JP4885886B2 - Multi-stage bending connector - Google Patents

Description

  The present invention relates to a multistage bendable connector that connects to an optical outlet adapter installed on a wall surface of a room in order to connect various optical communication devices.

  In recent years, FTTH (fiber to the home) has progressed, and an optical outlet has been installed in a room. Therefore, conventionally, as disclosed in Patent Document 1, a plurality of optical outlets are attached to an outlet box provided on a wall surface in the room, and an external light such as an optical fiber cord is connected to a connection adapter held in the optical outlet. There has been proposed a technique of an outlet part for connecting and inserting a connector plug perpendicular to a wall surface.

  However, since the conventional external optical connector plug is inserted and connected perpendicularly to the wall surface, the external optical connector plug itself protrudes vertically from the wall surface. For this reason, the external optical connector plug becomes an obstacle, and an accident such as a peripheral device hitting it and being damaged is expected.

Therefore, it is necessary to take some measures such as using a so-called multi-stage bending connector in which the boot is bent and deformed at a right angle and this tip is attached and fixed to the end of the stop ring of the optical connector plug. It has become. At this time, a guide protrusion that can be inserted into the key hole of the connection adapter is formed on the knob piece side of the optical connector plug.
JP 2005-106937 A

  However, in the past, once the boot is attached to the end of the stop ring of the multi-stage bending connector plug, it is necessary to change to a separate part, which requires time and labor for the work.

  In addition, since the conventional multi-stage bending connector has a guide projection that can be inserted into the key hole of the connection adapter on one side of the knob, the orientation of the multi-stage bending connector plug is changed while the boot is attached to the stop ring. It becomes impossible.

  In addition, if the boot is bent and deformed at a right angle, the inner optical fiber itself is bent at a right angle at a single point and extremely bent, and the bending radius of the optical fiber cannot be taken sufficiently. Therefore, there is a problem that transmission loss increases.

  Therefore, the present invention has been devised in view of the conventional circumstances as described above, has no effect on other parts, can adjust the orientation of the boot in a single touch in a short time, and An object of the present invention is to provide a multi-stage bendable connector that can suppress an increase in transmission loss by making it bendable so that a sufficient bending radius can be obtained.

In order to solve the above-described problems, in the present invention, an optical fiber of an optical cable is inserted and fixed, and a ferrule in which a flange is press-fitted and held at the rear end, and a ferrule abutting on the rear end of the flange and moving forward. A stop ring that supports the rear end of the spring to be urged, a plug frame that covers these members, a caulking seat that fixes the Kevlar of the optical cable to the stop ring, and a caulking ring that fixes the sheath of the optical cable to the caulking seat , A multi-stage bendable connector in which a boot is attached to the stop ring via a bending movable means,
The bending movable means includes a first hinge base fitted and fixed to a stop ring, a connection tube rotatably connected to the first hinge base, a rotation tube connected to the connection tube and a boot. A fixed second hinge base;
The first hinge base and the second hinge base are formed so that the boot can be bent in multiple stages symmetrically from the horizontal direction .

  The bending movable means is formed so that the boot bending direction can be bent and rotated up to 90 degrees symmetrically with respect to the horizontal direction.

  The bending movable means is pivotally attached to a cylindrical hinge hole portion in which a hinge arm projecting laterally on each hinge base is opposed to the hinge arm and opened laterally at both ends of the connecting tube. The engaging projection protruding from the outer peripheral surface of the tip is engaged with an arcuate window that extends through the inner peripheral surface on the back side of the hinge hole, and the optical cable inserted is concealed in the horizontal direction. The hinge base and the connecting tube are each provided with a bending space so as to allow bending in a symmetrical manner.

  The bending movable means has a concave-convex shape on the connection tube and each hinge base so as to lock the connection tube at a 45 degree rotation position of the connection tube with respect to the first hinge base and the second hinge base so as to keep the optical cable at the minimum bending radius. A rotation control unit is provided.

  In order to prevent excessive rotation of the rotation control unit, a plurality of recesses that are recessed according to the rotation angle of the connection tube are provided on the base end side of the hinge arm of each hinge base. A convex portion protruding from the inner peripheral surface of the opening side is engaged.

