Backlash take-up

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...     

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...     

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...     

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...     

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...     

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...     

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...     

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,...     

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.

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...     

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...     

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...     

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.

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...     

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...     

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...     

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...     

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...     

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...     

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...     

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...     

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...     

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...     

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...     

In a gear train where there is backlash, the backlash is prevented by a gear drive which includes an anti-backlash driven pinion which is mounted on, or is otherwise connected to, a torsion spring shaft that is adjustable for twisting, and thereby, loading the anti-backlash driven gear.

A gear system adapted to eliminate backlash between a set of reversible gears. The gears are also arranged to perform without backlash when their center distances are changed. One gear of the double helical type fixed to a first shaft is in engagement with a single adjustably secured first helical gear...     

A pivot drive for interconnecting a pair of members that are relatively pivotal about a pivot axis has a torsion rod extending along a rod axis and rotatable by an appropriate drive relative to one of the members. This rod has outer ends carrying input gears of respective constant-mesh gear trains having...     

The meshing bevel gears used to drive the vertical axis looptaker of a sewing machine are preloaded with a compressed resilient member which is prevented from deflecting to a position beyond its elastic limit during the running of the gears.

A marine drive is shown in which a reverse pinion, which is in continuous mesh with a bull gear, is provided with a detuner to prevent vibration while it idles. The detuner includes a ring gear detuner pinion disposed about the reverse pinion shaft. The detuner pinion has helical teeth as do the reverse...     

A pressure control valve including a valve, a spring for pressing the valve, and a power input means for compressing the spring further comprises a backup force-generating mechanism for producing and directing a backup force counter to the direction in which the reaction force due to the compression...     

An anti-backlash nut assembly is disclosed for longitudinal movement along a screw which has an external thread thereon, in response to relative rotational movement between the nut assembly and the screw. The assembly includes a first nut part having an internal thread complementary to the external thread...     

An elevator apparatus comprising a reduction gear unit having reduction mechanism of rotary parts of parallel axial gears, an input shaft and an output shaft as main parts; a main rope suspending a car and a counterweight; a traction sheave which is directly connected to said output shaft and on which...     

An anti-backlash nut construction wherein a base portion that is adapted to be carried by a machine part, has a bore through which a lead screw can pass. The nut has a threaded portion which is connected to said base portion and which has a bore matching with the bore of the base portion, said threaded...     

Disclosed is a carrier moving mechanism for preventing occurrence of the backlash between a screw shaft and a carrier transmitted by this screw shaft. This carrier moving mechanism comprises a screw shaft and a carrier having secured thereon first and second nuts having teeth to be engaged with the lead...     

A load-splitting transmission has its drive shaft journaled with respect to the housing in an axial bearing and supported only by a radial bearing forming part of the clutch connecting said drive shaft to the output shaft of an engine so that the axis of the drive shaft is swingable relative to the housing....     

A tilt drive is provided for a metallurgical vessel which is mounted on a large sprocket wheel driven by two or more reduction gears. The reduction gears are joined by a torque equalizing apparatus which transmits torque from the pinion of one gear to the pinion of the other, thus acting as a forced...     

An improved ball nut having adjustable preloading comprises a pair of ball nut halves both in threaded engagement with a ball screw. Only one of the nut halves is secured to a movable machine member, the other nut half being movable to the relative fixed nut half. Separating the two nut halves is a pair...     

A printing mechanism includes a right-angle drive for imparting rotation to a rotary printing element having printing type thereon, rotation of the print element selecting a specific character to be imprinted on a printing medium. The right-angle drive permits the printing element to be moved transversely...     

A differential gear for automotive vehicles comprising a washer interposed between the backs of pinions and the inner surface of a differential casing and fitted to a pinion shaft. The washer has at most a thickness of l tan.alpha. wherein l represents a displacement from an uncompressed condition of...     

To obtain unequal angles of turn for two-steerable wheels of a vehicle inexpensively, each wheel is turned through a gear. The two gears have a center to center distance corresponding to the track of the steerable wheels and are dimensioned to accommodate therebetween a meshing pinion mounted eccentrically...     

The teeth of the sun pinion, planet wheels and hollow wheel have a profile correction changing continuously along the gear width and varying in opposite directions between the meshing gears. The sun pinion, hollow wheel and planet carrier are so mounted as to be fixed in the axial direction, whereas...     

A gear arrangement is provided for precisely driving a goniometer in an X-ray apparatus with zero backlash. This arrangement involves structure for maintaining a preload between a driving pinion gear and a spiroid gear rotating an output shaft. The preload structure may be formed by way of a diaphragm,...     

