Abstract: A counter gear mechanism having a large gear coaxially engaged to a small gear. The large gear comprises a disk-like portion and a circumferentially extending portion continuously extending on a peripheral portion of the disk-like portion. The circumferentially extending portion has a circumferential outer surface on which first gear teeth are provided. The small gear comprises a disk-like plate and a body being cylindrically shaped to have a circumferential outer surface on which second gear teeth are provided. A tubular member, provided at a center of the disk-like portion, defines a hole and extends along a rotational axis around which the large gear rotates. At least one recessed portion, formed in the disk-like portion, extends in a circumferential direction relative to the rotational axis. At least one projection is fixed to the disk-like plate of the small gear on an opposite side to the side on which the body is provided.

Abstract: The invention relates to a torque-splitting gear having a driving shaft and axis-parallel driven pinion shafts running in the same sense which are coupled with each other by toothed wheels. The gear is to be designed in such a way that it can be built up in different dimensions and for different powers while maintaining a great number of its components without change. The coupling between the driving shaft and the main driving toothed wheels is realized by a herringbone gearing. For transmitting great torques the main driving toothed wheels and the pinions on the driven pinion shafts are additionally coupled with each other via intermediate pinions and hollow wheels.

Abstract: The present invention relates to a double-acting type dynamic back clearance relief driving system having two sets of worm shafts coupled with a worm gear, one worm shaft set acting as a prime mover worm shaft and the other acting as a displacement control worm shaft. When the system is driving, one of the worm shaft sets is applied with faster rotary driving motion and always applies forces on the worm gear set. Another worm shaft set is a displacement control worm shaft coupled also with the worm gear set, or an individual worm gear set of the same pitch or different pitch to be locked upon the same shaft. The acting force to be applied constantly on the gear by the force applying worm shaft always causes the displacement control worm shaft to stress the worm gear reversely, and since the worm shaft is irreversibly driven, there is no clearance between the worm gear and the two worm shafts.

Abstract: Gear wheel play between cooperating gears of two cylinders whose axial spacing can be varied, in a rotary printing press can be eliminated by use of a free wheeling gear supported on the journal of the first of the two cylinders and engaging the gear wheel on the second cylinder. A circumferential shifting of the free wheeling gear will eliminate gear wheel play. A phase adjusting gear assembly is used to accomplish the circumferential phase shifting of this gear.

Abstract: A gear mechanism in which the backlash between bevel gears can be easily adjusted is provided. The gear mechanism has first and second bevel gears which engage with each other; a supporting member, including first and second threaded portions, for the first and second bevel gears, and first and second bearings for rotatably supporting the first and second bevel gears on the supporting member. The first and second bearing include cylindrical members with threaded portions for engagement with the first and second threaded portions of the supporting member.

Abstract: An anti-backlash nut, movable along a rotatable screw. The nut has internal threads complementary to the threads in the screw. The nut has two nut halves movable as a unit and also rotatable relative to each other on the screw. Means are connected to the nut halves to induce their relative rotation on the screw in opposite directions and there are elastomeric friction means between the two halves to limit their relative rotational movement.

Abstract: A gear-driven docking apparatus for removable mass-storage drives comprises a guide rail, mounted inside a computer chassis, and a drive carrier, bearing a mass-storage drive. The drive carrier includes an alignment groove for slidingly receiving the guide rail and a gear train for engaging a rack profile formed at the proximal end of the guide rail, The rack profile and the gear train incorporate a mechanism that provides gear-and-rack synchronization under all operating conditions. Data and power connectors of the mass-storage drive are terminated to a printed circuit board that is movably attached to the drive carrier. The circuit board merges the separate power and data connectors into a single docking connector having registration pins.

