Mechanical roof fastener
US4744187A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 27, 1987 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Jan 27, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16B43/001
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A mechanical fastener for securing a flexible sheet of an elastomeric material to the upper surface of a roof via the use of a plurality of such fasteners, each of which include upper and lower retaining members, wherein the latter are anchored to the roofing surface. Both of the retaining members are formed with a series of annular concentric ridges and grooves which cooperate with each other to form a series of annular gripping zones with the elastomeric sheet when the upper retainer is drawn into a clamping relationship with the botton retainer by a threaded fastener. The fastener is engaged with an internally threaded central boss formed on the lower retainer. A sharp bottom edge of the fastener cuts an aperture in the elastomeric sheet prior to engagement with the threaded boss. The fastener has a frangible portion which separates upon a predetermined clamping force being exerted on the membrane by the retainers which also retards unauthorized removal of the fastener once the retaining members are in the clamped relationship. A method for securing the flexible sheet to the roofing also is presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.