JPH11273763A - Cable connecting part of interior wiring tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resist relatively large current by inserting an end of a cable while holding an outer insulated cable end for performing connection, and enlarging a contact area between a cable and a terminal, in a cable connecting structure disposed in an interior wiring appliance. SOLUTION: This cable connecting part is provided with a plurality of blade bodies 4 extending to a cable inserting direction facing to a cable inserting hole 2 disposed in a box body 1 for an interior wiring tool, and the plurality of the blade bodies 4 are radially disposed and cutting blades 9 are formed at edge sides, and inner top sides 11 of each blade body 4 is positioned on a cylindrical surface having a diameter slightly smaller than that of a core wire 13 of a cable 12 subjected to connecting. When an end part of a cable having the outer insulated cable 12 end is inserted from a cable inserting hole 2, a tip end of the cable is guided to a center of a plurality of the blade bodies 4, and the cutting blades 9 cut and open the outer insulated cable end from an end part side, and a cable core 13 of the cable 12 is advanced into a space defined by a plurality of the cutting blades 9, and its outer periphery and the inner top sides 11 of each blade 4 are brought into contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cable connecting portion provided in an indoor wiring device such as a distribution board, a joint box, a rosette, an outlet, etc. And a structure having:

[0002]

2. Description of the Related Art For indoor wiring in a general house, an indoor wiring cable drawn out from a distribution board provided at an electric wire entrance is appropriately branched by a branching connection device such as a joint box, and a rosette or an outlet is provided at a terminal end. This is done by connecting Normally, a single-layer two-layer insulated wire is used for the indoor wiring cable, and its core wire has a diameter of 1.6 to 2.0 mm.
Copper wire. There are various types of structures for connecting the end of the cable and the wiring device, and a structure in which a crimp terminal is attached to the end of the cable and screwed to a contact provided in the wiring device is general, In a joint box or the like, a structure in which core wires are twisted with each other and soldered is adopted. In the case of these structures, it is necessary to exfoliate the insulation coating of the cable end in advance to expose the core wire.

On the other hand, in the case of a thin insulated cable used in electronic equipment or the like, a Y-shaped cut is provided at the tip of a protruding plate-shaped contact, and the cable is inserted perpendicularly to the Y-shaped cut. A so-called press-contact type structure in which an insulating coating is cut open by pushing the core wire into the core and the core wire is sandwiched from both sides by the edge of the groove to connect the core wire is widely used. According to this structure, it is not necessary to peel off the insulating sheath when connecting the cable, and therefore, by adopting this principle, it is possible to connect the cable without peeling the insulating sheath. Various structures of connection parts have been proposed.

[0004]

The structure of attaching a crimp terminal to a cable and screwing the cable requires a great deal of trouble in connecting the cable. On the other hand, the structure in which the cable is pushed into the contact having the Y-shaped notch and connected is such that the core wire and the contact are orthogonal at the contact portion between the cable and the contact, so that the contact area cannot be increased. If you try to make it larger, you need to make the contact terminal thicker,
Removal of the insulated sheath becomes difficult, and a large force is required to push the cable.

Therefore, according to the present invention, the cable can be connected to the wiring device by inserting the end of the cable with the insulating sheath attached, and the contact area between the cable and the terminal can be increased. Therefore, it is an object of the present invention to provide a cable connecting portion of an electric appliance for indoor wiring which can suppress an increase in electric resistance and a generation of heat even when a relatively large current flows.

[0006]

A cable connecting portion of an indoor wiring device according to claim 1 has a plurality of blades extending in a cable insertion direction toward a cable insertion hole 2 provided in a housing 1 of the wiring device. The plurality of blades 4 are radially arranged, and each blade has a cutting edge 9 formed at an end side facing the cable insertion hole 2, and the inner top sides 11 of the blades are substantially parallel to each other. The blade body 4 is formed on a cylindrical surface having a diameter slightly smaller than the diameter of the core wire 13 of the cable 12 to be connected and extends in the cable insertion direction. Characterized by being fixed to.

According to a second aspect of the present invention, there is provided a cable connecting portion of an indoor wiring device according to the first aspect, wherein a cable 12 inserted between the cable insertion hole 2 of the wiring device or the insertion hole and the blade body 4. And a stopper means 3 which allows only the movement of the cable in the insertion direction by being elastically deformed by contact with the cable.

[0008]

When the end of the cable having the insulating sheath is inserted from the cable insertion hole, the end is guided to the distal ends of the plurality of blades arranged radially. At this time, the tip of the cable is guided to the center of the plurality of blades by forming the end side of the blade forming the cutting edge into a trumpet-shaped or V-shaped oblique side toward the center of the plurality of blades. When the cable is further pushed in, the cutting blade 9 cuts the insulating sheath 14 of the cable in the axial direction, and the insulating sheath 14 is cut open from the end side. Then, the core wire 13 of the cable enters between the plurality of cutting blades, and its outer periphery and the inner top side 11 of each blade body.
Is in contact with The inner top side 11 of the blade body may be formed into a sharp edge so as to be cut into the outer periphery of the core wire 13, or may be formed in a planar shape so as to make surface contact with the peripheral surface of the core wire. If the length of the blade body 4 is increased and the cable is inserted deeply, a sufficient contact area between the core wire 13 and the blade body 4 can be secured.

