US4607464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated abrasive back up pad
Assignee: 3M Co
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Filing: 1984-11-13
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Granted: 1986-08-26
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Expires: 2004-11-13
Abstract
Abstract A coated abrasive back up pad comprising a layer of resiliently compressible foam, a generally rigid backing plate fixed to one surface of the layer of foam and including, structure adapted for coupling the back up pad to a drive motor, and a flexible magnetized layer fixed to a surface of the foam layer opposite the backing plate and having a generally planar outer support surface. The foam layer includes a lip extending around the peripheral edge of the magnetized layer to protect that edge during use of the pad to drive a sheet of coated abrasive.
Inventors
- 👤 Thomas W. Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:45
CPC Classifications
B; B24; B24D; B24D9/00; B24D9/08; B24D9/085; B24D3/00; B24D3/001; B24D3/002
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
188 words
In a coated abrasive back up pad comprising a layer of resiliently compressible foam having first and second spaced surfaces a generally rigid backing plate fixed to said first surface of said backing plate, means attached to said backing plate adapted for coupling said back up pad to a drive motor, and a flexible magnetized layer comprising magnetized particles within a polymeric matrix fixed to the second surface of said layer of foam, having a generally planar support surface opposite said layer of foam and having an edge surface adjoining and disposed generally normal to the support surface, the improvement wherein: said foam layer includes a lip extending around the edge surface of said magnetized layer, said lip having a peripheral surface generally coplanar with said support surface; both said support surface and said peripheral surface are adapted to provide support for a sheet of abrasive material positioned on the back up pad; and said edge surface of said magnetized layer is beveled inwardly from the second surface of the layer of foam toward said support surface to help hold the magnetized layer in the layer of foam.
Claim 2
Dependent Claim
188 words
In a coated abrasive back up pad comprising a layer of resiliently compressible foam having first and second spaced surfaces a generally rigid backing plate fixed to said first surface of said backing plate, means attached to said backing plate adapted for coupling said back up pad to a drive motor, and a flexible magnetized layer comprising magnetized particles within a polymeric matrix fixed to the second surface of said layer of foam, having a generally planar support surface opposite said layer of foam and having an edge surface adjoining and disposed generally normal to the support surface, the improvement wherein: said foam layer includes a lip extending around the edge surface of said magnetized layer, said lip having a peripheral surface generally coplanar with said support surface; both said support surface and said peripheral surface are adapted to provide support for a sheet of abrasive material positioned on the back up pad; and said edge surface of said magnetized layer is beveled inwardly from the second surface of the layer of foam toward said support surface to help hold the magnetized layer in the layer of foam.
Claim 3
Dependent Claim
31 words
A back up pad according to claim 1 wherein said lip is in the range of about 1/4 to 1 centimeter thick in a direction generally normal to said edge surface.
Claim 4
Dependent Claim
18 words
A back up pad according to claim 1 wherein the periphery of said layer of foam is rectangular.
Claim 5
Dependent Claim
24 words
A back up pad according to claim 1 wherein the periphery of said layer of foam is in the shape of a conical frustum.
Claim 6
Dependent Claim
17 words
A back up pad according to claim 1 wherein said layer of foam is of polyether urethane.
Claim 7
Dependent Claim
157 words
In a coated abrasive back up pad comprising a layer of resiliently compressible foam having first and second spaced surfaces, and a flexible magnetized layer comprising magnetized particles within a polymeric matrix fixed to the second surface of said layer of foam, having a generally planar support surface opposite said layer of foam and having an edge surface adjoining and disposed generally normal to the support surface, the improvement wherein: said foam layer includes a lip extending around the edge surface of said magnetized layer, said lip having a peripheral surface generally coplanar with said support surface; both said support surface and said peripheral surface are adapted to provide support for a sheet of abrasive material positioned on the back up pad; and said edge surface of said magnetized layer is beveled inwardly from the second surface of the layer of foam toward said support surface to help hold the magnetized layer in the layer of foam.
Claim 8
Dependent Claim
157 words
In a coated abrasive back up pad comprising a layer of resiliently compressible foam having first and second spaced surfaces, and a flexible magnetized layer comprising magnetized particles within a polymeric matrix fixed to the second surface of said layer of foam, having a generally planar support surface opposite said layer of foam and having an edge surface adjoining and disposed generally normal to the support surface, the improvement wherein: said foam layer includes a lip extending around the edge surface of said magnetized layer, said lip having a peripheral surface generally coplanar with said support surface; both said support surface and said peripheral surface are adapted to provide support for a sheet of abrasive material positioned on the back up pad; and said edge surface of said magnetized layer is beveled inwardly from the second surface of the layer of foam toward said support surface to help hold the magnetized layer in the layer of foam.
Claim 9
Dependent Claim
31 words
A back up pad according to claim 6 wherein said lip is in the range of about 1/4 to 1 centimeter thick in a direction generally normal to said edge surface.
Claim 10
Dependent Claim
18 words
A back up pad according to claim 6 wherein the periphery of said layer of foam is rectangular.
Claim 11
Dependent Claim
24 words
A back up pad according to claim 6 wherein the periphery of said layer of foam is in the shape of a conical frustum.
Claim 12
Dependent Claim
17 words
A back up pad according to claim 6 wherein said layer of foam is of polyester urethane.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |