JPH0583066B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a branch cover, a method for manufacturing the same, and a manufacturing device for the same. Regarding branch covers that improve safety and reliability by electrically, mechanically, and chemically protecting the cable branch connections that connect to the connection terminals of the The present invention relates to a method for manufacturing a branch cover that can be easily manufactured without requiring any work, and an apparatus for manufacturing the branch cover.

[Conventional technology]

The conventional cable used for in-house wiring is a flat 2- to 3-core 600V vinyl insulated vinyl sheathed cable. When connecting this cable to a lighting socket, wall outlet, etc., peel off the vinyl sheath of the cable by a specified length to expose the vinyl insulated wire core, and then peel off the vinyl insulation of the vinyl insulated wire core by a specified length. The exposed conductor was connected to each connection. No covering is provided over the exposed connections and vinyl insulated wire cores. Recently, connections and vinyl insulated wire cores have been covered with electrical, mechanical, and chemical protection for safety reasons such as fire prevention and aging prevention. Proposals have been made to provide a covering over the vinyl insulated wire core.

This proposal is shown in FIGS. 6a and 6b. In Figure a, the outer periphery of the exposed vinyl insulated wire core 22 has an inner diameter that matches the wire core diameter, and the thickness is 0.4~
A 0.8 mm vinyl insulating tube 50 is fitted onto each tube, and the vinyl insulating tube 50 and the vinyl sheath 21 are fixed by winding an insulating adhesive tape several times. In addition, b is 2 in the large diameter tube 60.
Insert the single tube 64 of the book, and
The large-diameter tube 60 and the single tube 64 are integrated by applying adhesive to the outer circumference of the tube 60, and the cable 20 shown in FIG. 6a is inserted from the open end side of the large-diameter tube 60. Single tube 64
The cable core 22 is inserted into the large-diameter tube 60, and the cable sheath 21 is inserted into the large-diameter tube 60. If necessary, an insulating adhesive tape is wound around the large-diameter tube 60 several times to fix it. According to these methods,
Since the exposed connections and the vinyl insulated wire core 22 are covered with a covering such as a vinyl insulating tube, they can be electrically, mechanically and chemically protected, preventing fire and cable aging. can.

[Problem that the invention attempts to solve]

However, the conventional branch connection cover has the following disadvantages.

(1) According to the branch cover shown in FIG. 6a, a single vinyl insulation tube 50 is fitted over each wire core 22, the exposed base of the wire core 22 is grasped, and an insulating adhesive tape is attached to the vinyl insulation tube 50. In order to fix the tube 50 by wrapping it several times on the vinyl sheath 21, the vinyl insulating tube 5
The work of fitting the tube 50 and the wire core 22 to each other is troublesome, and the work of holding the tube 50 and the core 22 to prevent them from being misaligned, winding the insulating adhesive tape, etc. is troublesome. Furthermore, if the wound tape deteriorates, safety will decrease.

(2) According to the branch cover shown in FIG. 6b, when inserting the cable 20 from the large diameter tube 60, the wire core 22 gets caught on the single tube 64 inserted into the large diameter tube 60, making insertion difficult. Also,
Since the large diameter tube 60 and the single tube 64 are fixed with adhesive, the large diameter tube 60
Also, dirt is generated inside and outside the single tube 64. Furthermore, a large diameter tube 60 and a single tube 6
A gap occurs between the adjacent parts of 4, and the work of squeezing the gap and bonding is troublesome.

Therefore, an object of the present invention is to provide a branch that can be easily fitted into the sheath and cable core of a cable branch connection part, that can safely protect the cable core and the cable connection part, and that has improved reliability. It is to provide cover.

Another object of the present invention is to provide a branch cover that can omit troublesome operations such as winding tape and applying adhesive for fixing.

Another object of the present invention is to provide a method and apparatus for manufacturing a branch cover that can easily produce a branch cover that is stable in shape and size without requiring complicated operations.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention uses one end of a tube made of thermoplastic plastic or the like as an original part, and welds required parts of the tube from the original part to the other end to form a plurality of branched tubes. The present invention provides a branch cover.

