Abstract: A coffee grinder has a housing that includes a ring burr, a shaft extending through the ring burr, a frustoconical burr, and an interlocking plug. An internal bore of the frustoconical burr has an upper cylindrical surface adjacent the top end, an interlocking portion adjacent the bottom edge, and a tapered side surface. The interlocking plug is shaped to extend through the internal bore of the frustoconical burr, and includes an upper cylindrical portion that fits through the upper cylindrical surface, and a lower portion that includes a sidewall surface which is also tapered such that the sidewall surface interlocks with the side surface of the frustoconical burr.

Abstract: A coffee grinder has a housing that includes a ring burr, a shaft extending through the ring burr to an end, the shaft having an axis of rotation, and a burr having an external surface, the burr having an internal bore that extends therethrough. The internal bore has a surface which is tapered with respect to the axis of the shaft. An interlocking plug is shaped to extend through the internal bore of the burr, the interlocking plug having a sidewall surface which is tapered with respect to the axis of the shaft, such that the sidewall surface abuts the surface of the burr to seat the interlocking plug within the burr. An adjustment knob engages the end of the shaft for locking the interlocking plug within the burr.

Abstract: A coffee grinder has a housing that includes a ring burr, a shaft extending through the ring burr, a frustoconical burr, and an interlocking plug. An internal bore of the frustoconical burr has an upper cylindrical surface adjacent the top end, an interlocking portion adjacent the bottom edge, and a tapered side surface. The interlocking plug is shaped to extend through the internal bore of the frustoconical burr, and includes an upper cylindrical portion that fits through the upper cylindrical surface, and a lower portion that includes a sidewall surface to which is also tapered such that the sidewall surface interlocks with the side surface of the frustoconical burr.

Abstract: A coffee grinder has a housing that includes a ring burr, a shaft extending through the ring burr, a frustoconical burr, and an interlocking plug. An internal bore of the frustoconical burr has an upper cylindrical surface adjacent the top end, an interlocking portion adjacent the bottom edge, and a tapered side surface. The interlocking plug is shaped to extend through the internal bore of the frustoconical burr, and includes an upper cylindrical portion that fits through the upper cylindrical surface, and a lower portion that includes a sidewall surface which is also tapered such that the sidewall surface interlocks with the side surface of the frustoconical burr.