초록 ▼

There is disclosed a longitudinal member for a helicopter blade made by placing inside an open mold an open outer covering on which covering and in contact with are arranged a number of uncured axial straps which define top and bottom backs of the longitudinal member itself; the straps being compact

There is disclosed a longitudinal member for a helicopter blade made by placing inside an open mold an open outer covering on which covering and in contact with are arranged a number of uncured axial straps which define top and bottom backs of the longitudinal member itself; the straps being compacted, prior to closure of the mold, against a center core and a front nose by inserting a rear element made of prehardened synthetic composite material, the rear element having an essentially C-shaped section and the opposite side edges of the outer covering being folded thereover prior to closure of the mold.

대표청구항 ▼

Method for manufacturing a longitudinal member (1) for a helicopter blade, the method being characterized by the fact that it comprises the steps of opening a curing mold (21) having an inner shape which matches the outer shape of the longitudinal member being formed; lining a portion of said mold w

Method for manufacturing a longitudinal member (1) for a helicopter blade, the method being characterized by the fact that it comprises the steps of opening a curing mold (21) having an inner shape which matches the outer shape of the longitudinal member being formed; lining a portion of said mold with a portion of a number of cloth strips (7) made of uncured synthetic composite material to form an outer covering (6) for said longitudinal member; placing a nose (10), made of uncured synthetic composite material, on said cloth strips; laying a number of axial straps (17), made of uncured synthetic composite material, on said outer covering (6) and on opposite sides of a removal core (25) disposed in said mold and covered with a strip (5) to provide an inner core (4) for said longitudinal member and form top (15) and bottom (16) backs for said intermediate body (9); inserting into said mold a rear element (18), made of prehardened synthetic composite material and having a C-shaped section, and contacting the covered core (25) and laterally contacting said straps (17) therewith; applying pressure on said straps (17) against said nose (10) and said outer covering (6) and inner cover (4); folding the side edges of said outer strips (7) and overlapping the same with each other and with said rear element (18); and closing said mold.