Abstract: Gear silhouettes in the axial plane are tailored to give substantially constant tooth load per unit length of contact are as well as constant position of the resultant tooth load, even though the number of teeth in contact fluctuates. These tailored silhouettes help to minimize noise, bearing vibration and dynamic-load tooth-stresses.

Abstract: Novikov gearing obtains its exceptional tooth surface load capacity by using concave-convex circular arc profiles of nearly the same radii, so that the contact area between mating teeth is very large and the Hertzian stress low. Because the centers of these arcs are very close together, a small error in center-distance produces excessive changes in pressure angle and overloads the tips of the concave teeth. The subject invention eliminates this problem by using profile curves having a radius of curvature that increases with distance from the pitch circle. The discrete arc centers of Novikov gearing are replaced by continuous evolute curves which are positioned to be tangent to the pressure line near the point where it passes through the pitch point. This allows much closer profile conformity for a given center-distance error, reducing surface stresses and increasing torque capacity.

Abstract: A safety latch for holding a door in its locked position or in a partially open position to enhance security. A bar for holding the door in either position is provided, together with a swingable keeper cooperating with the bar to perform the holding functions. The holding means for holding the bar in the door locked position is slidably supported on the bar for movement into and out of keeper holding position.

Abstract: A safety latch for holding a door in its locked position or in a partially open position to enhance security. A bar for holding the door in either position is provided together with keepers cooperating with the bar to perform the holding functions. The said bar may be mounted to take the place of one hinge pin.

Abstract: A door lock for use with an elongated rod used as an auxiliary holding device in addition to the conventional door lock. The auxiliary door holding rod is actuatable from outside the door by means of a conventional key actuated lock so as to permit the auxiliary safety rod to be moved between locked and unlocked positions from outside the door as well as from inside the door. A lost motion device is incorporated in the connection between the door lock and the rod holder to prevent interference between the lock structure and the internal manual actuation of the rod holder.

Abstract: A safety bar for holding a closure such as a door in its locked position or in a partially opened position to enhance security. A bar for holding the closure in either position is provided together with keepers cooperating with the bar to perform the holding function.

Abstract: A type of internal cycloidal gearing based on the principal that different size generating circles rolling inside a directing circle which has a diameter equal to the sum of the diameters of the generating circles generate identical hypocycloids, and, similarly, a generating circle that surrounds a directing circle and gyrates around it like a "hula-hoop" generates the same epicycloid as a small circle having a diameter equal to the difference in the diameters of the surrounding "hula-hoop" circle and the directing circle.

Abstract: A roller bearing construction that eliminates the need for a cage or separator to align and position the rollers. Gear teeth formed on the rollers and races function as spaced apart planetary gear sets to insure correct roller alignment and spacing, reducing friction and wear and increasing load capacity.

Abstract: Gear tooth profiles that afford greater torque capacity than is obtainable from involute gears of corresponding size and materials. Maximum contact stress is reduced by using profile curves that give exceptionally long radii of relative curvature at the pitch point, and interference problems with such profiles are avoided by utilizing a two-segment line of action. When the gears are not carrying a torque load each tooth profile in the transverse plane passes successively through two points of contact but are out of contact at points in between. As the torque load increases, the two contact zones widen until they coalesce.

Abstract: A safety latch for holding a closure such as a door in its locked position or in a partially open position to enhance security. A pair of swingably connected links are provided in combination with a keeper. In one position of the links the closure is held against opening and in another position of the links the closure is held against further opening from a partially opened position.

Abstract: A system of helical or spiral bevel gearing that by violating the "law of gearing" restricts the tooth action entirely to the pitch point. The greatly reduced sliding velocity between the teeth of mating gears permits them to be made of "dry bearing" or other moldable materials without exceeding rated PV values, and a multiplicity of contact points moving transversely along the pitch line insures continuity of action.