JPS605718Y2 - Motor terminal box - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a terminal box for a motor.

Conventional terminal boxes are shown in FIG. 1 in the case of a cast iron motor frame, and in FIG. 2 in a vertical cross-sectional view orthogonal to the motor shaft in the case of a steel plate motor frame.

1 is the motor frame, and if it is a steel plate frame, it is the mounting base 2.
is welded to the motor frame 1, and in the case of a cast iron frame, a mounting seat 3 is provided integrally with the motor frame 1.

Tapped holes are arranged on the mounting base 2 and the mounting seat 3 at the corners of the square, and the terminal box body 4 abuts through the packing 5, and the terminal box main body 4 and the packing 5
The machine screws 7 are inserted into the tapped holes of the mounting base 2 and the mounting seat 3 by inserting them into the machine screw holes.

The lead wire 8 of the motor is taken out by passing through the bushing 9 fitted into the hole in the terminal box body 4, and the power supply cable is taken in through the cable lead-in hole 11 and the lead wire 8 is taken out.
It is designed to be combined with

12 is a cover of the terminal box body 4, and the cover 12 is attached to the terminal box body 4 with machine screws 13.

If you want to change the direction of the power supply cable in a motor equipped with such a terminal box, to change the direction of the terminal box body 4, unscrew the machine screws 13, remove the cover 12, and remove the machine screws 7 inside. Then, rotate the terminal box main body 4 so that the cable lead-in hole 11 is directed in the desired direction, bring it into contact with the mounting base 2 or the mounting seat 3 via the packing 5, and attach it with the machine screws 7.

Therefore, it takes a lot of effort to change the direction.

Further, since the bushing 9 is attached to the terminal box body 4, there is a drawback that the lead wire 8 may be twisted unless the work is done carefully.

This invention eliminates the above-mentioned drawbacks of conventional motor terminal boxes, and provides a motor terminal box in which the direction of the power supply cable lead-in hole can be changed with a single touch, and the lead wire does not get twisted when the terminal box is rotated. The purpose is to

This idea involves creating notches in the outer flange at the end of the mounting base of the motor terminal box body, dividing the circumference equally, and providing locking holes in the remaining outer flange portion, which is not cut out, at positions divided into equal circumferences. The terminal box body is provided with a protrusion that can be engaged with the outer flange of the mounting base on the outside from the outer diameter side of the outer flange and that fits into the locking hole of the flange. Fix the pieces,
The outer flange of the mounting base is held between the engagement piece and the terminal box body, and the gasket between the terminal box body and the mounting base is held so that the terminal box body can be rotated and locked, as well as the motor lead wire. This embodiment has a bushing inserted into a hole in a motor frame.

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

3 is a longitudinal sectional view perpendicular to the motor shaft, FIG. 4 is a sectional view taken along line AA in FIG. 3, and FIG. 5 is a side view showing the flange portion of the mounting base.

A cylindrical mounting base 2 is welded to the motor frame 1, and a terminal box body 4 is attached to the mounting base 2 via a packing 5.
The cover 12 covers the oblique opening of the terminal box body 4 in FIG. It is screwed into.

The lead wire 8 is inserted through a bushing 9 that fits into a hole in the motor frame 1, and the waist bushing 9 is clamped so that the lead wire 8 is prevented from moving by a cable clamp 10.

The circular outer flange of the mounting base 2 is provided with notches 15 that equally divide the circumference, and the outer flange is provided with steps 16 with the outer circumferential side brought closer to the motor frame 1 side, as shown in FIG. The step 16 is provided with slope devices 6S on both sides in the circumferential direction.

Locking holes 17 pass through the step 16 of the outer flange at equal intervals on the circumference.

The locking hole 17 has a crank shape in cross section as shown in FIG. 3 and a sector-shaped planar shape as shown in FIG. A protrusion 19 provided on a retaining piece 18 that holds the back surface of the outer flange is fitted.

The width of the retaining piece 18 is smaller than the width of the notch 15 in the outer flange of the mounting base 2, and it is designed to be pulled out between the notches 15 perpendicularly to the plate surface, and is arranged at four equal intervals around the circumference. engaged piece 18
is integrally fixed with the terminal box body 4 by welding or bolts not shown.

The step 16 of the outer flange of the mounting base 2 has a protrusion 19 connected to the locking hole 17.
This is the most preferred embodiment, in which the outer flange is given elasticity in order to smoothly move in and out, and the engagement between the outer flange and the retaining piece 18 is made smooth by a slope device 65. The holes 17 may be suitably formed to eliminate the step 16 so that the outer flange is flat.

When changing the direction of the power supply cable lead-in hole 11 of the terminal box configured in this way, rotate the terminal box body 4 without removing the cover 12, and the protrusion 1
9 climbs onto the step 16 of the outer flange through the locking hole 17 in which the outer flange and the engaging piece 18 are elastically deformed.

The protrusion 19 slides on the step 16 and slides down on the slope device 65.

