Button self-locking switch shape - self-locking button switch state - self-locking switch function - button switch graphic - straight key switch surface - push switch appearance - tact switch difference
Key switch - self-locking switch - tact switch difference
Touch can change the state of the switch contact, so the contact capacity is very small, and the structure is simple, the switch power can only be maintained after the power is removed, that is, it can be pressed with a small force, without Locked single-contact button switch. At present, the membrane switch and the small micro-switch can be regarded as tact switches. Most of the structures are printed on two mutually insulated films, and the lines are connected to each other by pressing; or made of thin elastic metal. The butterfly-shaped shrapnel is connected to the printed circuit by pressing the shrapnel.
The switch is divided into a knob type, a plate type (including a button switch, a boat switch) and a button type in terms of operation modes; wherein the knob type and the plate type switch can mostly be held (locked) in an on or off state after the operation. For example, the daily use of light switches, fan speed switches, such switches do not have to emphasize whether or not with self-locking, because there are obvious "operation direction"; only button-type switches, are used when pressed,
Most push button switches are used to turn the circuit on or off when pressed, and the state is restored after release, so it is sometimes called "bell switch", and the push button switch can maintain the "already pressed" state, and the ordinary switch In the same way, the self-locking device is added, and the self-locking performance is utilized, so that it can also be kept on or off by itself, which is a self-locking switch, wherein, for some need, several switches are allowed only when working. One is in the connected state, and the rest must be disconnected, there are several button switches combined side by side, and the "interlock mechanism" is used.
Only one of the switches is allowed to be in the connection lock state, and when the other switch is pressed, the switch is locked, but at the same time the original locked switch is released (such as the "play, fast forward, rewind" mechanical button on the tape recorder). For these switches, the contacts may be one or more sets; there are also a plurality of locking mechanisms, wherein a plurality of spring hooks are used to slide along a heart-shaped groove, and the two tips of the heart-shaped groove correspond to the locking and releasing positions of the switch.
Reset after power failure, that is, the locking mechanism should work in the power supply, and the finished product does not seem to be, because the requirement can be achieved by using a circuit composed of a general push button switch and a relay; but if only one relay (or contactor) is used, The group normally open contact is used to control the working coil power of the relay (contactor), and the relay balance iron is used as a switch button. After the balance iron is pressed, the contact of the relay control coil is closed, the coil is energized, and the relay remains closed ( Self-locking), the other contacts control other lines; when the power is cut off, the relay will be powered off, the iron will be reset, and the button will be reset. You need to press the relay iron again to turn the power on again. This relay is now a button switch with a live lock. The switch on the rice cooker and the electric kettle is locked after being pressed, but after heating to the specified condition, the magnet or the bimetal of the lock switch state acts to reset the switch and cut off the power supply (the rice cooker is switched to the heat preservation state) Maybe not
Reset after power off" request.
Self-locking switch system and tact switch system The self-locking switch “self-locking†means that the switch can maintain a certain state (on or off) through the locking mechanism. “Light touch†means no need to connect with much strength. 
Button self-locking switch shape - self-locking button switch state - self-locking switch action - button switch graphic - straight key switch surface - push switch appearance