Abstract: A liquid fuel tank for a vehicle is provided with a fuel outlet duct in a circuit about the base of the tank and fuel outlet duct vents connected to the outlet duct and extending above the highest part of the tank. During normal operation of the tank, a non-return air vent allows the flow of fuel from the outlet duct. In the event of an accident, or some other occurrence which results in the tank being tilted, further fuel flow from the outlet duct is cut off by air drawn into the fuel outlet duct from the outlet duct vents. The angle through which the tank must be tilted to allow air from the outlet duct vents to be drawn into the outlet duct may be predetermined by the extent of the circuit about the base of the tank of the outlet duct. Such a non-spill fuel tank, which is self contained in operation, is suitable for use in on-road and off-road wheeled and tracked vehicles, hovercraft, and aircraft which are in danger of being blown over when on the ground.

Abstract: A fuel or other liquid tank for, for example, a motor cycle, comprises a nonreturn vent arranged to vent the tank when the tank is in a generally upright attitude, a filler arranged to admit liquid into the tank below the upper surface thereof, whereby in use an air space remains in the tank at all times, and a pipe for supplying liquid from the tank, said pipe extending from the base of the tank at a first side thereof and terminating as an open-ended vent in the region of the top of the tank opposite said first side, said pipe including a supply portion extending as a branch from a part of the pipe opposite said first side in the region of the base of the tank.

Abstract: A failure warning system for a wheeled vehicle which has an information processor for processing wheel rotation information. The system is applicable to a vehicle having an anti-skid or brake anti-lock device and which also has a bar light speedometer display. The power supply for the display derives from a point in the processor which is live at all times when the processor is functioning normally. Malfunction in the processor which causes loss of processor signal results in a null speedometer reading. A failure warning is thereby provided with a minimum of additional hardware which permits a minimum of difficulty in failure detection in the processor.

Abstract: The invention is concerned with the rapid release of frictional force which is acting to reduce relative movement between contacting surfaces, the normal actuating means being unaffected. One application is in an anti-lock braking system in vehicles, particularly motor-cycles. A sensor monitors wheel angular velocity, calculates deceleration and when this exceeds a predetermined value the sensor causes ultrasonic vibrations to be applied to brake pads effectively reducing friction without release of brake operating pressure to enable resumption of normal rotation. A short duration dc pulse of appreciable magnitude may be applied to the transducer at the onset of the normal input signal to produce a short duration surge to rapidly break the frictional force between the friction member and the moveable member to enhance speed of release.