Abstract: A locking device comprises a support attached to a door and a striker attached to an adjacent door jamb. A bolt carried by the support includes coplanar ends received in slot members of the support. A central offset section of the bolt carries a padlock which is movable between locked and unlocked positions. In the locked padlock position, the padlock body abuts a shoulder of the support, preventing the bolt from moving. In the unlocked padlock position, the padlock body moves downwardly to clear the shoulder and allow belt movement. The locking device is symmetrical about a vertical axis and accordingly can be used without modification on left-swing and right-swing doors. The support and bolt are designed to be made from simple stamped metal pieces.

Abstract: A locking device is used to lock a closure, such as a garage or metal door and includes a housing to receive a padlock. The housing is configured to obstruct access to the padlock shackle so that it cannot be cut with bolt cutters. The housing also includes a pair of aligned openings which allow a shackle of a second padlock to be passed through the housing to prevent unlocking movement of the first padlock. In one embodiment of the invention, the locking device includes a bolt mechanism on the inside of the housing which is generally hook-shaped and positioned to abut a locked padlock supported on the inside of the housing. When the padlock is unlocked, the padlock body moves out of the way of one end of the hook-shaped structure thereby allowing the bolt to be retracted to an unlocked position.