JPH0665107B2 - Multi-core cable wiring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial field of application” The present invention relates to a multi-core cable for holding a core wire of a multi-core cable in a press-connecting jig at a predetermined interval and arrangement when connecting the core wire to a press-connecting connector. The present invention relates to a cable wiring device.

“Prior Art” In recent years, a multicore cable having connectors at both ends is used for connecting electronic devices, for example, connecting a personal computer and a printer. As this connector, a pressure contact type connector that can be connected by simply pushing the core wire into the U contact is used, but as the number of core wires increases,
Double-sided connectors have been used in which a large number of U contacts are arranged on both sides of the body of the connector.

FIG. 8 shows an example of a structure in which a core wire of a multi-core cable is connected to a double-sided connector. In the figure, 1 is a multi-core cable, 2 is a shield wire made of a metal mesh, and 3 is a core wire which is itself insulation-coated. The connector 4 has a comb-shaped holding groove 5 for holding the core wires 3 at predetermined intervals,
U contacts 6 for connecting the individual core wires 3 to predetermined terminals are provided on both surfaces of a frame 7 made of synthetic resin. In this row, the U contact 6 is
The two rows are arranged alternately in the upper and lower rows. Reference numeral 8 denotes a holding plate which covers the core wire 3 attached to the connector 4, and has a large number of through holes 9 through which the U contacts 6 project when covered.

To connect a core wire of a multi-core cable to such a double-sided connector, a comb-shaped holding groove for holding the core wire at a predetermined interval,
The core wire is attached in a predetermined arrangement to a jig having a press contact blade for pressing the core wire against the U contact of the connector, and the jig is pressed against the surface of the double-sided connector having the U contact to correspond each core wire. It is done by pushing it into the U contact. Also, after attaching the core wires to the protector (insulating cover) having comb-shaped holding grooves in a predetermined arrangement, press this protector against the surface of the double-sided connector with the U contact to connect the individual core wires and attach the protector. A method of simultaneously performing and is also adopted.

In any case, before connecting the core wire to the double-sided connector, it is necessary to hold it on the wiring surface of the pressure welding jig at a predetermined interval and arrangement. As such a wiring device, a mechanism for holding and moving a pressure welding jig is provided inside the device frame,
A guide groove for dropping the core wire to a predetermined position is provided on the upper surface of the device frame, and the pressure welding jig is moved so that the predetermined position of the wiring surface is positioned below the guide groove, and the core wire is guided in that state. A structure is adopted in which the core wire is held at a predetermined position of the pressure welding jig by pushing down through the groove.

In this case, the core wire at one end of the multi-core cable is randomly connected to the connector in advance, this connector is connected to the position detecting device for the core wire, and the core wire at the other end is laid. That is, the core wires at the other end are picked up one by one by hand, and a weak current is passed between the position detection device and the human body to detect the position of the core wire to be arranged on the wiring surface of the pressure welding jig. To do. Based on this signal, the pressure welding jig is moved to accurately position a predetermined portion of the wiring surface below the guide groove. In this state, the core wire is pushed downward through the guide groove, so that the wire is laid on the wire laying surface of the pressure welding jig at a position where the core wire is to be arranged.

[Problems to be Solved by the Invention] However, in the conventional wire laying device for a multi-core cable, the core wires are picked up one by one from a bundle of core wires of the multi-core cable by hand, and a human body is passed between the position detection device and the core wire. Since a weak current is applied to detect the position of the core wire that should be placed on the wiring surface of the pressure welding jig, it is difficult to fully automate the wiring work and increase production efficiency. However, since electricity is passed through the human body, there is a problem in that a position detection error occurs and a large number of defective products are generated.

Therefore, an object of the present invention is to facilitate the automation of the wiring work, improve the production efficiency, improve the position detection accuracy of the core wire, and prevent the occurrence of defective products. To provide.