That is, the branch cover of the present invention includes the following means.

(1) Original tube part This is the unprocessed part of a tube made of thermoplastic plastic, etc., cut to a predetermined length and not welded, molded, etc. The original tube portion is where the sheath of the cable is fitted, and its inner diameter is approximately equal to the outer diameter of the cable. Therefore, misalignment between the cable and the original tube can be easily prevented.

(2) Branch tube This is a tube that is formed from the aforementioned tube original part to the other end via a welded part, and is fitted into the cable core and its connection part. The inner diameter of this branch tube is approximately 1/2 of the inner diameter of the original tube portion described above, and is equal to the outer diameter of the cable core to be inserted, so that displacement of the inserted cable can be prevented. In addition, separating the branch tube at the welded part makes it possible to move the branch tube in a predetermined direction, improving work efficiency when connecting the inserted cable core and branch connection part to a predetermined connection terminal, etc. can be improved.

The above method for manufacturing a branch tube includes the steps of cutting a tube made of thermoplastic plastic or the like into a predetermined length, and a plurality of cylindrical rods arranged in parallel at a predetermined interval on a lower jig. fitting the tube cut to the predetermined length onto the outer periphery of the tube until it abuts a fixed plate to which the cylindrical rods are fixed, and lowering the tube onto the lower jig on which the plurality of cylindrical rods are arranged. The upper jig is fitted to hold the tube fitted on the outer periphery of the plurality of cylindrical rods so as to follow the shape of the plurality of cylindrical rods, and the upper jig is provided on the upper jig and the lower jig. sandwiching the tube fitted around the outer periphery of the plurality of cylindrical rods between adjacent portions of the cylindrical rods by means of electrodes held together; applying a high frequency voltage to the electrodes holding a part of the tube; The method includes a step of welding a part of the tube to form a branch tube, and a step of extracting the tube having the plurality of formed branch tubes from the cylindrical rod. Further, if necessary, an electrode having a protruding portion on one side and an electrode having an insulating material with a small relative dielectric constant on the other side may be provided, and the tube may be fitted around the outer periphery of the plurality of cylindrical rods. By sandwiching a part of the branch tube and applying a high-frequency voltage, it is possible to form a small-diameter single tube in which the welded portion of the branch tube is separated by a predetermined length.

Further, the branch tube manufacturing apparatus of the present invention includes the following means.

(1) Fixing means A plurality of cylindrical rods are arranged in parallel at predetermined intervals on the lower jig, and a tube is fitted onto the outer periphery of the plurality of cylindrical rods and fixed. This rod will serve as the mold for the branch tube that will be molded later.
The branch tube is molded along the shape of this cylindrical rod. When adding more cylindrical rods, the number of branch tubes also increases accordingly.

(2) Holding means Holds a portion of the tube fitted around the outer periphery of the plurality of cylindrical rods in the longitudinal direction. For example, this is composed of a descending upper jig and a fixed lower jig, and when the upper jig descends toward the lower jig, the The tube holder holds the tubes fitted around the outer peripheries of the plurality of cylindrical rods placed on the lower jig so as to follow the shape of the cylindrical rods, and also holds the plurality of tubes on the upper and lower jigs. A portion of the tube is longitudinally clamped between adjacent portions of a plurality of cylindrical rods by protruding electrodes located between the bodies.

(3) Welding means A high-frequency voltage is applied to electrodes provided on the upper jig and the lower jig. A high frequency power source is connected to this electrode, and a part of the tube held between the electrodes in the longitudinal direction is connected to, for example,
When a voltage with a frequency of 40 MHz is applied for 0.1 to 0.3 seconds, the sandwiched parts generate heat and weld.

