METHOD OF SELECTING RADIAL HOLE COORDINATES Russian patent published in 1998 - IPC

FIELD: methods of selection of radial hole coordinates for cylinder mechanism of lock combination. SUBSTANCE: lock consists of body, turning bushing with which central core is rigidly connected and tubular key is inserted into round slot located between turning bushing and central core. The method allows increase of lock combinations, and consists in selection of coordinates and filling with two groups of spring-loaded members of holes with code by selected coordinates. The first group pf spring-loaded members ensures locking of turning bushing with any inserted key made with some other code. The second group ensures locking of turning bushing with key withdrawn. In each group, one member is supporting and contacts with central core. With key inserted, coming in contact with central core are supporting members of the first group only. Located coaxially on drawings of body, turning bushing and tubular key are coordinates of possible holes which cannot be all together made without crossing of their surfaces in key. Holes are made with coordinates selected from coordinates of possible holes with consideration of limitation excluding possibility of crossing of surfaces of selected holes. In this case, minimal distance between coordinates of possible holes is determined proceeding from the condition which ensures impossible touching of central core by supporting members from the first group of sets with any inserted key in which holes are made by some other code. Gaps between these supporting members and central core in this event shall be such that turning bushing remains locked. EFFECT: higher efficiency. 3 dwg