Electric timing circuitry with means to compensate for switch chatter

Claim 1

An electric timing circuitry connectable to a source of electric energy during use and of the type having a switching circuit switchable to one state after the closing of a normally open source switch to effect current flow through a load and switchable to another state to terminate current flow through said load, and a timing circuit including a series connection of a resistor and capacitor having a junction point connected to said switching circuit and operable in response to the opening of a normally closed starting switch to initiate the running of a predetermined time period and effect switching of said switching circuit from said one state to said another state after the elapse of said predetermined time period: means for compensating for switch chatter of said source switch comprising means connecting said source switch and starting switch in a series circuit and connecting said series circuit in parallel with said capacitor so that said capacitor performs the dual function of a chatter-compensating capacitor for said source switch and a timing capacitor for said timing circuit.