Helmet having anti-lift device
US4075715A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 1976 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Nov 15, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA42B3/228
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A helmet useful for crew members of an aircraft from which they may be ejected at high speeds comprises a shell over which there is a visor housing containing a visor which can be pulled down over the face of the searer. An anti-lift device in the form of a flange protrudes from the visor housing and extends from a position near a forward side edge of the visor housing and passes around and across the top crown area to a position near the opposite forward side edge of the visor housing. The flange rises from a lowest elevation near the forward side edges to a highest elevation at the top crown area. The regions adjacent the forward side edges constitute wings at a negative angle of attack against wind blase and the region in the vicinity of the top crown area constitutes a spoiler producing turbulence to spoil upward lift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.