Exchangeable abrasive means for an abrasion appliance having a suction extraction arrangement

Patent metadata

Field	Value
Publication number	US-9821432-B2
Application number	US-201313965603-A
Country	US
Kind code	B2
Filing date	Aug 13, 2013
Priority date	Aug 13, 2012
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

An exchangeable abrasive mechanism or disc for use on abrasive-mechanism carriers having suction holes includes a plurality of through openings that each have a centroid. The through openings are differentiated into three groups that differ in the radial disposition of the centroids. A first group comprises at least one, but not more than four, through openings of a first cross section. At least two of the through openings of the first group are disposed on a first circumcircle diameter that is substantially identical to one of the hole-circle diameters such that, when the abrasive mechanism is correctly disposed on an abrasive-mechanism carrier, they are in direct alignment with and can overlap, two corresponding suction holes. A second group of through openings of a second, preferably smaller, cross section, comprises at least four through openings that are disposed on a second circumcircle diameter that differs from the first circumcircle diameter.

First claim

What is claimed is:

1. An exchangeable abrasive mechanism for use on an abrasive-mechanism carrier of an abrasion appliance that has suction holes, the abrasive-mechanism carrier having either five or eight circular suction holes that each have substantially a same diameter and are disposed either on a first, larger hole-circle diameter or a second, smaller hole-circle diameter on the abrasive-mechanism carrier, the abrasive mechanism comprising:
a body; and
a plurality of through openings formed in the body, each through opening having a cross-sectional area that defines a centroid, the plurality of through openings differentiated into three groups of through openings, the groups differing from each other in a radial disposition of the centroids of the respective through openings, the three groups including:
a first group of through openings having at least two, but not more than four, through openings of a first cross section, wherein at least two of the through openings of the first group are disposed on a first circumcircle diameter that is substantially identical to one of the hole-circle diameters such that, when the abrasive mechanism is correctly disposed on the abrasive-mechanism carrier, the at least two through openings are in direct alignment with two suction holes respectively assigned to them; and
a second group of through openings of a second cross section having at least four through openings that are disposed on a second circumcircle diameter that differs from the first circumcircle diameter.

2. The exchangeable abrasive mechanism according to claim 1 , wherein the second group comprises at least five through openings.

3. The exchangeable abrasive mechanism according to claim 1 , the three groups further including a third group of through openings, the centroids of the through openings of the third group being disposed neither on the first circumcircle diameter nor on the second circumcircle diameter.

4. The exchangeable abrasive mechanism according to claim 3 , wherein the third group comprises a plurality of through openings, the centroid of a first part of the plurality lying radially outside of the first circumcircle diameter, and a second part of the plurality lying radially inside the second circumcircle diameter, the through openings of the plurality disposed such that, when the abrasive mechanism is disposed on the abrasive-mechanism carrier, a cross-sectional area of each of the plurality of through openings is overlapped by a respective suction hole of the abrasive mechanism carrier.

5. The exchangeable abrasive mechanism according to claim 3 , wherein the third group comprises at least one through opening the centroid of which is disposed between the first circumcircle diameter and the second circumcircle diameter, a cross-sectional area of this through opening being overlapped by a suction hole assigned thereto, when the abrasive mechanism is correctly disposed on the abrasive-mechanism carrier, a cross section of the respective suction hole being touched by the cross-sectional area of the through openings such that the cross-sectional area of the respective through opening lies inside the cross section of the respective suction hole.

6. The exchangeable abrasive mechanism according to claim 1 , wherein the cross-sectional areas of at least one of the groups of through openings is circular.

7. The exchangeable abrasive mechanism according to claim 6 , wherein the cross-sectional areas of the through openings of the first group are circular and have a uniform first diameter.

8. The exchangeable abrasive mechanism according to claim 7 , wherein the first diameter of the through openings of the first group is between 70% and 105% of the diameters of the suction holes of the abrasive-mechanism carrier.

9. The exchangeable abrasive mechanism according to claim 6 , wherein the cross-sectional areas of the through openings of the second group are circular and have at least one differing diameter, the second group including at least two sub-groups of through openings that differ in a diameter of the cross-sectional areas.

10. The exchangeable abrasive mechanism according to claim 9 , wherein:
the diameter of the cross-sectional area of a first sub-group of the second group is equal to or greater than the diameter of the cross-sectional area of the through openings of the first group, and
the diameter of the cross-sectional area of a second sub-group of the second group is less than or equal to the diameter of the cross-sectional area of the through openings of the first group.

11. The exchangeable abrasive mechanism according to claim 10 , wherein the first sub-group comprises at least one through opening the diameter of which being between 70% and 105% of the diameters of the suction holes of the abrasive-mechanism carrier.

12. The exchangeable abrasive mechanism according to claim 10 , wherein the second sub-group comprises at least two through openings the diameters of which being between 50% and 85% of the diameters of the suction holes of the abrasive-mechanism carrier and being not greater than the diameter of the first sub-group.

13. The exchangeable abrasive mechanism according to claim 5 , wherein the cross-sectional area of the through openings of the third group are circular and have at least one differing diameter, the third group including at least two sub-groups of through openings that differ in a diameter of the cross-sectional area.

14. The exchangeable abrasive mechanism according to claim 3 , wherein the third group comprises five or six through openings.

15. The exchangeable abrasive mechanism according to claim 1 , wherein the exchangeable abrasive mechanism is an abrasive disc.

16. The exchangeable abrasive mechanism according to claim 1 , wherein the at least two of the through openings of the first group are configured to overlap the two suction holes respectively assigned to them.

17. The exchangeable abrasive mechanism according to claim 1 , wherein the second cross section of the through openings of the second group is smaller than the first cross section.

18. The exchangeable abrasive mechanism according to claim 2 , wherein the second group comprises exactly five or six through openings.

19. The exchangeable abrasive mechanism according to claim 5 , wherein the cross section of the respective suction hole is touched at least tangentially by the cross-sectional area of the through openings.

20. The exchangeable abrasive mechanism according to claim 8 , wherein the first diameter of the through openings of the first group is one or more of approximately between 80% and 100% of the diameters of the suction holes of the abrasive-mechanism carrier and between 8 mm and 10 mm.

21. An exchangeable abrasive mechanism for use on an abrasive-mechanism carrier of an abrasion appliance that has suction holes, the abrasive-mechanism carrier having either five or eight circular suction holes that each have substantially a same diameter and are disposed either on a first, larger hole-circle diameter or a second, smaller hole-circle diameter on the abrasive-mechanism carrier, the abrasive mechanism comprising:
a body; and
a plurality of through openings formed in the body, each through opening having a cross-sectional area that defines a centroid, the plurality of through openings differentiated into three groups of through openings, the groups differing from each other in a radial disposition of the centroids of the respective through openings, the three groups including:

Assignees

• Bosch Gmbh Robert

Inventors

• Breitenmoser Josef
• Fritsch Stephan

Classifications

• B24B55/10

  specially designed for portable grinding machines, e.g. hand-guided · CPC title

• B24D11/00 Primary

  Constructional features of flexible abrasive materials; Special features in the manufacture of such materials · CPC title

• B24B55/06 Primary

  Dust extraction equipment on grinding or polishing machines (B24B31/12 takes precedence) · CPC title