JP2000323198A - Cable connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cable from slipping off without holding the cable even when unexpected force is applied. SOLUTION: This cable connection device has a pair of connection terminals 1, 2 connected with an electric power cable C and having an engaging portion on an outside surface, a plurality of coupling pieces 3 disposed in the peripheral direction of the connection terminals 1, 2 to couple the connection terminals 1, 2 by engaging to the engaging portion when the pair of connection terminals 1, 2 are connected, an elastic member fitted into a groove 5 formed at an outer edge of the coupling pieces 3 to surround the coupling pieces 3 such that the connection terminals 1, 2 come to the center, and a cylindrical member fitting with a series of the coupling pieces 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connecting device which can be connected or detached by inserting or pulling out a power cable or the like, and more particularly to a cable connecting device used for a power cable device such as a terminal box or a connecting box. The present invention relates to a cable connection device having a mechanical lock mechanism in a detachable method, which is one of connection methods.

[0002]

2. Description of the Related Art As a conventional cable connecting device, there is known an electric connecting body disclosed in Japanese Utility Model Laid-Open No. 4-10963. This is a so-called tulip contact structure. FIG. 3 is a side view showing a conventional cable connecting device, and FIG. 4 is a side view showing an operation of the conventional cable connecting device.

[0003] As shown in FIG. 3, a connecting body 104 is provided across a terminal electric conductor 100 having a circular cross section on the fixed side of the power cable and a terminal electric conductor 101 having a circular cross section attached to the end of the lead conductor of the power cable. Are arranged in each circumferential direction. The terminal electric conductor 100 has an outwardly protruding engaging portion 100a formed at the tip. Further, the terminal electric conductor 101 is formed with a protruding engagement portion 101a, and further formed with a tapered surface 101b tapering toward the tip. This connection body 104 is connected to the connection piece 102,
The connection piece 102 is made up of a coil spring 103 that presses the connection piece 102 in the direction of the terminal electric conductors 100 and 101. The coil spring 103 is set in a groove 105 formed in the connection piece 102. The connection pieces 102 are respectively terminal electric conductors 100,
The connection small pieces 102 are arranged along the circumferential direction of 101, and are pressed by the elastic force of the coil spring 103 and engaged with the outwardly protruding engaging portions 100 a and the protruding engaging portions 101 a.

Next, the operation of the conventional cable connection device will be specifically described with reference to FIG. When connecting the power cable, as shown in FIG.
01, the connecting piece 102 rotates in the direction B, the coil spring 103 expands and expands, and the power cable can be inserted. The terminal electric conductor 101 is connected to the terminal electric conductor 100, and the engaging portion of the connecting piece 102 102b is the protruding engagement portion 1
01a. When the power cable is to be removed, as shown in FIG.
When the connecting piece 1 is pulled along the contact slope of the protruding engagement portion 101a with a part of the
When the engagement portion 102b of No. 02 moves and the connection piece 102 rotates in the direction B, the connection piece 102 is lifted. That is, the protruding engagement portion 101a of the terminal electric conductor 101
The coil spring 103 is pushed open by a predetermined force due to the inclination of the spring, and the engagement is released. By pulling out the terminal electric conductor 101 from the connection body 104 in this manner, the connection body 104 is kept connected to the terminal electric conductor 100 and the terminal electric conductor 10
The terminal electric conductor 101 is cut off from 0. In this manner, connection or detachment of the power cable can be performed by inserting or pulling out only the power cable.

[0005]

However, in the conventional cable connection device disclosed in Japanese Utility Model Laid-Open No. 4-10963, if an unexpected force acts on the power cable after connecting the power cable, There is a problem that the power cable is disconnected.

Therefore, in order to solve this problem, measures have conventionally been taken to prevent the power cable from coming off, such as by providing means for gripping the power cable outside the connection portion.

[0007] The present invention has been made in view of the above problems, and a cable capable of preventing the cable from being detached without gripping the cable even when an unexpected force is applied. It is intended to provide a connection device.

