Abstract: A hinge for joining and aligning two panels includes hinge leaves, each having an integral projection for insertion into a recess in one of the panels. Each of the leaf projections is disposed along an imaginary right circular cylinder having its center axis intersecting the hinge axis and the center axis of the imaginary cylinder of the other leaf projection. When the leaves are positioned in parallel, opposing relationship, the axes of the imaginary cylinders are coincident and the alignment of the hinge axis can be adjusted by rotating the hinge when it is inserted into hinge-mounting recesses that allow for such hinge rotation, such as arcuate. A hinged panel assembly includes the hinge mounted in arcuate grooves that allow for hinge rotation, such as semicircular grooves. The semicircular grooves are formed by clamping the panels together in alignment and cutting a substantially circular groove that is bisected by the joint between the panels.

Abstract: A windmill having a gearbox, tail and wheel is disclosed in which a mast is secured to the windmill and is rotatable as a unit within a mast housing secured to the tower. A pull-out assembly exerts an axial downward force on a pull-out tube concentrically positioned within the mast. A mounting hub on the drive shaft supports the wheel at taper bearing surfaces. The individual sails are adjustably secured to one or more concentric, segmented rings attached to the mounting hub by radial spokes or braces.