Sale computing and display package for gasoline-dispensing apparatus

摘要

Sale computing and display apparatus for gasoline-dispensing equipment utilizing a rotatable shaft for metering the amount of gasoline dispensed and a unit price adjusting mechanism cooperating with the rotatable shaft for providing the sale price of gasoline being dispensed as a function of the rotation of the shaft; a pulser responsive to the unit price adjusting mechanism and the rotations of the shaft for providing pulses representative at least of the sale price of the gasoline being dispensed; at least one sale display device, including a light-transmissive liquid crystal display panel, having a planar viewing surface and utilizing a prism for back-lighting the display panel; electronic logic for receiving the pulses, computing the sale and supplying signals for actuating the display panel; and electrical safeguards complying with the requirements for intrinsic safety. The display panel is resistively heated and includes a light-diffusing sheet and a blue-light neutralizing sheet. An auxiliary bar graph of sequentially lighted points of light is correlated with the advancing total of the sale, the lights each representing two cents of sales through ten cents and repeating as the total reflected by the display panel increases. The apparatus has particular utility for replacement of outmoded mechanical devices in existing gasoline pumps.