JPH0366772B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotary switch used for electrically opening and closing electrical appliances such as room air conditioners, refrigerators, dehumidifiers, etc., and particularly relates to a moderation mechanism in which an insulating plate is removed. .

[Prior art]

A conventional rotary switch will be explained with reference to FIGS. 1 to 4. Reference numeral 1 denotes a switch body made of an insulating material such as synthetic resin, which houses parts to be described later.
Reference numeral 2 denotes a cam, which is integrally formed by vertically stacking a switch operation cam part 2a and a positioning cam part 2b. The switch operation cam part 2a has cam surfaces 2a ₁ , 2a ₂ , 2 for operating four movable terminals to be described later.
a ₃ and 2a ₄ , and the positioning cam portion 2b has a curved tip and a star shape. Reference numeral 3 denotes a rotating shaft that passes through the center of the cam 2 and is fixed to the cam 2. The rotating shaft 3 is connected to the hole 1a of the main body 1 and the lid 1 which will be described later.
It is inserted into the hole 12a of No. 2 and is rotatable. 4 to 7 are movable terminals, contacts 4a, 5a, 6
a, 7a, and some protrusions 4b, 5b, 6b,
7b. These movable terminals 4 to 7 are housed in the main body 1 so that their protrusions 4b, 5b, 6b, and 7b operate on the cam surfaces 2a ₁ , 2a ₂ , 2a ₃ , and 2a ₄ of the cam 2, respectively. ing. 8 is a fixed terminal, and the contacts 4a, 5a of the movable terminals 4 to 7,
Contact 8a (partially not shown) opposite 6a and 7a
have. Reference numeral 9 denotes an insulating plate, which has a hole 9a slightly larger than the positioning cam part 2b of the cam 2, and is brought into contact with the upper surface of the switch operation cam part 2a. 10 is a rectangle-shaped movable piece whose upper and lower width dimensions are approximately the same as the upper and lower inner diameters of the main body 1;
The left and right width dimensions are set smaller than the left and right inner diameters of the main body 1. Therefore, the square-shaped movable piece 10 is arranged to slide left and right. Two recesses 10a are formed above and below the left end surface of the square-shaped movable piece 10, and a circular arc-shaped projection 10b is integrally formed on the left inner surface. 11 is a coil spring, and the recess 1
0a so as to constantly press the movable piece 10 to the right. Also, at this time, the circular arc-shaped protrusion 1
0b comes into contact with the positioning cam 2b. 12 is a lid that closes the upper opening of the main body 1.

In the rotary switch having such a configuration, when the rotating shaft 3 is rotated, the cam 2 is also rotated, and the ridge _2b1 of the positioning cam portion 2b is also moved in the rotational direction. As this mountain _2b1 moves, the square-shaped movable piece 10
slides to the left while compressing the coil spring 11. In the position shown in FIG. 2, the coil spring 11 is in its maximum compression state. When the ridge 2b ₁ passes the apex of the arc-shaped protrusion 10b, a force is applied to the arc-shaped protrusion 10b to move to the right side due to the elastic force of the coil spring 11, and the ridge 2b ₁ and the circle Solitary protrusion 1
A sliding force acts between the curved surfaces of 0b, causing the positioning cam 2b to rotate. At the position shown in FIG. 3 at the end of rotation, the coil spring 11 is in a minimum compression state.

Also, during this time, the protrusions 4b and 5 of the movable terminals 4 to 7 are
b, 6b, and 7b are designed to make a predetermined contact and separation from the cam surfaces 2a ₁ , 2a ₂ , 2a ₃ , and 2a ₄ of the switch operation cam portion 2a.

In the rotary switch having the above structure and operation, the coil spring 11 has one end 11a in contact with the inner wall 1b of the main body 1, and the other end 11b in contact with the bottom surface 10b of the recess 10a of the rectangle-shaped movable piece 10. is held in

Let us now consider the case where the insulating plate 9 is removed from this rotary switch for the purpose of cost reduction. When a large impact is applied to the rotary switch during transportation, the coil spring 11
is the inner wall 1b of the main body 1 or the recess 10 of the movable piece 10
a and falls onto the movable terminals 4 to ₇ . This fall not only causes loss of moderation function but also causes problems such as short circuits.

