Opposite of a momentary switch?

[DaninDorset]

Hi,

Looking for a bit of advice on the correct type of switch. I have a sprung vending machine coin return pull, the end of the rod (inside the machine) needs to operate a 12v on/off momentary type switch. So when the lever is in its normal position, then end is pushing the switch in & it's off, when it's pulled, the rod travels enough to release the switch & turn it on, when the lever is let go because its sprung the rod presses back on the switch, turning it off.

The ideal thing would a momentary switch (like a bell push) but the opposite way round so its off when its pressed in, on when its released.

Could I wire a micro switch to do something similar? I've seen latched switches, but from what I can work out, they don't return like a momentary switch?

Thanks in advance,

 

[timhoward]

A 3 contact micro switch has a normally closed contact that is opened when the switch is pressed.
Another possibility is a reed switch which is closed when a magnet is in close proximity to it. These are used for door contacts by intruder alarms. By adjusting the magnets position it could probably do what you want.

 

[Lucien Nunes]

As above, the term you are looking for is 'normally closed.' Still a momentary switch, but one that opens when pressed. Not as common in conventional pushbutton form, but widely available as microswitches, contact blocks for modular switches, etc. A changeover switch contains both normally-open and normally-closed contacts and is equally suitable.

 

[DaninDorset]

Thanks Tim,

I'll take a look.

 

[DaninDorset]

As above, the term you are looking for is 'normally closed.' Still a momentary switch, but one that opens when pressed. Not as common in conventional pushbutton form, but widely available as microswitches, contact blocks for modular switches, etc. A changeover switch contains both normally-open and normally-closed contacts and is equally suitable.

Thanks Lucien,

Aha, yes that was the term I need.

Thanks again,

 

[JordyStepho]

Yep agree 100%, these guys are on it.