Electromechanical controller for dishwasher with alternating flow
First Claim
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1. A washer, comprising:
- two sprayers for spraying fluid;
a pump for delivering fluid to the sprayers;
a valve for controlling flow from the pump to the sprayers so as to alternate fluid flow between the sprayers;
a controller adapted for stopping and starting the pump thereby controlling the valve to alternate flow of fluid to the sprayers, said controller comprising;
a switch connected to energize the pump;
a first timer wheel adapted to operate the switch so as to energize the pump for a certain period of time; and
a second timer wheel adapted to override the first timer wheel to operate the switch to deenergize the pump for a certain period of time.
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Accused Products
Abstract
A dishwasher is provided with a valve for alternating flow to upper and lower spray arms during washing. The valve is controlled by periodic interruption of the pump for certain lengths of time. An electromechanical timer has a main cam wheel and an auxiliary cam wheel. The main cam wheel controls the pump and other parts of the dishwasher. The auxiliary cam wheel overrides the main cam wheel control of the dishwasher to provide the periodic lobes.
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Citations
12 Claims
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1. A washer, comprising:
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two sprayers for spraying fluid; a pump for delivering fluid to the sprayers; a valve for controlling flow from the pump to the sprayers so as to alternate fluid flow between the sprayers; a controller adapted for stopping and starting the pump thereby controlling the valve to alternate flow of fluid to the sprayers, said controller comprising; a switch connected to energize the pump; a first timer wheel adapted to operate the switch so as to energize the pump for a certain period of time; and a second timer wheel adapted to override the first timer wheel to operate the switch to deenergize the pump for a certain period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A washer, comprising:
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a wash tub having a sump in a lower part thereof; two sprayers for spraying washing liquid on objects in the tub; a pump for delivering liquid from the sump to the sprayers; a valve arranged for controlling flow from the pump to the sprayers so that lobes in liquid flow from the pump cause the valve to alternate liquid flow between the spray arms; a controller adapted for energizing and deenergizing the pump thereby controlling the valve to alternate flow of liquid to the sprayers, said controller comprising; a switch including a first arm having a first electrical contact and a cam follower, and a second arm having a second electrical contact, said switch being connected to energize the pump when the contacts are engaged to close the switch; a first timer wheel adapted for rotation and having a plurality of gaps and lobes adapted operate the cam follower to close and open the switch so as to energize and deenergize the pump for certain periods of time; and a second timer wheel adapted for rotation and having a lobe adapted to operate the switch to override the first timer wheel to open the switch to deenergize the pump for a certain period of time. - View Dependent Claims (11)
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12. A washer, comprising:
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a wash tub having a sump in a lower part thereof; upper and lower spray arms for spraying washing liquid on objects in the tub; a pump for delivering liquid from the sump to the spray arms; two conduits in communication between the pump and respective spray arms; a valve arranged for controlling flow from the pump to the spray arms so that lobes in liquid flow from the pump cause the valve to alternate liquid flow between the spray arms, said valve comprising a ball adapted to block one of the two conduits, said valve being adapted to move the ball from one conduit to the other when water flow to the valve is interrupted; a controller adapted for operating and interrupting operation of the pump thereby controlling the valve to alternate flow of liquid to the sprayers, said controller comprising; a switch including a first arm having a first electrical contact, a cam follower, and an appendage, and a second arm having a second electrical contact, said switch being connected to energize the pump when the contacts are engaged to close the switch; a first cam wheel adapted for rotation on a first axis and having a plurality of gaps and lobes adapted operate the cam follower to close and open the switch so as to energize and deenergize the pump for certain periods of time; a lever having an end adapted to operate the appendage; and a second cam wheel adapted for rotation on a second axis and having a lobe adapted to operate the lever to override the first cam wheel to open the switch to deenergize the pump for a certain period of time.
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Specification