Patent ID: 8348361

Claim:
A dispenser drawer and housing assembly, comprising: a housing including a first rail with first and second internal surfaces, a second rail with first and second internal surfaces, a first bearing fixture with first and second bearings, and a second bearing fixture with first and second bearings; and a dispenser drawer configured to contain one or more additives, to release the one or more additives upon introduction of liquid into the dispenser drawer, and for linear movement within the housing, the dispenser drawer including a first roller group including first and second rollers substantially inside the first rail and respectively in contact with the first and second internal surfaces of the first rail, wherein the first roller group comprises a third roller in contact with the first internal surface of the first rail, and wherein axes of rotation of the first and third rollers of the first roller group are in a first plane, an axis of rotation of the second roller of the first roller group is in a second plane, and the first plane is offset from the second plane, a second roller group including first and second rollers substantially inside the second rail and respectively in contact with the first and second internal surfaces of the second rail, a first surface generally parallel to a direction of the linear movement and in contact with the first bearing of the first bearing fixture, a second surface generally parallel to the direction of the linear movement and in contact with the second bearing of the first bearing fixture, a third surface generally parallel to the direction of the linear movement and in contact with the first bearing of the second bearing fixture, and a fourth surface generally parallel to the direction of the linear movement and in contact with the second bearing of the second bearing fixture.