JPS6187590A - Switch structure for washing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an opening/closing switch having a dowel for external operation, and particularly to a switch structure that operates with a low load even when agitating due to sliding on a slope.

[Background of the invention]

In the microcomputer fully self-cleaning lid switch, the switch is turned ON and OFF by rotating the tab 7A in the horizontal direction and moving the control button 14 upward.
The conventional technology does not take into consideration the increase in frictional resistance between the claw 7A and the dowel 14 due to the adhesion of dirt and dust due to use.

Note that related switches of this type include, for example, Japanese Patent Application Laid-Open No. 50-71169.

[Purpose of the invention]

The present invention has a structure in which the turbo 14 is moved up and down to open and close the contact when the claw portion 7A having a slope is moved horizontally, so that the horizontal load on the claw portion 7 is minimized to reduce the necessary contact load. The purpose is to provide a switch that is activated by a dowel.

[Outline of invention cost]

When moving an operating dowel with a bearing up and down by the horizontal load of a slope, the distance from the load point to the first fulcrum 21 and the distance to the second fulcrum are required to reduce the horizontal load. t
We have calculatedly discovered that reducing the ratio L1/12 to 2 is the best method from a structural and cost standpoint.

[Practical side of the invention]

An embodiment of the present invention will be described below.

A safety switch/lid switch (hereinafter referred to as SF switch) 3 is attached to the bottom of the top cover 10 at the top of the washing machine using screws, etc., and a timer 1 is attached to the terminal of the switch 8.
The lead wire coming out from 1 is connected. This SF switch 3
A dowel 14 for opening and closing the contact pieces 13a and 13b is inserted into the case 15 of the switch 9 so as to be able to move up and down, and is operated by the claw 7A of the safety lever 7 to open and close the contacts.

Next, when the washing machine is in use, the lid 2 is closed, and the tip of the lid lever 4 is lifted by the lid 2, resulting in the state shown in FIG. 2. At this time, the safety lever 7 is also raised by the lid lever 4, and the dowel 14 of the switch 8 is turned ON by the claw 7A. In this state, dewatering begins, and the outer tub 1 collides with the safety lever 7 due to unbalance caused by the cloth being lopsided, etc., causing the safety lever 7 to
Push in direction P. The safety lever 7 rotates about the contact part with the cut-and-raised part 5 of the lid lever 4 as a fulcrum while bending the spring 6. In this state, which temporarily becomes the state shown in FIG. 3, the dowel 14 of the switch 8 is safe. The claw 7A of the lever 7 comes off the slope, and the switch 8 turns OFF, but immediately the spring 6
The safety lever 7 rotates in the Q direction due to the load, and the claw part 7A
Lift the dowel 14 upwards on the slope of the switch 8.
Turn on. The time from ON to OFF is determined by a microcomputer, and if it exceeds 180 m5, the lid is opened and all operations are stopped. If it is below 1.80 m s, it is determined that the SF switch 3 is operating due to imbalance, and water is turned on. , perform a return cycle to stir and eliminate imbalance. At this time, the load Ps below the dowel 14 is normally applied when the contact piece thickness is 0.5 wx (because of the connection method using an IJ receptacle), the contact piece length is 30 m or less, and the width is 4 threads or more (due to contact temperature rise, the contact diameter is φ3 or more). )
Therefore, P8>0, 12 Kp, and the rotational force Wo necessary to push up the dowel is Wo sinθ−Po −(P+ +ttl (W+
+W2)) (CoSθ10μ.sinθ)・・・・・・
...(1) 71°: Friction coefficient μI between claw 7A and dowel 14: Friction coefficient between case 15 and dowel 14 (2), (3) Substituting 2 into equation (1) results in P B = 0.12 Kg θ=48° ttl=
If 0.21 μQ = 0.21 t, /lz = 1/4, then Wo = 0.188 ky, and 0.188
The dowel can be operated smoothly if it is rotated with a force of Kg or more. Furthermore, even when the friction coefficient μo between the dowel 14 and the claw 7A becomes 1 due to foreign matter and dust, Wo = 0.52.
Kp, and stable operation can be obtained even with the A-shippane load (load that allows the switch to be turned ON due to the weight of lid 2) of 0.56 kg, which is used regularly.The direction to lower the rotational load of claw 7A is 1, the coefficient of friction. μ0. Lower μl.

2. Increase the angle θ of the claw 7A.

3. Lower the load Ps on the contact piece.

There are methods such as, but it is difficult for the first term to be less than 0.2 for plastics,
Unable to deal with the long-term increase in frictional resistance.

Item 2 is technically difficult because the SF switch of washing machines that are not controlled by a microcomputer is not compatible, making the switch large and requiring a long rotation distance for the safety lever, making it an expensive switch.

As mentioned above, item 3 is difficult to reduce due to performance problems as a contact piece, and the method according to the present invention solves all of the above drawbacks.

In addition, in FIG. 6, the first fulcrum part of the dowel 14 is a separate piece of guide 18, and this kite 18 is attached to the case 15a.
After the case 15 is inserted into the base 12 and the case 15 is attached to the base 12, it is stuck between the case 15 and the base 2, so that it cannot be removed.

In the method in which the first fulcrum part is integrally provided with the projection part 19 from the case 15, the switch is completely turned to 0FFL when the imbalance shown in FIG. Since the contact portion is provided with a wrap allowance t to ensure operation, there is a drawback that each case 15 must be manufactured separately.This drawback cannot be overcome by the method of providing the guide 18 as a separate piece as described above. , the case 15 can be shared, and the switch 8 itself can also be shared, which has the effect of improving productivity.

〔Effect of the invention〕

According to the present invention, in a switch such as a washing machine with limited space, operating force, etc., the distance tl from the load point of the dowel 14 to the first fulcrum and the distance t2 from the second fulcrum
By reducing the ratio of 11/l2 to 1/3 or less, the rotational force Wo can be reduced by 55% compared to the conventional t1/12-1 without increasing the price. This provides a highly reliable switch that can cope with increased frictional resistance between the dowel 14 and the claw 7A.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the washing machine showing the installation state of the SF switch 3, Fig. 2 is a side view of the 8F switch 3 of the present invention, and Fig. 3 is a diagram of the operating state of the SF switch 3 of the present invention.
4 is a detailed view of the ■ part of the SF switch 3 of the present invention, FIG. 5 is a detailed view of the ■ part of the conventional SF switch 3, FIG. 6 is an exploded view of the switch part of another embodiment of the present invention, and FIG. The figure is a conventional science fiction
Another example of switch 3. 14...Dowel, 15...Case, 7A...Claw portion. Chest 1 Figure ¥2 Figure 14 Figure ¥5 Figure

Claims (1)

[Claims] 1. In a switch having a structure in which the dowel 14 that opens and closes the contact is supported by the case 15 and the slope of the claw 7A slides to open and close the contact, the load due to the claw 7A of the dowel 14 is reduced. A switch structure characterized in that the ratio l_1/l_2 of the distance l_1 from the point to the first fulcrum of the bearing part of the case 15 to the distance l_2 to the second fulcrum is 1/3 or less. 2. The structure of the switch according to claim 1, characterized in that the first fulcrum is formed by a separate piece.