"Means for Solving the Problem" In order to achieve the above object, the present invention provides a multi-core cable wiring device for holding the core wire of a multi-core cable at a predetermined spacing and arrangement on a wiring surface of a pressure welding jig. A holder for the pressure welding jig and a moving mechanism for this holder are provided inside the equipment frame, and a guide groove for guiding the core wire to a predetermined position of the pressure welding jig arranged below is provided on the upper surface of the equipment frame. A core wire supply device for supplying the core wires one by one is provided in the vicinity of the groove, and the core wire supply device includes a guide plate that holds the core wires of the multi-core cable in a row and is slidably mounted on the guide plate. A first pusher that pushes the core wire toward the end of the guide plate, and a step portion that is arranged in sliding contact with the end of the guide plate and has one core wire that engages with the sliding contact surface, Wick extruded from the guide plate A second pusher that pushes the wire while changing its direction by engaging the step with the step, and a second pusher arranged on the side of the movement path of the second pusher.
It is characterized by comprising an insulating member for holding the core wire between the pusher and a pusher, which is attached to a portion of the insulating member that comes into contact with the core wire, and which cuts the insulating coating of the core wire to conduct electricity.

In a preferred aspect of the present invention, a clamp that holds the core wire held between the second pusher and the insulating member in an openable and closable manner, and a clamp moving mechanism that moves the clamp to insert the core wire into the guide groove. And are provided.

[Operation] In the wiring device of the present invention, the core wires are previously sandwiched by the guide plates and arranged in a line. Then, the first pusher that moves along the guide plate pushes the core wire toward the end portion of the guide plate. In this case, since the second pusher is in sliding contact with the end portion of the guide plate, the core wire is not pushed out as it is, and
When the pusher is operated, the pusher is caught by the stepped portion formed on the sliding contact surface and pushed out one by one.

An insulating member is installed on the side of the second pusher in the moving direction, and the core wire is held between the second pusher and the insulating member. At this time, at the same time, the current-carrying blade attached to the insulating member cuts the insulating coating of the core wire and contacts the internal conductor wire, and the core wire is energized with the position detecting device to which the other end of the multicore cable is connected. Then, the position detection device detects the position on the wiring surface of the press-fitting jig whose core wire is to be held,
A signal is sent to the movement mechanism of the pressure welding jig, and the pressure welding jig is moved so that the corresponding position on the wiring surface of the pressure welding jig is located directly below the guide groove.

After that, by pushing the core wire held between the second pusher and the insulating member downward through the guide groove, the core wire can be accurately held at the corresponding position on the wiring surface of the pressure welding jig. By repeating such operations,
The core wires of the multi-core cable can be held on the wiring surface of the press-fitting jig at a predetermined interval and arrangement, and then the press-connecting jig is pressed against the connector to connect to the connector.

As described above, according to the present invention, the core wires of the multi-core cable can be supplied one by one to the predetermined position, and the handling of the core wires is facilitated. For example, the core wires are grasped by a clamp and pushed down into the guide groove. By doing so, the wiring work can be fully automated. In addition, since the energization between the position detection device and the position detection device does not pass through the human body, the energization blade directly energizes the core wire, so that a position detection error hardly occurs and defective products can be significantly reduced.

"Embodiment" FIGS. 4 and 5 show an example of a pressure welding jig for holding the core wires 3 of the multi-core cable 1 at a predetermined interval and arrangement for pressing the core wires 3 to the double-sided connector. .

The press-connecting jig 11 has a U-shaped substrate 13 as a whole, in which a notch 12 for inserting a core wire of a multi-core cable is formed in a central portion. A pair of elongated holding members 14 are attached along opposite sides of the substrate 13, respectively. The holding member 14 is composed of an outer frame member 15 having a U-shaped cross section, and a pressure contact member 16 arranged in a groove at the center of the outer frame member 15. And
Both ends of the outer frame member 15 are connected to the substrate 13 by a pair of shafts 19.
It is rotatably supported above.

The outer frame member 15 is provided with comb-teeth-shaped holding grooves 17 for holding the core wires at predetermined intervals. Further, the press contact member 16 is formed with a large number of press contact blades 18 for pushing the core wire into the corresponding U contacts of the double-sided connector.
The surface of the holding member 14 on which the holding groove 17 of the outer frame member 15 and the press-contact blade 18 of the press-contact member 16 are formed constitutes a wiring surface (a surface for holding the core wires in a predetermined arrangement) in the present invention. The holding member 14 is rotatable via the shaft 19 between a state in which the wiring surface faces upward and a state in which the wiring surface faces inward.

