Pump for coffee brewing device
AssigneeCorning Glass Works
InventorsGeorge M. Charbonneau, Leslie C. Cummings
Life of this patent
Estimating the term…
Abstract
A coffee maker pump for conveying fluid from a well area to a container for coffee grounds is provided with a restricted outlet opening for controlling the delivery of such fluid to the grounds in said container, and a by-pass opening intermediate the ends of said pump for relieving back pressure therewithin produced by said restriction. The amount of water which is supplied to the coffee grounds by said pump may be controlled by changing the size of the outlet restriction, or the size of the by-pass opening, or both thereby changing the back pressure in the pump stem which directly effects the amount of water delivered by the outlet end to the grounds retained within the container.
Claims5
An improved coffee maker pump assembly for controlling the volume of water delivered to coffee grounds for extracting a brew therefrom which comprises, a stem portion, a base portion connected to said stem portion adjacent one end thereof, a passageway extending longitudinally within said stem portion, inlet means adjacent said base portion for supplying water to said passageway, restricted outlet means formed in said stem portion and communicating with said passageway for controlling the volume of flow from said passageway delivered to coffee grounds retained exteriorly of said passageway during a brewing period and for simultaneously providing a back pressure within said passageway while delivering such flow from said outlet means, and relief means formed in said stem intermediate said restricted outlet means and said base portion for relieving back pressure within said passageway and for discharging fluid therefrom for flow countercurrent to flow within said passageway.
In a coffee maker for percolating coffee by forcing water from a container thereof upwardly through a pump for discharge into a basket containing coffee grounds wherein the water seeps through such grounds extracting the essence thereof as it flows downwardly into the container of water to form a coffee brew, the improvement comprising a pump assembly having a stem portion and a base portion, said base portion being connected to a bottom end of said stem portion, a passageway extending longitudinally within said stem portion, inlet means communicating with said passageway adjacent said base portion for supplying water to said passageway from a bottom portion of the container for said water, restricted outlet means formed in said stem portion and communicating with said passageway adjacent the top end of said stem portion for controlling the volume of water discharged by said passageway to coffee grounds contained within a basket positioned about an upper portion of said stem during a timed perking cycle and for providing back pressure within said passageway while simultaneously discharging said water to said coffee grounds, by-pass means formed in a side wall of said stem portion below said outlet means for relieving back pressure built up within said passageway by said restricted outlet means as water is discharged from said outlet means, and said by-pass means being positioned above the level of the water retained by said water container.
Dependencies are inferred from the claim text.