(4) Separation means Separation means separates the branch tube branched via the weld part by a predetermined length to form a small diameter single tube. In this method, a protrusion is provided on a part of the electrode of the upper jig, and an insulating material with a small dielectric constant is provided on the electrode of the lower jig. When a part of the tube fitted around the outer periphery of a cylindrical rod is held between electrodes and a high frequency voltage is applied to the held part, a small diameter single tube is formed at the part where the protrusion and the insulating material abut. be done. That is, an electrode is located below the insulating material, and a high frequency electric field is generated between the protrusion and the electrode while avoiding the insulating material. At this time,
The electric field concentrates on the tube on both sides of the insulating material and melts the tube. Since a pressing force is applied to the protrusion, the protrusion is cut by the pressing force and shaped into a circular shape along the tube holder.

[Effect]

When the tube is fitted around the outer periphery of multiple cylindrical bars on the lower jig and the upper jig is lowered toward the lower jig, the tube holder holds the tube along the multiple cylindrical bars. At the same time, a portion of the tube is held between adjacent portions of the cylindrical rod in the longitudinal direction by the upper and lower electrodes. When a high frequency voltage is applied to both electrodes, the sandwiched portions of the tube generate heat and weld together, producing a branch cover. Since the branch cover is molded while being held by the tube holder, the shape and dimensions of the branch cover are stable, and since it is welded by high frequency voltage, the work is easy and the work time can be shortened.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the branch cover of this invention, its manufacturing method, and its manufacturing apparatus are demonstrated in detail.

Figures 1a, b, and c show an embodiment of the present invention,
In Figure a, one end has a tube original part 11 of a predetermined length, and the other end has a branch part 14 having an inner hole 13 of approximately 1/2 the inner diameter of the tube original part 11 via a welded part 12. It is formed. This tube is selected from thermoplastic plastics, such as vinyl chloride resin, and is made of a material of a class applicable to the sheath or insulation of electric wires and cables, and the wall thickness is
It is molded around 0.4mm to 1.0mm. Also, Figure b
is a welded part 12 separated by a predetermined length, and for example, even if the terminals are far apart in the connection part for a lighting device or the connection part for a wall outlet, it is easy to connect the cable core. . That is, the tip of the branch portion 14 is a small-diameter single tube 14a. Further, Figure c shows a two-core flat cable housed within the branch cover 10 shown in Figures a and b. When storing the flat cable 20 in the branch cover 10 shown in FIG.
inner diameter 14φ, tube length 300mm, tube original part 11 length 50mm, welded part 12 length 250mm,
The welded portion 12 is formed to have a thickness of 0.6 to 0.8 mm and a welded width of approximately 1.0 mm, and a predetermined length of the outer sheath 21 of the cable 20 is peeled off, and the exposed tip of the wire core 22 is attached to the tube original shape portion 11.
By inserting the wire core 22 into the branch tube 14 and the cable sheath 21 into the original tube portion 11. At this time, since a connecting terminal (not shown) is connected to the core conductor after insertion, the branch tube does not come off toward the connecting terminal, and the welded portion 12 prevents the branch tube from moving toward the cable sheath 21 side. On the other hand, the tube original portion 11 and the cable sheath 21 may be adhered to each other by applying an adhesive to the sheath 21 before insertion, and an insulating adhesive tape may be wound several times as necessary.

FIGS. 2a and 2b show an example of a three-core flat cable 20, and the branch cover 10 has three small-diameter single tubes 14a according to the number of cores of the cable 20. In this case as well, each cable core 22 is connected to each small-diameter single tube 14 as described above in FIGS. 1a, b, and c.
Insert into a.

The branch cover 10 described above has the tube original shape 11 at one end and the small diameter single tube 14a with the welded part 12 separated at the other end, so it is easy to insert the cable, and the tube original shape is Since the inner diameter of the portion 11 and the outer diameter of the cable sheath 21 are equal, and the inner diameter of the inner hole 13 of the small-diameter single tube 14a and the outer diameter of the cable core 22 are equal, the cable 20 and the branch cover 10 have the predetermined dimensions. The cable is inserted and mated, eliminating any misalignment with the cable.
Also, since there are few components, construction is easy.

Figures 3a and b are the branch cover 1 shown in Figure 1a.
0, and 100 is a jig that is pressed and lowered, and has an electrode 101 made of brass with a thickness of 1.0 to 2.0 mm, and tube holders 102 attached to both sides of the electrode 101. A semicircular recess is formed at the tip of the tube holder 102, and is made of an electrical insulator, for example, a molded plate of phenol resin or the like. Electrode 101 is tube holder 1
0.3 to 1.0 from the protrusion 103a of the recess 103 of 02
It protrudes by about mm. When the tube holder 102 is attached to both sides of the electrode 101, an elastic mechanism is provided as shown in FIG. 3b. This elastic mechanism separates a fixed body 104 that is fixed to the electrode 101 and a holding body 105, and a coiled spring 106 is interposed between them. Therefore, the coiled spring 106 generates an elastic force in the holding body 105. This lowering jig is fixed to one electrode (upper electrode) of the high frequency wilder. The other jig 200 has an electrode 202 made of brass or the like having a thickness of 1.0 to 2.0 mm placed vertically on a flat plate 201 made of brass or the like, and tube holders 203 are provided on both sides of the electrode 202. . Tube holder 20
3 is the tube holder 1 of the aforementioned lowering jig 100.
Same shape and material as 02. Guide portions 2 are provided on both sides of the tube holder 203 to prevent the branch tube 10 from protruding from the concave portion of the tube holder 203 during welding and forming the branch tube, which will be described later.
04 is provided, and two cylindrical rods 205 are provided on the recessed portion of the tube holder 203 holding the electrode 202 therebetween. This cylindrical rod 205 is arranged so that the center of the cylindrical rod 205 is at the center of a perfect circle formed by the recess 103 of the tube holder 102 and the recess of the tube holder 203, and One end is open, and the other end is fixed to a fixed plate 206 fixed perpendicularly to the flat plate 201. Further, the outer circumferential dimension of the cylindrical rod 205 arranged in parallel is the same as the inner circumferential dimension of the tube 50. In order to facilitate fitting of the tube 50 and removal after welding and molding, a fluororesin coating may be provided on the outer periphery of the cylindrical rod 205. Furthermore, if you want to have a plurality of branch parts 14, for example, if you want to branch into three, you can use three cylindrical rods and fit the tubes therein, and provide the corresponding number of tube holders and electrodes. .

Figures 4a and 4b show jigs 100 and 200 used when welding and forming the branch cover shown in Figure 1b.
, welded part 1 of branch part 10 of branch cover 10
2 is welded to a predetermined length and separated to form a small-diameter single tube. The electrode 101 of the jig 100 has a protrusion 110 with a thickness of 0.2 to 0.5 mm that protrudes by 0.2 to 0.5 mm, and its length is adapted to the length of the small diameter single tube 14a. . Further, an insulating material 210 is provided on a part of the electrode 202 of the jig 200 at a position that matches the protrusion 110 of the electrode 101 of the jig 100, and the insulating material 210 is slightly higher than the electrode 202. ing. Further, the electrode 202 located below the insulating material 210 is exposed on the side surface of the recess of the tube holder 203. This insulating material 210 is made of a resin that does not generate heat upon application of a high-frequency voltage by a high-frequency wilder, that is, a material that exhibits small values of relative dielectric constant (ε) and dielectric loss tangent (tan δ), such as a fluorine-based resin. Furthermore, when the tube is branched into three or more tubes, two or more sets of the protruding portions 110 and insulating materials 210 of the jigs 100 and 200 may be prepared and provided at the portions of the welded portion that are desired to be separated. Note that the jig 100 in b also has the elastic mechanism described above in FIG. 3b, and
A cylindrical rod 205 is also provided, but is not shown.

The method for manufacturing the branch cover will be described below.