Further, due to the increased number of operations, the coil spring 11 may be subjected to stress and breakage. Needless to say, the damaged coil spring 11 sometimes falls onto the movable terminals 4 to 7, causing the same problem as described above.
In the worst case, there were serious drawbacks ranging from short circuits to overheating and ignition.

Therefore, it is almost impossible to remove the insulating plate 9 from the rotary switch, which has the drawback of increasing the number of parts and assembly man-hours, leading to higher costs.

[Purpose of the invention]

An object of the present invention is to simply and inexpensively provide a rotary switch in which the insulating plate is removed without changing the basic structure of the conventional rotary switch.

[Summary of the invention]

That is, a thin wall portion is provided on one surface below the concave portion of the square-shaped movable piece, and a coil spring receiving portion is provided below the main body corresponding to this thin wall portion, and the coil spring receiving portion and the thin wall portion are arranged so as to be wrapped. The shortcomings have been removed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 5 and 6. Items with the same symbols as conventional ones indicate the same items. The difference from the conventional one is the recess 1 of the square-shaped movable piece 10.
A thin wall portion 10b is provided below the thin wall portion 10b, and a coil spring receiving portion 1c is provided below the main body 1 corresponding to the thin wall portion 10b, and the coil spring receiving portion 1
c and the thin wall portion 10b are arranged so as to overlap each other within the entire sliding range of the rectangle-shaped movable piece 10.

Therefore, the effect of the wrap portion A prevents the coil spring 11 from falling onto the movable terminals 4 to 7 even if a large impact is applied during transportation. Also,
Even if the coil spring 11 is broken, the broken coil spring 11 does not fall onto the movable terminals 4 to 7.

According to this embodiment, it is possible to obtain a highly reliable rotary switch that does not require an insulating plate, is free from short-circuit overheating, and is easy to assemble and is inexpensive.

〔Effect of the invention〕

According to the present invention, the insulating plate can be removed by the action and effect of the coil spring receiver 1c and the wrap portion A of the thin wall portion 10b, so reliability is high, and
This has the effect of making it possible to provide an inexpensive rotary switch that is smaller and lighter.

Moreover, since it can be easily obtained without changing the basic structure of the conventional rotary switch, its practical effects are great.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of a conventional rotary switch; Figures 2 and 3 are plan views explaining the operation with the lid removed after assembly in Figure 1; and Figure 4 is an insulating plate from Figure 1. FIG. 5 is an exploded perspective view of the rotary switch of the present invention, and FIG. 6 is an explanatory diagram of the main parts surrounding the coil spring in FIG. 5. 1...Main body, 2...Cam, 3...Rotation axis, 4~
7...Movable terminal, 8...Fixed terminal, 9...Insulating plate, 10...R-shaped movable piece, 11...Coil spring, 12...Lid, 1c...Coil spring holder, 10
b... Thin part, A... Wrap part.

Claims (1)

[Claims] 1. A cam 2 having a switch operation cam part 2a and a positioning cam part 2b is rotatably mounted via a rotating shaft 3, movable terminals 4 to 7 are arranged corresponding to the switch operation cam part 2a, and the movable terminals 4-7
The fixed terminal 8 is arranged corresponding to the square-shaped movable piece 10, and the square-shaped movable piece 10 is arranged so as to be movable left and right inside the main body 1. A rotary switch is provided in which a coil spring 11 is elastically loaded in a compressed state, a circular arc-shaped protrusion 10b is provided on the left inner surface of the square-shaped movable piece 10, and this circular circular protrusion 10b is brought into contact with the positioning cam part 2b. In this case, the recess 10 of the square-shaped movable piece 10
A thin wall portion 10b is provided on the lower surface of the main body 1, and a coil spring receiving portion 1c is provided below the main body 1 corresponding to the thin wall portion 10b, and the thin wall portion 10b and the coil spring receiving portion 1c are arranged so as to overlap with each other. Features rotary switch.