Electronic lock with combined alarm system - has series connected thyristors and switching keys for locking and unlocking

摘要

The d.c. electronic lock has several switching keys actuated in specified order for unlocking. An arbitrary switching key among the remaining switching keys is operated for locking purposes. The lock is insensitive against operating voltage variation and stray pulses is used also as monitoring or alarm system with existing electrical arrangements e.g. door switches and the circuit of a passenger motor vehicle. The lock has several directly series connected thyristors. The thyristors are connected each by current limiting resistors to a pole of the operating direct current course. The thyristors are connected by unlocking switching keys to a firing voltage.