How does a cellphone slide out keyboard work?

[Dangerousidiot]

Not the electronic part, but the mech that allows it to spring out and back in with just a push in that direction?

 

[Fortman]

Most of them literally just "slide" back and forth. The technology is pretty simple. If you're talking about the ones that literally spring out and whatnot, stop. They break AAAALLLLLL the time.