KEY-LOCK COMBINATION

Abstract: A key-lock combination is designed to permit a large number of different keys by providing the key (1) with numerous, preferably hemispherical bosses by forging or casting. A key combination is achieved by removing some of the bosses. In the lock plug (2) longer tumblers (5) are put in corresponding positions. Shorter tumblers (4) contact the remaining bosses. An outer sleeve (7) keeps the tumblers (4, 5, 6) and the springs (8) within the lock cylinder (3). In the figure there is shown a correct key combination at position A and an incorrect key combination at position B.

Description: Key-lock combination My invention, a key-lock combination, can be used as a lock for cars, doors, boxes, mechanical equipment and se¬ veral other objects. The lock is entirely mechanical. My lock, the key of which has a cylindrical shank measuring 6 mm in diameter and 30 mm in length, has 30 tumblers. Each tumbler has two positions. The tumblers either contacts the even surface of the key or the upper part of a hemispherical boss. Hence it follows that there are 2 30 possible combinations, in other words over one thousand million possibilities. The lock key (part 1) is made by casting or forging, t shank being provided with hemispherical or conical bosses. The lock plug (part 2) consists of a tube, manufacture from a profiled material, whose inner surface is provided with grooves corresponding to the key shank shape. The plug has drilled holes for the tumblers. Preferably the holes are arranged at different distances on the plug, in order to make the assembling of the lock easier and to reduce the force necessary for inserting the key. The lock cylinder (part 3) consists of a metallic or plastic tube, provided with drilled holes for the tumblers and the springs. The outer sleeve (part 7) keeps the tumblers and the springs within the lock. The sleeve is atLached to the cylinder by screws or pins. The tumblers consist of cylindrical plungers (part 4 an 5) provided with conical or rounded end parts. The tumbler spring force should be found out by the manufacturer by experimentation, in order to avoid a solution that will result in unnecessary wear on the key surface or in an unsatisfactory locking effet. A lock manufactured with the correct dimensions and tolerances will give a good protection against tampering, provided that a sufficiently large number of tumblers is used. I preferred a hemispherical boss, because this is easier to remove by the manufacturer or the locksmith. Tampering is prevented by the fact, that it is diffi¬ cult to replace a removed boss. Requested specification of my patent application. My invention is common to many other locks in that the tumblers are responding to the heights of the bitting (bosses) and in this way allows or prevents the lock plug to rotate in relation to the lock cylinder. The difference consists of the fact that the key is provided with bosses which are removed in a preferred combination. These bosses are manufactured by forging or casting. Since the key and (he lock is a unity there are several essential dependent claims assigned. The object of these is to support the main claim in order to prevent infringement on the unity by various applied combinations.

Claims: CLAIMS : I want to protect by patents the lock and the key invented by me, the key being provided with bosses shaped as hemispheres or the like, and the lock adapted to this key. I also want to protect by patents all keys shaped as cylinders, provided with bosses, and locks adapted to these keys, regardless of the differences that are caused by a different dimensioning of the parts. I also want to protect by patents locks and keys according to my main claim, may the key shape be poly¬ gonal, round, semiround or prismatic. I also want to protect by patents all locks and keys mentioned above, may they be provided with bevels, cuts, notches or bosses. I also want to protect by patents the manufacturing of the key bosses by stamping, with at least the die provided with hemispherical impressions. I also want to protect by patents the positioning of the bosses at different distances from the key shank end. I also want to protect by patents the manufacturing of the lock cylinder from a profiled material.

Inventors: LIUKKONEN SEPPO TOIMI TAISTO, LIUKKONEN, SEPPO, TOIMI, TAISTO
Applicants: LIUKKONEN SEPPO TOIMI TAISTO, LIUKKONEN, SEPPO, TOIMI, TAISTO
Application year: 1984
Main classification: E05B27
IPC codes: E05B19, E05B27