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Hot-line screen cuts
Page 55
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ice and mist by Ashley Taylor
• A new form of electrically heated bus and coach screen, now ready for launching by Triplex, will be seen on the stands of most of the principal passenger coachbuilders at next month's Commercial Motor Show. The Hot-Line toughened glass screen, to be used for the nearside panel in conjunction with an offside heated panel of Triplex laminated glass, has been designed to provide a mist and frost-free area at least equal to that cleared by the windscreen wipers.
Because, with the dual screens, the elimination of de-misting pipework will be possible, the effective cost of incorporating the Hot-Line panel will be cut by an appreciable amount. It has been evolved with the object of overcoming misting and frosting troubles that are constant sources of complaint in many undertakings.
Heated panels of laminated glass for the driver's side of the two-piece screen have lately been gaining wider acceptance (CM, December 1, 1967), and they are now complemented by the Hot-Line panel which is less expensive to produce. Because of the presence of the heating lines in the glass the Hot-Line system, which has been used previously for car rear windows, is not suitable for placing directly in front of the driver. In this process the heating elements are printed in silver ink by the silk screen method. The application is made on flat glass before firing and any curving that is necessary.
The heated area has been increased from size from 3.8 sq.ft. to 5.6 sq.ft. and the Hot-Line pattern is so placed that it will be equally effective whatever changes are made within the normal range of seating positions for the driver. Briefly, the additional panel ensures that it is possible to obtain a clear view to the nearside as well as forward. The dual system cannot, of course, be employed in the one-piece panoramic, wrap-round screens for which laminated glass has to be used, with heating only on the driver's side.
Because there is a fairly close limit to the power output on buses and coaches care has been taken to keep down the consumption; to this end the Lucas timer switch, with a 15min cycle, is being incorporated. The "on" position will give full power until the system is well warmed-up when it will revert to quarter-power.
In certain vehicles, where sufficient power has not been available to deal with extreme conditions, the operator has installed an additional alternator. At present the Triplex Hot-Line panel is the only windscreen of its type available on the international market.
Following meetings with the Ministry of Transport, certain difficulties that had been raised by local Ministry inspectors have been overcome and the design cleared at national level.