Patent GB-841331-A (GB)
Title: Improvements in or relating to apparatus for dispensing a mixture of liquids
Inventor: SPALDING ROBERT GEORGE
IPC: B67D7/74
Filed: 1958-03-19
Abstract: 841,331. Mixing liquids in flow. WAYNE TANK & PUMP CO. Ltd. March 19, 1958, No. 8873/58. Class 86 [Also in Group XXVIII] An apparatus for dispensing a mixture of two liquids (e.g. petrol and oil) comprises separate tanks 1, 2, Fig. 1, for the liquids, a hand operated pump 3 to deliver the liquid (petrol), to be supplied in preponderating proportion from the tank 1 through a piston-tyre liquid meter 4 and conduit 5 to a mixing chamber 6, and a liquid measuring pump 7, Fig. 2, connected to the tank 2 to deliver the other liquid (oil) through a conduit 8 to the mixing chamber 6, the pump 7 being driven by the meter 4 and the latter having piston means 16 associated therewith to enable a register 10 driven by the meter 4 to record the total quantity of the two liquids dispensed. The oil and petrol in separate compartments of the chamber 6, mix together over a weir and are then discharged through a hose 9. Referring to Fig. 2, the meter 4 of known kind drives, in known manner, the resettable register 10 which indicates that one unit of mixture has been dispensed for each complete cycle of the meter although the quantity of petrol passing therethrough in each cycle is variable. A piston 11 of the meter is directly connected by a spider 12 to a hollow piston 15 in a barrel 14 of the oil pump 7. The latter is connected by an inlet opening 23<SP>1</SP> and ball valve (not shown) with the tank 2 and has an outlet connected to the conduit 8 and controlled by a ball valve 23. The piston 15 has two bores separated by a shoulder provided with a washer 24 and an end wall 17 defining two ports 18. The piston 15 slides within a normally stationary sleeve 19 adjustable within a space 25 by a rod 20 and straps 21. When the ports are covered by the sleeve the piston is effective to suck-in or deliver oil and the position of the sleeve determines the quantity of oil to be delivered. The piston 16 is slidable in the larger bore of the piston 15 and when the latter is fully withdrawn on its suction stroke the piston 16 abuts the washer 24. In the position shown corresponding to the minimum discharge of oil the piston 16 is moved to the extreme right hand end of the piston 15, after the piston 15 has completed its discharge stroke. When the sleeve 19 is adjusted to the left the piston 16 will adopt a position to the left of that shown at the end of the discharge stroke of the piston 15. The arrangement is such that the pistons 15, 16 always vacate a space, within the petrol cylinder of the meter 4, which is of the same volume as the oil dispensed so that the register indicates the total quantity of oil and petrol dispensed. As the piston 15 moves to the right from the position shown the volume of oil in the space 25 and interior of the piston 15 initially remains constant by the movement of the piston 16 to the left and when the ports 18 are just closed the piston 16 abuts the washer 24. If the sleeve had been in any other position to the left of that shown, the piston 16 would have been locked at a position to the right of the washer 24 when the ports closed and to ensure that the piston is moved to abut the washer 24, a groove 28 is provided in the piston 15 which allows excess oil to discharge through a port 27 in the barrel 14 and a pipe 26, Fig. 1, into the tank 2.