SECRECY BLOCK FOR FOUR-TURN SLIDE-TYPE LOCKS Russian patent published in 2007 - IPC E05B25/02 

FIELD: ironmongery, particularly mortise or rim slide-type locks adapted to lock objects with high-strength doors.

SUBSTANCE: secrecy block includes bolt sides with depressions to cooperate with key bits and with slot for locking post receiving, as well as a set of semi-slides arranged in-between and supported by guiding posts. The semi-slides may move under the action of key and are spring-loaded by compression springs. The semi-slides have surfaces provided with slots for compression spring and guiding posts receiving. Block also has locking window with projections to cooperate with locking post, code combination to provide cooperation of half of semi-slides associated with key bits and notching to prevent another semi-slides half cooperation with the first one. Slots for compression spring receiving are identical with each other and have centers located in diagonal line of each semi-slide. Centers of guiding post receiving slots lie in another diagonal line. Locking window is made in transversal axis of semi-slide between different slot pairs. Locking extensions adapted to cooperate with locking post are created in one half of locking window passing into slot for locking post receiving at another window half. Code combination to cooperate with key bits is created in peripheral semi-slide edge under locking projections of locking window. Notching is created on opposite peripheral edge thereof and extends along diagonal line over locking post receiving slot. Said notching prevents contact of corresponding semi-slides with key bits from opposite secrecy block side, wherein each next semi-slide of the set is laid on previous one by the same side and turned through 180° in plane thereof.

EFFECT: improved secrecy, extended functional capabilities, simplified structure and decreased costs.

4 dwg