Mech mod switch how does it works?

[cashew]

HI all,


I'm having difficulty visualizing how does this particular mech switch works http://fasttechcdn.com/products/142/1429800/1429800-7.jpg

For those types with insulator, the battery is secured between the top pin and the insulator with no current flow i.e open circuit
When the switch is pressed. The firing pin rises to close the circuit and current flows.

For the one in the picture, it appears that the battery is gonna be secured between the top pin and the firing pin which means that the circuit is closed.

Obviously I have the wrong understanding somewhere since this design works. If someone could explain my mistake, it'll be great

 

[twgbonehead]

The shrink-wrap on the battery extends around the outside edge of the bottom of the battery. See:
https://www.fasttech.com/products/0...-us18650vtc3-18650-1600mah-3-7v-rechargeable# (The 3rd picture)

The battery rests on the outer ring of the firing-pin piece, insulated by the wrapper. The center contact is a bit lower and so does not make contact.

When the button is pressed, the center pin is pushed up against the bottom center of the battery (which is NOT covered with shrink-wrap)

 

[Rule62]

IMO, this is a terrible and dangerous design. The switch relies on the battery wrap as the only insulator on the shoulder of the switch.

 

[twgbonehead]

IMO, this is a terrible and dangerous design. The switch relies on the battery wrap as the only insulator on the shoulder of the switch.

Yep, I agree, particularly since the wrapper can easily tear while you're tightening the bottom cap.

 

[cashew]

thanks for explaning.
I could machine an insulator ring to push the battery away from the pin, maybe that might work

 

[Nytebreed]

I'd have to tear down that switch to tell for sure, but what it looks like to me, is that the negative post pictured there is static and not really the switch contact. There is probably an additional post contact underneath that moves with the switch to complete the circuit.

 

[TheJakeBailey]

Looks like an OG Chi you top cap and switch to me. If it is, there is a white delrin piece on the switch that the battery sits on. I can't tell for sure if it's there because the picture you refferenced is so bright in that area. But I'm 99% sure that is the case.