A method for operating a deposit-operated lock system for a borrowed object, in particular for a transport trolley which can be moved by hand. There is also described a suitable deposit-operated lock system. A key that is held in a deposit lock is released when an electric drive drives a carriage that is displaceably mounted on a blocking element in an initial position.

A padlock is configured to be locked and unlocked by a key and includes a lock body having an internal cavity with a locking mechanism and a keyway extending through the lock body into the internal cavity to provide access to the locking mechanism by the key. The locking mechanism is configured to be selectively moved over a range of positions when the key is received therein to lock and unlock the padlock. The keyway has an eccentric profile that permits the key to be removed from the locking mechanism in only a single position of the range of positions.

A padlock is configured to be locked and unlocked by a key and includes a lock body having an internal cavity with a locking mechanism and a keyway extending through the lock body into the internal cavity to provide access to the locking mechanism by the key. The locking mechanism is configured to be selectively moved over a range of positions when the key is received therein to lock and unlock the padlock. The keyway has an eccentric profile that permits the key to be removed from the locking mechanism in only a single position of the range of positions.

A key guard system includes a key cover including a base and a retractable sheath. The retractable sheath includes at least one retracting point, a power source, a wireless connector and a locking mechanism. Further, the key guard system includes a reader having a powered. The key cover and the reader are in wireless communication with each other and further in wireless communication with an application of a mobile device. The key guard system is configured to secure a key within the retractable sheath and prevent tampering and otherwise unwanted removal of the key from the retractable sheath.

A key guard system includes a key cover including a base and a retractable sheath. The retractable sheath includes at least one retracting point, a power source, a wireless connector and a locking mechanism. Further, the key guard system includes a reader having a powered. The key cover and the reader are in wireless communication with each other and further in wireless communication with an application of a mobile device. The key guard system is configured to secure a key within the retractable sheath and prevent tampering and otherwise unwanted removal of the key from the retractable sheath.

A tubular lock and its operating key have safety features that render the lock and key well suited for use with food freezer appliances and the like where the keyway of the lock extends horizontally. The tubular portion of the operating key, and the keyway of the tubular lock are cooperatively configured so a key inserted into the keyway of the lock fits quite loosely and is minimally supported even when fully inserted. The graspable bow of the operating key is made unusually long causing the center of gravity of an inserted operating key to be spaced far from the front face of the lockso the weight of the loosely fitting and minimally supported operating key levers the graspable bow downwardly, causing the key to drop from the keyway unless being held in the keyway. Gravity is optimally used to effect key ejection.

A method for operating a deposit-operated lock system for a borrowed object, in particular for a transport trolley which can be moved by hand. There is also described a suitable deposit-operated lock system. A key that is held in a deposit lock is released when an electric drive drives a carriage that is displaceably mounted on a blocking element in an initial position.