Abstract: The exercise apparatus comprises a frame and a carriage. A resistance system resists movement of the carriage with respect to the frame and the longitudinally headward direction. The resistance system allows the resistance to be changed at the head end portion of the frame and further does not require elastic members to travel with the carriage when they are not use. The rebound system that adjusts the range of motion of the carriage comprises two flexible members attached to the carriage and the frame and a resistance member is attached to a central portion of the flexible members and resists lateral seperation of the central portions of the flexible members.

Abstract: This allows for modular floating gardens that can be fabricated into forms chosen by the end user to be aesthetically pleasing even before planting has matured. Because composite floating gardens created from these modules can be large, their form can be pleasing from a distance. Because these are significant structures, they can be incorporated into a process to improve water quality.

Abstract: An improved rotary engine and method for determining the contours of the sealing surfaces thereof. The improved engine provides for maintaining a predetermined, optimal gap between the sealing surfaces during rotation. The gap may be parallel or angled, and may be positive or negative so as to form an interference engagement. The rotors of the engine may be provided with mirror-image sealing surfaces so as to prevent development of excessive back-lash and clearance, and also to permit efficient reverse operation. The sealing surfaces may also be provided with recesses for interrupting the seal at predetermined points in the rotational cycle, for enhanced wear characteristics and/or to accommodate abrasive or shear-sensitive fluids.

Abstract: A shelf section adapted to fit against a wall section where there are exposed 2×4 wooden posts at spaced intervals. The shelf section has a horizontal platform, part of which is positioned between adjacent 2×4 posts, and the other part extending outwardly from the posts. A pair of mounting flanges attach to the outer surfaces of the 2×4s, and a pair of braces extend between the flanges and the platform. The shelf section is designed to be made from a single metal sheet cut to the appropriate dimensions and configuration, and is arranged so that a plurality of shelf sections can next within one another for storage, transportation, etc.

Abstract: A flow meter comprising a rotor assembly that is comprised of two rotors having axis of rotation offset from collinear where the two rotors define operating chambers that changing volume with respects to rotation and allow fluid to pass from an inlet port to an outlet port when the number of rotation is indicated the volumetric flow therethrough.

Abstract: An improved rotary engine and method for determining the contours of the sealing surfaces thereof. The improved engine provides for maintaining a predetermined, optimal gap between the sealing surfaces during rotation. The gap may be parallel or angled, and may be positive or negative so as to form an interference engagement. The rotors of the engine may be provided with mirror-image sealing surfaces so as to prevent development of excessive back-lash and clearance, and also to permit efficient reverse operation. The sealing surfaces may also be provided with recesses for interrupting the seal at predetermined points in the rotational cycle, for enhanced wear characteristics and/or to accommodate abrasive or shear-sensitive fluids.

Abstract: An engine has a pair of rotors, both housed within the same housing. The housing has an interior cavity which is preferably spherical but need only be partially spherical, the remainder at least having rotational symmetry. Each rotor is mounted on an axis that passes through the center of the cavity, the respective axes of the rotors being at an angle to each other, with the center of each rotor being at the center of the cavity. The rotors interlock with each other to define chambers. Vanes or pistons defined by a contact face and a side face protrude from the rotors. The side faces and contact faces, and the housing interior define chambers that open and close as the rotors rotate. Each contact face of one rotor is defined by the rotation of a conical section of material on the other rotor, so that there is constant linear contact between opposing vanes on the two rotors, at least on one side of the engine. The rotors may face each other or be one inside the other.