Patent · US Expired

Method and apparatus for producing a structural unit made of fiber reinforced material

US6517769B2 · kind B2 · utility

1Cited by

7References

14Claims

0Family size

Assignee

Eurocopter Deutschland GmbH · DE

Inventors

Peter Eschenfelder · Waldkraiburg, DE
Walter Oefner · Otterfing, DE

Key dates

Filing date	May 29, 2001
Grant date	Feb 11, 2003
Priority date	—
Expiry date	May 29, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/231
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

For producing a structural component of fiber-reinforced material by a resin transfer molding process, a preform unit is inserted in a form tool including upper and lower metal molds enclosing the perform unit therebetween, without a seal between the molds. The preform unit includes a resin-impregnatable and curable preform body of reinforcing fibers, and an envelope that encloses the preform body and includes an envelope sleeve and closures with valves at the two ends thereof. The sealed envelope is evacuated around the preform body through one valve, and resin is injected through the other valve. The envelope prevents resin discharge from the unsealed form tool during resin impregnation of the preform body.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.