Pin tumbler lock with pull resistant plug

A cylinder lock comprising:

• a lock housing defining a circularly cylindrical bore and a plurality of housing pinways;
• a circularly cylindrical sleeve means rotatably mounted in said bore and having a circularly cylindrical passage with a central axis eccentric to the axis of said bore, said sleeve means defining a plurality of sleeve pinways aligned with said housing pinways;
• a cylindrical plug rotatably mounted in said passage and defining a longitudinally extending keyway, said plug further defining a plurality of transversely extending plug pinways intersecting said keyway and aligned with said sleeve pinways;
• a plurality of stacked pins longitudinally movable within each set of said aligned housing, sleeve and plug pinways;
• bias means forcing said stacked pins toward said keyway;
• rotational coupling means limiting rotation of said plug within said passage;
• and
• longitudinal coupling means for preventing longitudinal movement of said plug and said sleeve means with respect to said housing, said coupling means comprising selective keying means engaging said plug and said sleeve means so as to prevent relative longitudinal movement therebetween while allowing relative rotational movement therebetween and further comprising external recesses in the outer surface of said sleeve means and coincident with said sleeve pinways, said external recesses being longitudinally spaced apart on the outer surface of said sleeve means.