Patent ID: 7503600

Claim:
A locking arrangement for locking a first part and a second part together, one of said first and second parts being turnable relative to the other of said first and second parts about a swing axis and being a door, a hatch or the like and the other of said first and second parts being a door frame or the like, the locking arrangement comprising: a lock unit installable in the first part and including a lock body and a first locking element having a first free end region which, when installed, extends generally transversely of said swing axis, a counterpart unit installable in the second part and including a second locking element having a second free end region which, when installed, extends generally transversely of said swing axis, an acting arm that includes a gripping formation and is pivotally mounted in the lock unit for movement relative to the lock body about a pivot axis, whereby the acting arm can turn in relation to the lock unit so that the acting arm moves transversely in relation to the first free end region between a projecting position in which the gripping formation is relatively closer to said first free end region and a withdrawn position in which the gripping formation is relatively farther from said first free end region, and a safety catch that is operable selectively either to lock the acting arm against movement from the projecting position to the withdrawn position or to permit the acting arm to move from the projecting position to the withdrawn position, the safety catch comprising first and second arms each having a first end and a second end, the first and second arms being hinged together at the respective first ends forming a toggle joint between the arms, the second end of the first arm being hinged to the acting arm at a location spaced from said pivot axis, and the second end of the second arm being hinged to the lock body, and wherein said units cooperate in such a manner that when said units are installed and said one part is in a closed position relative to said other part, the free end regions of said locking elements overlap each other, and when the acting arm is in the projecting position and the safety catch locks the acting arm against movement from the projecting position to the withdrawn position, the second free end region is captive between the gripping formation and the first free end region for achieving locking action by the locking arrangement, whereas when the acting arm is in the projecting position and the safety catch permits the acting arm to move from the projecting position to the withdrawn position, the locking action is released.