Micro switch with forced separation mechanism

Abstract

The invention discloses a micro switch with a forced separation mechanism. The micro switch comprises a normally closed static contact piece, a button and an elastic component and further comprises aforced separation piece, wherein one end of the forced separation piece is installed on a shell through a rotary shaft, the other end thereof props against the end surface of the elastic component, and the button and the forced separation piece are linked so as to force the normally closed static contact piece to separate from the elastic component. The micro switch is provided with the forced separation piece, so that when a movable contact and a static contact cannot separate from each other normally, the movable contact and the static contact are forced to separate so as to keep the electric appliance safe. The micro switch has a bright application prospect.

Description

technical field [0001] The invention relates to a micro switch, in particular to a micro switch with a forced separation mechanism. Background technique [0002] The micro switch is a contact mechanism with a small contact interval and a quick-action mechanism, which performs switching actions with a specified stroke and a specified force. It is covered with a casing and has a trigger rod on the outside. Small, hence the name micro switch. The external mechanical force acts on the action reed through the transmission element (press pin, button, lever, roller, etc.). Tap to quickly connect or disconnect. When the force on the transmission element is removed, the action reed produces a reverse action force, and when the reverse stroke of the transmission element reaches the action critical point of the reed, the reverse action is completed instantaneously. The contact spacing of the micro switch is small, the action stroke is short, the pressing force is small, and the on-o...

AI Technical Summary

Problems solved by technology

[0006] 2. Most of the micro switches are self-resetting by tension springs, reeds or integral shrapnel. In the initial state, the contacts on the movable contact piece of the switch are usually in contact with the contacts on the normally closed connector. The rocker movement mode is used to realize the forced separation of the switch. When the contact on the movable contact piece contacts the contact on the normally closed connector at the top, one end of the forced separation part moves downward around the fulcrum when the button is pressed down, and the other end of the forced separation part moves The direction is upward, and the forced separation can only be forced to separate when it acts on the moving contact piece downwards. Therefore, the movement direction of the other end of the forced separation is upward and does not work, which also makes it difficult for the micro switch to realize the forced separation function.

[0007] 3. The internal elastic parts of the micro switch mostly use tension springs, reeds or integral shrapnel to trigger the switch to turn on and off. The switching action and reset are all completed by elastic parts. The elasticity of elastic parts is generally relatively small. The forced separation part cannot be reset by itself, and it needs to be reset by the elastic force of the switch shrapnel, but the elastic force of the elastic part of the micro switch is generally too small, and additional force is required to force the separation part to reset, which increases the burden on the elastic part and easily affects the switching characteristics. , when the elastic force of the switch is attenuated, severe cases can lead to the failure of the switch action. If the switch is installed in a vibrating environment, it is easy to cause problems if the vibration of the separating part is forced

[0008] 4. When the micro switch adopts reed or integral shrapnel, because the wall thickness of the moving contact piece is thin and elastic, when the forced separation part acts on the elastic moving contact piece, because the action stroke of the micro switch is relatively short, the moving The elastic deformation of the contact piece offsets the function of the forced separation part, which will cause the forced separation part to not work. To solve this problem, the total stroke of the switch needs to be increased, but the limited space of the micro switch does not allow any further increase of the stroke, otherwise the switch will become non-standard. Switch, even if it is allowed to increase the total stroke of the switch, because most of the micro switches are reset by reeds or integral shrapnel, an increase in the total stroke will cause the moving contact piece to fail to reset or fall out of the groove, resulting in the switch not being able to operate

Even if the moving contact piece does not fall off, because the gap between the dynamic and static contacts of the micro switch is relatively small, when the switch is forced to separate and acts on the elastic moving contact piece with a large stroke, it is easy to cause permanent deformation of the moving contact piece. Once the moving contact piece is permanently deformed It will lead to a change in shape, which in turn will lead to a change in the position of the fulcrum of the moving contact piece, resulting in a change in the parameters of the switch action, which will seriously cause the switch to fail to operate or reset

[0009] The above problems lead to the fact that the same type or similar micro switches with forced separation function are basically not seen in the market, which belongs to the bottleneck of the micro switch industry. The switch does not have the forced separation function. It cannot be separated normally during the pressing process, which sometimes brings serious safety hazards. Because the existing micro switch cannot realize forced separation, it cannot be applied in fields with safety requirements, especially in some industries with industry safety standards, such as the elevator industry, etc. , leading to strict restrictions on switch applications, restricting the development of the industry

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