Vehicle deceleration rate indicator - uses mercury globule moving in sealed sloping tube to touch contacts and activate electric lamp circuits

摘要

The rate of acceleration or deceleration of a motor vehicle is indicated to the driver of a following vehicle by a system of lights on the rear of the vehicle. This prevents the following drives from taking dangerous braking action when relying only on vehicle stop lights. A mobile weight (1) comprising a mercury globule moves by inertia in a sealed tube (2) mounted in a polystyrene block (3). A spirit level (4) permits adjustment wrt the horizontal plane. During deceleration the mercury globule is projected along the tube to a level determined by the rate of deceleration rate. Contacts (9, 10, 11, 12) are made to successively cause the lamps (19, 20, 21) to illuminate. A conventional stop lamp (24) is also included.