Coffee grinder device with feed worm and reversed grinding burr

Abstract

A coffee grinding apparatus for grinding coffee beans and distributing said beans into a basket for subsequent brewing of coffee having a pair of grinding disks where one of the disks is fixed to the housing and has an annular configuration with a central opening and the other disk further removed from the rotates with the drive shaft of the grinder motor. However, the rotating disk is mounted to the shaft so that it rotates with but is free to axially slide along the drive shaft. A coffee bean feed drive is mounted over the distal end of the drive shaft and moves coffee beans from the opening at the front end of the housing through the central opening of the stationary grinding burr. The feed drive is mounted to the shaft so that it rotates with but is also free to slide axially along the shaft. An adjusting mechanism is positioned adjacent to one end of the feed drive and functions to move the feed drive relative to the drive shaft. A biasing element yieldably biases the rotating burr in a direction toward the stationary grinding burr and the distal end of the drive shaft thereby causing the feed drive to continuously abut the adjusting mechanism. The yieldably biasing element permits the gap between burrs to widen during grinding in the event jamming is experienced.