Doorknob locking device

Claim 2

A doorknob locking device adapted to mount on a doorknob unit having a front doorknob provided with a narrowed neck behind the doorknob comprising: a one-piece doorknob locking unit adapted to slide over the doorknob, said unit including a generally U-shaped hasp having a pair of side legs and a closed end portion joining the side legs for straddling the neck of the doorknob, a bracket having opposite side arms rigidly attached to the side legs and extending normal thereto and forwardly around opposite sides of the doorknob and an intermediate closure portion joining the side legs and overlying the outer face of the doorknob to block the insertion of a key into the doorknob, and adjustable lock means extending between said side legs to close the open end of the hasp around the neck portion of the knob, said lock means being adjustable lengthwise of the side legs and selectively movable into locking engagement with the side legs whereby to retain said closure portion over the outer face of the doorknob.

Claim 3

A doorknob locking device as set forth in claim 1 wherein one of said side legs is longer than the other and the longer side leg has a terminal stop preventing the lock member from sliding from the hasp.

Claim 4

A doorknob locking device as set forth in claim 1 wherein said lock member is of the tumbler type and actuated by a key in a cylinder, said cylinder being operatively associated with tumbler elements alternately movable into and out of engagement with a series of notches in the hasp.

Claim 5

A doorknob locking device adapted to mount on a doorknob unit of the type having a front doorknob and a narrowed neck portion behind the doorknob comprising: a generally U-shaped hasp including a pair of said legs and a closed End portion for straddling the narrowed neck portion of the doorknob, each said side leg having a series of notches formed at spaced intervals along the length thereof, an outer guard projecting forwardly from the hasp around the midsection of the doorknob when the hasp is straddling the neck portion, said guard including a bracket having a pair of side arms with inturned inner ends rigidly attached to the side legs of the hasp adjacent the closed end portion and an intermediate closure portion joined to the side arms extending normally of the side arms across the outer face of the doorknob and a disk affixed to the outer surface of the bracket and dimensioned to cover the outer face of the doorknob so as to block the insertion of a key into the doorknob, and a tumbler-type lock member extending across said side legs, said lock having a pair of spaced parallel open-ended sockets through which said side legs slidably move, said lock having at least one key-actuated inner tumbler element alternately movable out into the socket to a selected notch in at least one of the hasp legs in a lock position and movable back into the socket in a retracted position whereby to position the lock member at a selected position along the side legs and block the insertion of a key into a keyhole on the doorknob.

Claim 6

A doorknob locking device adapted to mount on a doorknob unit of the type having a front doorknob and a narrowed neck portion behind the doorknob comprising: a generally U-shaped hasp including a pair of said legs and a closed End portion for straddling the narrowed neck portion of the doorknob, each said side leg having a series of notches formed at spaced intervals along the length thereof, an outer guard projecting forwardly from the hasp around the midsection of the doorknob when the hasp is straddling the neck portion, said guard including a bracket having a pair of side arms with inturned inner ends rigidly attached to the side legs of the hasp adjacent the closed end portion and an intermediate closure portion joined to the side arms extending normally of the side arms across the outer face of the doorknob and a disk affixed to the outer surface of the bracket and dimensioned to cover the outer face of the doorknob so as to block the insertion of a key into the doorknob, and a tumbler-type lock member extending across said side legs, said lock having a pair of spaced parallel open-ended sockets through which said side legs slidably move, said lock having at least one key-actuated inner tumbler element alternately movable out into the socket to a selected notch in at least one of the hasp legs in a lock position and movable back into the socket in a retracted position whereby to position the lock member at a selected position along the side legs and block the insertion of a key into a keyhole on the doorknob.