JP2019091832A - Branching device and intercom system - Google Patents

Abstract

To provide a branching device and an intercom system capable of reducing the possibility of disconnection of lead wire.SOLUTION: A branching device 2 includes a first wire passing portion S1 and a second wire passing portion S2. In the first wire passing portion S1, a first portion of a pair of input lead wires L1, L2, a pair of output lead wires L3, L4 and a pair of branch lead wire L5, L6 pass therethrough along a first direction. In the second wire passing portion S2, a second portion of the pair of input lead wires L1, L2, the pair of output lead wires L3, L4 and the pair of branch lead wires L5, L6 pass therethrough along a second direction crossing the first direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a splitter and interphone system, and more particularly to a splitter including a plurality of lead wires and an interphone system including a plurality of the splitters.

  As an example of the prior art, an image pair wire branching / dividing device described in Patent Document 1 will be exemplified. The video pair line branching / dividing device described in Patent Document 1 can be used, for example, in an integrated residential telephone call system. In the image pair wire type branching / dispensing device described in Patent Document 1, the electric wire is disposed in the groove for arranging the electric wire, and the core wire of the electric wire is inserted by being inserted into the quick connection terminal.

Unexamined-Japanese-Patent No. 08-171946 gazette

  However, in the image pair wire type branch / divider described in Patent Document 1, there is a possibility that the wire (lead wire) may be detached from the image pair wire type branch / divider when a force is applied to the wire by pulling the wire. there were.

  An object of the present invention is to provide a branching device capable of reducing the possibility of lead wire detachment and an interphone system including a plurality of the branching devices.

  In order to solve the above-mentioned subject, a branching machine concerning one mode of the present invention is provided with a box-like main part, a pair of input lead wires, a pair of output lead wires, and a pair of branch lead wires. . One end of the pair of input lead wires is positioned inside the main body, and the other end is positioned outside the main body. One end of the pair of output lead wires is electrically connected to the pair of input lead wires inside the main body portion, and the other end is located outside the main body portion. One end of the pair of branch lead wires is electrically connected to the pair of input lead wires inside the main body portion, and the other end is located outside the main body portion. Each of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires is a first portion including a part of an intermediate portion between the one end and the other end, and the intermediate portion And a second part consisting of a part other than the first part. The branching unit includes a first line portion and a second line portion. The first portions of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires are passed along the first direction through the first wire connection portion. In the second line portion, the second portion of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires is passed along a second direction crossing the first direction. Ru.

  An intercom system according to an aspect of the present invention includes a plurality of the branching devices. The interphone system further includes a plurality of dwelling unit terminals and a communication device. The plurality of dwelling unit terminals are electrically connected to the plurality of branching devices. The communication device is electrically connected to the plurality of dwelling unit terminals via the plurality of branching devices and communicates with the plurality of dwelling unit terminals.

  In the branching device and interphone system according to an aspect of the present invention, the possibility of lead wire detachment can be reduced.

FIG. 1 is a perspective view seen from the front side of the splitter according to the first embodiment. FIG. 2 is an exploded view of the branching device of the same. FIG. 3 is a perspective view seen from the rear side of the above branching device. FIG. 4 is a perspective view showing a state in which the mounting portion is separated from the main body in the above-described branching device. FIG. 5 is a cross-sectional perspective view of the branching device of the same. FIG. 6 is a cross-sectional view of the branching device of the same. FIG. 7 is a circuit diagram of the branching device of the same. FIG. 8 is a block diagram of the intercom system according to the first embodiment. FIG. 9 is an exploded perspective view of the splitter according to the second embodiment. FIG. 10 is a plan view of the body of the branching device of the same.

  Hereinafter, the branching device and the intercom system according to the embodiment will be described with reference to the drawings. However, the embodiments described below are only some of the various embodiments of the present disclosure. The following embodiments can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved.

  The branching unit described in the following embodiment is included in the intercom system 1 (see FIG. 8) provided in a housing complex or the like. In the intercom system 1, the plurality of dwelling unit terminals 81 (see FIG. 8) and the communication device 82 (see FIG. 8) are electrically connected by the bus wiring using the plurality of branching devices 2 (see FIG. 8) . Thus, the communication device 82 can communicate with a plurality of dwell unit terminals 81.

(1) Embodiment 1
(1.1) External Shape of Branching Device As shown in FIGS. 1 and 2, the branching device 2 includes the housing 3, a pair of input lead wires L1 and L2, a pair of output lead wires L3 and L4, and a pair Branch leads L5 and L6 of FIG. The splitter 2 further includes a pair of termination leads L7 and L8. Hereinafter, the input lead lines L1 and L2, the output lead lines L3 and L4, and the branch lead lines L5 and L6 are collectively referred to as lead lines L1 to L6. Further, the input lead L1, L2, the output lead L3, L4, the branch lead L5, L6 and the end lead L7, L8 are collectively referred to as lead L1 to L8.

  The housing 3 has a box-shaped main body portion 30 and an attachment portion 4. Body portion 30 includes a body 3a and a cover 3b coupled to body 3a. The body 3a is formed in a box shape (rectangular parallelepiped shape) in which the opening 30a is formed in one surface 306 (see FIG. 3). The cover 3b is coupled to the body 3a so as to close the opening 30a.

  The body 3a includes a plate-like facing portion 35a facing the cover 3b, and first, second, third and fourth side walls 31a, 32a, 33a and 34a. The first, second, third and fourth side walls 31a, 32a, 33a and 34a protrude from the peripheral edge of the facing portion 35a along the thickness direction of the facing portion 35a. The first side wall 31a and the second side wall 32a face each other, and the third side wall 33a and the fourth side wall 34a face each other.

  Hereinafter, unless otherwise noted, the direction in which the cover 3b and the facing portion 35a face each other in FIG. 2 is referred to as the front-rear direction, the cover 3b side is the rear, and the facing portion 35a side is the front. The direction in which the first side wall 31a and the second side wall 32a face each other is the vertical direction, the first side wall 31a side is the upper side, and the second side wall 32a side is the lower side. The direction in which the third side wall 33a and the fourth side wall 34a face each other is referred to as the left-right direction, the third side wall 33a side is the left, and the fourth side wall 34a side is the right.

  In the rectangular parallelepiped body 3a in which the opening 30a is formed, the recess 300 is formed in the region corresponding to the four apexes on the opposite side (front side) to the opening 30a. A through hole 301 is formed on the bottom of the four recesses 300. That is, four through holes 301 are formed in the body 3a.

  The mounting portion 4 is connected to the main body portion 30. More specifically, the mounting portion 4 is integrally formed with the main body portion 30.

  The mounting portion 4 protrudes upward from the rear end of the first side wall 31 a. The mounting part 4 is formed in plate shape in which the mounting hole 40 which penetrates the mounting part 4 was formed. More specifically, the mounting portion 4 is formed in a U-shape as viewed from the front-rear direction by forming the mounting holes 40 in a semicircular structure as viewed from the front-rear direction. Two ends of the U-shaped mounting portion 4 as viewed from the front-rear direction are connected to the first side wall 31 a.

  The housing 3 is attached to the mounting object by, for example, screwing a screw 46 passed through the mounting hole 40 of the mounting portion 4 into the mounting object (such as a wall of a building). The screw 46 is, for example, a wood screw.

  As shown in FIG. 3, the rear surface 305 of the main body 30 includes the first surface 306 formed with the opening 30 a of the body 3 a and the rear surface 307 of the cover 3 b inserted into the opening 30 a. The rear surface 305 is formed flat. The mounting portion 4 protrudes from the main body 30 along the rear surface 305. More specifically, the rear surface 405 of the mounting portion 4 is flush with the rear surface 305 of the main body 30. The rear surface 305 is a surface opposite to the mounting target (such as a wall of a building) of the housing 3.

