JP4270255B2 - Optical fiber outlet - Google Patents

Description

  The present invention relates to an optical fiber outlet installed in a form exposed on a construction surface such as a wall surface.

Conventionally, as an optical fiber outlet attached to a construction surface such as a wall or a floor, there has been one disclosed in Patent Document 1, for example. This optical fiber outlet is mounted on the front of the body and the front of the body so as to be able to protrude forward of the body. An optical fiber receptacle that is attached to the cover so that the plug connection port faces the outside of the body when the cover protrudes forward, and an urging means that constantly urges the cover in a direction that protrudes toward the front of the body. It comprises holding means for holding the state in which the optical fiber receptacle is accommodated, and comprises a pop-up mechanism for projecting the cover forward of the body when the holding means is released.
JP 2005-70340 A

  However, in the above conventional example, the optical fiber cable inserted into the case from the outside of the case and attached to the optical fiber receptacle (female side optical connector) can move freely inside the case consisting of the body and the cover. If an external force is applied, such as pulling the optical fiber cable or hooking a leg, the optical fiber cable may be bent beyond the allowable bending radius, causing a tensile force to be applied and disconnecting from the female optical connector. was there.

  The present invention has been made in view of the above points, and provides an optical fiber outlet in which the optical fiber cable does not come off the female optical connector even when an external force such as pulling the optical fiber cable is applied. With the goal.

In order to achieve the above object, the female optical connector in which the male optical connector can be inserted and removed is brought into contact with the respective opening surfaces of the body and the cover, each of which has a box body with one open surface. This is an optical fiber outlet housed in a box-shaped case that is configured in such a way that the body is fixed in such a way that one side faces the construction surface such as a wall surface, and guides the optical fiber cable from the outside to the inside of the case The cover has a cable insertion hole, and the cover is provided with a protrusion that fits into the cable insertion hole of the body when the cover is attached to the body. The body and the cover are optical fiber cables in the vicinity of the cable insertion hole inside the case. a cable fixing means for fixing a radius below predetermined bending radius bending is allowed in the thickness direction of the case the female optical connector Each comprise a fixing part for a constant, the body and the cover, the inner wall and the protrusion of the cable insertion hole for holding the optical fiber cable as a cable fastening means, and with each other has a step between the cable insertion hole in the thickness direction Auxiliary ribs standing in the facing direction and sandwiching the optical fiber cable, and cable fixing ribs standing in the mutually facing direction and sandwiching the optical fiber cable between the auxiliary rib and the cable insertion hole and the protrusion are provided. And a plurality of ridges standing in a direction facing each other as a fixing portion and sandwiching the female optical connector, and a surface of the rib for fixing the cable abutting on the optical fiber cable has a predetermined bending radius. It is formed with the curvature which becomes.

  According to the present invention, since the optical fiber cable is fixed at a predetermined bending radius in the vicinity of the cable insertion hole inside the case, it is possible to improve the tensile strength in the pulling direction of the optical fiber cable, and therefore from the outside such as pulling the optical fiber cable. Therefore, it is possible to prevent the optical fiber cable from being detached from the female optical connector.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, in the longitudinal direction of the body 4, the front side in FIG. 4 is the front direction and the back side is the rear direction, and in the short direction of the body 4, the front side in FIG. The vertical direction in FIG. 4 is defined as the vertical direction.

  As shown in FIG. 1, the optical fiber outlet of the present embodiment accommodates in a case 3 an optical receptacle 2 that is a female optical connector into which an optical plug (not shown) that is a male optical connector can be inserted and removed. Configured. The case 3 is formed in a substantially rectangular parallelepiped shape from a synthetic resin material, and is fixed to the construction surface such as a wall surface so that the lower surface is opposed to the body 4, and the optical receptacle 2 is mounted on the upper surface side, The cover 5 is detachably coupled to the body 4 so as to cover the upper surface side of the optical receptacle 2.

