SECRET HEAD OF A MECHANICAL CLOSING DEVICE

摘要

The invention relates to closing devices, and more specifically to locking devices serving to close doors of living quarters, offices, safes and deposit boxes, and can also be used in closing devices for domestic and industrial establishments. According to the invention, in the proposed secret head of a mechanical closing device comprising a body, within a cylindrical cavity in which a central rotatable cylinder is mounted, the cavity in the body additionally contains the following, arranged concentrically: a hollow cylinder which is immovable relative to the body and is connected rigidly thereto and surrounds a central cylinder, and a second rotatable cylinder enclosing the immovable cylinder, wherein the kinematic connection between the rotatable cylinders is realized via a lever fixed to the end face of the central cylinder and via supports on the end face of the second rotatable cylinder, which supports are offset from the neutral position of the lever by an angle ±ß, which is selected from the condition ß > a, where a is selected from the condition sin a/2 = d/D, where d is the diameter of a pin opening, and D is the diameter of the central rotatable cylinder. The additional cylinders are intended for securing the key code, since, upon rotation of the central rotatable cylinder to an angle greater than a, said key code cannot be changed. Owing to such a construction, the proposed device is not susceptible to modern methods of non-destructive opening of pin locks, such as picking and bumping.