Abstract: The improved safe door locking arrangement includes a pair of oppositely extending dovetail locking bolts. The locking bolts are eccentrically attached to a crank wheel and are actuated responsive to rotation of the wheel. The wheel is spring loaded for easier operation. In the extended or locked position, a combination lock controlled bolt locks the dovetail bolts in their extended condition. A further feature is a safety bolt which in turn locks the combination lock controlled bolt in the locking position, if attempts are made to dislodge the combination lock.

Abstract: The device serves to lock the locking bolt of a cylinder lock in its locking position when an unauthorized removal of the locking cylinder is effected. A lever mounted with the housing of the cylinder lock rests against a portion of the locking cylinder which effects swivelling of the lever upon the removal of the locking cylinder. The locking bolt is lockable by a locking piece which is spring-loaded in the direction of the locking position and is held in the unlocking position by the lever in the non-swivelled state thereof. The locking piece is released when the lever has been swivelled by the locking cylinder.

Abstract: A lock cylinder assembly for a motor vehicle ignition switch includes a lock core rotatable in a cylindrical opening of a cyclindrical sleeve anchored in a housing. A lock bar acts between the core and the sleeve to normally lock the core against rotation and to unlock the core to permit rotation when a properly bitted key is inserted into a key slot of the core. A frangible retainer acts between the core and the sleeve to define a normal axial relation therebetween and fractures under an axial extracting force to permit axial outward movement of the core relative the sleeve. A second retainer acts between the sleeve and the core and is effective upon limited axial movement of the core permitted by fracture of the frangible retainer to block further axial movement and rotational movement of the core relative the sleeve.

Abstract: A lock cylinder assembly for a motor vehicle ignition switch includes a lock core rotatable in a cylindrical opening of a housing. A lock bar acts between the core and the housing to normally lock the core against rotation and to unlock the core to permit rotation when a properly bitted key is inserted into a key slot of the core. A frangible retainer acts between the core and the housing to define a normal axial relation therebetween and fractures under an axial extracting force to permit axial outward movement of the core relative the housing. A second retainer acts between the housing and the core and is effective upon limited axial movement of the core permitted by fracture of the frangible retainer to block further axial movement and rotational movement of the core relative the housing.

Abstract: A tamper-proof backpack is disclosed which is formed of plastic or similar molded construction. The backpack includes a concave rear wall and shoulder straps which enable the backpack to be carried on the back of a user. The backpack may also be hand-carried and a cover is provided for fitting over the concave rear wall thereby hiding the shoulder straps when the backpack is so carried. The backpack includes a locking mechanism which prevents unauthorized access into the interior of the backpack and which also enables the backpack to be secured to a stationary object. The locking mechanism may also be used to secure a conventional luggage-suitcase or similar article to a stationary object.

Abstract: A key operated locking unit is permanently attached to a bicycle frame member. A flexible tether has one end permanently secured to the bicycle locking unit and has a plug-in lock element on its free end adapted to enter a receiver on the locking unit after first being looped around a stationary anchoring member and around part of the bicycle frame. Locking of the bicycle becomes essentially a one hand operation in the shortest possible time.

Abstract: A compact device for locking an article, such as an office machine, to a desk or fixed base comprises a flexible cable secured at one end to a key-operated lock, and at the other end to an anchor block. The anchor block is in turn secured to the desk with a one-way screw. The lock is engageable with a plate member permanently secured to the bottom of the machine. The plate member is step-shaped adjacent the machine so that the lock engaging portion of the member is maintained parallel to and above the surface of the desk. This prevents interference between the bottom of the lock and the desk, and expedites engagement of disengagement of the lock. The cable retains the office machine in proximity to the desk, yet permits the position of the machine to be adjusted to suit the user.

Abstract: An automotive trunk lid latch assembly including a housing, a pair of latching members and a cam member, each rotatably mounted in the housing, a shaft extending into the housing from a lock cylinder assembly and adapted to rotate the cam member in response to manual rotation of a key in the lock cylinder assembly, and a spring-loaded lever rotatably mounted intermediate the cam member and one of the latching members and retained therebetween by the end of the shaft, and adapted to be rotated by the cam member to, in turn, unlatch the latching members. In the event of removal of the shaft, the spring-loaded lever will snap away from the cam member into an inoperable position, thus preventing any unlatching operation thereafter by the insertion of a probe or a screwdriver to rotate the cam member.

Abstract: A cylinder lock comprising an outer cylinder enclosing a hollow rotatable inner cylinder which, in turn, encloses a plurality of locking discs turnable with the key of the lock. Between the outer cylinder and the peripheral edges of the locking discs there is a locking bar locking the inner cylinder to the outer cylinder. This bar is movable from a position locking the inner cylinder, in which position the bar is located partly in a groove in the inner wall of the outer cylinder to a position releasing the inner cylinder. In the latter position the locking bar is received in a channel formed jointly by locking bar notches in the peripheral edges of the locking discs when the discs are brought to a certain position. The groove in the inner wall of the outer cylinder is provided with a lateral step, so that a deep groove portion and a shallow groove portion are formed.