have a question about a relay/switch

I have been trying to find an answer about a relay. i have a very basic switch, basically power comes in and when the switch is grounded and held there it completes the circuit and power goes to the object(momentary switch). i am looking to find a relay that would turn it on when you hit the switch once and then turn it off when you hit it again. I think i want an impulse relay but im not too sure and no matter where i go no one seems to be able to help me out. I would appreciate any help or just a point in the right direction.

This is for a tattoo machine foot pedal. the power supply ratings are:
Input: AC 110V 50HZ-60HZ
Output: DC 1.5-15V 5A

Thank you