JP2719904B2 - Uninterruptible bypass device for instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uninterruptible power supply bypass device for repairing and replacing instruments such as an integrated wattmeter for low-voltage distribution lines.

[0002]

2. Description of the Related Art When replacing power distribution equipment such as an integrating wattmeter, it is now required that the construction be carried out without interruption to the customer under high conditions and high reliability. Japanese Utility Model Publication No. 7-13372, filed by the applicant, discloses a bypass connection device for a low-pressure instrument using a tightening screw at a terminal portion of a conventional instrument in which bypass connection is not considered.

[0003]

In the case of the above-mentioned conventional bypass connection device, a set of electric wire drawers consisting of a base and a clamp is required for one electric wire end of the terminal block, and the power supply side and the load are connected. In order to bypass between the in-phase terminals on the side, two sets of electric wire drawers and one set of bypass wires having bypass connectors connected to both ends are required, which is troublesome and causes erroneous connection.

The present invention uses two sets of electric wire drawers and one set of bypass connection lines for two terminals of the same phase.
The unified power supply for the instrument has been made compact by integrating it into a single body, the operation is simple, reliable, easy, and the bypass can be taken quickly, enabling highly reliable uninterrupted work when replacing the instrument. Providing a bypass device.

[0005]

SUMMARY OF THE INVENTION An uninterruptible power supply bypass device for an instrument according to the present invention is a means for engaging a screw portion or the like which can be engaged with a screw portion such as a screw hole of a terminal T of a terminal block A of an instrument M at an end thereof. A wire pressure welding tool 1 provided with a brush 11 having a bundle of thin metal wires and the like housed therein so as to be able to protrude and retract from the distal end thereof by means of advance and retreat means 12 such as a set screw; A guide projection 21 for the electric wire holding and moving body 3 is provided at a rear portion.
Are integrally formed, and insertion holes 22 for inserting the electric wire pressure welding tool 1 are provided on the front surfaces on both sides of the mounting portion at positions matching the locking portions K of the terminal fittings T in the same phase. The mounting body 2 provided with the insertion hole 23 of the guide shaft 41 of the bypass connector 4 at the center, and the insertion portions 31, 31 of the connection electric wire D are formed on both sides of the extension of the axis of the in-phase terminal fitting T, An electric wire nipping moving body 3 provided with nipping means 33 such as a nipping member which is moved up and down by a tightening means 32 such as a screw rod, and provided with the guide projection 21 so as to be slidable by a predetermined stroke.
0, and a bypass connecting conductor 4 that can connect the end of the in-phase connecting wire to the lower portion thereof.
2, a bypass connector 4 provided in the insertion hole 23 of the mounting body 2 so as to be able to ascend and descend a predetermined stroke, and a U-shaped fitting that can be fitted to the convex portion 21 for guiding. The electric wire pressing unit 5 includes electric wire pressing parts 50, 50, and an electric wire pressing tool 5 provided with screwing means 51 such as a screw rod which is screwed into the screw hole 40 of the guide shaft 41 in the center.

[0006] The screw B1 of the terminal fitting T for tightening and connecting the end of the electric wire is removed, and the placing portion 20 of the placing body 2 is placed in a state in which the electric wire holding and moving body 3 is pushed into the placing body 2 and brought into contact therewith. It is placed on the terminal block A of the instrument, and the pair of connecting wires D in the same phase is clamped by the clamping means 33 on both sides of the wire clamping and moving body 3, and the wire pressure welding tool 1 is inserted through the insertion holes 22, 22 of the placing section. The terminal 11 is engaged with the terminal fitting T of the same phase on the terminal block A, and the brush 11 is advanced by the advancing / retracting means 12 so that the end of the electric wire is elastically pressed into contact with the terminal fitting of the instrument.

After setting as described above, the screw B2 for fixing the end of the electric wire is loosened, and the electric wire sandwiching moving body 3 is moved from the placing body 2 to the brush 11 and the end of the electric wire by a predetermined stroke while being held in contact. The wire end E is drawn out from the terminal block A to expose a part thereof.

