Abstract: A particularly compact and efficient transmission includes one or more helix-like races having a common axis of rotation, a support member extending along the axis, one or more bearing units axially fixed to the support member and with their peripheries positioned in rolling engagement with the races, and means for rotating the bearing units about the axis whereby the bearing units roll along the races and the support member advances along the axis. Each bearing unit includes a hub, a circular array of roller means located radially outward from the hub, and resilient means for rotatively connecting each roller to the hub so that each roller is stiff in the circumferential directions around the array, but relatively elastic in planes which include said axis hub. When the transmission is under load, the roller means deflect laterally as needed to achieve uniform contact between all roller means and their respective race walls so that the load is distributed uniformly among all of the bearing units.

Abstract: In a lead screw drive, such as that used in a lightweight lathe or milling machine for driving the workpiece relative to the cutting tool, the core of a drive nut is made of a material having a relatively low melting temperature, such as babbitt metal or a relatively rigid thermoplastic material. The low melting point material is contained within a nut housing as of steel. The openings in the nut housing for passage of the lead screw are scaled in a fluid type relation by means of elastic sealing members as of silicone rubber having a melting point above that of the relatively low melting point core portion of the nut. An electrical heating cartridge element is contained within the nut housing in good thermally conductive relation with the low melting point core material.

Abstract: A cylindrical gear train comprising first and second gears having helical eth of different thickness with different pitch diameters for the left hand and right hand sides of the teeth and with different nominal angles of inclination and different mesh correction for the mating left hand and right hand flanks of the teeth. Within the normal module range of m.sub.n =2-6 mm, corresponding to the normal module range of 2.pi.(mm) to 6.pi.(mm), and for pitch diameters up to 500 mm, the maximum tooth convergency is 3.degree. and the addendum modification coefficient does not exceed 0.8.

Abstract: An angle gear for a vehicle steering mechanism includes two bevel gears which can be axially displaced in a housing in order to adjust the rotation backlash of the gear. The axes of the bevel gears form an angle relative to each other and are connected, respectively, to a shaft leading to the steering shaft and a shaft leading to the steering mechanism on the vehicle axle. Axial motion away from the intersection of the shaft axes, which would increase the backlash, is prevented by thrust bearings supported against the housing. Axial motion in the other direction is secured against by means of shackle with spherical cup bearing surfaces that bear against the end faces of the bevel gears, which shackle is adjustable to compensate for the manufacturing tolerances of the bevel gears.

Abstract: A zero clearance, backlash free, adjusting mechanism wherein a multithreaded helical member is constrained against movement within a movable support by means of oppositely disposed concentric threaded members separated by a concentric torsion spring. Opposite ends of the torsion spring are captivated by respective opposite concentric members. One of said members being fixidly, slidably mounted within said movable support. Rotation of the helical member forces the two concentric members apart along the helix forcing the members into a zero clearance position effective to prevent any wobble or yawing movement of the helix and thus eliminating any backlash along the helical member. A U-shaped clip surrounds the movable support so as to retain the assembly effective to prevent accidental dislodgement or movement of the concentric members.

Abstract: A spline drive arrangement has two externally-splined shafts, which engage an internally-splined gear. An extension on the shaft is a relatively close fit in a bush which lines a bore in the shaft. The drive arrangement is maintained full of liquid which can enter and leave a space in the bore by way of restricted passages and a clearance zone between the extension and bush. Damping and viscous drag of the fluid tends to prevent relative movement, between the splines of the shaft and gear, which may occur if the torque load on the shaft is low.

Abstract: A speed reducer comprising a worm gear of the type suitable for driving proportioning pumps. The worm is rotated by an input shaft which is suitably journalled within a speed reducer housing wherein the input shaft bearings are respectively carried within aligned housing openings. Either one of the input shaft bearings is adjustable by means of a threaded hole in the housing where the input shaft is inserted. A threaded adjusting piece is screwed against the race of one of the bearings that hold the input shaft to precisely adjust the longitudinal alignment of the worm relative to the gear and to precisely load the two bearings that hold the input shaft to substantially eliminate excessive wear, vibration and chatter.

