Electrical combination key lock

Claim 1

In an electric combination card lock for a system, an electrically actuated alarm and an electrically energized engine, a lock formed of insulating material and having a generally rectangular shape, said lock embodying a relatively thin card receiving pocket extending substantially all the way therethrough, a plurality of spaced contact elements embedded in the lock on opposite sides of said pocket and said contact elements coinciding with the surfaces of the pocket, insulators on the outer surfaces of said contact elements, electric circuits separately connecting at least one of said contact elements to an electrically actuated alarm circuit and at least one other of said contact elements to an electrically energized engine circuit, a relatively thin flat key card formed of insulating material insertable in the pocket of said lock, a plurality of selectively conductive and nonconductive balls rigidly mounted in said key card between opposite sides of the card with each ball extending from opposite faces of said card, said card with said conductive balls being adapted to electrically interconnect at least some of the contacts in the pocket of said lock to complete a circuit to said alarm, to said engine, or to both said alarm and said engine, and a hand control switch battery electrically connected in said circuits.