  The first hinge base is fixed to the stop ring by fitting a pair of left and right fittings projecting along the inner periphery of the opening end of the first hinge base into the fitting recess recessed along the outer periphery of the stop ring. A pair of upper and lower engaging pieces projecting from the opening end of the first hinge base are engaged with the pair of upper and lower key grooves of the plug frame covering the outer periphery of the stop ring.

  According to the present invention, there is no influence on other parts, the orientation can be adjusted in a short time with a single touch, and an increase in transmission loss is suppressed by allowing the optical fiber to be bent so that a sufficient bending radius can be taken. be able to.

  In other words, it is equipped with bending movable means that can bend the boot in multiple stages with respect to the stop ring, so it is necessary to remove the boot from the stop ring of the multi-stage bendable connector every time the boot direction is changed. Therefore, the orientation of the boot can be adjusted easily and in a short time with a single touch. At the same time, since the boot can be bent at a plurality of stages with respect to the stop ring, the bending radius of the optical fiber can be sufficiently taken, and an increase in transmission loss can be suppressed.

  The bending movable means includes a first hinge base fixed to the stop ring, a connection tube rotatably connected to the first hinge base, a rotation tube connected to the connection tube and a boot fixed. Since it can be bent in a plurality of stages by the hinge bases at both ends of the connecting tube, the orientation of the boot can be adjusted surely and smoothly with a simple configuration.

  The bending movable means is pivotally attached to a cylindrical hinge hole portion in which a hinge arm projecting laterally on each hinge base is opposed to the hinge arm and opened laterally at both ends of the connecting tube. The engaging projection protruding from the outer peripheral surface of the tip is engaged with an arcuate window that extends through the inner peripheral surface on the back side of the hinge hole, and the optical cable inserted is concealed in the horizontal direction. Since the bending space is provided inside each hinge base and connecting tube so that bending is allowed symmetrically from the outside, the optical cable is not damaged on the inner surface of the hinge base when the boot is rotated with respect to the stop ring and the hinge base. The bending radius of the optical cable, for example R15, can always be kept inside the bending space. In addition, the hinge arm engagement protrusion and the arcuate window portion of the hinge hole can prevent the hinge arm from coming out of the hinge hole and control the rotation angle of the bending movable means.

  Since the bending movable means is provided with a concave and convex rotation control unit on the connection tube and each hinge base so as to lock the connection tube at a 45 degree rotation position of the connection tube with respect to the first hinge base and the second hinge base, Excessive rotation of the connecting tube relative to each hinge base can be prevented in advance, thereby preventing damage to the optical cable.

  The rotation control unit protrudes from the hinge arm proximal end side of each hinge base to a plurality of recesses that are recessed according to the rotation angle of the connection tube, on the opening side inner peripheral surface of the hinge hole of the connection tube. Since the convex portions are engaged, it is easy to ensure the orientation of the bent boot with a simple configuration.

  The first hinge base is fixed to the stop ring by fitting a pair of left and right fittings projecting along the inner periphery of the opening end of the first hinge base into the fitting recess recessed along the outer periphery of the stop ring. Since the mating protrusion is fitted and the pair of upper and lower locking pieces protruding from the opening end of the first hinge base are locked to the pair of upper and lower key grooves of the plug frame covering the outer periphery of the stop ring, When the first hinge base is fitted to the stop ring, the first hinge base itself can be provided with a detent function by the locking piece fitted in the key groove of the plug frame.

The best mode for carrying out the multistage bending connector according to the present invention will be described below in detail with reference to the drawings.
As shown in FIGS. 9A and 9B, the multistage bending connector 1 according to the present invention is built in an outlet box M installed on a wall surface in the room for connecting various optical communication devices. As shown in FIGS. 1 and 2, the multi-stage bendable connector 1 is fixed by inserting an optical fiber core a and a flange 21 at the rear end. The ferrule 2 that is press-fitted and held, the stop ring 5 that supports the rear end of the spring 4 that contacts the rear end of the flange 21 and biases the ferrule 2 forward, the plug frame 3 that covers these members, and the tensile strength of the optical cable P A caulking seat 6 that fixes the Kevlar P1 that is a wire to the stop ring 5 and a sheath P2 that is a synthetic resin sheath covering the outside of the Kevlar P1 of the optical cable P are fixed to the caulking seat 6 That the caulking ring 7, the stop ring 5, and the boot 8 is mounted through the bent movable means 10 to be described later, and is generally composed of a knob 9 for is covered on the outside of the plug frame 3 and the stop ring 5.