Then, the electric wire pressing tool 5 is fitted on the convex portion 21 of the mounting body 2 and the fastening means 51 is positioned below the mounting body 2 and the electric wire holding and moving body 3 by bypass. The ends of the electric wires of the same phase, which are screwed and fastened to the guide shaft 41 of the connector 4 and exposed, are connected by the bypass connection conductor 42 of the bypass connector 4 to form a bypass path. Thereafter, the wire pressure welding tool 1 is removed and the gauge is freely replaced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1, 4 and 8, an electric wire pressure welding tool 1 provided on a mounting body 2 according to the present invention has an upper outer periphery 13 having a hexagonal shape and a mounting end mounted on a distal end side. The tapered portion 14 for suppressing the tapered insertion hole 22 of the container body 2 is provided, the screw portion 10 is provided at the tip thereof as a locking means, and the brush 11 is turned inside. An end E of the connection wire D in which a brush to be advanced is inserted into the terminal fitting T of the terminal block A so as to be able to protrude and retract from the tip.
Can be elastically pressed against the surface of the instrument, and even if the connecting wire D is moved, the instrument terminal and the wire are surely kept in contact with each other.

As shown in FIGS. 1 to 3 and 5, the mounting body 2 integrally forms a rectangular mounting portion 20 on the front surface and a stepped guide convex portion 21 at the rear center. Insertion holes 22, 22 are formed by cutting out a part of the front surface on both side front surfaces of the portion.
A stopper 24 is formed at the rear end of the terminal 1 so that the mounting portion 20 can be mounted on the terminal block A.

As shown in FIGS. 1 to 3 and FIG. 5, the electric wire holding and moving body 3 is provided with a connecting wire insertion portion 31 on both sides of the body 30.
The holding member 33 is fixed to the screw rod 32 of the fastening means on both sides of the moving body 3 so that the holding member 33 can be moved up and down in the recess 31 by the rotation of the screw rod 32, and the lower part of the recess 31 and the holding member At 33, the connecting wire D connected to the terminal fitting T of the terminal block A can be held.

An insertion hole 34 for inserting the guide convex portion 21 of the mounting device 2 is provided at the center upper portion of the electric wire holding and moving body 3, between the bypass connector 4 and the stopper 24 at the rear end of the convex portion 21. Slidable by a predetermined stroke.

As shown in FIGS. 1 to 3 and 5, the bypass connector 4 has a guide shaft 41 having a screw hole 40 in the upper center.
And a bypass connecting conductor 42 is built-in at the bottom, and a protruding shaft 44 such as a screw of the mounting body 2 is engaged with the long hole 43 of the guide shaft 41 to connect the guide shaft 41 to the body 2. Is provided so as to be able to ascend and descend by a predetermined stroke in the insertion hole 23.

Further, as shown in FIGS. 1, 3 and 5, the wire pressing tool 5 is formed in a U-shape so as to be fitted to the step of the convex portion 21 of the mounting body 2. A screw rod 51 is provided at the center, and the screw rod 51 is screwed into the screw hole 40 of the bypass connection tool 4 and tightened. Exposed end E
To take a bypass.

Next, referring to FIGS. 11 to 14, a description will be given of a case where the terminals of the integrating wattmeter are bypass-connected and the meter M is replaced by the uninterruptible bypass device for a meter according to the present invention. For example, two sets of bypass connection devices having different positions of the insertion holes of the mounting portion of the mounting body are prepared so as to match the same-phase terminal positions of the terminal block of the instrument.

The state shown in FIG. 1 is an assembling structure before the operation of replacing the instrument. In a state in which the bypass connector 4 is lowered, the electric wire holding and moving body 3 is placed on the mounting portion of the mounting body 2. The electric wire pressing tool 5 is temporarily fixed to the screw hole 27 at the end of the convex portion 21 of the mounting body with a screw rod 51 and fixed.

In preparation for the replacement instrument, although not shown, the fixing screw of the instrument body is loosened so that the bottom surface of the instrument M is floated on the float S or the like so that the bypass device of the present invention can be mounted. The order of connection is as follows: first, the inner common-mode terminals 2S and 2L shown in FIG. 6 are bypass-connected, and 1S and 1L are connected later.
This figure shows a 1L instrument uninterruptible bypass device. The structure and bypass procedure are exactly the same, except that the terminal interval is long.
After the bypass connection between 2S and 2L is completed, the outer 1
S, remove the screw B1 on the inlet side of the terminal tube T for connecting the connection wire of 1L.