  As shown in FIGS. 1 and 2, the mounting hole 40 is a slack hole. The mounting hole 40 has a first hole 41 and a second hole 42 connected to the first hole 41. The second holes 42 are aligned with the first holes 41 in one direction (vertical direction). The second hole 42 is formed between the first hole 41 and the first side wall 31 a. The first hole 41 and the second hole 42 are formed in a convex bell shape. The width D2 of the second hole 42 is larger than the width D1 of the first hole 41 in a direction (left-right direction) orthogonal to one direction (vertical direction) in which the first hole 41 and the second hole 42 are arranged.

  The mounting portion 4 has a separating portion 43. The attachment portion 4 is separable from the main body portion 30 (body 3 a) at the separation portion 43. The separation portion 43 includes two thin portions 44. The two thin portions 44 are formed at the boundary between the mounting portion 4 and the main body 30 (body 3 a). That is, the two thin portions 44 are formed one by one at two ends of the attachment portion 4 connected to the first side wall 31 a. The two thin portions 44 have a smaller thickness than the portion of the mounting portion 4 other than the two thin portions 44. More specifically, the mounting portion 4 is recessed in the two thin portions 44 into a groove shape having a triangular shape in a side view.

  The mounting hole 40 extends to a part of a boundary portion of the mounting portion 4 with the main body portion 30 (body 3 a). That is, the separation portion 43 and a part of the mounting hole 40 are formed at the boundary portion between the mounting portion 4 and the main body portion 30 (body 3 a).

  The two thin portions 44 are broken by bending the mounting portion 4 with respect to the main portion 30 (body 3a) around the two thin portions 44. Thereby, the attaching part 4 isolate | separates from the main-body part 30 (body 3a) in the isolation | separation part 43 (two thin part 44) (refer FIG. 4).

  Body 3a further includes a boss 3c. The boss 3 c is formed in a substantially bottomed cylindrical shape. The boss 3c has a screw hole 30c into which a screw 3d for coupling the cover 3b to the body 3a is screwed from the rear. The boss 3c protrudes from the outer surface (surface 330a) of the third side wall 33a. The axial direction of the boss portion 3c is along the front-rear direction, and is substantially parallel to the outer surface (surface 330a) of the third side wall 33a.

  FIG. 5 is a cross-sectional view of the branching unit 2 cut in a plane orthogonal to the front-rear direction and a plane orthogonal to the vertical direction. FIG. 6 is a cross-sectional view of the branching unit 2 cut in a plane perpendicular to the vertical direction. As shown in FIGS. 5 and 6, a plurality of (two in FIG. 5) insertion holes 341 are formed in the fourth side wall 34a of the body 3a. A plurality of claws 321 described later of the cover 3 b are inserted into the plurality of insertion holes 341. The body 3a further includes a holding claw 342 protruding from the fourth side wall 34a toward the inside of the main body 30, and a holding claw 332 protruding from the third side wall 33a toward the inside of the main body 30. Including. The branching unit 2 further includes a circuit mounting board 5. The circuit board 51 of the circuit mounting board 5 is held by the holding claws 342 and 332, whereby the circuit board 51 is held inside the main body 30.

  As shown in FIGS. 1 and 2, the cover 3 b has a flat cover body 31 b whose thickness direction is along the front-rear direction, a peripheral wall 32 b, a first projecting wall 33 b, a second projecting wall 34 b, and a step And 35b. The branching unit 2 further includes a projecting portion 3 e integrally formed with the cover 3 b.

  The cover main body 31b is formed in a rectangular shape that closes the opening 30a of the body 3a. The peripheral wall portion 32b is formed in a region near the upper side, a region near the lower side, a right side, and a part of the left side in the peripheral edge of the cover main body 31b. The peripheral wall portion 32b protrudes forward from the cover main body 31b along the thickness direction of the cover main body 31b. The first projecting wall 33 b is formed in a region near the upper side of the cover 3 b. The first projecting wall 33b protrudes forward from the peripheral wall 32b along the thickness direction of the cover main body 31b. The second projecting wall 34 b is formed in a region near the lower side of the cover 3 b. The second protruding wall 34b protrudes forward from the peripheral wall 32b along the thickness direction of the cover main body 31b. The first and second projecting walls 33b and 34b are inserted into the body 3a through the opening 30a.

  As shown in FIG. 5, the cover 3b further includes a plurality of (two in FIG. 5) claws 321 protruding outward from the peripheral wall 32b. The plurality of claws 321 are inserted into the plurality of insertion holes 341 of the body 3a.

  As shown in FIGS. 1 and 2, the protruding portion 3 e protrudes leftward from the peripheral edge of the cover main body 31 b along the surface direction of the cover main body 31 b. When the cover 3b is coupled to the body 3a, the protrusion 3e is located outside the main body 30 (see FIG. 1). The protruding portion 3e has a screw insertion hole 30e opposed to the screw hole 30c of the boss 3c of the body 3a. In a state where the plurality of claws 321 are inserted into the plurality of insertion holes 341 of the body 3a, the cover 3b is formed by screwing the screw 3d passed through the screw insertion hole 30e into the screw hole 30c of the boss 3c. Combined with 3a.

  The protruding portion 3e includes a first wall 31e, a second wall 32e, a third wall 33e, and a fourth wall 34e. The first wall portion 31 e is formed in a rectangular plate shape whose thickness direction is along the front-rear direction. The second wall 32e protrudes forward from the upper side of the first wall 31e. The third wall 33 e protrudes forward from the left side of the first wall 31 e. The fourth wall 34 e protrudes forward from the lower side of the first wall 31 e. In addition, the third wall 33 e has a recess 330 e that is recessed rearward from the front end. The third wall 33e has a chamfered portion 331e (see FIG. 6) having a chamfered shape at the corner on the front end on the right side of the recess 330e.

  The step 35 b is formed in the left region of the cover 3 b. The stepped portion 35b protrudes forward from the cover main body 31b along the thickness direction of the cover main body 31b. The step 35 b is shorter in the front-rear direction than the peripheral wall 32 b. In the state where the cover 3b is coupled to the body 3a, a gap (through hole 302) is formed between the step 35b and the third side wall 33a of the body 3a (see FIGS. 1 and 5). That is, the through hole 302 is formed in the main body 30. The width in the front-rear direction of the through hole 302 is slightly larger than the diameters of the lead wires L1 to L8. The opening surface of the through hole 302 on the outer surface (surface 330a) of the third side wall 33a of the main body 30 faces the third wall 33e. That is, the third wall 33 e is disposed at a position facing the opening surface of the through hole 302 outside the main body 30.

  In the main body 30, the surface 310a (the outer surface of the first side wall 31a) connected to the mounting portion 4 is a surface different from the surface 330a (the outer surface of the third side wall) in which the through hole 302 is formed.

  The circuit mounting board 5 includes a circuit board 51 and a plurality of electronic components (for example, the transformer 67, the capacitors 61 to 64, and the resistors 65 and 66 in FIG. 7). The circuit board 51 is held inside the main body 30. Lead wires L1 to L8 are connected to the circuit board 51. The lead wires L <b> 1 to L <b> 8 connected to the circuit board 51 are drawn out of the main body 30 through the through holes 302.

  The lead wires L1 to L6 have the same configuration. The termination leads L7, L8 have the same configuration. In FIG. 2, only the input lead L1 is shown as a representative of the leads L1 to L6, and only the termination lead L7 is shown as a representative of the termination leads L7 and L8.

  At both ends (the first end 101 and the second end 102) of the lead wires L1 to L6, the coating 103 is peeled off, and the core wire 104 inside the coating 103 is exposed. In the lead wires L1 to L6, the core wire 104 in a region having a length of, for example, about 2 mm is exposed from both ends. The first ends 101 of the lead wires L1 to L6 are connected to the circuit board 51. More specifically, the first ends 101 of the lead wires L1 to L6 are connected to the circuit board 51 via the board-in connector 52 (see FIG. 6).

  The coating 113 is peeled off at one end (first end 111) of the terminal lead L7, L8, and the core wire 114 inside the coating 113 is exposed. In the end lead wires L7 and L8, the core wire 114 in a region of about 2 mm in length from the first end 111 is exposed. One end (first end 111) of the termination lead L7, L8 is connected to the circuit board 51. More specifically, the first ends 111 of the termination leads L7, L8 are connected to the circuit board 51 via the board-in connector 52 (see FIG. 6).

  In the terminal lead wires L7 and L8, the core wire 114 of a portion (exposed portion 1150) of the intermediate portion 115 between one end (first end 111) and the other end (second end 112) is exposed. That is, in the end lead wires L7 and L8, the core wire 114 of a part (exposed portion 1150) different from the ends (the first end 111 and the second end 112) is exposed. More specifically, in the end leads L7 and L8, the coating 113 is peeled off in the first end 111, the exposed portion 1150, and the area from the second end 112 to the exposed portion 1150. Furthermore, in the end lead wires L7 and L8, the tape 116 is wound around a portion other than the first end 111 and the exposed portion 1150 in the portion where the coating 113 is peeled off. The tape 116 has electrical insulation. The tape 116 bundles a large number of thin lines that constitute the core wire 114 inside the sheath 113.

  Therefore, the core wire 114 of the terminal lead L7, L8 is exposed only at the first end 111 and the exposed portion 1150. When connecting the terminal lead L7, L8 to the output lead L3, L4, the operator removes the tape 116 to expose the core 114 inside the tape 116.

(1.2) Arrangement of Lead Wires Next, with reference to FIGS. 5 and 6, the arrangement of the lead wires L1 to L8 in the branching device 2 will be described. In FIGS. 5 and 6, only the input lead L1 is shown among the leads L1 to L8 in order to simplify the drawing. In the following description, only the arrangement of the input lead L1 will be described, but the leads L1 to L8 are similarly arranged.

  An input lead L1 whose first end 101 (see FIG. 2) is connected to the circuit board 51 extends from the circuit board 51 and passes through the through hole 302. Accordingly, the first end 101 of the input lead L1 is located inside the main body 30, and the second end 102 is located outside the main body 30. A first portion 107 formed of a part of the intermediate portion 105 between the first end 101 and the second end 102 of the input lead L1 is a space inside the through hole 302, the first wire passing portion S1. Passed through. In addition, a second portion 108 of the middle portion 105 of the input lead L1 and made up of a portion different from the first portion 107 is passed through a second line portion S2 outside the main body portion 30. The second line portion S2 is surrounded by the first wall 31e, the second wall 32e, the third wall 33e and the fourth wall 34e (see FIG. 1), and the third side wall 33a of the main body 30. Space. That is, the third wall 33 e forms a second wire passing portion S <b> 2 between itself and the third side wall 33 a of the main body 30. The first line portion S1 and the second line portion S2 are connected to each other.

  The main body portion 30 penetrates in the left-right direction in the through hole 302. That is, the first wire passing portion S1 inside the through hole 302 is a space along the left-right direction (first direction). The first portion 107 of the input lead L1 is passed through the first wire passing portion S1 along the left-right direction (first direction). In other words, the first portion 107 of the input lead L1 is guided by the third side wall 33a and the step 35b around the through hole 302 in the through hole 302, so that the first wire passing along the left-right direction. Part S1 is passed.

  When the cover 3b is coupled to the body 3a, the second wire connection portion S2 is covered from the left side by the third wall 33e, and the second wire S2 is not connected to the third body portion 30 except for the region where the through hole 302 is formed. It is covered from the right side by the step part 35b of 3 side wall 33a and the cover 3b. That is, the second line portion S2 is a space along the front-rear direction (second direction) intersecting with the left-right direction (first direction). In addition, the second line portion S2 is covered from the rear side by the first wall 31e, and is covered from the top and the bottom by the second wall 32e and the fourth wall 34e (see FIG. 1).

  Therefore, in the input lead L1, the second portion 108 of the intermediate portion 105 is passed through the second wire passing portion S2 along the front-rear direction (second direction). That is, since the second wall 32e, the third wall 33e and the fourth wall 34e of the protruding portion 3e and the third side wall 33a of the body 3a are formed along the front-rear direction, The second portion 108 is guided by at least one of the second wall 32 e, the third wall 33 e, the fourth wall 34 e, and the third side wall 33 a, thereby forming the second wire passing portion S2 along the front-rear direction. Passed through. The second end 102 of the input lead L1 is drawn forward, for example, from the second line portion S2.

  When the input lead L1 is drawn out from the inside to the outside of the main body 30, the first portion 107 is passed along the left-right direction to the first line portion S1. A portion of the middle portion 105 between the first portion 107 and the second portion 108 contacts, for example, the third wall 33 e and bends so as to change from the direction along left and right to the direction along the front and back. Further, when the input lead L1 is drawn into the inside from the outside of the main body 30, for example, the second portion 108 is passed to the second line portion S2 along the longitudinal direction, and the first portion 107 is along the lateral direction. Thus, the first line S1 is passed. Therefore, a portion of the intermediate portion 105 between the first portion 107 and the second portion 108 bends so as to change from the direction along the front and back to the direction along the left and right.

  Thus, the intermediate portion 105 of the input lead L 1 bends outside the main body 30 between the first portion 107 and the second portion 108. That is, since the first line portion S1 and the second line portion S2 intersect at the outside of the main body 30, the middle portion 105 of the input lead L1 is formed by the first line portion S1 and the second line S1. By being passed through the wire portion S2, it bends at the outside of the main body portion 30.

  As described above, the first portion 107 of the input lead L1 passes through the first wire passing portion S1 along the left-right direction (first direction), and the second portion 108 extends along the second direction along the front-rear direction (second direction). The two-line section S2 is passed. Therefore, when the input lead L1 is pulled, the pulling force is easily dispersed in the left-right direction and the front-rear direction, so that the possibility of the input lead L1 being detached from the circuit board 51 can be reduced. Furthermore, when the input lead L1 is pulled, the second wall 32e, the third wall 33e, and the fourth wall 34e that form the first wire connection portion S1 and the second wire connection portion S2 (FIG. 1) When the lead L1 is caught on at least one of the reference and the third side wall 33a, the force applied to the lead L1 in the vicinity of the circuit board 51 is reduced. This also reduces the possibility of the input lead L1 coming off the circuit board 51.

  The distance between the through hole 302 and the cover main body 31 b is smaller than the distance between the through hole 302 and the circuit board 51. Therefore, as compared with the case where the distance between through hole 302 and cover main body 31 b is larger than the distance between through hole 302 and circuit board 51, input lead L 1 has a first end 101 connected to circuit board 51. The bending radius in the vicinity (see FIG. 2) can be smaller than the bending radius in the vicinity of the through hole 302. Thereby, the stress of the input lead L1 due to the bending of the input lead L1 in the vicinity of the first end 101 can be reduced. The input lead L 1 of the present embodiment is connected to the circuit board 51 via the board-in connector 52. In other words, bending of the input lead L1 near the first end 101 causes the input lead L1 to come out of the board-in connector 52, or the input lead L1 is fatigue-broken near the first end 101 connected to the board-in connector 52. It is possible to reduce the possibility of The distance between the third side wall 33a of the main body 30 and the board-in connector 52 located around the through hole 302 is the same as the distance between the fourth side wall 34a opposite to the through hole 302 and the board-in connector 52. Greater than distance.