Abstract: A precision driving apparatus of the type comprising a pinion and a rack in mesh with the pinion is improved to assure always a good engagement between the pinion and the rack throughout the length of the rack. The rack is formed by monoblock molding of synthetic resin material so as to comprise, as the integral parts thereof, a tooth part, a base part, a connection part and a distance limitation part. The connection part elastically connects the tooth part and base part at both ends thereof in such manner that the tooth part may be displaced only in the direction normal to the direction in which the rack is moved, without any deformation of the tooth part itself.

Abstract: A technique for correcting backlash in gears utilized in printing machines. The backlash is corrected by means of toothed segments, i.e. sections of a gear, with each segment having gear teeth of varying width, with the teeth at the center of the segment having greatest width and the width of successive teeth decreasing by 0.005 to 0.6 mm to minimum values at both ends of the segment. Each segment is positioned so that the gear teeth of proper diameter to reduce backlash are disposed next to the teeth of the gear on which the segment is mounted.

Abstract: A mechanism for damping vibration in the gear drive of a rotary printing press is disclosed. The various gear driven elements such as transfer cylinders, forme cylinders and blanket cylinders carry belt pulleys with the pulleys being connected by suitable belts. The sizes of the pulleys are selected and sized to attempt to drive the various cylinders at a speed less than the speed provided by the gear drive. In this way the gear drive is not allowed to chatter or vibrate. The orientation of the drive belts is selected to conform with the number of gears in a particular gear drive assembly.

Abstract: A cone drive, high output speed reducer, having a low clearance for low profile applications. An input shaft drives a helical idler pinion which in turn drives two other helical idler pinions. The two other idler pinions are each mounted on a separate shaft carrying a cone drive worm. The two worm shafts turn in unison, and the worms are each meshed with a separate worm gear. The two worm gears are operatively mounted on an output shaft. One of the helical idler pinions is provided with an adjustment means for equalizing the load sharing. That is, to provide equal loads on each of the helical pinions for load sharing throughout the twin drive gearing units of the speed reducer. The speed reducer may be provided with either an air cooling system or a water cooling system.

Abstract: Means for adjusting automatically for backlash caused by wear between the teeth of a steering nut gear rack on a steering shaft worm and the teeth of a steering mechanism gear sector which engages the rack teeth. The invention utilizes a resiliently biased, e.g., spring pressed pin carried either by the steering nut member or the gear sector member and pressing against a tooth of the other to maintain a constant torque bias of the steering nut maintaining it to a rotated position on the steering shaft. Thus, the teeth of the two members will always effect engagement with no backlash when such members are positioned with respect to each other for straight-ahead steering. When steering is initiated the response is immediate and there is no play due to looseness between steering nut rack and gear sector teeth.

Abstract: The articulated mountings for vehicle seats includes two hinged parts, one part being formed with a spur gear and the other part with a geared rim of larger diameter and engaging the teeth of the spur gear. The gear rim is mounted for rotation on a pivot axle. The axle supports for joint rotation an eccentric disk which in turn supports for rotation the spur gear. To eliminate backlash in the bearing surfaces and in the meshing teeth of the gears, the eccentric disk is coupled to the pivot axle on a non-circular coupling section which engages two opposite sides of the eccentric recess in the eccentric disk but permits radial displacement of the latter. A setting mechanism preferably in the form of a resilient cushion or in the form of a biasing spring keeps the eccentric disk in its eccentric position.

Abstract: An anti-backlash nut is disclosed of the type which undergoes translational movement along a screw in response to relative rotational movement between the nut and screw. This anti-backlash nut has oppositely-directed longitudinal flexure members radially biased towards the screw to provide equal drag torque and minimum relative deflection for travel of the nut in either direction.

Abstract: Apparatus is described for adjusting backlash clearances between the flutes of two meshing corrugating rolls, while the rolls are rotating, permitting minimization of noise levels. The corrugating rolls are driven through a pair of meshing helical gears, one of which is free to move axially on its drive shaft. A mechanism moves the helical gear axially, resulting in a slight rotation of the corrugating roll drive shaft, relative to the other corrugating roll. The preferred mechanism is mounted about the drive shaft of the movable helical gear. A hand wheel adjuster is threaded onto a sleeve fixed to a frame or other support and contacts the rotating helical gear through a bearing mounted on a second sleeve fixed to the gear. Rotation of the hand wheel adjuster causes the adjusting axial movement of the helical gear system.

