Patent GB-1002108-A (GB)
Title: Improvements in or relating to steerable vehicles
IPC: B62D7/15
Filed: 1962-09-05
Abstract: 1,002,108. Steering vehicles. GLAVERBEL Ltd. CO. Sept. 5, 1962 [Sept. 11, 1961], No. 34066/62. Heading B7H. A steering arrangement such that the wheels of a trailer or other vehicle all turn about the same centre C comprises at least two wheels 1, 2 each connected to an arm 12, 12<SP>1</SP> of variable effective length the length of which is determined by the points of intersection of straight guide slots 26 and 28 in two mobile steering elements which are moved differently by pin 34 of steering member 32 which engages a bearing 29 in one element and slot 25 in the other, the slots 25, 26 being arranged at a constant characteristic angle m. In the first embodiment the mobile steering elements are plates 17, 18: plate 17 is movable transversely of the vehicle on rollers 19, 20 and plate 18 is guided by lugs 23 on plate 17 to move transversely of plate 17. Pin 34 on crank 33 passes through ball-bearing 29 in plate 18 into slot 25 in plate 17 so that rotation of steering-wheel 32 produces relative movement between plates 17, 18 and the slots 28, 26 and 28<SP>1</SP>, 26<SP>1</SP> move across one another moving the pins 15, 15<SP>1</SP> and the attached blocks 14, 14<SP>1</SP> which slide in the cranks 12, 12<SP>1</SP> and steer the wheels 1 and 2. The characteristic angle m of slot 26 is equal to the angle between the longitudinal axis f, Fig. 8, and the line through the centre of wheel 1 and the point of intersection of the longitudinal axis and the perpendicular to this axis passing through the instantaneous centre of rotation C of the vehicle. When the wheelbases on the opposite sides of the vehicle are different the characteristic angles m, n on the two sides are different. In a second embodiment, Fig. 12, the plate 18 is replaced by two cranked levers 35, 35<SP>1</SP> pivoted to plate 17 at 36 and 36<SP>1</SP> and with slots at both ends engaging the pins 15, 15<SP>1</SP> of cranks 12, 12<SP>1</SP> and pin 34 of the steering crank 33. In a third embodiment, Fig. 18, the movable elements and cranks 12, 12<SP>1</SP> are arranged within a casing 40 connected by shafts 41, 41<SP>1</SP> and 47, 47<SP>1</SP> to the wheels. In the casing (shown in plan in Fig. 19 and side view in Fig. 21) are two members 51 constrained to move longitudinally of the vehicle by slides 21, 21<SP>1</SP> and each comprising two plates 53, 55 with oblique slots 54, 56, the angle between which is the characteristic angle m. Between each pair of plates is a block 52 constrained to move up and down and having a longitudinal slot 57. Rotation of steering-wheel 32 rotates oppositelydirected arms 33, 33<SP>1</SP> with pins 34, 341 at their ends which pass through the slots 54 into the slots 57 in the blocks 52 and hence move the blocks 52. This movement of the blocks is transmitted by the pins 15, 15<SP>1</SP> which pass through the slots 56, 56<SP>1</SP> in the plates and enter the slots 57 to the cranks 12, 12<SP>1</SP> altering their lengths and rotating the shafts 41, 41<SP>1</SP> and thence the steerable wheels. When the invention is applied to a trailer the drawbar comprises the steering member 32.