Abstract: Access-limiting apparatus comprising a body through which an access passageway is formed. A second passageway is formed in the body at a position intersecting the access passageway and a lock plate is slidably movable in the second passageway to a locked position closing the access passageway. Locked means on the lock plate and the body cooperate to secure the lock plate in the locked position. A key plate which is matched with the lock plate is provided with lock release means operable to engage the lock means so as to release the lock plate from the body.

Abstract: The safety device comprises a rotatable lock-operating rotor having a first key slot extending transversely thereof, a non-rotatable inner cylindrical body adapted for fixed securement to a door or the like, and a hollow cylinder embracing the rotor and the cylindrical body and having its inner end fixedly secured to the cylindrical body or member. Key-operable pins, plungers or pistons interconnect the rotor and the fixed cylindrical body to prevent rotation of the rotor. The rotor is formed with a first key slot extending transversely thereof and the hollow cylinder has a closed outer end formed with a second key slot extending transversely thereof. A rotatable diaphragm member is interposed between the fixed outer end of the hollow cylinder and the rotor, and has a third key slot extending transversely thereof. The rotor may be disconnected from the fixed cylindrical member by a key inserted into the first slot to engage the pins, plungers or pistons.

Abstract: A protecting device for door latches and locks in vehicles exposed to the elements, said device including a flexible magnetic frame for sealing a water repellent frangible sheet of material over the door latch or lock.A method for preventing freezing of door latches and locks in vehicles exposed to the elements, said method utilizing said protective device.

Abstract: A locking device comprised of a base plate secured about a keyhole and a cover plate pivotally disclosed thereon including locking means which can be disposed in aligned openings in the plates to selectively lock one to the other to either expose or cover the keyhole.

Abstract: A lock shielding assembly for preventing unauthorized access to a lock by providing a shield over the lock which can easily be removed by authorized individuals, while requiring an unauthorized person an extensive amount of time to open. The assembly includes a housing which can be superimposed over the front face of the lock. The housing includes a slot positioned between a front and rear wall and includes cooperating openings in the walls providing access to the key hole of the lock. A shield plate is slidably mounted in the slot for movement to and from a position covering the lock. A plurality of pins extend into the front wall, selectable ones of the pins extending through the front wall and into engagement with the shield plate to retain the shield plate in its position covering the lock. The location of the selected pins are known only to the authorized user who can easily remove them, while the unauthorized individual must remove all or most of the pins.

Abstract: A cylinder lock assembly includes a tubular housing rotatably receiving therein an elongated unitary barrel having a configuration suitable for single step diecast fabrication without the extremely complex coring and secondary operations heretofore required. The barrel contains a plurality of easily diecast and assembled, open sided tumblers in face to face sliding engagement, each of which is individually engaged by a finger of a unitary, multi-fingered resilient member for urging the respective tumbler into a locked position until displaced by a key moved transversely through a slot formed in each tumbler. Modified forms include a dust door receiving cavity which has a dust cover integral with the barrel and a dust door closing spring integral with the tumbler contacting resilient member. Also, simplified structures are provided to retain the barrel in the housing.

Abstract: A cylinder lock, particularly useful as a vehicle steering lock, of which the barrel is axially slidable between an outer, locked position and an inner position in which the barrel can be rotated by an appropriately coded key. Insertion of a key into the key passage of the barrel when the barrel is in the outer position is prevented by closure elements which are displaced by the leading end of the key, axial movement of the barrel from the outer to the inner position occurring during such displacement.

Abstract: An apparatus is disclosed for preventing tampering with a locking mechanism, such as the conventional cylinder lock, which has a keyway therein and is normally rotatable when a key is in the keyway. A locking arm normally holds the locking mechanism to prevent rotation thereof even when the key or a foreign device is in the keyway. In order to release the locking arm and rotate the locking mechanism, access to the keyway is first blocked thereby prohibiting someone from attempting to pick the lock with a foreign device.

Abstract: The present invention relates to a lock cover device particularly intended for use with so-called mortise locks. The device is fabricated of resilient polymeric material which may be readily mounted over the mortise lock, normally without the requirement for completely removing the lock from its mounted position and is characterized by the incorporation of a movable shutter member selectively shiftable between a stable sealing position and a stable keyway exposing position, the assembly including resilient cam and follower means for selectively biasing the shutter to one or the other of said stable positions, the shutter being preferably unstable at any intermediate position.

Abstract: Lock mechanism comprising a key operable cylinder rotatably mounted in a lock body, and characterized by internal and external weather seals for the cylinder. The external seal comprises annular sealing means encircling an enlarged head on the front of the cylinder. The internal seal comprises a keyhole shutter confined in a cavity in the front of the head.

Abstract: A removable case for covering a lug locking device to protect such locking device from adverse external conditions. The lug locking device includes a central body portion having a continuous side wall and a top wall and a bottom wall. The bottom wall is disposed in juxtaposition to a member which holds the lug. The removable case is provided for disposition over the body of such lug locking device. This removable case includes a top wall which snugly engages the top wall of the locking device and a continuous side wall which snugly engages the continuous side wall of the locking device. In a preferred embodiment of the present invention, the case may include a bottom wall which would extend over a portion of the bottom wall of the locking device. In one aspect of the present invention, the top wall of the cover is removable and in another aspect of the present invention, the top wall is integral with the continuous side wall.

Abstract: A lock cylinder cover arrangement including a spring detent secured at one end thereof to the underside of a cover base or escutcheon, wherein the spring detent has a stop surface and a cam surface formed adjacent the other end thereof, the stop surface serving to hold open a cover pivotally mounted on the escutcheon, and the cam surface serving to be cammed downwardly toward the lock cylinder by an edge of the key-head to thereby release the stop surface from the cover and permit the latter to be biased closed upon withdrawal of the key from the lock cylinder.