| 摘要 |
A coffee percolator includes conventional elements such as an electrical heating element, an on/off switch for energizing the heating element and a thermostatic switch for deactivating the heating element when the brewing coffee reaches a predetermined first temperature. The coffee percolator further includes a conventional pump and a coffee ground receptacle disposed in the upper portion of the inner chamber of the percolator. The invention resides in the inclusion of a temperature actuated pump for deactivating the pump when the temperature of the fluid in the inner chamber of the percolator is less than a second temperature. The second temperature is below the first temperature which activates the thermostatic switch. The temperature actuated pump control means includes an aperture disposed in the coffee pump to release fluid under pressure from the pump and thereby to disable the pump at low fluid temperatures. A thermostatically actuated valve closes off the aperture in the pump when the temperature of the fluid in the chamber exceeds the second temperature and uncovers the aperture when the temperature of the fluid in the chamber falls below the second temperature. In this manner only fluid having a temperature greater than the second temperature is pumped over the coffee grounds in the receptacle and the flow of heated fluid over the coffee grounds is terminated by the thermostatic switch when the temperature of the fluid reaches the first temperature.
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