US3643387A - Endless abrasive belt having an overlapping joint - Google Patents

Endless abrasive belt having an overlapping joint Download PDF

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Publication number
US3643387A
US3643387A US38117A US3643387DA US3643387A US 3643387 A US3643387 A US 3643387A US 38117 A US38117 A US 38117A US 3643387D A US3643387D A US 3643387DA US 3643387 A US3643387 A US 3643387A
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United States
Prior art keywords
end portion
abrasive
belt
overlapping
coating
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US38117A
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English (en)
Inventor
Hans Hildebrand
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Abrasives Inc
Original Assignee
Norton Co
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Filing date
Publication date
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Publication of US3643387A publication Critical patent/US3643387A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/06—Connecting the ends of materials, e.g. for making abrasive belts

Definitions

  • An endless abrasive belt of the type including one or more sections of backing material supporting an abrasive coating and having adjacent end portions overlapped to form joints extending obliquely of a direction of belt travel is characterized by the abrasive coating on an inner one of the overlapped end portions being removed over the longitudinal extent of the overlapping and the abrasive coating on an outer one of the overlapped end portions being removed only over a longitudinal extent in a range of about 30 to 80 percent of the overlapped distance.
  • the present invention generally relates to endless abrasive belts having overlapped, joints formed obliquely to a direction of travel of the belt, and more particularly refers to an abrasive belt having an abrasive coating partially removed at the overlapped ends in a region of the overlapping.
  • Abrasion operations employing broad, endless, abrasive belts, have been utilized during the past years not only in the woodworking arts but also in metal working industries. Oftentimes, those abrasion operations employ broad belt trains comprising several grinding or abrading stations employing belts having differently sized grain coatings. For example, an operation utilizing four stations may have two stations fitted with belts having coarse grains (grain size 40 or 50) and the two succeeding stations fitted with belts having finely sized grains (grain size 80 and finer), thereby to obtain the desired surface characteristics and finish.
  • the endless abrasive belt is urged against the workpiece by appropriate means, such as a contact roller or a contact pressure beam extending transversely of the belt travel over and having the abrasive belt trained thereover.
  • the endless abrasive belts including a backing material supporting an abrasive, grain material, may have a width of approximately 2.6 m. a circumferential length of approximately 3.8 m. and overlapped, butt joints extending longitudinally for a distance of approximately mm.
  • One form of overlapped joints has the abrasive coating removed only at the lower or innermost one of the overlapped end portions along the extent of the overlapping so that the upper or outermost belt end portions is glued onto an exposed, outer surface of the backing member. With that arrangement, the coating on the outer belt end portion projects above an adjacent portion of the coating carried on the inner belt end portion.
  • some abrasive belts utilize the other type of joint which has the coating removed at both the inner end portion and the outer end portion and for an extent on each end portion which corresponds to the extent of the overlapping.
  • That type of joint there is an absence of coating at the upper or outer side of the belt in the overlapped region, and a recess may be formed in the overlapped region since the grain coating removed from both of the belt end portions is oftentimes thicker than one-half of the thickness of the entire belt.
  • That type of abrasive belt joint does not produce the undesirable chatter marks.
  • the longitudinal extent of the glued joint is approximately 10 mm. or greater, it has been found that the use of the belts having the second type of joint produce undesirable burnt spots on the workpiece. Those burnt spots appear to be attributable to heated, abraded particles being captured in the recess or gap in the coating.
  • the removal of the coating at the outer end portion along the entire extent of the overlapped region sufficiently weakens the belt, particularly in a region of the outer end portion immediately adjacent a terminus of the inner end portion, thereby resulting in frequent breakage of the belt.
  • the joint is additionally stressed in transverse directions by a reciprocating transverse movement usually superimposed at the abrasion area and over the longitudinal movement of the belt.
  • the transverse reciprocating movement may have an extent of approximately 10 to l5 mm. and a frequency in a range of about 1 to 6 oscillations per minute.
  • An endless abrasive belt including one or more sections of backing material supporting an abrasive coating and having adjacent end portions overlapping to form a joint extending obliquely of a direction of belt travel, has the abrasive coating on an innermost one of the overlapped end portions removed over a longitudinal extent of the overlapping and has the abrasive coating at the outermost one of the overlapped end portions removed only over a longitudinal distance in a range of about 30 to percent of the extent of the overlapping. It has been found to be desirable to remove the abrasive coating on the outer end portion for a longitudinal distance equal to approximately 50 percent of the overlapping of the belt end portions.
  • the abrasive belt has an increased thickness over a portion of the region of overlapping.
  • the abrasive belt of the present invention does not produce either chatter marks or burnt spots on the workpiece.
