Seat belt buckle having a built-in microswitch

Claim 1

A seat belt buckle for vehicles comprising: a buckle body 1 being housed by the front and rear outer covers 2, 2', a vacillating lever assembly having a support arm 20 on the one side and a push lever 21 on the other side is provided on the lower part of said buckle body 1 by means of a pintle 19, wherein said vacillating lever assembly is fitted with torsion coil spring 22 which pushes up said support arm 20 against the lower part of a key plate 4, a latch plate 5 having a latch hook 17 formed on the front upper part thereof and a pair of eared upper ends on both sides thereof, wherein said eared upper side-ends are each movably received through respective side apertures 16, 16' of said buckle body 1 to be guided therein, and said latch plate 5 is pushed forwards (left-wards in FIG. 4) from behind by a plate spring 18, a pair of guide bars 6, 6' formed in parallel at a proper interval on the front wall of said buckle body 1, wherein both guide bars 6, 6' are each fitted with respective coil springs 8, 8' on the tops of which a pair of push plates 7, 7' are each slidably mounted on said respective guide bars 6, 6', said push plates 7, 7' being integrally formed, a fixing cord 14 rigidly connected to said lower end plate 1' of said buckle body 1, wherein the other end of said fixing cord 14 is fixed to the vehicle bottom plate on the right or left side of the driver's seat, and a microswitch 9 having a switch lever 11 and a switch button 10 which is provided on the lower end plate 1' of said buckle body 1, wherein the lever end 11' of said microswitch 9 is connected to the lower end of said coil spring 8', and said lever end 11' will activate said switch button 10 when said fastening ring 13 of the seat belt 15 is inserted into the belt buckle, between said latch plate 5 and the front wall of said buckle body 1, whereby the forehead of said fastening ring 13 pushes down on said push plates 7, 7' together with said coil springs 8, 8', thereby activating said lever end 11' and at the same time said switch button 10, characterized in that said microswitch 9 is electrically interconnected with the ignition switch as well as the starter motor.