Pressure differential fastener release mechanism

A system for releasably securing a first part to a second part, said system comprising:

• a shank section of a fastener configured to pass through a bore in said first part and mate with said second part, said shank section having an outer surface and a sealed, airtight cavity disposed therein, said sealed cavity having a first pressure within it;
• a head section of said fastener radially-extending from a distal end of said shank section, said cavity extending through said head section with a plug disposed therein sealing said cavity, said head section having a lower surface for abutting said first part with at least one passage disposed therein radially-extending between an outer surface of said head section and said outer surface of said shank section;
• a holding section attached to said shank section distant from said head section, said holding section configured to pass through said bore in said first part and mate with said second part, said head section capable of securing said first part against said second part;
• and
• a fracture seam disposed on said outer surface of said shank section within said bore, said at least one passage providing access for a fluid surrounding said system to enter said bore and surround said outer surface of said shank section, said fracture seam designed to cause said shank section to fracture when a pressure differential between the ambient pressure of said fluid and said first pressure exceeds a design pressure differential, releasing said first part from said second part.

A system for releasably securing a fastener to a first part, said system comprising:

• a shank section of said fastener configured to pass through a bore in said first part and mate with said first part, said shank section having an outer surface and a sealed, airtight cavity disposed therein, said sealed cavity having a first pressure within it;
• a head section of said fastener radially-extending from a distal end of said shank section, said cavity extending through said head section with a plug disposed therein sealing said cavity, said head section having a lower surface for abutting said first part with at least one passage disposed therein radially-extending between an outer surface of said head section and said outer surface of said shank section;
• a holding section attached to said shank section distant from said head section, said holding section configured to pass through said bore in said first part and mate with said first part;
• and
• a fracture seam disposed on said outer surface of said shank section within said bore, said at least one passage providing access for a fluid surrounding said system to enter said bore and surround said outer surface of said shank section, said fracture seam designed to cause said shank section to fracture when a pressure differential between the ambient pressure of said fluid and said first pressure within said cavity exceeds a design pressure differential, releasing said head section of said fastener from said first part.