Grain milling wheels
AssigneePioneer Associates
InventorRobert G. Coucher
Life of this patent
Estimating the term…
Abstract
A matched pair of milling wheels for use in home grain mills includes a stator and a rotor. Each wheel is ideally composite, with a metal casting supporting a peripheral ring of cast stone. When the wheels are mounted in a mill with their peripheral grinding surfaces juxtaposed, their interior sections define a central cavity which functions as a crushing section. The crushing section contains opposed cutting teeth constituting means for primary shearing and grooves spaced between the cutting teeth constituting means for secondary shearing action. The grooves also provide access for grain particles to migrate out toward the grinding interface between the peripheral cast stone rings.
Claims18
In a set of milling wheels for home grain mills comprising a rotor adapted for mounting on a driven shaft with the milling surface of the rotor facing out from the end of the shaft and a stator adapted for mounting with its milling surface juxtaposed in registration with the milling surface of the rotor so that the registered milling surfaces together define a central cavity adapted to receive grain from an outside supply and to reduce said grain to grain particles as the rotor turns on its axis and a peripheral interface adapted to grind said particles to flour as they are urged from said central cavity outward by the spinning rotor, the improvement which comprises:
- a stator with a central bore to admit grain to said central cavity and a milling surface within said cavity including evenly spaced cutting teeth radiating from the proximity of the peripheral interface inward, each said tooth having a milling surface comprising a leading ramped portion with a rake angle;
- and
- a rotor with a milling surface within said central cavity including evenly spaced cutting teeth, of a number different from the number of such teeth associated with the stator, radiating from the proximity of the peripheral interface inward, each said tooth having a milling surface comprising a leading ramped portion with a rake angle;
- the leading ramped portion of said stator teeth being opposed to the leading ramped portion of said rotor teeth so that grain is crushed between said ramped portions as the rotor turns on its axis.
In a set of milling wheels for home grain mills comprising a rotor adapted for mounting on a driven shaft with the milling surface of the rotor facing out from the end of the shaft and a stator adapted for mounting with its milling surface juxtaposed in registration with the milling surface of the rotor so that the registered milling surfaces together define a central cavity adapted to receive grain from an outside supply and to reduce said grain to grain particles as the rotor turns on its axis and a peripheral interface adapted to grind said particles to flour as they are urged from said central cavity outward by the spinning rotor, the improvement which comprises each wheel being constructed of:
- a metal base element approximately the full diameter of said wheel and including that wheel's portion of said central cavity enclosed within a rim with internal crushing structure contained within the cavity and approximately coplaner with said rim and a peripheral shoulder portion recessed with respect to said rim;
- and
- a cast stone ring bonded to said recessed shoulder portion so that the grinding surface of said ring extends to at least the milling surface of said rim but not more than about 0.005 inch beyond said rim.
In a set of milling wheels for home grain mills comprising a rotor adapted for mounting on a driven shaft with the milling surface of the rotor facing out from the end of the shaft and a stator adapted for mounting with its milling surface juxtaposed in registration with the milling surface of the rotor so that the registered milling surfaces together define a central cavity adapted to receive grain from an outside supply and to reduce said grain to grain particles as the rotor turns on its axis and a peripheral interface adapted to grind said particles to flour as they are urged from said central cavity outward by the spinning rotor, the improvement which comprises each wheel being constructed of:
- a metal base element approximately the full diameter of said wheel and including that wheel's portion of said central cavity enclosed within a rim and a peripheral shoulder portion recessed with respect to said rim;
- a cast stone ring bonded to said recessed shoulder portion so that the grinding surface of said ring extends to at least the milling surface of said rim;
- and
- wherein the stator has a central bore to admit grain to said central cavity and a milling surface within said cavity including evenly spaced cutting teeth radiating from the proximity of the peripheral interface inward, each said tooth having a milling surface comprising a leading ramped portion with a rake angle, and the rotor has a milling surface within said central cavity including evenly spaced cutting teeth, of a number different from the number of such teeth associated with the stator, radiating from the proximity of the peripheral interface inward, each said tooth having a milling surface comprising a leading ramped portion with a rake angle opposed to the leading ramped portion of said rotor teeth so that grain is crushed between said ramped portions as the rotor turns on its axis.
Dependencies are inferred from the claim text.