Patent GB-286319-A (GB)
Title: Improvements in apparatus for delivering measured quantities of liquids
IPC: B67D7/16
Filed: 1926-08-31
Abstract: 286,319. Oakley, E. C. F. Aug. 31, 1926. Fixed-chamber apparatus; valve systems for; varying quantity measured in.-In apparatus for delivering measured volumes of liquid, the liquid is forced into a measuring-vessel by a pump which afterwards functions to draw out and deliver the measured quantity. Fig. 2 shows a measuring-vessel 7 with a pump 1, control valves 9, 10, 12, 13, and a delivery pipe 11. The lift valves 9, 10 are mounted on a sleeve 35, Fig. 3, and a rod 36 respectively, the rod 36 being mounted in a sleeve 16 and the hollow quantitystop rod 15; the parts 15, 16 are connected by a bridge, piece 17. The valves 9, 10 are shown in their lowest (open) position, liquid passing through them into the measuring vessel 7, in which is a float 20, co-operating with mechanism, Figs. 4, 5, and 6, in the head of the chamber, to vary the quantity measured and delivered, and with a twisted strip 86, Fig. 2, to operate quantity-indicating apparatus. The pump is operated by a hand-lever 74, Fig. 3, and the valves 12, 13 are controlled by a hand-lever 71. The quantity to be delivered is first determined by means of a knob 26 and a pointer 26<x>, the knob 26 rotating, by means of a, dependent pin 27, Figs. 3 and 4, a star-wheel 28 and with it the quantity-stop spindle 15 with variously-positioned quantity stops 18, Fig. 2. If the lever 71 is thrown to the right, the valves 12, 13 are closed, and a detent 78 is removed from a star-wheel 79 on the axis of the pump lever, which may then be moved to pump liquid through the connection 5 and the valves 9, 10 to the chamber 7. The float then rises until projections 19 on it meet the predetermined quantity-stop 18. The spindle 15 and the valves 9, 10 are thus lifted, and are maintained in that position, the valve 9 by a pin 41, Fig. 5, falling under a cone stop 40 on the upper end of the rod 36, and the valve 10 by spring-pressed balls entering an annular groove in a sleeve on the upper end of its valve rod 15. The lever 71 is then thrown to the left, opening the cocks 12, 13, and rotating the spindle 45; this moves the ratchet-lever 65, Fig. 4, and rotates by one tooth the star-wheel 28 and with it the quantity-stop rod 15 and the stop 18 which has prevented the upward movement of the float. Continued movement of the lever 71 to the left turns the shaft. 45 still further, and causes the cam 58, Fig. 5, by means of the pin 59, to depress the lever 60, which, engaging with the collar 29, depresses the quantity-stop rod 15 and opens the valve 10. At the same time the pin 43 passes to the right-hand side of the pawl 49. An extension 53, Fig. 6, bearing on a cam 57 on the rod 45 also falls, and permits the guide-rods 21, Fig. 3, of the float 20 to fall, the stops 51, Fig. 3, on them falling below rocking- levers 49<x>, Fig. 2. The valve 9 is now closed, and the cocks 12, 13 are open so that when pumping is continued, it draws the liquid in the chamber 7 through the pipe 8, Fig. 2, and delivers it through the valve 10 and the cock 13 to the delivery pipe 11. When the chamber 7 is nearly empty, the float drops on to the levers 49<x>, which lift and close the valve 10, and prevent further delivery. To bring the apparatus in position for the next delivery the lever 71 is moved to the right; the consequent movement of the cam-shaft 45 causes the pin 43 on the cam 44 to bear against the pawl tooth 49, Fig. 5, and to lift the lever 42, so that the pin 41 is removed from under the cone stop 40, and the valve 9 opens. During this movement the cam 57 lifts the lever 56, 53, raising the float guide rods 21 and the float 20, which is thus lifted off the rocking-levers 49<x>; also the cam 58 and pin 59 depress the lever 60, which opens the valve 10. Pumping may now be begun to re-fill the chamber 7. Except when. the lever 71 is in the extreme right, or extreme left positions, the pump handle 74 is locked by a detent 78 engaging a toothed wheel 79 on its axis.