Abstract: A pick-proof lock cylinder is disclosed wherein a set of lock pins accommodates the cut notches of a key and biasing means are angularly disposed to the lock pins to abut and hold the ends of the pins in locking positions. Attempts to pick the set of pins are frustrated by the interference of the biasing means. The biasing means are offset to the axis of the locking pins so that upon withdrawal of the key, the biasing means keeps the locking pins in raised condition. At least one of the locking pins is in abutment with a driver pin, so that the driver pin is disposed outside the shear line of the lock cylinder in its housing, and whereupon key insertion, the lock pin driver pin abutment line is coincident with the lock cylinder shear line so as to permit rotation of the cylinder in its housing.

Abstract: A two dead bolt door lock is disclosed wherein the bolts are transversely disposed and wherein the bolts are disposed one behind the other in the locked position so as to provide a secure locking mode. When door mounted, and in the locked position, a vertical bolt is disposed on the inside of the door adjacent the jamb and a horizontal bolt is mounted in the jamb. Attempts to jimmy the horizontal bolt in its line of least resistance are frustrated by the presence of the vertically locked bolt acting against the jimmying force. The locks are both operated by a single key actuated cylinder and/or hand knob through a common connection rod with coordinated cam actions. In another embodiment, keys may be employed on both the inside and the outside of the door.