Patent GB-1309175-A (GB)
Title: Fixed quantity liquid supplying apparatus
IPC: B67D7/30
Filed: 1970-10-29
Abstract: 1309175 Liquid dispensing apparatus TOKICO Ltd 29 Oct 1970 [1 Nov 1969 24 Aug 1970] 51419/70 Heading A4T [Also in Division G4] Liquid dispensing system Fig. 2. Counters 63, 62 are respectively pre-set to quantities at which dispensing of a liquid, e.g. fuel supplied to a tanker, is to be slowed down and stopped. When a start valve 20 is operated, air is supplied from pipe 37 to set flip-flop 55, 56. Flip-flop 55 separates an indicator 74, closes a switch 59 to energize a pump 11, and opens valves 39, 40, the higher pressure supplied by valve 40 passing through OR device 45 to fully open fuel supply valve 13. The output 56-5 of flip-flop 56 supplies air to a pulse generator 64 driven by a flow-meter 12 to actuate counters 62, 63 as the fuel flows along pipe 10. When the quantity pre-set in counter 63 has been dispensed a fluid signal is obtained at 63d to block the supply of air pulses to counter 63 at NOT 70 and to block the control input to valve 40 at NOT 61 so that the lower pressure supplied by valve 39 passes through OR device 45 and valve 13 is partially closed to reduce the flow-rate in pipe 10. When the full amount pre-set in counter 62 has been dispensed, a fluid signal is obtained from 62d to reset flip-flop 56 followed by flip-flop 55, thereby stopping pumps 11, closing valve 13 and supplying a signal to reset inputs 62a, 63a of the counters. If, for example in an emergency, it is desired to interrupt the dispensing operation; flip-flop 55 can be reset by actuating a valve 21, the counters retaining the quantity of fuel dispensed up to that time. Other, similar embodiments are described with reference to Figs.5-8 (not shown), the 2-stage closure of valve 13 being optional, and a single counter, which may be directly driven by the flowmeter, providing one or two fluid output signals to control the shutting-down of valve 13. Fluid-actuated counter Fig.3. Pre-setting wheels 138 coupled to counter wheels 132 are rotated to set up the desired quantity of fuel to be dispensed. Air pulses representing flow of fuel are supplied at 62c to displace diaphragm 127 and increment the units wheel 132 on the return stroke of pawl 131a, wheels 138 also being incremented backwards. When the pre-set count is attained, rollers 150 drop into the now aligned notches in cams 140 to release pin 144 from latch 149 so that a shield plate 121 is raised and pressurized air passes from pipe 120 to chamber 109 resulting in a high-pressure signal from control output 62d to control shut down of the fuel supply valve. A reset signal applied to input 62a displaces diaphragm 122 to rotate levers 126, 152 clockwise. Lever 152 hits heart cams 135 to reset the counter wheels 132 and lever 126 raises pin 144 to re-engage latch 149. A manual reset button 162 is also provided. Directly-actuated counter, Fig. 8. Pre-setting knob 252 operating through gears 253, 254 slide respective rollers 256 along a rod 257 so that they are each aligned with one of ten cams 260 according to the pre-selected digit. Each cam 260 in a set has a differently positioned notch 261 so that rod 257 is only displaced under the action of spring 263 when the count registered by wheels 259 corresponds to the pre-selected quantity. Rod 257 actuates a valve in the fluid control circuit supplying the fuel shut down valve. An additional cam (not shown) may cause partial shut down of the valve when the amount dispensed is half a unit short of the pre-selected quantity.