Patent ID: 9555871
Date: 2017-01-31
CPC Classifications: B64C,B64D,F01D,F02K,F04D,F05D,Y02T,Y10T

Claim:
1. A sandwich structure, comprising: a first skin and a second skin arranged on top of one another and separated from one another by a hinge assembly sandwiched between the first and second skin to form the sandwich structure having a closed cross-section, the hinge assembly comprising; the first skin is expandable relative to the second skin in a circumferential direction of the sandwich structure, the circumferential direction circumscribing a central axis; the first and second hinge member moving in response to expansion of the first skin relative to second shin in the circumferential direction; the first skin moving relative to the second skin in a radial direction in response to expansion of the first skin relative to the second skin in the circumferential direction; the hinge assembly preventing movement of the first skin relative to the second skin in the circumferential direction while: