JPH1186661A - Insulating cover of switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent short circuits between terminals of a switch over a long period by integrally forming a bulkhead for partitioning the terminals to each other, close to the terminal planted surface of the switch. SOLUTION: A square pole-like insulating cover 2, consisting of an insulating material such as plastics, is put on a switch body 1a. The insulating cover 2 covers a terminal 1c protruding from the terminal planted surface 1d of a switch 1 and is closely fitted to the terminal planted surface 1d to integrally form a bulkhead 3 for partitioning the terminals 1c, 1c to each other. The bulkhead 3 is extended in a terminal protruding direction, the part closely fitted to the terminal planted surface 1d is formed of two legs 4, 4, and a space 5 is provided between the legs 4, 4. On the lower end of the bulkhead, collars 6, 6 are horizontally protruded from the bulkhead 3 so as to be close to the terminals 1c, 1c. Thus, approaching of metal powder into the terminal planted surface can be prevented, and the creeping distance can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch insulating cover attached to a switch for preventing a short circuit between the terminals of the switch.

[0002]

2. Description of the Related Art In a power tool, in particular, a disc grinder inevitably sucks metal powder from a motor cooling opening in order to grind metal such as iron. Powder could accumulate and short-circuit between the terminals. Therefore, conventionally, as shown in FIG. 3, a rectangular tubular insulating cover 2 is attached to the switch 1 to cover the terminals 1c, 1c so that metal powder sucked from the motor cooling opening does not directly hit the terminals. Was.

[0003]

In this case, the accumulation of metal powder can be prevented for a certain period of time. However, the metal powder that has entered the insulating cover due to convection in the power tool housing accumulates on the terminals over time, and eventually short-circuits. May occur.

Accordingly, an object of the present invention is to provide an insulating cover for a switch that can prevent a short circuit between terminals of the switch for a long period of time.

[0005]

In order to achieve the above-mentioned object, the present invention relates to a method for mounting an insulating cover on a switch, wherein the insulating cover is integrally formed with a partition wall for partitioning terminals between the terminals and the terminals. It is a feature. In addition, a portion of the partition wall that is in close contact with the terminal planting surface may be a plurality of legs having a space therebetween. In addition, a flange protruding near the terminal may be provided at a lower end of the partition.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows, for example, a state in which a switch 1 is mounted on a housing 7 of a disc grinder. The switch 1 includes a switch body 1a, a switch lever 1b for operation, and switch terminals 1c, 1c. The switch body 1a of the switch 1 is covered with a rectangular tubular insulating cover 2 (see FIG. 2) made of an insulating material such as plastic, and the insulating cover 2 protrudes from the terminal planting surface 1d of the switch 1. The partition walls 3 that cover the terminals 1c and 1c and that are in close contact with the terminal planting surface 1d and that partition between the terminals 1c and 1c are integrally formed. The partition wall 3 extends in the terminal protruding direction, and a portion that is in close contact with the terminal planting surface 1d is composed of two legs 4 and 4, and a space 5 is provided between the legs 4 and 4. Further, flanges 6 and 6 protrude vertically from the partition 3 at the lower end of the partition 3 and above the legs 4 and 4 so as to approach the terminals 1c and 1c. Reference numeral 8 denotes an opening for sucking motor cooling air by a motor cooling fan (not shown) provided in the housing 7 of the disc grinder.

The insulating cover 2 of the switch constructed as described above protects the metal powder sucked together with the cooling air from the opening 8 of the housing 7 from directly hitting the terminals 1c, 1c. The partition wall 3 that separates the terminals by closely adhering to the terminal planting surface 1d of the switch 1 against the deposited metal powder also prevents short-circuiting from the terminal planting surface and increases the creepage distance. The risk of short-circuiting between terminals 1c, 1c beyond 3 is also reduced. Also, if the portion of the partition wall 3 that is in close contact with the terminal planting surface 1d is a plurality of legs 4 and 4 having a space 5 in the middle, the metal powder that has entered between the legs and the terminal planting surface once enters the space. It is difficult to short-circuit between terminals because of accumulation. Further, terminals 1c, 1
c, the gap between the terminal and the flange is narrow, preventing the intrusion of metal powder into the terminal planting surface and further increasing the creepage distance.

[0008]

As described above, according to the present invention, a short circuit between the terminals can be prevented for a long period of time because the partition wall separating the terminals is formed on the insulating cover of the switch. Further, since a plurality of legs having spaces in the middle are provided in the partition wall, prevention of short circuit from the terminal installation surface can be enhanced. In addition, by protruding the flange close to the terminal from the partition, it is possible to prevent metal powder from entering the terminal installation surface and increase the creepage distance.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a mounted state of a switch.

FIG. 2 is a perspective view of an insulating cover.

FIG. 3 is a front view of a conventional switch covered with an insulating cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Switch 1c, 1c ... Terminal 1d ... Terminal installation surface 2 ... Insulating cover 3 ... Partition wall 4, 4 ... Leg 5 ... Space 6 ... Flange

Claims (3)

[Claims] An insulating cover for a cylindrical switch made of an insulating material covered on a switch so as to cover a terminal protruding from a terminal planting surface of the switch. An insulating cover for a switch, wherein a partition partitioning the space is integrally formed. 2. The insulating cover for a switch according to claim 1, wherein a portion of the partition wall that is in close contact with the terminal planting surface includes a plurality of legs having a space therebetween. 3. The insulating cover for a switch according to claim 1, wherein a lower end of the partition has a flange protruding near the terminal.