Abstract: A grinder for coffee beans, comprising a hopper, two grinding burrs arranged for relative rotation about a vertical axis, and a chamber defined by walls including an outer wall and a lower plate, which has two outlets. At each outlet, a flexible blade mounted to such outlet closes such outlet until coffee grounds in the chamber are pressed downwardly with sufficient force to flex the blade. A rotor arranged to sweep in the chamber has portions having inclined faces whereby grounds being swept tend to be downwardly pressed. Each outlet is configured to direct grounds downwardly and radially. The outer wall is relieved to define two spiral configurations countering tendencies of the grounds to rotate as an annular mass.

Abstract: A coffee grinder useful in business offices or small restaurants. A hopper for coffee beans has an outlet in its lower wall. A motor is mounted vertically within the hopper. A stationary grinding burr and a rotatable grinding burr, which is driven by the motor via a vertical shaft extending through the outlet, cooperate to grind such beans into smaller grounds and to expel such grounds radially and horizontally between the burrs. A wall having an aperture surrounds the burrs and prevents such grounds from being expelled except through the aperture. A deflector mounted to the wall, outside the aperture, deflects such grounds downwardly in a concentrated stream.

Abstract: A grinding machine comprised of adjustable grinding mechanism for grinding material into preselected sized grounds. The grinding mechanism includes a stationary grinding burr and a grinding burr affixed to an axially adjustable rotor assembly. The rotor assembly includes on its face opposite to where the grinding burr is located a vane assembly which is designed to insure that any of the ground material that seeks to move into the cavity in which the vaned portion of the rotor and other adjustable mechanisms are located is evicted from said cavity to prevent fouling of the adjustable mechanisms located therein.

Abstract: A discharge chute unit is provided for attachment to a coffee grinder which has a discharge opening in the underside of a grinding chamber. The upper end of the discharge chute unit is mounted under the discharge opening and provided with de-chaffing the de-plugging means. A baffle is pivotally mounted in the upper end of the chute unit below the de-chaffer and de-plugger and normally biased in a position to deflect the flow of ground coffee and chaff toward the back side or rear wall of the chute member. The free discharge of chaff into the chute unit is prevented by a de-chaffer having reed-like de-chaffing members which yieldably obstruct the inlet opening into the chute unit without overly interfering with the discharge and flow of ground coffee from the grinding chamber into the chute unit.

Abstract: A coffee grinder-mixer assembly and method for alternatively producing high yield coffee and regular yield coffee comprising a grinding head, an elongated mixer box, a first elongated shaft mounting auger means and supported for rotation in the mixer box, second elongated shaft concentric with the first shaft for rotation relative to the first shaft, a plurality of paddles mounted on the second shaft, and means for alternatively co-rotating and counter-rotating the first shaft and the second shaft, relative to the other, thereby alternatively to produce high yield and regular yield coffees.