  • the coating on the outer end portion overlaps a terminus of the inner end portion, thereby enhancing the tearing strength of the belt in the region of the joint.
  • the abrasive belt of the present invention may be rotated in a direction so that the outer end portion may run up on the workpiece without any disadvantage, thereby enabling an underside of the belt or the inner end portion to run off of a contact roller or contact pressure beam urging the belt into abrading engagement with the workpiece. In that manner, breakage of the belt is lessened, since the terminus of the inner end portion will not strike the contact member. Thus, a slightly imperfect area in the glued joint will not materially influence the useful life of the abrasive belt.
  • FIG. 1 is an end elevational view of an endless abrasive belt constructed in accordance with the present invention.
  • FIG. 2 is an enlarged, longitudinal cross-sectional view of the endless abrasive belt illustrated in FIG. l and illustrating an overlapped joint of the belt.
  • an endless abrasive belt 10 constructed in accordance with the present invention, comprises one or more sections of sheet form backing material ll supporting a coating 12 composed of an abrasive grain material.
  • the backing material 11 may be a continuous, looped band, as illustrated in FIG. 1, or, if desired, a plurality of aligned belt sections may be joined together in a manner to form a continuous loop.
  • the endless abrasive belt 10 is trained around appropriate drive wheels in a manner to form an abrading apparatus.
  • Contact means such as a roller or a beam member, having the belt 10 trained thereover urges. the belt into abrading contact with a workpiece.
  • a plurality of the belts may be arranged in a side-by-side relationship and provided with abrasive coatings having difierently sized grains, thereby to progressively abrade a surface to form a desired finish.
  • the abrasive coating 16 is removed from the overlapped end portions 17 and 18 over certain regions selected to enhance a tearing strength of the joint 14 and to eliminate chatter marks and burnt spots on the finished workpiece.
  • the abrasive coating 12 is removed from the inner end portion 18 over an area coextensive with the longitudinal extent of the overlapping between the inner end portion and the outer end portion 17, whereas the abrasive coating 12 is removed from the outer end portion over an area extending longitudinally of the backing material 11 for a distance in a range of about 30 to 80 percent of the extent of the overlapping.
  • the abrasive coating 12 on the inner end portion 18 terminates substantially along a juncture plane defined by a terminus 19 of the outer end portion 17, and the coating 12 on the outer end portion terminates along a plane overlying the region of .the overlapping between the end portions.
  • the outer overlapped end portion 17 may be outwardly offset,,as at 21, a distance substantially equal to a thickness of the backing material 11.
  • underneath or innermost surfaces 22 of adjacent sections of the backing material 1 1 disposed on opposite sides of the joint 14 are flush or substantially coplanar.
  • the abrasive belt 10 be rotated in the direction indicated by. the arrow 16 so that the inner overlapped end portion 18 runs off of the contact means. In that mariner, a terminus 23 of the inner end portion 18 does not directly strike the contact means, thereby lessening wear on the joint 14 and increasing the life expectancy of the abrasive belt 10.
  • the extent of overlapping between the end portions 17 and 18 may be approximately 10 mm., or 0.39 inches.
  • the abrasive coating 12 would be removed from the inner end portion 18 over a longitudinal extent, indicated by "a,”of approximately at 10 mm., and the coating would be removed from the outer end portions 17 over a longitudinal extent, indicated by b, of a value, within a range of about 3 v to 8 mm., and preferably 5 mm.
  • abrasive belt of the type including a stripform backing material supporting a coating of abrasive grain material, overlapped joints extending obliquely of a direction of belt travel and including an outer end portion overlapping an adjacent inner end portion, the improvement comprising:
  • the inner end portion having the abrasive coating removed therefrom in a region extending longitudinally inwardly of :1 terminus of the inner end'portion for a distance substantially coextensive with the extent of overlapping between the adjacent end portions;
  • the outer end portion having the coating removed therefrom in a region extending longitudinally from a terminus of the outer end portion a distance in a range of about 30 to percent of the extent of overlapping.
  • an endless abrasive belt according to claim 1 comprising the outer overlapped end portion having the abrasive coat ing removed therefrom over a region extending longitudinally inwardly of the inner end portion terminus for a distance of about 50 percent of the extent of overlapping.
  • An endless'abrasive belt according to claim I wherein the extent of overlapping between the adjacent, overlapped end portions is substantially equal to l0 mm., and wherein the outer end portion has the coating removed over a region extending longitudinally inwardly of a terminus thereof for a distance of approximately 5 mm.
  • An endless abrasive belt comprising:
  • abrasive coating adhered to an outwardly projecting surface of said backing material, said coating on said inner end portion terminating along a juncture plane defined by a terminus of said outer end portion, and i said coating terminating on said outer end portion along a plane spaced longitudinally inwardly of said outer end portion terminus a distance in a range of 30 to 80 percent of an extent of overlapping between said adjacent end portions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US38117A 1969-05-16 1970-05-18 Endless abrasive belt having an overlapping joint Expired - Lifetime US3643387A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691925151 DE1925151A1 (de) 1969-05-16 1969-05-16 Endloses Schleifband mit schraegem ueberlapptem Stoss