Abstract: An improved tuning apparatus with manual and pushbutton tuning with compact low profile design. For pushbutton tuning operation gear segment members loaded with a spring bias are arranged for engagement with each of the pushbutton devices to eliminate any lost motion being imparted to the core slide bar. Motion imparted to the slide bar actuates the cores and associated coils to change frequency. A declutching mechanism is used when using the pushbutton operation to remove the core slide bar from engagement with a manual drive input.

Abstract: An adjustable gear train is disclosed wherein play in a train of intermeshing bevel gears is accommodated by forming one of the gears of two radially separated coaxial parts which are axially movable with respect to one another, one of the parts being gear toothed and the other of the parts forming a shaft for the toothed part.

Abstract: A worm and worm-rack combination with hydrostatic lubrication therebetween. The teeth of the worm and the worm-rack have a trapezoidal cross-section and lubricating oil is supplied through openings in the toothed flanks. The half angle formed between each of the toothed flanks and the line of action to the axis of the worm is limited solely to the range of 6 to 10 degrees and the lead angle is in the range of 2 to 10 degrees.

Abstract: A precision gear reduction assembly for a gear train assembly for a gear train incorporates a backlash control in which the intermediate gear shaft has one end only mounted within an eccentric bushing. The bushing provides for the adjustment of the intermeshing of the final two gears of the gear train by tilting the intermediate shaft slightly as the bushing is rotated to achieve the desired degree of backlash control.

Abstract: Mechanism which compensates for backlash error in a lead screw position indicator by decoupling the indicator shaft from the lead screw when reversing rotation. The position indicator then displays correct information regardless of the direction of rotation of the lead screw.

Abstract: An anti-backlash nut assembly is disclosed of the type which undergoes translational movement along a screw in response to relative rotational movement between the nut and screw. The assembly includes a nut which is axially-split into first and second portions, both of which have an internal thread complementary to the external thread of the screw. The two portions of the axially-split nut are retained in the radial direction by a spacer, and a spring is used to apply biasing in the longitudinal direction to minimize backlash.

Abstract: A worm gear drive and ratchet system in which a flexible, two-piece, toothed drive wheel is driven by a threaded drive shaft. The two-piece, toothed drive wheel comprises identical halves that are keyed and bonded into a fixed relationship. Upon reaching a stop, gear teeth embossed on the flexible drive wheel ratchet over the threads on the threaded drive shaft.

Abstract: A drive assembly and method of forming the same wherein indexed and coworking gears are provided having improved accurate meshed engagement. The drive assembly includes a first conjugate pair of indexed coworking gears and a second conjugate pair of indexed coworking gears adapted to have meshing engagement with the first pair. The first pair defines an assembly wherein the gears are fixedly coaxially secured and the second pair defines an assembly wherein the gears are initially loosely secured with one of the gears being disposed in meshed relationship to one of the gears of the first assembly. The second gear assembly is then moved relative to the first gear assembly so as to cause the other gear thereof to find accurate meshed association with the other gear of the first assembly whereupon the gears of the second assembly are firmly secured to have maintained accurate meshed association with both gears of the first gear assembly.

Abstract: A digital clock having backlash-free gearing between a step motor and digit wheels that indicate time. The gearing includes an input pinion connected to the step motor, intermediate gearing driven by the pinion and an output ring gear driven by the intermediate gearing and connected to drive a seconds digit wheel of the clock mechanism. A pivotal bracket rotatably carries the intermediate gearing and is biased in one direction by a spring so that the intermediate gearing is urged into backlash-free engagement with both the input pinion and the output ring gear. The bracket tilts as well as pivots to permit the intermediate gearing to properly mesh with both the input pinion and the output ring gear.

Abstract: A drive mechanism for a spindle of a tool machine, in particular a tool machine having a hob rotatably mounted thereon. Worm gearing is provided for driving the workpiece relative to the hob. Clearance is normally provided between the teeth on the worm and the teeth on the worm gear. Structure is provided for eliminating the clearance so that the drive of the workpiece is a positive drive and no errors exist due to the clearance normally provided between the teeth on the gear and the worm gear. In the particular embodiment disclosed in this application, a second worm is provided and is driven by the first-mentioned worm and worm gearing. The helix angle on the second worm lies outside of the automatic locking area and, in turn, acts onto a braking mechanism.

