Abstract: The present disclosure relates generally to building surface products, for example, panels suitable for forming a building surface. The present disclosure relates more particularly to a building surface product including a gypsum panel with an upper edge that overlaps a lower edge of a neighboring gypsum panel.

Abstract: A two-stroke barrel engine includes a power output shaft configured to rotate, an even number of cylinders encircling the power output shaft, wherein each cylinder includes opposing first and second power pistons configured to reciprocate within their respective power cylinder, and a pair of non-rotating wobbleplates opposed and hingedly connected to the power pistons. The wobbleplates are configured to transfer the reciprocating motion of the power pistons to rotary motion of the power output shaft via a nutating motion of the non-rotating wobbleplate.

Abstract: A two-stroke barrel engine includes a power output shaft configured to rotate, an even number of cylinders encircling the power output shaft, wherein each cylinder includes opposing first and second power pistons configured to reciprocate within their respective power cylinder, and a pair of non-rotating wobbleplates opposed and hingedly connected to the power pistons. The wobbleplates are configured to transfer the reciprocating motion of the power pistons to rotary motion of the power output shaft via a nutating motion of the non-rotating wobbleplate.

Abstract: A hearing aid system including an electronic hearing aid containing a microphone and having an orifice in one part thereof for transferring sound to the microphone and an acoustically amplifying horn formed with an outwardly flared end defining an inlet opening for sound originating ahead of the horn and an open downstream end attached to the part of the hearing aid containing the orifice such that the orifice is enclosed and sealed off from exposure to sound originating outside of the horn except for that sound entering the inlet opening.

Abstract: A forwards facing rowing apparatus wherein the usual pair of sweep hinges is replaced by a single, common axis, sweep hinge system mounted to and rockable with the oarlock mainframe and wherein a blade feathering mechanism including a coupling device such as a pair of swing gears is employed at the oarset including a handle loom and a blade loom, one of the gears being driven from a rotating handle at the in-board end of the handle loom while the mating gear drives or rotates the blade at the outer end of the blade loom. Each gear may be affixed to a rotatable member such as a torque shaft extending along the handle and blade looms and connected at opposite ends to both the handle and blade, respectively. Alternatively, the handle and blade looms may be rotatable members and one of the pair of gears may be attached to each member.

Abstract: An oar and oarlock arrangement comprising, in combination: a handle loom and a structurally separate blade loom having a hydrofoil blade mounted to its outermost end, the handle loom and blade loom being hinged for sweep action about a rockable oarlock. The handle and blade looms are interconnected by a motion reversing linkage such as a pair of gears, for example. A feathering linkage is provided between the main frame of the oarlock and the hydrofoil blade for changing the angle of attack of the blade in the water.

Abstract: A rowing apparatus comprising, in combination: a boat having a hull with fore and aft ends and having an outrigger projecting laterally outwards from each side of the hull and at least two oars located one on each side of the hull, each of the oars comprising an L shaped oarloom including two legs joined at an elbow, one of the legs constituting a handle loom having a generally athwartship position at mid-stroke and the other leg constituting a blade loom laying generally fore and aft to the boat hull at mid-stroke and having an outer end. A blade having a hydrofoil shaped surface is mounted to and below the outer end of each blade loom, the blade lying in a generally vertical plane which at mid-stroke is located at a divergent angle with respect to the plane of the blade mounted to the oarloom on the opposite side of the hull.The rowing apparatus further includes a seat for the oarsman which is movably mounted to the hull and foot restraints for securing the feet of the oarsman.

Abstract: A rowing apparatus comprising, in combination: a boat having a hull with fore and aft ends and an outrigger frame movably mounted onto the hull and having opposite ends projecting laterally outwards from each side of the hull. The apparatus further includes at least two oars located one on each side of the hull, each of the oars comprising an L shaped oarloom including two legs joined at an elbow, one of the legs constituting a handle loom having a generally athwartship position at mid-stroke and the other of the legs constituting a blade loom lying generally fore and aft to the boat hull at mid-stroke and having an outer end. A sweep hinge member is mounted onto each opposite end of the outrigger frame and is adapted to rotate about a substantially vertical axis, the sweep hinge member including an oarlock frame adapted to mate with the L shaped oarloom of one of the oars at about the elbow.

Abstract: The present invention improves the efficiency of high performance rowing in shells. The oarsman faces forwards and uses "L" shaped oars with hydrofoil blades. The conventional handle loom section ends at the "L" at the outboard end of the usual outrigger. The "L" is supported by a special oarlock pivoted in the usual manner outboard by the outrigger. The blade loom section of the oar trails the oarlock and carries at its aft end a downwards projecting hydrofoil blade which is angled diverging forwards relative to the opposite blade. A teter pivot, horizontal in the oarlock, is angled to generally bisect the right angle of the "L" and supports of offset center of gravity of the "L" shaped oar. This pivot provides for raising and lowering the blade to the water by the handle in the conventional manner. The action of the hydrofoil blades in the water is to swing laterally outwards during the power stroke and to be raised from the water on the return stroke.