Abstract: A gear assembly has a driving pinion, a rack and an intermediate gear coupling the pinion and rack. The teeth of the pinion, gear and rack are of the same pitch, the teeth of the intermediate gear being separated into one sector of teeth which engage the pinion and another sector of teeth which engage the rack. The axis of the intermediate gear is off-center, the radii of curvature of the pitched circles of the two sectors of the intermediate gear are different, and the teeth of the two different sectors of the intermediate gear are not integrally related to the circumference of the respective pitched circles.

Abstract: The present invention relates to a bevolute gearing system which transmits torque between non-intersecting shafts at right angles to each other. The bevolute gear system includes a pinion gear which is flat and in one plane. The pinion gear is designed to include teeth which are shaped in the form of an involute spiral. The bevolute gear system includes a second gear which is also designed to include teeth which are shaped in the form of an involute spiral. The second gear is mounted on a non-intersecting axis at a right angle to the axis of the pinion gear. The bevolute gearing system of the present invention reduces the thrust loads to negligible values for the bearings of both the pinion gear and the second gear. In addition, higher mechanical efficiencies, wider tolerances on alignment of the gears, interchangeability between the gear and the pinions to produce different ratios and a substantially eliminated gear noise are a few of the many advantages disclosed in the present invention.

Abstract: A pair of mating spur gears, wherein the teeth of the one spur gear element possess an involute-shaped tooth depth profile and the teeth of the mating spur gear element possess a straight tooth depth profile.

Abstract: A unidirectional gear transmission of reduced axial thickness advantageou employed in timepieces is adapted to be driven by a stepping motor. The driving gear is provided with an alternating pattern of teeth having a first thickness and spacing and sets of two teeth having greater thickness and spacing. The driven gear is provided with an alternating pattern of teeth corresponding to the first thickness teeth of the driving gear and two spaces corresponding to the greater thickness teeth of the driving gear separated by a single tooth. Regular stepping rotation in either sense can be transmitted from the driving gear to the driven gear, but transmission of rotation from driven to driving gear is prevented.

Abstract: The present invention relates to the gear configuration between a pinion and a rack. The pinion forms a plurality of teeth which are received in respective grooves on the rack. The teeth each define a pair of flanks which oppose a pair of surfaces within the groove and the flanks and surfaces substantially define circular arcs. The radius of curvature of the circular arc for the surfaces is slightly larger than the radius of curvature of the circular arc for the flanks. A separating force is generated between the pinion and the rack when rotation of the pinion imparts transverse movement to the rack and the circular arcs of matching surfaces and flanks cooperate to substantially eliminate the separating forces after slight separation between the pinion and the rack.

Abstract: A gear train comprising a drive gear, a driven gear and an idler arranged a common plane so that both drive gear teeth and idler teeth mesh with the driven gear teeth. The teeth are asymmetric and the idler and drive gears are reflections of one another about a line. Rotation can be transmitted in one sense only and in direction from drive gear to driven gear only. The arrangement may be advantageously employed in timepieces such as electric wrist watches where a stepping motor drives time indicating hands.

Abstract: A gear train enables rotational drive in either sense of a driven member le preventing transmission of rotation in either sense from the driven to the driving member. Each member of the train comprises a pair of discs attached on their faces with each disc having asymmetric teeth on its periphery and each disc of the pair being a reflection about a diametral line of the other. The asymmetrics in each member of the train are different.

Abstract: A variable speed and direction power transmission attachment for driving the cutting tool carriage of a lathe or the like, the attachment having sets of intermeshing male and female cog gears. Certain of such sets each comprises a face gear having a plurality of concentric rows of tooth socket elements formed therein. A male cog gear is selectively settable to mesh with any of such rows to change the gear ratio. By changing the combined setting of different sets of gears, a wide variation in overall gear ratio may be obtained to provide many different feeding speeds of the carriage, suitable for general cutting and for screw thread cutting. A reversing mechanism, also constructed of intermeshing cog gears, enables the direction of drive to be reversed or the drive to be disconnected to permit manual drive of the carriage.

