Door locking device

Claim 1

In a door locking device, the combination of: a. an inside and an outside knob rotatably supported on the inside and the outside, respectively, of a door, said inside and outside knobs having respective axes which are aligned with each other; b. an actuator rod extending along said aligned axes of said inside and outside knobs, said actuator rod being rotatable simultaneously with at least said inside knob and being movable longitudinally between a first and a second position relative to said inside and outside knobs; c. a push button arranged at one end of said actuator rod and projecting out of said inside knob, said push button being depressible to move said actuator rod from said first to said second position; d. means for releasably holding said push button in a depressed position and hence for retaining said actuator rod in said second position; e. a first clutch including: 1. a driving member fixedly supported by said outside knob for simultaneous rotation therewith, said actuator rod projecting into said outside knob by rotatably and longitudinally movably extending through said driving member; and 2. a driven member fixedly mounted on the other end of said actuator rod projecting into said outside knob, said driving and driven members of said first clutch being interengageable only when said actuator rod is in said first position to permit said actuator rod to be rotated by said outside knob; f. a lock assembly within said outside knob adapted to be operated by a key, said lock assembly including a rotor rotatable relative to said outside knob by said key; g. a slide within said outside knob constrained to linear movement between a third and a fourth position along said axis of said outside knob relative to the same, said slide being rotatable simultaneously with said outside knob; h. spring means biasing said slide from said third toward said fourth position; i. cam means within said outside knob effective to permit said slide to be moved from said third to said fourth position by said spring means when said rotor is rotated in a predetermined direction by said key, said cam means being also effective to move said slide from said fourth to said third position against the bias of said spring means when said rotor is rotated in the opposite direction to said predetermined direction by said key; and j. a second clutch including: 1. a driving member fixedly mounted on said slide for simultaneous rotation therewith; and 2. a driven member formed at said other end of said actuator rod, said driving and driven members of said second clutch being interengageable only when said actuator rod is in said second position and said slide in said fourth position to permit said actuator rod to be rotated by said outside knob.