  The ferrule 2 fixes the optical fiber core wire a by bonding the tip of the optical fiber core wire a with an adhesive or the like after insertion. The ferrule 2 is protected by being covered with the plug frame 3.

  The spring 4 is formed of a coil spring and is disposed so as to be sandwiched between the flange 21 and the stop ring 5, so that the front end thereof is in contact with the rear end of the flange 21 and the rear end is supported by the stop ring 5. . By supporting the rear end of the stop ring 5 in this manner, the spring 4 works together with the flange 21 to urge the ferrule 2 forward.

  As shown in FIG. 3 and FIG. 4, the front portion of the stop ring 5 is inserted into the plug frame 3 together with the ferrule 2, the flange 21 and the spring 4. In this case, a convex portion 5 a is formed above the outer surface of the front portion of the stop ring 5, and this convex portion 5 a serves as a guide when the stop ring 5 is inserted into the plug frame 3. On the other hand, the hook portion 3a projecting in a substantially C-ring shape below the stop ring 5 is engaged with the arc-shaped engagement hole 3b of the plug frame 3 to play a role of retaining.

  A boot 8 is attached to a rear portion of the stop ring 5 via bending movable means 10 that can be bent in a plurality of stages in a symmetric direction with respect to the stop ring 5. It is possible to rotate in a symmetrical direction up to a total of 90 degrees in two stages. That is, by this bending movable means 10, the boot 8 can be bent and rotated up to 90 degrees from the horizontal position along the stop ring 5 in any direction (symmetrical direction) up and down so that the bending radius of the optical cable P can be sufficiently taken. I am doing so.

  Specifically, as shown in FIGS. 1 to 4, the bending movable means 10 includes a first hinge base 10 a fixed to the stop ring 5, and a connection rotatably connected to the first hinge base 10 a. As shown in FIG. 5, the connecting tube 10c is connected to the first hinge base 10a. The second hinge base 10b is rotatably connected to the connecting tube 10c and fixed to the boot 8. On the other hand, the second hinge base 10b is pivotally attached so as to be rotatable in a symmetrical direction up to 45 degrees with respect to the connecting tube 10c.

  That is, as shown in FIGS. 3 and 4, the first hinge base 10 a has a flange having a hole through which the optical cable P is inserted at the center, integrally connected to one end opening side of the cylinder 20. Is formed in an arc concave shape. A substantially circular base portion is integrally extended forward from one end of the flange, and a pair of arcuate hinge arms 11 that are vertically opposed to each other protrude laterally at the center. . The width interval between the upper and lower hinge arms 11 is large enough to allow the optical cable P to pass therethrough, and an engagement protrusion 11a is provided on the outer peripheral surface of the tip of each hinge arm 11. In addition, a pair of left and right fitting projections 13 are provided along the inner circumference on the other end opening side of the cylinder 20, and the fitting recess 12 is provided along the circumference of the outer periphery of the stop ring 5. While engaging the fitting protrusion 13, the pair of locking pieces 14 protruding vertically on the other end opening side of the cylinder 20 are engaged with the pair of upper and lower key grooves 15 of the plug frame 3 covering the outer periphery of the stop ring 5. Accordingly, the first hinge base 10a is fixedly held at a required angle with respect to the stop ring 5 and the plug frame 3.