Abstract: Adjustment capabilities are useful in gearing mechanisms so that backlash settings between gears may be changed to accommodate for normal operation, wear, or maintenance disturbances. The subject backlash adjustment mechanism allows for adjustment of center distances between an adjustable idler gear (23) and a camshaft gear (24), while providing a geometric alignment (47,82) relationship to maintain a substantially fixed center distance between the adjustable idler gear (23) and another mating gear (22). The subject backlash adjustment mechanism (26) has the adjustable idler gear (23) rotatably mounted on an idler gear mounting (31,58) having a slotted hole (33,62), with the idler gear mounting (31,58) being releasably connected to a cylinder block (11).

Abstract: The present invention relates to an apparatus for preventing circumferential separation between the meshing teeth of a first gear and a second gear of a gear train. Exemplary embodiments of the invention include a first torque transmitting gear coaxially fixed to the first gear, a second torque transmitting gear in meshing engagement with the first torque transmitting gear, a third torque transmitting gear in meshing engagement with the second torque transmitting gear, and being rotatable about a shaft fixedly connected to a fourth torque transmitting gear which in turn is in meshing engagement with the second gear. The third torque transmitting gear is drivingly connected to the shaft via a pre-loaded resilient element formed by a first torsion spring and a second torsion spring. In an exemplary embodiment, the torsion springs are arranged such that windings of the first torsion spring are located within spaces formed between adjacent windings of the second torsion spring.

Abstract: A planetary gear drive assembly for a rotary sprinkler includes a drive housing in which a planetary gear train is enclosed. A turbine located beneath one end of the drive housing rotates the gear train through a turbine shaft that extends into the drive housing. An output shaft extends out of the other end of the drive housing for rotating the nozzle assembly of the rotary sprinkler. The drive assembly includes an alignment means for causing the planetary gears in each stage of the gear train to self align the planetary gears relative to an internal ring gear on the drive housing as each stage is slid into the drive housing during assembly. The alignment means comprises a stepped extension on a forward edge of the ring gear that extends around only a portion of the circumference of the ring gear.

Abstract: In a cross-cutter, particularly for small paper formats, having two knife shafts driven in synchronized opposing manner, provided with two knife sets, which are so mutually staggered on the two knife shafts that in a specific rotation position association of the two knife shafts only one of the sets engages, whereas the other knives pass through the cutting gap without cooperating with a corresponding counterknife. It is therefore possible for one knife shaft set to implement several synchronous lengths of cut by merely changing the reciprocal rotation position association of the knife shafts with respect to one another.There is further provided a system for setting the backlash of the synchronizing gear to a minimum at several positions of a gear circumference by hydraulicly widening pockets in the gear body.

Abstract: A control member of a torque transmitting apparatus is composed of pins, a retainer, a first and a second arc-shaped gears which form a single ring gear together, a piston, first springs and second springs. The first and second arc-shaped gears are biased respectively by the first and second springs in opposite directions so that the splines of the first and the second gears are deviated from each other while they are in mesh with corresponding splines of a sprocket sleeve and a cam sleeve. As a result, rattling noise due to backlash of the splines is suppressed even when torque change is transmitted to the sprocket sleeve.

Abstract: A no back-lash gearing mechanism comprises meshing toothed elements. At least one of the toothed elements has a number of teeth having an undulated, "S"-shaped, transverse section. The teeth are arranged such that, when the toothed elements mesh, one of the teeth having the undulated form makes at least one point of contact with each of two opposing adjacent teeth of the other element thus preventing back-lash.

Abstract: A high precision linear actuator with low hysteresis has an elongate linearly movable drive shaft for controlling a damper. The drive shaft is connected to a drive pad mounting a rack gear. A motor drive is adapted to receive an input signal in the form of an input voltage and converts the voltage into rotation of a motor drive shaft. A drive means is operatively associated with the motor drive shaft output and is in cooperating contacting relation with the rack gear for linearly translating the drive shaft. A position sensor outputs a signal indicating the linear displacement of the drive shaft.

Abstract: A guide device for the backlash-free alignment of mutually relatively displaceable parts of an optical instrument, preferably of a rack-and-pinion housing of a microscope on a profile column. The rack-and-pinion housing is constructed with a gearing such that it can be moved along the profile column. Arranged between the rack-and-pinion housing and the profile column are a plurality of sliding elements (8), which are firstly constructed resiliently and form a force-closed connection between the rack-and-pinion housing and the profile column. For the purpose of fixing in the rack-and-pinion housing, the sliding elements (8) have a receptacle (11) for inserting an adhesive. After curing the adhesive, the sliding elements (8) lose their spring action.

