Abstract: A door assembly for protecting structural enclosures with an opening with a frame assembly mounted to and surrounding the opening. The enclosures are typically storm shelters. A door panel is hingedly mounted to the frame assembly along a longitudinal hinge axis. Outer and inner lever assemblies are pivotally mounted to fixed reference axes outside of the frame assembly. Force multipliers provide the torque necessary to move the door panel between two extreme positions. The lever assemblies used to create the pertinent moments of force are telescopic, having the longest dimensions that the space permits. Users can readily open and close the heavy hingedly mounted door assemblies. To further facilitate the smooth opening and closing of the door panel, gas spring assemblies and/or coil springs can be utilized.

Abstract: A floating exercise rowing machine with two elongated floating assemblies that are kept at a parallel and spaced apart relationship with respect to each other by two transversal frame assemblies and a longitudinally extending frame assembly. The frame assemblies support a seat assembly mounted at the middle of the floating exercise machine. A propulsion mechanism that includes a bar that is pivotally mounted to the frame assembly with a coaxially extending actuating end that moves reciprocally between two extreme positions to cause, through linkage arms, the rotation of sprockets that in turn impart a rotational movement to a transversal axle that supports two paddle wheels at the ends. A steering mechanism permits a user to steer the floating machine with his/her hands.

Abstract: A floating exercise rowing machine with two elongated floating assemblies that are kept at a parallel and spaced apart relationship with respect to each other by two transversal frame assemblies and a longitudinally extending frame assembly. The frame assemblies support a seat assembly mounted at the middle of the floating exercise machine. A propulsion mechanism that includes a bar that is pivotally mounted to the frame assembly with a coaxially extending actuating end that moves reciprocally between two extreme positions to cause, through linkage arms, the rotation of sprockets that in turn impart a rotational movement to a transversal axle that supports two paddle wheels at the ends. A steering mechanism permits a user to steer the floating machine with his/her hands.