Grain grinder

Claim 2

In a grain grinder comprising a housing and a stator stone, the improvement comprising a rotor stone having a grinding portion and a feeDing portion, said feeding portion being in open communication with a supply of grain and having at least one groove of substantially uniform width therein adapted to assist the transportation of said grain from said feeding portion to said grinding portion, said groove beginning at a point adjacent but spaced from the central opening of the stone and spiraling toward the periphery of the stone, and power means for rotating the rotor stone relative to the stator stones.

Claim 3

A grain grinder as defined in claim 1 wherein said stator stone comprises: a central opening through which grain is supplied to the feeding portion of the rotor stone, a first surface extending about the periphery of said opening and tapering outwardly from said opening at a relatively steep angle, a second surface extending about the periphery of said first surface and tapering outwardly from said first surface at a relatively moderate angle, and a third surface extending about the periphery of said second surface normal to the axis of said opening.

Claim 4

In a grain grinder as defined in claim 2, wherein said rotor stone further comprises blower means comprising a plurality of turbine blades radially spaced around the periphery of the rotor stone to assist in transporting grain product after it has been ground.

Claim 5

In a grain grinder having a housing, a stator stone and a rotor stone, the improvement comprising an axially displaceable mounting plate upon which the stator stone is mounted, the weight of the plate being carried by the housing and externally adjustable means comprising a single screw rotatably secured to the housing and threadedly engaging the stator stone mounting plate so as to axially displace the mounting plate and thereby vary the clearance between the stator stone and the rotor stone when the screw means is rotated.

Claim 6

In a grain grinder having a housing, a stator stone and a rotor stone, the improvement comprising an axially displaceable mounting plate upon which the stator stone is mounted, the weight of the plate being carried by the housing and externally adjustable means comprising a single screw rotatably secured to the housing and threadedly engaging the stator stone mounting plate so as to axially displace the mounting plate and thereby vary the clearance between the stator stone and the rotor stone when the screw means is rotated.

Claim 7

A grain grinder as defined in claim 4 wherein said screw means comprise a handle-pointer manually displaceable to rotate the screw means and an indicator plate having indicia thereon to visually indicate the clearance between said stones.

Claim 8

In a grain grinder as defined in claim 5 wherein said indicating plate is adjustable relative to the stator stone to accommodate calibration between the separation of the rotor and stator stones and the indicia.

Claim 9

In a grain grinder as defined in claim 4 wherein said adjustable means further comprises locking means to maintain a predetermined clearance between the stator and rotor stones.

Claim 10

In a grain grinder as defined in claim 4 wherein said mounting plate comprises a chute portion adapted to feed grain from a grain source to the clearance between the rotor and stator stones.

Claim 11

A grain grinder comprising a housing, a rotor stone mounted for rotation in a vertical plane, means for rotating the stone, a stator stone spaced from and in general alignment with the rotor stone, means coupled to the stator stone for delivering grain through an opening in the stator stone to a grinding location between the stator and rotor stones, and externally adjustable means for varying the space between the rotor and stator stones, said adjustable means comprising horizontally oriented screw means rotatable to axially displace the stator stone relative to the rotor stone, said rotor stone having at least one groove in the grinding face thereof to generally uniformly distribute grain to the periphery of the rotor stone for grinding, said stator stone having a tapered surface extending outwardly about the periphery of said opening and a second surface extending about the periphery of said tapered surface normal to the axis of said opening in facing relation with the grooved surface of said rotor stone.

Claim 12

A grain grinder comprising a housing, a rotor stone mounted for rotation in a vertical plane, means for rotating the stone, a stator stone spaced from and in general alignment with the rotor stone, means coupled to the stator stone for delivering grain through an opening in the stator stone to a grinding location between the stator and rotor stones, and externally adjustable means for varying the space between the rotor and stator stones, said adjustable means comprising horizontally oriented screw means rotatable to axially displace the stator stone relative to the rotor stone, said rotor stone having at least one groove in the grinding face thereof to generally uniformly distribute grain to the periphery of the rotor stone for grinding, said stator stone having a tapered surface extending outwardly about the periphery of said opening and a second surface extending about the periphery of said tapered surface normal to the axis of said opening in facing relation with the grooved surface of said rotor stone.