  In addition, the lead wires L1 to L8 are arranged in the vertical direction in the first line portion S1 and the second line portion S2 (see FIG. 1).

  An example of a procedure for assembling the branching device 2 will be described. First, the circuit board 51 to which the lead wires L1 to L8 are connected is held by the body 3a. Next, the lead wires L1 to L8 are pulled out of the body 3a via the region where the through holes 302 are formed. In this state, the cover 3b is coupled to the body 3a. Thus, the lead wires L1 to L8 are pulled out from the inside of the main body 30 through the through holes 302.

  Next, a procedure for attaching the housing 3 to a mounting target will be described with reference to FIGS. Here, the mounting object is the wall of the pipe shaft. The operator screws the screw 46 into a plate material (such as a wood board) attached to the wall of the pipe shaft and then passes the screw 46 through the second hole 42 of the mounting hole 40. Further, the housing 3 is moved to pass the screw shaft of the screw 46 into the first hole 41. Thereby, the housing | casing 3 is attached to the surface of the wall of a pipe shaft through a board | plate material. The operator need not screw the screw 46 into the wall of the pipe shaft. The rear surface 305 of the main body 30 of the housing 3 faces the surface of the wall of the pipe shaft with the plate interposed therebetween.

(1.3) Circuit Configuration of Branching Device As shown in FIG. 7, the circuit mounting board 5 includes a pair of input connection ends E1 and E2, a pair of output connection ends E3 and E4, and a pair of branch connection ends E5, It further includes E6, a pair of termination connection ends E7 and E8, and a termination circuit 7. Hereinafter, the input connection ends E1 and E2, the output connection ends E3 and E4, the branch connection ends E5 and E6, and the termination connection ends E7 and E8 are collectively referred to as connection ends E1 to E8.

  The connection ends E1 to E8 are provided on the circuit board 51 (see FIG. 2) of the circuit mounting board 5. One end (first end 101: see FIG. 2) of a pair of input lead wires L1 and L2 is connected to the pair of input connection ends E1 and E2. One end (first end 101) of the pair of output lead wires L3 and L4 is connected to the pair of output connection ends E3 and E4. One end (first end 101) of the pair of branch lead wires L5, L6 is connected to the pair of branch connection ends E5, E6. One end (first end 111: see FIG. 2) of a pair of termination lead wires L7, L8 is connected to the pair of termination connection ends E7, E8. Thus, one end of each of the lead wires L1 to L8 is connected to the circuit board 51. Each connection end E1 to E8 is configured by, for example, a board-in connector 52 (see FIG. 6). That is, the lead wires L1 to L8 are connected to the circuit board 51 by the board-in connector 52.

  Wirings W1 to W4 are formed on the circuit board 51 (see FIG. 2). The wires W1 to W4 are formed of a conductor printed on the circuit board 51. The wiring W1 electrically connects the input connection end E1 to the output connection end E3. The wire W2 electrically connects the input connection end E2 to the output connection end E4. The wiring W3 branches from the wiring W1, and electrically connects the input connection end E1 to the branch connection end E5 via a signal branching circuit 6 described later. The wiring W4 branches from the wiring W2, and electrically connects the input connection end E2 to the branch connection end E6 via the signal branch circuit 6. Therefore, one end (first end 101: see FIG. 2) of the input lead L1, L2 is the output lead L3, L1 through W4 of the circuit board 51 in the main body 30 (see FIG. 1). It is electrically connected to L4 and branch lead wires L5 and L6.

  The termination circuit 7 performs impedance matching of the circuit formed by the splitter 2. The termination circuit 7 includes a resistor 71 and a capacitor 72. The termination circuit 7 is a series circuit of a resistor 71 and a capacitor 72. The termination circuit 7 is electrically connected between the termination connection ends E7 and E8. The termination circuit 7 is nonpolar. The capacitor 72 is, for example, a nonpolar electrolytic capacitor.

  The termination circuit 7 is electrically isolated from the wires W1 and W2 which form a part of the main line TL1 (see FIG. 8) of the intercom system 1 (see FIG. 8). The termination circuit 7 can be electrically connected to the wires W1 and W2 by connecting the output lead wires L3 and L4 to the termination lead wires L7 and L8.

  Circuit mounting board 5 further includes a signal branching circuit 6. The signal branching circuit 6 includes four capacitors 61 to 64, two resistors 65 and 66, a transformer 67, two surge absorbers 68 and 69, trunk terminals Ta1 and Ta2, and branch terminals Tb1 and Tb2. And. The signal branch circuit 6 is electrically connected to the wires W3 and W4 through the trunk terminals Ta1 and Ta2, and is electrically connected to the branch connection terminals E5 and E6 through the branch terminals Tb1 and Tb2.

  The transformer 67 has a primary winding on the side of the trunk terminals Ta1 and Ta2, and a secondary winding on the side of the branch terminals Tb1 and Tb2. Capacitors 61 and 62 are inserted between both ends of the primary winding of the transformer 67 and the trunk terminals Ta1 and Ta2, and capacitors 63 between the two ends of the secondary winding of the transformer 67 and the branch terminals Tb1 and Tb2, 64 are inserted. The resistors 65 and 66 are inserted between both ends of the primary winding of the transformer 67 and the capacitors 61 and 62.

  The coatings 103 and 113 (see FIG. 2) of the lead wires L1 to L8 are color-coded for each pair of connection ends E1 to E8 corresponding to the lead wires L1 to L8. Specifically, the pair of input lead wires L1 and L2 connected to the pair of input connection ends E1 and E2 have a blue coating. The pair of output lead wires L3 and L4 connected to the pair of output connection ends E3 and E4 have a white coating. The pair of branch lead wires L5 and L6 connected to the pair of branch connection ends E5 and E6 have a yellow coating. The pair of termination leads L7, L8 connected to the pair of termination connections E7, E8 have a black coating. Thus, the sheaths 103 and 113 are provided in pairs for the pair of input connection ends E1 and E2, the pair of output connection ends E3 and E4, the pair of branch connection ends E5 and E6, and the pair of end connection ends E7 and E8. It is a display unit displaying different colors. Thus, the operator can identify the pair of input connection ends E1 and E2, the pair of output connection ends E3 and E4, the pair of branch connection ends E5 and E6, and the pair of end connection ends E7 and E8 for each pair. is there.

(1.4) Configuration of Intercom System As shown in FIG. 8, the intercom system 1 communicates with a plurality of (three in FIG. 8) branching devices 2 and a plurality (three in FIG. 8) dwelling unit terminals 81 And a device 82. Further, the intercom system 1 further includes a shared terminal 83.

  The plurality of dwelling unit terminals 81 are, for example, a plurality of intercom master units installed in the rooms of the plurality of dwelling units. The common terminal 83 is, for example, a lobby intercom slave set installed at a common entrance (lobby) of the collective housing. Communication device 82 relays communication between a plurality of dwelling unit terminals 81 and shared terminal 83. The communication device 82 is installed, for example, in a management room of a housing complex.

  Hereinafter, the plurality of branching devices 2 may be referred to as a first branching device 2, a second branching device 2, and so on. Among the plurality of branching devices 2, the input leads L 1, L 2 of the first branching device 2 (the lowermost branching device 2 in FIG. 8) are connected to the communication device 82. The output leads L3 and L4 of the first branch 2 are connected to the input leads L1 and L2 of the second branch 2 (the central branch 2 in FIG. 8). The output leads L 3, L 4 of the second branch 2 are connected to the input leads L 1, L 2 of the third branch 2. Similarly, in the fourth branching unit 2 and thereafter, a plurality of branching units 2 are sequentially connected by the input lead lines L1 and L2 and the output lead lines L3 and L4. Between the input lead L1 and the communication device 82 connected to each other, between the input lead L2 and the communication device 82 connected to each other, between the input lead L1 and the output lead L3 connected to each other, A wire Wt1 is connected between the input lead L2 and the output lead L4, which are connected to each other. That is, the intercom system 1 further includes a plurality of wires Wt1.

