Patent GB-502754-A (GB)
Title: Improvements in dish-washing machines
IPC: A47L15/42
Filed: 1937-11-27
Abstract: 502,754. Dish - washing machines; valves. BOLINDER'S FABRIKS AKTIEBOLAG. Nov. 27, 1937, No. 32790. Convention date, Dec. 2, 1936. [Class 138 (i)] [Also in Group XXIX] In a dish-washing machine comprising one spraying system for washing liquid, and another for rinsing liquid, each operated by a pump, a flow control valve in each system and a discharge valve or valves for emptying the system are operatively interconnected and actuated by one or more members to eliminate risk of wrong valve settings. In one position of the control member, for washing the dished, the washing flow valve is open, the rinsing flow valve is closed, and the discharge valve or valves prevent discharge from the washing system. In a second position, for rinsing the dishes, the rinsing system is open and the washing system is closed, and in a third position the discharge valve or valves are open and the flow valves are adjusted to permit discharge from both systems. If desired, separate discharge valves may be provided in each system. As shown, switch handles 47, 48 are pivoted on pins 45, 46, Figs. 1, 3, on a switch board 44 of the machine and are linked together by means of connecting rods 60, 66 and lost motion devices and springs operated by fingers 56, 57 on the pins 45, 46 to control shafts 40 ... 43 of valves 30 ... 33. These valves control respectively the delivery from the washing pump 17 to the washing spray system, the discharge from the washing pump, the delivery from the rinsing pump 18 to the rinsing spray system, and the discharge from the rinsing pump. The pumps 17, 18 and unitary driving motor 16 are mounted between the wings 14, 15 of a tank which is divided by partitions into two parts, one 12 for washing liquid and the other 13 for rinsing liquid. In the position of the fingers 56, 57 shown in Fig. 3; the machine is set for washing, the arm 50 corresponding to the open position of the suction valve of the washing pump and the arm 51 to the closed position of the discharge valve of this pump. The arm 52 corresponds to' the closed position of the suction valve 32 of the rinsing pump and the arm 53 to the open position of the discharge valve of this pump. In this position the machine is filled with liquid and washing takes place. For rinsing, the pin 45 is turned by its handle 47 in clockwise direction, causing the connecting rod 66 to move to the right by the finger 56 and all the arms 50 ... 53 to turn in clockwise direction, the arm 50 being turned by spring 54, arm 52 by nose 67 on connecting rod 66, and arm 53 by spring 55. As the arm 52 turns it moves the connecting rod 60 to the right, causing the arm 51 to be turned by the nose 64. The springs 54, 55 tend to move the valves 30, 33 towards their closed positions. When the machine is to be discharged, the valves are first set to washing position, shown in Fig. 3, and the pin 46 is then turned by its handle 48 in clockwise direction to move the finger 57 into contact with an arc-shaped surface 75 on a projection 58 on the connecting rod 60. The centre of this surface coincides with that of the pin 46 so that the rod 60 is locked in position. The arm 51 of discharge valve 31 of the washing pump and arm 52 of suction valve 32 of rinsing pump are moved into open position against the springs 54, 55, the other ends of these springs being locked. The suction valve 30 of washing pump and discharge valve of rinsing pump are open in the washing position of the machine so that all valves are thus open, causing machine to be emptied The pumps may be permanently connected to the electric motor and since, in the washing position, the discharge valve 33 of the rinsing pump is open and, in the rinsing position, the corresponding valve 31 of washing pump is open, the respective impellers rotate idly when not pumping.