公开(公告)号：CA1110604A

公开(公告)日：1981-10-13

申请号：CA326994

申请日：1979-05-04

Applicant: UNITED TECHNOLOGIES CORP

Inventor： FERRIS DONALD L ,  HIBYAN EDWARD S ,  FAIZ ROBERT L

IPC: B64C27/32 ,  B64C27/35 ,  B64C27/48 ,  B64C11/06 ,  B64C27/04

Abstract: ELASTOMERIC HELICOPTER ROTOR LOAD REACTION SYSTEM A helicopter rotor having one or more blades mounted for rotation with the rotor hub and each supported therefrom by an elastomeric bearing, and having a lead-lag damper connected to the blade and the hub and extending substantially parallel to the blade axis, and including the improvement of apparatus for preventing tension loading of the elastomeric bearing as the blade moves radially inwardly as a result of rotor braking.

公开(公告)号：CA1273772A

公开(公告)日：1990-09-11

申请号：CA533346

申请日：1987-03-30

Applicant: UNITED TECHNOLOGIES CORP

Inventor： FAIZ ROBERT L ,  WALKER WILLIAM J ,  RAMEY PHILIP ,  ADAMS KENNETH M ,  FLONC NICHOLAS P ,  NGUYEN DEAN

IPC: B29C33/40 ,  B29C33/44 ,  B29C33/52 ,  B29C33/64 ,  B29C33/76 ,  B29C61/00

Abstract: Removable Irreversibly Shrinking Male Mandrel A shrinkable foam mandrel that can be easily removed and composite resin transfer molding process that uses the foam mandrel. The foam is dimensionally stable at a first temperature that typically corresponds to the cure temperature of the composite resin. The foam is capable of irreversibly shrinking to less than about 0.5 said foam's original size at a second temperature that is above said first temperature. the foam is encapsulated by a non-stick elastomer skin and covered with fibers. The fiber covered elastomer encapsulated foam is disposed in a female mold cavity and resin is injected into the female mold cavity. The resin and fibers are cured and the resulting composite component is removed from the female mold. The temperature is raised to the second temperature and the elastomer encapsulated foam male mandrel irreversibly shrinks to less than about 0.5 its original size. Finally the shrunken male mandrel is removed from said composite component. These mandrels are a solution to the aerospace industry's flyaway mandrel problem as they are lightweight and can easily be removed from the composite component.