Abstract: A reverberation sound generator is provided for use as a warning generator for giving a warning to the driver of an automobile, for example. The reverberation sound generator has a capacitor connected in series with a power supply, a pair of diodes and a pair of resistors connected in series with the capacitor, and a sound generator circuit connected between the pair of diodes and the pair of resistors. A sound generation command switch is joined in series with the diodes and resistors. There is a circuit for discharging the capacitor. The capacitor can be controlled in its charging and discharging in response to closing and opening of the sound generation switch. When the capacitor is charged and discharged, the sound generator circuit produces reverberation sounds, respectively.

Abstract: A locking and unlocking device comprises an electromagnetic actuator which pulls in or pushes out an output rod thereof, a movement direction changing mechanism alternating the direction of its rotational movement with each of said pulling-in and pushing-out operations of said electromagnetic actuator, a lock lever rocking alternately in opposite directions with each of said pulling-in and pushing-out operations of said electromagnetic actuator, a main body of a locking apparatus linked with said lock lever and effecting locking and unlocking operations, position detector switch means linked with a moving part of said main body of said locking apparatus thereby being caused to change over with each of said locking and unlocking operations to control energization of said electromagnetic actuator, and operation switch means for initiating said locking and unlocking operations, respectively. The changing-over of said position detector switch means determines which operation switch means is subsequently operable.

Abstract: A deceleration indicating system wherein when the deceleration of a running vehicle exceeds a specified value, an emergency deceleration indication is made externally which is different from that deceleration indication which is made when the deceleration of the vehicle is lower than the specified value. The drivers of other vehicles in the vicinity of and behind this vehicle can discriminate according to the deceleration indication of the vehicle whether its deceleration is of a normal kind or emergency kind. This emergency deceleration indication is returned to the normal indication in response to the operation of a manual switch, accelerator pedal or brake pedal.

Abstract: There is provided an automatic seat belt locking system for a vehicle, e.g., an automobile whereby while in the normal condition the vehicle occupants are not restrained by their seat belts, the seat belts are automatically locked to secure and protect the occupants in the case of an emergency such as a collision. The system comprises a pair of acceleration/deceleration detectors which are composed for example of two different types of mercury switches and which are also adapted to respectively generate a first and second output signal when the acceleration or deceleration of the vehicle exceeds a first and second predetermined value, and absorbing means whereby transient accelerations greater than the first predetermined value and caused by disturbances are absorbed to render both of the detectors inoperative while the vehicle is running on an incomplete, rough road surface.