  On the other hand, as shown in FIGS. 3, 5A to 5C, and FIGS. 8A to 8D, both ends of the connecting tube 10c face the hinge arm 11 sideways. A cylindrical hinge hole portion 17 is integrally formed, and a pair of upper and lower arc-shaped window portions 17a are formed in the inner peripheral surface on the back side of the hinge hole portion 17, respectively. The length of the arcuate window portion 17a is such that the connecting tube 10c can rotate by 45 degrees with respect to the first hinge base 10a. In addition, an elongated rectangular opening 18 having a length that allows the optical cable P to be inserted and maintained within a rotational range in the symmetric direction of the connecting tube 10c is formed on the cylindrical peripheral surface of each hinge hole 17. When the pair of upper and lower hinge arms 11 is inserted into the hinge hole 17 of the connecting tube 10 c, the engagement protrusion 11 a at the tip of the hinge arm 11 is engaged with the arcuate window 17 a of the hinge hole 17. So that it can be pivoted. In this way, a bending space S (see FIG. 2) is formed in each of the first hinge base 10a and the connecting tube 10c so as to allow bending in the symmetric direction while the inserted optical cable P is concealed. At the same time, the connecting tube 10c can rotate in a symmetrical direction from the horizontal position to 45 degrees with respect to the first hinge base 10a (see FIGS. 5A to 5C).

  The second hinge base 10b is formed with a pair of upper and lower hinge arms 11 having the same configuration as the first hinge base 10a at one end of a small-diameter cylindrical portion 19 into which the boot 8 is fitted. When inserted into the hinge hole 17 formed at the other end of the tube 10 c, the engagement protrusion 11 a at the tip of the hinge arm 11 is engaged with the arcuate window 17 a of the hinge hole 17 to rotate. It is designed to be held freely. In this way, a bending space S (see FIG. 2) is formed inside each of the second hinge base 10b and the connecting tube 10c so as to allow bending in the symmetric direction while the inserted optical cable P is concealed. In addition, the second hinge base 10b can rotate in a symmetric direction up to 45 degrees with respect to the connecting tube 10c (see FIGS. 5A to 5C and FIGS. 6A to 6C). ).

  Further, as shown in FIGS. 7A to 7C, the bending movable means 10 includes the connection tube 10c at a 45 ° rotation position of the connection tube 10c with respect to the first hinge base 10a and the second hinge base 10b. In order to lock, the connection tube 10c and the hinge bases 10a and 10b are provided with an uneven rotation control unit 16.

  Specifically, the rotation control unit 16 is provided on the base portion of the first hinge base 10a and the second hinge base 10b on the base end side of each hinge arm 11 up to 45 degrees from the horizontal position of the connecting tube 10c in the symmetric direction. The three recessed portions 16a, 16b, 16c that are recessed according to the rotation angle of the connecting tube 10c are protruded from the inner peripheral surface on the opening side of the hinge hole portion 17 of the connecting tube 10c so as to face the recessed portions 16a, 16b, 16c. It consists of one convex part 16d.

  Accordingly, as shown in FIG. 5A, when the boot 8 is in the horizontal position, the convex portion 16d of the connecting tube 10c is engaged with the central concave portion 16b of the first hinge base 10a and the second hinge base 10b. Then, as shown in FIG. 5C, when the boot 8 is rotated upward 90 degrees, the convex portion 16d of the connecting tube 10c is engaged with the concave portion 16a on the upper side of the first hinge base 10a and the second hinge base 10b. 5B, when the boot 8 is rotated in the lower 90-degree direction, the convex portion of the connecting tube 10c is formed in the concave portion 16c on the lower side of the first hinge base 10a and the second hinge base 10b. 16d is engaged. Therefore, the rotation angle of the connecting tube 10c with respect to the first hinge base 10a and the second hinge base 10b is controlled.

  A caulking seat 6 and a caulking ring 7, both made of metal, are arranged at the rear of the stop ring 5. The caulking seat 6 and the caulking ring 7 hold the Kevlar P1 and the sheath P2 of the optical cable P with respect to the stop ring 5, respectively.

  That is, as shown in FIGS. 1 and 2, the caulking seat 6 includes a large-diameter front cylindrical portion 6a and a small-diameter rear cylindrical portion 6b that are connected to each other via a substantially central stepped portion 6c. The front cylindrical portion 6a is fitted to the outer periphery of the rear portion of the stop ring 5 together with the Kevlar P1 inside the sheath P2 from which the optical cable P is cut. In addition, the sheath P2 is fixed by caulking the caulking ring 7 from the outside after the cutting end of the sheath P2 is put on the rear cylinder portion 6b.

  In addition, the plug frame 3 is formed in a round structure, and a pair of guide portions are formed in the vertically symmetric position of the plug frame 3 corresponding to the key holes in the vertically symmetric position formed on the knob 9. It is. When the guide 9 is mounted on the plug frame 3, the guide portions have different widths so that the guide portions are inserted and inserted in one direction into the key holes at the vertically symmetrical positions formed on the tab 9. Is formed.

