Patent GB-955401-A (GB)
Title: Improvements in or relating to liquid measuring and dispensing apparatus
Inventor: WILSON FREDERICK EDWARD JOHN
IPC: B67D7/74
Filed: 1962-02-14
Abstract: 955,401. Dispensing petrol and oil. AVERY-HARDOLL Ltd. Feb. 12, 1963 [Feb. 14, 1962], No. 5702/62. Heading A4T. In a liquid mixture measuring and dispensing apparatus an electric motor 28, Fig. 2 drives pump 23 extracting oil from a tank 22 and delivering it via a changeover valve 61 to either the delivery side or the lower pressurised side of a piston 43 in a cylinder 27 dispensing oil via a manual stop valve 33, sight glass 35, and mixing chamber 36 leading to the nozzle 38. The motor also drives a pump 24 delivering petrol via gas separator 25, rotary displacement meter 26, a stop valve similar to 33 and sight glass 34 to the mixing chamber 36. The output from the rotary meter at 51, Fig. 4 and the upward movement of the oil piston rack 45 via gear 46, chain 48 and clutch wheel 50 are fed into a differential 53 which drives the register 29 and two 90 degrees phased twolobed cams 74, 75 which alternately lift arms 65, 66, Figs. 2 and 6, carrying pawls 67, 68 engaging cam teeth in corresponding wheels of two groups of wheels 62a, 62b whereby the oil piston moves upwards in steps. To begin dispensing, crank lever 69, 69a is slightly rotated to lift the pawls 67, 68 and arms 65, 66 clear of their respective cams and is then slid along rod 64 to position the pawls over a selected pair of cam wheels 62 to determine the ratio of oil to petrol which is indicated at a window of the pump housing. On lifting nozzle 38 a switch lever 41 is raised to release the latch on the register zeroising mechanism via switch lever fork 111 and levers 112, 113, Figs. 4 and 9, to move a lever 137 via abutments 139, 141, Fig. 9 to cause cam 134 to engage clutch 78 connecting cams 74, 75 to the differential output at 57, and also to move a link 109, Fig. 9 to partially free the latch 108 acting on the stop valve lever 39. Lever 41 also closes motor switch 42 via abutment 87 on rod 86, cranks 88, 91 and spaced abutments about 91 on rod 92, opens an oil delivery bleed valve 84, Fig. 2 via a rod abutment 121, arm 119 and hooked pawl 122 engaging the valve stem, and moves changeover valve 61 to direct the oil pump delivery to the dispensing end of cylinder 27. Since the stop valves 33 are closed the pumped petrol and oil flow back to their supply tanks via by-pass valves and bleed valve 84. The register is zeroised by knob 115 which also rotates cam 116 to release detent 117 and freelatch 108 whereby lever 39 may be moved downwardly to open the shut off valves 33 and at the same time trip pawl 122 to close bleed valve 84. When the required quantity has been delivered as indicated by the register, lever 39 is moved upwardly to close the shut off valves and the switch lever 41 moves down to its off position, a latch 145 dropping automatically into engagement to prevent the switch lever being lifted again, latch 108 re-engaging lever 39 and latch 113 reengaging the zeroising mechanism. Movement of lever 41 also moves cam 134 to declutch cams 74, 75 from the output of the differential 53 and then picks up link 142 and rotates cams 74, 75 to a predetermined position and reserves the changeover valve 61 via rod 86, abutment 104 and lever 102 and resets pawl 122 for reopening of the bleed valve when the lever 41 is next raised. Pressure from the oil pump which is still being driven by motor 28, begins to move the oil piston downwards via the changeover valve. When the piston is at the bottom of the cylinder a peg on the piston rod breaks a toggle, allowed to straighten when the piston initially moved upwardly, whereby the crank 91 switches off the motor at 42. To avoid unintentionally delivering petrol without oil, cam means 171 associated with the register closes a petrol valve 165 when a predetermined maximum quantity of petrol has been delivered corresponding to the capacity of the oil cylinder 27. Should insufficient oil be present in tank 22, a float therein actuates a latch 151 to engage a projection 146 to prevent raising of switch lever 41. Crank lever 69 may be moved so that arms 65, 66 are free from the two lobed cams 74, 75 and pawl 68 engages a toothed wheel 63 to prevent movement of piston 43 whereby only petrol is delivered.