Flexible girder with high energy absorption, and landing gear and tail skid for an aircraft equipped with such a girder
US4645143A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1984 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Nov 2, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C2025/325
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The flexible girder made of composite materials and with high energy absorption is in the form of an elongate box of laminated structure comprising two rigid flanges (6,7) connected by two webs (9) which have aligned apertures (13). A deformable energy-absorbing block (14') is arranged between the two flanges (6,7) at the apertures and comprises a block of an elastomeric material (15). The block (14') absorbs the buckling deformation energy of the flange (6) which is subjected to compressive stress during flexion of the girder, by resting on the other flange (7) which is subjected to tensile stress. The block (14') controls the buckling of the flange (6) and only gives back part of the energy absorbed. Application to the equipment in particular of skid landing gear for helicopters and tail skids for aircraft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.