Patent ID: 7108418

Claim:
An auger mixer for mixing a concrete mix comprising: an elongated mixer housing having a first end and a second end, the mixer housing having a mixing chamber for mixing the concrete mix therein; a mixing auger disposed in the mixing chamber and having an auger shaft, the auger shaft having a longitudinal shaft axis extending from the first end to the second end of the mixer housing; a power source connected to the mixing auger for rotating the mixing auger about the longitudinal shaft axis of the shaft; the mixer housing having a first end wall adjacent the first end of the housing; a bearing assembly mounting one end of the auger shaft to the first end wall of the housing for rotation relative to the first end wall about the shaft axis; a seal assembly comprising a stationary seal remaining stationary relative to the first end wall and a rotating seal rotating in unison with the auger shaft when the auger shaft rotates about the auger shaft axis; the stationary seal including a stationary contact surface and a resilient stationary member; the rotating seal including a rotating contact surface and a resilient rotating member; the resilient stationary member and the resilient rotating member each being deformed and biasing the stationary seal and the rotating seal toward one another so that the stationary contact surface of the stationary member frictionally engages the rotating contact surface of the rotating member; the stationary contact surface and the rotating contact surface forming a seal there between during rotation of the rotating contact surface relative to the stationary contact surface to prevent the concrete mix from exiting the mixing chamber and moving toward the bearing assembly.