Abstract: An exercise device is disclosed for use in exercising and strengthening abdominal and lower back muscles. The device is easily utilized, can be disassembled and is portable. The device utilizes an elongated resilient spring member, which can be interchanged for varying degrees for resistance. The elongated resilient spring member is demountably affixed to the seat portion of the device. The upper portion of the elongated resilient spring member features has an attached roller pad as an upper body support on one side and a handrail element on the other side. The handrail element is mounted by an adjustable clamp that grips the cross section of the handrail to vary the frictional resistance against the raising and lowering of the handrail. The rotatable hand grips of the handrail are mounted with lock pins for adjustment by the user.

Abstract: An abdominal exercise device is disclosed which comprises a base support member assembly upon which the user sits, a vertical resistance and restorative force member assembly mounted on the base support member assembly, and an arm support member. The arm support member positions the body of the user in an upright position. The invented exercise device permits the user to train and strengthen the major and minor muscles of the upper and lower back, to train the frontal portion of the midsection, the abdominals, the obliques to avoid spinal compression and to maintain decompression of the spinal vertebrae.

Abstract: The present invention relates to a method for rapid fabrication of molds and mold components. This method involves first the step of producing a digital CAD representation of the mold; using this digital representation to make a set of oversized core and cavity three dimensional models, patterns or replicas, by using solid modeling technologies; placing these models, patterns or replicas respectively into a mold base with die pockets to accept the patterns; powder injection molding fine metal powders around each version of the core and cavity of the part to produce a "green" molded article having the negative or female impression or the original core and cavity patterns; debinding these "green" articles to remove the binder; sintering the debound articles to produce the final tool steel or related alloy molds; and performing secondary operations to fit then into a master mold base as part of a complete molding tool.