(1) Branch cover 10 where welded part 12 is not separated
Manufacturing method A tube 50 is made by extruding a tube made of thermoplastic vinyl chloride resin or the like to have an inner diameter of 14φ and an outer diameter of 16φ and cutting it into a predetermined length.
is fitted from the open side of the cylindrical rod 205 of the jig 200 of the manufacturing apparatus shown in FIGS. 3a and 3b, and pushed in until one end abuts against the fixing plate 206 fixing the cylindrical rod 205. Due to this fitting, the tube 50 is attached to the jig 2.
00. At this time, a portion corresponding to the tube original shape portion 11 is disposed apart from the cylindrical rod 205. When the tube 50 is placed on the jig 200, the jig 100 provided on the jig 200 is lowered toward the jig 200. By lowering the jig 100, the electrode 101 is placed on the electrode 202, and the tube holder 102 is placed on the tube holder 203 along the cylindrical rod 205.
A portion of the tube 50 fitted into the tube 50 is sandwiched between the electrode 101 and the electrode 202 while along the cylindrical rod 205, and a portion of the tube 50 is pressed against the inner peripheral surface. After this, the high frequency power of the high frequency wilder is turned on, and the frequency is set between both electrodes 101 and 202.
Apply high frequency voltage at 40MHz, output 2.0KW.
The high frequency voltage was applied for 0.1 to 0.3 seconds, and both electrodes 10
The tube held between the tubes 1 and 202 is made to generate heat.
A pressing force of 2.0 to 4.0 Kg/cm ² is applied to both electrodes 101 and 202.
pressure is applied to the clamping part, and the clamping part is welded and formed. At this time, the tube holder 1 of the jig 100
02 is provided with a holder 105 having an elastic mechanism, so even if there are variations in the outer diameter and thickness of the tube, it can be absorbed.
When the welding process is completed, the upper electrode of the high frequency wilder to which the jig 100 is fixed is raised, and the cylindrical rod 2
Pull out the branch cover 10 manufactured from 05,
Manufacture of branch cover ends.

Next, the principle of welding using a high frequency wilder will be explained using FIG.

A dielectric (insulator) 44 is connected to two flat electrodes 41,
42 and when a high frequency voltage V is applied from the high frequency power supply 40, the molecules 43 in the dielectric 44 form a dipole having equal amounts of positive and negative charges at both ends. The dipoles are arranged without order, but when a voltage is applied to both electrodes 41 and 42, the positive and negative charges of the dipoles create an attractive force between them and the electrodes of opposite signs, and the direction changes. Start rotating. As a result, each dipole will be aligned in the direction of the electric field. Since the polarity of the high-frequency voltage changes periodically, when the voltage polarity of the electrode is reversed, the direction of the dipole is also reversed accordingly. In this way, the dielectric 44
Each molecule 43 of is the frequency of the electrode (e.g. 40MHz)
When they repeatedly reverse according to the following, they collide and rub against each other, generating heat. Therefore, when the two dielectrics 44 are sandwiched between the electrodes 41 and 42, the two dielectrics 4
4 is fused.

Furthermore, the following methods can be cited to improve the productivity of the manufacturing method described above.

The jigs 100 and 200 are twice as long as the apparatus described above, and the tubes placed therein are twice as long as the tubes described above. Then, connect both ends of the electrode 101 of the jig 100 to the electrode 2 of the jig 200.
If the jig 100 is lowered and placed on the jig 200 by making the length shorter than 02, the electrode 101 will be located only on a part of the electrode 202, and the electrode 101 will be placed on both ends of the tube inserted into the cylindrical rod 205. A tube prototype will be manufactured. Therefore, two branch covers can be manufactured at one time by cutting a branch cover having tube original shapes at both ends at the middle part.