  Further, as shown in FIG. 1 (a), one side of the knob 9 can be inserted into the key hole of the connection adapter to guide the optical outlet adapter Q so as to allow connection from one direction. A guide protrusion 9a is formed.

  9 (a) and 9 (b) show an example of the use of a multi-stage bending connector, where M is an outlet box connected to the optical branching box B via a flexible pipe 15, and Q is an outlet. An optical outlet adapter attached to the front plate of the box M.

  In the figure, an optical outlet adapter Q is connected to an optical branching box B via an optical cable P at the rear end. On the other hand, the multistage bending connector 1 connected to the personal computer R via the optical cable P at the front end is detachably connected.

Next, an example of assembly and use of the best mode of the multistage bending connector of the present invention configured as described above will be described.
First, as shown in FIG. 3, the pair of left and right hinge arms 11 formed at one end of the cylindrical portion 19 of the second hinge base 10b fitted into the opening end of the boot 8 is connected to one hinge hole of the connecting tube 10c. Insert into part 17. Further, the pair of left and right hinge arms 11 formed at one end of the first hinge base 10a is inserted into the other hinge hole 17 of the connecting tube 10c. At this time, the engaging projection 11a at the tip of the hinge arm 11 is engaged with the arcuate window 17a of the hinge hole 17 and is held rotatably. At the same time, the cut end portion of the optical cable P inserted in advance into the boot 8 passes through the cylindrical portion 19 of the second hinge base 10b, the openings 18 at both ends of the connecting tube 10c, and the hole portions of the flange of the first hinge base 10a. The first hinge base 10a is pulled out from the cylinder 20 in advance.

  Then, after the sheath P2 and the Kevlar P1 are exposed from the cut end of the optical cable P, the cut end of the sheath P2 is placed on the rear cylindrical portion 6b of the caulking seat 6, and the caulking ring 7 is caulked from the outside. Fix it.

  And the front side cylinder part 6a of the crimping seat 6 is fitted on the rear outer periphery of the stop ring 5 together with the Kevlar P1 expanded from the cut end of the sheath P2.

  Thereafter, the bending movable means 10 together with the boot 8 is moved to the cut end portion side of the optical cable P, and the fitting projection 13 of the first hinge base 10a is moved into the fitting recess 12 of the stop ring 5 by its own bending. Fit. Then, the fitting protrusion 13 of the cylinder 20 of the first hinge base 10a is fitted into the fitting recess 12 on the outer periphery of the stop ring 5, and the pair of upper and lower locking pieces 14 of the cylinder 20 are placed on the outer periphery of the stop ring 5. The plug frame 3 is covered with a pair of upper and lower key grooves 15 (see FIGS. 3 and 4).

  The tip of the optical fiber core a is inserted into the ferrule 2 and bonded with an adhesive or the like, so that the optical fiber core a is fixed. The ferrule 2 has a flange 21 press-fitted and held at the rear end thereof.

  Then, the spring 4 is inserted from the rear end of the flange 21 of the ferrule 2, and the plug frame 3 and the stop ring 5 are respectively inserted and arranged at predetermined positions. At this time, the convex portion 5 a provided above the stop ring 5 serves as an insertion guide for the plug frame 3, while the hook portion 3 a provided below the stop ring 5 engages with the locking hole 3 b of the plug frame 3. Stops it when it is stopped.

  At this time, the spring 4 is disposed so as to be sandwiched between the flange 21 at the rear end of the ferrule 2 and the stop ring 5 and acts so as to constantly bias the ferrule 2 forward.

  Finally, the knob 9 is put on the outside of the plug frame 3 and the stop ring 5. At this time, the plug frame 3 is inserted and inserted in one direction into the key hole at the vertically symmetrical position formed in the knob 9 (see FIGS. 1 and 2).

  When the multistage bending connector 1 is used, as shown in FIG. 9A, the optical outlet adapter Q built in the outlet box M installed on the wall surface of the room for connecting various optical communication devices A multi-stage bending connector 1 is connected.