  As described above, the input lead L1, L2, the output lead L3, L4 and the wirings W1, W2 (see FIG. 7) of each of the plurality of branching devices 2 and the plurality of wirings Wt1 constitute the main line TL1. There is. A plurality of branching devices 2 are electrically connected to the communication device 82 by the trunk line TL1.

  The input lead wires L1 and L2, the output lead wires L3 and L4, and the plurality of wires Wt1 are directly connected by caulking using, for example, crimp terminals. The input lead lines L1 and L2, the output lead lines L3 and L4, and the plurality of wires Wt1 may be connected via a terminal block or the like.

  In the branch 2 electrically isolated from the first branch 2 among the plurality of branches 2 (hereinafter referred to as the terminal branch 2), the output leads L3 and L4 of the terminal branch 2 are the terminal branch It is connected to the 2 terminal lead wires L7 and L8. That is, the output connection ends E3 and E4 of the termination branch 2 are electrically connected to the termination circuit 7 (see FIG. 7) via the termination connection ends E7 and E8 of the termination branch 2. Thus, the trunk line TL1 is terminated at the termination circuit 7 of the termination branch 2. In the branching unit 2 of FIG. 7, the output lead wires L3 and L4 are connected to the termination lead wires L7 and L8. The output lead wires L3 and L4 and the termination lead wires L7 and L8 are directly connected by caulking using, for example, crimp terminals. The output lead wires L3 and L4 and the termination lead wires L7 and L8 may be connected via a terminal block or the like.

  Since the termination circuit 7 is nonpolar, the output connection end E3 may be electrically connected to the termination connection end E7, the output connection end E4 may be electrically connected to the termination connection end E8, or the output connection end E3 is terminated. The output connection end E4 may be electrically connected to the connection end E8, and the output connection end E4 may be electrically connected to the end connection end E7.

  The plurality of branching devices 2 correspond to the plurality of dwelling unit terminals 81 on a one-on-one basis. Branch lead wires L5 and L6 of each branching device 2 are connected to the corresponding dwelling unit terminal 81. The communication device 82 is electrically connected to the plurality of dwelling unit terminals 81 via the plurality of branching devices 2. Further, the communication device 82 is electrically connected to the common terminal 83. Thereby, the plurality of branching devices 2 can transmit communication signals between each dwelling unit terminal 81 and the communication device 82.

  A wire Wt2 is connected between the branch lead L5 and the dwelling unit terminal 81 connected to each other, and between the branch lead L6 and the dwelling unit terminal 81 connected to each other. That is, the intercom system 1 further includes a plurality of wires Wt2. The branch lead wires L5 and L6 and the plurality of wires Wt2 are directly connected by caulking using, for example, crimp terminals. The branch lead lines L5 and L6 and the plurality of wires Wt2 may be connected via a terminal block or the like.

  The common terminal 83 receives a call operation by designating a room number of a specific dwelling unit among a plurality of dwelling units. The communication device 82 stores room numbers corresponding to the plurality of dwelling unit terminals 81 one by one. When a call operation is performed on the shared terminal 83, the communication device 82 specifies a dwell unit terminal 81 corresponding to the room number designated in the call operation from among the plurality of dwell unit terminals 81. The communication device 82 transmits a predetermined signal to the dwelling unit terminal 81 corresponding to the room number via the one or more branching devices 2. When the dwell unit terminal 81 receives a predetermined signal, the dwell unit terminal 81 emits a ringing tone for calling a resident. Furthermore, when the resident performs a predetermined operation on the dwell unit terminal 81, the dwell unit terminal 81 and the common terminal 83 can communicate with each other via the one or more branching devices 2 and the communication device 82. The mutual communication between the dwelling unit terminal 81 and the shared terminal 83 is performed by communication signals such as an audio signal and a video signal, for example. Also, as a communication signal, for example, a digital signal is used.

(1.5) Modifications of Embodiment 1 Modifications of Embodiment 1 will be listed below. The following modifications may be implemented in combination as appropriate.

  Inside the main body 30, a configuration for guiding the lead wires L1 to L8 may be further provided. For example, a wall protruding from at least one of the body 3a and the cover 3b may be provided, and the wall may be configured to guide the lead wires L1 to L8. In this case, the wall portion is formed, for example, along a plane orthogonal to the left and right direction, and may guide the lead wires L1 to L8 in the up and down direction and the front and back direction. That is, in the inside of the main body 30, the space between the wall and the third side wall 33a of the body 3a is a wire passing portion for passing a part of the middle portion of the lead wires L1 to L8.

  In other words, in addition to the first wire passing portion S1 and the second wire passing portion S2 which pass a part of the middle portions of the lead wires L1 to L8, another wire passing portion may be provided.

  Further, the termination circuit 7 may include at least one of the resistor 71 and the capacitor 72.

  Further, the lead wires L <b> 1 to L <b> 8 are not limited to being connected to the circuit board 51 by the board-in connector 52. For example, the lead wires L1 to L8 may be connected to the circuit board 51 by connectors of different shapes, or may be directly connected to the circuit board 51 by soldering or the like without using the connectors.

  That is, the configuration of each connection end E1 to E8 is not limited to the board-in connector 52. The configuration of each connection end E1 to E8 may be, for example, a connector of another shape, or a land formed on the circuit board 51 so that the lead wires L1 to L8 can be connected through through holes or the like. May be

  In the end lead wires L7 and L8 of the first embodiment, the coating 113 is peeled off in the first end 111, the exposed portion 1150, and the area from the second end 112 to the exposed portion 1150. Furthermore, in the end lead wires L7 and L8, the tape 116 is wound around a portion other than the first end 111 and the exposed portion 1150 in the portion where the coating 113 is peeled off. On the other hand, in the terminal leads L7 and L8, only the coating 113 of the first end 111 and the coating 113 of the exposed portion 1150 are peeled off, and the coating 113 on the second end 112 is left. May be That is, the terminal leads L7 and L8 may be in a so-called semi-stripped state.

  Further, in each of the lead wires L1 to L6, the core wire 104 of the first end 101 and the core wire of a part (exposed portion) different from the first end 101 and the second end 102, similarly to the termination lead wires L7 and L8. And 104 may be exposed. In this case, each of the lead wires L1 to L6 may be in a semi-stripped state, and like the termination lead wires L7 and L8 of the first embodiment, the second end 102 side of each of the lead wires L1 to L6 is The tape may be wound.

  The branching unit 2 of the first embodiment is a two-wire signal line including a pair of input connection ends E1 and E2, a pair of output connection ends E3 and E4, a pair of branch connection ends E5 and E6, and a pair of end connection ends E7 and E8. Although it is not limited to this, it may be a splitter for 3-wire signal lines. That is, the branching unit 2 may have another connection end in addition to the connection ends E1 to E8. Moreover, the branching device 2 may be provided with another lead wire in addition to the lead wires L1 to L8.

  Further, instead of mutually connecting the connection ends E1 to E8 using the lead wires L1 to L8, for example, the connection ends E1 to E8 may be connected to one another as follows. That is, the connection ends E1 to E8 may be connected to each other using a conductor plate such as a copper plate instead of the lead wires L1 to L8. Further, each branch 2 may be provided with a plurality of connectors electrically connected to the connection ends E1 to E8. Then, a connector electrically connected to the output connection ends E3 and E4 of one branch 2 is connected to a connector electrically connected to the end connection ends E7 and E8 of the branch 2 or another It may be connected to a connector electrically connected to the input connection ends E1 and E2 of the splitter 2. Similarly, also for the connection between the branching device 2 and the communication device 82, and the connection between the branching device 2 and the dwell unit terminal 81 and the communication device 82, instead of using the leads L1 to L8, for example, , A conductor plate or a connector may be used.

