Abstract: A key blank comprises a shaft and a head connected to the shaft, the shaft including first and second surface that are oppositely facing, wherein the surfaces are configured to include combination elements to operate a lock and a pair of coaxial operating elements, wherein one element of the pair is operative from the first surface of the shaft and the other element of the pair is operative from the second surface of the shaft, and wherein at least one of the operative elements is a resilient element mounted inside a bore provided in the shaft, wherein the resilient element is operative to exert a compressive force on a pin mechanism of the lock in response to the operative engagement and thereby release the pin mechanism from a lock position, without requiring any pressure on the coaxial element on the other side.

Abstract: A lock mechanism for locking a door or the like with a Sabbath control unit comprises a Sabbath control unit comprising an optical device including a light beam emitter and detector spaced apart with a line of sight path between them, the optical device operative to provide output indicating if a light beam emitted by the emitter is received by the detector, and a locking mechanism comprising a moving member operative to be displaced between a locked state position wherein the door is locked and an unlocked state position wherein the door is unlocked, wherein the moving member is operative to block the line of sight path while in the locked state position and to clear the line of site path while in the unlocked state position, and wherein the Sabbath control unit is operative to activate an electronic device in response to output indicating that the light beam emitted by the emitter has not been received by the detector.

Abstract: A substantially burglary-proof lock, comprises a housing formed with a cylindrical bore defining an inner cylindrical surface, and a cylinder within said bore carrying locking elements movable to locking and unlocking positions with respect to said housing, said cylinder having an outer diameter equal to the diameter of said bore so as to be rotatable when the locking elements are in unlocking position with respect to said housing, said cylinder being formed with a keyway for receiving a proper key in order to move said locking elements to their locking and unlocking positions with respect to said housing, characterized in that said cylinder carries at least one insert of a hard material configured, dimensioned and located such as to prevent pull-out of the cylinder from the housing by a pull-out force applied to the cylinder, and/or by drilling through the locking elements.

Abstract: A lock mechanism for locking a door or the like with a Sabbath control unit comprises a Sabbath control unit comprising an optical device including a light beam emitter and detector spaced apart with a line of sight path between them, the optical device operative to provide output indicating if a light beam emitted by the emitter is received by the detector, and a locking mechanism comprising a moving member operative to be displaced between a locked state position wherein the door is locked and an unlocked state position wherein the door is unlocked, wherein the moving member is operative to block the line of sight path while in the locked state position and to clear the line of site path while in the unlocked state position, and wherein the Sabbath control unit is operative to activate an electronic device in response to output indicating that the light beam emitted by the emitter has not been received by the detector.

Abstract: A key blank comprises a shaft and a head connected to the shaft, the shaft including first and second surface that are oppositely facing, wherein the surfaces are configured to include combination elements to operate a lock and a pair of coaxial operating elements, wherein one element of the pair is operative from the first surface of the shaft and the other element of the pair is operative from the second surface of the shaft, and wherein at least one of the operative elements is a resilient element mounted inside a bore provided in the shaft, wherein the resilient element is operative to exert a compressive force on a pin mechanism of the lock in response to the operative engagement and thereby release the pin mechanism from a lock position, without requiring any pressure on the coaxial element on the other side.

Abstract: A substantially burglary-proof lock, comprises a housing formed with a cylindrical bore defining an inner cylindrical surface, and a cylinder within said bore carrying locking elements movable to locking and unlocking positions with respect to said housing, said cylinder having an outer diameter equal to the diameter of said bore so as to be rotatable when the locking elements are in unlocking position with respect to said housing, said cylinder being formed with a keyway for receiving a proper key in order to move said locking elements to their locking and unlocking positions with respect to said housing, characterized in that said cylinder carries at least one insert of a hard material configured, dimensioned and located such as to prevent pull-out of the cylinder from the housing by a pull-out force applied to the cylinder, and/or by drilling through the locking elements.

Abstract: The present invention is a lock system particularly suited to the requirements of restricting access to an aircraft cockpit, although the invention may equally be applied to a range of other applications. Disclosed is a lock system including a door mounted locking bolt that may be actuated by a handle on the cockpit side of the door and by a key on the cabin side of the door. The key actuator may be disabled from the cockpit side of the door. The bolt is configured to engage a doorframe mounted bolt-receiver the bolt and the bolt-receiver thereby interlocking in a way that holds the bolt in the bolt-receiver in the advent of attempted forced entry to the cockpit, such as by a terrorist. The doorframe elements are further configured so as to automatically release the bolt and allow the door to open freely in the case of a sudden differential is cockpit and cabin air pressure. The automatic release may also be activated a manual switch or by a system override.