Patent US3858368A successfully refreshed from Google Patents.
US3858368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable quick coupling rotary grinding disc for compoundly curved surfaces
Assignee: Individual
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Filing: 1973-09-14
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Granted: 1975-01-07
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Expires: 1993-09-14
Abstract
Abstract Either or both of the opposite surfaces of a disc are coated with an abrasive material that is held in place by an adhesive. The disc is thin in radial cross section and of a somewhat elastic material so as to be flexibly and transiently deformable, when axially loaded, into conformity with compound curvatures on surfaces to be ground by the abrasive. The rear or inner surface of the disc is centrally integrally formed with a co-axially rearwardly projecting coupling sleeve of relatively small outer diameter, e.g., preferably no more than one-fourth to one-fifth of the disc diameter. The sleeve is matingly engageable by one end of a male driving arbor, the two parts being press-fitted together and held against axial displacement in either direction by a detent means comprising complementarily shaped portions of the two pieces. The sleeve interior and the arbor are of noncircular cross sectional configuration to be keyed together for co-rotation.
Inventors
- 👤 Francis E Cocherell
- 👤 Warren F Frinchaboy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:07
CPC Classifications
B; B24; B24D; B24D13/00; B24D13/20; A; A61; A61C; A61C3/00; A61C3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A unitary, disposable, grinding disc and quick coupling sleeve comprising: a disc having a forward face and a rear face and having a coupling sleeve formed as a coaxially rearwardly extending projection on said rear face; said disc having an imperforate forward face of circular area disposed at substantially 90* to the axis of said sleeve; said sleeve being of cylindrical external surface configuration and including an angle of 90* to 100*, approximately, relative to said rear face; said rear face comprising an annular area whose outer diameter is at least double that of said sleeve and substantially coincident with the outer diameter of said forward face; said disc and sleeve being made of a flexible material such that said disc, outwardly of said sleeve, is deformable to transiently conform to compoundly curved surfaces on which said disc is rotating; said sleeve being internally formed with an axially extending blind hole that opens into the rear end of said sleeve for drivably receiving one end of a driving arbor.
Claim 2
Dependent Claim
169 words
A unitary, disposable, grinding disc and quick coupling sleeve comprising: a disc having a forward face and a rear face and having a coupling sleeve formed as a coaxially rearwardly extending projection on said rear face; said disc having an imperforate forward face of circular area disposed at substantially 90* to the axis of said sleeve; said sleeve being of cylindrical external surface configuration and including an angle of 90* to 100*, approximately, relative to said rear face; said rear face comprising an annular area whose outer diameter is at least double that of said sleeve and substantially coincident with the outer diameter of said forward face; said disc and sleeve being made of a flexible material such that said disc, outwardly of said sleeve, is deformable to transiently conform to compoundly curved surfaces on which said disc is rotating; said sleeve being internally formed with an axially extending blind hole that opens into the rear end of said sleeve for drivably receiving one end of a driving arbor.
Claim 3
Dependent Claim
28 words
A unitary disc and coupling as in claim 1 in which at least one of said circular forward and annular rear faces is coated with an abrasive material.
Claim 4
Dependent Claim
28 words
A unitary disc and coupling as in claim 1 in which the angle included between said forward and rear faces is on the order of 7* to 10*.
Claim 5
Dependent Claim
22 words
A unitary disc and coupling as in claim 1 in which said blind hole of said sleeve is of non-circular cross-sectional configuration.
Claim 6
Dependent Claim
16 words
A unitary disc and coupling as in claim 1 that is made of a rubber-like material.
Claim 7
Dependent Claim
20 words
A unitary disc as coupling as in claim 5 that includes up to 50 percent approximately, by weight, of polystyrene.
Claim 8
Dependent Claim
15 words
A unitary disc and coupling as in claim 5 that includes a fibrous stiffener material.
Claim 9
Dependent Claim
31 words
A unitary disc aNd coupling as in claim 7, that includes a rubber-like material and a flock material in the approximate ratio of 100 parts to 17 parts by weight, respectively.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |