Patent GB-849093-A (GB)
Title: Liquid mixing and proportioning apparatus
Inventor: PANDE HENRY
IPC: G05D11/13
Filed: 1956-12-12
Abstract: 849,093. Batch and continuous-discharge mixing machines. HARDMAN CO. (Inc.), H. V. Dec. 12, 1956, No. 38013/56. Class 86 [Also in Groups XXIV and XXVIII] A liquid mixing and proportioning apparatus for two liquids comprises a rotary pump 10, Fig. 1 reciprocating means 16, 20, 14 adapted to turn the shaft 39 of the pump 10 at predetermined intervals to give intermittent pumping of one liquid and means 48, 46, 52 connecting with another pump 12 (reciprocating piston pump) to simultaneously pump a proportionate quantity of the other liquid, the two liquids entering a chamber 68 to be mixed by a paddle 76 rotated by an electric motor 80, and the mixture delivered to a nozzle 84. The pump 10 e.g. for a viscous liquid base resin is connected by an overrun clutch 38 with an arm 36 pivotally connected to one end of an arm 14 the other end of which is adjustably pivoted by a bolt 23 in a slot 22 in an arm 20 carried by a known single revolution clutch 16 which, when engaged, is driven by an electric motor 15. The clutch 16 is engaged by energizing a solenoid 30 which lifts an arm 24, pivoted at 25, the arm 24, Fig. 2, having a shoulder stop 26 normally engaging a key 28 which is cammed out of engagement with the driving member of the clutch. When the arm 24 is lifted the key 28 is moved by a spring (not shown) to engage the clutch whereafter the arm 2 is rotated. As soon as the clutch is activated the solenoid is automatically de-energized whereby the arm 24 falls under gravity and disengages the clutch when the latter has made one revolution. The arm 36 in its upward movement drives the pump 10 through the overrun clutch 38 and thus the base resin is delivered by a pipe 70 to the bottom of the mixing chamber 68. A link 48 pivoted to the arm 36 is pivotally connected at its lower end to an arm 46 on a pivot 50. The arm 46 has a slot 51 to pivotally receive one end of an arm 52 pivoted at its other end at 56. Slidably adjustable by a screw 59 on the arm 52 is a slide 58 which is pivotally connected by a pin 60 with the piston of the pump 12, the latter being provided with known inlet and outlet valves at 62. The linkage is such that the liquid (catalyst) pumped by the pump 12 is in substantially direct proportion with the liquid delivered by the pump 10 for all displacements of the arm 36. The catalyst is supplied by a pipe 72 to the chamber 68 above the level of the pipe 70, the pipe 72 having a check valve to prevent entry of base resin thereinto. Adjustment of the stroke of the pump 10 by the bolt 23 does not affect the relative proportions of the liquids, the latter being altered by adjusting the slide 58 on the arm 52. The pump 12 may be disconnected from the drive by removal of a pin 85. In a modification Fig. 6, the pumps 94, 82 are both rotary pumps, the pump 92 being used for a viscous liquid catalyst and the drive connections for the pump 92 are simplified. The overrunning clutch 113, for the shaft 124 of the pump 92 may be selectively disengaged. Referring to Figs. 7 and 8, the clutch 113 is of known construction comprising a driving housing 126, rotated by the arm 110 Fig. 6, and a driven member 128 keyed to the shaft 124 and provided with triangular notches 130 for balls 132 under the urge of springs 136. The balls 130 may be disengaged from the housing 126 by pins 138 carried by a plate 140 rotatable relative to the member 128. Balls 142 are disposed in holes 144 in the plate 140 and can coact with grooves 146 having inclined cam surfaces 148 in the end face of the member 128. The balls 142 are urged through the holes 144 and into the grooves 146, to rotate the plate relative to the member 128 and so disengage the balls 132, by a sliding plate 150 urged to the right in Fig. 7, by a forked arm 152 and spring 158. The clutch 113 is engaged by energizing a solenoid 154 whereby the springs 136 move the balls 132 into engagement with the housing 126 and thus move the pins 138 which latter rotate the plate 140 so that the balls 142 move out of the grooves 146.