JPH0741078Y2 - Mounting device for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mounting device for an electric device, and particularly to a mounting hole for penetrating an electric device having a base and a cover such as a circuit breaker together with the base and the cover. The present invention relates to an improvement of a mounting device for an electric device that is mounted on a mounting plate or the like with a mounting screw passed through.

[Prior Art] Conventionally, an electric device such as a circuit breaker has a large diameter portion and a small diameter portion in the height direction of the electric device.
A mounting device in which a concentric penetrating mounting hole having a stepped structure is provided, and a mounting screw such as a slotted machine screw is inserted into the mounting hole and screwed to a mounting plate has been mainly used.

[Problems to be Solved by the Invention] Although the conventional mounting device has the above-described configuration, the mounting posture of the electric device (circuit breaker) is often so-called vertical mounting in which the mounting holes are horizontal. For this reason, when the electric device is slightly inclined when mounting or removing the electric device, the mounting screw inserted into the mounting hole may drop off, resulting in poor workability.

The present invention has been made in view of the problems of the conventional device as described above, and even if the electric device is slightly tilted at the time of mounting, the screw inserted into the mounting hole does not drop out, and the mounting device has good workability. The main purpose is to provide.

[Means for Solving the Problems] An attachment device for an electric device according to the present invention includes a base formed of an insulator of the electric device and a cover formed of the insulator, and penetrates the cover and the base. The mounting hole has a multi-stage structure, and the mounting hole has a large diameter hole through which the mounting screw head on the cover can be inserted, and a small diameter slightly larger than the screw diameter of the mounting screw on the base. The hole portion and the enlarged diameter hole portion having a diameter larger than the diameter of the large diameter hole portion provided between the large diameter hole portion and the small diameter hole portion.

[Operation] According to the present invention, since the mounting hole that penetrates the cover and the base has the enlarged diameter hole portion having the largest diameter in the center, when the threaded portion of the mounting screw is passed through the small diameter hole portion, the mounting screw head Is located in the enlarged diameter hole, and when the electric device is tilted slightly, the step between the enlarged diameter hole and the large diameter hole acts as a protrusion that locks the mounting screw head, and the mounting screw It will be locked here and will not fall out of the electrical equipment.

[Embodiment] Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment.

As shown in FIGS. 1 to 3, an electric device is provided with a cover (1) made of an insulating material and a base (2) made of an insulating material, and the cover (1) and the base (2) are combined to generate electricity. It shall constitute the housing of the equipment. The mounting device is such that the electric device (11) (Fig. 3) is mounted on the mounting plate (10) (Fig. 3), etc. over the mounting screw (3), the cover (1) of the electric device (11) and the base (2). According to the present invention, the mounting hole comprises a large-diameter hole portion (4) penetrating the cover (1) and a small-diameter hole portion provided on the side opposite to the cover joining surface of the base (2). (5) and an enlarged diameter hole portion (6) provided on the cover joint surface side of the base (2), that is, in the middle of the large diameter hole portion (4) of the cover and the small diameter hole portion (5) of the base.
Large diameter hole (4), small diameter hole (5) and enlarged diameter hole (6)
Are formed substantially concentrically, and the large-diameter hole (4) has a diameter slightly larger than the diameter of the head (3a) of the mounting screw (3) and the washer (9) attached to or integrated with the head. However, the small diameter hole (5) has a diameter slightly larger than the diameter of the screw portion (3b) of the mounting screw (3), and the enlarged diameter hole (6) has a diameter larger than that of the large diameter hole (4). To form. In addition, (7) is a mounting screw head housing hole portion provided between the small diameter hole portion (5) and the enlarged diameter hole portion (6) of the base, and (6a) is an enlarged diameter hole portion and a head accommodation hole portion ( 7)
An inclined surface (8) between and is a convex portion (step portion) formed at the boundary between the enlarged diameter hole portion (6) and the large diameter hole portion (4).

