latching with a timed relay

Question

I am an ultra newbie, so please excuse my design/drawing here and I am sure my terms are not correct, but I want to learn. Here is what I am trying to do and a diagram. I think I got it right, but would love some advice.

Object: To turn on a light and have it turn off automatically after a period of time by a time delay relay.

Ground: Power Source Negative (green) to negative on relay. Lights Negative to negative on relay.

Power: Power Source Positive (red) to positive on relay through a button. Jumper from positive on relay to common on relay.

Button: Momentary Push Button making the initial connection.

Lights: Positive on lights (red) connected to first terminal on time delay relay. After an amount of time, this terminal is switched off and it defaults to turning on terminal 2 which will not be used.

Latching: Both connectors on momentary push button (blue) latched to terminal 1. This is to create a by-pass creating a latched connection to allow the lights to remain on even though the momentary push button is released breaking the initial connection.

Relay Reset: Once terminal 1 is turned off, it will sever the latched connection, thus removing all power from the relay resetting it.

My Biggest Questions is, "is the latching going to work when I release the momentary push button and will it shut off power to the relay once connection 1 is terminated once the time has expired??

Answer 1

I don't know if this helps, but if you are looking to turn on the lights for a few seconds to a few minutes, you could use the button to trigger a 555 timer circuit that drives the relay. This one will turn on the lights for about a second. Increase R4 or C2 to increase the delay; there's a chart in the data sheet that you can use to figure out the right values to use. R2 will depend on your relay.

^{simulate this circuit – Schematic created using CircuitLab}

Answer 2

This is @Willis Blackburn's schematic, but edited so the circuit will work.

R1 was added to provide DC restoration for C1, which was added in order to make sure that no matter how long SW1 was made, U1 would time out.

D1 was added to clamp the spike generated by SW1 opening tom V1+, (3 to 18 volts for a 555)

D2 was added to clamp the negative spike generated by RLY1's coil when U1's output goes low, therefore keeping the magic smoke from getting out, and

$$ \tau = R_T\Omega \text{ } C_T F $$

is the timing for a 555 one-shot, where \$ \tau \$ is the timeout in seconds, Rt is he timing resistor in ohms, and Ct is the timing capacitor in Farads.

Megohms and microfarads also works...