36 by a large diameter portion 47 of a locking lock cam 48 which is slideably disposed on a rod 50 a cap 52 is rigidly affixed at an extremity of rod 50 a small diameter portion 54 is joined to large diameter portion 47 by a ramp portion 56 a second plurality of radial holes 58 each contains a locking ball 60 an unlocking lock cam 62 is slideably disposed on rod 50 a collar 63 retains unlocking lock cam 62 on rod 50 unlocking lock cam 62 includes a large diameter portion 64 joined to a smaller diameter portion 66 by a ramp portion 68 a coil spring 70 on rod 50 biases locking lock cam 48 and unlocking lock cam 62 apart collar 63 is rigidly affixed to actuating rod 34 referring now momentarily to fig3 there are shown three radial holes 44 angularly spaced about bolt 24 each containing a locking ball 46 maintained in an outward locking position with annular locking groove 36 by large diameter portion 47 returning now to fig2 when actuating rod 34 is moved downward to unlock dead bolt lock 10 cap 52 urges locking lock cam 48 downward against the resistance of coil spring 70 until small diameter portion 54 is moved adjacent locking ball 46 locking ball 46 is thereby enabled to move inward to thereby disengage from annular locking groove 36 this permits bolt 24 to be pulled downward by continued downward movement of actuating rod 34 referring now to fig4 an intermediate stage of movement.