Patent GB-473104-A (GB)
Title: Improvements in liquid dispensing apparatus
IPC: G01F15/07
Filed: 1936-08-28
Abstract: 473,104. Dispensing liquid fuel &c. GILBERT & BARKER MANUFACTURING CO. Aug. 28, 1936, No. 23621. Convention date, Sept. 5, 1935. [Class 116] An apparatus for dispensing liquids, particularly liquid fuel has the hose nozzle automatically locked on replacement after a delivery operation, removal of the nozzle being prevented until the indicators have been zeroized. General construction. The apparatus comprises a pump 15 driven by a belt from an electric motor 16 and drawing from an underground tank (not shown) through a suction pipe 171 and discharging through a pipe 18 and flow meter 19 to a pipe. 20 leading to a visible flow indicator 22 and thence through a hose 21 and nozzle 23. The flow meter drives through a shaft 27 quantity and price computing indicators 29, 30 and a shaft 31 may be turned by a hand crank 32 to zeroize the indicators. Nozzle support and locking mechanism. The nozzle 23 has a trigger 25, Fig. 5, and a guard 26 adapted to engage over a lug 38 on a support 37, a perforation being provided in the lug so that the nozzle guard may be padlocked thereto. A slot 56 in the nozzle guard receives a lever 55, when the nozzle is on its support, the lever 55 being fast on a shaft 54 and being linked to a plunger 60 adapted to rise into locking engagement with a disc 61 on the zeroizing shaft 31 providing the indicators have been zeroized. A bar 65, Fig. 6, pivoted at 66 is urged by a spring 67 so that the righthand end (as viewed in Fig. 6) engages behind a step 64, Fig. 7, on a cam 63 fast on the lever 55, an abutment 76 being provided to prevent flexure of the lever 65 in case the lever 55 is forced upwards in an attempt to remove the nozzle. The lever 65 is engaged at its opposite end by a plunger 68 which is depressed by a cam 69 on the zeroizing shaft 31 when the shaft is turned. A complete revolution of the shaft 31 is necessary to zeroize and effect release of the nozzle-retaining lever 55, as although the lever 65 is tripped by the cam 69 after part of a revolution, the plunger 60 is prevented by the disc 61 from sufficient upward movement to effect release of the nozzle, until the notch in the disc 61 again registers with the plunger 60 after the complete zeroizing movement. A catch 70 free on the shaft 54 is urged by a spring 73 into contact with a lug 74 on the cam 63, the catch having a greater radius than the step 64, so that on replacement of the nozzle, and consequent depression of the lever 55 after a dispensing operation, the catch is held by the lever 65 thus allowing the lever 65 to fall in front of the step 64. The nozzle is thus automatically locked on replacement, until a fresh zeroizing movement lifts the lever 65 and allows the catch 70 to reengage with the stop 74. On replacement of the nozzle, its upper end engages within a socket 77, Fig. 1, in the casing. Means are provided to allow the motor to commence pumping, before removal of the nozzle, so that any deficiency of liquid in the visible flow indicator 22 may be made good before dispensing. The motor switch may be actuated by a lever 44, Fig. 2, yieldingly coupled through a spring 47 to a rod 42 pinned to an arm 39 on the manual motor control lever 35. A first movement of the lever 35 starts the motor, but the arm 39 engages with the nozzle guard so that if the lever 35 is released before removing the nozzle a weight 43 on the rod 42 re-opens the motor switch. On zeroizing, and removing the nozzle, the lever 35 can be swung completely over, whereupon the weight 43 maintains the motor switch closed. In a modification, the weight 43 is omitted, and sufficient lost motion in the nozzle locking-mechanism is provided to allow the nozzle to be lifted without complete removal and so enable the lug 39<1>, Fig. 4, on the motor control lever 35<1> to be swung past the nozzle guard to start the motor. According to a further modification, the nozzle guard 26, Fig. 4, rests on a switch controlling arm 82 to maintain the switch open, until the nozzle is lifted, such lifting not being sufficient to enable the nozzle to be removed. The arm 82 can then be moved manually or otherwise to close the switch and start the motor.