Abstract: A mill for effecting in a particulate-containing substance a reduction in size of the particulate. The mill includes a support on which is rotatably mounted a vessel having a comminuting media contained therein. A shaft extends centrally of the vessel and is fixedly secured thereto to rotate with the vessel. Plural planar discs are secured to the shaft and extend in a plane transverse to the axis of rotation of the vessel. Planar blades are secured to both the disc and to the vessel so that the vessel, shaft, discs and blade means rotate as a unit. A spacing is provided between the radially outermost extremity of the blade means and the discs and the internal surface of the vessel. Deflector members are oriented in the spacing for deflecting media radially inwardly into engagement with the discs and blades so that the disc and blades can accelerate the comminuting media radially outwardly in response to a rotation of the vessel and connected discs and blades.

Abstract: A mechanical seal apparatus for use between a wall and a shaft extending through an opening in said wall with relative rotation occurring therebetween. The shaft extends from a first region at a first pressure into the opening in the wall and a second region at a second pressure. A seal element is positioned within the opening and has mutually contacting sealing faces. One annular seal member is fixed with respect to the wall and another annular seal member is fixed with respect to the shaft. The annular seal member is oriented at an exterior portion of the wall and has an outer diameter less than the diameter of the opening in the wall to define a gap therebetween. A bushing member is snugly received in the gap for preventing entry and collection of material into the gap. The bushing member has an axially facing surface facing away from said opening as well as radially outwardly of said shaft for repelling the material from entry into the gap.

Abstract: A mill for effecting in a particulate-containing substance a reduction in size of the particulate. The mill includes a support on which is rotatably mounted a vessel having a comminuting media contained therein. A shaft extends centrally of the vessel and is fixedly secured thereto to rotate with the vessel. Plural planar discs are secured to the shaft and extend in a plane transverse to the axis of rotation of the vessel. Planar blades are secured to both the disc and to the vessel so that the vessel, shaft, discs and blades rotate as a unit. A spacing is provided between the radially outermost extremity of the blades and the discs and the internal surface of the vessel. Deflector members are oriented in the spacing for deflecting media radially inwardly into engagement with the discs and blades so that the disc and blades can accelerate the comminuting media radially outwardly in response to a rotation of the vessel and connected discs and blades.