  The optical plug and the optical receptacle 2 constitute, for example, an SC type optical connector (F04 type single-core optical fiber connector defined by JISC5973), and have a push-on type fastening structure with a slide lock structure. Since the optical plug is well known and does not relate to the gist of the present invention, detailed description is omitted here.

  The optical receptacle 2 is configured by housing a ferrule, a sleeve, a split sleeve and the like (not shown) in a substantially rectangular parallelepiped housing 20. The housing 20 is formed so that the outer peripheral surface on the front side protrudes from the outer peripheral surface on the rear side, and an opening 21 through which an optical plug can be inserted and removed is provided on the front surface of the housing 20. The rear surface of the housing 20 is provided with a cable connection port 22 through which a plug 1a attached to the tip of the optical fiber cable 1 can be inserted and removed. By inserting the plug 1a into the cable connection port 22, an optical plug and an optical plug are connected. (See FIG. 1). In this embodiment, in order to connect the optical fiber cable 1 to the optical receptacle 2, the plug 1a attached to the tip of the optical fiber cable 1 is attached to the optical receptacle 2 in consideration of workability. A female optical connector including 1a is configured. A substantially rectangular parallelepiped outer skin gripping portion 6 that covers the rear portion of the plug 1a and the outer sheath of the optical fiber cable 1 is attached to the plug 1a, and a connecting portion between the optical fiber cable 1 and the plug 1a is fixed. Further, flanges 23 that protrude outward are provided on both the left and right sides of the rear surface of the outer surface on the front side of the housing 20.

  As shown in FIG. 3A, the body 4 is formed in a box having an upper surface opened, a front wall 40 protruding upward is projected on the front surface, and a rectangular opening is formed in the center of the front wall 40. A window 40a is provided. A mounting portion 41 to which the optical receptacle 2 is mounted is formed in front of the body 4, and a flat plate-shaped main piece 43 a that protrudes upward is formed on the left and right sides of the front of the mounting portion 41 in the short direction of the body 4. A total of four hook-shaped locking pieces 43 each including a locking protrusion 43b protruding from the upper end edge of the main piece 43a toward the inside of the body 4 are formed. The optical receptacle 2 is mounted on the mounting portion 41 by sliding and fitting the flanges 43 of the optical receptacle 2 from above between the locking pieces 43 and locking the housing 20 by the locking protrusions 43b. (See FIG. 2 (a)). The optical receptacle 2 is mounted so that an optical plug can be inserted into and removed from the opening 21 of the optical receptacle 2 through the opening window 40a of the body 4 (see FIG. 2B). A substantially rectangular cable insertion hole 9 through which the optical fiber cable 1 from the outside is guided into the case 3 is provided at substantially the center of the rear surface of the body 4.

  Further, boss portions 42 are formed on both the left and right sides of the mounting portion 41, respectively, and attachment holes 42 a penetrating the body 4 in the vertical direction are formed in each boss portion 42. The body 4 is fixed to the construction surface by screwing a screw (not shown) into a construction surface (not shown) such as a wooden wall through the mounting hole 42a. When the construction surface is made of steel (for example, when attached to an office desk or the like), a magnet (not shown) that is detachably attached to the back surface of the body 4 may be magnetically attached to the construction surface.

  As shown in FIG. 3B, the cover 5 is formed in a box having an open bottom surface, and covers the top surface side of the body 4 with the optical receptacle 2 attached thereto. An opening 50 is provided in the peripheral wall on the front surface side of the cover 5 over the entire length in the short direction, and the cable insertion hole of the body 4 in the state where the cover 5 is attached to the body 4 in the peripheral wall on the rear surface side of the cover 5. A protrusion 51 that fits into the protrusion 9 protrudes downward.

  Next, the coupling structure of the body 4 and the cover 5 in this embodiment will be described. As shown in FIG. 3 (a), the portions near the front wall 40 at both ends along the longitudinal direction of the body 4 are opposed to the adherend surface (upper surface) covered by the cover 5 with a certain distance therebetween, and Rail portions 44 extending substantially parallel to the longitudinal direction of the body 4 are provided so as to protrude upward. The rail portion 44 is formed in a bowl shape having a flat plate-like main piece 44a protruding upward and an engaging protrusion 44b protruding from the upper end edge of the main piece 44a toward the outside of the body 4.

