JP2002233041A - Rubber sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber sleeve, which the installation to a box and the like is easy and has excellent properties of water proof, dust proof and oil proof. SOLUTION: The rubber sleeve has a sleeve main part 2 which is formed with the outer peripheral surface of a conical tapered shape and possible to fit into an electric wire pull-in opening 21 of the box and the like and has a single or a plurality of electric wire passing holes 3 and a sealing member 4 which is a skirt-like member connected to the end of the sleeve main part 2 at the larger diameter side and possible to fold back toward the smaller diameter side of the sleeve main part. Invasion of water, dust, oil is surely prevented by dual sealing effect of the seal by folding back the sealing member 4 and the seal by adhesion between the outer peripheral surface of the sleeve main part 2 and the inner peripheral surface of the electric wire pull-in opening 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber sleeve used for an electric device such as an industrial robot or an industrial machine, or a wire inlet of a control device box or a connection box.

[0002]

2. Description of the Related Art A box installed in a place where waterproofing, dustproofing, and oilproofing are required prevents water, dust, and oil from entering from a wire inlet of a cable or the like in addition to the waterproofing performance of the box itself. It must be structured.

[0003] As a wire penetrating tool used for such an application, a connector main body mounted on a wall of a box or the like,
A sleeve whose outer peripheral surface is processed into a conical taper shape, and a cap (cap nut) having a female screw that fits into a male screw formed in the connector main body. There is a cable connector having a structure in which a sleeve is compressed by screwing a cap into a connector main body, and an inner peripheral surface of the sleeve is brought into close contact with a cable jacket.

By the way, a ballast for a lamp is used in lighting equipment such as a road light. Ballast connection wiring
It is a plurality of loose wires (four to six single wires). Therefore, when wiring from the ballast is drawn into the box, conventionally, a cable connector having the above-described structure is used for each wire (single wire). A method has been adopted in which water, dust, and oil are prevented from invading by using or by inserting a porous rubber sleeve having a plurality of electric wire insertion holes into an electric wire inlet (boss portion).

[0005]

However, if a cable connector is used for each wiring (single line) such as the connection wiring of the ballast, the installation space for the connector becomes large, and the man-hour for installing the connector is increased, so that the construction work is increased. It takes a lot of time.

In addition, the number of parts per unit is large, and unless the tightening of the cap is maintained at an appropriate torque, predetermined waterproof and dustproof performance cannot be obtained.

On the other hand, when the porous rubber sleeve is used, the installation is simple and there is no problem of the connector space. However, if the porous rubber sleeve is simply fitted into the wire inlet, sufficient waterproof, dustproof and oil-proof performance can be obtained. Can not be secured.

The present invention has been made in view of such circumstances, and has as its object to provide a rubber sleeve which can be easily installed in a box or the like and has excellent waterproof, dustproof, and oil resistance.

[0009]

The rubber sleeve of the present invention is a rubber sleeve used for an electric wire lead-in port of a box or the like, the outer peripheral surface of which is formed in a conical taper shape, and in which one or more electric wires are inserted. A sleeve body having a hole, and a seal member formed of a skirt-shaped member connected to a large-diameter end of the sleeve body and capable of being folded back toward the small-diameter side of the sleeve body. It characterized by.

According to the rubber sleeve of the present invention, the electric wire is passed through the electric wire insertion hole of the sleeve main body, the sleeve main body is fitted into the electric wire inlet of the box, and then the sealing member is folded back to the small diameter side of the sleeve main body. Since the contact portion between the sleeve body and the wire inlet (boss) can be covered with a seal member (see FIG. 4), the sealing by the seal member, the outer peripheral surface (cone tapered surface) of the sleeve body, and the wire inlet are formed. Due to the double sealing effect of the seal due to the close contact with the inner surface (the inner surface of the boss), intrusion of water, dust and oil can be reliably prevented.

In the rubber sleeve of the present invention, a partition wall that can be broken through by an electric wire or a tool is provided in the electric wire insertion hole of the sleeve body, and the electric wire insertion is performed in accordance with the number of electric wires (single wires) drawn into the box. holes may be configured to opening the. When such a configuration is adopted, the range of the wire diameter or the number of wires that can be handled by one type of rubber sleeve is widened, so that the type of rubber sleeve can be reduced.