As shown in FIGS. 8 and 12, the mounting portion 20 of the mounting body 2 is mounted on the terminal block A in the state shown in FIG. 1, and the mounting device is inserted into the screw hole K from which the screw B1 is removed. The insertion holes 22, 22 on both sides of the body 2 are aligned with each other, and the wire pressure welding device 1 of FIG. The screw portion 10 at the tip is screwed into the screw hole K of the terminal tube T, and the support tube 16 is mounted on the upper surface of the terminal tube.
And the clamping members 33 on both sides of the electric wire clamping and moving body 3 are lifted and opened to insert the covering portion of the connection electric wire D, and then the screw 32 is turned to hold the clamping members. It is sandwiched between the V-grooves 33a and 31a between 33 and the lower surface of the concave portion. Also, the wire pressing tool 5 temporarily fixed to the screw 27 of the projection 21 is removed.

Next, as shown in FIG. 4 and FIG.
, And elastically presses against the end E of the connection wire D to maintain the electrical contact between the end E and the terminal tube T. Thereafter, the screw B2 at the back of the terminal block A is loosened, and the wire is pinched and moved. The body 3 is pulled out from the mounting body 2 by a predetermined stroke, and the end E is drawn out of the terminal tube T under the state of electrical contact by the brush 11 to expose a part of the end E from the terminal tube T.

Next, as shown in FIGS. 10 and 14,
The wire pressing tool 5 is fitted on the step of the convex portion 21 between the mounting body 2 and the drawn wire holding and moving body 3, and the screw 51 at the center of the wire connecting tool 5 is placed on the lower side of the bypass connecting tool 4. Guide shaft 4
1 by screwing the screw hole 40 and turning the screw rod 51 to pull up the bypass connecting tool 4 by a predetermined stroke along the elongated hole 43 to thereby bypass the bypass connecting conductor 42 and the wire pressing portion 5 on the lower surface of the wire pressing tool 5.
The end E exposed at 0 is sandwiched to form a bypass circuit. Thereafter, the push screw 12 of the wire pressure welding device 1 is turned in the opposite direction to retreat the brush 12, the protection tube 15 of the wire pressure welding device 1 is turned in the reverse direction to remove it from the mounting portion, and the wire D At the same time, it is pulled out from the terminal block A and separated.

As described above, four of the connection wires D of the terminal block A are connected to the outside and inside, and the inside and the inside are connected in parallel by the same phase first, so that the bypass-connected connection wires do not disturb the unworked wires. After bending to the position and two sets of bypass paths are made and all of them are removed from the terminal block, the meter M is removed and replaced.

When the removed bypass connection device is connected to the terminal block A in place of another meter, the reverse operation of the above method may be performed.

The connection is made first from the bypass device which connects the external homologs by bypass. That is, in a state where the electric wire sandwiching moving body 3 is pulled out, each connection electric wire D is inserted into the terminal tube T of the terminal block A of the new instrument M, and the mounting portion 20 of the mounting body 2 is inserted.
Is placed on the terminal block A, the wire pressure welding device 1 is inserted into the insertion hole 22, the screw portion 10 is screwed into the screw hole K, and the push screw 12 is turned to press the brush 11 against the connection wire D to press the end portion. And the electrical contact between the terminal tube and the terminal tube is maintained.

Thereafter, the screw 51 of the wire pressing tool 5 is removed from the screw hole 40 of the bypass connecting tool 4, the wire pressing tool 5 is removed from the projection 21, and the bypass connecting tool 4 is lowered. The pinching moving body 3 is pushed into the mounting body 2, the inner screw B2 is screwed into the screw hole to press the end E, and then the electric wire pressing device 1 is removed from the screw hole K. The clamping of the electric wires on both sides is removed, the bypass connection device is removed, and the screw E1 is screwed into the screw hole K on the inlet side to press the end E in pressure.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. 6, 8, and 11, A is a terminal block of the integrating wattmeter M. The synthetic resin body 60 has a power source side and a load side, each having a circular hole at the entrance of each connection wire and a square hole at the back. The conductive terminal tube T for inserting and connecting the connection wire D from the inside of the instrument is inserted into the square hole of each insertion hole 61, and the end E of the connection wire D is inserted from the front of the insertion hole 61.
, And screws B1 and B2 are screwed into a pair of screw holes K of the terminal tube T from the upper opening 62, and the ends E are tightened and connected in the terminal tube T. The terminal tube T is connected to the wiring in the instrument. The terminals are arranged from the left on the power supply side 1S, 2S, and then on the load side 2L, 1L.