(2) Method for manufacturing the branch cover 10 in which the welded portion 12 is separated by a predetermined length A tube extruded from thermoplastic vinyl chloride resin or the like with an inner diameter of 14φ and an outer diameter of 16φ is cut into a predetermined length. , cut tube 50
The jig 100 and the jig 20 shown in FIGS. 4a and 4b
It is fitted from the open side into a cylindrical rod 205 (not shown) of a manufacturing apparatus using a cylindrical rod 205 using a cylindrical rod 205, and is pushed in until one end abuts against a fixing plate 206. By this fitting, the welded and formed portion of the tube 50 is placed on the jig 200,
The part corresponding to the tube original part 11 is a cylindrical rod 20
It is placed outside of 5. When the tube 50 is placed on the jig 200, pressing force is applied to the jig 100 located on the jig 200 to move the jig 100 onto the jig 200.
descend towards. By lowering the jig 100, the electrode 101 is placed on the electrode 202, and the tube holder 10
2 is a tube holder 203 along the cylindrical rod 205
Above, the protrusion 110 of the electrode 101 is also connected to the electrode 2.
The tube 50 is placed on the insulating material 210 of 02, and the tube 50 fitted on the cylindrical rod 205 is
5, a part of the tube is held between the electrodes 101 and 202, as well as between the protrusion 110 and the insulating material 210, and the inner circumferential surface of the tube is brought into pressure contact with the electrodes 101 and 202. After this, the high frequency power of the high frequency wilder is turned on, and the frequency is set between both electrodes 101 and 202.
Apply high frequency voltage at 40MHz and output 2.0Kw. The high frequency voltage is applied for 0.1 to 0.3 seconds, and both electrodes 101,
The tube held between the tubes 202 is made to generate heat. Pressing force 2.0 to 4.0Kg/cm ² by both electrodes 101 and 202
pressure is applied to the clamping part, and the clamping part is welded and formed. Further, the portion sandwiched between the protrusion 110 and the insulating material 210 is
The adjacent parts of the separated parts are welded and formed to form a small-diameter single tube 14.
a is formed. When welding is completed, jig 1
When the upper electrode of the high frequency wilder fixed with 00 is raised and the branch cover 10 manufactured from the cylindrical rod 205 is pulled out, the branch cover 10 with the welded part 12 separated by a predetermined length as shown in FIG. 1b is manufactured. ends.

In the method for manufacturing the branch cover described above, the case where there are two branch parts 14 has been explained, but the case where there are three branch parts 14 can be manufactured in the same manner. Alternatively, the upper jig may be fixed and the lower jig may be raised.

〔Effect of the invention〕

As explained above, according to the branch cover, the method for manufacturing the same, and the apparatus for manufacturing the same of the present invention, one end of the tube made of thermoplastic plastic or the like is used as the original part, and the necessary parts of the tube are welded from the original part to the other end. to form multiple branch tubes, the cable branch connections and cable cores can be easily inserted, and the protection of the cable cores and cable connections is complete, improving reliability. . Further, troublesome operations such as winding tape and applying adhesive for fixing can be omitted. Furthermore, since the shape and dimensions of the branch cover are stable, quality can be improved.

Furthermore, the method for manufacturing a branch cover described above has the following effects.

(1) The welding and forming of the branch tube is performed using a high-frequency wilder, making the work simple.

(2) Since the tube inserted into the cylindrical rod is welded and formed while being held by the tube holder, the shape and dimensions of the branch cover are stable.

Furthermore, the branch cover manufacturing apparatus described above has the following effects.

(1) Since the electrodes are located adjacent to the plurality of cylindrical rods and tube holders are provided on both sides of the electrodes, welding and forming of the branch tube depends on the shapes and dimensions of the plurality of cylindrical rods and the tube holders. Therefore, the shape and dimensions of the branch cover are stabilized.

(2) An elastic mechanism is installed in the tube holder of the upper jig that descends when pressed, so it can absorb variations in tube outer diameter, wall thickness, etc., making welding and forming of the branch cover stable. .

(3) Welding and separation of the welded parts can be performed simultaneously using a pair of electrodes with protruding parts and insulating material provided on some parts, making the work easy and making it possible to adjust the shape of the branch cover,
Dimensions are stable.

