Patent GB-461568-A (GB)
Title: Improvements in liquid measuring and delivering devices
IPC: B67D7/08
Filed: 1935-08-22
Abstract: 461,568. Dispensing petrol &c. FIRSTBROOK, H. T., SMALE, N. E., and WAYNE TANK & PUMP CO., Ltd. Aug. 22, 1935, Nos. 23624 and 28513. [Class 116] A liquid measuring and dispensing apparatus, particularly for dispensing petrol, has a valve governed by fast and slow-moving members, of which the fast member is driven by a flow meter, the slow member being driven step-by-step from the fast member. Pre-setting means are provided for initially moving the slow member selectively to any one of a number of positions, in each of which the slow member holds the valve open. General construction. The apparatus comprises a casing 1, Fig. 1, housing a pump and electric motor (not shown), controlled bv a switch 8, the pump discharge 3 passing through a flow meter 2 to a pipe system 4, 6 in which the control valve 5 is fitted. The usual delivery hose with nozzle valve is coupled to the outlet of the pipe 6. A mechanism 13 transmits the drive from a shaft 12 driven by the flow meter, to clock-type indicators registering the units delivered, one of these indicators making a full revolution for each unit, and a slow indicator showing the number of revolutions made by the units indicator. Pre-setting is effected by a knob 61 and the motor switch 8 and release mechanisms for the pre-setting and registering gear are controlled by a lever 7. Zeroizing indicators and pre-setting for the delivery of a selected quantity. A window 73, Fig. 3, in the casing 1 reveals one of a set of numbers, e.g. 0-20, on a disc 72 mounted on a shaft 70 geared at 69, 68 to a shaft 25 which is in turn geared with a wheel 64 connected by a one-way clutch to a shaft 62 manually controlled by a wheel 61, a shaft 66 being also adapted to receive motion from the shaft 62 through an oppositely acting one-way clutch. The shaft 66 is geared at 67 to the fast or units indicator shaft 22, so that on rotation of the wheel 61 in one direction the indicators are zeroized and on rotation of the wheel 61 in the opposite direction the dial 72 is set to indicate the quantity to be delivered. The one-way clutches comprise concentric members 86, 88, Fig. 7, of which the outer, 86, is fast with the gear-wheel 64 but free on the shaft 66, whereas the inner, 88 is fast on the shaft 66, each member 86, 88 having a ramp-and-step face adapted to be engaged by spring-pressed dogs 83, 84 on a member 78. The member 78 may be moved axially to engage or disengage the clutches by a lever 81 linked to a rod 93, Figs. 1, 3, actuated by the cranked end 92 of the control lever 7, but endwise movement of the rod 93 to disengage the clutches is prevented by a latch 97 until the indicators have been zeroized. This latch engages a notch in the rod 93 and is tripped by a plunger 198, Fig. 13, when a plate 199 is rocked by a stud 202 mounted on a gear 203 moving with the units indicator, zeroizing being effected by turning the fast shaft 22 backwards and transmitting this motion, by a cam and pawl 205, 204 to the gear 203 of the units indicator. Zeroizing having been effected and the rod 93 freed, the hand wheel 61 is turned in the opposite direction to pre-set the apparatus to deliver a selected quantity, but once the rod 93 has been moved endwise as a result of raising the control lever 7 to start the pump motor, movement of the hand wheel 61 is ineffective as the clutches are disengaged by the lever 81. The shaft 25 carries a cam 29 adjustably secured to a ratchet wheel 28, Fig. 9, fast on the shaft, the cam having a hump 29a which is moved at the pre-setting operation through an angular distance corresponding to the quantity to be delivered. The ratchet wheel is rotated step-by-step by a pawl 52 on a member 49 which is rocked at each revolution of the shaft 22, by a pin 48, Figs. 3, 10, on a gear 24 freely mounted on the shaft 25 and driven by a gear 23 on the shaft 22. A cam 27, fast on the gear 24, rocks a lever 31 carrying an angularly adjustable cam-piece 38, which, during dispensing, moves freely until a latching shaft 42 is released