Security lock

Claim 2

A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an oblong periphery and operable from the inside and said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate integral with said escutcheon plate and including opposite side members each including a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivoted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside and has an intermediate portion shaped approximately complementally to the adjacent periphery of said knob to rest in such restraining engagement at its other end upon the other of said lugs as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob.

Claim 3

A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate separate from said lock but fixedly associated with portions of said lock which are located at the inside of said door by being clamped between the door and said escutcheon plate, said anchor plate including side members extending toward areas at opposite sides of said knob, and further comprising an elongate saddle fixedly pivoted at one of its ends to one of said side members and which saddle when the knob is in a locking position extends from said one side member intimately alongside said knob and into such restraining engagement at its other end with the other of said side members as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock.

Claim 4

A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door and which includes an escutcheon plate positionable at the inner side of said door; said device comprising an anchor plate separate from said lock but fixedly associated with portions of said lock which are located at the inside of said door by being clamped between the door and said escutcheon plate, said anchor plate including side members extending toward areas at opposite sides of said knob, and further comprising an elongate saddle fixedly pivoted at one of its ends to one of said side members and which saddle when the knob is in a locking position extends from said one side member intimately alongside said knob and into such restraining engagement at its other end with the other of said side members as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock.

Claim 5

A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door; said device comprising an anchor plate fixedly associated with portions of said lock which are located at the inside of the door, said anchor plate including opposite side members each incluing a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivoted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside said knob to rest in such restraining engagement at its other end upon the other of said lugs as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob and said other of said lugs having an upwardly flared outer edge portion restraining said other end of said saddle against unintended dislodgement from the last mentioned lug.

Claim 6

A security device for a lock which is operable for locking and unlocking thereof by a key operable from the outside of a related door and by a knob having an irregular periphery and operable from the inside of said door; said device comprising an anchor plate fixedly associated with portions of said lock which are located at the inside of the door, said anchor plate including opposite side members each incluing a lug extending approximately perpendicularly to the adjacent inner surface of said related door, and said device further comprising an elongate saddle fixedly pivoted at one of its ends to one of said lugs for pivoting said saddle in a plane approximately perpendicular to said door surface and which saddle when the knob is in a locking position extends intimately alongside said knob to rest in such restraining engagement at its other end upon the other of said lugs as to be held against said knob in a security position of said saddle to limit turning of the knob to an extent material to the operation of the lock, said saddle being sufficiently resistant to deformation to afford said limitation to turning of the knob and said other of said lugs having an upwardly flared outer edge portion restraining said other end of said saddle against unintended dislodgement from the last mentioned lug.