  Moreover, in the through holes 302, the lead wires L1 to L8 are not limited to being aligned in one row in the vertical direction. The width in the front-rear direction of the through hole 302 in the first embodiment may be slightly larger than the diameters of the lead wires L1 to L8, but the width in the front-rear direction of the through hole 302 may be further increased. Then, in the through holes 302, the lead wires L1 to L8 may be arranged in the vertical direction and the front-rear direction. Alternatively, in the through holes 302, the lead wires L1 to L8 may be arranged in a line in the front-rear direction.

  Moreover, the main-body part 30 does not need to have the step part 35b. In this case, the width in the front-rear direction of the through hole 302 can be increased as compared to the case where the main body 30 has the step 35 b.

  The display unit displays different colors for each pair of the input connection ends E1 and E2, the pair of output connection ends E3 and E4, the pair of branch connection ends E5 and E6, and the pair of end connection ends E7 and E8. It is not limited to the coating of lead wires L1 to L8. For example, the connection ends E1 to E8 may be configured by terminals provided on a terminal block, and the terminal block may be used as a display unit. That is, the terminal block displays different colors for each pair of the input connection ends E1 and E2, the pair of output connection ends E3 and E4, the pair of branch connection ends E5 and E6, and the pair of end connection ends E7 and E8. do it. Specifically, the input connection ends E1 and E2 are provided on the blue terminal block, the output connection ends E3 and E4 are provided on the white terminal block, and the branch connection ends E5 and E6 are provided on the yellow terminal block, The end connection ends E7 and E8 may be provided on a black terminal block. Alternatively, instead of color-coding the terminal block, the cover of the terminal block may be color-coded. That is, the cover of the terminal block may be used as the display unit. Moreover, not only the terminal block and the cover of the terminal block, but the members provided in the vicinity of each of the connection ends E1 to E8 are a pair of input connection ends E1 and E2, a pair of output connection ends E3 and E4, a pair of branches The connection ends E5 and E6 and the pair of end connection ends E7 and E8 may be color-coded and used as a display unit.

  Also, instead of displaying different colors for each pair on the pair of input connection ends E1 and E2, the pair of output connection ends E3 and E4, the pair of branch connection ends E5 and E6, and the pair of end connection ends E7 and E8 Alternatively, different patterns, characters, figures or symbols may be displayed for each pair. For example, on a member provided in the vicinity of each of the connection ends E1 to E8, such as a coating of the lead wires L1 to L8, a terminal block provided with the connection ends E1 to E8, or a cover of the terminal block It may be attached.

  In short, the display unit displays a different display for each pair of input connection ends E1 and E2, a pair of output connection ends E3 and E4, a pair of branch connection ends E5 and E6, and a pair of end connection ends E7 and E8. Just do it. The display different for each pair is, for example, different colors, patterns, characters, figures or symbols for each pair, or a combination thereof.

  Also, the screw 46 is not limited to a wood screw, and may be another type of screw. For example, screw 46 may be a tapping screw.

  Further, the shape of each configuration of the branching device 2 is not limited to the shape shown in the first embodiment. For example, in the first embodiment, the configuration formed in a rectangular shape may be formed in a square shape. Furthermore, in the first embodiment, the configuration formed in a rectangular parallelepiped shape may be formed in a cube shape.

(1.6) Summary of Embodiment 1 As described above, the branching device 2 according to this embodiment includes the box-shaped main body 30, the pair of input lead wires L1 and L2, and the pair of output lead wires L3. , L4, and a pair of branch lead wires L5, L6. One end (first end 101) of the pair of input leads L1 and L2 is located inside the main body 30, and the other end (second end 102) is located outside the main body 30. One end (first end 101) of the pair of output lead wires L3 and L4 is electrically connected to the pair of input lead wires L1 and L2 inside the main body 30, and the other end (second end 102) is the main body portion Located outside of 30. One end (first end 101) of the pair of branch lead wires L5 and L6 is electrically connected to the pair of input lead wires L1 and L2 inside the main body 30, and the other end (second end 102) is the main body Located outside of 30. Each of the pair of input leads L1 and L2, the pair of output leads L3 and L4, and the pair of branch leads L5 and L6 is a first portion 107 which is a part of the intermediate portion 105 between one end and the other end. And a second portion 108 which is a part of the intermediate portion 105 other than the first portion 107. The branching unit 2 includes a first line portion S1 and a second line portion S2. A first portion 107 of the pair of input lead wires L1 and L2, the pair of output lead wires L3 and L4, and the pair of branch lead wires L5 and L6 are passed along the first direction in the first wire connection portion S1. . In the second line portion S2, a second direction in which the second portions 108 of the pair of input leads L1, L2, the pair of output leads L3, L4 and the pair of branch leads L5, L6 intersect the first direction It is passed along.

  According to the above configuration, the first portion 107 of the intermediate portion 105 in the pair of input leads L1, L2, the pair of output leads L3, L4 and the pair of branch leads L5, L6 (leads L1 to L6) Is passed through the first wire passing portion S1 along the first direction, and the second portion 108 is passed through the second wire passing portion S2 along the second direction. The first direction and the second direction intersect with each other. Therefore, when a force is applied to the lead wires L1 to L6 by pulling or the like, the force applied to the lead wires L1 to L6 is likely to be dispersed in the first direction and the second direction. Thereby, compared with the case where the first direction and the second direction are the same direction, the lead wires L1 to L6 can be separated from the place where one end (first end 101) of the lead wires L1 to L6 is connected Can be reduced.

  Further, in the branching unit 2 according to the present embodiment, in each of the pair of input lead wires L1 and L2, the pair of output lead wires L3 and L4, and the pair of branch lead wires L5 and L6, the intermediate portion 105 is a first portion It is preferable to bend outside the main body 30 between 107 and the second portion 108.

  According to the above configuration, the design of the internal shape of the main body portion 30 as compared to the case where the intermediate portion 105 is bent between the first portion 107 and the second portion 108 not inside the external portion of the main body portion 30 but inside You can increase your freedom.

  Further, in the branching unit 2 according to the present embodiment, it is preferable that the through hole 302 be formed in the main body portion 30. The through hole 302 constitutes at least a part of the first line portion S1. The splitter 2 preferably further includes a wall (third wall 33e). The wall portion is disposed at a position facing the opening surface of the through hole 302 at the outside of the main body portion 30, and forms a second wire connection portion S2 with the main body portion 30.

  According to the above configuration, the wall portion (third wall portion 33e) faces the opening surface of the through hole 302, whereby the internal configuration of the main body portion 30 at the back of the through hole 302 (lead wires L1 to L6, etc.) Can be protected.

  Moreover, in the branching device 2 which concerns on this embodiment, it is preferable to further provide the circuit board 51. FIG. The circuit board 51 is held inside the main body 30, and the wirings W1 to W4 are formed. One end (first end 101) of each of the pair of input lead wires L 1 and L 2, the pair of output lead wires L 3 and L 4, and the pair of branch lead wires L 5 and L 6 is connected to the circuit board 51. The pair of input lead wires L1 and L2 are electrically connected to the pair of output lead wires L3 and L4 and the pair of branch lead wires L5 and L6 via the wires W1 to W4 of the circuit board 51.

