JPS6128342Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bushing, and particularly to a bushing used for fixing an electric wire inserted through a case opening at the opening.

BACKGROUND OF THE INVENTION Conventionally, bushings used in electrical equipment are known, for example, in the form shown in FIG. This type of bushing 1 has a hole 1a along the axial direction.
The bushing 1 is fitted into the opening 2a of the electrical equipment case 2, and an electric wire 3, such as a vinyl cord, is inserted into the hole 1a of the bushing 1. The electric wire 3 is fixed in the opening 2a. This may cause disconnection of the electric wire 3 near the opening 2a, or the opening 2 due to tension.
Prevent from falling off from a.

However, in this type of bushing 1, the inner surface of the hole 1a is made flat in order to facilitate the work of inserting the electric wire 3 into the hole 1a. However, it had the disadvantage of being easy to fall off.

This invention was devised in view of the above-mentioned shortcomings of the conventional technology, and the purpose of this invention is to provide a bushing that facilitates the work of installing electric wires, and that also firmly fixes the electric wires to the case opening after installation. shall be.

To achieve this objective, the present invention includes a cylindrical soft outer member that is fitted into the case opening, and a hard inner member that has a locking groove along the axial direction, After the electric wire is clamped in the locking groove, the inner member is fitted into the outer member to clamp the electric wire in the case opening.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

FIG. 2 is an exploded perspective view of a bushing 11 according to a first embodiment of the invention, and FIG. 3 is a vertical cross-sectional view of an outer member. It consists of 13.

The outer member 12 has a cylindrical shape, and the through hole 12a inside thereof has an inner member insertion hole 12a ₂ at the rear and a wire insertion hole 12a ₃ smaller than the hole 12a ₂ at the front, with the step portion 12a ₁ as a boundary. are set up in succession. On the other hand, the outside of this outer member 12 has a rear end 12
A fitting groove 12c is formed along the peripheral edge near b, and a tapered portion 12e is formed toward the tip 12d.
is formed. This outer member 12 is made of a soft material, for example, a soft resin such as soft vinyl chloride.

The inner member 13 has a hole 12a ₂ in the outer member 12.
A locking groove 13a is formed along the axial direction of the column, and the inner surface of the locking groove 13a has an uneven shape, for example, a wavy shape as shown in FIG. This inner member 13 is made of a hard material, such as hard resin or aluminum.

FIG. 4 is a longitudinal sectional view showing the state in which the bushing 11 is attached. To install the bushing 11, first insert the electric wire 2 into the through hole 12a of the outer member 12.
3. For example, by penetrating an insulated wire, this outer member 1
2 is inserted into the locking groove 13a of the inner member 13, and then the inner member 13
is inserted into the hole _12a2 of the outer member 12 and brought into contact with the stepped portion _12a1 . After that, if the outer member 12 is press-fitted from the inside to the outside of the opening 22a of the case 22, for example, an electrical equipment case, from the tip 12d, the outer member 12 will be inserted into the tapered part 1.
2e into the opening 22a, the fitting groove 12c is fitted into the opening 22a, and the installation is easily completed. Thus, the electric wire 23 is held in the wavy locking groove 13a of the hard inner member 13, and since the inner member 13 is fitted into the hole _12a2 of the soft outer member 12 under pressure, The electric wire 23 itself is fixed to the case opening 22a by the bushing 11. That is, in the longitudinal direction of the electric wire 23, the inner member 13, which clamps the electric wire 23 in the locking groove 13a, engages with the stepped portion _12a1 of the outer member 12, while In this direction, the pressing force of the outer member 11 is applied through the locking groove 13a, and the outer member 11 is firmly fixed to the case opening 22a. Therefore, even if a tensile force is applied to the electric wire 23 in the outer direction A of the case 22, the inner member 12 is locked by the stepped portion _12a1 of the outer member 12, and the electric wire 23 does not come off from the bushing 11. 23
Even if a pushing force is applied to the inside direction B of the case 22,
Due to the pressing force of the outer member 12, the bushing does not easily come off, and has a greater retaining effect against pulling force and pushing force than conventional bushings. In addition,
The bushing according to this invention can also be used for fixing wire members other than electric wires.

FIG. 5 is a perspective view showing the inner member of the bushing 11 according to the second embodiment of the invention. This inner member 33 divides a rigid cylindrical member into two parts, connects both members 33a and 33b along the axial direction so as to be freely openable and closable, and furthermore, both members 33a and 3
A locking groove 33a ₁ , 33b ₁ , for example, a wavy locking groove is formed in each of the grooves 3b. Both members 33a and 33b of this inner member 33 are connected, for example, by a hinge.

