Cylinder lock

In a cylinder lock including a casing;

• a sleeve rotatably disposed in said casing;
• a key cylinder disposed rotatably within said sleeve;
• tumblers slidably disposed within slits formed in said key cylinder for engagement with the sleeve;
• and a connector drivingly connected to a lock device;
• the improvement comprising:
• an axial cam and a radial projection each provided on the key cylinder;
• a rotator being engageable with said sleeve having a protrusion in contact with said axial cam of the key cylinder;
• said rotator being formed with an internal notch for receiving said projection of the key cylinder;
• a stopper positioned adjacent to said rotator and having at least one lug engageable with a recess of said casing;
• opposed spring pressed pins disposed radially within said key cylinder operable to engage radial cams formed on said rotator and on said stopper;
• an axial spring positioned between said stopper and said connector for resiliently urging said stopper toward said rotator and into releasable engagement with said recess of said casing;
• engagement means on said rotator and on said connector for making a driving connection therebetween;
• said rotator normally in moveable engagement with said sleeve;
• said stopper normally in moveable engagement with said casing;
• the protrusion normally in moveable engagement with said axial cam;
• and
• said connector and said rotator normally out of engagement;
• said key cylinder being releasable from said sleeve upon insertion of a proper key therein, whereby manual rotation of said key cylinder by means of a proper key operates to effect camming action between the axial cam and said protrusion to create axial motion effective to (a) release engagement of said rotator and said sleeve (b) release engagement of said stopper with said casing (c) operate the engagement means and (d) drive said radial spring pressed pins inwardly as the pins follow said radial cams of said rotator and said stopper whereby further rotation of the key cylinder causes the rotator, stopper and connector to move as a unit to operate a lock device;
• and
• return spring means operable upon release of said proper key for returning said rotator, said stopper and said connector to their original position whereby said spring pressed pins are free to move outwardly automatically so that camming action returns the key cylinder to its original position.