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US 4,494,910 AGranted
Large surface structural component, especially rotor blade
AssigneeMesserschmitt-Boelkow-Blohm GmbH
InventorsMichael Hahn, Franz Sperber
Life of this patent
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AssigneeMesserschmitt-Boelkow-Blohm GmbH
InventorsMichael Hahn, Franz Sperber
Estimating the term…
A large surface structural component, such as a rotor blade for a windmill r a blade root for a windmill rotor, includes a hollow core (6) of foam material supporting a shell (8, 11) of fiber reinforced synthetic material. Positive templates in the form of disks (5) are inserted into the core (6). These templates are preferably spaced from each other along the length of the structural component and have a shape which defines the cross-sectional contour of the finished component. Thus, initially foam sections having a shape convenient for their production and these templates are assembled on a rotatable arbor (2) which is then rotated in a machining operation such as cutting and/or grinding on a lathe type machine. The shape of these templates (5) provides a guide for the machining operation which is thus substantially facilitated while simultaneously permitting the use of foam cores having initially plane surfaces.
A large surface structural component, such as a rotor blade, having a given cross-sectional finished contour, comprising a plurality of support core sections of foam material forming a support core, said support core sections initially having an excess dimension, a plurality of disk type positive templates inserted in said support core so that each disk type positive template is rigidly connected to two adjacent core sections for interconnecting the core sections in a force transmitting manner, said disk type positive templates having a circumferential contour corresponding at least partially or substantially to said given cross-sectional finished contour of the structural component for defining a guide limit for a subsequent machining operation on said core sections for removing said excess dimension of said core sections, and a shell of fiber reinforced material for enveloping said support core.
Dependencies are inferred from the claim text.