Portable transmitter for emergency alarm system having watertigh

Details Portable transmitter for emergency alarm system having watertigh Portable transmitter for emergency alarm system having watertigh

1982-12-30

1985-01-01

Ng, Jin F.

Telecommunications

Transmitter

Mobile or portable

455128, H04B 1034

Patent

active

044919700

ABSTRACT:
The present invention provides a small portable radio transmitter unit which can be worn on the wrist or suspended from a neck chain to provide immediate access in the event of an emergency condition and without interfering with the normal day-to-day activities of the wearer. The unit is contained within a watertight housing having a resilient membrane depressible by finger pressure to actuate a button switch within the housing for actuation of the transmitter. The housing is vented to the atmosphere to provide equalization of internal and ambient pressure in a manner providing isolation from water or other liquid entry to thereby maintain a watertight enclosure.

REFERENCES:
patent: 3032651 (1962-05-01), Gisiger-Stahli et al.
patent: 3289085 (1966-11-01), Leland
patent: 4121160 (1978-10-01), Cataldo

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