In FIG. 4, the electric wire pressure welding tool 1 has a support cylinder 16 fixed with set screws in a synthetic resin insulating protection cylinder 15 which is inserted and fitted into tapered insertion holes 22, 22 of the mounting body 2 described later. A stepped portion 17 and a screw portion 10 that can be screwed into the screw hole K of the terminal tube T are provided at the tip of the terminal tube. The upper end of a brush 11 in which elastic metal thin wires are bundled is compressed and fitted to the lower part of the set screw 12, and the set screw 12 is turned to make the brush 11 protrude and retract from the tip of the support cylinder.
With the rotation of 1, the surface of the end portion E of the connection wire D is elastically brushed and pressed into contact with the round surface of the wire, and in the case of a stranded wire, it enters between the twisted portions and slides the connection wire. Even so, the contact with the terminal tube T can be reliably maintained.
The wire can press mark by screws B _1, but can move without resistance from the pressure contact with the brush is resilient.

In the embodiment, phosphor bronze or brass thin wires are bundled in the metal wires in order to prevent damage to the electric wires and to provide conductivity.
Although the deformation of the tip due to the pressure contact is restored by the elasticity of the brush, it can be used repeatedly because the inner wall of the support cylinder 16 is returned straight by loosening the push screw 12.

The insulation protection tube 15 of the wire pressure welding device 1 of the embodiment has a hexagonal shape so that the upper outer periphery 13 can be easily turned by hand, and has a tapered insertion hole 22 of the mounting body 2 at the tip end. A tapered portion 14 for suppressing the pressure is provided, and a tapered insertion hole 22 is provided.
To the screw hole K of the terminal tube T, turn the protective tube 15 to screw and fix the screw portion 10 at the tip, and turn the internal push screw 12 to turn the end portion E of the connection wire D with the brush 11. Is brushed and elastically pressed to maintain contact between the terminal tube T and the connection wire.

In FIGS. 1 to 3 and 5, the mounting body 2 is made of a synthetic resin, and a stepped projection 21 is integrally formed at a right angle at the rear center of the rectangular mounting portion 20 on the front surface. Station 2
0, insertion holes 2 with tapered recesses 25, 25 at both corners
2 and a support member 26 having a part of the front face notched.
Are fixed with screws, and penetrate the insertion hole 23 for inserting the guide shaft 41 of the bypass connector 4 into the center of the step 21a of the stepped projection 21, and fit the wire pressing tool 5 at the rear end of the projection. A screw hole 27 for screwing the threaded rod 51 of the wire pressing tool 5 is provided for temporary fixing, and a stopper 24 is formed on the lower surface of the rear end thereof. A predetermined stroke L1 between the rear end of the body 3 and the stopper
Only slidable.

In FIGS. 5, 6 to 9, the wire pinching / moving body 3 is provided with a concave portion 39 at the center of the front surface of a rectangular synthetic resin container 30, a stepped concave portion 34a at the upper portion, and both sides. A concave portion 31 is provided, a stepped screw hole 35 is provided through the concave portion 31 from both upper sides thereof, and a screw rod 32 is screwed into the concave portion 31.
2, a holding member 33 is screwed into the lower end of the second member 2, and the screw is fixed from the side with a screw 36, and the holding member 33 is provided so as to be able to move up and down by the rotation of the screw 32.
Of the wire D can be clamped at the lower part of the wire. Nipping member 3
V-grooves 33a and 31a for sandwiching the covered portion of the electric wire are formed on the lower surface of the base 3 and the opposing surface of the recess 31.