  On the other hand, when the cover 5 is slid in the longitudinal direction along the upper surface of the body 4, it engages with the engagement protrusions 44 b of the rail portion 44 on the inner side surfaces of both ends along the longitudinal direction of the cover 5. Engagement pieces 52 are respectively provided.

  Therefore, the engagement piece 52 does not overlap the engagement protrusion 44b, and the cover 4 is put on the upper surface of the body 4 so as to approach the front wall 40 of the body 4 (hereinafter referred to as “mounting direction”). When the cover 5 is slid, the engagement piece 52 and the engagement protrusion 44b engage with each other so that the cover 5 can be attached to the body 4 and coupled to each other (see FIG. 4). In order to remove the cover 5 from the body 4, the cover 5 is slid in the direction opposite to the mounting direction to release the engagement state between the engagement piece 52 and the engagement projection piece 44b. 4 can be removed.

  Locking means for preventing the cover 5 from being detached from the upper surface of the body 4 along the vertical and horizontal directions of the case 3 is locked while the cover 5 is slid and attached to the upper surface of the body 4. 4 and cover 5. The locking means includes a pair of locking projections 53 provided on the cover 5 and a pair of locking projections that are provided on the body 4 and that are individually fitted to the locking projections 53 when the cover 5 is slid. And a fitting portion 45.

  The locking projection 53 projects from the peripheral wall on the rear surface side of the cover 5 so as to project inward in the longitudinal direction. The lock fitting portion 45 is in contact with the rear surface of the body 4 and protrudes upward, and a lock fitting hole 45 a that opens outward in the longitudinal direction of the body 4 is formed.

  Thus, when the cover 5 is slid and moved in the mounting direction with the top surface of the body 4 being covered, the lock protrusion 53 of the cover 5 is formed in the lock fitting portion 45 of the body 4. Since it engages with 45a, the coupling strength between the body 4 and the cover 5 is increased.

  As shown in FIG. 2 (a), the abutting portions 8 that are substantially U-shaped in plan view are provided on the rear side of the boss portions 42 of the body 4 so as to protrude upward. The outer skin gripping part 6 is clamped in the left-right direction by sandwiching the outer skin gripping part 6 with the optical receptacle 2 attached.

  Further, as shown in FIG. 2B, the body 4 has a fixing portion 7 composed of a plurality of protrusions (three in the drawing) provided along the longitudinal direction of the body 4. As shown in FIG. 3B, fixing portions 7 each formed of a plurality of protrusions (two in the drawing) provided along the longitudinal direction of the cover 5 are formed. These protrusions are provided at equal intervals in the left-right direction, and are formed in a stepped shape. Specifically, in the state where the body 4 and the cover 5 are joined, the protrusions of the fixing portion 7 of the body 4 are the front portion of the lower surface of the rear portion of the housing 20 of the optical receptacle 2 and the rear portion of the outer skin gripping portion 6. The protrusion of the fixing portion 7 of the cover 5 is formed so as to abut the lower surface, and the front portion is in the state where the body 4 and the cover 5 are coupled, and the front portion is the upper surface of the front portion of the housing 20 of the optical receptacle 2 and the central portion. Are formed such that the upper surface of the rear portion of the housing 20 of the optical receptacle 2 and the rear portion thereof are in contact with the upper surface of the outer skin gripping portion 6. Therefore, the optical receptacle 2 and the outer skin gripping portion 6 are held in contact with each other in the vertical direction, and the optical receptacle 2 and the outer skin gripping portion 6 are fixed in the vertical direction.

