nipper, and the optical fiber cable is passed through the insertion port formed by cutting out the knockout 67. In this state, the plug connecting portion 32 is inserted between the guide pieces 64a and 64a so that the flange 33 of the adapter 3 fits in the groove 65, and the plug connecting portion 31 is inserted between the guide pieces 64b and 64b. The adapter 3 is held by the body 6 by hooking and engaging the claw 64c of the guide piece 64b with the corner on the front surface side of the connecting portion 31. Then, when the cover 7 is slid from the upper side to the lower side to cover the main portion 61 of the body 6, the locking piece 74 of the cover 7 is inserted between the main portion 61 of the body 6 and the locking piece 68a, When the cover 7 is slid to a position where the lower edge of the cover 7 comes into contact with the peripheral portion of the vertical wall 62, the locking protrusion 74a of the locking piece 74 is locked with the protrusion 68b of the locking piece 68a. 7 is attached to the body 6.

  In this assembled state, the plug connection portion 31 of the adapter 3 is disposed opposite to the plug insertion port 62a of the vertical wall 62, and the SC-type plug connected to the tip of the optical fiber cable from the indoor communication equipment is plugged. When inserted into the opening 62 a, the protective doors 62 b and 62 b are opened by the plug, and the SC-type plug is connected to the plug connecting portion 31. At this time, the SC-type plug and the MU-type plug are PC-connected by the adapter 3 and the two optical fiber cables are optically coupled.

  Here, the adapter 3 has a function of optically coupling different types of plugs (SC type and MU type), and connects a MU type plug that is smaller than the generally used SC type plug. Therefore, it is possible to use a MU-type plug that is connected in advance to the tip of an optical fiber cable that is drawn from the outside, and the wiring space required to draw the wiring can be reduced.

  Moreover, in the side part 61a (side surface other than the attachment surface to the construction structure) of the body 6 constituting the outlet body (case), a plurality of positions including at least both side positions in a direction substantially parallel to the attachment surface (this embodiment) In this case, since the knockout 67 is formed at the center and the left and right sides), when installing the case of the optical outlet A ′ at the corner of the room as shown in FIG. 13, the case as shown in FIG. When the optical fiber cable B is inserted from the insertion port formed except for the right-end knockout 67, the right-side surface is connected from the other knockout 67. Compared to the case, the optical fiber cable B can be routed closer to the corner of the room, and the appearance of the wiring can be improved. Also, when installing the case with the left side of the case close to the column 100c at the left end of the mounting surface 100a as shown in FIG. 5B, the optical fiber cable B is inserted from the insertion port formed except for the knockout 67 at the left end. In this case, the optical fiber cable B can be routed closer to the corner of the room, and the appearance of the wiring can be improved as compared with the case of entering from another knockout 67. Also, when installing the case near the center of the room wall, if the optical fiber cable is inserted from the insertion port made except for the knockout 67 at the center, the optical fiber cable should be inserted at the approximate center in the left-right direction of the case. Can improve the appearance of the wiring.

  As described above, the body 6 constituting the outlet main body (case) is connected to a plurality of positions including at least both side positions in a direction substantially parallel to the mounting surface on the side surface other than the mounting surface to the construction structure. Since the knockout 67 is provided, the knockout 67 suitable for the installation location can be selected and used, and there is an advantage that the workability of wiring is improved. When the optical fiber cable is introduced into the outlet main body through a hole drilled in a wall or the like constituting the construction structure, the body 6 is constructed so that the hole drilled in the wall and the insertion hole 66 communicate with each other. What is necessary is just to introduce | transduce an optical fiber cable into an outlet main body through the hole drilled in the wall and the insertion hole 66, fixing to a structure.

It is the disassembled perspective view which looked at the optical outlet socket of Embodiment 1 from the front. It is the disassembled perspective view which looked at the same from back. The cover is shown closed, (a) is a front view, (b) is a left side view, (c) is a top view, and (d) is a bottom view. It is a rear view same as the above. The cover is opened, (a) is a front view, (b) is a left side view, (c) is a top view, and (d) is a bottom view. FIG. 2A is a cross-sectional view showing a state where the cover is closed, and FIG. 3B is a cross-sectional view showing a state where the cover is opened. It is a disassembled perspective view explaining the state before construction same as the above. It is an external appearance perspective view of the state which opened the cover same as the above. It is the external appearance perspective view which looked at the same from back. It is a disassembled perspective view of the optical outlet socket of Embodiment 2. FIG. 4A is a front view, FIG. 4B is a left side view, FIG. 3C is a cross-sectional view taken along the line CC, FIG. 3D is a top view, and FIG. It is a front view of a body same as the above. (A) (b) is explanatory drawing of the construction state same as the above.

Explanation of symbols

A Optical outlet 1 Body 1a Opening 2 Cover 3 Adapter

Claims (3)

  A first plug provided at the tip of an optical fiber cable from a communication facility on the indoor side of the construction structure, and other light that is smaller than the first plug and wired to the construction structure An adapter that holds the second plug provided at the tip of the fiber cable in an optically coupled state, and an outlet body that holds the adapter and is installed in the construction structure. A light outlet.   The other optical fiber cable is formed of an optical curl cord having an optical fiber formed in a spiral shape and having elasticity, and a tension stop portion that hooks and engages with the optical curl cord is provided in the outlet body. The optical outlet according to claim 1.   The outlet body includes a substantially box-shaped case that is exposed on the indoor side of the construction structure, and the case includes both sides in a direction substantially parallel to the attachment surface on a side surface other than the attachment surface to the construction structure. The optical outlet according to claim 1 or 2, further comprising a knockout for passing through at a plurality of positions including at least the position.

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