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US Patent: 6,402,360
Internal Batch Mixing Machines and Rotors
Narku O. Nortey - Erie, Erie County, PA

USPTO Classifications:
366/84, 366/85, 366/88

Tool Categories:
specialty machines : mixing machines

Skinner Engine Co. - Erie, Erie County, PA

Not known to have been produced


Patent Dates:
Applied: Mar. 25, 1999
Granted: Jun. 11, 2002

Patent Pictures:
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"Vintage Machinery" entry for Skinner Engine Co.

An internal batch mixing machine includes a mixing chamber having a pair of cavities in which a first and a second rotor are mounted adjacent one another and are driven in opposite directions to mix material. The circumference of each rotor is divided into first, second, third and fourth sequential quadrants spaced in a direction opposite to the intended direction of rotation of that rotor. Each of the rotors has preferably a pair of lobes or wings located in every other quadrant of that rotor, although three lobe rotors are possible. Each lobe has a leading end and a trailing end. The first rotor has a pair of lobes located in its first and third quadrants, while the second rotor has a pair of lobes located in its second and fourth quadrants. One of the lobes of each pair of lobes is longer than the other, and each lobe extends downstream at an acute cohelix angle toward the other lobe of its pair. The long lobe of each pair of lobes has its leading end at or near the axial end of its rotor, and a short lobe of each pair of lobes has its leading end at the other axial end of the rotor. Long lobes in the second and fourth quadrant of the second rotor have their leading ends, respectively, at or near the axial ends of the second rotor which are opposite from the axial ends at which long lobes in the first and third quadrant have their leading ends. The lobes of each pair of lobes have respective lengths, locations of origin within the rotor quadrant in which they are located and acute cohelix angles at which they extend so as to cause material adjacent the longer of the lobes of each pair of lobes to be pushed away from the axial end of the rotor at or near which its leading end is located and toward the other end of that rotor, and to form a space between the trailing ends of each pair of lobes having a size which causes confluent material at the space to be squeezed between the trailing ends of both lobes of each pair of lobes and to flow out of that space, thereby releasing the squeezed material and adding turbulence to further mix the material.

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