Molded brush segment

• US 5,903,951 A
• Filed: 10/30/1996
• Issued: 05/18/1999
• Est. Priority Date: 11/16/1995
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Ionta, Richard, Johnson, David E., Bange, Donna W., Pihl, Richard M., Roeker, David C., Liepa, Mara E.
• Primary Examiner(s): Till, Terrence R.
• Application Number:
  US08/739,635
• Time in Patent Office: 930 Days
• Field of Search: 15/179, 15/180, 15/181, 15/187, 15/198, 451/464, 451/465, 451/466
• US Class Current: 15/180
• CPC Class Codes: A46B 13/003 made up of a series of annular brush rings; Annular brush rings therefor
• CPC Class Codes: A46B 13/008 Disc-shaped brush bodies
• CPC Class Codes: A46B 2200/3093 Brush with abrasive properties, e.g. wire bristles
• CPC Class Codes: A46B 3/005 Bristle carriers and bristles moulded as a unit A46B1/00 takes precedence
• CPC Class Codes: A46D 1/00 Bristles; Selection of materials for bristles making artificial bristles D01D, D01F
• CPC Class Codes: A46D 1/023 Bristles with at least a core and at least a partial sheath
• CPC Class Codes: B24D 13/10 comprising assemblies of brushes
• CPC Class Codes: B24D 18/0009 using moulds or presses
• CPC Class Codes: B24D 3/28 Resins or natural or synthetic macromolecular compounds B24D3/22 takes precedence
• CPC Class Codes: B29C 45/0013 using fillers dispersed in the moulding material, e.g. metal particles
• CPC Class Codes: B29C 45/26 Moulds
• CPC Class Codes: B29L 2031/42 Brushes

Abstract

A molded brush segment having a plurality of integrally molded bristles extending from a generally planar center portion. The brush segment is molded from a moldable polymer such a thermoset polymer, thermoplastic polymer, or thermoplastic elastomer. The moldable polymer preferably includes a plurality of organic or inorganic abrasive particles interspersed throughout at least the bristles, and can be interspersed throughout the brush segment. The molded brush segments can be generally circular, with the bristles extending radially outward in the plane defined by the central portion. A plurality of brush segments can be combined to form a brush assembly. Also disclosed is a method of making a molded abrasive brush and a method of refining a workpiece surface with a molded abrasive brush.

Claims

1. An integrally molded brush segment comprising:

a generally planar center portion having an outer edge; and

a plurality of bristles extending from said outer edge of said center portion, wherein said bristles have an aspect ratio of at least 2, and wherein said bristles are integrally molded with said center portion;

wherein said molded brush segment comprises a moldable polymeric material, and wherein said bristles include a plurality of abrasive particles interspersed in said moldable polymeric material.

2. The molded brush segment of claim 1, wherein said bristles have an aspect ratio of at least 10.

3. The molded brush segment of claim 1, wherein said bristles each comprise a root adjacent said center portion and a tip opposite said base, and wherein said bristles are tapered so as to be wider at said root than at said tip.

4. The molded brush segment of claim 1, wherein said bristles are coplanar with said center portion.

5. The molded brush segment of claim 1, further comprising an attachment means provided on said center portion for attaching said brush segment to a drive means.

6. The molded brush segment of claim 5, wherein said center portion further comprises an inner edge, and wherein said attachment means comprises a root integrally molded with said molded brush segment, said root extending from said inner edge and including a neck portion adjacent said inner edge and a base portion remote from said inner edge, said base portion being wider than said neck portion.

7. The molded brush segment of claim 5, wherein said center portion further comprises an inner edge, and wherein said attachment means comprises a keyway formed in said inner edge, said keyway configured to engage with a corresponding key formed in a drive means.

8. The molded brush segment of claim 1, wherein said center portion further includes an inner edge, and wherein said inner edge and said outer edge comprise concentric circles bounding said center portion.

9. The molded brush segment of claim 8, wherein said inner edge is configured to accept a drive shaft therethrough, and said center portion further comprises a mounting hole therein for accepting a locking rod therethrough.

