Abstract: A security system employs a combination memory and processor which upon insertion of a key, is operative in a first mode to store a predetermined digital code associated with the key in a memory associated with the processor. During this first mode, any digital code manifested by any one of a plurality of keys is automatically stored in the memory by the insertion and withdrawal of the selected key. Thereafter, the processor serves to recognize only the selected key to enable activation of a controlled mechanism in a second mode again manifested by the insertion of the selected key within the access slot. The combination processor can be paralleled to enable one to control a single entranceway by means of a plurality of keys each associated with one processor or to employ different keys at one location to initiate other functions as activation of burglar alarms and so on. The system has applicability as a security system and has utility in many commercial and residential applications.

Abstract: This invention relates to electrical combination locks that compare a sequence of input signals with a stored sequence to permit the lock to be opened. The mechanical features of the lock are characterized by an arm and control member within the lock structure that inhibit bolt motion in the absence of the proper combination. The electrical circuit enables the combination to be changed readily and uses very little power.