Abstract: A spinnaker, a large, substantially triangular sheet of flexible material with a front face and two side peripheral edges, is attached to a mast of a sail boat. A ram-air inflatable beam for use with the spinnaker includes a tube, an air inlet and a valve. The tube is formed by a rectangular sheet of flexible material which has a first end edge, a second end edge and two side edges. The two side edges are disposed perpendicular to the mast and are mechanically coupled to the front face of the spinnaker extending from one side peripheral edge to the other side peripheral edge thereof to form a first open end and a second open end. The air inlet includes a stiffening member and an extended scoop which are mechanically coupled to the tube at the first open end and lets air into the tube. The valve includes a loose flap of cloth and an anchor.

Abstract: The present invention is an orthopedic chair which may be used to assist an invalid to easily sit therein or to rise therefrom. The orthopedic chair includes a frame and a seat which is pivotally coupled to the frame at the front thereof, a back which is mechanically coupled to the frame, a right arm-rest and a left arm-rest both of which are mechanically coupled to the frame. The orthopedic chair also includes a spring tensioning mechanism which resiliently biases the seat, when it is in its first position, toward its second position and a releasing mechanism which releases the seat so that the spring tensioning mechanism moves the seat from its first position to its second position.

Abstract: The present invention is an orthopedic chair which may be used to assist an invalid to easily sit therein or to rise thereform. The orthopedic chair includes a frame and a seat which is pivotally coupled to the frame at the front thereof, a back which is mechanically coupled to the frame, a right arm-rest and a left arm-rest both of which are mechanically coupled to the frame. The orthopedic chair also includes a spring tensioning mechanism which resiliently biases the seat, when it is in its first position, toward its second position and a releasing mechanism which releases the seat so that the spring tensioning mechanism moves the seat from its first position to its second position.