초록 ▼

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 w

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.

대표청구항 ▼

For use in remote actuation of apparatus, a miniature wireless radio transmitter unit comprising: a housing of a size wearable on the wrist of a user and containing a radio transmitter, antenna, and manually actuable button switch within the housing; a resilient membrane sealed to an opening in the

For use in remote actuation of apparatus, a miniature wireless radio transmitter unit comprising: a housing of a size wearable on the wrist of a user and containing a radio transmitter, antenna, and manually actuable button switch within the housing; a resilient membrane sealed to an opening in the front face of the housing and in confronting relation to the button switch and deformable in response to finger pressure to cause actuation of the button switch; at least one elongated narrow passage in the housing in communication at one end with a vent hole through a face of the housing, and in communication at the other end with the atmosphere; the passage being operative to provide equalization of air pressure between the housing interior and the atmosphere and isolation of the housing interior from entry of liquid; said resilient membrane includes a central portion configured to fit within the opening in the front wall of the housing and a peripheral portion configured to fit within a flange of the housing which is in surrounding spaced relation to the opening; and a frame secured to the flange and operative to compress the peripheral portion of the membrane into sealing engagement with confronting surfaces of the housing.