Publications (1)

Publication Number Publication Date
US3643387A true US3643387A (en) 1972-02-22

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ID=5734409

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US38117A Expired - Lifetime US3643387A (en) 1969-05-16 1970-05-18 Endless abrasive belt having an overlapping joint

Country Status (6)

Country Link
US (1) US3643387A (enrdf_load_stackoverflow)
CH (1) CH498691A (enrdf_load_stackoverflow)
DE (1) DE1925151A1 (enrdf_load_stackoverflow)
FR (1) FR2047572A5 (enrdf_load_stackoverflow)
GB (1) GB1258696A (enrdf_load_stackoverflow)
SE (1) SE350425B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341609A (en) * 1992-01-28 1994-08-30 Minnesota Mining And Manufacturing Company Abrasive belts and their manufacture
US5529590A (en) * 1993-05-20 1996-06-25 Minnesota Mining And Manufacturing Company Process for the manufacture of endless coated abrasive articles
US20060141918A1 (en) * 2004-12-27 2006-06-29 Reinke Paul R Endless abrasive belt and method of making the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1009709A (en) * 1911-04-22 1911-11-21 United Shoe Machinery Ab Belt for abrading-machines.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1009709A (en) * 1911-04-22 1911-11-21 United Shoe Machinery Ab Belt for abrading-machines.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470362A (en) * 1991-01-30 1995-11-28 Minnesota Mining And Manufacturing Company Method for making coated abrasive belts
US5341609A (en) * 1992-01-28 1994-08-30 Minnesota Mining And Manufacturing Company Abrasive belts and their manufacture
US5529590A (en) * 1993-05-20 1996-06-25 Minnesota Mining And Manufacturing Company Process for the manufacture of endless coated abrasive articles
US20060141918A1 (en) * 2004-12-27 2006-06-29 Reinke Paul R Endless abrasive belt and method of making the same
US7134953B2 (en) * 2004-12-27 2006-11-14 3M Innovative Properties Company Endless abrasive belt and method of making the same

Also Published As

Publication number Publication date
CH498691A (de) 1970-11-15
FR2047572A5 (enrdf_load_stackoverflow) 1971-03-12
GB1258696A (enrdf_load_stackoverflow) 1971-12-30
DE1925151A1 (de) 1970-12-03
SE350425B (enrdf_load_stackoverflow) 1972-10-30

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