Abstract: A table-turning driving apparatus comprises a pair of first and second worm shafts 16 and 17 which engage a driving shaft through gears and which is rotated in the same direction of rotation as that of the driving shaft. One 16 of the worm shafts is fixed, at the end thereof directed to the driving shaft, to a gear 28 by means of a fastening and connecting member 29, 30 so that the phase thereof is adjustable relative to the gear 28, and pinions 34, 40 integral with worm wheels 33, 39 which engage worms 32, 38 of the above-mentioned worm shafts 16, 17 are connected to a ring gear 65 of the table.

Abstract: The object of the present invention is to provide a speed changer having a simple structure and great speed changing ratio. In the speed changer of the present invention, a movable gear section has a first pinion gear and a second pinion gear, which are coaxially integrated and which are capable of spinning about their common axis. A motor moves the movable gear section on a circular orbit. A fixed ring gear fixedly encompasses the circular orbit, the fixed ring gear has a first inner gear section, which is formed on an inner circumferential face, wherein the first pinion gear is capable of engaging with the first inner gear section and rolling thereon. An output ring gear rotatably encompasses the circular orbit, the output ring gear is coaxial to the fixed ring gear, the output ring gear has a second inner gear section, which is formed on an inner circumferential face, wherein the second pinion gear is capable of engaging with the second inner gear section and rolling thereon.

Abstract: A gear mechanism comprises a housing, an input gear of helical gear supported by the housing for rotation in first and second rotational directions and adapted to be connected to a rotational power source, an output gear of a helical gear supported by the housing for rotation, a first gear train for transmitting the rotational power from the input gear to the output gear when the input gear rotates in the first rotational direction, a second gear train for transmitting the rotational power from the input gear to the output gear when the input gear rotates in the second rotational direction.

Abstract: A device for mechanically limiting the travel of a moving object along a path parallel to a travel rack bar. The ends of the travel rack bar include narrow extensions that come within a pair of elongated members of a moving rack member that are kept at a cooperative spaced apart relationship with respect to each other. The travel is accomplished through a pinion gear that is meshed with the travel rack and when it reaches the end of the narrow extension it pulls in the spring loaded moving members thereby maintaining the meshed engagement of the pinion gear at all times with either the rack member extension or the moving member.

Abstract: A drive for turning a pinion shaft provided with toothed ridges by means of a rack the latter is connected on both sides with pistons, which in each case are held by a cylinder with the formation of a working space which may be acted upon by a pressure medium and closed by a cover or piston. In this case, the rack may be mounted for relative movement with respect to a toothed piston. The rack as well as the toothed piston engage with their teeth the toothed ridges of the pinion shaft.

Abstract: A device is proposed which enables a cam controlling an internal combustion engine valve to be moved relative to its driving shaft. A drive member is rotatable with a driving shaft, and a cam for co-axial rotation relative to the driving shaft. An intermediate member is mounted in a support for rotation so as to rotate eccentrically with respect to an axis of the driving shaft. The support is held for movement within a plane perpendicular to the shaft axis. A control rod is drivingly associated with the support and driven by an actuator.

Abstract: The object of the present invention is to provide a compact drive system, which is capable of highly synchronizing the parallel movement of travellers. In the drive system of the present invention, a pair of racks are arranged parallel in a first direction. A pair of travellers are capable of moving in the first direction. A first shaft is arranged in a second direction and rotatably connected to the travellers. A second shaft is arranged in the second direction and rotatably connected to the travellers. A pair of first pinion gears are fixed to the first shaft and respectively engaged with each rack. A pair of second pinion gears are fixed to the second shaft and respectively engaged with each rack. Driving means moves the travellers in the first direction. The first pinion gears are engaged with the racks with torsion, which has been applied to the first shaft in a first circumferential direction. The second pinion gears are engaged with the racks with torsion in a second circumferential direction.

