Abstract: Novel aircraft for vertical and horizontal flight having powered air acceleration means installed within its structure drawing air thereinto and delivering the resulting airflow upon airfoils installed in opposed pairs on opposite sides of its exterior structure thereby producing lift without forward travel of the aircraft.

Abstract: Novel aircraft for vertical and horizontal flight having powered air acceleration means installed within its structure drawing air thereinto and delivering the resulting airflow upon airfoils installed in opposed pairs on opposite sides of its exterior structure thereby producing lift without forward travel of the aircraft.

Abstract: A lathe chuck is disclosed which includes a plurality of gripping jaws actuated by jaw screws. The screws are rotatably mounted in openings extending radially from the central bore of the chuck. The screws include a central passageway having a spring-biased plunger therein which is adapted to be caused to project from the passageway, across the chuck bore, and into engagement with the passageway of a diametrically opposed jaw screws. With the two jaw screws thus interlocked, they may be rotated together by turning only one jaw screw, thereby moving the opposed, linked gripping jaws in unison an identical distance in one direction. The chuck also includes means for the microadjustment of each jaw position, means for interlocking the movements of selected jaws for simultaneous convergence, and means for immobilizing the gearing means and thereby those jaws then engaged; it provides for repetitive return of the coordinated jaws to a prior position, and automatic centering of round stock.

Abstract: An air lift mechanism has one or more rotating discs within wells in a top deck. Each disc has cambered convexities on its upper surface. A cylindrical wall of each well has operational ports.

Abstract: Hub which may be integral with a pulley, gear, sprocket, etc. has keyhole slots extending radially from its bore into a hub body lengthwise of the hub, with a perpendicular screw and sleeve screw across said slots to compress them and reduce the hub bore opening to clamp the hub onto a shaft, and to expand such slots to release the hub from the shaft; a headless screw immobilized in threads below the slot extends into the coaxial sleeve screw above the slot having external and internal threads of different but proximate pitch, rotation of which applies greatly multiplied thrust upon the screw to push or pull the hub body below the slot; other embodiments include an internal annular slot in the hub bore compressed by an axially placed screw assembly or screw along, and diametral slots similarly compressed and expanded, and a dual thread screw with differential pitch.