Pop-up headlamps were introduced in 1937, on the Cord 812. (United States) They were mounted in the front fenders, which were smooth until the lights were activated, aiding aerodynamics when the headlamps were not in use. They also provided a means of fitting a large 7 inch round headlamp into an otherwise pointed front end.
Many (more or less) famous cars used this feature, but no current volume-produced car models use pop-up headlamps, largely because they are expensive to construct. The system requires one or more vacuum-operated servos and reservoirs, with associated plumbing and linkage, or electric lift motors, geartrains and linkages of sufficient robustness and precision to raise the lamps to an exact position each time to assure correct beam aim despite ice, snow and age. Some early pop-up headlamps used a lever-operated mechanical linkage (e.g. Saab Sonett III). Fashions have also changed, and greater priority is given to aerodynamics with lamps off and on, further reducing the attractiveness of pop-up headlamps. In addition, recent ECE Regulations contain stringent standards regarding protuberances on car bodies, in an effort to minimize injury to pedestrians struck by cars.
Hidden headlamps are a variant of a similar concept. In cars with hidden headlamps, panels designed to blend in with the front styling of the car (e.g. adjacent fender and/or grille) cover the headlamps when they are switched off. When the lamps are switched on, the cover doors are swung out of the way, usually downward or upward and into the space within the fender above or below the headlamps. Actuation of the cover door mechanism may be by means of vacuum pots (as in the 1967-1969 Mercury Cougar) or an electric motor.[/i]
Ook bij Triumph in het VK werd gewerkt met dit idee: het prototype ‘Fury’ was uitgerust met klaplichten:
[i]The Fury was Triumph’s first monocoque sports car, built to fill a gap between the TR4/5 and the Spitfire. Styled by Michelotti of Italy, it was powered by a tuned Triumph 2000 straight-six engine and featured independent rear suspension and a futuristic pop-up-headlight nose treatment. The back end had a chopped-off look, a style that would become a Triumph trademark in the later ’60s.
Rather than produce the open-topped Fury, Triumph decided to give the fastback GT6 the go-ahead, but the Fury prototype still exists in private hands.[/i]
De wagen is hier te bekijken.