Back up pad with drive adapter and offset passageways
US4844967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Oct 14, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249953
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A coated abrasive back up pad is disclosed that may be attached to different types of drive motor assemblies by a simple rearrangement of an adapter included in the back up pad. The back up pad may have passageways with offset portions in a foam layer of the pad positioned to communicate between openings in an abrasive disk attached to the back up pad and vacuum systems in various drive motor assemblies to which it may be attached. A novel method is disclosed for molding the back up pad to form such passageways which includes molding dies into the pad that can later be removed by compressing the foam layer so that the dies cut outlet openings through which they are then removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.