An electromagnetic lock having an anti-forced entry mechanism

An electromagnetic lock having an anti-forced entry mechanism including an electromagnetic lock arranged to releasably lock two members together, said electromagnetic lock being connected to said anti-forced entry mechanism, said anti-forced entry mechanism including on a longitudinal axis thereof a serial connection of an inner lock body, a locking cam and an outer lock body, an end of the outer lock body remote from the locking cam being provided with a manually operable lock such that the locking cam is arranged to be rotated between an unlocked and locked position, characterized in that the inner lock body includes an inner lock housing and axially slidably mounted on said longitudinal axis in said inner lock housing is an inner lock shaft which is biased by spring means, said inner lock shaft having a plurality of holes therein which are arranged to cooperate with a respective pin, each pin biased by a respective spring radially mounted in said inner lock housing, such that when the connection between the locking cam and the outer body is broken and the outer lock body is broken away, the inner lock shaft is no longer restrained by the outer body and longitudinal axially moves under the bias of the spring means so that the pins are brought into alignment with the holes under the force of their respective spring to thereby lock the inner lock shaft from rotating.