Intraplant communication system
First Claim
1. A telephone communication system including a station connected thereto comprising two relatively movable elements, namely a handset and a hang-up support for said handset, said handset having an audio receiver in one end and a microphone in the other, said handset and hang-up support containing means devoid of movable switching contacts for proximity detection of movement of said handset relative to said hang-up support, said means comprising a proximity radio frequency transmitter contained in the handset, and a proximity receiving antenna contained in the hang up support, and disconnect relay means activated by a proximity detector responsive to said proximity radio frequency transmitter upon movement of said handset to close proximity to said hang-up support, even without hanging said handset thereon, so as to effect electrical disconnection of said handset from said system and so that movement of said handset away from said hang-up support will effect electrical connection of said handset to said system.
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Accused Products
Abstract
This invention is an improvement of the intraplant communication system in U.S. Pat. No. 3,527,890. It comprises one base unit composed of a handset amplifier and speaker amplifier, each with its own integral power supply and each located on a common printed circuit board. This unit also features a disconnect device, formerly called a hook switch, which includes a radio frequency proximity detector which has no moving parts.
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Citations
7 Claims
- 1. A telephone communication system including a station connected thereto comprising two relatively movable elements, namely a handset and a hang-up support for said handset, said handset having an audio receiver in one end and a microphone in the other, said handset and hang-up support containing means devoid of movable switching contacts for proximity detection of movement of said handset relative to said hang-up support, said means comprising a proximity radio frequency transmitter contained in the handset, and a proximity receiving antenna contained in the hang up support, and disconnect relay means activated by a proximity detector responsive to said proximity radio frequency transmitter upon movement of said handset to close proximity to said hang-up support, even without hanging said handset thereon, so as to effect electrical disconnection of said handset from said system and so that movement of said handset away from said hang-up support will effect electrical connection of said handset to said system.
Specification