Patent GB-898355-A (GB)
Title: Improvements in and relating to devices for delivering mixtures of two liquids
IPC: B67D7/74
Filed: 1958-09-19
Abstract: 898,355. Change-speed gear. CHIANTELASSA, A. Sept. 19, 1958 [Oct. 12, 1957; May 19, 1958], No. 30073/58. Class 80 (2). [Also in Group XIX] In liquid dispensing apparatus adapted to deliver a selectable range of blends of two liquids, means are provided to indicate the price per unit of the blends and the total cost of the amount dispensed. As shown, Fig. 5, a shaft K rotates in accordance with the quantity of liquid dispensed and drives, through adjustable gearing including a gear cone 22, a shaft 87 actuating the price indicating wheels (not shown). A single control member is adapted to select the desired blend, effect the indication of its unit price, and adjust the drive to the shaft 87.  Indicating unit price.-The unit price of the mixture dispensed is displayed on numeral wheels 26, 27, 28 and also on an auxiliary set of numeral wheels 44, 45, 46, Fig. 7, disposed on the opposite side of the liquid pump and driven by means of bevel gearing and connecting rods from the wheels 26-28. The wheels 26-28 are mounted on vertical axes and connected to cylindrical drums 23-25 ; each drum being provided with a number of horizontal rings of holes 47, a peg 48, Fig. 6, being inserted in one hole in each ring. The pegs 48 co-operate with the arms 50-52 of a rake-like member 49, and the rake is positioned vertically, in dependence on the particular blend dispensed, the pegs 48 being so arranged that the rotation of the drums 23-25, which are driven by a friction clutch, is halted by the pegs striking the arms of the rake, the numeral wheels 26-28 then indicating the correct unit price. Adjusting transmission ratio.-The bevel gears driven by the drums 26-28 rotate rods 32-34 which by means of bevel gearing at their other ends drive cams 38-40 in the form of cylindrical drums bearing continuous grooves such as 62, Fig. 5, with which co-operate elements 63 on adjustment plates 64-66, Fig. 6, which carry gear trains meshing with the gear cone 22. Each gear train is therefore positioned on the cone 22 at a point corresponding to the rotation of the associated drum. The plates 64-66 drive a differential adder 86, Fig. 5, whose output drives the shaft 87. The rake 49 is connected to a further adjustment plate 61 which also carries a gear train meshing with the cone 22 and adapted to rotate a shaft driving a totalizer indicating the total quantity of one of the fluids dispensed. The plates 61, 64-66 are connected to a further plate adapted to release the gear trains from the gear cone. Operation.-To effect the required adjustment a knob 74 mounted on a shaft 75 is swung about an axis 76, a tie rod 73 being arranged to control the release of the gear trains from the gear cone. The movement thereby applied to a linkage 84 causing the translation of a rack 53, Fig. 5, which in turn rotates the driving gear 55 of the units drum 28 and hence the higher order driving gears 57, 58 by intermediate pinions 56, 58, Fig. 6. The drums will read zero when the shaft 75 has been fully swung to engage gears 78, 79. The knob 74 is now turned and by means of connecting rods and gearing effects adjustments of the blend ratio by means not shown and correspondingly sets the rake 49 in the appropriate vertical position. When the rake is at its desired position the shaft 75 is returned and during its upward movement the rack 53 moves to cause rotation of the drums 23-25 until stopped by contact of the pegs with the arms of the rake thereby setting up an indication of the unit price and effecting adjustment of the transmission ratio to the price wheels as described above. When liquid is delivered the shaft K rotates the cone 22, take-off gear trains driving the plates 64-66, Fig. 6, in ratios corresponding to the associated drums 23-25, the various rotation being added in the differential 86.