A pressurized container fitted with a fusible plug and containing a suitable propellent with a vapor operated sounding alarm attached is constructed as a selfcontained sounding device that produces its sound when subjected to heat sufficient to cause the fusible plug to melt permitting the propellent to escape through the alarm attached to the container.

An alarm clock having a removable throwable alarm.

A system for sounding an alarm when an unauthorized person or unidentified object enters a swimming pool. The system employs a float containing a battery powered transmitter tuned to a selected fixed frequency. The transmitter is energized when the person or object enters the water whereby a signal at said frequency is transmitted. A receiver tuned to the same signal acts as a monitor by receiving the signal and reproducing same in form suitable for sounding the alarm.

An alarm device in which an oscillator controls the condition of actuating means for a signalling device which provides an alarm signal when the frequency of the oscillator is changed, the device including a conductive suspending handle electrically connected to the oscillator for (a) suspending the device from a conductive doorknob of a door and (b) electrically connecting the oscillator to the doorknob, and a balancer plate for the oscillator to capacitively couple a reference portion of the o...

An alarm system includes an electrical energy source; an alarm for producing an alarm signal when electrically coupled to the electrical energy source; a switch for movement from a first position to a second position upon the occurrence of the monitored event; and timing circuitry for being activated when the switch is moved from the first position to the second position, for electrically coupling the alarm to the electrical energy source, for continuing to electrically couple the alarm to the s...

An alarm apparatus includes an electric conductor disposed at a window pane, a voltage supply device that supplies a voltage to the electric conductor, a voltage detection device that detects the voltage of the electric conductor, a disconnection determination device that makes a determination regarding a disconnected state of the electric conductor based on the detected voltage of the electric conductor, an alarm determination device that determines whether or not to perform alarming based on a...

The present invention is a device designed to sound an alarm when it is removed from an electrical outlet. The device is plugged into an electrical outlet using a set of prongs like those used in the electrical plugs of typical household appliances. When the device is in its activated state, its being removed from the outlet will cause an alarm to sound, thereby alerting persons in the area. The apparatus is battery-powered, and does not form a circuit with the outlet into which it is inserted.

A fire alarm for an installation via a housing that is flush with the ceiling, having at least one light source arranged in the housing and at least one light receiver arranged in the housing, as well as a shutter disk, which seals the housing. To prevent the spreading of stray light between the light source and the light receiver via the shutter disk, a shield, for example, is provided in the shutter disk to suppress or absorb stray light.

A mobile communication terminal comprising: a clock for maintaining an indication of the current time; a memory for storing a definition of an alert time; and an alerting unit configurable to issue an alert when the current time matches the alert time, the alerting unit being capable of issuing the alert by initiating a connection to another communication terminal over a network so as to cause that other terminal to locally signal the incidence of the connection incoming thereto.

A reversing alarm for a vehicle emits an audible signal in the form of pulses of broad band sound when the vehicle is put into reverse gear. The broad band sound allows persons in the vicinity to locate the vehicle, as the human brain is able to process broad band sound to pinpoint the location of the sound source in a way which is not possible with single tone sounds. The alarm is implemented via a simple electronic circuit which uses a zener diode as a signal generator 20 to generate the broad...