1959 - History of Ericsson - History of Ericsson

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Fig. 12 X8134 Instrument with base plate in form of a tray Fig. 13 X 2404 Later deiclopment of sketch in fig. 12 Fig. 14 X7747 Last in the series came more concrete forms of cardboard or plasticine models 114 to the flat top of the pyramid. This gave the push-button set a more stable position in the general structure and allowed the instrument to be manipulated from all sides with greater ease. At a later stage (fig. 13) the positions of the microphone sound outlet and push-button set were interchanged. The usual manipulation of the buttons would, of course, be from the front. In the final design the line button (the left-hand button) is differently marked from the two other buttons. The centre button regulates the volume. The right-hand button is a secrecv button. The more concrete shapes of cardboard model were superseded by a plasticine model (fig. 14). The latter was used as the basis for drawings of a wooden pattern which was made by hand (fig. 16). A heated thermoplastic sheet was then pressed over the pattern, using a vacuum-forming process known as draping (fig. 17). The resulting case was dressed off, and slots for
Fig. 15 X 2405 Sketch of the wooden pattern Fig. 16 X 2403 Preparation of the wooden pattern over which the thermoplastic case is pressed Fig. 17 Wooden pattern and thermoplastic case pressed from it x 8137 the microphone and loudspeaker were cut out (fig. 18). The tray-shaped base was made of a thermoplastic material by the same method. The dial and other external parts were selected from the standard colour range to match the desired light grey case. The standard push-buttons could be used unmodified. The drawing of the final prototype for industrial production is shown in fig. 19 and the finished Ericovox with Ericofon in fig. 20. lis
Page 1: 4 1959
Page 4 and 5: Ericovox, the One-Piece Loudspeakin
Page 6 and 7: Fig. 3 X 8156 Block schematic of co
Page 8 and 9: Fig. 5 x 8163 The Ericovox, L M Eri
Page 10 and 11: Fig. 8 X 2443 Sending frequency res
Page 12 and 13: 108 The Ericovox meets the requirem
Page 14 and 15: Fig. 3 Grouping of components in wi
Page 16 and 17: Fig. 9 X 8132 Case with pyramid-sha
Page 20 and 21: Fig. 18 X8135 The locations of the
Page 22 and 23: Gothenburg Automatic Transit Exchan
Page 24 and 25: Fig. 3 x 8181 Block schematic of gr
Page 26 and 27: Fig. 6 122 x 8180 Block schematic o
Page 28 and 29: Fig. 8 X 2472 Link circuits for ori
Page 30 and 31: Fig. 10 X8182 Traffic supervisor's
Page 32 and 33: Fig. 2 X8167 Relay switchboard AMD
Page 34 and 35: 130 Priority The switchboard is des
Page 36 and 37: Crossbar Exchange Installed on Larg
Page 38 and 39: L M Ericsson to Undertake First C.T
Page 40: The Ericsson Group Associated and c

1959 - History of Ericsson - History of Ericsson

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