Patent GB-317349-A (GB)
Title: Improvements in apparatus for delivering measured quantities of liquid
IPC: B67D7/16
Filed: 1928-05-14
Abstract: 317,349. Oakley, E. C. F. May 14, 1928. Addition to 286,319. Fixed-chamber apparatus.-Liquid is forced by the rotary pump 1 into the measuring chamber 7 and is delivered therefrom by the same pump, which draws from a reservoir through a, pipe 3 containing a non-return valve 4 and delivers to a valve chamber 6 containing two valves 9, 10 controlling the communications to the mercury chamber 7 and the delivery pipe 11 respectively. A delivery pipe 8 runs from the upper part of the chamber 6 to a point in the pipe 3 between the valve 4 and pump 1. Valves 12, 13 open and close the pipes 8, 11 simultaneously, the bar connecting the two valves being linked to the setting handle 17 by a rod 15. Within the measuring chamber a tubular rod 18 carries projections 19 any one of which may be rotated into the path of a stop 20 on a float 21. A rod 24 working within the rod 18 carries at its lower end the upper valve 9 for closing the inlet to the measuring chamber, and at its upper end slides within a sleeve 25 secured beneath a fixed plate 26. A circular plate 27 is secured to the valve rod 24 and is urged upwardly to close the valve by a spring 28. Catches 31<x> on bell-crank levers 30 hold down the plate 27 during part of the cycle. To rotate the rod 18 and vary the quantity deliverable, a knob 32 above the casing is turned. Its spindle 34 is attached to a disc 37 from which a pin 44 projects into engagement with an arm 45 an the upper end of the spindle 24. The edge of the disc 37 is serrated and engaged by a roller in a spring-pressed arm. The lower valve 10 is carried by a tubular member 46 through which passes the lower end of the rod 24. The member 46 is integral with a plate 49 pressed upwardly by a spring 50, but is held down by catches 55 on bell-crank levers 54; the long arms of these levers come into contact with the float 21 when the latter is in its lowermost position. The spindle 57 of the lever 17 is fitted with a camplate 16, Fig. 10. One surface 59 acting through the members 60, 61, 62, 64 depresses the guide rod 23 and brings a pin 67 to bear against the plate 49, thus holding open the valve 10. A second cam surface 68 acts similarly on the rod 22, the upper end of which carries a projection 77. With counting and other registering apparatus. -A twisted rod 87 slides through a tube 88 in the float 21. Its upper end is furnished with a counter mechanism 89 visible through an aperture in the top of the vessel. A gauge glass 91 may be provided for indicating the quantity in the measuring vessel, or an inverted cup-shaped part 92 may be secured to the upper part of the twisted rod 27, said part having figures on its vertical wall, visible through an aperture 93. The total of the counter mechanism may be inspected through an aperture in the top of the cup 92, this aperture being arranged to coincide with the aperture 90 in the casing when the float is in its lowest position. In operation, the cap 32 is set for delivering the required quantity. The lever 17 being in its extreme right-hand position, Figs. 1 and 10, the pin 16 is lifted on to the highest point of cam 59 and depresses guide rod 23; the pin 67 on the rod 23 forces down plate 49 and opens lower valve 10. Valve 9 is also being kept open by the ends 31<x> of the hooked levers 30. By means of the rotatable handle 79 the pump is actuated through chain-and-sprocket gearing. The float 21 rises until the stop 20 engages the projection 19 on the stop rod 18. The top of this rod lifts the bridge piece forcing up the levers 30 and releasing the catches 31<x>. The spring 28 then lifts plate 27 and rod 24 to close the valve 9. The lever 17 is now thrown across to its other extreme position. This allows rod 23 and pin 67 to rise, but the catches 55 on levers 54 keep open the valve 10. At the same time the rod 15 is raised and the cocks 12, 13 opened, while the cam 68 pushes the weighted lever to the left without moving the other members associated therewith. Pumping then proceeds, the liquid from the chamber 7 being discharged by way of the pipe 8 until the float 21 reaches the levers 54; the catches 55 are released and the valve 10 closes and stops further delivery. On throwing the lever 17 to the right again the rod 72, Fig. 3, is rocked, and the guide rod 22 depressed, bringing stops 77 to bear on the plate 27, thereby reopening valve 9 through the vertical rod 24; the catches 31<x> re-engage the plate 27 and maintain valve 9 open, while cam 59 effects the re-opening of valve 10.