10. The molded brush segment of claim 9, wherein said bristles are coplanar with said center portion and extend radially from said outer edge of said center portion.

11. The molded brush segment of claim 10, wherein said bristles are evenly angularly spaced about said outer edge.

12. The molded brush segment of claim 1, wherein said bristles are oblique to the-plane of said center portion.

13. The molded brush segment of claim 1, wherein said abrasive particles comprise inorganic abrasive particles.

14. The molded brush segment of claim 1, wherein said abrasive particles comprise organic abrasive particles.

15. The molded brush segment of claim 1, wherein said center portion further comprises an inner edge opposite said outer edge, said inner edge and said outer edge each comprising arcuate circular segments comprising an angular size equal to one another and no greater than 180°

, said center portion further comprising a first radial edge extending from a first end of said inner edge to a first end of said outer edge, and a second radial edge extending from a second end of said inner edge to a second end of said outer edge.

16. The molded brush segment of claim 15, wherein said angular size equals 180°

.

17. The molded brush segment of claim 15, wherein said angular size equals 120°

.

18. The molded brush segment of claim 15, wherein said angular size equals 90°

.

19. The molded brush segment of claim 1, wherein said abrasive particles are interspersed in said moldable polymeric material throughout said brush segment.

20. The molded brush segment of claim 1, wherein said moldable polymeric material comprises a thermoplastic elastomer.

21. The molded brush segment of claim 1, wherein said center portion is circular, and wherein said bristles are oblique to a radial plane of said center portion intersecting each respective bristle.

22. The molded brush of claim 1, wherein said plurality of abrasive particles comprises a plurality of precisely shaped particles.

23. The molded brush of claim 22, wherein said shaped particles include abrasive grit.

46. The molded brush segment of claim 16, wherein said moldable polymeric material comprises a thermoplastic elastomer.

48. The molded brush segment of claim 17, wherein said attachment means comprises a threaded stud integrally molded with said center portion, and, located at the center of said center portion.

24. An integrally molded brush segment comprising:

a generally planar center portion having an outer edge;

a plurality of bristles extending from said outer edge of said center portion, wherein said bristles have an aspect ratio of at least 2, and wherein said bristles are integrally molded with said center portion; and

an attachment means provided on said center portion for attaching said brush segment to a drive means;

wherein said molded brush segment comprises a moldable polymeric material, wherein said outer edge is circular, and wherein said attachment means comprises a threaded stud integrally molded with said center portion, and located at the center of said center portion.

25. The molded brush segment of claim 24, wherein said bristles are coplanar with said center portion.

26. The molded brush segment of claim 25, wherein said bristles extend radially from said outer edge of said center portion.

27. The molded brush segment of claim 24, wherein said bristles are oblique to the plane of said center portion.

28. The molded brush segment of claim 24, wherein said bristles are oblique to a radial plane of said center portion intersecting each respective bristle.

29. The molded brush segment of claim 24, wherein said bristles include a plurality of abrasive particles interspersed in said moldable polymeric material.

30. The molded brush of claim 29, wherein said plurality of abrasive particles comprises a plurality of precisely shaped particles.

31. The molded brush of claim 30, wherein said shaped particles include abrasive grit.

32. The molded brush segment of claim 24, wherein said moldable polymeric material comprises a thermoplastic elastomer.

33. An integrally molded brush segment comprising:

a generally planar center portion having an outer edge; and

a plurality of bristles extending from said outer edge of said center portion, wherein said bristles have an aspect ratio of at least 2,and wherein said bristles are integrally molded with said center portion;

wherein said molded brush segment comprises a moldable polymeric material, wherein said bristles are oblique to the plane of said center portion, wherein said center portion is circular, and wherein said bristles are oblique to a radial plane of said center portion intersecting each respective bristle.

34. The molded brush segment of claim 33, wherein said bristles include a plurality of abrasive particles interspersed in said moldable polymeric material.

35. The molded brush of claim 34, wherein said plurality of abrasive particles comprises plurality of precisely shaped particles.

