I am look for a vendor that sells a push-down linear actuator which is spring loaded to restore its original position. This has nothing to do with an electrical push-button. I'd appreciate any help, thanks!
You will find lots of spring loaded devices on the internet but you left out a lot of information, like length of travel, force involved, and many other factors. Do you want to move 3 lbs or 3 tons? Do you want to travel 1/2 inch or 200 feet?
How much force are you able to exert on your push-button, and how much force must your actuator deliver? If you need a lot of actuator force, you either need a fancy action of some sort, or you need a relay and solenoid.