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US 4,607,200 AGranted
Coffee grinder
AssigneeBunn-O-Matic Corporation
InventorJohn D. Zimmerman
Life of this patent
Estimating the term…
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AssigneeBunn-O-Matic Corporation
InventorJohn D. Zimmerman
Estimating the term…
A coffee grinder has a control circuit for its electric grinder motor which includes a three-position control switch having a resident "Off" position, a resident "On" position, and a non-resident or momentary "On plus Start" position. In the "Off" position power is interrupted to all circuits of the grinder. The "On" position is a resting position which is resumed after the start of each grind cycle in readiness for the start of another grind cycle. The "On plus Start" position is momentary and in which a relay is energized so as to complete a circuit that energizes the grinder motor. In one type of coffee grinder the electrical control circuit includes a timer which can be set to determine the length of the grinding cycle. In another type of coffee grinder the length of the grinding cycle is determined by the presence of a ground coffee receiving bag or other container. In both types of grinders the normal grinding cycle can be terminated by placing control switch in its "Off" position.
In a coffee grinder having an electric grinder motor, a three-mode control circuit for energizing and deenergizing said motor, comprising, in combination, a three-condition control switch, a relay having at least one pair of openable and closable contacts, and conductors electrically interconnecting said motor, control switch and relay with a source of electric power, said control switch having (1) an "Off" condition in which it will reside until positively manipulated to another condition and in which said control circuit is completely de-energized, (2) an "On" condition in which it will reside until positively manipulated to another condition, and (3) a "On plus Start" condition wherein it actuates said relay and which it will occupy only so-long as manually retained therein and which upon release automatically resumes said "On" condition.
Dependencies are inferred from the claim text.