Patent GB-776099-A (GB)
Title: Improvements in or relating to machines in washing dishes or other articles
IPC: A47L15/46
Filed: 1955-05-19
Abstract: 776,099. Dishwashing machines. ASPLUND, A. J. A. May 19, 1955, No. 14440 /55. Class 138(1) [Also in Group XXIX] In a machine for washing dishes or other articles of the kind having an impeller driven by an electric motor and adapted to project washing liquid over the dishes, a switch 92 for the motor, a valve 20, Fig. 1, directly controlling the liquid supply and a control device 82 controlling the washing cycle, an auxiliary valve 56 is provided and adapted to determine the position of the valve 20 and the control device 82 is adapted upon a setting movement in one direction to control the machine by continuous movement in the,opposite direction without any actuation from the motor so that the machine performs a washing cycle including one washing step and at least one rinsing step, the device 82 carrying a single body 80 formed with cams 100, 102, 104. Fig. 3, and partaking in the movements, the cams and intermediate depressions 106 forming a guiding surface for a follower assembly 78. 72. 86, Fig. 1, arranged for actuation of both the valve 56 and the switch 92. The apparatus shown in Fig. 1, is intended to be fitted to a dishwashing machine e.g. of the type disclosed in Specification 671,274 which is referred to. A main liquid supply valve housing 10 is connected by an adjustable throttling valve 46 with a pipe 44 connected to a water supply. The conical rubber valve 20 is disposed in the housing between two pressure chambers 14 and 28, and normally closes a seat 18 communicating a tube 62 coaxial with a tube 64 which is connected to the dishwashing machine (not shown), the annular space between the tubes 62, 64 being connected to a chamber 58 outside the housing 10. The pressure chamber 14 is connected by a passage 40 to the throttling valve 46 and the pressure chamber 28 also connects with the valve. 46 through a passage 36, space 32 and passage 38 leading into the passage 40. The pressure chamber 28 also communicates by a passage 34 with a space 30, the latter connecting with the chamber 58 through the valve 56 which is normally closed. The valve 56 is mounted on one end of a leve arm 66 pivoted at 68, the other end of the arm having mounted thereon, for longitudinal adjustment by nuts 74, a rod 72. One end of the rod 72 engages a wheel 86 mounted on the end of a spring blade 90 secured at its other end 94 to the microswitch 92 which controls the motor for the dishwashing impeller. The blade 90 coacts with the switch pin 96. The other end of the rod 72 is provided with a, wheel 78 to engage the end surface of the rotatable control body 80, Fig. 3, having elevated cam portions 100, 102 and 104 and intermediate depressions 106. The body 80 is rotatable by a spring-driven timing means 82. A lever arm 84 on the body is provided so that the body may be rotated in one direction to load the spring bf the timer 82 and at the same time cause the widest cam 100 to engage the wheel 78. When the lever arm 84 is released the timer rotates the body 80 in the opposite direction so that the depressions 106 and cams 102, 104 alternately engage the wheel 78. When the cain 100 engages the wheel 78 the rod 72 is moved to the right so that the switch pin 96 is actuated to energize the impeller motor. At the same time the valve 56 is opened and liquid can flow thereby into the chamber 58. The pressure differential in the chambers 14, 28 causes the main valve 20 to open so that liquid is delivered through the tubes 62, 64 to the dishwashing machine and liquid is drawn from the chamber 58 by ejector action. Clearly when the wheel 78 enters a depression 106 on the body 80, the switch 92 will be opened and the valve 56 will close whereafter the valve 20 will close since there is no longer a pressure differential in the chambers 14, 28. The widest cam 100 corresponds to a washing step and the cams 102, 104, correspond to two shorter rinsing steps.