Patent ID: 6094952
Filing Date: 2000-08-01
Classification: E05B,G07C,Y10T

Abstract:
A dead bolt lock, comprising:a) a lock case;b) a bolt that can be withdrawn into and extended from the lock case, the bolt having a cavity and a first surface;c) a threaded nut, disposed for axial movement in the bolt's cavity, the nut having a post extending therefrom;d) a screw having a threaded portion for rotary engagement with the threaded nut;e) a motor for rotating the screw in a first direction so as to move the nut in an outward direction so as to urge the bolt from the lock case, and in a second direction so as to move the nut in an inward direction so as to withdraw the bolt into the lock case;f) a spring-biased latch; andg) a rocker, adapted to reciprocate between (A) a bolt passing position and (B) a bolt blocking position toward which the rocker is urged by the spring-biased latch, the rocker having:1) a post guide for guiding the post during a first portion the nut's motion along the screw in which the bolt is not fully extended and in which the post opposes the urging of the spring-biased latch so as to cam the rocker toward the bolt passing position;2) an area for receiving the post during a second portion of the nut's motion along the screw in which the bolt is fully-extended or almost fully-extended, and in which the post does not oppose the urging of the spring-biased latch, so that the spring-biased latch urges the rocker into the bolt blocking position; and3) a blocking surface that, when the rocker is in the bolt blocking position, is disposed with respect to the bolt's first surface so as to physically block the bolt from being forced into the lock.