Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering
Patent
1991-12-26
1993-02-16
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Underwater system
Telemetering
367142, H04B 1100
Patent
active
051876914
ABSTRACT:
A signaling apparatus for generating an audible sound includes a housing containing a cylindrical chamber having two ends, an end member secured over each end, and a projectile member contained within the cylindrical chamber. The projectile member preferably has an outer diameter slightly smaller than the inner diameter of the cylindrical chamber, for limiting lateral movement of the projectile member. The end members form a water-tight seal with the housing to keep moisture out of the cylindrical chamber. The projectile member is preferably a metal ball. The end members have outer surfaces and optionally include a loop attached to the outer surface of one of the end members for receiving a cord. The housing, including the end members, is preferably made of PVC, brightly colored and fluorescent so that the apparatus can be more readily seen in murky water. A foam sleeve is preferably provided over the housing for improving the grip of a person holding the device. This foam sleeve is preferably brightly colored and florescent so that the apparatus can be more readily seen in murky water. A method of signaling a person with the above-described apparatus includes the step of shaking the apparatus back and forth generally along its longitudinal axis so that the projectile member within the cylindrical chamber strikes the end members.
REFERENCES:
patent: 3562451 (1971-02-01), Mullen, Jr. et al.
patent: 3906884 (1974-03-01), Gould
patent: 4509151 (1985-04-01), Anderson
patent: 4635242 (1987-01-01), Hart
patent: 5047990 (1991-09-01), Gafos et al.
Ammann Donald
Oehme William J.
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