A stepped recess 34a at the upper center of the body 30 is formed to a depth to which the projection 21 is fitted, and a cover plate 37 is put on the upper step and fixed with screws 38 to form a square insertion hole. 34, and the recess 39 at the center of the front surface is
The first step portion 21a and the convex portion 46 of the bypass connector 4 are formed so as to be fitted to each other.
Is slidable by a predetermined stroke L1 between the rear end of the container 30 and the stopper 24 at the rear end of the convex portion, and a bypass connector 4 to be described later is inserted into the insertion hole 23 along the concave portion 39 of the electric wire nipping moving body 3. It is provided so as to be able to move up and down by a predetermined stroke L2 shown in FIG.

In FIG. 5 and FIGS. 7 to 10, the bypass connector 4 is provided with a convex portion 46 having a hollow inside and a cylindrical guide shaft 41 at the upper center of a rectangular synthetic resin container body 45 having an open upper surface. A substantially similar conductive bypass connection conductor 42 is built in the container body 45, the convex portion 46, and the guide shaft 41, the bottom plate 47 is fixed, and the inside of the convex shaft 48 of the bypass connection conductor 42 is formed. The cylindrical guide shaft 41 is provided with an elongated hole 43 for regulating the elevation of the bypass connector 4 by a predetermined stroke L2. A screw 44 is screwed from the rear surface of the housing 21 to face the elongated hole 43, and the guide shaft 41 of the bypass connector 4 is provided in the insertion hole 23 of the body 2 so as to be able to move up and down by a predetermined stroke L2. An arc-shaped concave portion 45a for inserting an electric wire is formed on the upper surface on both sides of the container body 45, and the bypass connection conductor 4 is formed.
2 also has a concave holding portion 42 for holding the end of the electric wire on both upper surfaces.
a is provided.

In the above embodiment, the convex shaft 48 is provided at the center of the bypass connection conductor 42, and the screw hole 40 is provided in the convex shaft 48. However, the present invention is not limited to this, and the guide shaft 41 made of synthetic resin is directly provided. It is also possible to provide screw holes.

5, 10 and 14, the wire pressing member 5 is made of a synthetic resin and is formed in a U-shape having a concave portion having a width which can be fitted into the step portion 21a of the convex portion 21 of the mounting body 2. And
An insertion hole 52 is formed at the center thereof, and a screw rod 51 having a screw portion 51a is provided at a lower portion. The wire pressing tool 5 is fitted into the step portion 21a from above, and the screw portion 51a of the screw rod 51 is connected to the bypass connector 4 By screwing and screwing into the screw hole 40 of the convex shaft 48 at the center of the bypass connection conductor 42, the bypass connection tool 4 is guided by the elongated hole 43 to raise the predetermined stroke L2, and the wire pressing on the lower surface on both sides of the wire pressing tool 5 is performed. The ends E exposed by bringing the portions 50 and 50 close to the bypass connection conductor 42 are sandwiched to form a bypass circuit. The wire pressing portions 50, 5
0 also has a recess 50a so as to make it easier to hold the end E of the electric wire.

[0035]

According to the instrument uninterruptible bypass device of the present invention, in instruments such as an integrating wattmeter, two sets of bypass means using screw holes in a terminal block are conventionally used for bypass connection between the same phases. What used to be a pair of bypass connectors having connectors at both ends of the electric wire drawer and the bypass line is made compact by using a completely different set of structural configurations. It is only necessary to have two sets of this bypass device which differ only in the length between them. Unlike the case where each terminal is connected for each terminal, there is no risk of erroneous connection, there is no problem, simple operation without complexity, simple and quick bypass connection Became possible.

At the time of replacing the instruments, the highly reliable uninterruptible instrument replacing work became possible, and the efficiency and speed of the entire replacement work could be improved. Note that, regardless of the integrated power meter of this embodiment, the terminal arrangement of other meters and instruments is arranged in series on the power supply side and the load side, and the terminal shape on the instrument side is cylindrical and a plurality of screws are used from the outside. The present invention can be used for bypass of instruments having a structure for pressing and connecting connection wires.

[Brief description of the drawings]

FIG. 1 is a perspective view of an instrument uninterruptible bypass device of the present invention.

FIG. 2 is a perspective view of a state where an electric wire holding and moving body is pulled out.

FIG. 3 is a perspective view showing a state in which an electric wire pressing tool is fitted.

FIG. 4 is a partially cutaway front view showing an electric wire pressure welding tool.

