Title: Abrasive article

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Claims: What is claimed is:

1. An abrasive article comprising a nonabrasive support member having an annular support surface and an annular abrasive member adhesively secured directly to the annular support surface of said support member, wherein said annular abrasive member includes annular resin - bonded abrasive means so constructed and arranged as to provide the outer peripheral surface of said annular abrasive member and having an annular abrading surface, and an annular back-up member of a frangible and abradable porous polyimide resin secured to the inside surface of said annular abrasive means and to the annular support surface of said support member, said annular back-up member having an annular surface terminating in a plane coextensive with the annular abrading surface of said annular resin-bonded abrasive means, whereby said annular surface of said annular back-up member is adapted to abrade and wear away when said annular abrading surface of said annular resin-bonded abrasive means is consumed in use.

2. The abrasive article of claim 1 wherein the resin of said annular resin-bonded abrasive means is a polyimide resin.

3. A self-dressing abrasive grinding wheel having an annular abrasive surface comprising a nonabrasive support member; an annular resin-bonded abrasive member adhesively secured directly to said support member; and an annular nonabrasive back-up member of an abradable porous polyimide resin secured to said annular resin-bonded abrasive member and to said nonabrasive support member, said backup member terminating in a surface coextensive with said abrasive surface.

Other info:

Inventors: Wood, Everitt Franklin (West Chester, PA, US)

Application Number: 590495
Filing Date: 1975-06-26
Publication_date: 1977-01-11
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Class(es): 451/548 51/298
Other Classes:
US Patent Ref:

2734812	Feb, 1956	Robie	51/298.
3117400	Jan, 1964	Martin	51/209.
3179631	Apr, 1965	Endrey	51/298.
3261811	Jul, 1966	Tatum	51/298.
3329488	Jul, 1967	Cofran	51/296.
3377411	Apr, 1968	Charvat	51/298.
3383191	May, 1968	Thomas	51/298.
3385684	May, 1968	Voter	51/298.
3523773	Aug, 1970	Sears	51/298.
3718447	Feb, 1973	Hibbs	51/298.
3883452	May, 1975	Scheverlein et al.	51/298.

Other Refs:
Primary Examiner: Smith, Al Lawrence
Assistant Examiner: Ramsey, K. J.
Attorney: