JPS6133607Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sliding variable resistor that prevents electrical failure from occurring even when foreign matter such as liquid flows into the elongated hole for lever operation.

Generally, in a sliding type variable resistor, an elongated hole is formed in one side of a box-shaped case, and a lever fixed to a sliding body provided inside the box-shaped case projects outward from the elongated hole. If there is an elongated hole used to operate such a lever, a child may insert a coin and the resistor may become inoperable, or drinks may flow through the elongated hole, causing an electrical problem. There is a possibility that this may occur. Conventionally, in order to prevent these accidents, various methods have been proposed for closing the elongated hole while the lever is still operable. Although these measures can prevent solid foreign objects such as coins from entering, it is extremely difficult to completely prevent liquid from entering.

The present invention solves the above-mentioned conventional problems, and provides a sliding variable resistor that does not cause electrical failure even when liquid such as a drink enters through the elongated hole. The purpose is to

In this invention, a gutter body is arranged inside the elongated hole of the box-shaped case, and the gutter body catches the liquid that enters from the elongated hole, and the liquid is drained to the outside through the drainage hole drilled in the end plate of the box-shaped case. It is characterized by being designed to be discharged.

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

FIG. 1 is a perspective view with a partial cross section showing a sliding variable resistor according to the present invention, and FIG. 2 is a cross-sectional view.

Reference numeral 1 in the figure is a box-shaped case. This box-shaped case 1 has a pair of case frames 1a and 1b facing each other,
In addition, an end plate 2 is interposed at both ends, and each case frame 1a, 1b is assembled by tightening the female screw hole 2a of the end plate 2 with a screw 3. An elongated hole 4 is formed in the upper surface matching portion of the case frames 1a and 1b. Furthermore, a gutter body 5 is provided inside the box-shaped case 4. This gutter body 5 is located directly below the elongated hole 4 and extends along the elongated hole 4.
The upper part 5a of the side plate of the gutter body 5 is expanded and formed to be larger than the width of the elongated hole 4. Further, the inner surface of the end plate 2 has a tenon or a groove.
On the other hand, a corresponding groove or tenon is formed in the end portion 5b of the gutter body 5, and by this combination,
Both ends of the gutter body 5 are supported by the inner surface of the end plate 2. A gutter body 5 is provided on at least one of the end plates 2.
A drain hole 2b communicating with the inside of the drain hole 2b is bored, and a drain pipe (not shown) can be connected to this drain hole 2b as needed. Further, insulating substrates 6a, 6 are provided on the inner surfaces of the case frames 1a, 1b.
b is attached, and resistors 7a, 7b and conductors 8a, 8b are mounted on the inner surface of each insulating substrate 6a, 6b.
8b is installed. The resistors 7a and 7b are each connected to a terminal 9 (shown only in FIG. 1), and the conductors 8a and 8b are connected to a terminal 10. Both terminals 9 and 10 are connected to the bottom of the box-shaped case 1. It stands out. On the other hand, a sliding body 11 formed of an insulating material is housed inside the box-shaped case 1. This sliding body 11 has a protrusion 11a formed on the lower surface that engages with a guide groove 1c at the bottom of the box-shaped case 1, and both upper side surfaces of the sliding body 11 abut against the upper guide surface 1d of the box-shaped case 1. It is guided by the guide groove 11a and the upper guide surface 1d, so that it can slide without any backlash. Sliding body 1
A lever 12 is fixed to the upper part of 1, and this lever 12 passes through the elongated hole 4 and projects to the outside. Further, the sliding body 11 has an escape hole 11b formed therein. The cross-sectional shape of this escape hole 11b is formed to be substantially similar to the cross-sectional shape of the gutter body 5. The gutter body 5 is inserted into and fixed in the escape hole 11b, and due to the existence of the escape hole 11b, the sliding body 11 is fixed in the box-shaped case 1 regardless of the existence of the gutter body 5.
It is designed to be able to slide inside. Sliders 13a and 13b are fixed on both sides of the slider 11, and as the slider 11 slides, the slider 13
a, 13b are in sliding contact with the resistors 7a, 7b and the conductors 8a, 8b.

Next, the operation and effects of the present invention based on the above configuration will be explained.

This sliding variable resistor is installed on an operation panel of an audio device, and is fixed to the panel surface by a female screw 1e formed on the top surface of the box-shaped case 1. The sliding variable resistor is operated by moving an operation button (not shown) fixed to the lever 12 that projects outside.

If a liquid such as a drink is accidentally dropped from above the sliding variable resistor, this liquid may enter the box-shaped case 1 through the elongated hole 4. However, since the gutter body 5 is located directly below the elongated hole 4, the liquid that has entered from the elongated hole 4 is received by the gutter body 5. Furthermore, this gutter body 5
The liquid that has fallen into the gutter body 5 flows through the gutter body 5 and is discharged to the outside from the drain hole 2b formed in the end plate 2. If a drain pipe is connected to the drain hole 2b, the liquid discharged from the drain hole 2b can be led to a safer place and drained. Further, even if powdery foreign matter other than liquid enters through the elongated hole 4, the gutter body 5 can catch it. Furthermore, if the gutter body 5 is installed in a position close to the elongated hole 4, even when a coin is inserted through the elongated hole 4, the lower end of the coin will be caught by the gutter body 5, and the coin will be transferred to the box-shaped case 1. This prevents it from entering inside.

In the illustrated embodiment, the cross-sectional shape of the gutter body 5 is such that the upper portion 5a has a wide corner folded shape, but the cross-section is not limited to this, and the cross-sectional shape may be semicircular or V-shaped. good.

As described above, according to the present invention, since the gutter body is provided inside the elongated hole of the box-shaped case, the gutter body absorbs foreign substances, especially liquids such as drinks, that accidentally enter through the elongated hole, and It can be drained to the outside through a drainage hole formed in the face plate. Therefore, the liquid does not come into contact with the resistor or the slider, and the occurrence of electrical failure can be effectively prevented. Further, since the sliding body has an escape hole through which the gutter body is inserted, the sliding operation of the sliding body is no different from that of the conventional one.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a perspective view including a partial cross section of the sliding variable resistor, and FIG. 2 is a cross-sectional view. 1... Box-shaped case, 2... End plate, 2b... Drain hole, 4... Long hole, 5... Gutter body, 7a, 7b...
Resistor, 8a, 8b...Conductor, 11...Sliding body, 12...Lever, 13a, 13b...Slider.

Claims (1)

[Scope of utility model registration request] A resistor and a conductor are mounted on the inner surface of the box-shaped case, and a sliding body equipped with a slider that slides on the resistor and the conductor is installed inside the box-shaped case. In a sliding type variable resistor, a long hole extending in the sliding direction of the sliding body is bored in the side surface, and a lever fixed to the sliding body projects from the long hole to the outside of the box-shaped case. A gutter body is installed inside the box-shaped case and extends in the same direction as the elongated hole, and both ends of the gutter body are brought into contact with end plates of the box-shaped case, A sliding variable resistor characterized in that the end plate is formed with a drainage hole communicating with the inside of the gutter body, and the sliding body is further formed with an escape hole through which the gutter body is inserted.