Patent GB-236562-A (GB)
Title: Improvements in means for and method of lighting motor vehicles
IPC: B60Q1/14
Filed: 1925-07-01
Abstract: 236,562. Chambers, K. D. July 1, 1924, [Convention date]. Lighting, systems of; vehicle lamps; lantern screens.-In order to obviate dazzle, each land or sea vehicle is provided with means for projecting light having a predominant colour, and with means mounted on the vehicle for screening the driver's eyes from light having any other predominant colour whilst not materially interfereing with the transmission of light of the same predominant colour as that emitted by the lamps of the vehicle, so that, by causing each vehicle to use a different kind of light, the driver will bo protected from blinding by light from another vehicle. Light of a definite wave-length may be obtained by filters, prisms, &c., or a combination of these, or by the use of luminouns gases or solids giving off coloured lights. Preferably each vehicle is provided with means for projecting two kinds of light and with two eye-protecting devices, and both the projecting and protecting devices may be moved by electric means controlled by hand or by means of a magnetic compass. In one form, the vehicle lamps may be provided with a cylindrical filter operated through a lever 8, Fig. 13 connected to the armatures 10, 11 of solenoids 12, 13 and by a link 7 to parallel rods 5 carrying the filter so that either the green or the red part of the filter may be brought between the reflector and the light source. In a second form, red and green slats mounted in pairs on pivots at right-angles to each other are arranged in front of the light source so that either colour slats may be brought into the vertical position by sliding a vertical bar. The solenoids 12, 13, Fig. 5, for operating the cylindrical filters are in parallel with the solenoids 47, 48 for operating the screens for the drivers' eyes, and are controlled by a hand-operated or automatically-operated switch 58a, the levers 42, 8 being connected to earth. The switch may be controlled by means of a gimbal-mounted magnetic compass preferably mounted on the underside of the roof or cover of the car. A disc 75, Fig. 7, carried by the compass needle is provided with a non- magnetic metal bridgepiece 76 and a counterweight 77 so as to complete the circuit between a ring 78 and one or other of two half rings 79 connected acording to the position of the needle to one or other of two magnets 87, 88, Fig. 5, the armature 89 of which is connected to the storage battery and closes the circuit through one or other of the switch-operating solenoids 91, 92. An intermittent current of sufficient strength to pass through the bridge-piece to the half rings 79 is supplied from the storage battery by means of a commutator 82 rotated by a motor 81 through a spark coil 85 to the ring 78. The Specification as open to inspection under Sect. 91 (3) (a) also states that the screening means may be adjustably mounted on spectacles worn by the driver instead of being mounted on the vehicle and that, instead of projecting light having a predominant colour, polarized light may be employed, the polarization being effected in some cases by reflection, or by reflection and refraction. This subject-matter does not appear in the Specification as accepted.