Abstract: In lieu of a pair of bevel gears which mesh to rotate about axes inclined to one another, each gear is carried on a cylindrical base having a boss extending from one end and co-axial with the base. Each tooth is integral with both the base and the boss and the adjacent walls of adjacent teeth are parallel for portion of their respective lengths such that the teeth are bulbous. Point engagement exists between the teeth. For a given pair of gears the angle between the axis of rotation can be widely varied.

Abstract: Drive gears with unique teeth profiles drivingly couple the output shaft of a drive on a drum-cutter mining machine to a rack extending along the course of travel of the mining machine. A prime mover on the mining machine is coupled to a drive gearwheel having gear teeth with tooth flanks defined by segments of a hypocycloid. These gear teeth mesh with a rack drive gearwheel having gear teeth with tooth flanks defined by segments of an epicycloid. The gear teeth of the rack drive gearwheel have a slender profile to penetrate into the spaces between pins forming part of a guide rail rack.

Abstract: A hydrostatic gear machine is described which comprises a pair of gear wheels meshing with one another, one of the gear wheels being an internally toothed annular gear wheel and the other an externally toothed pinion, the tooth profile of at least one of said wheels being at least substantially trochoidal; the tooth profile of a first one of the two wheels being defined as being obtained by rolling the first wheel with meshing on the other wheel. The teeth of at least one of said wheels bear the thus defined profile only on a limited zone having a length just sufficient for the ratio of the angles of rotation of the two wheels to be constant throughout rotation of the wheels, and have their profile set back, outside the said limited zone, by a sufficient distance to eliminate contact, outside the limited zone, with the teeth of the other gear wheel.

Abstract: The invention discloses a form of gearing that is radially preloaded and utilizes closely conforming teeth. The preloading ensures that the higher torque capacity of conformal teeth can be realized more fully than in fixed center gearing, and the conformal tooth profiles, if concave-convex, ensure that the amount of preload needed is minimized, since the effective pressure angle for such teeth diminishes as the transmitted torque increases.

Abstract: A sprocket for use with positive drive belts of the type with oppositely facing curvilinear driving surfaces, the sprocket having improved symmetrical teeth with a cross-section profile defined by axially oriented, oppositely facing driving surface portions that extend from the top land of the tooth at an angle of about 15 degrees or less to the sprocket tooth, each driving surface of the sprocket tooth blending into an oppositely facing oblique surface at an angle of about 150 to about 170 degrees that provides a positive clearance between the sprocket tooth and side portions of a meshing belt tooth to direct egress of material away from the sprocket, the oblique surfaces define a sprocket tooth base that is wider than the sprocket tooth top land and bottom land portions between sprocket teeth providing positive clearance between the bottom land portions and belt tooth tips.

Abstract: This is a compatible angled gear system wherein the shafts of the pair of meshing gears are at an angle to each other, ranging between a maximum angle of ninety degrees to a minimum angle of forty-five degrees, and wherein the limits of the angles of the gear teeth range correspondingly between forty-five degrees to a minimum of twenty-two and one-half degrees, the angle of the shafts to each other always being just twice the angle of the meshing gear teeth. The gear teeth of the meshing gears are always in a straight line at their point of contact. There is always an odd number of gear teeth in such gears, and the minimum number of teeth for each gear is always five; rights fit rights and lefts fit lefts, with the shafts at an angle to each other.

Abstract: The principal disadvantage of conformal gearing is its acute sensitivity to center-distance error. An improved type of all-addendum conformal gearing is disclosed in which the concave tooth is much more flexible than the convex tooth, so that if the gears are mounted at too great a center-distance, the tendency of the tooth load to be exerted on the tip of the concave tooth is offset by tooth flexure which shifts the arc center of the concave profile a considerable distance toward the axis of the gear with convex teeth. This increases the pressure angle sufficiently to prevent overloading of the tip of the concave tooth.

