Abstract: A gear system includes gears that each have a tooth flank profile that includes a convex addendum and a concave dedendum, and when in mesh satisfy the Euler Savory equation for conjugacy with contact over the entire tooth flank such that lines of contact are unbroken. The portion between the addendum and dedendum is an involute or other geometric curve.

Abstract: A gear system includes gears that each have a tooth flank profile that includes a convex addendum and a concave dedendum, and when in mesh satisfy the Euler Savory equation for conjugacy with contact over the entire tooth flank such that lines of contact are unbroken. The portion between the addendum and dedendum is an involute or other geometric curve.

Abstract: A gearing system which includes a pair of conjugate gears. The tooth profile of the first gear lies entirely within the pitch circle of the first gear, and the tooth profile of the mating gear lies entirely outside the pitch circle of the mating gear. The profile of the first gear is fully or partially concave, and the tooth profile of the mating gear is fully or partially convex. The profiles of the conjugate gear pair may have constant, or nearly constant, relative curvature. Alternatively, due to the shape of the profiles, constant, or nearly constant, contact stress results when the gears are in mesh.

Abstract: A gearing system which includes a pair of gears. The tooth profile of the first gear has three portions: a concave portion lying within the dedendum of the first gear, a convex portion lying within the addendum of the first gear, and a transition zone disposed between the concave and convex portions. Similarly, the tooth profile of the mating gear has three portions: a concave portion lying within the dedendum of the mating gear, conjugate to the convex portion of the tooth profile of the first gear; a convex portion lying within the addendum of the mating gear, conjugate to the concave portion of the tooth profile of the first gear; and a transition zone disposed between the concave and convex portions. The pair of gears may be designed such that no contact between meshing teeth is made along the transition zones. The tooth profiles of the gear pair have constant, or nearly constant, relative curvature.

Abstract: A three-dimensional movable gunnery target comprises an envelope of flexible material such as rubber, neoprene, plastics material or fabric, which is rapidly dilatable to a predetermined shape, for example by internal gas pressure from a chemical or pyrotechnic device, or from a compressed gas bottle. The target, which is capable of rolling under the action of wind or gravity, encloses an axle from which a compressed gas bottle is suspended.