When the gasket 5 is fixed to the terminal box body 4, the gasket 5 rotates together with the terminal box body 4.

Also, when the seal 5 is simply held between the terminal box body 4 and the mounting base 2, the seal 5 is annular, so whether it rotates or not, it has no effect on the outer flange's annular shape. It is always in contact with the flat part 2a of.

When the terminal box body 4 is rotated 45 degrees, the notch 15 on the outer flange of the mounting base and the engagement piece 18 will align and there will be a position where the terminal box body 4 will be removed from the mounting base 2. When the outer flange of the mounting base 2 and the retaining piece 18 are rotated further by 45 degrees without letting go, the protrusion 19 ascends the slope device 6S of the step 16, so that the inner flange portion of the terminal box body 4 The annular flat portion 2a of the outer flange of the mounting base 2 is pressed through the gasket 5, and the projection 19 is repelled by the outer flange and the retaining piece 18 and enters the locking hole 17, causing the terminal box body 4 to rotate. can be stopped.

Similarly, since the terminal box main body 4 is locked when rotated by 90 degrees, the direction of the power supply cable lead-in hole 11 can also be changed by 90 degrees.

The lead wire 8 is inserted through the bushing 9 that is fitted into the hole in the motor frame 1, and is only lightly secured with a cable clamp 10, so unless the power supply cable has already been connected, the lead wire 8 is There is no problem even if you turn it quickly because it will not be damaged.

As described above, in this invention, the terminal box body is fitted to the mounting base fixed to the motor frame so that it can rotate, so it is possible to change the direction of the cable entry hole with one touch without using tools and with less time consuming. I can do it.

Since the lead wire is locked at a hole in the motor frame and the lead wire is fastened with a light force, it will not be twisted and no stress will be caused to the lead wire.

In the embodiment, the retaining piece 18 is fan-shaped and welded to the terminal box body 4, but it may also be annular in cross section as shown in FIG. 3 and attached to the terminal box body 4 with machine screws or the like.

In this case, the flange notch 15 of the mounting base 2 will be removed, but
It would be better to have a step 16 and a slope device 65.

FIG. 6 is a longitudinal sectional view of another embodiment of this invention.

In this embodiment, the engaging piece 18 is connected to the terminal box body 4.
The inner flange portion 4a of the terminal box body 4 is separately welded to the terminal box body 4.

FIG. 7 is a drawing showing still another embodiment of this invention, in which the mounting base 2 is attached to the motor frame 1 with machine screws 20, and the inner flange 4a of the terminal box body 4 is attached to the flat part of the outer flange of the mounting base 2. 2a through the gasket 5, and fix the engaging piece 18 inside the terminal box body 4 so that the waist protrusion 19 is elastically pushed from the inside of the terminal box body 4 to the outside and thrust into the locking hole 17. This is what I did.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal sectional views of a conventional terminal box, Figure 3 is a longitudinal sectional view of an embodiment of this invention, and Figure 4 is a longitudinal sectional view of a conventional terminal box.
The figures are a sectional view taken along the line A-A in Fig. 3, Fig. 5 is a partial side view of the mounting base, Fig. 6 is a longitudinal sectional view of another embodiment of this invention, and Fig. 7 is a further embodiment of this invention. FIG. 3 is a longitudinal cross-sectional view of the embodiment. 1...Motor frame, 2...Mounting base, 2a...Annular plane part, 3...Mounting seat, 4...Terminal Box body, 5...
...Putskin, 8...Lead wire, 9...
...Bushing, 10...Cable clamp, 11...Cable entry hole, 12...
Cover 13...Machine screw, 15...Notch, 16...Step, 16S...Gradient,
17...Latching hole, 18...Engagement piece, 1
9...protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A mounting base attached to a motor frame surrounding a hole through which the motor lead wires are inserted, and a terminal box attached to the mounting base, where the mounting base is cylindrical and has a shape at the tip of the tube. It has an outer flange that extends to the outside of the cylinder, and the packing is attached to the terminal box side of the outer flange of the mounting base, around the hole in the terminal box body through which the lead wire passes, and away from the hole in the terminal box through which the lead wire passes. One end is fixed to the terminal box body in the position where the other end faces the hole through which the lead wire of the terminal box passes, and the middle part leaves a gap between the other end and the edge of the hole through which the lead wire of the terminal box passes. A motor terminal, which is equipped with an engaging piece arranged in the same manner as the connecting piece, and which is held between the engaging piece and the edge of the hole through which the lead wire of the terminal box passes, so that the terminal box can rotate together with the flange of the mounting base and the packing. box. 2. A plurality of notches are provided in the outer flange of the mounting base in the radial direction from the outer diameter side, and a retaining piece is shaped so that the notches can be passed through the terminal box in the direction in which the mounting base and the terminal box come into contact with each other. A terminal box for a motor according to claim 1 of the utility model registration claim provided in claim 1.