Abstract: Centerline of the pinion and gear is offset from the centerline of the bore in which the pinion bearing housing is contained. A change holds the bearing housing in operating position and is also operable to rotatably adjust the pinion housing, the O.D. of which is eccentric relative to its I.D. Thus rotation of the bearing housing within the bore effects the adjustment of the vertical height of the pinion relative to the driving gear.

Abstract: An anti-backlash gear assembly including an hydraulic piston that automatically maintains clearance-filling positioning of two relatively circumferentially adjustable axial parts of a split gear by receipt of hydraulic fluid from a local accumulator via a fluid-retaining check valve means.

Abstract: A drive follower assembly for a disc recorder of the type including a frame supporting a lead screw and a guide rod positioned in vertically spaced, parallel relation to the load screw is disclosed. The drive follower includes a one-piece carriage defining a longitudinal bore. A first, hollow, cylindrical, internally threaded follower is disposed within the bore and held against rotation and longitudinal movement relative to the body. A second, internally threaded adjustment member is loosely held within the bore and engaged by the lead screw. A coil spring is positioned between the follower member and the adjustment member to provide a snug fit on the lead screw and prevent decoupling. Provision is made for holding the adjustment member against rotation relative to the body yet permitting relative rotation for adjusting the initial preload of the spring.

Abstract: An anti-backlash means, particularly adapted for photographic enlargers including a channel shaped optical bench having a pair of guideways; a frame movable along the guideways, having a pair of tracks, a pair of rack elements, and leaf springs supporting the rack elements in continuous relation; a gear rotatably supported by the optical bench including a pair of gear elements engageable with the rack elements, and wheels riding on the tracks to maintain a fixed minor spacing between the pitch plane of the rack elements at the pitch radius of the gear elements; either the gear elements or the rack elements having offset teeth to eliminate backlash.

Abstract: An improved mechanism is provided for biasing a driven gear in a gear train of the variable center distance type in which the driven gear is meshed with a drive gear and rotates about an axis which is not fixed, at least radially, relative to the axis of the drive gear. The biasing mechanism includes spring means engaged with the driven gear for biasing the same substantially radially toward the driven gear into mesh therewith at a force which provides appropriate relatively low-level engagement forces between the meshed gear teeth. A stop is provided for limiting deflection of the spring means in a direction corresponding to unmeshing of the drive and driven gears. The stop is positioned to limit such deflection of the spring means to an amount less than the deflection required for unmeshing of the gears.

Abstract: Adjusting, locking, and pre-loading means for a bevel gear or the like exerting axial thrust on the shaft which the gear is made fast to. The adjusting means is a large nut which is rotatable in its mating threads to move a mount for the gear shaft so as to locate the position of the gear's plane of rotation. The locking means is that portion of a locking and pre-loading bolt which bolts the nut to the non-rotatable mount to set the located position of the plane of rotation. The pre-loading means is that portion of the same bolt which exerts an opposite force on the nut and on its mating threads, stressing the two in opposite ways so as to pre-load the threads in the same direction in which the gear thrust is exerted, enabling the axial thrust of the gear to be additive to the pre-load rather than tending to unload the pre-load, thus permanently fixing the set location of the plane of rotation of the gear with no free play.

Abstract: An anti-backlash gear system for use between a drive shaft and a driven shaft and wherein one said shaft is provided with a gear having helical teeth thereon, said anti-backlash system comprising a gear portion fixed to the other said shaft, and meshing with said helical gear, said gear portion having a width less than the width of said helical gear, a movable gear portion, slidably mounted on said shaft, and being slidable therealong towards and away from said fixed gear portion, said movable gear portion having a width less than that of said helical gear, and having helical teeth meshing therewith, spring means engaging said movable gear portion, and urging the same normally away from said fixed gear portion, and adjustable means for moving said movable gear portion towards said fixed gear portion, against the pressure of said spring.

