Patent GB-1324602-A (GB)
Title: Selective gear arrangement in a motor fuel dispensing apparatus
IPC: B67D7/74
Filed: 1970-08-14
Abstract: 1324602 Dispensing Liquids: SUN OIL Co 14 Aug 1970 [18 Aug 1969] 39237/70 Heading A4T [Also in Divisions F2,G4] A multigrade petrol dispensing apparatus is operated by pushing a single button 58 or 58<SP>1</SP> to 65 or 65<SP>1</SP> Fig. 2 corresponding to the desired grade and can be set to deliver a predetermined value of fuel or to fill a vehicle tank. In Fig.1 pipe connections are shown as double lines, mechanical connections used in resetting and adjustment cycles in dotted lines and mechanical connection for actual dispensing in a single solid line. Lo and Hi pumps 2, 11 driven by a motor 3 deliver to a blend valve 19 through Lo and Hi meters 8, 16 and thence to a nozzle having spaced electrodes, to ensure insertion in a tank before delivery can start, such as described in patent No. 1278300. The nozzle includes a vacuum pipe 22 which is supplied by a pump 23 to withdraw the vapour and return it to the supply tanks and is controlled by a vacuum switch 25 which is opened when the vehicle tank is full to stop further delivery. The Lo and Hi meters operate a total gallons register 31 through a summing- type differential which also through a price increment unit 36 operate a cost counter dependant upon the grade selected. Other outputs 41, 43 of the Lo and Hi meters go to the Lo and Hi gears boxes, (Division F2) which through a subtractive differential 49 control the blend valves to maintain delivery of the correct blend. A reset motor 54 initially when a blend button is operated, sets the gallons and cost counter to zero and sets the Lo and Hi gear boxes to produce the right blend setting of the valve 19 and sets the price increment unit 36 so that the correct price for that grade is subsequently registered. If dispensing continues until the vehicle tank is full it is quickly terminated when interruption of the vacuum pipe opens the vacuum switch which has the effect of closing both valves in the blend control valve 19 rapidly. An off cycle of the reset motor is also initiated during which all the gears in boxes 42, 44 are disengaged and locked in the out of mesh position and the price increment unit 36 is set to its reference off position. The total gallons and cost counter register 31 records the gallons dispensed and their cost in a conventional manner but is provided with resetting means by which a desired sum can be set and dispensing will be stopped when the corresponding quantity of fuel of the grade selected has been delivered. The counter is set to the desired sum and dispensing started. Resetting of the counter to zero is controlled by reed switches one of which provides a pulse to a stepper coil each time a 9 is displayed on the ten cents wheel thus stepping back the counter after 90c, 190c etc worth of fuel has been dispensed. When the 1 dollar step is passed another switch is closed after a further 98c have passed which de-energizes a relay so that the dispensing operating solenoid moves the blend control valve to a partially closed position allowing slow dispensing to continue until the ten cents wheel zero actuates a final switch to completely stop dispensing when the desired amount has been delivered. A remote counter to indicate the cost dispensed may be provided and is fed with cent pulses from the counter 31.