That is a DPST switch. When the button is up, nothing is connected to anything. When the button is down, 1 is connected to 2 and 3 is connected fo 4.
If you are using a typical SPST switch, that is not the right symbol. The common ones are SPST and have 1 and 3 connected together internally, and same for 2 and 4. When pushed, all four pins are connected together.
Bob