A clutch interlocking mechanism for use in a pushbutton tuner wherein a drive gear provided on a clutch mechanism is meshed with a rack of a memory slide, a support bracket, on which the clutch mechanism is mounted, is supported, at one side thereof, by a frame on a chassis through a fulcrum pin and,...     

An adjustable mounting for a shaft on a thin metal support plate wherein a cylindrical lounting flange is punched out of the plate to form an opening, and a bearing is rotatably mounted within the opening. The bearing has a radial flange engaging the external side of the plate and has a threaded inner...     

A servo-motor assembly for a machine slide having a rack and pinion drive that includes a servo-motor support with a pinion carrying output shaft all totally supported by and cantilevered on a pair of normally flat parallel springs that bias the motor support and pinion toward the rack to eliminate backlash.

An anti-backlash mechanism for a machine drive is disclosed, wherein a shaft carries a rotary worm wheel having drive connections to the tangs of two back-to-back clutch units. The first clutch unit is connected to a rotatable shaft, concentric with the worm wheel, and having a first helical gear on...     

A damping system for a drive train having a cam coupling mechanism which advances an intermediate member axially along a driven shaft under high torque loads. The intermediate member is spring biased and is associated with a variable volume chamber containing fluid. Damping mechanisms are positioned...     

A gear assembly for automobile transmissions includes a pair of driving and driven gears permanently in meshing engagement with each other to provide a torque transmission therebetween, and an additional gear relatively rotatable at one side of either one of the gears and being permanently in meshing...     

A bevel gear backlash adjusting mechanism is disclosed in which a bevel gear is carried by a bearing and is rotatably carried by a stationary shaft so as to be axially shiftable therewith. The stationary shaft includes a supporting portion carried by the frame of a power tool, the supporting portion...     

A zero backlash device. The device includes a spring loaded bracket for providing a lateral force to the driving nut on a threaded rod. This lateral force is directed perpendicularly to the axis of the threaded shaft thus insuring continued intimate contact between the threads on the driving nut and...     

A steering wheel includes a steering shaft, column and pad sun gears mounted on the steering shaft for rotation relative thereto, a boss plate mounted on the steering shaft between the sun gears and rotatable in unison with the steering shaft, at least one bearing mounted on the boss plate and movable...     

An internally splined rotary anti-backlash component is adapted to engage an externally splined injection-pump shaft end. Fixing pins extend radially through the component and have wedge-shaped ends which protrude into gaps between the splines of the shaft end. This inhibits backlash between the component...     

A gear assembly for high-speed transmission between either two parallel shafts or two intersecting shafts comprising two meshing gears, one mounted to a drive shaft and the other mounted to a driven shaft, each of the gears having coaxially disposed first and second toothed portions which differ from...     

In a tilt steering equipment including a main bracket mounted to a vehicle body; an upper bracket with a steering wheel, which is pivoted at the main bracket around a tilt center; and a driving means supported by the main bracket to tilt the upper bracket against the main bracket, the driving means in...     

A steering mechanism in a motor vehicle having front and rear wheels steerable in response to steering operation of a steering wheel. An input shaft rotatable about its own axis in response to steering operation of the steering wheel has an eccentric shaft mounted on a rear end of the input shaft. A...     

A feed mechanism for moving a read/write head in a disk drive unit includes a pinion drivable by a motor, a rack held in mesh with the pinion, a support on which the rack is pivotally mounted and which is movable with the rack in a linear direction, and a compression resilient member such as a compression...     

A zero backlash shiftable transmission includes an input shaft and an output shaft coupled through a gear network that is preloaded with a spring arrangement to eliminate the backlash from the engaged surfaces of the gear teeth. There are three positions and no neutral. In the first position a tapered...     

An industrial robot is disclosed which is movable about six revolute axes, and which is modular in nature, to permit it to be configured to efficiently operate in a number of different applications. The robot includes a support stand defining a first primary axis, a waist which is rotatable about the...     

A driving connection between spline shafts and spline bore hubs of safety steering columns, where the shaft and the hub, because of prestressing torque existing between the two, can be shifted with respect to one another axially but are free from torsional play. The prestressing torque is generated by...     

A fluid-powered helical actuator including a cylindrical body; a rotatable output member supported for rotation relative to the body and connectable to an external device; first and second independently rotatable sleeves reciprocally mounted within the body; a piston reciprocally mounted within the body...     

In a manual power transmission for automotive vehicles, a gear noise suppressor and vibration isolator includes elastomeric sleeve preferably fitted within several holes through the thickness of the gear wheel, angularly spaced about the axis of the wheel. The spacers define a space within which a metal...     