[0008]

A cable connecting device according to the present invention includes a pair of connecting terminals to which a power cable is connected and which has an engaging portion on an outer surface, and a plurality of connecting terminals arranged in a circumferential direction of the connecting terminals. When the pair of connection terminals are in a connection state, the connection terminals engage with the engagement portions and connect the connection terminals, and a plurality of connection pieces are fitted in grooves formed on the outer edges of the connection pieces, and An elastic member surrounding the connection piece around the connection terminal and a cylindrical member fitted with the series of connection pieces are provided. In this case, the power cable is, for example, a crosslinked polyethylene power cable (CV cable).

Further, it is preferable to have a stopper for preventing the cylindrical member from coming off in the axial direction of the connection terminal.

In the present invention, a plurality of connecting pieces are arranged in the circumferential direction of a connection terminal having an engaging portion formed on an outer surface for connecting a power cable by engaging with the engaging portion. By providing an elastic member in a groove formed in the connecting piece and providing a cylindrical member in which a series of connecting pieces are fitted, when an unexpected force is applied to the power cable, the elastic force of the elastic member is prevented. Even when the connecting piece moves, the contact piece comes into contact with the cylindrical member, and the movement of the connecting piece is regulated. Therefore, the engagement between the connection terminal and the connecting piece is not released, and the power cable can be prevented from coming off. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cable connection device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a cable connection device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of FIG.

In this embodiment, as shown in FIG.
The first connection terminal 1 and the second connection terminal
Are connected by a tulip contact 10. The collar 6 is arranged on the outer periphery of the tulip contact 10 as a cylindrical member. Color 6
A stopper 7 is provided at an end of the collar 6 so that the axial position of the first connection terminal 1 of the collar 6 does not shift. A pre-mold insulator 8 is provided at an end of the stopper 7. Thus, the power cable C is insulated. The pre-mold insulator 8 is pressed by the pre-mold insulator pusher 11 in the insertion direction of the power cable C.

The first connection terminal 1 has a circular cross section, and has an engaging portion 1a. From this engaging portion 1a, a tapered surface 1c is formed on the power cable C connection direction side, and a slope 1b is formed on the power cable C pull-out direction side. On the other hand, the second connection terminal 2 has a circular cross section, and an engagement portion 2a is formed at the tip.

The tulip contact 10 is
b, 3c and an engaging portion 3 of the connecting piece 3
b, 3c, and a coil spring 4 fitted into two grooves 5 formed respectively.

As shown in FIG. 2, a plurality of connecting pieces 3 are arranged in the circumferential direction of the first connection terminal 1 and the second connection terminal 2. At this time, the slope 1b of the first connection terminal 1 and the slope 3a of the connection piece 3 are engaged, and the engagement portion 2a of the second connection terminal 2 and the engagement portion 3c of the connection piece 3 are engaged. ing.
Further, a coil spring 4 is fitted as an elastic member in four grooves 5 formed on the outer edges of these connection pieces 3 so as to surround the first connection terminal 1 and the second connection terminal 2 as centers. The connecting piece 3 is pressed toward the center of the first connection terminal 1 and the second connection terminal 2 by the elastic force of the coil spring 4. Thereby, the first connection terminal 1 and the second connection terminal 2 are connected. Further, a collar 6 is arranged so as to fit these connecting pieces 3.

An engaging portion 1a from the shaft portion of the first connection terminal 1
When the distance (engagement height) up to the maximum height of the power cable C is a and the gap between the outer periphery of the coil spring 4 and the inner surface of the collar 6 is b, conditions for preventing the power cable C from coming off with an unexpected force. Is b <a. That is, if the engagement height is made larger than the gap, the amount of movement of the connecting piece 3 is restricted, and the power cable C can be prevented from being pulled out.

