Patent ID: 8161872

Claim:
An automatic juicer comprising: a lid openable to allow fruit to be placed in the juicer; a base containing a motor; a center column assembly attached to the base and comprising: an outer column fixed to the base; a hollow vertical drive shaft residing in the outer column, turned by the motor, and vertically fixed and including a threaded cylindrical exterior and at least one vertical keyway reaching radially through the hollow vertical drive shaft; and a driven shaft which rotates with the drive shaft and advances vertically with respect to the drive shaft and including at least one protruding key for cooperation with the vertical keyway in the drive shaft to cause the driven shaft to rotate with the driveshaft; a nut resides inside the outer column and on the threaded cylindrical exterior of the drive shaft, the nut including internal threads for cooperation with the threaded cylindrical exterior of the drive shaft and the nut cooperating with the fixed outer column to prevent the nut from rotating causing the nut to advance and retreat vertically when the drive shaft rotates, the protruding key of the driven shaft resting on top of the nut, wherein the vertical advancing of the nut lifts the driven shaft; a bowl attached to the base; and a juicing cone attached to the driven shaft and rotates and advances vertically with the driven shaft, for rotating and pushing into a fruit for releasing juice from the fruit to be caught in the bowl.