  For example, when the counterpart optical connector plug 1 from the personal computer R is connected to the counterpart terminal of the optical outlet adapter Q, the personal computer R is connected to the optical outlet adapter as shown in FIGS. 2 (b) and 9 (b). In the case where it is arranged below Q, the connecting tube 10c in the bending movable means 10 is rotated to 45 degrees below the first hinge base 10a, and the second hinge base 10b is moved with respect to the connecting tube 10c. Rotate to the bottom 45 degrees. Thus, the boot 8 and the optical cable P are rotated so as to extend downward.

  On the other hand, when the personal computer R is arranged above the optical outlet adapter Q, the connecting tube 10c in the bending movable means 10 is rotated up to 45 degrees on the upper side with respect to the first hinge base 10a, and the second hinge base 10b is rotated up to 45 degrees on the upper side with respect to the connecting tube 10c. Thus, the boot 8 and the optical cable P are rotated so as to extend upward.

  Further, as shown in FIG. 5A, when the boot 8 is in the horizontal position, the convex portion 16d of the connecting tube 10c engages with the central concave portion 16b of the first hinge base 10a and the second hinge base 10b. .

  Further, as shown in FIG. 5 (c), when the boot 8 is rotated upward 90 degrees, the convex portion 16d of the connecting tube 10c is formed in the concave portion 16a on the upper side of the first hinge base 10a and the second hinge base 10b. Engage.

  Further, as shown in FIG. 5B, when the boot 8 is rotated in the lower 90-degree direction, the convex portion of the connecting tube 10c is formed in the concave portion 16c on the lower side of the first hinge base 10a and the second hinge base 10b. 16d is engaged. Thus, the rotation angle of the connecting tube 10c with respect to the first hinge base 10a and the second hinge base 10b is controlled.

  In this way, the boot 8 is bent and rotated in the symmetrical direction by 90 degrees via the bending movable means 10, so that the optical outlet adapter Q is installed on the lower side or the upper side of the wall surface or on any place such as the ceiling. However, the external multistage bendable connector 1 itself connected to the optical outlet adapter Q does not become an obstacle to peripheral devices. Moreover, since the boot 8 is bent and rotated by a total of 90 degrees through the two-stage bending movable means 10 that rotates 45 degrees in either of the upper and lower directions, the bending radius (for example, R15) of the optical cable P is sufficiently increased. The increase in transmission loss is suppressed.

  In the present embodiment, the bending movable means 10 has been described based on two bendings (corresponding to the bending radius R15 of the optical cable P) of the first hinge base 10a and the second hinge base 10b. However, the present invention is not limited to this, and the optical cable P may be set to be bent at a bending radius of R15 or more by being formed by three or more bent portions.

An example of the multistage bending type connector in the best form for implementing this invention is shown, (a) is a top view, (b) is sectional drawing seen from the plane side. Similarly, it shows the internal structure of the multi-stage bending connector, (a) is a cross-sectional view seen from the side, (b) is a cross-sectional view seen from the side when the boot is bent 90 degrees downward by the bending movable means. FIG. Similarly, it is a perspective view of a state in which a plug frame, stop ring, caulking ring, bending movable means (first hinge base, connecting tube, second hinge base) and boot are disassembled. It is a perspective view of the state which similarly assembled | attached the plug frame, the stop ring, the crimping ring, the bending movable means (a 1st hinge base, a connection tube, a 2nd hinge base), and a boot. Similarly, the operation of the bending movable means will be described. (A) is a side view of a state in which the boot extends in a straight line, (b) is a side view of the state in which the boot is bent downward by 90 degrees, (c) ) Is a side view of the state in which the boot is bent upward by 90 degrees. Similarly, the operation of the bending movable means will be described. (A) is a side view of the state in which the second hinge base is in a horizontal position with respect to the connection tube, and (b) is a state in which the second hinge base is 45 relative to the connection tube. (C) is a side view of a state in which the second hinge base is rotated upward by 45 degrees with respect to the connecting tube. FIG. 2 also shows an example of the configuration of the rotation control unit in the bending movable means, in which (a) is a partially cutaway side view of the state before the connection tube is attached to the first hinge base, and (b) is the first connection tube. The partially cutaway side view of the state after mounting on the hinge base, (c) is a side view of the state before mounting the connecting tube to the first hinge base. Similarly, the configuration of the bending movable means is shown, (a) is a side view of a state before the connecting tube is attached to the first hinge base and the second hinge base, and (b) is a sectional view taken along line XX of (a). (C) is a side view of the state after attaching a connection tube to the 1st hinge base and the 2nd hinge base, (d) is a YY sectional view of (c). It shows an example of the usage state of the multi-stage bending connector, (a) is a partially cutaway sectional view of a state in which the multi-stage bending connector is connected to the optical outlet adapter provided in the outlet box installed on the wall surface (B) is a partially cutaway sectional view showing a use state when the personal computer is arranged on the lower side of the optical outlet adapter.