  According to the above configuration, the pair of input lead wires L1 and L2 are electrically connected to the pair of output lead wires L3 and L4 and the pair of branch lead wires L5 and L6 via the wires W1 to W4 of the circuit board 51. It is done. Therefore, compared with the case where the pair of input leads L1, L2 are directly connected to the pair of output leads L3, L4 and the pair of branch leads L5, L6, the pair of input leads L1, L2 and the pair of outputs Electrical connection with the lead wires L3 and L4 and the pair of branch lead wires L5 and L6 can be easily realized.

  Further, the intercom system 1 according to the present embodiment includes a plurality of branching devices 2. The intercom system 1 further includes a plurality of dwell unit terminals 81 and a communication device 82. The plurality of dwelling unit terminals 81 are electrically connected to the plurality of branching devices 2. The communication device 82 is electrically connected to the plurality of dwelling unit terminals 81 via the plurality of branching devices 2 and communicates with the plurality of dwelling unit terminals 81.

  According to the above configuration, when a force is applied to the lead wires L1 to L6 by pulling or the like, the force applied to the lead wires L1 to L6 is dispersed in the first direction and the second direction intersecting the first direction. It is easy to be done. Thereby, compared with the case where the first direction and the second direction are the same direction, the lead wires L1 to L6 can be separated from the place where one end (first end 101) of the lead wires L1 to L6 is connected Can be reduced.

(2) Embodiment 2
Next, the branching unit 2a according to the second embodiment will be described with reference to FIGS. About the same composition as Embodiment 1, the same numerals are attached and explanation is omitted.

  The branching unit 2a of the second embodiment can be used in place of the branching unit 2 (see FIG. 8) of the intercom system 1 (see FIG. 8) of the first embodiment.

(2.1) External Shape of Branching Device In the branching device 2a, the housing 9 corresponds to the housing 3 of the first embodiment, but the shape is different from that of the housing 3.

  The housing 9 has a main body 90. In the present embodiment, the main body 90 constitutes the whole of the housing 9. Body portion 90 includes a body 9a and a cover 9b coupled to body 9a. Since the cover 9b has the same shape as the body 9a, the description of the cover 9b will be appropriately omitted below. In addition, the cover 9b is arrange | positioned in the direction rotated 180 degrees with respect to the body 9a.

  The body 9a is formed in a box shape (rectangular shape) in which an opening 90a is formed on one surface. The body 9a includes a plate-like facing portion 95a and first, second, third and fourth side walls 91a, 92a, 93a and 94a. The opening 90a is formed in a region facing the facing portion 95a. The first, second, third and fourth side walls 91a, 92a, 93a and 94a protrude from the periphery of the facing portion 95a along the thickness direction of the facing portion 95a. The first side wall 91a and the second side wall 92a face each other, and the third side wall 93a and the fourth side wall 94a face each other.

  The body 9a further includes two holding portions 96a that project from the facing portion 95a toward the opening 90a along the thickness direction of the facing portion 95a. Each holding portion 96 a has a base 961 and four ribs 962. The base 961 and each rib 962 are formed in a plate shape. The base 961 of one of the two holding parts 96a faces the first side wall 91a, and the base 961 of the other holding part 96a faces the second side wall 92a. In each holding portion 96 a, four ribs 962 protrude from the base 961 along the thickness direction of the base 961.

  The circuit board 51 of the circuit mounting board 5 is held so as to be sandwiched between the two ribs 962 of one holding portion 96 a of the body 9 a. Furthermore, the circuit board 51 is held so as to be sandwiched between the two ribs 962 of the other holding portion 96a of the body 9a. Furthermore, the circuit board 51 is similarly held by the cover 9b so as to be sandwiched between the two ribs in each of the two holding portions.

  Body 9a further includes hooking portion 97a and hooking claw 98a. The hooking portion 97a is formed in a square tube shape and protrudes from the first side wall 91a. That is, a passing hole 970a which is a through hole is formed in the hooking portion 97a. The hooking claw 98a is formed in a hook shape. Similarly, the cover 9b also includes a hooking portion 97b in which the passage hole 970b is formed and a hooking claw 98b.

  The cover 9b is coupled to the body 9a as follows. The hooking claw 98a of the body 9a is passed through the passage hole 970b of the cover 9b and hooked on the hooking portion 97b of the cover 9b. Further, the hooking claw 98b of the cover 9b is passed through the passage hole 970a of the body 9a and hooked on the hooking portion 97a of the body 9a.

  A through hole 950 is formed in the facing portion 95a of the body 9a. The through hole 950 is formed at the corner of the rectangular facing portion 95a. The through hole 950 penetrates the facing portion 95 a in the thickness direction.

  A through hole 951 connected to the through hole 950 is formed in the second side wall 92 a. The through hole 951 penetrates the second side wall 92 a in the thickness direction.

  Further, the through hole 954 and the through hole 955 similar to the through hole 950 and the through hole 951 of the body 9a are also formed in the cover 9b.

(2.2) Arrangement of Lead Wires Next, the arrangement of the lead wires L1 to L8 in the branching unit 2a will be described. In FIGS. 9 and 10, only the input lead L1 and the termination lead L7 among the leads L1 to L8 are shown in order to simplify the drawing. In the following description, only the arrangement of the input lead L1 will be described, but the leads L1 to L8 are similarly arranged.

  The first end 101 of the input lead L 1 is connected to the circuit board 51 via the board-in connector 52. The input lead L 1 extends from the circuit board 51 and passes through the through hole 951. That is, the second end 102 of the input lead L 1 is drawn out of the main body 90 through the through hole 951. An intermediate portion 105 between the first end 101 and the second end 102 of the input lead L1 is a space which is a space inside the wire passing portions S3 and S4 and the through hole 951 in the main body portion 90. The line portion S5 is passed.

  The wire passing portion S3 is a space between the rib 962 of the holding portion 96a and the third side wall 93a in the space inside the body 9a of the main body portion 90. That is, the line portion S3 is a space along the vertical direction of the drawing of FIG. The predetermined portion 203 of the intermediate portion 105 of the input lead L1 is guided by the rib 962 and the third side wall 93a to pass through the line portion S3 in the vertical direction of the drawing.

  The wire passing portion S4 is a space between the base 961 of the holding portion 96a and the second side wall 92a in the space inside the body 9a of the main body 90. That is, the wire passing portion S4 is a space along the left-right direction of the drawing which intersects the vertical direction of the drawing of FIG. The predetermined portion 204 of the middle portion 105 of the input lead L1 is guided by the base portion 961 and the second side wall 92a to pass through the line portion S4 along the left-right direction in the drawing.

  The line portion S5 is a space along the vertical direction in the drawing which intersects the horizontal direction in the drawing of FIG. The predetermined portion 205 of the intermediate portion 105 of the input lead L1 is guided by the second side wall 92a around the through hole 951 in the through hole 951, so that the wire passing portion S5 extends in the vertical direction of the drawing. Passed through. The second end 102 of the input lead L1 is drawn, for example, downward in the drawing from the line portion S5.

  The wire passing portion S3 and the wire passing portion S4 are connected to each other and intersect at the inside of the main body portion 90. That is, the wire passing portion S3 and the wire passing portion S4 intersect between the body 9a and the cover 9b. Further, the wire passing portion S4 and the wire passing portion S5 are connected to each other, and intersect in the inside of the main body portion 90. That is, the wire passing portion S4 and the wire passing portion S5 intersect between the body 9a and the cover 9b. Therefore, the middle portion 105 of the input lead L1 bends inside the main body 90 by passing through the wire portions S3, S4, S5.

