MAGNETIC CYLINDRICAL COMBINATION MECHANISM FOR TUBE-KEY LOCK Russian patent published in 1999 - IPC

FIELD: locks. SUBSTANCE: device has housing and rotation bush which is rigidly connected to central rod which is engaged with lock bolt. Housing and rotation bush are equipped with coaxial radial holes some of which are coaxial cone holes in key. Each hole which is coaxial to a key hole contains ball, which diameter is greater than wall width of rotation bush, and clipper which is located between ball and external surface of housing. Other holes contains two identical balls, which diameter is less than wall width of rotation bush. Central rod carries permanent magnets which are shaped as cylinders. They are mounted on rod so that their faces coincide with adjacent planes in which radial holes are located. EFFECT: decreased size, decreased force for rotation of rotation bush. 3 cl, 3 dwg