36. The molded brush of claim 35, wherein said shaped particles include abrasive grit.

37. The molded brush segment of claim 33, wherein said moldable polymeric material comprises a thermoplastic elastomer.

38. The molded brush segment of claim 33, further comprising an attachment means provided on said center portion for attaching said brush segment to a drive means.

39. The molded brush segment of claim 38, wherein said outer edge is circular, and wherein said attachment means comprises a threaded stud integrally molded with said center portion, and located at the center of said center portion.

40. An integrally molded brush segment comprising:

a generally planar center portion having an outer edge; and

a plurality of bristles extending from said outer edge of said center portion, wherein said bristles have an aspect ratio of at least 2, and wherein said bristles are integrally molded with said center portion;

wherein said molded brush segment comprises a moldable polymeric material, wherein said center portion is circular, and wherein said bristles are oblique to a radial plane of said center portion intersecting each respective bristle.

41. The molded brush segment of claim 40, wherein said bristles include a plurality of abrasive particles interspersed in said moldable polymeric material.

42. The molded brush of claim 41, wherein said plurality of abrasive particles comprises a plurality of precisely shaped particles.

43. The molded brush of claim 42, wherein said shaped particles include abrasive grit.

44. The molded brush of claim 43, wherein said plurality of abrasive particles comprises plurality of precisely shaped particles.

45. The molded brush of claim 44, wherein said moldable abrasive grit.

47. The molded brush segment of claim 40, further comprising an attachment means-provided on said center portion for attaching said brush segment to a drive means.

49. An integrally molded brush segment comprising:

a generally planar center portion having an outer edge; and

a plurality of bristles extending from said outer edge of said center portion wherein said bristles have an aspect ratio of at least 2, and wherein said bristles are integrally molded with said center portion;

wherein said molded brush segment comprises a thermoplastic elastomer.

50. The molded brush segment of claim 49, wherein said thermoplastic elastomer is selected from the group consisting essentially of:

polyester-based thermoplastic elastomer, nylon-based thermoplastic elastomer, and polyurethane-based thermoplastic elastomer.

51. The molded brush segment of claim 50, wherein said thermoplastic elastomer comprises a polyester based thermoplastic elastomer.

52. The molded brush segment of claim 49, wherein said bristles include a plurality of abrasive particles interspersed in said thermoplastic elastomer.

53. The molded brush segment of claim 52, wherein said abrasive particles are interspersed in said thermoplastics elastomer throughout said brush segment.

54. The molded brush of claim 49, wherein said bristles include a plurality of abrasive particles interspersed in said thermoplastic elastomer.

55. The molded brush segment of claim 49, wherein said bristles are coplanar with said center portion.

56. The molded brush segment of claim 49, wherein said bristles are coplanar with said center portion and extend radially from said outer edge of said center portion.

57. The molded brush segment of claim 49, wherein said bristles are oblique to the plane of said center portion.

58. The molded brush segment of claim 49, wherein said center portion is circular, and wherein said bristles are oblique to a radial plane of said center portion intersecting each respective bristle.

59. An integrally molded brush segment comprising:

a generally planar center portion having inner and outer edges defining concentric circles;

said inner edge defining a circular hole in said center portion; and

a plurality of bristles extending radially from said outer edge of said center portion, wherein said bristles are coplanar with said center portion, have an aspect ratio of at least 2, and are integrally molded with said center portion;

wherein said molded brush segment comprises a polymeric thermoplastic elastomer including abrasive particles interspersed throughout.

60. The molded brush segment of claim 59, further comprising an attachment means provided on said center portion for attaching said brush segment to a drive means edge, and wherein said attachment means comprises a root integrally molded with said molded brush segment, said root extending from said inner edge and including a neck portion adjacent said inner edge and a base portion remote from said inner edge, said base portion being wider than said neck portion.

61. The molded brush segment of claim 59, further comprising an attachment means provided on said center portion for attaching said brush segment to a drive means, wherein said attachment means comprises a keyway formed in said inner edge, said keyway configured to engage with a corresponding key formed in a drive means.

