Burglarproof device for vehicle

Claim 1

A burglarproof ignition device for a vehicle comprising: a key cylinder lock for the vehicle including an outer tubular member and an inner tubular member rotatably provided within said outer tubular member, a plurality of axially aligned radially extending holes in said outer tubular member, a plurality of axially aligned grooves in said inner tubular member aligned radially with said plurality of axially aligned radially extending holes in said outer tubular member, a properly coded magnet key adapted to be inserted into said inner tubular member, with a magnet positioned thereon to align with at least some of said grooves in said inner tubular member, a spring loaded magnet pin positioned in each of said plurality of axially aligned radially extending holes in said outer tubular member which correspond radially to a magnet positioned on said key, each of said spring loaded magnet pins extend into each of said grooves in said inner tubular member which correspond to the magnets on said key and which are biased toward said inner tubular member, a switch member provided in each of said radially extending holes in said outer tubular member which include a spring loaded magnet pin, each switch member is closed in response to insertion of said properly coded magnet key into said inner tubular member and opened in response to removal of said properly coded magnet key, an information receive discrimination circuit for carrying out a receive discrimination with respect to presence and absence of power supply signals respectively delivered via each said switch member by a power delivered from a battery as a power supply mounted in said vehicle, an information collative judgment circuit adapted to receive an information signal from said information receive discrimination circuit to make a comparative collation between storage information provided by making reference to a specific code memory circuit in which specific codes corresponding to combinations of open and closed states of each said switch member are stored in advance, and said information signal, and a central processing until are operative to deliver output signals to supply elements essential for the operation of an engine for the vehicle only when it receives, from said information collative judgment circuit, a correspondence signal indicating that said storage information and said information signal are in correspondence with each other.