Ultrasonic signal generating device

Details Ultrasonic signal generating device Ultrasonic signal generating device

1977-11-16

1979-03-06

Swisher, S. Clement

Signals and indicators

Horns, whistles and compressional wave generators

116169, B06B 110

Patent

active

041424786

ABSTRACT:
An improved device for generating an ultrasonic signal for use in an area protected by an alarm actuated by an ultrasonic signal. The device includes a tuned, acoustic rod within a cylinder typically about the size of a pen adapted to be worn in a shirt pocket. The device has a spring-actuated hammer which is movable, when triggered, into engagement with the rod to generate an acoustic signal. When the hammer is cocked, it is held in a cocked position by two spaced triggers which must be actuated simultaneously to release the hammer to cause it to move toward and to strike the rod. The cylinder has an opening for indicating the fact that the hammer has been triggered. The device is made so that it cannot be re-cocked without special equipment not available to the public.

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patent: 1100846 (1914-06-01), Rombaugh
patent: 2821955 (1958-02-01), Ehlers
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patent: 2845697 (1958-08-01), Adler
patent: 2920604 (1960-01-01), McDonald
patent: 3028832 (1962-04-01), Lazzery
patent: 3077856 (1963-02-01), Rieth
patent: 3165090 (1965-01-01), Smith
patent: 3189000 (1965-06-01), Salners
patent: 3750131 (1973-07-01), Fletcher

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