The material of the rubber sleeve of the present invention is not particularly limited, and rubber generally used in this type of rubber sleeve, for example, chloroprene rubber, butyl rubber, EPT or NBR can be suitably used. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view (A) and a central longitudinal section (B) of a rubber sleeve according to an embodiment of the present invention.

The rubber sleeve 1 shown in FIG.
The molded body is made of rubber such as BR, and the sleeve body 2 and the seal member 4 are integrally formed.

The sleeve body 2 has an outer peripheral surface formed into a conical taper shape. Since the outer diameter of the sleeve main body 2 is slightly larger than the inner diameter of a boss 21b of the box 10 described later, the outer peripheral surface (conical tapered surface) is brought into close contact with the inner surface of the boss 21b by pressing the sleeve main body 2 into the boss 21b for mounting. I do.

The sleeve body 2 is formed with six electric wire insertion holes 3 extending along the axial direction. These electric wire insertion holes 3 are arranged rotationally symmetrically with respect to the central axis of the sleeve main body 2. In each electric wire insertion hole 3, a partition wall (knockout member) 3a that can be pierced by a tool such as an electric wire or a cutting tool is provided.

The seal member 4 is a skirt-shaped (cylindrical) member extending with a uniform thickness from the periphery of the large-diameter end of the sleeve body 2 and can be folded back toward the small-diameter side of the sleeve body 2. Flexible.

Next, an example of a box to which the rubber sleeve 1 of the present embodiment is applied will be described with reference to FIGS. 2 (A) and 2 (B).

A box 10 shown in FIG. 2 is a box installed in a lighting pole such as a road lamp, and includes a box body 20 for accommodating a breaker, a terminal block (both not shown), and the like, and an upper lid 30. ing.

As shown in FIGS. 3A and 3B, the box body 20 is a rectangular container-shaped member (for example, made of resin) having an open front surface, and wire entry ports 21 are provided at four upper and lower locations. Have been.

The wire inlet 21 is connected to the box body 20.
Through hole 21a opened in the wall of
Is provided with a cylindrical boss 21b projecting outward from the periphery of the boss 21b. A locking projection 21c is formed on the entire periphery of the distal end of the boss 21b.

In the case where the rubber sleeve 1 of the present embodiment is used for drawing the electric wire into the box 10, FIG.
As shown in (A), the electric wire insertion holes 3 of the sleeve main body 2 are opened in accordance with the number of lead wires (for example, wiring of a ballast) to the box 10, and the electric wire W is inserted into each of the electric wire insertion holes 3. Let it through.

Next, as shown in FIG. 4B, the sleeve main body 2 is connected to the wire inlet 21 (the boss 21) of the box 10.
b) and push it in. By pushing the sleeve body 2 into the boss 21b, the sleeve body 2
The inner surface of each wire insertion hole 3 is compressed by the inner surface of b and the inner surface of each wire insertion hole 3 comes into close contact with the jacket of the wire W.

After the above mounting is completed, the sealing member 4 of the rubber sleeve 1 is folded toward the small diameter side of the sleeve main body 2 as shown in FIG. When the seal member 4 is turned over, the end of the boss 21b to which the sleeve body 2 is mounted is covered with the seal member 4 and the portion is sealed, so that the seal by the seal member 4 and the outer periphery of the sleeve body 2 Due to the double sealing effect of the seal due to the close contact between the surface (conical tapered surface) and the inner surface of the boss 21b, high waterproofness, dustproofness and oil resistance can be obtained.

Further, since the folded seal member 4 is hooked on the locking projection 21c at the tip of the boss 21b (FIG. 4).
(C)) Even if external force acts on the electric wire W, the sleeve body 2
There is no risk of problems such as moving in the removal direction or falling off, and stable sealing performance can always be maintained.

Here, in the present embodiment, the sleeve body 2
Since the partition wall 3a which can be broken through by a tool such as an electric wire or a cutting tool is formed in the electric wire insertion hole 3, the number of the electric wires W to be drawn into the box 10 is adjusted according to the number of the electric wires W. A usage method of piercing the wall 3a and opening the electric wire insertion hole 3 is possible. This gives 1
Since the range of the number of electric wires that can be accommodated by the type of rubber sleeve is widened (arbitrarily in the range of 1 to 6), the effect that the number of types of rubber sleeve can be reduced can be achieved.