The cutting blade 9 having an inclined blade body serves to guide the cable insertion hole to the center of the plurality of blade bodies, and is cut diagonally into the insulating shell 14 to cut the insulating shell 14 with a light force. It becomes possible to do. However, the guide of the cable tip to the center of the plurality of blades is not necessarily
It is not necessary to perform this operation, and it can also be performed by a retaining means 3 described later or another trumpet-like or funnel-like guide. For example, by forming the cable insertion hole 2 in a trumpet shape and making the tip sides of the plurality of blades face the inner end thereof, it is possible to easily guide the tip of the cable to the center of the plurality of cutting blades.

The cable retaining means can be formed by, for example, a slanting tongue contacting the outer periphery of the insulating sheath 14 of the cable, or a tongue provided on the periphery of the cable insertion hole 2. The tongue piece 3 has such strength that it can be slightly bent and deformed by the insertion force of the cable 12, and is provided so as to be inclined in the cable insertion direction. When inserting the cable 12, the tongue is bent to open the passage of the cable, so that the cable can be inserted. On the other hand, when the cable attempts to move in the pull-out direction, the tips of the tongues 3 and 3 bite into the insulating sheath of the cable to prevent relative slippage, and the bending of these tongues in the cable pull-out direction reduces the diameter of the cable passage. Therefore, pulling out of the cable is prevented. By providing such retaining means 3, 3, after the cable is connected to the wiring device, it is possible to prevent the cable from being pulled and the connection between the wiring device and the cable from being disconnected.

By providing the tongue pieces 3, 3 of the retaining means between the main body of the housing of the wiring device and the cover, the cable passage is opened when the cover is opened, so that the cover is opened. It is possible to allow the cable to be pulled out. That is, in this case, one side of the tongue pieces 3 facing each other is provided on the body side of the housing, and the other side is provided on the cover side.

Two or three blades 3 are provided for one cable. Four or more may be provided, but the benefit is small.
If three blades are provided, it is easy to hold the core wire of the inserted cable at the center of the plurality of blades. While the blade is 2
When it is made into a sheet, guide the side of the cable so that the core wire does not fall out between the blades, or make the inner top 11 of the blade into an edge shape and make the inner top of the blade to the core 13 of the cable. The structure is such that the core wire is guided by biting. When two blades are used, there is an advantage that the structure for fixing the blades to the terminals of the wiring device is simplified.

[0013]

FIG. 1 and FIG. 2 show a first embodiment of the present invention. A cable insertion hole 2 is provided in a housing 1 of the wiring device, only a part of which is shown. Immediately inside the cable insertion hole 2, a retaining tongue piece 3 facing up and down in the figure is arranged, and two blade bodies 4 facing in a direction orthogonal to the facing direction of the retaining tongue piece 3. Is provided. The retaining tongue 3 is bent at the base end side into a U-shape, and is fixed to the housing 1 of the wiring device by embedding molding. The housing 1 can be divided vertically by a plane passing through the center of the cable insertion hole 2, and the lower side is a main body 5 and the upper side is a cover 6. One of the two retaining tongue pieces 3 is fixed to the main body 5 and the other is fixed to the cover 6. The cover 6 is fastened to the main body 5 by screws (not shown).

Each of the two blades 4 is a thin, hard, strip-shaped metal plate having a hypotenuse at the tip, and the base end thereof is fixed by an eyelet rivet 7 with a terminal plate 8 of a wiring device. Terminal plate 8
Is fixed to the main body 5 of the housing. The two blades 4 extend toward the cable insertion hole 2, and the oblique sides of the tips form a V-shape that guides the cable to the center of the two blades. The oblique tip side 9 of the blade body 4 is a cutting edge, and the opposite inner top side 1
Reference numerals 1 and 11 are sharp ridge lines having an acute angle.

The metal tongue 3 has a vertical V-shape so as to guide the tip of the cable inserted from the cable insertion hole 2 to a plane on which the two blades are arranged. Therefore, the tip of the cable 12 inserted from the cable insertion hole 2 is guided from all sides by the tongue pieces 3 arranged vertically in the figure and the tip side 9 of the blade body arranged left and right in the figure, and two sheets are guided. Blade 4
To the center of

In the above configuration, when the end of the cable 12 is inserted through the cable insertion hole 2 provided in the housing 1 of the wiring device with the insulating sheath 14 attached, the end of the cable 12
Guided to the center of the blades, the insulating sheath 14 is cut open from both sides by the blades 4, and the cable is further pushed in, whereby the core wire 13 of the cable is inserted between the two blades. At this time, since the core wire 13 inserted between the blade bodies is softer in material than the blade body 4, the sharp ridge formed on the inner top side 11 of the blade body bites into the core wire, and the core wire 13 comes off from the blade body 4. And good electrical conduction between the core wire 13 and the blade body 4 is ensured.