Abstract: Adjustment capabilities are useful in gearing mechanisms so that backlash settings between gears may be changed to accommodate for normal operation, wear, or maintenance disturbances. The subject backlash adjustment mechanism allows for adjustment of center distances between an adjustable idler gear (23) and a camshaft gear (24), while providing a geometric alignment (47,82) relationship to maintain a substantially fixed center distance between the adjustable idler gear (23) and another mating gear (22). The subject backlash adjustment mechanism (26) has the adjustable idler gear (23) rotatably mounted on an idler gear mounting (31,58) having a slotted hole (33,62), with the idler gear mounting (31,58) being releasably connected to a cylinder block (11).

Abstract: Motor vehicle gearbox with an input shaft (2), two countershafts (3,4) and an output shaft (5). On the first countershaft (4) there is a rotatable gear (30) which cooperates with brake elements through which a frictional torque is transmitted via a gear (10) on the output shaft to the second countershaft (3) and from the second countershaft to the output shaft (5) and back to the first countershaft (4).

Abstract: A drive transmission mechanism for a biaxial extruder includes first and second output gears respectively fitted with an axial displacement on first and second output shafts which are connected to first and second screws of a biaxial extruder. A first lower gear and a first upper gear are arranged below and above the first output gear. A second lower gear and a second upper gear arranged below and above the second output gear. A reduction gear train is provided for quartering the drive force of a common drive source equally and distributing the quartered drive force to the first lower gear, the first upper gear, the second lower gear and the second upper gear.

Abstract: A gear arrangement for interconnecting a pair of gear wheels which are carried on rotary shafts the rotary axes of which intersect, comprise a toothed rack having two rows of teeth for engagement with the wheels respectively. The rack is resiliently biased into engagement with the gear wheels.

Abstract: The present invention relates to a double-acting type dynamic back clearance relief driving system having two sets of worm shafts coupled with a worm gear, one worm shaft set acting as a prime mover worm shaft and the other acting as a displacement control worm shaft. When the system is driving, one of the worm shaft sets is applied with faster rotary driving motion and always applies forces on the worm gear set. Another worm shaft set is a displacement control worm shaft coupled also with the worm gear set, or an individual worm gear set of the same pitch or different pitch to be locked upon the same shaft. The acting force to be applied constantly on the gear by the force applying worm shaft always causes the displacement control worm shaft to stress the worm gear reversely, and since the worm shaft is irreversibly driven, there is no clearance between the worm gear and the two worm shafts.

Abstract: The driving apparatus for the spindle of an electro erosive machining apparatus comprises an electric motor adapted to be operated to rotate in two opposite directions and a reduction gear box assembly operatively coupled to the electric motor. The gear assembly is provided with a pinion and two gear wheels which are rotatable with reference to each other. Both gear wheels mesh with the pinion. One of the gear wheels is under the influence of a torsional biasing force. A first of the gear wheels is torsionally fixedly connected to the spindle of the electro erosive machining apparatus, while the second gear wheel is rotatable with reference to the spindle. Such a driving apparatus operates with low expenditure without backlash in both senses of rotation whereby an eventually occurring wear is automatically compensated.

Abstract: A backlash control system for a printer medium drive system having a motor-driven gear train for driving medium-engaging rollers. Pinion gears mounted on the motor drive shaft mesh with a main gear and a tension gear, mounted in turn on a main drive and a tension roller. An anti-backlash spring device includes pinch fingers which exert a pinch force on the main and tension gears. The pinch fingers are mounted at ends of a horizontal spring beam secured at an intermediate pivot point. As the motor turns to drive the print medium forward, the pinch force results in bowing of the horizontal beam, tending to exert a restoring force on the main and tension gears. As the motor direction is reversed and stopped, the restoring force results in the main and tension gears being pulled backwards to keep the gear teeth meshed tightly to the pinion gear teeth. The pinch fingers also exert a thrust load axially against the main drive and tension gears.

