Patent GB-238313-A (GB)
Title: Improvements in dish washing machines
IPC: A47L15/42
Filed: 1924-05-21
Abstract: 238,313. Couch, E. Le R. May 21, 1924. Plates, dishes, and the like, washing.-The dishes are placed in a casing over tanks of washing and rinsing fluids, and upon closing the door of the casing an electric motor is started to rotate a pump, lock the door and operate valve mechanism so that first washing fluid and then rinsing fluid is pumped from the tanks to oscillating spraying arms within the casing. Further valves are then operated to introduce fresh rinsing water and steam and finally the door is unlocked and the motor automatically stopped. The washing compartment 20 has a sloping bottom 25, 26 and a drain aperture 24 governed by a flap valve 28 pivoted at the top of a partition 23 separating the washing- fluid tank 21 and the rinsing-fluid tank 22. The dishes with washing-powder are arranged in a basket 57 which is slid into the compartment 20 on guide-brackets 111, the hinged door 126 is then closed pushing back locking bar 116 against a spring 123 so that a circuit-closing member 129 connects two spring blades 130 to close the circuit of the motor 83 driving the centrifugal pump 52. A valve box 33 fixed to the side of the casing communicates with the washing-fluid and rinsing-fluid tanks by valves 43, 44 respectively and with the suction pipe 51 of the pump. Through the box 33 passes a cam-shaft 34 driven from the motor and carrying a series of cams of which one 113, acts first to release a rod 114 pressed downwards by a spring 118 so that an aperture 115 in the rod engages with notches 117 in the locking bar 116 to lock the door. A cam 25 then opens the valve 43 so that the pump draws fluid from the washing-fluid tank 21 and supplies it through a pipe 53 to a casing 54 whence it passes to a pipe 55 and is guided by a deflector 137 into pipes 104 leading to spraying pipes 105. The pipe 55 is rotatable in the casing and carries gear teeth 94 which mesh with a gear sector 95 on a lever 96 pivoted at 97 and having a slot in which engages a pin on a disc 99 driven by a chain gearing 103 from the motordriven shaft 86; the spraying arms are thus continually oscillated. After nine seconds the valve 43 is closed and the valve 44 opened by a cam 36 so that rinsing water is supplied to the spraying arms. For the first two seconds of this rinsing action the flap valve 28 remains in its original position thus returning the rinsing water to the washing-fluid tank 21 to renew the washing fluid, excess being removed by an overflow 58, then the valve 28 is rocked by a cam 37 and for 8 seconds rinsing is continued with the return of the rinsing- water to the tank 22. The valve 44 is then closed and a cam 90 on the shaft 34 lifts a rod 92 to open a valve 59 in the casing 54 and supply fresh rinsing water for 3 seconds; this Water, after being sprayed on the dishes, falls into the tank 22 to replace the rinsing-water transferred to the tank 21. A cam 89 then lifts a rod 91 to open a valve 60 and supply steam to the spray pipes for 3 seconds, after which the cam 113 lifts the rod 114 to release the bar 116 which then takes up the position shown in dotted lines in Fig. 3, switching off the motor and unlocking the door.