Next, the operation of the mounting device will be described. The electric device (11) is assembled by joining the cover (1) to the base (2) and fixing them with screws or the like. When the electric device is assembled in this way, as shown in FIG. 2, the large diameter hole portion (4) provided in the cover (1) and the enlarged diameter hole portion (6) and the small diameter hole provided in the base (2). The part (5) and the like are concentrically continuous to form a single mounting hole. Electrical equipment that has been assembled in this way (11)
When attaching the to the mounting plate (10), insert the mounting screw (3) through the large diameter hole (4) of the cover (1), and then attach the mounting screw (3).
Insert the screw part (3b) of the
As shown in FIG. 3, b) is projected from the bottom surface of the base (2) and screwed into the screw hole of the mounting plate (10). At this time, the slope (6a) has the head (3a) of the mounting screw (3) and the washer (9),
Helps to smoothly drop into the storage hole (7). In the process of mounting in this manner, for example, in the case of mounting at a high place, the electric device may be tilted before mounting as shown in FIG. In such an inclined state, the mounting screw (3) tries to come out toward the cover side by its own weight, but in the mounting device of the present invention, the mounting hole has a large diameter hole portion (4) and an enlarged diameter hole portion (6). Since it has a convex portion (step portion) (8) formed by and, this locks the head portion (3a) of the mounting screw (3), or the head portion (3a) and the washer (9) are integrally formed. In the case of the washer-incorporated screw (sems screw) that has been installed, it serves as a locking portion that locks the washer (9) as shown in the lower part of FIG. .

Although the enlarged diameter hole portion (6) is provided in the base (2) in the embodiment of FIGS. 1 to 3, the enlarged diameter hole portion (6) is provided in the cover (1) as shown in FIG. It may be provided following the large diameter hole (4).

Further, in the above embodiment, the mounting hole has been described as a four-step structure having a screw head housing hole, but a three-step having a small diameter hole (5), an enlarged diameter hole (6) and a large diameter hole (4). It may be a structure.

[Advantage of Invention] As described above, according to this invention, the mounting hole penetrating the cover and the base is formed so that the convex portion is formed at the boundary between the large diameter hole portion and the enlarged diameter hole portion. , Prevents the mounting screw from falling off and has an excellent workability effect. Moreover, since the enlarged diameter hole is formed in the joint surface between the base and the cover,
For example, in molds for molding covers and bases,
There is an effect that the enlarged diameter hole portion can be easily formed by removing the core.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an electric device provided with an embodiment of a device for mounting an electric device according to the present invention, FIG. 2 is a sectional view of an essential part of the embodiment shown in FIG. 1, and FIG. FIG. 4 is a side view showing a mounting state of an electric device having the mounting device shown in FIG. 4, and FIG. 4 is a sectional view similar to FIG. 2 showing another embodiment of the mounting device of the electric device according to the present invention. In the figure, (1) is a cover of an electric device, (2) is a base of the electric device, (3) is a mounting screw, (3a) is a mounting screw head, (4) is a large diameter hole, and (5) is The small diameter hole portion, (6) is an enlarged diameter hole portion, and (8) is a convex portion. In each figure, the same reference numerals indicate the same or corresponding parts.

Front page continued (72) Fumiyuki Kusune, 1-8 Midoricho, Fukuyama City, Hiroshima Prefecture, Fukuyama Factory, Mitsubishi Electric Co., Ltd. (72) Kiyomi Yamamoto 1-8, Midorimachi, Fukuyama City, Hiroshima Prefecture, Fukuyama Factory, Mitsubishi Electric Corporation (56) References Actually open Sho 58-9521 (JP, U) Actually open 55-162845 (JP, U) Japanese Patent Sho 51-39078 (JP, B2)

Claims (4)

[Scope of utility model registration request] 1. A mounting plate, comprising: a base formed of an insulating material; and a cover formed of an insulating material, which is joined to the base, and a mounting screw is inserted into a mounting hole penetrating the cover and the base. In a mounting device for an electric device to be mounted, the mounting hole is provided in the cover and has a large diameter hole through which the mounting screw can be inserted; A small-diameter hole portion having a slightly larger diameter, and an enlarged-diameter hole portion provided between the large-diameter hole portion and the small-diameter hole portion and having a larger diameter than the large-diameter hole portion, and the large-diameter hole portion A mounting device for an electric device, wherein a convex portion for preventing the mounting screw from falling off is formed by the enlarged diameter hole portion. 2. A mounting device for an electric device according to claim 1, wherein the convex portion for preventing the mounting screw from falling off locks the head of the mounting screw or a washer integrally formed with the head. 3. The mounting device for an electric device according to claim 1, wherein the enlarged diameter hole portion of the mounting hole is formed on the base. 4. A mounting device for an electric device according to claim 1, wherein an enlarged diameter hole portion of the mounting hole is formed in the cover.