Patent GB-494988-A (GB)
Title: Improvements in or relating to liquid dispensing apparatus
IPC: B67D7/08
Filed: 1937-09-14
Abstract: 494,988. Dispensing liquid fuel &c. WAYNE PUMP CO. Sept. 14, 1937, No. 24982. Convention date, Aug. 14. [Class 116] A liquid-dispensing apparatus having a flow meter with quantity and price indicators, has means for concealing the indicators if dispensing is initiated before zeroizing, the indicator concealing-means being rendered inoperative when the indicators have been zeroized. . General construction. The apparatus comprises a suction pipe 26, Fig. 1, and pump 24 driven by a motor 28, the pump discharge-pipe 32 leading to a vapour separator 34 with vent 36. The vapour-free liquid passes through a connection 40 to a displacement-type flow meter 38 which drives by means of a shaft 50 the volume and price indicators visible respectively in windows 58, 56. The metered liquid passes by way of the pipe 42 and sight-flow indicator 44 to the delivery hose 46, whose nozzle, when not in use hangs on a fixed hook 48. Motor control gear, zeroizing, and operation. The motor switch 90 is operated through linkage 86, 84, 80 by a bell-crank 72, Fig. 6, which is pivoted at 74 and has abutment surfaces 68, 70 engaged by slidable plungers 60, 62, the nozzle when on the hook 48 maintaining the plunger 60 pressed inwardly to retain the switch open. When the nozzle is removed for a dispensing operation, the plunger 62 can be pressed, thereby rocking the bell-crank 72 to close the switch and start the motor. This movement of the bell-crank is communicated by an arm 92 thereon, to a rod 94 coupled to a frame 100, Fig. 9, swinging about a shaft 106 and carrying a pivoted member 218 which is yieldingly maintained in one of two positions relatively to the frame 100 by a spring plunger 228 provided with a ball which can snap into recesses 226 in the member 218. The shaft 106 is coupled to an extension of the re-setting shaft 116 of the indicator, re-setting being effected manually by a handle 118. When zeroizing is effected, a cam 222 on the shaft 106 engages a tooth 220 on the member 218 and thereby swings the member 218 so that a spring- pressed pawl 232 mounted thereon cannot engage a tooth on a disc 224 secured to the shaft 106. In this position of the member 218, the pressing of the plunger 62 to start the pump motor results in the frame 100 swinging idly and during this movement, the member 218 wipes past a pawl 236. At the end of the dispensing operation, the plunger 60 is pressed manually, thereby stopping the motor and swinging the frame 100 upwardly, during which movement the pawl 236, by its engagement with a rigid or slightly yieldable abutment 240, trips the member 218 from the position shown on Fig. 9 to a position in which the unoccupied recess 226 is engaged by the plunger 228. In this position, the pawl 232 is swung into engagement with the toothed member 224 and should the pump motor now be started without first zeroizing the indicators, the pawl 232 will rock the shaft 106 to move concealing shutters over the indicators. The shutters 166, Fig. 4, are carried by members 168, 170, 172, 174 journalled on the indicator shafts, the shutters being linked in pairs by bars 180, 210 and being coupled by a bar 186 and pin 204 to a spring- urged lever 190 having an arm provided with a pin 162 which engages in a notch in a disc 158 secured on the re-setting shaft 116. When zeroizing takes place, the movement of the disc 158 rocks the shutter link system to move the shutters over the indicators and a pawl 214 then prevents return of the shaft 116 to expose the indicators without first making a full zeroizing movement which is effected by turning the shaft 116 through a complete revolution whereupon the pin 162 re-enters the notch in the disc 158. According to a modification, the motor switch is controlled by a single lever which is released when the nozzle is removed from its fixed support, the movement of the lever actuating a shaft 320, Fig. 13, to raise or lower a rod 334 and thereby swing a frame 340 about a shaft 346 coupled to the zeroizing handle. The frame is provided with a pawl-carrying member 360 which is maintained in one of two positions corresponding to engagement or disengagement of the shutter control pawl 374, by a spring 368.