In the case of this example, two pins 20 are provided on each of the rear surfaces of the pair of press-contact members 16 so as to project therefrom.
Extends through the back surface of the outer frame member 15 and extends rearward. Further, a spring 21 is mounted between the head 20 a of the pin 20 and the back surface of the outer frame member 15. Due to this spring 21, the pressure contact member 16 is always in contact with the outer frame member 1
It is urged to come into contact with the bottom portion of the outer frame member 15, that is, to be retracted into the outer frame member 15. A through hole 22 is formed in the portion of the substrate 13 where the pin 20 is provided so as not to hinder the rotation of the holding member 14.

When using the pressure welding jig 11, the core wire holding member 14
With the wire laying surface facing upward, the wire laying device of the present invention described below holds the core wires of the multi-core cable on the wire laying surface in a predetermined arrangement and at predetermined intervals. In this state, the pressure welding jig 11
The core wire holding members 14 are rotated so that their wiring surfaces face each other inward. Next, the double-sided connector is inserted between the pair of core wire holding members 14. Then, the pin 20 of the pressure welding jig 11 is pushed inward by a press device (not shown),
The pressure contact member 16 is pushed inward. As a result, the individual core wires held on the wiring surface of the core wire holding member 14 of the pressure welding jig 11 are
The press contact blades 18 of the press contact member 16 are pushed into the corresponding U contacts of the double-sided connector for connection.

FIG. 6 and FIG. 7 show an example of a core wire supply guide jig used in the wiring device according to the present invention.

That is, the core wire supply guide jig 31 has a pair of guide plates 32 made of a relatively long plate material, and one end of each of these guide plates 32 is openably and closably coupled by a hinge mechanism. . On one side of the guide plate 32, a step 32a is formed by cutting out the outer corner in an L shape.

A first pusher 35 is attached to the core wire supply guide jig 31. The first pusher 35 includes a prismatic block 36, a pair of pressing plates 37 attached to both sides of the block 36, a pressing blade 38 protruding in a rib shape at the center of the block 36, and a block 36. And a dovetail groove 39 formed at one end of the. In this case, push blade 38
Is approximately the same as the diameter of the core wire of the multi-core cable.

The core wires of the multi-core cable are flattened by rollers or the like to be arranged in a row and then sandwiched between the pair of guide plates 32. Then, as shown in FIG. 7, the first pusher 35 is attached to the guide plate 32, and the holding plate 37 keeps the guide plate 32 closed. At this time, the push blade 38 of the first pusher 35 is inserted into the gap between the guide plates 32. Therefore, the first pusher 35 is attached to the guide plate 3
When moved along 2, the core wire held by the guide plate 32 by the push blade 38 is pushed toward the end of the guide plate 32.

FIG. 1, FIG. 2 and FIG. 3 show an embodiment of a multicore cable wiring device according to the present invention.

As shown in FIG. 3, this wiring device has a box-shaped device frame 61. On the upper surface of the device frame 61,
An opening 62 is formed through which the core wire 3 of the multi-core cable 1 held by the core wire supply guide jig 31 is inserted, and the core wire 3 is pressed from the opening 62 toward the front of the apparatus frame 61. A guide groove 63 for guiding the predetermined holding groove 17 is formed. Also, this guide groove 6
A pair of inserters 64 are attached to guide the core wire 3 to the wire 3.

A pusher device 65 is installed on the front side of the upper surface of the device frame 61. This pusher device 65 has a pressing blade 6 that pushes down the core wire 3 through the guide groove 63 at the tip.
Have six. The pusher device 65 includes the device frame 6
The operation of moving the pressing blade 66 parallel to the upper surface of the first pressing blade 66 to position the pressing blade 66 directly above the guide groove 63;
Push down through. Therefore, the core wire 3 guided to the guide groove 63 by the inserter 64 is pushed by the pressing blade 66 of the pusher device 65 into the predetermined holding groove 17 of the pressure welding jig 11.