The distal end of the cable once inserted, even if a force is applied in the direction in which the cable 12 is pulled out, the metal tongue 3 bites into the insulating sheath of the cable to prevent the cable from moving in the direction in which the cable is pulled out. There is no fear. On the other hand, when the cover 6 is removed from the main body 5, one of the opposing retaining tongue pieces 3 is removed, so that the distal end of the cable 12 can be removed from between the blade bodies 4.

FIGS. 3 and 4 show a second embodiment of the present invention. In this embodiment, three blades 4 are provided, and the three blades are radially arranged at an angle of 120 degrees to each other. Cable insertion hole 2 in the housing of wiring equipment
Is formed to have a small thickness, and a plurality of tongue pieces 3 are formed by radial slits. The diameter of the cable insertion hole 2 is slightly smaller than the diameter of the insulating sheath of the cable to be inserted. The inner top side 11 of the blade body 4 is an end face in the plate thickness direction, and the core wire 1 of the cable inserted into the center of the three blade bodies.
Surface contact with 3. An oblique cutting blade is provided on the tip side 9 of the blade body 4. The three oblique cutting edges form a three-way guide for guiding the tip of the inserted cable to the center of the blade body. In this structure, the cable 12 with the insulating sheath inserted from the cable insertion hole 2 is guided to the center by the tip sides of the three blades, and the cable 1
2, the insulating sheath is cut open at three places to expose the core wire 13, and the exposed core wire is inserted between the three blades, so that the periphery of the core wire and the inner top of the blade body 11 makes contact with the core wire 13 and the blade body 4 to establish electrical continuity.

When the cable 12 passes through the cable insertion hole 2, the tongue 3 around the cable 12 is bent inward to allow insertion of the cable. On the other hand, when a force in the pulling direction is applied to the cable, the inwardly bent tongue piece is pulled back, and the tip of the tongue bites into the outer sheath of the cable due to the bending in that direction, thereby resisting the pulling force of the cable. Even when the retaining means is provided in the cable insertion hole itself, if the housing 1 can be separated at the center of the cable insertion hole, the cable can be removed from between the blade bodies 4 by separating the housing 1. Is possible.

FIG. 5 is a perspective view showing a joint box having a cable connecting portion according to the second embodiment. The joint box is composed of a box body 15 molded in a square shape with opaque synthetic resin and a lid 16 made of transparent synthetic resin.
And In the center of the box body 15 is a prism 1
7 is provided upright, and a through hole 18 extending from the upper end to the center of the bottom surface of the box body is provided at the center of the prism 17. The box body 15 accommodates two housings 1 having five cable insertion holes 2, two housings 1 having three cable insertion holes 2, and four housings having two cable insertion holes 2 without gaps. doing. When the number of branches in the joint box is small, the number of housings 1 to be stored is reduced, and a spacer is inserted in an empty place. On the other hand, on the upper surface of the lid 16,
A through hole 19 is provided at a position corresponding to the cable insertion hole 2 of the housing 1 housed in the box body. A through hole 22 is provided at the center of the lid at a position corresponding to the through hole 18 of the prism 17.

In order to connect the outdoor wiring cables 12 with the joint box, the required number and shape of the housings 1 are required.
After being stored in the box body 15, the lid body 16 is crowned,
A wood screw 21 is inserted into the through hole 22 in the center of the lid and the through hole 18 in the box body with the joint box attached to the upper surface or side surface of the beam or the lateral member 20.
And fix it. In order to connect the outdoor wiring cables 12, 12, the cables 12, 12 are inserted into one of the cable insertion holes 2 of one housing 1 that can be seen through the lid 16.
Just insert it.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment.

FIG. 2 is a cross-sectional view of the first embodiment.

FIG. 3 is a perspective view of a second embodiment.

FIG. 4 is a sectional view of a second embodiment.

FIG. 5 is an exploded perspective view showing a usage example of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Cable insertion hole 3 Retaining tongue piece 4 Blade body 8 Terminal board 11 Inner top 12 Cable 13 Core wire

Claims (2)

[Claims] A plurality of blades (4) extending in a cable insertion direction toward a cable insertion hole (2) provided in a housing (1) of a wiring device, the plurality of blades (4) being provided. ) Are arranged radially, and the cutting edge is located at the end of each blade facing the cable insertion hole (2).
(9) is formed, and the inner top side (11) of each blade is positioned on a cylindrical surface having a diameter slightly smaller than the diameter of the core wire (13) of the cable (12) to be connected substantially parallel to each other. A cable connection part for indoor wiring equipment, characterized in that these blades (4) extend in the cable insertion direction and are formed of a conductor and fixed to a terminal plate (8) of the wiring equipment. 2. A cable insertion hole (2) of a wiring device or a cable (1) inserted between said insertion hole and said blade body (4).
2. A cable for an indoor wiring device according to claim 1, further comprising a retaining means (3) for permitting only movement in the insertion direction of the cable by elastically deforming upon contact with (2). Connection.