In the above embodiment, six electric wire insertion holes 3 are arranged in the sleeve body 2. However, the present invention is not limited to this, and the number of electric wire insertion holes 3 may be one or more. it can be any number.

In the above embodiment, the electric wire insertion hole 3
Is provided with a partition wall 3a, but the present invention can be implemented even if the partition wall 3a is omitted.

Here, as the electric wires connected to lamps such as road lights, there are two-core and three-core cable wires (wire diameter:
φ10.5 to φ16.0), and a single-hole rubber sleeve 101 as shown in FIG. 5 is used for such a cable line.

The rubber sleeve 101 shown in FIG.
Alternatively, a sleeve molded body made of rubber such as NBR is used.
And the seal member 104 are integrally formed.

The sleeve body 102 has an outer peripheral surface formed into a conical taper shape. The outer diameter of the sleeve body 2 is
Since the inner diameter of the boss 21b of the box 10 is slightly larger than that of the boss 21b, the outer peripheral surface (conical tapered surface) is brought into close contact with the inner surface of the boss 21b by pushing the sleeve main body 102 into the boss 21b.

The sleeve main body 102 is formed with one electric wire insertion hole 103 extending in the axial direction. A partition wall (knockout member) 1 that can be pierced by a tool such as an electric wire or a cutting tool is provided at an end of the electric wire insertion hole 103.
03a is provided.

[0034] The sealing member 104 is
Is a skirt-shaped (cylindrical) member extending with a uniform thickness from the periphery of the large-diameter end portion, and has the flexibility to be folded toward the small-diameter side of the sleeve main body 102.

When the single-hole rubber sleeve 101 is used, the electric wire insertion hole 3 is opened, and the electric wire insertion hole 3 is
For example, after passing through the two-core or three cores of the cable (not shown), FIG. 4 (B), the at the same manner (C), and Box 1
No. 0 is installed in the wire inlet 21. The rubber sleeve 101 shown in FIG. 5 can be applied to a cable having a wire diameter in the range of φ10.5 to φ16.0.

Here, the rubber sleeve of the present invention can be used not only for the box as described above but also for a wire inlet of electric equipment such as industrial robots and industrial machines.

[0037]

As described above, according to the rubber sleeve of the present invention, the sleeve body having one or a plurality of electric wire insertion holes and having a tapered outer peripheral surface is provided with a hakama Since the seal member is formed integrally, the seal is formed by folding the seal member, and the double seal effect of the seal by the close contact between the outer peripheral surface of the sleeve main body and the inner peripheral surface of the electric wire lead-in port provides water and dust. -It is possible to reliably prevent oil from entering. In addition, after the sleeve main body is fitted into the wire inlet, the seal member is folded back, so that it can be easily attached to a box or the like.

[Brief description of the drawings]

FIG. 1 is a front view (A) and a central longitudinal sectional view (B) of an embodiment of a rubber sleeve of the present invention.

FIG. 2 is a front view (A) and a plan view (B) showing an example of a box to which the rubber sleeve of the present invention is applied.

3 is a front view (A) and a plan view (B) of a box main body constituting the box of FIG. 2;

FIG. 4 is an explanatory diagram of a mounting procedure of the rubber sleeve shown in FIG.

FIG. 5 is a front view (A) and a central longitudinal sectional view (B) of another embodiment of the rubber sleeve of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Rubber sleeve 2, 102 Sleeve main body 3, 103 Electric wire insertion hole 3a, 103a Partition wall 4, 104 Sealing member 10 Box 20 Box main body 21 Electric wire inlet 21a Through hole 21b Boss 21c Locking convex part 30 Upper lid W Electric wire

Claims (2)

[Claims] A rubber sleeve used for an electric wire lead-in port of a box or the like, the outer peripheral surface of which is formed into a conical taper shape, and a single or a plurality of electric wire insertion holes are formed, and a sleeve main body. A rubber sleeve, characterized in that it is a skirt-shaped member formed continuously with an end portion on the large diameter side of the above, and further comprising a seal member that can be folded back toward the small diameter side of the sleeve main body. 2. The rubber sleeve according to claim 1, wherein a partition wall which can be pierced by an electric wire or a tool is formed in the electric wire insertion hole of the sleeve main body.