Abstract: For an electronically motivated door lock there is a key carrying magnetic coding for actuating an electronically triggered release mechanism to unlock a door. Insertion of the key in the keyway initially closes a switch to energize the electronic circuit. The electronic circuit is programmed to motivate a motor driven mechanism in successive stages to move a blocking finger into and out of engagement with a notch in a rotatable disc on a cylinder plug which operates the latch bolt. The motor rotates preferably in one direction but by use of a rotating drive pin shiftable from end to end of a transverse slot, the blocking finger is moved alternately into and out of engagement with the notch in response to the successive energizations of the motor.

Abstract: One part of a key-in-knob lock set functions in a normal manner such that when the lock set is unlocked, either the outside or inside knob can be manipulated to open the door by withdrawing the latch bolt from a normal spring latch extended position. When, instead, the lock set is locked, the latch bolt is extended an exceptionally long distance into the frame to a dead bolt position. Extension and retraction of the latch bolt to and from dead bolt position is accomplished by manipulation of a main cam through the agency of a key in the outside or a turn button on the inside.For withdrawing the latch bolt from the normal spring latch extended position, an escutcheon housing for the outside knob or a corresponding escutcheon housing for the inside knob serves, by moving transversely of the axis of rotation of the knob, to rotate a radially extending tooth-like element on the spindle which, acting through the main cam, withdraws the latch bolt.

Abstract: One part of a key-in-knob lock set functions in a normal manner such that when the lock set is unlocked, either the outside or inside knob can be manipulated to open the door by withdrawing the latch bolt from a normal spring latch extended position. When, instead, the lock set is locked, the latch bolt is extended an exceptionally long distance into the frame to a dead bolt position. Extension and retraction of the latch bolt to and from dead bolt position is accomplished by manipulation of a main cam through the agency of a key in the outside knob or a turn button on the inside knob.For withdrawing the latch bolt from the normal spring latch extended position an escutcheon housing for the outside knob or a corresponding escutcheon housing for the inside knob serves, by moving transversely of the axis of rotation of the knob, to rotate a radially extending finger on the spindle which, acting through the main cam, withdraws the latch bolt.

Abstract: A disengaging spindle locking mechanism for the latch bolt of a mortise type lock is actuated by the locking slide which is normally employed to engage a retractor hub to prevent the hub from being rotated. At the inner end of a split spindle where it is in non-rotatable engagement with the retractor hub there is a cam surface. On the inner end of a locking slide is a cam surface which cams the spindle out of engagement with the hub as hub action is blocked by the slide. Thereafter, should force be applied to the spindle, it will merely spin in place and no damage will be done to the lock mechanism such as might otherwise be done by unauthorized persons to force open the lock.

Abstract: A pin tumbler lock has a housing, a cylindrical key plug provided with a keyway rotatable in the housing, a shear line between the plug and the housing, pin tumbler bores with aligned parts respectively in the housing and the key plug and spring pressed outer and inner pin tumblers in each bore. In one of the bores is an extra frangible graphite tumbler of substantially the diameter of the other pin tumblers. When construction key is inserted in the keyway the graphite tumbler and the other pin tumblers meets at the shear line permitting the lock to unlock. When construction is finished a conversion key is inserted in the keyway and the graphite tumbler is shifted to a position crossing the shear line whereupon the graphite tumbler is shattered by rotation of the key plug. Thereafter the lock can not be unlocked by the construction key but can be unlocked by the householder's key.