Patent GB-442404-A (GB)
Title: Improvements in and relating to liquid dispensing apparatus
IPC: B67D7/08
Filed: 1935-05-24
Abstract: 442,404. Dispensing petrol &c. GILBERT & BARKER MANUFACTURING CO., Cold Springs Avenue, West Springfield, Massachusetts, U.S.A. May 24, 1935, No. 15146. Convention date, May 26, 1934. [Class 116] In liquid-dispensing apparatus of petrol-pump type, the control lever of the pump is locked in the inoperative position, the lock - ing means being released by the zeroizing mechanism for a fresh delivery operation only after the indicators have been zeroized. General construction. The apparatus comprises a motor 22, Fig. 1, driving a pump 21 having a suction pipe 221 connected to an underground tank, and a delivery pipe 23 communicating with an air and vapour separating chamber 26 from which the vapour-free liquid passes through a pipe 43 to a flow meter 24, and thence by way of a pipe 27, valve 25, sightflow vessel 29, and hose 28 to the discharge nozzle 30, Fig. 2. The trigger 31 for operating the nozzle valve 32 has a guard 33 which, when the nozzle is not in use, seats over a lug 35 on a fixed bracket 34 and may be padlocked thereto, the lug 35 also functioning to prevent movement of the trigger to open the nozzle valve. The constituent parts of the apparatus are mounted on cross members 40, 41 carried by supporting columns 38, 39, and a casing 37 is provided to enclose the principal parts. The units and fractions indicators 47, 48, Fig. 4, are duplicated on opposite faces of the apparatus and are driven through mechanism enclosed in a box-like girder 50, by a shaft 62 driven through a flexible coupling 63 by the flow meter. The fractions pointers 48 are mounted directly on a shaft 53 which is frictionally coupled by a spring-pressed disc 74 to a sleeve driven through spiral gearing 66 by the meter shaft. The units pointers 47 are mounted on sleeves 57 journalled on the shaft 53 and driven through spur gearing by a shaft 52 which is itself driven through a second spring-pressed friction disc 74, by a sleeve coupled by worm gearing 67 to the meter shaft. Backlash is prevented by employing double spur gears 55, 58 of which one is fast on the shaft 52 whereas the other is loose thereon but tends to be rotated by a spring, both gears being in mesh with a gear 56 on the sleeve 57. Spring- pressed friction plates 76 apply a constant braking effect to the sleeves driven by the meter shaft. Zeroizing-mechanism, motor control gear, and general operation. The units and fractions pointers are manually zeroized by a handle 126, Fig. 7, which drives a shaft 127, spur gears 111, 99 and shaft 90 coupled by bevel gears 89 to the indicator shaft 53. On zeroizing movement being imparted to the shaft 53, the fractions pointer alone turns until the radial face of a cam 81, Fig. 19, fast on the shaft 53, engages a spring-pressed pawl 86 pivoted on the gear 56, whereupon both pointers turn until movement is arrested at the zero position by the engagement with a weighted pawl 83 of a radial face on a cam 80 secured to the gear 56. In a modification, to prevent fraudulent operation, the shafts 52, 53 may be coupled by a combined free wheel and friction clutch device so that both pointers start turning together when the zeroising handle is actuated. The axis of the gear 99 is fixed, but the gear 14 is journalled in a vertically-guided slide 114, Fig. 7, vertical movement of which is necessary after zeroizing for two reasons, viz. : (1) in order to disengage the gears 111, 99, and so leave the pointers under the control of the flow meter, and (2) in order to release the lever 132 controlling the pump motor. The lever 132 is fast on a shaft 133, Fig. 9, which carries a cam 131 for elevating the slide 114 and a crank 141 having a pin 142 engaging in a cam slot 143 in an arm 144 which swings about a fixed pivot 145. The free end of the arm 144 is coupled by a rod 146 to the lever 147, Fig. 7, actuating the meter outlet valve 25, and the lever 147 is coupled by a rod 148 to the pump motor switch 150, Fig. 1. The slide 114 is locked against vertical movement by a pawl 153, Fig. 15, so preventing actuation of the lever 132 until zeroizing has been effected, the pawl being pivoted at 152 and connected by a spring 163 to a second pawl 158 having one tooth 157 which retains the pawl 153 in withdrawn position when it has been actuated to release the slide 114, and a second tooth 162 which is engaged by the slide on its vertical movement in order to trip the pawl 153 so that it may automatically lock the slide on the return movement of the latter. The pawl 153 is tripped by an arm 106, Fig. 13, pivoted to the gear 99 and linked at 103 to an arm 100 loosely mounted on the shaft 92 but carrying a spring-pressed pawl 101 adapted to drive a ratchet wheel 96 fast on the shaft 92. The pivot 103 is normally held at one end of a concentric arcuate slot 104 in the gear 99 by a spring 108 coupling the arm 106 to the gear and accordingly, when the wheel 111 is turned by the zeroizing handle the gear 99 and arms 106, 100 turn as a unit, the pawl 101 turning the shaft 92 (which is flexibly coupled to the shaft 90) to zeroize the pointers. On completion of the zeroizing operation, the shaft 92 is arrested in virtue of the locking of the shafts 52, 53 by the pawl 83, as above described, and prevents further rotation of the arm 100. Thereafter, continued operation of the zeroizing handle and consequently of the gear 99 carries the arm 106 forwards to trip the pawl 153, this further movement of the gear 99 being permitted by the provision of the arcuate slot 104. The slide 114 being thus released, the handle 132 may be moved to a vertical position, whereupon the cam 131 raises the slide to disengage the zeroizing gear, and the crank 141 rotates to swing the lever 144 downwards, so opening the meter outlet valve 25 and switching in the pump motor to commence a delivery operation when the nozzle valve is opened. On the conclusion of the delivery operation, the handle 132 is swung down to enable the nozzle to be replaced on its bracket, this movement cutting out the pump motor, closing the meter outlet valve, and allowing the slide 114 to descend under spring influence until it becomes automatically locked by the pawl 153. The pointers continue to indicate the previously delivered quantity until zeroizing is effected prior to a fresh delivery. Reversing gearing may be fitted so that, whichever of the duplicated indicating devices is observed, the pointers appear to rotate in the same direction when registering a delivery.