Patent GB-308756-A (GB)
Title: Improvement in liquid dispensing apparatus
IPC: B67D7/16
Filed: 1928-08-02
Abstract: 308,756. Gilbert & Barker Manufacturing Co., (Assignees of Davis, J. B.). March 31, 1928, [Convention date]. Fixed multiple-chamber apparatus; controlling passage of air; full-stroke arrangements; valve systems.-A liquid dispensing apparatus comprises a pair of transparent measuring cylinders 18 with pistons working therein, valve means 77 connecting one cylinder to a supply conduit while the other is in communication with a discharge pipe, interconnecting mechanism whereby the pistons are constrained to move in opposite directions, and means for rapidly moving the valve and for changing its connections to the supply and discharge conduits. The cylinders 18 are supported on a base member 19 forming the cover to a casing 20 of square cross-section which encloses the pump 71 and the valve, piston and registeractuating mechanisms, and from which projects only the register 21, pump-operating handle 22, valve-operating handle 23 and outlet 24. Each measuring cylinder 18 is surmounted by a crossbar 43 from which depends a set-screw 45 penetrating the cylinder head and forming an adjustable abutment for the nut 66 carried on the top of each piston 49. An air-vent for the upper part of each cvlinder is afforded in the underside of a pipe 47. Each piston 49 carries a cupped packing-washer 51 the annular part of which is' clamped by a ring 53 while lodged within an annular groove covered by the cylindrical part of the washer is a helical spring 50 the coils of which are filled with packing material. A valve 59 which is attached to the upper surface of a float 60 works within the piston 49 and while permitting air to escape is closed by the contact of the liquid with the float. The possibility of air-retention beneath the piston is further lessened by providing narrow cuts 64 radiating from the valve seat and decreasing in depth towards the circumference. The upper surface of the piston is concave so that any liquid which may pass the valve will drain back when the cylinder is emptied. Passages' 67 from the cylinders 18 communicate with the opposite sides of a valve housing 68 formed integrally with the member 19.. A supply pipe 69 opens into the lower side of the housing and is connected to the pump 71 by a pipe 70. From the upper side of the housing leads the discharge passage 73 in alignment with the outlet fitting 24. The outflow may be observed through a transparent part 74 of the fitting 24, an air valve 75 preventing siphon action, and the edge 76 of the passage 73 is on the same level as the surface of the cylinder ends 19. The plug-valve 77 is cut away leaving a diametrally-disposed bar 77<1>; its stem 80 passesthrough the cap 78 and carries a lever 81. Automatic and rapid throwing-over of this lever 81 is effected by linkwork shown in Fig. 8 and dependent on the movement of the piston-rods 65. These are connected by. a chain 90 passing round grooved rollers 91, but in order that a dwell may be occasioned to each piston at its lowermost position a resilient attachment is provided. The two ends of the chain rods 86 enveloped by springs 89 traverse arms 85 fixed to the piston rods. Loosely encompassing each piston rod is a block 122 which by a link 121 is connected to a lever 119 pivoted on a spindle 115 supported in a bracket fixed to the pipe 70. To the spindle 115 there is also fixed a lever 114 working within the forked end of a lever 107 pivoted to a stud 109 projecting from the valve cap 78. A rod 106 surrounded by a spring 105 extends from the upper end of the lever 107 between the arms of a fork 108 swivelling on the valve. lever 81. Latches 95 retain the lever 81 in its extreme position until the upper surface 104 on the arm 85 projecting from the piston rod 65 lifts the end 99 of a rod 98. The upper part of this rod slides within a bearing in the cross-bar 82 and its end is turned over to pass through the latch 95. Before the latch can be released, however, the spring 123 has been pressing up the block 122, thus tilting the upper end of the rod 107 to the right and compressing the spring 105. The lifting of the latch is followed therefore by a speedy swing of the valve lever 81 to its extreme left position, with the consequent change in fluid flow. 'The removal of fluid pressure from the piston which is at the top of its stroke permits the springs 89 to come into play and rapidly start the discharging action. Stops 83 on the bar 82 limit the movements of the lever 81 while the swing of the lever 114 is similarly checked by the engagement of one of the depending portions 117 with the spindle 118. Smaller quantities than that dispensed by the cylinders 18 are supplied from an additional cylinder 138. A valve 141 functions' similarly to the float valve 59 in the main cylinder. Interposed in the main supply pipe 70 is a valvehousing 143 containing a plug valve 144 having an actuating stem 145 to which is fixed a lever 147. The lower end of this lever projects through the casing and carries an actuating knob 23. In 'its central or neutral position this knob 23 places a passage 148 in the valve 144 in alignment with the passages supplying the main cylinders 18. When moved to the left or right the knob 23 moves the passage 148 out of line and brings a curved passage 149 in the back part of the valve into register, in the one position, with a lateral passage 153 leading from the pump and with a vertical pipe 154 leading up to the cylinder 138, while in the other extreme position of the part 23, connection is made between the pipe 154 and the discharge passage 155 leading to the outlet 24. This apparatus may be mounted as a unit upon a sheet metal pedestal of hexagonal cross-section, two of the sides being hinged to form doors by which access may he obtained to the pump handle 22. The pedestal cap supports a casing closed at the top by a cap carrying an ornamental dome. The casing is cut away except for two diametrally opposed parts supporting sliding doors by opening which the dispensing apparatus proper is exposed. The latter is carried within the housing by straps. With counting apparatus.-The register 21 records the number of operations of the main valve 77, and is mounted by studs 124 on the bracket 116; a frame 125 carries its operating shaft and has a ratchet 127 affixed thereto. A Y-shaped lever 128 pivoted to the stud 129 carries on one of its upstanding arms the pawl 130 by which the ratchet 127 is advanced. Return movement is prevented by a holding pawl 131. The other arm of the lever 128 is linked to a rod 135 slidable through the hub 110. A spring 137 presses the upper end of the rod against one of a pair of cams 136 forming the lower end of the rod 81. Separate recording apparatus 157 of the cyclometer type records the usage of the auxiliary chamber 138. This apparatus is mounted on a bracket 158 secured to the lever 147 and has a star wheel 159 in the path of which lies a cylindrical pin 160. This pin is pivoted to a fork secured to the stud 124 and can swing freely in one direction, so that no movement is imparted to the star wheel when the lever 147 is moved into filling position. Part of the valve-cap 146 is formed as a toothed segment 164 with which engages a reversible pawl 163, pivotally connected to the upper end of lever 147. Through an opening in the pawl 163 passes a spring 165 the other end of which is fixed to the lever 147 and which spring tends to keep the pawl in its central position. As shown in Fig. 11, movement of the upper end of lever 147 to the right is prevented during the leftward filling movement. As the lever movement is completed, however, the pawl rides off the toothed segment and is brought by the spring 165 into a central position in alignment with the length of the lever. The discharge movement is now permitted but retrograde motion is again prevented by the pawl. During the movement to the right the counter is actuated, and at the end the pawl 163 is brought to the position which allows the neutral position of the arm 147 to be assumed.