Large-area washer having friction increasing elements on the underside thereof
US5915903A · kind A · utility
44Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1996 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Jul 26, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04D5/142
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a large-area washer (1) there is an aperture for the insertion of a fastener and a bead (16) to stiffen the washer (1). To provide better engagement with a plate and/or web to be fastened, there are engagement components (13) on the underside of the washer (1) which are pressed out of the whole material of the washer (1) and project approximately perpendicularly downwards from it. The engagement components (13) are conical or truncated cones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.