Abstract: Planetary reduction gear comprising at least one stage consisting of an input plant pinion (7), of spider gears (8, 9, 10) mounted on a spider (11) secured to an output shaft and to a fixed crown wheel (12). The spider gears are mounted so that they can float radially in the spider and the toothings of the meshing elements are offset such that the radial resultant of the forces exerted, on the one hand, between the crown wheel and the spider gears and, on the other hand, between the spider gears and the planet pinion points either toward the planet pinion in order to reduce the noise of the reduction gear, or toward the weakest elements in order to increase the load capability of the reduction gear.

Abstract: A non-backlash toothed wheel mechanism comprises, an internal gear, and an external gear mating with the internal gear wherein at least one of the internal gear and the external gear has a circumferentially arranged gear teeth array and at least two gear parts each of which has gear teeth forming a part of the circumferentially arranged gear teeth array, a positional relation between the gear parts is changeable, and the mechanism further comprises elastic means for urging one of the two gear parts relatively to another one of the two gear parts to change the positional relation between the gear parts so that each of the gear parts mates with another one of the internal gear and the external gear to reduce a backlash between the one of the internal gear and the external gear and the another one thereof.

Abstract: A planetary gear system has a driven sun gear, an internal gear fixed on a case concentrically with the sun gear, a rotatable shaft concentric with the sun gear having a carrier, and planetary gears on the carrier for engagement with the sun gear and the internal gear. The internal gear is divided in the axial direction into first and second internal gear sections which are adjustable in their relative angle in the circumferential direction so as to reduce a backlash in the engagement with the planetary gears. The planetary gears comprise a large planetary gear part for engagement with the sun gear and a small planetary gear part concentric with the large planetary gear part for engagement with the internal gear.

Abstract: A gear assembly reduces gear wear by insuring that the backlash of a pair of gears is at a desired setting. A first gear in the gear assembly resiliently displaces another gear outwardly away from the first gear to achieve a desired backlash setting.

Abstract: An auto correction device for wearing end play in worm gear set has a correction worm gear, two linking gears and auxiliary linking gears to help power transmission in a smooth manner. The correction worm gear further includes a threaded thrust block, an auxiliary linking gear, a thrust plate, an expansion spring and a base plate. The thrust of the expansion spring against the thrust plate enables the displacement of the auxiliary linking gear and threaded thrust block to thrust against the correction worm gear to impose a force upon transmission gear to enable the transmission gear to lean tightly against the worm gear. Thus, wearing end play between the worm gear and the correction worm gear is eliminated.

Abstract: A planetary worm type gear system in which an integrated worm type gear on a first shaft is driven by a worm set on another shaft, or a separate coaxially driven worm and gear set. The planetary worm type gear system has two or more worm-gears coupled to a ring type internal worm set, and a shaft driven by the ring type internal worm set for output. Alternatively, a rotor arm around the shaft may be driven by the two or more worm gears for rotary output, or both can be driven for differential output.

Abstract: A retractable sootblower having a substantially open frame. The frame includes an inboard end wall, an outboard end wall and a pair of opposingly positioned side panels. The side panels are seamless and mounted to interconnect the inboard end and outboard end walls together. At least one truss extends between the side panels. The side panels cooperating with the inboard and outboard end walls to generally define a rectangularly shaped box for enclosing the carriage and lance tube of the sootblower. This box has a generally open top and bottom which provides substantially unobstructed access from above and below to the carriage and lance tube. The sootblower also includes a mechanism for adjusting the backlash between the drive rack and gear.

Abstract: An apparatus for preventing circumferential separation of the meshing teeth (86, 72) of a blanket cylinder gear (84) and a plate cylinder gear (70) includes a first gear (92) having gear teeth (94) in meshing engagement with the gear teeth (86) of the blanket cylinder gear (84). The first gear (92) is rotatable about an axis. A second gear (108) is coaxial with the first gear (92) and is rotatable about the axis relative to the first gear(92). A third gear (136) has gear teeth (134) in meshing engagement with the gear teeth (132) on the second gear (108). A fourth gear (76) is coaxial and rotatable with the plate cylinder gear (72), and has gear teeth (78) in meshing engagement with the gear teeth (134) on the third gear (136). The apparatus further includes spring means (122) for biasing the first and second gears (92, 108) about their common axis in respective directions that are opposite to each other.