[Brief explanation of the drawing]

Figures 1a, b, and c are explanatory diagrams showing one embodiment of the present invention, Figures 2a and b are explanatory diagrams showing a case where there are three branch tubes, and Figures 3a and b are diagrams showing branches of the present invention. An explanatory diagram showing a cover manufacturing apparatus, Figures 4a and b are explanatory diagrams showing a jig used to manufacture a branch cover in which the welded parts are separated by a predetermined length, and Figure 5 is a welding of high frequency Wilder. Explanatory diagram showing the principle of
Figures a and b are explanatory diagrams showing a conventional branch cover. Explanation of symbols, 10... Branch cover, 11... Tube original shape part, 12... Welded part, 13... Inner hole,
14... Branch part, 14a... Small diameter single tube,
20... Flat cable, 21... Sheath, 22...
... wire core, 23 ... conductor, 40 ... high frequency power supply, 4
1, 42... Electrode, 43... Molecule, 44... Dielectric, 50... Vinyl insulation tube, 60... Large diameter tube, 64... Single tube, 70... Tube, 100... Jig, 101 ...Electrode, 10
2...Tube holder, 103...Recess, 104
... Fixed body, 105 ... Holding body, 106 ... Coiled spring, 110 ... Projection, 200 ...
Jig, 201... Flat plate, 202... Electrode, 203
...Tube holder, 204...Guide section, 205
... Cylindrical rod, 206 ... Fixed plate, 210 ... Insulating material.

Claims (1)