In this inner member 33, both members 33a, 33b
After opening and inserting the electric wire 23 into one of the locking grooves _33a1 , both members 33a and 33b are closed and the electric wire 23 is inserted into one of the locking grooves 33a1.
and then the outer member 11 of the first embodiment
into the hole _12a2 , and connect the electric wire 2 in the same way as in the previous embodiment.
Hold 3. Inner member 33 according to this embodiment
Since it can be opened and closed freely, the work of attaching the electric wire 23 is simplified.

FIG. 6 is a longitudinal sectional view of a bushing according to a third embodiment of the invention. This bushing 41 is
This embodiment is composed of an outer member 42 and an inner member 43, which have substantially the same shape as the first embodiment, except that an inner protrusion 42f is provided at the rear end of the outer member 42. In the bushing 41 according to this embodiment, the inner member 43 fitted into the outer member 42 is held in the axial direction by the stepped portion 42a ₁ of the outer member 42 and the inner protrusion 42f, so as to prevent the electric wire from coming off against the pushing force. It's getting bigger.

FIG. 7 is a longitudinal sectional view of a bushing according to a fourth embodiment of this invention. This bushing 51 is
It is composed of an outer member 52 and an inner member 53, which have substantially the same shape as the first embodiment, but an annular groove 52f is provided along the inner peripheral surface of the hole _52a2 of the outer member 52, and This embodiment differs from the first embodiment in that an annular projection 53f that fits into the groove 52f is provided on the outer peripheral surface of the inner member 53.

In the bushing 51 according to this embodiment, the inner member 53 fitted into the outer member 52 is
a groove 52f that fits into the step _52a1 and the protrusion 53f;
This clamps the wire in the axial direction, increasing the effect of preventing the wire from coming off against the pulling force and pushing force.

FIG. 8 is a longitudinal sectional view of a bushing according to a fifth embodiment of this invention. This bushing 61 is
It is composed of an outer member 62 and an inner member 63, which have almost the same shape as the first embodiment, except that a reinforcing member 64 is fitted into the rear part of the hole _62a2 of the outer member 62. , which is different from the first embodiment.

That is, the reinforcing member 64 has an annular shape with a through hole, and the reinforcing member 64 is fitted into the rear part of the hole _62a2 of the outer member 62, and the reinforcing member 64 and the stepped portion provided in the hole of the outer member 62 are connected to each other. _62a1 , the inner member 63 is clamped in its axial direction, thereby increasing the effect of preventing the electric wire from coming off against the pushing force.

Since the bushing according to this invention is constructed as described above, when installing the electric wire, all that is required is to clamp the electric wire in the locking groove of the inner member and then insert the inner member into the outer member, which simplifies the installation work. Not only is the wire fixed in the opening of the case, but it is held in the locking groove of the hard inner member, and this inner member is pressurized inward by the soft outer member, so the wire itself is It is clamped and fixed in the longitudinal direction by bushings, which has the effect of preventing the wire from coming out due to pulling out or pushing. In particular, if the locking groove is made wavy, the effect of preventing the electric wire from coming off is remarkable, and by making the inner member openable and closable, the work of attaching the electric wire is further simplified.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing the installed state of a conventional bushing, Fig. 2 is an exploded perspective view of the bushing according to the first embodiment of this invention, and Fig. 3 is a longitudinal cross-sectional view of the outer member in Fig. 2. , FIG. 4 is a vertical cross-sectional view showing the installed state of the bushing in FIG. 2, FIG. 5 is a perspective view showing the inner member of the bushing according to the second embodiment, and FIG. Longitudinal sectional view, No. 7
The figure is a longitudinal sectional view of the bushing according to the fourth embodiment, and FIG. 8 is a longitudinal sectional view of the bushing according to the fifth embodiment. 11, 41, 51, 61... Butssing, 1
2, 42, 52, 62...outer member, 13, 3
3, 43, 53, 63...inner member, 13a, 1
3a ₁ , 33b ₁ ... Locking groove, 22 ... Case, 22
a... Case opening, 23... Electric wire.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical soft outer member that is fitted into the case opening, a hard inner member that has a locking groove along the axial direction and is fitted into the outer member. A bushing comprising: a locking groove of an inner member that is fitted into the outer member, and an electric wire is held between the locking grooves of the inner member. 2 Utility Model Registration The bushing according to claim 1, wherein the inner member is formed in a cylindrical shape, and a wavy locking groove is bored along the axial direction of the inner member. 3 Utility Model Registration Scope of Claim 1 In the bushing described in claim 1, in the inner member, the cylindrical member is divided into two parts along the axial direction so as to be freely openable and closable, and a wavy locking groove is formed on each opposing surface. Butsuthing that will be done.