Abstract: A device for avoiding gear flank backlash or chattering of first and second gear trains. Each of the gear trains include a plurality of mutually meshing gear wheels. The first gear train has a first initial wheel and a first end wheel. The first initial wheel is driven. The second gear train has a second initial wheel and a second end wheel. The second end wheel is driven. The first and second initial wheels of the first and second gear trains are non-rotatably connected to one another. A tensioning device is connected between the first and second end wheels and it produces a torque in a preferred rotational direction of the gear wheels of the first gear train. The torque acts between the first initial wheel and the first end wheel and ensures a definite flank alignment of the gear wheels during the operation of the first gear train.

Abstract: A transmission with variable mechanical prestress including a pinion driven by an electric motor, a driven gearwheel with its bearings in a housing, and an electromagnetic actuator for applying a prestress force which is controllable in dependence on an instantaneous load to be handled by the transmission. The electric motor with the pinion is supported so that it can be tilted relative to the housing. Owing to a tilting movement of the electric motor caused by the actuator, the pinion is pressed against the gearwheel with a certain prestress force in a radial direction. The transmission is free from play, while the virtual play arising from friction and hysteresis is strongly reduced, and the positioning accuracy is enhanced as a result.

Abstract: A cutter for use in an electrode tip dresser, which has a cutter holder for holding the cutter and dresses an electrode tip for a resistance welding apparatus, has a rising portion which has a cutting tooth for cutting a front peripheral portion of the electrode tip and a flat portion which faces a front end surface of the electrode tip. The flat portion has a single cutting tooth for cutting the front end surface of the electrode tip. The single cutting tooth extends from that central point of the cutter as and origin which coincides with an axis of rotation of the cutter holder towards a predetermined radial direction. An origin portion of the single cutting tooth further extends beyond the central point towards a direction which is opposite to the radial direction.

Abstract: A driving device for a rotational photoreceptor drum for use in an image forming machine, in which a rotational drive from a motor is supplied through a gear train to the axial shaft of the drum. The shaft is connected to the drum only at the side farthest from the gear train. An inertia member is provided within the drum. A rotational member having a rotational resistance is brought in contact with a non-image region of the drum.

Abstract: A disk drive apparatus for recording and reproducing signals movement-positions a head, mounted on a carriage, in a disk radial direction with the aid of a pinion provided on an output shaft of a step motor and a rack provided on the carriage The rack is attached to the carriage through parallel leaf springs, and press-engages with the pinion by providing a pre-load to the rack via an elastic restoring force caused by flexure of the parallel leaf springs.

Abstract: Device for driving at least one rotary screen printing stencil, comprising first main drive means having a first gear wheel which meshes with a circular toothed element which is connected to the stencil, and the axis of which coincides with the axis of the stencil, second main drive means for moving a web to be printed at right angles to the axis of the stencil and against the stencil, the first and second main drive means being synchronized with each other and an auxiliary drive means with a second gear wheel which meshes with the toothed element, while the auxiliary drive means constantly deliver such a couple that one of the gear wheels drives the stencil and the other gear wheel retains the stencil.

Abstract: The present invention is a method of adjusting backlash for a north-south transaxle. The method includes the steps of forming a case having a first passageway extending longitudinally and a second passageway spaced from the first passageway and being generally parallel to the first passageway and extending longitudinally and a cavity at one end of the second passageway having an opening generally perpendicular to the passageway. The method also includes disposing a transmission assembly in the first passageway and a transfer assembly in the second passageway and a differential assembly in the cavity and engaging the transfer assembly. The method further includes preloading the differential assembly, determining the amount of backlash between the differential assembly and transfer assembly, and adjusting the backlash between the differential assembly and transfer assembly.

