Grinder for grinding coffee beans as well as coffee machine comprising such a grinder

Patent metadata

Field	Value
Publication number	US-9867502-B2
Application number	US-201514823387-A
Country	US
Kind code	B2
Filing date	Aug 11, 2015
Priority date	Aug 12, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

What is described is a new grinder, which serves to grind coffee beans and which is embodied as disk grinder. To improve the grinding process, the first and/or second grinding disk, respectively, encompass grinding surfaces that may define an angle of inclination, which may be in each case greater than 90° and smaller than 180°, relative to a tool reference plane.

First claim

The invention claimed is:

1. A grinder, which serves to grind coffee beans, comprising:
a first grinding disk, which has a number of teeth, which are spaced apart from one another and which are separated from one another by grinding grooves and which in each case encompass a grinding edge and a first grinding surface, which adjoins the grinding edge,
a second grinding disk, which has a number of teeth, which are spaced apart from one another and which are separated from one another by grinding grooves and which in each case encompass a grinding edge and a second grinding surface, which adjoins the grinding edge,
wherein the first grinding disk and the second grinding disk are arranged coaxially along a common axis of rotation by forming a grinding slit, which extends between the first grinding disk and the second grinding disk and which in each case extend substantially vertically to the common axis of rotation,
wherein the first grinding disk and the second grinding disk are configured to be rotated relative to one another about the common axis of rotation, so that, in response to a rotation of the first grinding disk relative to the second grinding disk, each of the first grinding surfaces of the first grinding disk is in each case moved in a grinding direction relative to the second grinding disk, so as to transport the coffee beans, which are to be ground, from an entrance slit of the grinder in the grinding grooves through the grinding slit to an exit slit, and to comminute them by means of the first grinding surfaces of the first grinding disk, wherein each first grinding surface of the first grinding disk is arranged such that it defines one of the grinding grooves of the first grinding disk at a rear side of the respective grinding groove relative to the grinding direction,
wherein each first grinding surface of the first grinding disk encompasses an angle of inclination φ at an arbitrary point at the respective first grinding surface, relative to a tool reference plane, measured at an assumed working plane in the grinding direction of the respective first grinding surface,
wherein the tool reference plane is a plane in the arbitrary point, which is embodied parallel to the grinding direction and vertically to the axis of rotation, and wherein
the assumed working plane is a plane, which is oriented parallel to the axis of rotation and parallel to the grinding direction, through the arbitrary point, and
wherein the angle of inclination φ of at least one of the first grinding surfaces of the first grinding disk fulfills the following condition: 90°<φ<180°.

2. The grinder according to claim 1 wherein the number of the teeth of the first grinding disk and/or of the second grinding disk is arranged so as to be distributed evenly across its respective circumference.

3. The grinder according to claim 1 wherein the first grinding disk and/or the second grinding disk encompasses a number of teeth, which differs from one another.

4. The grinder according to claim 1 wherein the number of the teeth of the first grinding disk and/or of the second grinding disk increases from the entrance slit of the respective grinder to the exit slit thereof.

5. The grinder according to claim 1 , wherein the height of the teeth of the first grinding disk and/or of the second grinding disk decreases from the entrance slit of the respective grinder to the exit slit thereof.

6. The grinder according to claim 1 , wherein the angles of inclination φ of the first grinding disk and/or of the second grinding disk differ from one another.

7. The grinder according to claim 1 , wherein the teeth of the first grinding disk and/or of the second grinding disk are in each case arranged spirally in the direction of the axis.

8. The grinder according to claim 7 , wherein the teeth of the first grinding disk and/or of the second grinding disk are in each case arranged as logarithmic spiral in the direction of the axis.

9. A coffee machine comprising a grinder according to claim 1 .

10. A grinder, which serves to grind coffee beans, comprising:
a first grinding disk, which has a number of teeth, which are spaced apart from one another and which are separated from one another by grinding grooves and which in each case encompass a grinding edge and a first grinding surface, which adjoins the grinding edge,
a second grinding disk, which has a number of teeth, which are spaced apart from one another and which are separated from one another by grinding grooves and which in each case encompass a grinding edge and a second grinding surface, which adjoins the grinding edge,
wherein the first grinding disk and the second grinding disk are arranged coaxially along a common axis of rotation by forming a grinding slit, which extends between the first grinding disk and the second grinding disk and which in each case extend substantially vertically to the common axis of rotation,
wherein the first grinding disk and the second grinding disk are configured to be rotated relative to one another about the common axis of rotation, so that, in response to a rotation of the second grinding disk relative to the first grinding disk, each of the second grinding surfaces of the second grinding disk is in each case moved in a grinding direction relative to the first grinding disk, so as to transport the coffee beans, which are to be ground, from an entrance slit of the grinder in the grinding grooves through the grinding slit to an exit slit, and to comminute them by means of the second grinding surfaces of the second grinding disk, wherein each second grinding surface of the second grinding disk is arranged such that it defines one of the grinding grooves of the second grinding disk at a rear side of the respective grinding groove relative to the grinding direction,
wherein each of the second grinding surfaces of the second grinding disk encompasses an angle of inclination φ at an arbitrary point at the respective second grinding surface, relative to a tool reference plane, measured at an assumed working plane in the grinding direction of the respective second grinding surface,
wherein the tool reference plane is a plane in the arbitrary point, which is embodied parallel to the grinding direction and vertically to the axis of rotation, and wherein
the assumed working plane is a plane, which is oriented parallel to the axis of rotation and parallel to the grinding direction, through the arbitrary point, and
wherein the angle of inclination φ of at least one of the second grinding surfaces of the second grinding disk fulfills the following condition: 90°<φ<180°.

11. The grinder according to claim 10 , wherein the number of the teeth of the first grinding disk and/or of the second grinding disk is arranged so as to be distributed evenly across its respective circumference.

12. The grinder according to claim 10 , wherein the first grinding disk and/or the second grinding disk encompasses a number of teeth, which differs from one another.

13. The grinder according to claim 10 , wherein the number of the teeth of the first grinding disk and/or of the second grinding disk increases from the entrance slit of the respective grinder to the exit slit thereof.

14. The grinder according to claim 10 , wherein the height of the teeth of the first grinding disk and/or of the second grinding disk decreases from the entrance slit of the respective grinder to the exit slit thereof.

15. The grinder according to claim 10 , wherein the angles of inclination φ of the first grinding disk and/or of the second grinding disk differ from one another.

16. The grinder according claim

Assignees

• Jura Elektroapparate Ag

Inventors

• Sahli Georg
• Probst Stephan
• Büttiker Philipp

Classifications

• A47J42/20

  Grinding discs · CPC title

• A47J31/42 Primary

  Beverage-making apparatus with incorporated grinding or roasting means for coffee {(coffee mills A47J42/00; coffee roasters in general A23N12/08)} · CPC title

• A47J42/12

  having grinding discs · CPC title

• A47J42/02

  having grinding cones · CPC title

• A47J42/10 Primary

  Grinding cones · CPC title