  Thus, the middle portion 105 of the input lead L1 extends in the vertical direction in the drawing in the line portions S3 and S5, and extends in the horizontal direction in the drawing in the line portion S4. Therefore, when the input lead L1 is pulled, the pulling force is easily dispersed in the vertical direction and the left and right direction, so that the possibility of the input lead L1 being detached from the circuit board 51 can be reduced. Furthermore, when the input lead L1 is pulled, at least one of the rib 962, the third side wall 93a, the base 961, the second side wall 92a, and the second side wall 92a forming the wire connection portions S3, S4 and S5. When the lead wire L1 is hooked, the force applied to the lead wire L1 in the vicinity of the circuit board 51 is reduced. This also reduces the possibility of the input lead L1 coming off the circuit board 51.

  The line portions S3, S4, and S5 respectively correspond to a first line portion or a second line portion. When the wire-line portion S3 is viewed as a first wire-line portion and the wire-line portion S4 is viewed as a second wire-line portion, the predetermined portion 203 which is passed through the first wire-line portion 1 Pass through the line. The predetermined portion 204 which is passed through the second wire-line portion is passed through the second wire-line portion along the left-right direction of the drawing which intersects the vertical direction of the drawing. In addition, the first wire connection portion and the second wire connection portion are located inside the main body portion 90. More specifically, the first line portion and the second line portion are formed between the body 9a and the cover 9b.

  Further, when the wire passing portion S4 is viewed as a first wire passing portion and the wire passing portion S5 as a second wire passing portion, the predetermined portion 204 which is passed through the first wire passing portion extends in the left-right direction of FIG. A predetermined portion 205 which is passed through the first wire passing portion and passed through the second wire passing portion is passed through the second wire passing portion along the vertical direction in the drawing which intersects the paper horizontal direction.

  Since the body 9a and the cover 9b have the same shape, the same configuration as the rib 962 for guiding the middle portion 105 of the input lead L1, the third side wall 93a, the base 961, the second side wall 92a and the through hole 951 is formed on the cover 9b. It is done. That is, the cover 9b also has the line portions S3, S4, and S5. Therefore, the operation of passing the middle portion 105 of the input lead L1 through the line portions S3, S4, S5 can be performed on the body 9a or the cover 9b. Further, the operation of passing the middle portion 105 of the input lead L1 through the line portions S3, S4 and S5 can be performed even before the cover 9b is joined to the body 9a.

  An example of a procedure for assembling the branching device 2 will be described. First, the circuit board 51 to which the first end 101 of the input lead L1 is connected is held by the body 9a. Next, the middle portion 105 of the input lead L1 is passed through the line portions S3 and S4. Furthermore, the second end 102 of the input lead L1 is pulled out of the through hole 951 to the outside of the body 9a. In this state, the cover 9b is coupled to the body 9a. As a result, the input lead L1 is pulled out from the inside of the main body 90 through the through hole 951. The circuit board 51 may be held by the cover 9b, and the input lead L1 may be pulled out of the through hole 955 of the cover 9b to the outside of the cover 9b.

  The input lead L2, the output leads L3 and L4, the branch leads L5 and L6, and the termination leads L7 and L8 are also passed through the line portions S3, S4 and S5 in the same manner as the input lead L1. Note that among the lead wires L1 to L8, a part of the lead wires is drawn from the through hole 951 of the body 3a to the outside of the main body 90, and the remaining lead is from the through hole 955 of the cover 3b to the outside of the main body 90 You may pull it out.

  Also, instead of the through holes 951, some or all of the lead wires L1 to L8 may be passed through the through holes 950. That is, the space inside the through hole 950 may be a through wire portion. Similarly, instead of the through holes 955, some or all of the lead wires L1 to L8 may be passed through the through holes 954. That is, the space inside the through hole 954 may be a through wire portion.

(2.3) Modified Example of Second Embodiment A modified example of the second embodiment will be described below.

  Instead of the base 961 and the rib 962, one or more pins may be provided inside the main body 90. Then, the leads L1 to L8 may be guided by the pins. That is, the line portions S3 and S4 may be formed by pins. For example, in FIG. 10, the base portion 961 of the holding portion 96a is omitted, and a plurality of ribs 962 are used as pins to lead in a wire passing portion which is a space between a plurality of pins and the third side wall 93a and the second side wall 92a. It may be through the lines L1 to L8. Alternatively, the lead wires L1 to L8 may pass through a wire passing portion which is a space between a plurality of pins.

(2.4) Summary of Embodiment 2 As described above, in the branching unit 2a according to this embodiment, the first wire connection portion (for example, the wire connection portion S3) is located inside the main body portion 90.

  According to the above configuration, as compared with the case where the first line portion (e.g., the line portion S3) is located outside the main body 90, the freedom of design of the outer shape of the main body 90 can be enhanced.

  Further, in the branching unit 2a according to the present embodiment, the main body portion 90 preferably includes a body 9a and a cover 9b. The cover 9b is coupled to the body 9a. It is preferable that the first wire passing portion (for example, the wire passing portion S3) and the second wire passing portion (for example, the wire passing portion S4) be formed between the body 9a and the cover 9b.

  According to the above configuration, in a state in which the body 9a and the cover 9b are disassembled, the lead wires L1 to L1 are connected to the first wire passing portion (eg, the wire passing portion S3) and the second wire passing portion (eg, the wire passing portion S4). The middle portion 105 of L6 can be passed through. Therefore, it is easy to pass the middle portion 105 of the lead wires L1 to L6 through the first wire connection portion and the second wire connection portion as compared with the case where the main body portion 90 is composed of one undegradable member.

  Each embodiment mentioned above may be realized combining suitably including a modification.

1 intercom system 2, 2a branching device 30, 90 main body 9a body 9b cover 33e third wall (wall)
51 circuit board 81 dwelling unit terminal 82 communication device 101 first end (one end)
102 second end (other end)
105 intermediate portion 107 first portion 108 second portion 302 through hole L1, L2 input lead L3, L4 output lead L5, L6 branch lead S1 first wire portion S2 second wire portion

Claims (7)

A box-like main body,
A pair of input lead wires having one end located inside the main body and the other end located outside the main body;
A pair of output lead wires of which one end is electrically connected to the pair of input leads inside the main body and the other end is located outside the main body;
And a pair of branch lead wires whose one end is electrically connected to the pair of input leads inside the main body and whose other end is located outside the main body,
Each of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires is a first portion including a part of an intermediate portion between the one end and the other end, and the intermediate portion And a second part consisting of a part other than the first part.
A first line portion through which the first portion of the pair of input leads, the pair of output leads, and the pair of branch leads pass along a first direction;
A second line portion through which the second portion of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires intersects the first direction; Contains branchers. In each of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires, the intermediate portion is bent outside the main body portion between the first portion and the second portion. The branching device according to claim 1. The main body portion is formed with a through hole which constitutes at least a part of the first line portion,
The branching device according to claim 2, further comprising: a wall portion which is disposed at a position facing the opening surface of the through hole outside the main body portion and which forms the second wire connection portion with the main body portion. The branching unit according to claim 1, wherein the first line portion is located inside the main body portion. The body portion includes a body and a cover coupled to the body,
The branching device according to claim 4, wherein the first line portion and the second line portion are formed between the body and the cover. It further comprises a circuit board held in the inside of the main body and having a wiring formed thereon,
The one end of each of the pair of input lead wires, the pair of output lead wires, and the pair of branch lead wires is connected to the circuit board,
The pair of input lead wires are electrically connected to the pair of output lead wires and the pair of branch lead wires through the wiring of the circuit board. Branch of. A plurality of branching devices according to any one of claims 1 to 6,
A plurality of dwelling unit terminals electrically connected to the plurality of branching devices;
An intercom system, further comprising: a communication device electrically connected to the plurality of dwelling unit terminals via the plurality of branching devices and communicating with the plurality of dwelling unit terminals.

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