Abstract: A W-N gear which has a surface strength at least nearly maximized for a given addendum and minimum pressure angle is realized by selecting a mean radius for the convex and concave circular arcs of the tooth profile in an appropriate range. Also, a dual=line mesh W-N gear of the character described which has a requisite face width minimized is obtained by selecting a mean arc radius which lies in the range referred to above and enables the addendum and dedendum points of meshing contact to appear at equal angle intervals.

Abstract: A sprocket for driving a chain has a pocket between adjacent teeth at least partially defined by an arcuate root surface and oppositely disposed topping surfaces. The root surface, in turn, is defined by a radius centered on the pocket center line having a length at least as great as the sum of the radius of the chain bushings plus one half the backlash of the chain. The topping surfaces lie radially outward from the respective ends of the root surface and are defined by radii centered at points circumferentially spaced from the pocket. The topping surfaces may extend outwardly from the respective ends of the root surface and at the point of merger be tangent therewith.

Abstract: This is a compatible gear system and consists of providing an odd number of teeth on each gear, a minimum of five or more. The size and shape of the gear and its teeth are determined by laying out a regular polygon having an odd number of sides, corresponding to the number of desired gear teeth with the distance from the center of the regular polygon equal to the pitch radius of the desired gear. Then a circle is drawn about each polygon corner with a radius equal to one-fourth of the side of the polygon, this series of circles determining the shape and size of the gear teeth. Next, an intermediate series of circles is provided with their centers at the midpoint of the polygon sides and, of necessity, the intermediate circles are tangent to the teeth determining circles. Lines drawn through the points of tangency between each intermediate circle and the adjacent corner circles are necessarily parallel.

Abstract: A device for preventing reverse transmission of motion in a gear train including a drive and driven gear that are enmeshed together in a train of gears. The drive and driven gears are configured such that the rotative motion is transmitted from the drive gear to the driven gear but not from the driven gear to the drive gear due to a blockage created by the teeth of the drive and driven gear.

Abstract: Involute gearing can be optimized with respect to torque capacity only if the number of pinion teeth is standardized in a fairly narrow range, between about 15 and 40 teeth, depending on the tooth materials, pressure angle and gear ratio. The present invention discloses an alternative system of gearing that standardizes pitch instead of tooth numbers, so that pinions with several hundred teeth can be designed without sacrifice of any torque capacity relative to that of coarse-tooth involute gearing. The use of finer teeth reduces friction, heating and wear, but in particular helps to minimize operating noise.

Abstract: A relatively simple gear-forming process is disclosed, which enables the production of a set of gears that is especially useful for a particular type of gear pump, and which also produces a set of gears which operates with a high degree of rolling contact. The gears are produced by first forming an initial cutter gear having teeth with cylindrical tips supported by narrow supports, and using this initial cutter on a gear shaper to cut a first gear having bullet-shaped teeth. The first gear can then be used as the cutter on a gear shaper to cut other gears with bullet-shaped teeth or to cut gears with pole-shaped teeth. In a gear pump wherein fluid is forced through an axial passage opening into the space between teeth of the sun gear, the sun gear is formed with pole-shaped teeth while the planetary gear is formed with bullet-shaped teeth.

Abstract: A single-flank or double-flank type W-N gear each of the convex or concave tooth flanks of which is formed of a plurality of circular arcs (which participate in meshing engagement and) the centers of which (arcs) are arranged on the pitch line or in the vicinity thereof in spaced-apart relation to each other and an intermediate curved line or lines interconnecting the circular arcs. Meshing contact at any instant is obtained at different locations mutually spaced in the direction of tooth trace and stress concentration at the root of the teeth is minimized.

Abstract: A drive pinion is provided with wide teeth and narrow teeth. A follower wheel is provided with teeth which have cut-away portions at their front sides. When the drive pinion rotates in reverse direction, one wide tooth makes contact with an apex of a tooth of the follower gear wheel thereby preventing the reverse rotation of the drive pinion.

