Grinding burrs for coffee bean grinders

A pair of grinding burrs for use in a coffee grinder comprising

• a stationary disk and a rotary disk, each of said disks having a multiplicity of teeth arranged in stages about the center of said disk, one of said disks having its multiplicity of teeth adapted to nest among the multiplicity of teeth of said other disk,
• each of said disks having
• a first stage of said teeth comprising at least four teeth aligned in a circular row about said center and spaced apart a distance at least greater than the average diameter of coffee beans to be ground,
• a second stage of said teeth aligned in at least one circular row about said center and spaced outwardly from said first stage;
• and
• a third stage of teeth of said aligned in at least one circular row about said center and spaced outwardly from said second stage, the width of the gaps between each tooth measured from each lateral surface thereof to the lateral face of associated nested teeth becoming progressively smaller from the innermost row of teeth in said first stage to the outermost row in said third stage.

A pair of grinding burrs for use in a coffee grinder comprising

• a stationary disk and a rotary disk, each of said disks having a multiplicity of teeth arranged in stages about the center of said disk, one of said disks having its multiplicity of teeth adapted to nest among the multiplicity of teeth of said other disk,
• each of said disks having
• a first stage of teeth comprising at least four teeth aligned in a circular row about said center and spaced apart a distance at least greater than the average diameter of coffee beans to be ground,
• a second stage of teeth aligned in at least one circular row about said center and spaced outwardly from said first stage,
• a third stage of teeth aligned in at least one circular row about said center and spaced outwardly from said second stage,
• each of said teeth having a triangularly shaped leading surface forming a first apex, a triangularly shaped trailing surface forming a second apex, and a pair of lateral surfaces converging to form a line of intersection between said apices,
• said leading faces of the teeth forming lines of intersection with the surface of its associated grinding burr that are coextensive with lines of intersection formed by the leading faces of the next outer row, said lines of intersection forming a continuous straight lines from the innermost row located in said first stage to the outermost row in said third stage, said outer stages of teeth forming V-shaped radial valleys defined by said leading surfaces and trailing surfaces with said continuous straight lines extending along the bottoms of said radial valleys, the sum of the skew angles of said one disk and said other disk being between about 95.degree. to 100.degree..

A pair of grinding burrs for use in a coffee grinder comprising

• a stationary disk and a rotary disk, each of said disks having a multiplicity of teeth arranged in stages about the center of said disk, one of said disks having its multiplicity of teeth adapted to nest among the multiplicity of teeth of said other disk,
• each of said disks having
• a first stage of teeth comprising at least four teeth aligned in a circular row about said center and spaced apart a distance at least greater than the average diameter of coffee beans to be ground,
• a second stage of teeth aligned in at least one circular row about said center and spaced outwardly from said first stage,
• a third stage of teeth aligned in at least one circular row about said center and spaced outwardly from said second stage,
• each of said teeth having a triangularly shaped leading surface forming a first apex, a triangularly shaped trailing surface forming a second apex, and a pair of lateral surfaces converging to form a line of intersection between said apices,
• said leading faces of teeth in each row forming lines of intersection with the surface of its associated grinding burr that are coextensive with lines of intersection formed by the leading faces of the next outer row, said lines of intersection forming a continuous straight lines from the innermost row to the outermost row, said outer stages of teeth forming V-shaped radial valleys defined by said leading surfaces and trailing surfaces with said continuous straight lines extending along the bottoms of said radial valleys,
• said teeth in said adjacent rows forming tangential valleys therebetween, and
• said radial valleys between teeth in a row located near the periphery of said disk being at least as deep as the tangential valley formed by said peripheral row with the next inner adjacent row.

A pair of grinding burrs for use in a coffee grinder comprising

• a stationary disk and a rotary disk, each of said disks having a multiplicity of teeth arranged in stages about the center of said disk, one of said disks having its multiplicity of teeth adapted to nest among the multiplicity of teeth of said other disk,
• each of said disks having
• a first stage of teeth comprising at least four teeth aligned in a circular row about said center and spaced apart a distance at least greater than the average diameter of coffee beans to be ground;
• a second stage of teeth aligned in at least one circular row about said center and spaced outwardly from said first stage;
• and
• a third stage of teeth aligned in at least one circular row about said center and spaced outwardly from said second stage, each of said teeth having a triangularly shaped leading surface forming a first apex, a triangularly shaped trailing surface forming a second apex, and a pair of lateral surfaces converging to form a line of intersection between said apices, said leading surface being at a slope angle of between about 15.degree. and 30.degree. to the vertical of said disk and said trailing surface being at a slope angle of between about 40.degree. to 60.degree. to the vertical of said disk wherein the width of the gaps between each tooth measured from each lateral surface thereof to the lateral face of associated nested teeth become progressively and constantly smaller from the inner most row of teeth to the outer most row in said third stage.