Abstract: Disclosed herein is a V-belt power transmission including a movable sheave member which has a hub and is mounted on the driving portion of an input shaft for common rotary movement and for relative axial movement via first and second axially spaced drive bushings, each having a central aperture which receives the shaft driving portion and having driven surfaces which are drivingly engaged by driving surfaces on the shaft driving portion during rotation of the shaft by a power source. The first drive bushing is affixed to the hub of the movable sheave member and the second drive bushing is connected, either to the hub of the movable sheave member or to the first drive bushing, by means arranged to resiliently urge the second bushing rotationally relative to the first drive bushing so that the driven surfaces of the drive bushings apply a predetermined "locked-up" torque on the shaft driving portion, thereby minimizing backlash between the movable sheave member and the shaft driving portion.

Abstract: An impact absorbing device for protecting a rotatable member of a motor powered machine tool feed mechanism from excessive impact and overload is disclosed. The device includes structure forming a flanged piston concentrically mounted with respect to the rotatable member and axially slidable within a housing in response to axial displacement of the rotatable member, (which is undesirable and thrust and radial bearing structure in which the rotatable member is journaled for rotative displacement. The housing and the flanged piston combine to define a pressure chamber whose volume varies as a function of the axial position of the piston. The pressure chamber is connected to a source of fluid under pressure, to cause the piston to yieldingly resist axial displacement of the rotatable member with respect to the housing.

Abstract: A load handling device is disclosed having an improved swing drive assembly including a hydraulically driven pivotally mounted swing drive pinion biased against a segmented ring gear by a hydraulic actuator with a guide roller adjacent the pinion engaging a guide flange concentric with the ring gear to limit the maximum tooth engagement between the pinion and ring gear and thereby provide essentially constant backlash on the pinion gear regardless of eccentricities or other irregularities in the ring gear during swing drive operation. When the swing drive pump is shut down a bypass valve is automatically actuated shunting the flow of hydraulic fluid around the pump and a spring operates to counteract the separating force between the pinion and ring gear due to wind induced rotating force which produces torque on the pinion as a result of the back pressure in the motor and the shunted supply-return lines.

Abstract: A numerically controlled reversible gear system with a main output gear using two driving gears with a same number of teeth each coupled to respective one of a pair of pulse motors with same specifications connected to a single controlling equipment, wherein the driving gears are meshed with said main gear after rotationally shifting them in opposite direction by a same number of teeth within a range of attraction of respective phase of the pulse motors and either one gear acts as a driving element depending upon the direction of rotation so as to eliminate backlash of the main gear.

Abstract: The cutting mechanism comprises a driving shaft and a driven shaft. A motor is connected to the driving shaft and rotates the driving shaft in a first direction. A gearing arrangement interconnects the driving and the driven shafts so that rotation of the driving shaft causes concomitant rotation of the driven shaft in a direction opposite to the first direction. Coacting cutting means are provided on the driving and the driven shafts for cutting material received therebetween. A motor is connected to the driven shaft and rotates the driven shaft in a direction opposite to the normal direction of rotation of the driven shaft to eliminate backlash between the coacting gears. Thus, the clearance between the cutting edges of the rotary cutting means is always constant and uniform.

Abstract: A flexible, cantilevered, gear wheel support, comprising a flexible pin mounted at one end in a rotating carrier and carrying at the other end a gear wheel the axis of which, when the pin flexes, remains parallel to the position of this axis in the pin unflexed condition; the pin between its mounting on the carrier and its part that carries the gear wheel presenting a greater resistance to bending in planes radial of the rotational path of the carrier than it presents to bending in planes tangential to this path.

Abstract: This invention relates to a slack adjustment and take-up device for kinemc couplings of the rack and pinion type, particularly for the steering box of motor vehicles, in which a rotatably supported pinion engages with a rack guided in a translatory manner in the box. The main feature of this invention consists in that a threaded member is screwed into the box to thrust the rack on to the pinion, said threaded member being provided with circumferential markings which form a vernier system with corresponding markings on the box.

Abstract: An anti-backlash, self-aligning nut construction comprising specially constructed tubular nut bodies coacting with concentric spring sleeves of unique configuration to effect precise, self-aligning, anti-backlash assemblages. The nut bodies in general each have a pair of spring-biased elements provided with internal thread formations adapted for engagement with the external threads of a screw. In one embodiment of the invention a self-aligning spring sleeve is provided having solely three pairs of oppositely-disposed transverse slots to obtain the desired aligning feature. The nut body has a base portion which is separated from the spring-biased elements by means of two transverse slots which, together with an adjacent pair of slots in the spring sleeve, form in effect a universal joint. One of the remaining slot pairs in the sleeve is oriented circumferentially with respect to the first pair by an angle of 90.degree., with the third pair of slots being circumferentially aligned with the first pair.