Abstract: A device for the rapid precision positioning of a heavy carriage employs stationary positioning bar, for instance a part of a linear electric motor or a gear rack, and a cooperating moving part of the linear motor or a motor attached to the carriage. The carriage is rapidly and roughly displaced with a further drive which may be constituted by a further gear wheel that cooperates with a gear rack and is driven by a separate motor attached to the carriage. This further drive additionally delivers a certain force for the final positioning in such a way that the play between the gear wheel and the gear rack is eliminated by biasing. Instead of a second gear wheel together with its motor a toothed belt, also driven by a separate motor, a pneumatic cylinder or a linear motor may be used. These are mounted separately from the carriage and ar principally fixed in space.

Abstract: A double-acting type dynamic back spacing removed driving system comprises non-reversible transmission worm gear and worm set including two sets of worms coupling with worm gear. When the system is driven, one prime worm continues applying rotary driving force. Whether or not the worm gear is driven, such force would engage upon the prime worm permanently, and another set of worm gear (or co-axially secured at respective worm gear with same or different pitch), due to application worm applies force to worm gear permanently. The displacement-controlling worm is packed always due to worm set being non-reversibly transmitted so no spacing appears between the worm gear and the worm.

Abstract: An anti-rattle system for a gear type transmission including a first part and a second part. One of the parts of the anti-rattle system includes a pair of deformable pressure discs with parallel facing flat surfaces. The flat surfaces of the pressure discs are in parallel planes that are perpendicular to an axis of rotation. The other part includes a friction disc with an outer periphery positioned between the parallel flat surfaces so that the pressure discs are deformed and spread apart by the friction disc. One of the parts is attached to a drive gear and another one of the parts is attached to a gear in mesh with the drive gear. Another one of the parts could also be attached to an anti-rattle assembly counter shaft.

Abstract: The speed reducer comprises a first shaft which is supported so as to be able to slide axially, is suitable for being rotatingly actuated and a pinion whose set of teeth are slightly beveled is located thereon. A second shaft is supported so as to be able to slide axially with an axis parallel to the first shaft and a gear and a further pinion, are located thereon both having sets of teeth slightly beveled in opposite directions and suitable for meshing respectively with the pinion of the first shaft and with a further gear which is fixedly located on an output shaft, coaxial to the first shaft. A device is provided for adjusting the axial position of the first shaft, so as to move the sides of the conical sets of teeth of the gears closer in order to eliminate the related clearances.

Abstract: A planetary reduction gear comprising pairs of partial planetary gears, two partial internal gears and a sun gear or comprising pairs of partial planetary gears, two partial sun gears and an internal gear in which partial planetary gears mesh with partial internal gears or with partial sun gears independently. One of the partial gears is fixed to the input shaft or to the casing. The other partial gear is loosely connected to the input shaft or to the casing by a spiral coupling which allows the partial gear to move in spiral direction. A pressing means pushes the partial gear in the axial direction. Force of the pressing means moves the partial gear in the spiral direction. The partial gear slightly rotates relatively to the other partial gear. Relative rotation of the partial gears cancels backlashes. In the case of helical gears, the spiral coupling can be replaced by an axial coupling.

Abstract: An electric steering apparatus which effects position adjustment by electric drive has a screw shaft parallel to upper and lower columns. A nut member rotatably supported by a housing fixed to a bracket is fixed against movement in the axial direction of the screw shaft and threadably engaged with a screw portion provided at one end of the screw shaft. In a preferred embodiment the other end of the screw shaft is pivotally connected to the upper column for pivotal movement relative to the bracket in the direction of tilt. The nut member is self-aligning in the housing, and the nut member is rotatively driven by an electric motor to move the screw shaft in the axial direction and thereby move the upper column, whereby position adjustment can be accomplished. The apparatus is provided with a back-lash preventing device in which the screw shaft is pressed against the nut member in a radial direction and the threadably engaged portions of the screw shaft and the nut member are urged against each other.