[Scope of Claims] 1. In a branch cover that covers a cable branch connection part for connecting an in-house wiring cable to a lighting device, a wall outlet, etc., one end of a tube made of thermoplastic plastic or the like is used as the original part, and the A plurality of branch tubes are formed by welding required parts of the tube from the original part to the other end, and the in-house wiring cable is inserted from the original part of the tube to connect the plurality of cable cores to the plurality of branch tubes. 1. A branch cover, wherein the cable sheath of the in-house wiring cable is fitted by the original part of the tube. 2. In a branch cover that covers a cable branch connection part that connects a cable for in-house wiring to a lighting device, a wall outlet, etc., one end of a tube made of thermoplastic plastic, etc. is the original part, and from that original part to the other end. a plurality of branched tubes are formed by welding required portions of the tubes, and the distal ends of the branched tubes are separated by a predetermined length to form a plurality of small-diameter single tubes; A cable for in-house wiring is inserted and a plurality of cable cores are fitted by the plurality of small diameter single tubes, and a cable sheath of the cable for in-house wiring is fitted by the original shape part of the tube. A branch cover characterized by: 3 Cutting a tube made of thermoplastic plastic or the like to a predetermined length, and cutting the tube to the predetermined length on the outer periphery of a plurality of cylindrical rods arranged in parallel at predetermined intervals on a lower jig. a step of fitting the tube into the fixed plate until the cylindrical rod contacts a fixing plate to which the plurality of cylindrical rods are fixed; and fitting an upper jig into the lower jig on which the plurality of cylindrical rods are arranged; The tube fitted on the outer periphery of the cylindrical rods is held so as to follow the shape of the plurality of cylindrical rods, and the outer periphery of the plurality of cylindrical rods is held by the electrodes provided on the upper jig and the lower jig. sandwiching the tube fitted between adjacent parts of the cylindrical rod; and applying a high frequency voltage to the electrodes that sandwich the tube, welding a part of the tube to form a plurality of branch tubes. A method for manufacturing a branch cover, comprising: a step of extracting the plurality of branch tubes from the cylindrical rod. 4. The tube has a length twice that of the branch cover to be molded, the upper jig and the lower jig have predetermined lengths that match the tube having the double length, The tube is held between both jigs, a high frequency current is applied to the electrodes of both jigs, a part of the tube is welded to form a plurality of branch tubes, and then the branch tube is cut at the center, and at the same time. 4. The method for manufacturing a branch cover according to claim 3, wherein two branch covers are produced. 5. Cutting a tube made of thermoplastic plastic or the like to a predetermined length, and cutting the tube to the predetermined length on the outer periphery of a plurality of cylindrical rods arranged in parallel at predetermined intervals on a lower jig. a step of fitting the tube into the fixed plate until the cylindrical rod contacts a fixing plate to which the plurality of cylindrical rods are fixed; and fitting an upper jig into the lower jig on which the plurality of cylindrical rods are arranged; The tube fitted on the outer periphery of the cylindrical rod is held so as to follow the shape of the plurality of cylindrical rods, and an electrode is provided on the upper jig and has a protrusion on a portion thereof, and an electrode is provided on the lower jig. sandwiching the tube, which is fitted onto the outer periphery of the plurality of cylindrical rods, between adjacent portions of the cylindrical rods by means of an electrode having an insulating material on a portion thereof; applying a high frequency voltage to an electrode and welding a part of the tube to form a plurality of mutually separated small-diameter single tubes; A method for manufacturing a branch cover, comprising the step of extracting it from a cylindrical rod. 6. the tube has a length twice that of the branch cover to be molded; the upper jig and the lower jig have predetermined lengths that match the tube having the double length; The tube is held between both jigs, and a high frequency current is applied to the electrodes of both jigs to weld a part of the tube and separate a part to form a plurality of branch tubes. 6. The method for manufacturing a branch cover according to claim 5, wherein two branch covers are produced at the same time. 7 tube fixing means for fixing a tube cut into a predetermined shape; clamping means for longitudinally clamping a part of the tube fixed to the tube fixing means; 1. An apparatus for manufacturing a branch cover, comprising a welding means for forming a branch tube by welding the parts by applying a high-frequency electric field to the parts. 8. The method of manufacturing a branch cover according to claim 7, wherein the fixing means arranges a plurality of cylindrical rods in parallel at predetermined intervals, and fits the tube onto the outer periphery thereof. 9. The holding means is located between a plurality of tube holders that hold the tubes fitted around the outer peripheries of the plurality of cylindrical rods so as to follow the shape of the cylindrical rods, and the plurality of tube holders. a lower jig having an electrode protruding upward; a plurality of tube holders that hold the tubes fitted onto the plurality of cylindrical rods so as to follow the shape of the cylindrical rods; and the plurality of tubes. an upper jig having a downwardly protruding electrode located between the holders, and when the upper jig is lowered, the electrodes of the lower jig and the electrodes of the upper jig are connected. 8. The method of manufacturing a branch cover according to claim 7, wherein the tube fitted onto the plurality of cylindrical rods is held between adjacent portions of the plurality of cylindrical rods in the longitudinal direction. 10. Claim 7, wherein the cylindrical rod, the tube holder, and the electrode are provided in a number corresponding to the number of branches for branching the tube into a desired number.
The method for manufacturing the branch cover described in Section 1. 11. Tube fixing means for fixing a tube cut into a predetermined shape; clamping means for longitudinally clamping a part of the tube fixed to the tube fixing means; a welding means for welding the parts by applying a high-frequency electric field to the parts to form a branch tube; and separating and welding a part of the sandwiched parts;
1. An apparatus for manufacturing a branch cover, comprising a separation means for forming small diameter single tubes separated from each other. 12. The branch cover manufacturing apparatus according to claim 9, wherein the tube holder is constituted by a fixed body and a holder having a stretchable elastic member therebetween. 13 The separation means is formed by a protrusion provided on a part of the electrode of the upper jig and an insulating material with a small relative dielectric constant provided so as to cover a part of the electrode of the lower jig. 12. The tube according to claim 11, wherein the tube is melted by concentrating an electric field on a portion avoiding the insulating material, and the melted portion is cut by the protrusion and the insulating material. Branch cover manufacturing equipment. 14. Claim 14, wherein the cylindrical rod, the tube holder, the electrode, and the protrusion and the insulating material provided on the electrode are provided in a number corresponding to the number of branches for branching the tube into a desired number. 1st
The branch cover manufacturing device according to item 1.