US4187828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting
Assignee: GT Crystal Systems LLC
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Filing: 1978-03-13
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Granted: 1980-02-12
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Expires: 1998-03-13
Abstract
Abstract A cutting process in which a blade under tension is moved relative to a workpiece. The blade has a longitudinally-extending abrasive-holding portion defined by blade material that is softer than the workpiece to be cut and overlies a high tensile strength core. The abrasive-holding portion defines a cutting surface extending between opposite sides of the blade and defining less than one-half the total outer surface of the blade, and abrasive particles are partially embedded into a longitudinally-extending segment of the cutting surface but not into the sides of the blade.
Inventors
- 👤 Frederick Schmid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:16
CPC Classifications
B; B28; B28D; B28D5/00; B28D5/04; B28D5/042; B23; B23D; B23D61/00; B23D61/18; B23D61/185; C; C30; C30B; C30B33/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
In a longitudinally-extending blade charged with abrasive particles, that improvement wherein: said blade includes a longitudinally-extending abrasive-holding portion of metallic material having a hardness less than that of said abrasive particles and overlying a blade core of greater tensile strength; said blade and said blade core are circular in transverse cross-section and said abrasive-holding portion comprises an annular layer overlying the peripheral surface of said core; said abrasive holding portion defines a cutting surface extending between the opposite sides of said blade and defining less than one-half the total outer surface of said blade; the thickness of said abrasive-holding portion is in the range of not less than about one-half the normal size of said particles to less than the nominal size of said particles; and said particles are embedded into a longitudinally-extending segment of said cutting surface of said abrasive-holding portion but not into the sides of said blade, said longitudinally-extending segment into which said particles are embedded defining in transverse cross-section an arc of less than 180° whereby said particles do not project substantially beyond the sides of said blade.
Claim 2
Dependent Claim
182 words
In a longitudinally-extending blade charged with abrasive particles, that improvement wherein: said blade includes a longitudinally-extending abrasive-holding portion of metallic material having a hardness less than that of said abrasive particles and overlying a blade core of greater tensile strength; said blade and said blade core are circular in transverse cross-section and said abrasive-holding portion comprises an annular layer overlying the peripheral surface of said core; said abrasive holding portion defines a cutting surface extending between the opposite sides of said blade and defining less than one-half the total outer surface of said blade; the thickness of said abrasive-holding portion is in the range of not less than about one-half the normal size of said particles to less than the nominal size of said particles; and said particles are embedded into a longitudinally-extending segment of said cutting surface of said abrasive-holding portion but not into the sides of said blade, said longitudinally-extending segment into which said particles are embedded defining in transverse cross-section an arc of less than 180° whereby said particles do not project substantially beyond the sides of said blade.
Claim 3
Dependent Claim
18 words
The blade of claim 1 wherein said arc is in the range of about 120° to about 150°.
Claim 4
Dependent Claim
24 words
The blade of claim 1 wherein said abrasive-holding portion is material of hardness less than that of said blade core deposited on said core.
Claim 5
Dependent Claim
35 words
The blade of claim 1 wherein said abrasive-holding portion includes a first layer overlying said core and a second layer deposited over said first layer after said particles have been embedded in said first layer.
Claim 6
Dependent Claim
23 words
The blade of claim 4 wherein said first layer has a thickness of not more than one-half the nominal size of said particles.
Claim 7
Dependent Claim
34 words
The blade of claim 4 wherein said first layer has a thickness of about one-fourth the nominal size of said particles and said second layer has a thickness of about one-half said nominal size.
Claim 8
Dependent Claim
22 words
The blade of claim 4 wherein said second layer is copper or nickel electrically plated or electrolessly deposited over said first layer.
Claim 9
Dependent Claim
30 words
The blade of claim 1 wherein the thickness of said abrasive holding portion is in the range of about one-half to about three-fourths the nominal size of said abrasive particles.
Claim 10
Dependent Claim
153 words
In a longitudinally-extending blade of generally rectangular cross-section charged with abrasive particles, that improvement wherein: said blade includes a longitudinally-extending abrasive-holding portion of metallic material having a hardness less than that of said abrasive particles and overlying a blade core of greater tensile strength, the opposite sides of said blade being generally parallel to each other and defined at least in part by said core; said abrasive holding portion is of steel tempered to a hardness less than that of the remaining portion of said blade and defines a cutting surface extending between said sides of said blade and defining less than one-half the total outer surface of said blade; the thickness of said abrasive-holding portion is not less than about one-half the nominal size of said particles; and said particles are embedded into a longitudinally-extending segment of said cutting surface of said abrasive-holding portion but not into the sides of said blade.
Claim 11
Dependent Claim
153 words
In a longitudinally-extending blade of generally rectangular cross-section charged with abrasive particles, that improvement wherein: said blade includes a longitudinally-extending abrasive-holding portion of metallic material having a hardness less than that of said abrasive particles and overlying a blade core of greater tensile strength, the opposite sides of said blade being generally parallel to each other and defined at least in part by said core; said abrasive holding portion is of steel tempered to a hardness less than that of the remaining portion of said blade and defines a cutting surface extending between said sides of said blade and defining less than one-half the total outer surface of said blade; the thickness of said abrasive-holding portion is not less than about one-half the nominal size of said particles; and said particles are embedded into a longitudinally-extending segment of said cutting surface of said abrasive-holding portion but not into the sides of said blade.
Claim 12
Dependent Claim
25 words
The blade of claim 9 wherein said longitudinally-extending segment into which said particles are embedded defines in transverse cross-section an arc of less than 180°.
Claim 13
Dependent Claim
21 words
The blade of claim 10 wherein said arc is of radius not less than one-half the overall width of said blade.
Claim 14
Dependent Claim
24 words
The blade of claim 9 wherein said abrasive-holding portion has a hardness in the range of about 35R c to about 45R c .
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |