Bistable multivibrator means

Claim 1

AN ALARM SYSTEM COMPRISING DETECTION MEANS SENSITIVE TO VIBRATION, A BISTABLE MULTIVIBRATOR INCLUDINGA DIFFERENCE AMPLIFIER MEANS, AMPLIFYING AND FILTERING MEANS CONNECTED BETWEEN SAID DETECTION MEANS AND SAID DIFFERENCE AMPLIFIER MEANS FOR FEEDING TO THE LATTER SIGNALS FROM SAID DETECTION MEANS, RECTIFYING MEANS FOR RECEIVING AN OUTPUT FROM SAID FILTERING MEANS, AN INTEGRATOR CONNECTED TO SAID RECTIFYING MEANS AND IN TURN CONNECTED TO SAID DIFFERENCE AMPLIFIER MEANS TO CONTROL ACTUATION OF THE BISTABLE MULTIVIBRATOR BY CONTROLLING THE AMPLITUDE OF THE SIGNAL NECESSARY TO ACTUATE THE MULTIVIBRATOR, SAID INTEGRATOR BEING EFFECTIVE TO INTEGRATE THE SIGNAL TRANSMITTED FROM SAID DETECTION MEANS TO SAID BISTABLE MULTIVIBRATOR WHEREBY VIBRATION HAVING A STEEP WAVEFORM WILL ACTUATE SAID MULTIVIBRATOR, AND ALARM MEANS CONNECTED TO SAID MULTIVIBRATOR FOR BEING ENERGIZED WHEN SAID MULTIVIBRATOR IS ACTUATED.