US3867795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite resinoid bonded abrasive wheels
Assignee: Saint Gobain Abrasives Inc
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Filing: 1973-10-16
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Granted: 1975-02-25
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Expires: 1993-10-16
Abstract
Abstract Reinforced resin bonded abrasive depressed and straight center wheels for portable snagging grinders in which the thickness of each wheel comprises a primary abrading portion containing a superior, expensive, premium, fast cutting and durable cofused alumina-zirconia abrasive particles and an adjoining secondary abrading portion containing different, less costly, slower cutting abrasive particles which, it has been discovered, does not materially reduce the grinding performance of the wheel from one made entirely with alumina-zirconia abrasive throughout the thickness of the wheel.
Inventors
- 👤 William C Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:50
CPC Classifications
B; B24; B24D; B24D7/00; B24D7/02; B24D7/04; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A REINFORCED RESIN BONDED ABRASIVE GRINDING WHEEL OF PREDETERMINED THICKNESS HAVING A RELATIVELY NARROW PERIPHERAL GRIDING FACE USUALLY PRESENTED AND WORN AT AN ANGLE DURING GRINDING, EXTENDING BETWEEN A TOP AND A BOTTOM SIDE, REINFORCING MATERIAL BONDED THERETO AND MEANS FOR MOUNTING THE WHEEL FOR ROTSTION ABOUT ITS AXIS, WHEREIN THE IMPROVEMENT COMPRISES: A PRIMARY ABRADING PORTION EXTENDING ALONG THE BOTTOM SIDE TO THE PERIPHERAL GRINDING FACE AND OCCUPYING A PORTION OF THE PREDETERMIND THICKNESS OF THE WHEEL, AND HAVING RESIN BONDED PRIMARY ABRASIVE PARTICLES OF CO-FUSED ALUMINA-ZIRCONIA ABRASIVE MATERIAL CONTAINING FROM 10% TO 60% BY WEIGHT OF ZIRCONIA; AND A SECONDARY ABRADING PORTION BONDED TO AND EXTENDING FROM THE PRIMARY ABRADING PORTION TO THE TOP SIDE AND PERIPHERAL GRINDING FACE OF THE WHEEL AND HAVING RESIN BONDED SECONDARY ABRASIVE PARTICLES OF A SECONDARY ABRASIVE MATERIAL WHICH DIFFERS FROM AND OF LESS DURABILITY THAN THE ALUMINA-ZIRCONIA ABRASIVE MATERIAL.
Claim 2
Dependent Claim
148 words
A REINFORCED RESIN BONDED ABRASIVE GRINDING WHEEL OF PREDETERMINED THICKNESS HAVING A RELATIVELY NARROW PERIPHERAL GRIDING FACE USUALLY PRESENTED AND WORN AT AN ANGLE DURING GRINDING, EXTENDING BETWEEN A TOP AND A BOTTOM SIDE, REINFORCING MATERIAL BONDED THERETO AND MEANS FOR MOUNTING THE WHEEL FOR ROTSTION ABOUT ITS AXIS, WHEREIN THE IMPROVEMENT COMPRISES: A PRIMARY ABRADING PORTION EXTENDING ALONG THE BOTTOM SIDE TO THE PERIPHERAL GRINDING FACE AND OCCUPYING A PORTION OF THE PREDETERMIND THICKNESS OF THE WHEEL, AND HAVING RESIN BONDED PRIMARY ABRASIVE PARTICLES OF CO-FUSED ALUMINA-ZIRCONIA ABRASIVE MATERIAL CONTAINING FROM 10% TO 60% BY WEIGHT OF ZIRCONIA; AND A SECONDARY ABRADING PORTION BONDED TO AND EXTENDING FROM THE PRIMARY ABRADING PORTION TO THE TOP SIDE AND PERIPHERAL GRINDING FACE OF THE WHEEL AND HAVING RESIN BONDED SECONDARY ABRASIVE PARTICLES OF A SECONDARY ABRASIVE MATERIAL WHICH DIFFERS FROM AND OF LESS DURABILITY THAN THE ALUMINA-ZIRCONIA ABRASIVE MATERIAL.
Claim 3
Dependent Claim
67 words
A reinforced resin bonded abrasive grinding wheel according to claim 1 wherein the primary abrading portion further comprises: resin bonded diluent abrasive particles of an abrasive material selected from a group consisting of garnet, aluminum oxide, silicon carbide, emery, flint, silica, quartz and mixtures thereof mixed in with the alumina-zirconia particles and comprising up to 25% by volume of the abrasive particles in the primary abrading portion.
Claim 4
Dependent Claim
20 words
A reinforced resin bonded abrasive grinding wheel according to claim 2 wherein the diluent abrasive particles are made of garnet.
Claim 5
Dependent Claim
56 words
A reinforced resin bonded abrasive grinding wheel according to claim 1 wherein the secondary abrasive particles are made of an abrasive material selected from a group consisting of aluminum oxide, silicon carbide, garnet, silica, quartz, emery, flint and mixtures thereof and wherein the primary abrading portion occupies at least about one-half the thickness of the wheel.
Claim 6
Dependent Claim
35 words
A reinforced resin bonded abrasive grinding wheel according to claim 1 wherein the secondary abrasive particles are no larger than 16 grit size and wherein the alumina-zirconia particles are from 16 to 60 grit size.
Claim 7
Dependent Claim
27 words
A reinforced resin bonded abrasive grinding wheel according to claim 1 wherein the alumina-zirconia particles are of larger and coarser grit size than the secondary abrasive particles.
Claim 8
Dependent Claim
19 words
A reinforced resin bonded abrasive grinding wheel according to claim 4 wherein the secondary abrasive material is aluminum oxide.
Claim 9
Dependent Claim
40 words
A reinforced resin bonded abrasive grinding wheel according to claim 1 wherein the reinforcing material comprises: a first disc of open mesh fiber glass cloth situated substantially between and bonded to the primary and secondary abrading portions of the wheel.
Claim 10
Dependent Claim
57 words
A reinforced resin bonded abrasive grinding wheel according to claim 8 wherein the reinforcing material further comprises: a second disc of fiber glass cloth bonded to the bottom side and primary abrading portion of the wheel; and a third backing disc of fiber glass cloth bonded to the top side and secondary abrading portion of the wheel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |