The present invention comprises an audio alarm for providing a back-up acoustic output in response to a sensed parameter including a first audio alarm circuit having a first transducer for providing a first acoustic output in response to the sensed parameter, a second audio alarm circuit having a second transducer which provides the back-up acoustic output in response to a predetermined fault condition, and which is acoustically coupled to the first transducer. The second audio alarm circuit pro...

A swimming pool alarm responsive to wave motion that will produce a signal when two waves exceeding a threshold level of amplitude are sensed within a preset duration of time. A transducer senses air or water pressure changes and produces electrical signals corresponding to the changes. A comparator system, connected to the transducer, receives the transducer signals and, if the signals exceed a preset threshold level, transmits a signal to the discriminator system. The discriminator times the s...

An alarm clock in which, in order to turnoff an alarm, a predetermined number of striking objects must be struck. The striking objects appear and disappear out of and into holes in a top portion of a housing. An effective strike is not generated until the striking object is hit when it is fully extended. The striking objects are not always fully extended because of dummy cams employed along with complete cams for moving the striking objects into and out of the holes. The alarm clock can also be ...

An acoustic sensor and associated electronic circuitry are used to determine when a catastrophic leak (as e.g. may be caused by a sprinkler nozzle being broken off a pipe) occurs in a sprinkling system. When a catastrophic leak is detected, an alarm signal is generated and a shutoff valve may be actuated in order to prevent loss of fluid and possible damage that can occur due to localized high flow of the fluid that is being sprayed. The acoustic sensor responds to a frequency range of acoustic ...

An alarm clock having a case, an alarm signal generator and means for setting and cancelling an alarm circuit, said case being adapted to rest upon a rigid surface by foot means, the latter being capable of movement between two positions and projecting from the base of the case, said foot means being furthermore connected to said setting and cancelling means in such a way that, on the one hand, these latter are actuated by application of pressure to the case and that, on the other hand, the case...

A self contained alarm is arranged to be attached to a door or near a building opening. One version uses a spring loaded switch held open by a door frame, which closes and sounds an audible alarm when the door is opened. A relay with normally open contacts is energized with the alarm to maintain the alarm until a reset switch is opened by a card or key inserted into a mating slot. Another version uses a rotary trip switch which is operated by a line. The line is placed across a building opening ...

A hand held personal alarm incorporating a high intensity light and loud horn and further incorporating a plurality of switches that are located a distance apart that prevents their actuation by the digits of a single hand or by pressing the alarm against a single surface. The switches provide the only means of deactivating the alarm once activated. An alternative embodiment includes a timing circuit that prevents deactivation of the alarm for a set period after activation. Both schemes prevent ...

An alarm system for generating an alarm from a remote location and which utilizes electrically generated codes to access selected functional portions of the alarm system circuitry and which further utilizes a locking transmitter which must be reset after a single use thereof before the transmitter may be re-used, the transmitter resetting being achieved by means accessible only to authorized personnel.

A security alarm system for a vehicle having an alert device, the alert device including an audible alert device, and the security alarm system comprising an intrusion detector for detecting an intrusion event on the vehicle; and an alert controller for controlling the alert device, wherein the alert controller generates an activate instruction to activate the alert device responsive to the intrusion event detected by the intrusion detector and generates a deactivate instruction to deactivate at...

A trailer/cargo alarm detects the proximity of trailer or cargo attached to a vehicle with an alarm system. If the trailer/cargo is moved out of proximity of the vehicle, the alarm system issues an alert. The proximity of the trailer or cargo may be detected, for example, by detecting the presence of the trailer lighting within the vehicle's electrical circuit, by dedicated hardwired sensors, or wireless detection apparatus.