Locks – Operating mechanism – Key
Reexamination Certificate
2007-10-23
2007-10-23
Barrett, Suzanne Dino (Department: 3676)
Locks
Operating mechanism
Key
C070S430000
Reexamination Certificate
active
11633364
ABSTRACT:
Apparatus is simply hung on a deadbolt knob when the deadbolt is in locked position. It prevents the deadbolt knob from rotating enough to retract the deadbolt. This ensures that the door cannot be unlocked from the outside. A passage in an upper end of the apparatus is dimensioned to receive the deadbolt knob. The deadbolt knob is not round. The passage has side walls narrow enough to prevent the deadbolt knob from rotating freely within the passage. As the knob is rotated, the knob engages the side walls of the passage so that the entire apparatus rotates until the lower end of the apparatus engages a fixed element that prevents further rotation of the knob. That fixed element is either the door jamb or the doorknob. This immobilizes the knob and deadbolt.
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Barrett Suzanne Dino
Blum Alvin S.
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