TODAY’S PATENT – CYLINDER LOCK
The CYLINDER LOCK was invented by Arne Baltscheffsky (Kauniainen), Alpo Karkkainen (Kulbo) on the 29th of June 1982 , bearing patent number US4336700A.
The invention relates to a cylinder lock comprising a fixed cylinder housing and therein a turn able cylinder having a plurality of locking discs which are movable by the key of the lock and which in their zone position, that is, the key insertion position, prevents the cylinder from turning relatively to the cylinder housing, but which by the key can be moved or turned into a position releasing the cylinder.
The invention is based on the conception that a spring load could be useful also in locks where the zero setting of the locking elements is positively guided. In such a lock it is no requirement that the spring load should act on all the locking elements, neither is it required that the spring load should perform a complete zero setting, because the functional zero setting is positively guided. It is completely sufficient to have a spring load which urges the locking discs away from that position in which they release the locking mechanism, that is, the cylinder