Abstract: A pair of meshing gears, having unique tooth profiles, are provided in a separable gear train which is usable in a self-developing camera to couple a motor in one housing section of the camera to at least one of a pair of pressure-applying rollers mounted on a second camera housing section that is pivotally coupled to the first section for movement between positions blocking and unblocking access to a film container receiving section in the first housing section. The pair of gears have a speed ratio of other than 1:1 and equal tip spacing to facilitate bringing the pair of gears into operative mesh when the second housing section is moved to the operative blocking position.

Abstract: The present invention has for object a mechanism of transmission comprising two toothed wheels meshing with each other.

Abstract: A sprocket designed to drive chains in power transmission systems, which is characterized by a tooth profile having clearance, loading, and topping curves tailored to a selected chain barrel diameter and chain pitch, a selected pressure angle compatible with minimum stress on each engaged tooth of the sprocket, and a continuously curving tooth profile also contributing to the minimizing of stresses.

Abstract: An elliptic gear wheel or rotor having a predetermined pitch circle which includes longer and shorter radius and intermediary portions between said longer and shorter radius portions, the longer and shorter radius portions have teeth of a greater tooth pressure angle than that of teeth on the intermediary portion, and a transmission gear device including at least two identical elliptic rotors of the above type mounted in their respective support shafts in intermeshing relationship to each other.

Abstract: W-N gears of novel basic rack tooth profile designed to have at all times two points of meshing contact located in the same reference plane, one on an addendum arc of first tooth and the other on the dedendum arc of a second tooth neighboring the first tooth on its side opposite to the addendum arc, so that at the respective points of contacts the addendum and dedendum arcs have lines of radius aligned with each other. Such dual tooth contact enables much smoother and quieter gear operation, the points of contact proceeding in the direction of tooth trace.

Abstract: A harmonic drive in which the teeth on either or both of the flexspline and internal spline have a modified involute profile with a small contact angle when fully meshed, and considerable tip relief. The former preferably comprises three discs in line on an input shaft which is cranked to a small eccentricity, the center disc eccentricity being diametrically opposite that of the outside pair. Pressure lubricated plain bearings are advantageously used.

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 drive assembly usable with windshield wipers and the like is disclosed in this application and includes a motor having an output shaft including a helical pinion provided with no more than five teeth. The pinion is in meshing engagement with a helical gear for driving an output shaft connected to a linkage operative to drive a windshield wiper system. The preferred embodiment of the invention disclosed herein includes a pair of bearing assemblies for the motor output shaft, one located adjacent one end of the output shaft and the other located intermediate the ends of the shaft such that a portion of the shaft extends beyond the other bearing assembly. The motor is associated with the output shaft between the bearing assemblies and the helical pinion is located on the extending portion of the shaft.

Abstract: A gear is provided with a trochoidal curved disk comprising a tooth profile modified by rotatably shifting a theoretical trochoidal tooth profile about the center of the gear by a phase angle of .DELTA. .phi. to provide a backlash.

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 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.

Abstract: A new gear design providing increased load-carrying ability while being particularly adaptable to manufacture by lower-cost forming methods with powder metal or plastic materials. The teeth of the gears are unconventional in appearance, having a generally elliptical face outline formed by oppositely curved root and topland lines so that the height of each tooth face is maximum at midpoint and reduces substantially to zero at the length extremeties. The teeth are substantially inclined .Iadd.depthwise .Iaddend.to the pitch .[.line.]. .Iadd.element .Iaddend.and each gear has a large and small end, the tooth slots being invisible when the finished gear is viewed along its axis from the large end. The disclosure includes constructions and calculations for designing conjugate pairs of such unconventionally-shaped gears having preferred running characteristics.

Abstract: A form of gearing with teeth having circular arc profiles and a particular pressure angle which together produce engagement and disengagement in pure rolling. The shearing action tangential to the tooth profiles associated with compressive deformation of the tooth faces is made to exactly offset the shearing action in the opposite direction imposed by the meshing of the teeth.