Abstract: The invention overcomes undesirable backlash effects in gear generators which cut gears by climb milling (i.e., with cutter blades rotating in the same direction as the work), these undesirable backlash effects being initiated by the intermittent cutting torques that tend to move the work momentarily ahead of the generating drive train as each blade is in the cut. Instead of a conventional spindle brake to oppose the cutting torques, an auxiliary motor in proximity to the work spindle end of the generating train applies torque to the train in the same direction as it is being driven by the main drive motor, and in the same direction as the cutting torques, thereby maintaining tightness in that portion of generating train which controls work spindle rotation by keeping the train gears with their "coasting" sides in contact rather than trying to keep their "driving" sides in contact.

Abstract: A single shaft gas turbine engine of the type having a shaft assembly including, in axial alignment, a radial turbine element, a central slinger ring element, a radial compressor element, and a geared power takeoff element. The elements of the shaft assembly are interconnected by a tie bolt. An annular combustor liner defines a combustion chamber that encircles the central slinger ring. The shaft assembly is journaled by two bearings which are respectively located outboard of the turbine and on the geared power takeoff element. Each bearing is carried by a tubular support. Each tubular support has a free end carrying the respective bearing and another end secured to the bearing. The ends are spaced and interconnected by circumferentially spaced ribs to provide a flexible support for the prospective bearing. The gear on the power takeoff element drives a larger gear to withdraw power from the engine.

Abstract: In a pushbutton type tuner assembly for a radio receiver the treadle bar drive gear, which is coupled to the manual tuning knob through the crown gear and the clutch mechanism, is biased into meshed relation with the treadle bar gear through a pair of lever arms mounted for pivotable movement about fixed pins, and a pair of springs. With the end of the treadle bar gear shaft supported in an aperture in the side wall of the tuner, the first lever arm applies a moment to the treadle bar shaft through the bias of a spring secured to the front wall of the tuner, thereby holding that shaft tightly against the supporting aperture wall. The second lever arm applies a moment to the pinion gear shaft through the bias of the second spring which couples the two lever arms together and adds to the moment of the first spring. The two moments provide balanced radial forces on the gears which eliminate backlash and maintain the two gears in a properly meshed relation.

Abstract: A load handling device is disclosed having an improved swing drive assembly including a pivotally mounted swing drive pinion biased against a segmented ring gear by an actuator with a guide roller adjacent the pinion engaging a guide flange concentric with the ring gear to limit the maximum tooth engagement between the pinion and ring gear and thereby provide essentially constant backlash on the pinion gear regardless of eccentricities or other irregularities in the ring gear.

Abstract: A system for the elimination of consequences of angular clearances in driving gears, especially in machine tool driving gears consisting of a dynamic electromagnetically operated brake and of a power unit for exciting said brake. The brake has a rotor coupled without play with a spindle and constituted by the rotor of an asynchronous motor. The brake also has an exciter with double push-pull windings connected with a power unit. The power unit consists of a hand-adjusted direction current source supplying the main excitation winding, and a section generating a current which supplies the other excitation winding. The current supplying the additional excitation winding 10 is proportional to the current absorbed by the driving motor and to the current supplying the main excitation winding.

Abstract: Dial gauge for measuring length in two different units, characterized in that a first gear and a second gear are mounted to rotate with a pinion which meshes with a spindle rack; a center pinion fixed to a first pointer meshes with said first gear; a pinion fixed to a second pointer meshes with said second gear; and the gear ratio between said center pinion fitted with the first pointer and said first gear is different from the gear ratio between said pinion fitted with the second pointer and said second gear.

Abstract: A torque transmitting devices has an input shaft having two axially-spaced sets of external splines. Two internally splined members are threadedly interengaged and respectively engage the spline sets on the shaft. The angular positions of the members are adjusted by spacers so that the portion of the shaft between its spline sets is in torsion, the direction of the torsion being such as to increase the threaded engagement between the members.