The press-connecting jig 11 is inserted into and held by a holder 68 that is erected on a spur gear 67 arranged in the apparatus frame 61. The spur gear 67 has a notch 67 on the front side.
a is formed, and the multi-core cable 1 is inserted into the cutout portion 67a. The lower portion of the spur gear 67 forms a cylindrical portion 69, and a plurality of backup rollers 70 are in contact with the outer periphery of the cylindrical portion 69 to hold the spur gear 67 rotatably. The spur gear 67 and the backup roller 70 are installed in a slide base 73 supported by a slide way 71 via a block 72 in the device frame 61. A spur gear 74 connected to a step motor (not shown) is attached to the slide base 73, and the spur gear 74 meshes with the spur gear 67 to form a spur gear 67.
Is rotated at a predetermined angle. Further, the slide base 73 includes the ball screw 7 supported by the bearing 75.
6, the ball screw 76 is rotated by another step motor (not shown) so that the ball screw 76 can move in the left-right direction in FIG. 3 at an arbitrary distance.

Therefore, by rotating the pressure welding jig 11 held by the holder 68 by the spur gear 67 and moving it by the slide base 73, the predetermined holding groove 17 of the pressure welding jig 11 is positioned directly below the guide groove 63. It can be done. In FIG. 3, reference numeral 77 is a swing sensor that detects that the core wire 3 is pushed down through the guide groove 63 and operates the pusher device 65. Further, reference numeral 78 is a base arranged below the device frame 61.

The core wire 3 at the other end of the multi-core cable 1 is randomly connected to the double-sided connector 4 in advance.
Is connected to the connector 79 of the position detecting device 80. The position detection device 80 detects at which position the core wire 3 to be held in the pressure welding jig 11 should be inserted by an energization test described later, and operates the rotation mechanism of the spur gear 67 and the movement mechanism of the slide base 73. A signal is sent to position the pressure welding jig 11 so that the corresponding holding groove 17 of the pressure welding jig 11 is directly below the guide groove 63.

As shown in FIG. 1, a core wire supply device 81 for supplying the core wires 3 to the inserters 64 one by one is arranged near the inserter 64 on the upper surface of the device frame 61.

The core wire supply device 81 has a pair of blocks 83 installed in parallel to the base 82, and the guide plate 32 holding the core wire 3 is inserted and installed between the blocks 83. Therefore, the core wires 3 are sandwiched by the guide plates 32 and arranged in a line with their ends facing upward. And
An operation rod 86 of an air cylinder 85 attached to a base 82 via a support plate 84 is connected to a rear end portion of the first pusher 35 mounted on the guide plate 32. And
By the operation of the air cylinder 85, the first pusher 35
Attaches the core wire 3 held by the guide plate 32 to the guide plate 32.
It is designed to be pushed toward the right end of the.

Referring also to FIG. 2, the base 82 of the core wire supply device 81
A slide way 91 is attached to the guide plate 32 at right angles to the guide plate 32. A slide base 92 is supported on the slide way 91 at an end portion of the guide plate 32 so as to be movable in a direction orthogonal to the slide base 92. The slide base 92 is connected to an operation rod 95 of an air cylinder 94 attached to the base 82 via a support plate 93, and moves along the slide way 91 by the operation of the air cylinder 94. Further, the slide base 92 has an air cylinder 9
6 is installed, and the operating rod 97 of this air cylinder 96
The second pusher 98 is connected to the. The operation of the air cylinder 96 causes the second pusher 98 to move the guide plate 32.
It slides in contact with the end of the and reciprocates in a direction orthogonal to it.
On the surface of the second pusher 98 that is in sliding contact with the end portion of the guide plate 32, a notch step portion 99 is formed between the end surface of the guide plate 32 and one core wire 3 is inserted.

Therefore, the core wire 3 sandwiched in a line by the guide plate 32
Are pushed by the first pusher 35 toward the end portion of the guide plate 32, and then are engaged one by one with the stepped portion 99 of the second pusher 98 to be extruded in different directions. When the guide plate 32 holding the core wire 3 is set between the pair of blocks 83, the air cylinder 94
The slide base 92 is retracted by the operation of, and the guide plate 32 is easily inserted.

The insulating member 100 is provided on the side of the movement path of the second pusher 98.
Are arranged. This insulating member 100 is provided with a guide plate 3
2 is attached to the block 83 adjacent to the guide plate 32.
101 that is in contact with the end face of the second pusher 98 and is in sliding contact with the second pusher 98.
have. Further, a slit 102 is formed to elastically bring the sliding contact surface 101 into contact with the second pusher 98. In addition, a concave groove 103 with which the core wire 3 engages is formed at the end of the sliding contact surface 101. Further, the sliding contact surface 10
An energizing blade 104 that energizes the core wire 3 with the position detecting device 80 described above is attached to the unit 1.

