US3239971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc sanding tool
Assignee: 3M Co
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Filing: 1963-08-30
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Granted: 1966-03-15
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Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
- 👤 Conrad T Freerks
- 👤 Arvid L Gafkjen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:51
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/08; B24D9/085; B24D7/00; B24D7/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A QUICK-CHANGE ABRASIVE DISC DEVICE COMPRISING IN COMBINATION: A BACKUP PAD HAVING AN AXIAL HOLE, A BOLT HAVING A SHANK SUBSTANTIALLY THE SAME SIZE AS SAID HOLE AND EXTENDING THERETHROUGH, AND A NON-CIRCULAR HEAD, GREATER IN AREA THAN THE CROSSSECTION OF SAID SHANK, POSITIONED AT THE FACE OF SAID BACKUP PAD, AN ABRASIVE DISC HAVING A CENTRAL HOLE WHICH IS APPROXIMATELY THE SAME SIZE AND SHAPE AS THE CROSSSECTION OF SAID HEAD, SAID DISC BEING MOUNTED ON SAID SHANK AGAINST THE FACE OF SAID BACKUP PAD, A RIGID WASHER SMALLER IN DIAMETER THAN SAID DISC AND HAVING A CENTRAL HOLE WHICH IS APPROXIMATELY THE SAME SIZE AND SHAPE AS THE CROSS-SECTION OF SAID HEAD, SAID WASHER BEING MOUNTED ON SAID SHANK, POSITIONED BETWEEN SAID HEAD AND SAID DISC, AND ROTATED SO THAT SAID HOLE IS RADIALLY DISPLACED WITH RESPECT TO SAID HEAD, MEANS MOUNTED AT THE REAR OF SAID BACKUP PAD FOR URGING SAID HEAD TOWARD SAID PAD, WHEREBY SAID DISC IS HELD IN POSITION, AND MEANS FOR ATTACHING THE DEVICE TO A DRIVING MEANS FOR ROTATING SAID BACKUP PAD.
Claim 2
Dependent Claim
180 words
A QUICK-CHANGE ABRASIVE DISC DEVICE COMPRISING IN COMBINATION: A BACKUP PAD HAVING AN AXIAL HOLE, A BOLT HAVING A SHANK SUBSTANTIALLY THE SAME SIZE AS SAID HOLE AND EXTENDING THERETHROUGH, AND A NON-CIRCULAR HEAD, GREATER IN AREA THAN THE CROSSSECTION OF SAID SHANK, POSITIONED AT THE FACE OF SAID BACKUP PAD, AN ABRASIVE DISC HAVING A CENTRAL HOLE WHICH IS APPROXIMATELY THE SAME SIZE AND SHAPE AS THE CROSSSECTION OF SAID HEAD, SAID DISC BEING MOUNTED ON SAID SHANK AGAINST THE FACE OF SAID BACKUP PAD, A RIGID WASHER SMALLER IN DIAMETER THAN SAID DISC AND HAVING A CENTRAL HOLE WHICH IS APPROXIMATELY THE SAME SIZE AND SHAPE AS THE CROSS-SECTION OF SAID HEAD, SAID WASHER BEING MOUNTED ON SAID SHANK, POSITIONED BETWEEN SAID HEAD AND SAID DISC, AND ROTATED SO THAT SAID HOLE IS RADIALLY DISPLACED WITH RESPECT TO SAID HEAD, MEANS MOUNTED AT THE REAR OF SAID BACKUP PAD FOR URGING SAID HEAD TOWARD SAID PAD, WHEREBY SAID DISC IS HELD IN POSITION, AND MEANS FOR ATTACHING THE DEVICE TO A DRIVING MEANS FOR ROTATING SAID BACKUP PAD.
References Cited (Backward Citations)
US1941840A
Cited
US2531775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |