Patent GB-910865-A (GB)
Title: Method and apparatus for preparing and dispensing a composition
IPC: B29B7/74
Filed: 1961-06-16
Abstract: 910,865. Mixing flowing liquids in proportions. PYLES INDUSTRIES Inc. June 16, 1961, No. 21941/61. Class 86. [Also in Group XXVIII] In apparatus primarily for mixing the components of a polymeric composition, each component is separately pumped to a mixing chamber by a metering reciprocating pump, supply to and discharge from which is controlled by a piston valve, the several pump plungers and valve rods being respectively connected to two common crossheads each actuated by a pneumatic cylinder which in the case of the pumps is of variable stroke. The ratio of the components is determined by the selection of pump plungers of suitable diameters, the plungers being interchangeable. Fig. 1 shows the general arrangement in front view; the mixing chamber assembly 32 is detachably mounted on the front of a panel 42, which also carries an air motor 190 for driving the stirrer, a starting control lever 304, a stroke selector assembly 268 and scale 300, and a counter 208 ; there are tank assemblies 24, 26 for the mixture components. Fig. 9 shows, on the front of the panel 42, the mixer assembly 32, and on its back the valve assembly 50 and metering pump assembly 52 for one of the components. The piston valve rod 60 is shown in its lower position in which materials can reach the pump cylinder 122 from supply conduit 56 past seal 72 and through passages 78, 126; when the valve rod 60 is raised and the pump plunger 116 lowered, material is displaced through passages 126, 78, past seal 68, and through passages 84, 86, check valve 74 and inlet 142 into the mixing chamber 140; there is a separate inlet 142 for each component. The stirrer assembly 132 comprises a shaft 164 rotated by the air motor 190 and carrying a lowermost perforated disc 166 (see also Fig. 15); second and fourth discs 170, 172 having vanes bent alternately upwards and downwards (see also Fig. 14); and middle and top discs 178, 180 having notches 181 (see also Fig. 13). The peripheries of the discs fit closely to the chamber 140. As the components enter through inlets 142, an equal volume of composition is discharged at 162. The pump plungers 116 are connected to a common crosshead 258 (see Fig. 4) which is a partial back view of the panel 42 ; the crosshead is connected by a piston rod 256 to a double-acting cylinder 206. At the end of its downward motion the crosshead 256 strikes a stop 296 adjustably clamped on the rack 270, and thus reverses the cylinder stroke by actuating the valve 200 through movement of the rack 270 and the rocker arm 276 ; the stop 296 is adjustable along the rack 270 by means of the selector arm 284 to vary the length of the pump stroke and thus the total quantity of composition discharged at each cycle. The valve rods 60 are likewise connected to a common crosshead actuated by a double-acting pneumatic cylinder of fixed stroke, see Fig. 5 (not shown). The lever 304 is depressed to start the apparatus and a retainer is provided to hold it down, when the apparatus will recycle automatically. The speed of operation may be adjusted by restrictor valves as at 254, Fig. 4, in the air supply lines to cylinder 206. An hydraulic fluid system may be used to operate the apparatus instead of pressure air. The mixture component storage tanks may be pressurized especially when the viscosity of the components is too high for successful gravity flow.