near the end of delivery as a result of the tripping of the catch 41, Fig. 9, by the actuation of the lever 32 by the hump 29<a> on the ratchet-driven cam 29. The tripping of the catch 41 initiates closure of the control valve 5 as described below. Control valve and actuating mechanism therefor. The control valve 5 comprises a main valve 119, Fig. 11, formed with a stem 118 sliding as a piston within a dashpot cylinder 121 provided with an air port 121<a>, and an auxiliary valve 123 seating in the main valve and having a stem 124 projecting through a slot 117 in the stem of the main valve, so that both valves are successively actuated by an arm 116 on a shaft 60 which is positively coupled through an intermediate shaft 55, Fig. 6, and bevel gearing to the shaft 42. The shaft 60 has a second arm 60a, Figs. 3, 12, which is rocked when the control lever 7 is raised, by a rod 20, Fig. 1, linked to the switch - actuating rod 15, the motion of the rod 20 being transmitted to the arm 60a through a bell-crank 21, Fig. 12, carrying a lever 98 which is held by a spring 99 against a stop 100 on the bell-crank and has a face 101 which rocks and wipes past the end of the arm 60a. The rocking of the arm 60a opens both the main and auxiliary control valves and simultaneously sets the catch 41, Fig. 9. Delivery can then take place on opening the hose nozzle valve and the cam-piece 38, Fig. 10, oscillates freely until, near the end of delivery, the cam hump 29a Fig. 9, trips the catch 41 whereupon the shaft 42 swings until arrested by the engagement of the cam-piece 38 with the face 40<a> of an arm 40 on the shaft, this movement of the shaft corresponding to the closure of the main valve. Delivery continues through the auxiliary valve until the cam-piece 38 is rocked by the cam 27 whereupon the cam-piece moves clear of the face 40<a> and permits a further swing of the shaft 42 until a face 40b on the lever 40 contacts with the cam-piece, this final movement corresponding to the closure of the auxiliary valve and the complete cut-off of delivery. On depression of the control lever 7 to cut out the pump motor after delivery, the lever 98, Fig. 12, yieldingly engages an arm 103 of a bell-crank whose other arm bears on a spring 105 and slightly opens the auxiliary control valve to relieve the hose of excess pressure. The depression of the control lever 7 after delivery also couples the hand wheel 61 with the zeroizing and pre-setting mechanism through the actuation of the rod 93 and lever 81. A clutch is provided between the registering mechanism and the flow meter to eliminate the necessity of turning the flow meter by the hand wheel 61 when pre-setting the apparatus. Provision is made for making a delivery corresponding to the full capacity of the indicating mechanism (20 gallons in the apparatus described), this delivery being effected by pushing a knob 106, Fig. 4, after the pre-setting dial has been returned to zero. The knob actuates linkage 107, 108, 109 to cause a pin 111 on the member 109 to turn the pre-setting dial shaft 70 in the reverse direction to normal pre-setting operation, by means of an arm 112. This movement of the shaft 70 reveals the maximum quantity which can be indicated, in the window 73 and, through the gearing 68, 69 and shaft 25, carries the cam-hump 29a clear of the lever 32, Fig. 9, so that a full revolution of the cam 29 is necessary before the lever 32 is again operated to stop delivery. The movement of the arm 109 by the operation of the push knob 106 also turns the shaft 55, Fig. 6, by means of the dogs 110 in order to swing the latching shaft 42 to set the catch 41, Fig. 9, and hence the shaft 60 to open the control valves, whereupon, the hose nozzle valve being opened, delivery of a quantity of liquid corresponding to the full capacity of the indicating mechanism takes place. Lost motion is provided in the various transmissions governed by the push knob 106, to allow the controls to be actuated by the normal presetting mechanism. A toothed wheel 74 on the shaft 25 is engaged by a roller in a spring- pressed lever 75 in order to facilitate accurate pre-setting.