P Optical cable P1 Kevlar P2 Sheath Q Optical outlet adapter R PC S Bending space M Outlet box B Optical branch box a Optical fiber core 1 Multi-stage bending connector 2 Ferrule 3 Plug frame 3a Hook 3b Locking hole 4 Spring 5 Stop ring 5a Protruding part 6 Caulking seat 6a Front side cylinder part 6b Rear side cylinder part 6c Stepped part 7 Caulking ring 8 Boot 9 Knob 10 Bending movable means 10a First hinge base 10b Second hinge base 10c Connection tube 11 Hinge arm 11a Engagement protrusion 12 Fitting Joint recess 13 Fitting protrusion 14 Locking piece 15 Key groove 16 Rotation control parts 16a, 16b, 16c Concave part 16d Convex part 17 Hinge hole part 17a Arc-shaped window part 18 Opening part 19 Cylinder part 20 Cylinder 21 Flange

Claims (6)

A ferrule in which an optical fiber of an optical cable is inserted and fixed, and a flange is press-fitted and held at the rear end, a stop ring that supports the rear end of a spring that contacts the rear end of the flange and biases the ferrule forward, A plug frame that covers each member, a caulking seat that fixes the Kevlar of the optical cable to the stop ring, a caulking ring that fixes the sheath of the optical cable to the caulking seat, and a boot that is attached to the stop ring via a bending movable means A multi-stage bending connector,
The bending movable means includes a first hinge base fitted and fixed to a stop ring, a connection tube rotatably connected to the first hinge base, a rotation tube connected to the connection tube and a boot. A fixed second hinge base;
A multi-stage bending connector characterized in that the first hinge base and the second hinge base are formed so that the bending direction of the boot can be bent in multiple stages symmetrically from the horizontal direction . The multi-stage bending connector according to claim 1 , wherein the bending movable means is formed so as to be bent and rotated up to 90 degrees symmetrically with respect to the boot bending direction from the horizontal direction. The bending movable means is pivotally attached to a cylindrical hinge hole portion in which a hinge arm projecting laterally on each hinge base is opposed to the hinge arm and opened laterally at both ends of the connecting tube. The engaging projection protruding from the outer peripheral surface of the tip is engaged with an arcuate window that extends through the inner peripheral surface on the back side of the hinge hole, and the optical cable inserted is concealed in the horizontal direction. The multi-stage bendable connector according to claim 1 , further comprising a bending space inside each hinge base and connecting tube so as to allow bending in a symmetrical manner. Bending the movable means, the claims and includes an uneven rotation control unit the connecting tube to the connection tube and the hinge base to be locked in 45 degree rotation position of the connecting tube relative to the first hinge base and a second hinge base The multistage bending connector according to 1 or 2 . The rotation control unit protrudes from the hinge arm proximal end side of each hinge base to a plurality of recesses provided in accordance with an arbitrary rotation angle of the connection tube, and to the opening side inner peripheral surface of the hinge hole portion of the connection tube. The multistage bending type connector according to claim 4, wherein the provided convex portion is engaged. The first hinge base is fixed to the stop ring by fitting a pair of left and right fittings projecting along the inner periphery of the opening end of the first hinge base into the fitting recess recessed along the outer periphery of the stop ring. with fitting the engagement projection, the upper and lower pair of locking pieces projecting from the open end of the first hinge base, the claims are intended to be engaged in the pair of upper and lower keyway of the plug frame which covers the stop ring outer periphery The multistage bending connector according to any one of claims 1 to 4 .

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