Referring again to FIG. 1, above the apparatus frame 61, a frame 110 extending on a column (not shown) is arranged. The frame 110 has a first clamp 1
11 and the second clamp 112 are attached. First
The clamp 111 includes the second pusher 98 and the insulating member 100.
The air cylinder 113, which is disposed above the sliding contact surface with and, performs opening / closing operation by the operation of the air cylinder 113, and also performs up / down operation by the operation of the air cylinder 114 fixed to the frame 110. The second clamp 112 is arranged in the opposite direction with respect to the core wire supplying device 81 with the guide groove 63 interposed therebetween, and is configured to perform an opening / closing operation, a horizontal movement, and a lifting operation by a plurality of air cylinders. There is. When the second clamp 112 moves forward in the horizontal direction, the tip of the second clamp 112 moves toward the second pusher 98.
Notch groove 98 a of the insulating member 100 and the notch groove 100 a of the insulating member 100.
It is designed to be inserted into the space formed by a and a.

Next, the operation of this wiring device will be described.

As shown in FIG. 3, the pressure welding jig 11 holds the holder 6 with the wiring surface of the holding member 14 facing upward (state shown in FIG. 4).
Insert into 8 and hold. In the multi-core cable 1, the core wire 3 at one end thereof is randomly connected to the double-sided connector 4 in advance and connected to the connector 79 of the position detection device 80. The core wire 3 at the other end of the multi-core cable 1 is sandwiched between the guide plates 32 of the guide jig 31 while being arranged in a line.

As shown in FIG. 1 and FIG. 2, the guide plates 32 are installed between the blocks 83 of the core wire supplying device 81, and the core wires 3 are sandwiched between the guide plates 32 and the ends are arranged in a line with the ends facing upward. It will be in the state of Further, the first pusher 35 is connected to the operating rod 86 of the air cylinder 85, and the air cylinder 85 pushes the core wire 3 toward the right end portion of the guide plate 32 by the first pusher 35.

Wiring work is started in this state. First, the core wire 3 is the first
One is pushed out from the end portion of the guide plate 32 by being pushed by the pusher 35, and enters into the notch step portion 99 of the second pusher 98 which is in sliding contact with the end surface of the guide plate 32. Next, the operation of the air cylinder 96 causes the second pusher 98 to move forward, so that the one core wire 3 changes direction and is pushed out. The core wire 3 moves while being sandwiched between the second pusher 98 and the sliding contact surface 101 of the insulating member 100, and at that time, comes into contact with the current-carrying blade 104 to be cut with the insulating coating, and with the position detecting device 80. Momentary energization is performed. The position detection device 80 detects the position where the core wire 3 should be arranged on the wiring surface of the pressure welding jig 11. Then, a holder 68 that sends a signal to the rotating mechanism of the ball screw 76 and the rotating mechanism of the spur gear 67 to hold the pressure welding jig 11.
Is rotated in a predetermined direction and horizontally moved by a predetermined distance.
In this way, the press-fitting jig 1 is arranged so that the predetermined holding groove 17 of the holding member 14 of the press-connecting jig 11 is directly below the guide groove 63.
The position of 1 is set.

The core wire 3 extruded by the second pusher 98 is the insulating member 1
00 is held in the concave groove 103 of the sliding contact surface 101. In this state, the first clamp 111 descends, grips the upper end of the core wire 3, and raises again to pull the core wire 3 upward to eliminate the slack. Next, the second clamp 112 moves forward in the horizontal direction to insert the tip into the space defined by the notch groove 98a of the second pusher 98 and the notch groove 100a of the insulating member 100, and the core wire 3 at that portion. To hold. At this time, the first clamp 111 releases the core wire 3 and returns to the original position.
Further, the second clamp 112 retracts in the horizontal direction, and the core wire 3 is pulled out from between the second pusher 98 and the insulating member 100. When the second clamp 112 returns to the original position, this time it descends and pushes down the core wire 3. As a result, the core wire 3
Is guided by the inserter 64 and pushed downward through the guide groove 63. At this time, the swing sensor 77 provided on the holder 68 of the pressure welding jig 11 detects the core wire 3,
The pusher device 65 is operated. The pusher device 65 is
Move in the horizontal direction, further descend, and press down the blade 66 to the core wire 3
Is pressed into a predetermined groove of the pressure welding jig 11. At the same time,
Although not clearly shown in the drawing, the pressing blade 66 and the pressure welding jig 1
The pressure contact member 16 of No. 1 makes a sliding contact, and the excess end of the core wire 3 is cut and removed.

