Fastener for cellular sandwich panel
Abstract
Abstract AN IMPROVED POTTED FASTENER FOR HONEYCOMB PANELS INCLUDES AN ANTI-ROTATION PROJECTION, THE SHAPE AND LOCATION OF WHICH IS COORDINATED WITH A POTTING AND VENT HOLE IN THE FASTENER HEAD TO ALLOW FREE FLOW OF THE POTTING COMPOUND OVER THE ENTIRE LENGTH OF THE STEM INSIDE OF THE HONEYCOMB. THIS IMPROVES THE SHEAR TRANSFER, SONIC FATIGUE, AND SEALING CHARACTERISTICS OF THE INSTALLED FASTENER. MOREOVER, THIS PROJECTION IS LOCATED SO THAT (1) AN ADDITIONAL LOAD PATH FOR THE TRANSFER OF A TENSION LOAD ON THE SHANK OF THE FASTENER IS PROVIDED INTO THE POTTING MATERIAL, AND (2) COMPLETE REMOVAL OF THE CORE AND CURDED ADHESIVE FROM THE FACE SHEETS DURING INSTALLATION IS NOT NECESSARY. THIS FASTENER ALSO INCLUDES A LIP ON ITS HEAD FOR LOCATION WITH THE ADJACENT PANEL FACE SHEET. RELATIVE MOVEMENT IS THEREBY PREVENTED ASSURING THE INSERTED FASTENER TO FACE SHEET LOAD PATH AS WELL AS A GOOD SEAL WHERE REQUIRED.
Inventors
- 👤 Louis G Darby
- 👤 John J Grosko Jr
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |