Patent GB-661187-A (GB)
Title: Improvements in or relating to washing-up machines
IPC: A47L15/46
Filed: 1949-01-05
Abstract: 661,187. Dish-washing machines. PARKIN, G: B. Jan. 5, 1949, No. 255/49. Class 138 (i). A dish-washing machine having an automatic cycle of operations, comprises at least one dish containing and washing chamber, first and second liquid reservoirs, a first two-position selector cock connected separately to discharge means of both reservoirs, to supply means of the washing chamber and to a waste means, and a second two-position selector cock connected separately to discharge means of the washing chamber and to return supply means of both reservoirs the cocks being, arranged for setting in timed sequence so that, liquid from the first reservoir is supplied to the washing chamber and returned to the first reservoir and finally discharged, to waste therefrom., liquid from the second reservoir is then supplied to the washing chamber and returned to the second reservoir and is finally discharged to waste from the first reservoir, the cocks then being reset ready for the next cycle of operations. General features.-The machine, Figs. 1 and 2, which automatically effects the operations of washing, rinsing and drying the dishes comprises upper and lower dish cabinets having floors 122 and 123 respectively and upper and lower pairs of doors 128, 129, and 13Q, 131 respectively; upper and lower spray tubes 120, 121, a common drainage duct 3 connected at 4 with a twoposition selector cock 5 connected to the tops of the reservoirs 124, 125, for washing and rinsing liquid respectively, a two-position selector cock 7 connected with the bottoms of the reservoirs and also to waste, and a pump 9 driven by a motor 127. The motor drives a cam through a reduction gearing to operate in sequence trips, which in turn operate the cocks 5 and 7, and finally open the upper doors of the cabinets, and a shaft 15 to effect a back and forth sliding movement to the spray-tubes through the medium of a crank 14 and rod 13. The cock 5 is operated to return liquid from the washing chamber either to reservoir 124 or 125, and also houses an inlet valve for connecting a hot water supply pipe 134 with both reservoirs, which supply is cut off when the correct level of liquid is obtained in the reservoir by a float 26. The cock 7 is operated either to connect reservoir 124 or 125 with the pump 9 by a pipe 8 and to connect 124 to waste by a pipe 23 when 125 is connected to the pump. The reservoirs are provided with an overflow 24 connected to the waste pipe.23. The pump is connected by a pipe 10 to the spray tubes of which 121 is controlled by a valve 22. Control rods 16 and 20 operable at 132, a lever 19, Fig. 9, operable at 133 and an indicator lamp 21 are provided on the front of the machine. The rod 16 causes the upper doors to open so that the lower doors may then be opened by hand. The rod 20 opens the liquid supply valve and causes an immersion heater to be switched into circuit so that in time thermal switch energizes the motor. The lever 19 can be locked in two positions so as to cause only the spray tube 120 to function or both 120, 121 to function. It also controls the liquid level in the reservoirs and the setting of two of the actuating trip bearing pins viz. 157, 158, Fig. 11, according as to whether one or both spray tubes are in operation. Reduction, gearing, trip mechanism and controls.-The motor shaft drives a pulley connected by a belt to a pulley 58, Fig. 9. A pinion on 58 drives gear 177 which drives a pinion and the shaft 15. The latter pinion drives a gear 176 which drives a pinion to drive a gear 174. The gear wheel to pinion P.C.D. ratio e.g. 13: 1 is such that the gear 174 is driven very slowly. The gear wheels and pinions with the exception of 174 are mounted between plates 12 and 126, Fig. 1. Attached to the gear 174, Fig. 11, is a cam 56 which operates in turn trips 151-156, pivoted on bearing pins 157-162. The trip 151 operates the selector cock 7 through a rod, latch plate 164 and a spindle 61, Fig. 10, and prepares the trip 155. The trip 152 next operates the selector cock 5 through a rod, crank, plate 163 and spindle 60 and also prepares the trip 153. The trip 153 is then moved by the cam 56 to its original position to again operate the cock 5 so as to connect with reservoir 124 and thus to the drain to waste and resets trip 152. Trip 154 opens the doors 128, 129, through a rod, latch plate 32, lever 31 and rod 30, the doors opening simultaneously through a connecting rod 29, Fig. 2. Trip 155 is then returned to its original position to reset 151 and the selector cock 7. Trip 156 operates a switch lever 165 to stop the motor and machine. The door control 16 is connected to the latch plate 32 and the control rod 20 operates a cam 69, Fig. 10, on a shaft 75 by means of a crank 76 to open the liquid inlet valve embodied in the selector cock 5. The rod 20 also rotates a shaft 80, Fig. 9, by shaft 75, a crank 77, rod 78 and crank 79 to move a crank 81, Fig. 11, and actuate switch 165 to energize the immersion heater which in time operates a thermal switch to energize the motor. The lever 19 operates valve 22 through spindle 63, crank 64, rod 172, lever 74 and rod 73 which moves a slide connected to the valve. This lever also sets the position of the trip bearing pin 157 relative to pin 158 as previously mentioned. Finally the lever 19 sets the position of a pin 171, Fig. 10, of a crank 65 which co-operates with an arm on a gate control for the liquid supply valve so as to control in co-operation with the arm 27, Fig. 1, of the float 26, the level of the liquid in the reservoirs according to the number of cabinets in use. Operation.-The lever 19 is set say for double cabinet working. The rod 16 is depressed so that the doors 128, 129 are opened and to allow for the hand opening of doors 130, 131. Dishes are then inserted into the cabinets and all doors closed by hand. The rod 20 is then depressed to actuate the liquid supply valve to fill the reservoirs. At the same time the switch 165 is made to energize the immersion heater and as the water is raised to the requisite temperature, the thermal switch operates to energize the motor, Washing liquid is then drawn from reservoir 124 through the valve 7 by the pump and supplied to both sprays which are moved back and forth by the mechanism previously described. The water drains back into the reservoir 124 and is recirculated to perform the washing operation. The trip 151 then actuates the cock 7 so that the returning washing liquid is discarded to waste from the reservoir 124. At the same time rinsing liquid from reservoir 125 is pumped to the sprays but before it can drain into 124 and to waste trip 152 is operated to change over the selector cock 5 so that the rinsing liquid is returned to reservoir 125 and is recirculated to perform the rinsing operation. The trip 153 then resets the cock 5 so that the rinsing liquid is returned to reservoir 124 whence it flows to waste. The upper doors 128, 129 are then opened by actuation of trip 154 so that the dishes may dry and trip 155 then resets trip 151 and the cock 7 in readiness for the next cycle of operations. Finally the trip 156 opens the switch 165 to shut down the machine.