Helicopter blade longitudinal member and relative manufacturing method
First Claim
1. 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.
4 Assignments
0 Petitions
Accused Products
Abstract
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.
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Citations
6 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6)
- 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;
Specification