Patent GB-328912-A (GB)
Title: Improvements in and relating to head lamps of the dipping type for motor vehicles
IPC: B60Q1/14
Filed: 1928-11-06
Abstract: 328,912. Birtwisle, W. Nov. 6, 1928. Vehicle lamps, directing. - A vehicle headlamp is so mounted in solid bearings that, without change of setting, and at the will of the driver, the beam of light can be projected to the left and downwardly only, and also to the right and downwardly only, controlled movement about one axis directly causing movement about a second axis at an angle to the first axis. In the form shown, as applied to the reflector, the front portion 6 of the reflector is held stationary in the lamp casing 1 by means of resilient members 6a, whilst an annular flange 8 formed integrally with or secured to the forward edge of the rear portion 7 of the rerflector is mounted on horizontal pivots 9 within an annular metal ring 10 which is mounted on vertical pivots 11 on the front portion 6. A Bowden wire 13 is secured to the ring 10 by means of a guide 14 and a spring 16 under tension is connected to the guide 14 and to the rear portion 7. On releasing the Bowden wire the spring 16 rotates the ring 10 and rear portion 7 about the pivots 11. At the same time the flange 8 contacts with one of a pair of abutments 12 fixed to the front portion 6 or to the lamp casing, and the portion 7 is rotated about the pivots 9 against the action of a spring 15 and the beam is directed downwardly and to the left. A pull on the Bowden wire will likewise direct the beam downwardly and to the right. The light source may be carried by the rear portion 7, the front portion 6, or the lamp casing 1. Alternatively, the ring 10 could be mounted in a race with ball or other anti-friction bearings and given an angular motion to set the axis of the pivots 9 at any desired inclination to the horizontal, the reflector carrying a cam to co-operate with a fixed stop on the lamp casing for the purpose of dipping the reflector. In modifications which are described and illustrated in the Specification, (i) one side of the rear portion of the reflector is mounted on a ball or like bearing adapted to permit of universal movement, whilst the other side is provided with a pin guided in an axial slot in the front portion, the desired movements of the reflector being obtained by rotating a transversely arranged cam-member in a clockwise or anti-clockwise direction; (ii) the cammember is replaced by a T-shaped operating member and a spring-biassed tumbler lever; and (iii) the movement of the reflector about the two axes is not simultaneous, the beam being first of all dipped and then swivelled either to the left or right. In a still further modification, the lamp casing is rotatably mounted on a vertical bracket, the upper end of which passes into the lamp casing and engages the rear of a pivotallymounted reflector so as to dip the reflector when it is swivelled laterally with the lamp casing, a cam preferably being disposed between the reflector and the upper end of the bracket. The Bowden wire and return spring may be replaced by a more or less rigid wire or rod whereby a push as well as a pull may be everted on the movable part, or by pneumatic or hydraulic mechanism. The second Provisional Specification refers to the use of two control wires, whilst the third Provisional Specification refers to the use of two slotted bearings.