FIG. 5 is an exploded perspective view of the bypass connection device.

FIG. 6 is a plan view of the bypass connection device.

FIG. 7 is a front view of the same half section.

FIG. 8 is a longitudinal sectional view of the same.

FIG. 9 is a vertical cross-sectional view of a state in which the electric wire holding and moving body is pulled out.

FIG. 10 is a longitudinal sectional view showing a state where an electric wire pressing tool and a bypass connecting tool are tightened.

FIG. 11 is a perspective view of a main part of the instrument.

FIG. 12 is a perspective view showing a state where a bypass connection device is set on a terminal block of the instrument.

FIG. 13 is a perspective view showing a state where a terminal is pulled out by the electric wire holding and moving body.

FIG. 14 is a perspective view showing a state in which an end of an electric wire is sandwiched between an electric wire pressing device and a bypass connecting device and a bypass is taken.

[Explanation of symbols]

 Reference Signs List A terminal block B1 screw B2 screw D connecting wire E end T terminal tube K screw hole 1 wire pressure welding device 10 screw portion 11 brush 12 push screw 2 mounting body 20 guide convex portion 21 mounting portion 22 insertion hole 23 Insertion hole 3 Electric wire holding and moving body 32 Screw rod 33 Holding member 4 Bypass connector 40 Screw hole 41 Guide shaft 42 Bypass connection conductor 5 Electric wire 50 Electric wire pressing portion 51 Screw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Fukuzawa 100 Azumacho, Iida-shi, Nagano Chubu Electric Power Co., Inc. Iida branch (72) Inventor Hiroyuki Watanabe 1-1-15 Minami-Yatacho, Higashi-ku, Nagoya-shi, Aichi Chubu Chubu Inside Keiki Kogyo Co., Ltd. (72) Inventor Kazuhisa Nabeno 108 Kasugai-cho, Kasugai-shi, Aichi Prefecture Furukawa Electric Co., Ltd. Kasugai Plant

Claims (1)

(57) [Claims] 1. An end portion is provided with a locking means (10) such as a screw portion which can be locked in a locking portion (K) of a terminal fitting (T) of a terminal block (A) of a meter. A brush (11), which is a bundle of thin metal wires and the like, is pushed and retracted by a pushing screw (1).
Wire crimping fixture (1) provided to be able to protrude from the tip by 2)
And a mounting portion (20) for mounting the terminal block (A) on the front surface and a guide convex portion (21) for the wire clamping and moving body (3) on the rear portion are integrally formed. Insertion holes (22) and (22) for inserting the wire pressure welding tool (1) are provided at positions matching the locking portions (K) of the terminal fittings (T), and a bypass is provided at the center of the projection (21). The mounting body (2) provided with the insertion hole (23) for the guide shaft (41) of the connecting tool (4) and the connecting wire (D) in the extension of the axis of the in-phase terminal fitting (T) on both sides. The insertion protrusions (31), (31) are provided, and a holding member (33) such as a holding member that is moved up and down by a screwing means (32) is provided.
And a guide shaft (41) having a screw hole (40) in the upper center and an end of the in-phase connection wire connected to a lower portion. A bypass connection conductor (42),
A bypass connector (4) provided in the insertion hole (23) of the mounting body (2) so as to be able to move up and down by a predetermined stroke, and a U-shape that can be fitted to the guide projection (21); An electric wire pressing tool (5) having electric wire pressing portions (50) and (50) on both lower surfaces thereof and having a screw or other tightening means (51) screwed into the screw hole (40) of the guide shaft (41) at the center. And a pair of connecting wires (D) having the same phase are held by holding means (33) on both sides of the wire holding moving body (3), and the wire pressure welding tool (1) is inserted through the insertion hole (22) of the mounting portion. It is engaged with the terminal fitting (T) of the terminal block (A), and is held in electrical contact with the end of the electric wire by the brush (11). Is drawn out by a predetermined stroke to expose the end of the electric wire, and the electric wire pressing tool (5) is fitted to the mounting body (2) to tighten the fastening means (51). More wire pusher (5) and the bypass connector (4) clamping the wire ends exposed at by instrument uninterruptible bypass device being characterized in that to obtain take bypass.