As described above, in this embodiment, after the first connection terminal 1 and the second connection terminal 2 are connected by a plurality of connecting pieces 3, a plurality of grooves formed on the outer edge of the connecting piece 3 are formed. 5, a coil spring 4 is fitted so as to surround the first connection terminal 1 and the first connection terminal 2 around the center, and a collar 6 is mounted on the outer periphery so as to fit these connecting pieces 3; Since the collar 6 is provided with the stopper 7 for preventing the collar 6 from shifting or coming off, the first connection terminal 1 and the second connection terminal 2 are connected to the connection piece 3. Then, the collar 6 is always located on the outer periphery of the tulip contact 10. For this reason, when an unexpected force acts on the power cable C, even if the engaging portion 3b moves along the slope 1b of the engaging portion 1a against the elastic force of the coil spring 4, that is, Is rotated in the direction B with a part of the connecting piece 3 as a fulcrum F, and the moving of the connecting piece 3 is restricted by the collar 6, so that the connection between the connecting terminal 2 and the connecting piece 3 is restricted. Will not be canceled. For this reason, the connecting piece 3 can be prevented from spreading, and the power cable C can be prevented from being pulled out. When the power cable C is pulled out, the power cable C can be pulled out with a predetermined force by retracting the pre-molded insulator 8 and shifting the stopper 7 and the collar 6.

In this embodiment, even when the stopper 7 is not provided in the structure, the collar 6 is fed along the outer periphery of the tulip contact 10 so that the collar 6 is positioned on the outer periphery of the tulip contact 10 by the pre-mold insulator 8 or the like. Accordingly, when an unexpected force acts on the power cable C, the connecting piece 3 can be prevented from spreading, and the power cable C can be prevented from being pulled out.

Further, in this embodiment, the present invention is applied to a prefabricated termination box which is an electrical insulation system using an insulator tube 9 (epoxy insulation unit) and a pre-mold insulator 8 (made of rubber). It is not limited to
The present invention can also be applied to a prefabricated connection box for connecting the power cables C.

[0020]

As described in detail above, in the present invention,
In the circumferential direction of the connection terminal having the engaging portion formed on the outer surface for connecting the power cable, a plurality of connecting pieces are arranged by being engaged with these engaging portions, and the grooves formed in these connecting pieces are provided in the grooves formed in these connecting pieces. By fitting the elastic member and providing a cylindrical member for fitting a series of connecting pieces, when an unexpected force acts on the power cable, the connecting piece moves against the elastic force of the elastic member. Also, the contact of the connecting piece with the connecting piece is not released since the contact of the connecting piece and the connecting piece is restricted, so that the power cable can be prevented from coming off. Further, since there is no need to provide a means for gripping the power cable, the structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a cable connection device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of FIG.

FIG. 3 is a side view showing a conventional cable connection device.

FIG. 4 is a side view showing the operation of the conventional cable connection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; 1st connection terminal 1a, 2a, 3b, 3c, 102a, 102b; Engagement part 1b, 3a; Slope 1c, 101b; Tapered surface 2: Second connection terminal 3; Connection piece 4, 103; Coil spring 5 , 105; groove 6; collar 7; stopper 8; pre-mold insulator 9; insulator tube 10; tulip contact 11; pre-mold insulator pusher 100, 101; terminal electric conductor 100a; Joint 102; Connection piece 104; Connection A, B; Direction C; Power cable F;

Claims (2)

[Claims] 1. A pair of connection terminals to which a power cable is connected and which has an engagement portion on an outer surface, and a plurality of connection terminals arranged in a circumferential direction of the connection terminals when the pair of connection terminals are in a connected state. A plurality of connecting pieces that engage with the engaging portions and connect the connection terminals, and an elastic member that is fitted in a groove formed on an outer edge of these connection pieces and surrounds the connection pieces around the connection terminals. And a cylindrical member for fitting a series of the connecting pieces. 2. The cable connection device according to claim 1, further comprising a stopper for preventing the cylindrical member from coming off in the axial direction of the connection terminal.