By repeating such work, the multi-core cable 1
Wiring work can be performed by sequentially pushing the core wires 3 of No. 3 into the corresponding grooves of the pressure welding jig 11. Thus, the core wire 3
After holding the wiring surface of the pressure welding jig 11 at a predetermined interval and arrangement, the wiring surface of the pressure welding jig 11 is pressed to the double-sided connector 4 by the method described above, whereby the multi-core cable is attached to the double-sided connector 4. The core wire 3 of can be connected.

[Advantages of the Invention] As described above, according to the present invention, the core wires of the multi-core cable are arranged in a row and sandwiched by the guide plates, and the first pusher and the second pusher push out one by one. The core wire can be supplied to a predetermined position, and the core wire can be easily handled. Therefore, if the core wire is grasped by the clamp and pushed down into the guide groove, the wiring work can be fully automated. Further, when the core wire is pushed out, its insulating coating is cut by the current-carrying blade and the position is detected by directly energizing the core wire, so that a position detection error rarely occurs, and the generation of defective products can be greatly reduced. .

[Brief description of drawings]

FIG. 1 is a perspective view of a main part showing an embodiment of a wiring device of the present invention, FIG. 2 is a plan view showing a core wire supplying device in the wiring device, and FIG. 3 is a pressure welding jig of the wiring device. FIG. 4 is a perspective view showing the moving mechanism, FIG. 4 is a perspective view showing an example of a pressure welding jig used in the wiring device of the present invention, FIG. 5 is a front view of the same pressure welding jig, and FIG. 6 is a cloth of the present invention. Fig. 7 is an exploded perspective view showing an example of a core wire supply guide jig used in a wire feeder, Fig. 7 is a perspective view showing a state in which the same core wire supply guide jig is assembled, and Fig. 8 is a diagram showing the core wire of a multicore cable connected to a double-sided connector. It is a perspective view showing an example of the state where it did. In the figure, 1 is a multi-core cable, 3 is a core wire, 4 is a double-sided connector, 11 is a pressure welding jig, 14 is a holding member, 15 is an outer frame member, 16 is a pressure welding member, 17 is a holding groove, 31 is a core wire supply guide. Jig, 32 is a guide plate, 35 is a first pusher, 61
Is a device frame, 63 is a guide groove, 64 is an inserter,
65 is a pusher device, 66 is a pressing blade, 67 is a spur gear, 6
8 is a holder, 73 is a slide base, 76 is a ball screw, 81 is a core wire supply device, 98 is a second pusher, 99 is a stepped portion, 100 is an insulating member, 101 is a sliding contact surface, 104 is a conductive blade, and 111 is a first The clamp 112 is a second clamp.

Claims (2)

[Claims] 1. A wire laying device for a multi-core cable, wherein a core wire of a multi-core cable is held on a wire laying surface of a press-fitting jig at a predetermined interval and arrangement, and a holder of the press-fitting jig and a holder of the holder are provided inside an apparatus frame. And a guide groove for guiding the core wire to a predetermined position of the pressure welding jig arranged below, and a core wire supplying device for supplying the core wires one by one in the vicinity of the guide groove. The core wire supply device is provided with a guide plate that holds the core wires of the multi-core cable in a row, and a guide plate that is slidably mounted on the guide plate and that pushes the core wire toward the end of the guide plate. A pusher and a step portion, which is arranged in sliding contact with the end portion of the guide plate and has one core wire engaged with the sliding contact surface, engages the core wire extruded from the guide plate with the step portion. Second, change direction and push out And Ssha, arranged in the moving path side of the second pusher, the second
An insulating member for holding the core wire between the pusher and the pusher, and an energizing blade which is attached to a portion of the insulating member in contact with the core wire and which energizes by cutting the insulating coating of the core wire. Wiring device for core cable. 2. A clamp for opening and closing a core wire held between the second pusher and the insulating member, and a clamp moving mechanism for moving the clamp to insert the core wire into the guide groove. The multi-core cable wiring device according to claim 1.