A shaft assembly (11) having a spline (16) with an anti-backlash device operable due to centrifugal force to engage both sides of internal spline teeth during rotation. The spline (16) includes a main force transmitting portion (18) and a moveable spline sleeve (22) which during operation engages the...     

A gear assembly for high-speed transmission between either two parallel shafts or two intersecting shafts comprising two meshing gears, one mounted to a drive shaft and the other mounted to a driven shaft, each of the gears having coaxially disposed first and second toothed portions which differ from...     

The invention is an anti-backlash gear assembly. The gear assembly comprises first and second gears mounted on a common shaft and rotatable with respect to one another about the axis of rotation. The first gear has a slot. A fastener having a threaded end extends from the far side of the second gear...     

Herein disclosed is a controlling transmission to be used with an industrial robot or the like, which is constructed of a planetary or star gear mechanism having at least one pair of intermediate gears arranged between a sun gear and an internal gear. The paired intermediate gears are set by the movement...     

A gear system has a planetary gear (5) mounted on a conical main shaft (8) in such a manner to move axially thereon, the planetary gear being in meshing engagement with a central gear (3). A receiving device is provided to receive thrust generated at the planetary gear (5). When a plurality of planetary...     

A steering gear mechanism includes a housing and a worm gear having an input portion. The worm gear is supported for rotation in the housing. A sector gear has teeth in meshing engagement with teeth formed on the worm gear. The sector gear has an output portion. A circumferentially expandable spring...     

An antibacklash gear system wherein a pair of gears mounted for limited movement therebetween are biased by a spring to move the teeth of the gears out of register, the spring serving as a link between two levers mounted on one of the gears. The position of one of the levers may be adjusted to vary the...     

A power steering system uses an electric motor to produce an auxiliary torque which is added to the torque applied to the steering wheel of a vehicle by the driver. The system includes a couple mechanism for coupling the motor to the steering shaft. The system further includes a converting mechanism...     

A Belleville spring is interposed between adjacent end faces of a retainer and an adjuster for preventing a rattling sound of a steering gear. At least one of the end faces is conical in such a way as to taper in the same direction as the Belleville spring. The taper angle of the conical end face is...     

A transmission for controlled equipment consists of a pair of intermediate gears in mesh with an input gear, another pair of intermediate gears in mesh with an output shaft and a pair of intermediate shafts, each connecting one of the intermediate gears engaged with the input gear and one of the intermediate...     

The invention is an anti-backlash gear assembly comprising a first gear rotatably mounted to a shaft incorporating a first slot partially therethrough which is aligned with the longitudinal axis of the shaft. A second gear is rotatably mounted to the shaft and has a second slot extending completely therethrough...     

The bending and turning movements of the wrist are brought about by drive motors via at least one gear train, in which a cylindrical gear pinion drives a cylindrical gear wheel via an intermediate wheel. For adjusting the backlash, the intermediate wheel is journalled on a movable support which makes...     

There is provided a backlash control rotation gear assembly for robotic applications, with such assembly comprising an input device to provide rotational force of a predetermined maximum torque. The system further includes a first drive gear which is connected to the rotational input device and a second...     

A linear actuator includes a single drive gear that engages two driven gears of the same pitch diameter, which in turn drive a spindle and a sleeve, respectively. The sleeve is internally threaded to receive the spindle, which is externally threaded. The sleeve and spindle are driven rotationally at...     

A work piece positioning device which has a table upon which the work piece is supported is disclosed. The table is rotatably mounted on a sub-assembly which is tiltably mounted on a frame such that the work piece can be positioned in any desired predetermined attitude. Two worm gear systems are utilized...     

An improved support ring (50) is disclosed for supporting a plurality of planetary gear sets (20) which are driven by a centrally disposed input shaft (12) having a sun gear (16) attached thereto in which the planetary gear sets are subject to radially inward loads. The support ring (50) includes an...     

A fluid-powered helical actuator including a cylindrical body; a rotatable output member supported for rotation relative to the body and connectable to an external device; first and second independently rotatable sleeves reciprocally mounted within the body; a piston reciprocally mounted within the body...     

A manipulator drive mechanism employing splined shafts in both a vertical and a horizontal axes. The horizontal splined shaft is rotatably driven by a rack assembly and a pinion gear rotatably fixed with respect to the horizontal splined shaft and which is also slidable along the horizontal splined shaft.

An anti-lash gear mechanism is provided to reduce the noise in a gearing system. The anti-lash mechanism has a gear member disposed for rotation axially adjacent one of the power transmitting gears in a gearing system. The anti-lash gear has one more tooth on the periphery than the power transmitting...     

