Door lock attachment
OwnerAdolph Mosesinventor
Life of this patent
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Abstract
A cheap, one piece, pocketable, one hand operated, snap on or off clamping attachment for a lock bolt thumb knob for preventing the lock from being opened from the outside. One end of the attachment has connected elements that can embrace the thumb knob in either its vertical or horizontal position. The connected elements have two extended legs that spring grip the door knob hub and can bias the attachment to its operative position or hold it in its inoperative position. This cheap device takes the place of a more expensive bolt and its installation cost.
Claims11
A one-hand operated, snap on and off, pocketable security locking attachment for a door lock having a thumb knob actuated bolt and a door knob hub, a single piece of material formed to embrace loosely the upper, lower, and lateral surfaces of the thumb knob, having shallow lips engaging the rear surfaces of the thumb knob but otherwise the embracing elements are open, both front and rear, and the thumb knob embracing elements extended to embrace the door knob hub.
Dependencies are inferred from the claim text.