Key controlled pick resistant lock

A lock mechanism operated upon insertion and removal of a key comprising, an enclosing housing and a transversely extending housing containing a latch therein, a shaft mounted in the first housing, an inner cylindrical member journaled on said shaft and having a plurality of spaced apertures therein, a hood carried by said shaft and encircling said inner cylindrical member, said hood having a window therein, an outer cylindrical member journaled on said hood and having a plurality of apertures therein with a spring biased pin mounted in each aperture, said pins being slidably positioned through said outer cylindrical member and adapted to engage the apertures in the inner cylindrical member through said window in said hood;

• a keyway in said first housing;
• a key having a surface with a plurality of sequential indentations therein which when inserted into the keyway engage the exposed ends of the pins in the outer cylindrical member to rotate the outer cylindrical member urging said pins into engagement with the apertures with the inner cylindrical member to rotate the inner cylindrical member simultaneously therewith;
• means included in part in said enclosing and in part in said outer cylindrical member to prevent rotation of the outer cylindrical member except in a predetermined time sequence with the insertion of said key;
• and means included in part in said inner cylindrical member and in part with the latch to cause operation of the latch upon complete insertion of the key and subsequent withdrawal of the key.

A lock mechanism operated upon insertion and removal of a key comprising, an enclosing housing and a transversely extending housing containing a latch therein, a shaft mounted in the first housing, an inner cylindrical member journaled on said shaft and having a plurality of spaced apertures therein, a hood carried by said shaft and encircling said inner cylindrical member, said hood having a window therein, an outer cylindrical member journaled on said hood and having a plurality of apertures therein with a spring biased pin mounted in each aperture, said pins being slidably positioned through said outer cylindrical member and adapted to engage the apertures in the inner cylindrical member through said window in said hood;

• a keyway in said first housing;
• a key having a surface with a plurality of sequential indentations therein when inserted into the keyway to engage the exposed ends of the pins in the outer cylindrical member to rotate the outer cylindrical member urging said pins into engagement with the apertures with the inner cylindrical member to rotate the inner cylindrical member simultaneously therewith;
• means included in the inner cylindrical member and the shaft to prevent rotation of the inner and outer cylindrical members in the event the apertures in the key do not cause predetermined engagement of the pins with the inner cylindrical member;
• and means included in part in said inner cylindrical member and in part with the latch to cause operation of the latch upon complete insertion of the key and subsequent withdrawal of the key.

A lock mechanism operated upon insertion and removal of a key comprising, an enclosing housing and a transversely extending housing containing a latch therein, a shaft mounted in the first housing, an inner cylindrical member journaled on said shaft and having a plurality of spaced apertures therein, a hood carried by said shaft and encircling said inner cylindrical member, said hood having a window therein, an outer cylindrical member journaled on said hood and having a plurality of apertures therein with a spring biased pin mounted in each aperture, said pins being slidably positioned through said outer cylindrical member and adapted to engage the apertures in the inner cylindrical member through said window in said hood;

• a keyway in said first housing;
• a key having a surface with a plurality of sequential indentations therein which when inserted into the keyway engage the exposed ends of the pins in the outer cylindrical member to rotate the outer cylindrical member urging said pins into engagement with the apertures with the inner cylindrical member to rotate the inner cylindrical member simultaneously therewith;
• and means included in part in said inner cylindrical member and in part with the latch to cause operation of the latch upon complete insertion of the key and subsequent withdrawal of the key;
• and means coupling the inner cylindrical member to said latch after the inner and outer cylindrical members have been rotated with complete key insertion and upon the withdrawal of the key to operate the latch.