Patent GB-524570-A (GB)
Title: Improvements relating to liquid measuring and dispensing apparatus
IPC: B67D7/42
Filed: 1939-02-01
Abstract: 524,570. Dispensing liquids. AVERY-HARDOLL, Ltd., and FRASER, J. Feb. 1, 1939, No. 3380. [Class 116] [Also in Group XXIX] In liquid-measuring and dispensing apparatus of the flow-meter type in which there is provided under the direct control of the operator means for imposing a check on delivery and means under the control of the indicator mechanism for automatically effecting cessation of delivery at a predetermined position of the indicator mechanism subsequent to the imposition of the check or delivery, there is provided means permitting a seepage of liquid past a cut-off valve, thereby allowing it to reopen so that upon a re-opening of the control valve in the dispensing nozzle renewed delivery can take place. The invention is a modification of the form of apparatus described with reference to Fig. 4 in Specification 478,129. The outlet 33 from the meter leads into a housing 34 within which is a slidable cylindrical flow valve 35 having a finned skirt 35a of greater diameter than the upper portion. A valve rod 38 slidably mounted within a sleeve 39 connected to the valve 35 by radial members 40 carries at its upper end a cut-off valve 43 with a notch 43a to permit of a seepage flow and at its lower end a control valve 37. A relatively weak spring 41 is positioned between the valve 37 and the valve 35 and a relatively strong spring 42 between the valve 37 and a collar on the rod 38. Above a cap 43b on the upper end of the rod 38 is an arm 44 on the spindle of a crank arm 46 connected by a link 47 to a trip arm 48 carrying a projection 48a and a pawl 52 adapted to co-operate respectively with a locking arm 54 and a cam 55 on the gallons shaft of the indicating mechanism. The delivery nozzle includes a trigger lever 62 formed at the end with a stepped section 62a which co-operates with the head 63a of a detent 63 so as to give during the range' of movement of the lever, a position at which the operator feels a greater resistance to movement. In this position the valve 67 is open only sufficient to give a dribble flow. In operation, when the delivery valve 67 is opened, pressure on the unbalanced lower portion of the valve 35 causes this valve to move downwardly thus allowing a flow through the housing 34 and also preventing a closing of the cut-off valve 43 due to the pressure on the lower sides of valves 43 and 37. When the required quantity of liquid has been delivered to within the last gallon, the operator allows the lever 62 to move to the dribble flow position. When the rate of flow is reduced, the valve 35 moves upwards and is followed by a corresponding movement of the valves 37 and 43 to a position where the cap 43b abuts the arm 44. As delivery of the last half gallon proceeds, a pin 55a on the cam lifts the locking arm 54 and a movement of the trip arm 48 takes place but is arrested by the nose of the pawl 52 contacting the periphery of the cam disc. When the prescribed quantity has been delivered, the nose comes into register with a flat 55c on the cam and the arm 48 moves sufficient to allow the closing of the cut-off valve 43 under the influence of the spring 42. Seepage through the notch 43a restores the balance of pressure thereby enabling the valves 35, 37 and 43 to return to their normal positions so that, if the pump is still operating, a further quantity may be delivered by fully depressing the delivery valve lever 62.