Abstract: An anodized aluminum sheet is prepared by applying an aqueous polyurethane 40 percent dispersion coating with a threaded roller having 20-1/32 inch deep triangular threads per inch. The coating is heated by graduated heating from about 125 degrees F. to about 240 degrees F. for about 20 minutes until the material is set and non-tacky. Thereafter, without special storage or handling requirements, the coated side of the anodized aluminum is bonded in a mold under reaction injection molding pressure to a reaction injection molding material.

Abstract: A reaction injection molded recreation board with spaced rectangular reinforcing rods. The rods are rectangular in cross section and are disposed between upper and lower surfaces of the board. Position clips maintain the reinforcing rods in mutually spaced relationships within an injection mold during the process of injecting foam plastic. The structure of the positioning clips is also disclosed.

Abstract: A slideable toe piece has rearward extensions which are cam locked in place in tunnels in the fixed heel piece.

Abstract: A molded ski has a preformed core rigidly attached to an inner plate and to an outer deck plate. The strength and density of the core is distinct from the strength and density of the remaining ski body.

Abstract: A slidable toe piece has rearward extensions which are cam locked in place in tunnels in the fixed heel piece.

Abstract: A flexible foot binder is held in a slideable assembly which has upward facing detents along opposite sides. Inward opening slideways have over-the-center eccentric cam locks mounted on transverse pins. The cams engage the detents to press the slide assembly downward on the ski and to prevent motion of the slideable assembly.

Abstract: A pre-shaped aluminum plate is held against the flat end wall of an inverted mold cavity by vacuum pressure communicated through bore holes in the wall leading to a vacuum chamber in the mold body. A high temperature PTFE gasket shaped to match the plate fits in an annular recess in the wall to provide a seal between the wall and plate. Polyurethane foam expands and hardens in the mold cavity to further press the plate against the wall and to form a foamed plastic water ski having a flush aluminum deck. The mold cavity has a curved side wall to produce a ski having a radiused edge about the deck.

Abstract: A pre-shaped aluminum plate is held against the flat end wall of an inverted mold cavity by vacuum pressure communicated through bore holes in the wall leading to a vacuum chamber in the mold body. A high temperature PTFE gasket shaped to match the plate fits in an annular recess in the wall to provide a seal between the wall and plate. Polyurethane foam expands and hardens in the mold cavity to further press the plate against the wall and to form a foamed plastic water ski having a flush aluminum deck. The mold cavity has a curved side wall to produce a ski having a radiused edge about the deck.

Abstract: A pre-shaped aluminum plate is held against the flat end wall of an inverted mold cavity by vacuum pressure communicated through bore holes in the wall leading to a vacuum chamber in the mold body. A high temperature PTFE gasket shaped to match the plate fits in an annular recess in the wall to provide a seal between the wall and plate. Polyurethane foam expands and hardens in the mold cavity to further press the plate against the wall and to form a foamed plastic water ski having a flush aluminum deck. The mold cavity has a curved side wall to produce a ski having a radiused edge about the deck.