GB1241030A - Device for testing the vigilance of a person - Google Patents

Abstract

1,241,030. Vigilance testing devices. BIVIATOR S.A. 12 Nov., 1968 [20 Nov., 1967; 11 Jan., 1968], No. 53505/68. Heading A5K. A device for testing a person's vigilance comprises a plurality of simultaneously and independently operable luminous indicators, at least two energy sources adapted to individually operate separate ones of the indicators at different luminosities or frequencies of variation of luminosity, thereby allowing comparison of two or more indicators whereof the luminosity of at least one indicator varies at a frequency within the person's flicker fusion threshold range, which frequency may be continuously adjustable within said range for said one indicator. A vehicle driver testing device comprises a row of seven luminous indicators 1 to 7, and associated interlocked test switches 1c to 7c which are interconnected with a commutator unit so that, when a test switch 10 is closed, one indicator is chosen in a random manner to flicker and the others are connected to a d.c. supply. If the driver has sufficient vigilance he will pick out the flickering indicator and may press the handle operable switch from the set 1b to 7b, associated one with each indicator, associated with the flickering indicator to complete the ignition circuit of the vehicle to enable it to be started. At the end of a relatively short time switch 10 is automatically opened to break the ignition circuit unless the appropriate switch 1b to 7b has been previously operated to complete the circuit and supply current to a holding coil 12 of a shorting switch 11 for switch 10. A second vehicle driver testing device, Fig. 2 (not shown) comprises a luminous indicator (22) driven by a generator (26), preset to a certain frequency, and a second luminous indicator (23) alongside the first driven by a generator (28) having a scale (25) attached to a potentiometer for adjusting its frequency. To start the vehicle an ignition switch (42) is first closed and if the driver has the required level of vigilance he may adjust the frequency of flickering of the second indicator (23) to match that of first indicator (22). The frequencies are compared by a comparator (29) which when they are equal actuates interlocking circuitry which enables the car to be started if the driver has a level of vigilance such that he is able to join a movable contact (40) to a fixed (39), and hence complete a circuit, by passing the movable contact (40) vertically between two contact bars (41) without touching either of them with contact (40). The interlocking circuitry also prevents starting of the car if the frequencies of the indicators are not first matched before the contacts (39) and (40) are joined in the manner described above.