62. An integrally molded brush segment comprising:

a generally planar center portion having a circular outer edge;

a plurality of bristles extending radially from said outer edge of said center portion, wherein said bristles are coplanar with said center portion, have an aspect ratio of at least 2, and are integrally molded with said center portion; and

an attachment means provided at the center of said center portion for attaching said brush segment to a drive means;

wherein said molded brush segment comprises a polymeric thermoplastic elastomer including abrasive particles interspersed at least throughout said bristles.

63. The molded brush segment of claim 62, wherein said attachment means comprises a threaded stud integrally molded with said center portion, and located at the center of said center portion.

64. An integrally molded brush segment comprising:

a generally planar center portion having a circular outer edge;

a plurality of bristles extending from said outer edge of said center portion, wherein said bristles are oblique to a respective radial plane of said center portion extending through said bristles, are oblique to the plane of said center portion, have an aspect ratio of at least 2, and are integrally molded with said center portion; and

an attachment means provided at the center of said center portion for attaching said brush segment to a drive means;

wherein said molded brush segment comprises a polymeric thermoplastic elastomer.

65. The molded brush segment of claim 64, wherein said bristles include a plurality of abrasive particles interspersed in said polymeric thermoplastic elastomer.

66. The molded brush segment of claim 65, wherein said abrasive particles are interspersed in said thermoplastic elastomer throughout said brush segment.

67. The molded brush of claim 65, wherein said plurality of abrasive particles comprises a plurality of precisely shaped particles.

68. The molded brush of claim 67, wherein said shaped particles include abrasive grit.

69. The molded brush segment of claim 64, wherein said attachment means comprises a threaded stud integrally molded with said center portion.

70. An integrally molded brush segment comprising:

a generally planar center portion;

wherein said center portion includes inner and outer edges each comprising arcuate circular segments comprising an angular size equal to one another and no greater than 180°

, a first radial edge extending from a first end of said inner edge to a first end of said outer edge, and a second radial edge extending from a second end of said inner edge to a second end of said outer edge; and

a plurality of bristles extending radially from said outer edge of said center portion, wherein said bristles are coplanar with said center portion, have an aspect ratio of at least 2, and are integrally molded with said center portion;

wherein said molded brush segment comprises a polymeric thermoplastic elastomer including abrasive particles interspersed throughout.

71. A brush assembly comprising:

a) a plurality of molded brush segments, each of said molded brush segments comprising;

i) a generally planar center portion having an inner edge and an outer edge opposite said inner edge, wherein said inner edge and said outer edge define concentric arcuate edges, respectively;

ii) a plurality of bristles extending from said outer edge of said center portion, wherein said bristles have an aspect ratio of at least 2, and wherein said bristles are integrally molded with said center portion; and

iii) attachment means provided on said center portion for attaching said brush segment to a drive means;

wherein said molded brush segment comprises a moldable polymeric material; and

b) rotary drive means for rotating said plurality of molded brush segments,

wherein each of said molded brush segments are mounted to said drive means by said attachment means so that each of said generally planar center portions are parallel to one another.

72. The brush assembly of claim 71, wherein each of said molded brush segments is in contact with an adjacent molded brush segment.

73. The brush assembly of claim 71, wherein said drive means comprises a cylindrical shaft, wherein said inner and outer edges are both circular, wherein said inner edges defines a circular opening for accepting said shaft therethrough, and wherein said center portion extends for 360°

around said shaft.

74. The brush assembly of claim 73, wherein said attachment means comprises a root integrally molded with said molded brush segment, said root extending from said inner edge and including a neck portion adjacent said inner edge and a base portion remote from said inner edge, said base portion being wider than said neck portion, and wherein said shaft includes a slot configured to accept said root.

75. The brush assembly of claim 73, wherein said attachment means comprises a keyway formed in said inner edge, and said shaft includes a key configured to engage said keyway.

76. The brush assembly of claim 73, wherein said attachment means comprises a mounting hole formed is said center portion and a locking rod extending therethrough.

77. The brush assembly of claim 71, wherein said attachment means comprises a root integrally molded with said molded brush segment, said root extending from said inner edge and including a neck portion adjacent said inner edge and a base portion remote from said inner edge, said base portion being wider than said neck portion, and wherein said shaft includes a slot configured to accept said root.