Patent GB-465225-A (GB)
Title: Improvements in or relating to light projectors particularly, for motor vehicle head lamps
IPC: B60Q1/14
Filed: 1936-04-25
Abstract: 465,225. Vehicle &c. lamps. DESPATURES, C. F. April 25, 1936, No. 11841. Convention date, July 12, 1935. [Classes 75 (ii) and 75 (iv)] In a vehicle lamp a substantially paraboloidal reflector is divided horizontally into two parts and means are provided for relative sliding of the two parts longitudinally and for dipping the two parts together. Means may also be provided for relative swivelling of the two parts about a substantially vertical pivot. The light source may comprise a double filament electric light bulb with change-over switching means connected to the means for operating the parts of the reflector, or it may comprise a slidably mounted single filament bulb. In the form shown in Figs. 2 and 3, the upper half reflector 3 is reinforced by ribs 5 ... 8 and a horizontal flange 9, whilst the lower half 4 is reinforced by ribs 10 ... 13 and a horizontal flange 14, the two flanges being connected together by a bolt 21. The upper half 3 is attached to a flange 16 inside the lamp casing 1 by means of a horizontal row of helical springs 15 which serve as a hinge and urge the rear part of flange 9 against a cross-piece 17 fixed in the casing 1. The flange 14 is formed with two or more depressions 22, 23 which are circular about the bolt 21 as centre and which accommodate balls 24, 25 bearing on the flange 9. The reflector halves 3, 4 are drawn together by means of a helical spring 26, which also serves to return the half 4 to its normal forward position, the spring 26 engaging in holes in an arm 27 secured to rib 6 and in holes in an edge piece 28 on the flange 14. The reflector parts are operated from the driver's seat by means of a cable 43 attached to the lower part 4. The weaker spring 26 yields first and the part 4 pivots about the bolt 21 and moves rearwardly until a stop 44 engages an adjustable screw stop 45 on the part 3. The two parts 3, 4 are then dipped together against the action of the stronger springs 15. The cable 43 is attached to a disc 34, Fig. 7, which is rotated by a lever 33 until a pin 36 on a spring controlled lever 37 engages in a notch 35 in the edge of the disc. A part 39 projecting from the disc 34 normally holds a spring-urged bell-crank lever 40 on a contact 41 connected to the filament 29 for normal driving. Rotation of the disc 34 brings lever 40 on to a contact 42 connected to the filament 30 which is used when passing other vehicles. The bulb is provided internally or externally with a screen for cutting off the upward direct rays which do not fall on the reflector. In the form shown in Fig. 12, the part 4 is attached to a flange 49 by tension springs 50, whilst the rear of the flange 14 is formed with a pair of straight depressions 51 and is extended rearwardly to rest on a cam 52. The latter is rotated by a knurled knob 53 having locating holes 54 to engage a spring- pressed ball. A bulb with a single filament 56 slides in a tube 58 fixed to the reflector part 3, the holder being attached to a cross-bar 59 which is urged rearwardly by two springs 60. For normal driving, the bar 59 is located against a stop 61 on the flange 91, but as the part 4 is moved forwards, when passing other vehicles, a stop 62 on flange 14 presses the bar and the bulb forwards. The cable and cam operating means may be replaced by electromagnets, electric motors, fluid pressure, or like means, and a pair of lamps may be operated together simultaneously.