JPH05176495A - Terminal box for motor and motor equipped with terminal box - Google Patents

Abstract

PURPOSE:To prevent external wirings from being damaged and facilitate the connection of conduit tubes by a method wherein the terminal edge of a knock hole is curled inward so as to exceed the angle of 90 deg. and make a seat. CONSTITUTION:A curling (bending by 180 deg.) is applied along the inside of the configuration of a knock hole 6 for leading external wirings inwardly at the inside of a terminal box 3 to provide a seat so as to be capable of fixing a conduit tube through a lock nut upon connecting. Accordingly, the external wiring will never be contacted with the edge of the terminal end 6a of the knock hole 6. According to this method, the damage of the external wiring due to the terminal edge 6a of the knock hole can be prevented and the conduit tube can be connected easily.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] It can be generally used for electric motors equipped with a terminal box.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional terminal box structure. A bottom plate 1 is attached to a frame of an electric motor (not shown) together with a terminal box 3 by attaching screws 4. A terminal box cover 2 is attached to the bottom plate 1 with an attaching screw 7. 6 is a knock hole, and the terminal portion 6a is bent (squeezed) at a right angle inside the terminal box.
It has a burring structure. Further, FIG. 2 shows a structure in which burring is performed on the outside of the terminal box, and FIG. 3 shows a case of a round hole structure. In the conventional type FIGS. 1 to 3, the external wiring may be damaged at the edge of the terminal portion of the knock hole. In addition, it is difficult to connect conduits with the structures shown in FIGS.

[0003]

[Problems to be Solved by the Invention]

 ・ Prevents damage to external wiring. ・ Easily connects conduits.

[0004]

A terminal portion of a knock hole is curled inward at an angle of more than 90 degrees to provide a seating surface.

[0005]

Since the end portion of the knock hole is curled inward at an angle of more than 90 degrees and the seat surface is provided, the external wiring does not contact the edge of the end portion of the knock hole.

[0006]

EXAMPLE FIG. 4 shows an example, and the structure excluding the knock hole 6 is the same as the conventional type. FIG. 5 is a knock hole shape of the present invention, and curling (bending by 180 °) is applied to the inside of the terminal box. As shown in FIG.
The seating surface 6a 'is provided so that it can be fixed with. This terminal box is attached to the frame of the electric motor in the same manner as the terminal box that is generally used for power line connection in a general-purpose electric motor or the like.

According to this embodiment, the external wiring can be prevented from being damaged by the edge of the end portion of the knock hole, and the conduit connection can be facilitated.

[0008]

According to the present invention, the external wiring is not damaged. It also facilitates conduit connection.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional terminal box.

FIG. 2 is a knock hole shape of a conventional terminal box.

FIG. 3 is a knock hole shape of a conventional terminal box.

FIG. 4 is a cross-sectional view of the terminal box of the present invention.

FIG. 5 is a knock hole shape (enlarged view) of the terminal box of the present invention.

FIG. 6 is a diagram showing a conduit connection.

[Explanation of symbols]

1 ... Terminal box bottom plate, 2 ... Terminal box cover, 3 ... Terminal box,
4 ... Terminal box mounting screw, 5 ... Internal lead wire, 6 ... Knock hole, 6a ... Knock hole end, 6a '... Seat surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichiro Saito 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture Inside the Narashino Factory, Hitachi, Ltd. (72) Inventor Asumitsu Watanabe 7-1, Higashi Narashino, Narashino City, Chiba Prefecture Issue Hitachi Keiyo Engineering Co., Ltd. (72) Inventor Noriyuki Kumamoto 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Keiyo Engineering Co., Ltd.

Claims (2)

[Claims] 1. A terminal box for an electric motor, characterized in that a knock hole for drawing out an external wiring is provided with a bent seat surface inside the terminal box at an angle of more than 90 degrees. 2. A motor provided with a terminal box, wherein the terminal box has a shape of a knock hole for drawing out an external wiring and a bent seat surface is provided inside the terminal box at an angle of more than 90 degrees. An electric motor equipped with a terminal box.