  Hereinafter, cable fixing means for fixing the optical fiber cable 1 in the present embodiment with a predetermined bending radius will be described. As shown in FIG. 1, cable fixing ribs 10 and 11 are erected on the rear side of the body 4 and the cover 5 so as to face each other. As shown in FIG. 3A, the cable fixing rib 10 of the body 4 protrudes upward from the lower surface of the body 4 in the vicinity of the cable insertion hole 9, and the upper end surface of the rib 4 is fixed to the cable insertion hole 9. It has a curved surface shape that inclines smoothly upward from the lower edge of the head. As shown in FIG. 3B, the cable fixing rib 11 of the cover 5 protrudes downward from the upper surface in the vicinity of the protrusion 51, and its lower end surface is forward of the lower end edge of the protrusion 51. The curved surface is smoothly inclined upward as it goes to. A substantially rectangular auxiliary rib 10 a is integrally formed at the front ends of the cable fixing ribs 10, 11, and the width in the left-right direction is substantially equal to the diameter of the optical fiber cable 1.

  As shown in FIG. 1, the cable fixing ribs 10 and 11 and the auxiliary ribs 10 a and 11 a are connected to the upper ends of the cable fixing rib 10 and the auxiliary rib 10 a and the cable in the state where the cover 5 is attached to the body 4. When the fixing rib 11 and the lower end surface of the auxiliary rib 11a are in contact with the optical fiber cable 1, the optical fiber cable 1 is sandwiched and fixed. The surfaces of the cable fixing ribs 10 and 11 that are in contact with the optical fiber cable 1 are formed with such a curvature that the optical fiber cable 1 is sandwiched with a predetermined bending radius that is less than or equal to an allowable bending radius, as in this embodiment. Further, the optical fiber cable 1 is formed so as to be smoothly bent from the cable insertion hole 9 to the rear end portion of the outer skin gripping portion 6 and to secure a straight portion of the optical fiber cable 1 at the rear end portion of the outer skin gripping portion 6. Is desirable.

  As described above, since the optical fiber cable 1 is held in a bent state by the cable fixing ribs 10 and 11, the tensile strength in the pulling direction of the optical fiber cable 1 can be improved, and therefore, the optical fiber cable 1 is pulled. It is possible to prevent the optical fiber cable 1 from being detached from the optical receptacle 2 due to an external force applied. Further, since the optical fiber cable 1 can be efficiently bent by the cable fixing ribs 10 and 11, the outer shape of the case 3 can be minimized, and the manufacturing cost can be reduced.

It is sectional drawing which shows the receptacle for optical fibers of embodiment of this invention. It is a figure which shows the same as the above, (a) is a top perspective view, (b) is a front view. It is the exploded perspective view same as the above, (a) is the figure seen from the cover side, (b) is the figure seen from the body side. It is a whole perspective view same as the above.

Explanation of symbols

1 Optical fiber cable 2 Female connector (optical receptacle)
3 Case 4 Body 5 Cover 9 Cable insertion hole 10, 11 Cable fixing rib

Claims (1)

An optical fiber outlet in which a female optical connector to which a male optical connector can be inserted and removed is housed in a box-shaped case formed by abutting the respective opening surfaces of a body and a cover each having an opening on one side. a is, the body, the one side thereof is fixed in a manner to be opposed to the construction surface such as a wall, it has a cable insertion hole for guiding the optical fiber cable from the outside into the case, the cover, the cover body A protrusion that fits into the cable insertion hole of the body in a mounted state protrudes, and the body and the cover fix the optical fiber cable in a vicinity of the cable insertion hole inside the case with a predetermined bending radius that is equal to or less than an allowable bending radius. Cable fixing means and a fixing portion for fixing the female optical connector in the thickness direction of the case, respectively. Over the clamping said cable insertion holes of the inner wall and projections for holding the optical fiber cable as a cable fastening means, are erected in and the direction facing each other has a step between the cable insertion hole in the thickness direction a fiber optic cable Auxiliary ribs and cable fixing ribs that stand between the auxiliary ribs, the cable insertion holes, and the protrusions so as to face each other and sandwich the optical fiber cable. A plurality of protrusions sandwiching the optical connector on the female side, and a surface of the cable fixing rib that contacts the optical fiber cable is formed with a curvature with the predetermined bending radius. An optical fiber outlet.

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