There is disclosed a gear system wherein a gear (5) is mounted on a conical main shaft (8) in such a manner to move axially thereon, the gear being in meshing engagement with a gear (3) and a receiving device is provided to receive thrust generated at the gear (5). When a plurality of gears (5) are employed,...     

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...     

In a gear arrangement consisting of two gears meshed with each other, at least one gear is constructed of a teeth portion having teeth along its circumference and a shaft portion adapted to be mounted to a support shaft, a gap space is retained between the teeth portion and the shaft portion, and an...     

A tool is provided for adjusting the bearing pre-load and backlash of a differential. The tool has a U-shaped positioning member with an adjustable width base. Bi-directional ratchet heads are provided on the ends of the U, with tools thereon for engaging the side quills of the differential. Setting...     

A reclining angle adjustment device for a seat includes a shaft having a concentric portion and an eccentric portion and rotatable for adjusting the reclining angle of the seat, the eccentric portion comprising an axially movable tapered ring, a gear train including an external gear and an internal gear...     

A transmission is equipped with a planetary gear type transmission unit disposed between an input member and an output member within a casing. The transmission unit is comprised of a sun gear, a ring gear and a plurality of planet gears carried by a carrier coupled with the output member. The planet...     

A reclining angle adjustment device for a seat includes a shaft having a concentric portion and an eccentric portion and rotatable for adjusting the reclining angle of the seat, a tapered bushing having a tapered inner peripheral surface engaging the eccentric portion along the shaft, a gear train including...     

A controlling transmission comprising a planetary gear mechanism in which at least one pair of intermediate gears are interposed to mesh with a sun gear and an internal gear and in which intermediate shafts respectively supporting the intermediate gears are fixed on a carrier. The indexing positions...     

Backlash or play is avoided in a mechanical, self-adjusting gear drive having two sets of gears arranged in parallel to each other by one or more torsion springs effective between a driving shaft and a driven shaft. The gear sets form a closed gear train which contains the prestressed torsion spring...     

The fluid-powered actuator having a body, an axially extending rotatable shaft with a plurality of helical grooves, and an annular piston sleeve reciprocally mounted within the body and receiving the shaft therethrough. The piston sleeve has a plurality of radial bores extending fully therethrough with...     

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...     

A motorized anti-backlash actuator having an externally threaded rod (18) movable linearly while in rotational engagement with an inwardly threaded anti-backlash nut portion (10) and an armature (8) fixed to the nut and rotatable therewith. A field coil (4) (6) surrounds the armature (8) to excite it...     

A gear backlash adjusting mechanism includes a worm wheel having a gear tooth that engages the gear tooth of a worm. The gear tooth of the worm wheel is curved or tapered upwardly in the axial direction toward one end of the worm wheel. An adjusting apparatus permits the distance between the gear tooth...     

A reversible anti-backlash power transmission for selectively transmitting power in opposite directions without backlash in the gear train. The transmission includes interconnected first and second gear boxes. Each gear box includes a drive shaft having a worm associated with the drive shaft for rotation...     

A reclining device for vehicle seats utilizes a differential reduction gear (A) and a small size high speed motor (27) as a drive source, wherein one gear (10) having a plurality of slots (15) positioned radially outwardly from the axis of the gear is between another gear (16) having a corresponding...     

A shaft bearing structure comprises a shaft which is to be rotatably supported, a bushing disposed on the shaft, the bushing having an outer surface tapered in an axial direction so as to have a frusto-conical configuration, a support member having a support opening for receiving the bushing, the support...     

An antibacklash gear drive system including an internal ring gear (46) engaged with a pinion gear (76) powered by a motor drive assembly (48). The motor drive assembly together with the pinion gear is mounted on an eccentric plate (58) so that the rotational axis (72) of the pinion gear is offset from...     

A gearing system for a lathe is shiftable from a first position, in which conical gear wheels (16, 25, 26, 36) engage each other with play, to a second position, in which the wheels engage each other without play. Reduced wear is achieved in the first position. High precision is achieved in the second...     

In order to improve a spindle drive for machine tools, comprising a housing, a spindle mounted in the housing, a drive motor arranged on the housing and a gear arranged in the housing and comprising an intermediate shaft driven by the drive motor and mounted in the housing via two shaft bearings spaced...     

A power splitting transmission, particularly for high energy and/or for high rotational speeds. Two sun gears are connected to the shaft of a drive starting and stopping mechanism and are coupled to each other by at least three double power splitting gears which are arranged equidistantly about the circumference...