Washer with resilient head cripping means
US4712959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1987 |
| Grant date | Dec 15, 1987 |
| Priority date | — |
| Expiry date | Mar 30, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04D3/3603
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A washer for attaching insulation to a roof member over which roofing membrane is to be placed. The washer includes a laterally extending apertured flange and an upstanding hollow cylindrical protrusion adapted to snappingly engage the head of a fastener used with the washer. The protrusion has an inwardly extending lip on the inside surface of the free end of the protrusion. A resilient rib is disposed between the protrusion and the aperture in the washer. The rib resiliently urges the head of the fastener into engagement with the lip. The washer includes a downwardly extending hub, which may be equipped with means for retaining the washer in a batten strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.