JPH059133U - Low voltage cable connection - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a low-voltage cable connection part having a smaller outer diameter of the connection part and improved workability. [Structure] A low-voltage cable connection part in which conductors are connected by a lock-type tulip contact method, and a mechanism is provided on the outside of the conductor connection part so that the lock is not easily released.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a branch line connecting portion of a low-voltage trunk cable with a prefabricated branch line used in buildings, apartment houses, and the like.

[0002]

[Problems to be solved by conventional techniques and devices]

 An example of a low-voltage trunk cable with a prefabricated branch line is "cable line structure in low-voltage trunk line" disclosed in Japanese Patent Laid-Open No. 64-38974. The connection portion in the branch line of the conventional low-voltage trunk cable has no lock mechanism or has a structure in which a cap nut is provided as a lock mechanism in the main body of the connection portion and screwed.

Generally, a low-voltage trunk cable with a prefabricated branch line is installed by drawing it on an electric shaft of a building or the like. However, since the floor penetration part is subjected to fireproof partition treatment after installation, it is necessary to make the opening as small as possible. It is also necessary to make the connected parts as small as possible. Therefore, it is difficult to provide a lock mechanism to reduce the outer diameter of the connecting portion, and the cap nut type lock mechanism has a problem that the outer diameter is too large to pass through the floor penetration portion.

[0004]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems and provides a low-voltage cable connecting portion in which the outer diameter of the connecting portion is reduced and the workability is improved. The lock is not easily released on the outside of the conductor connection.

[0005]

【Example】

 FIG. 1A is a side view showing an upper half longitudinal section of a concrete example of a connecting portion of a low voltage cable according to the present invention. As shown in the drawing, a male terminal 2 forming a tulip contact is attached to the tip of a conductor 11 of one low-voltage cable 1, and a female terminal 3 is attached to the tip of a conductor 11 of the other low-voltage cable 1. Is mounted, and the male terminal 2 and the female terminal 3 are fitted to each other to form a connecting portion of the conductor 11. A lock mechanism 6 is formed at the fitting portion between the male terminal 2 and the female terminal 3.

A cover A 4 is attached to the outside of the male terminal 2, and a cover B 5 is attached to the outside of the female terminal 3. The two are fitted to each other at their tips to insulate and protect the internal conductor connection. On the cover B5, an opening 71 is provided in a part of the circumference, as shown in FIG. 1B, in a gap provided between the cover B5 and the tip of the cover A4 for unlocking. For example, a ring-shaped collar 7 made of hard plastic is attached to prevent the lock mechanism 6 from being easily released. The other ends of the covers A4 and B5 are located on the low voltage cable 1 and are connected to the watertight structure 8 by a self-bonding tape and a protective tape.

On the surface of the cover A4, a thermo label 9 is attached so that the abnormal temperature rise due to improper fitting of the connecting portion, overcurrent energization and the like can be checked. A charging indicator 10 is attached to the low-voltage cable 1 near the connection so that the charging status of the cable can be checked at a glance and safe insertion and extraction work can be performed. The charging indicator 10 may be attached to the main body of the connecting portion, but it is preferably attached to the low voltage cable 1 in order to reduce the outer diameter of the connecting portion.

FIG. 2 is an explanatory view of a lock mechanism and its operation in the present invention. As shown in FIG. 2A, an annular groove 21 is formed behind the tip of the male terminal 2, and a collar 22 is attached to the annular groove 21. The width of the annular groove 21 is larger than the width of the collar 22, which allows the collar 22 to move in the annular groove 21 in the length direction of the male terminal 2. On the other hand, an annular groove 31 is formed on the inner peripheral surface of the female terminal 3, and a spring ring 32 is mounted in the annular groove 31.

To fit the male terminal 2 and the female terminal 3, as shown in FIG. 2B, the male terminal 2 is inserted into the female terminal 3 in the direction of the arrow in the figure. At this time, the spring ring 32 of the female terminal 3 falls into the annular groove 21 of the male terminal 2 and is locked. In this state, if the ring-shaped collar 7 is installed in the gap between the tip of the cover B5 and the tip of the cover A4, the male terminal 2 cannot be pushed further in, so the above state is maintained, and the operation after installation is incorrect. You can prevent it from being pulled out.

When pulling out the male terminal 2, first, the ring-shaped color 7 mounted on the cover B is removed. In this state, as shown in FIG. 2C, the male terminal 2 is further pushed in the direction of the arrow in the figure. This opens the spring ring 32 and rides on the collar 22 of the male terminal 2. In this state, when the male terminal 2 is pulled in the direction of the arrow in the figure, the collar 22 on which the spring ring 32 is mounted slides in the annular groove 21 to the right in the figure, and the male terminal 2 can be pulled out.

[0011]

[Effect of the device]

 As explained above, according to the connection part of the low-voltage cable of the present invention, it is possible to reduce the outer diameter of the connection part by connecting the conductor with the tulip contact method with a lock, which is 70% of the conventional cap nut type. It can be done to a certain degree, and the work of passing a floor through opening in an electric shaft of a building or the like becomes easy. Also, since the lock is not easily released on the outside of the conductor connecting portion, it is possible to prevent the operator from mistakenly pulling out after the installation. Furthermore, since a charging indicator is attached, it is possible to ensure safety when attaching and detaching.

[Brief description of drawings]

FIG. 1 (a) is a side view showing an upper half longitudinal section of a concrete example of a connection portion of a low-voltage cable according to the present invention, FIG.
(B) is an explanatory view of a ring-shaped collar.

2A to 2D are explanatory views of a lock mechanism and its operation in the present invention.

[Explanation of symbols]

 1 Low-voltage cable 2 Male terminal 3 Female terminal 4 Cover A 5 Cover B 6 Lock mechanism 7 Ring-shaped collar 8 Watertight connection 9 Thermo label 10 Charge indicator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Kazuo Nishida 2-17 Shiba 2-chome, Minato-ku, Tokyo Sumitomo Electric Co., Ltd. Tokyo Extension Division

Claims (1)

[Claims for utility model registration] [Claim 1] In a low-voltage cable with a prefabricated branch line having a connection part in the middle of the branch cable, the conductors are connected by a tulip contact method with a lock, and the conductors are connected to the outside of the conductor connection part. Is a low-voltage cable connection characterized by a mechanism that does not allow the lock to be released easily.