Ericofon

The Ericofon is a Swedish telephone handset created by Ericsson. It was designed in the late 1940s by a design team including Gösta Thames, Ralph Lysell and Hugo Blomberg. A specific feature of the telephone is that the two major components--the handset and the dial--are combined in a single unit. This one-piece design anticipated the evolution of the typical cordless phone and cell phone by several decades. The Ericofon is considered a landmark in plastic industrial design. The serial production began in 1954. The earlier models were only sold to institutions, but in 1956 production for the open market begun in Europe and Australia. In Sweden it is known as the "cobra telephone", due to its similarity with the serpent.

Bell Telephone Laboratories would initially not allow the introduction of the Ericofon to USA, but it soon became a best selling model. When it was introduced on the USA market, it was available in 18 different colors, but after subsequent transfer of the production to North Electric, the number of colors was reduced to eight.

Most of the Ericofons made had mechanical rotary dials, typical of all phones made in that era. While Ericofons produced by Ericsson used miniature buzzers as their ringers, North Electric introduced the electronic "Ericotone" ringer in its Ericofons. The Ericotone ringer used a simple, 1-transistor oscillator circuit to produce a "chirping" sound to serve as the phone's ringer. This was one of the earliest applications of a transistor in a telephone, as telephones with mechanical bell ringers and rotary dials did not need transistors. North Electric also introduced a touch-tone version of the Ericofon in the United States in 1967, but this variant was not produced in the numbers that the rotary dial version was. The touch-tone version has also become rarer over time as a design flaw in the hookswitch mechanism can cause the phone to become unusable if it is set down too forcibly. North Electric ceased production of the Ericofon for North America in 1972.

Ericsson also introduced a push-button version of the Ericofon, the model 700, for the company's 100th anniversary in 1976. The model 700 had a squarer design but it was not touch-tone. Instead, its electronics transmitted electrical pulses as its buttons were pressed, mimicking the pulses produced by a rotary dial. Ericsson also continued to produce rotary-dial Ericofons until about 1980.

ee also

* Trimphone - another telephone from a similar era
* Trimline - AT&T's answer to the Ericofon, the Trimline phone incorporated a dial into the handset, but still had a separate cradle containing the ringer.
* Grillo - Another innovate telephone, from Italy. Its design anticipated the cellular "flip-phone."

External links

*http://www.ericofon.com/
* [http://www.moma.org/collection/browse_results.php?object_id=1151 Ericofon at the Museum of Modern Art]