Abstract: A method of aligning a first body and a second body of a structure comprises orienting the first body so that first openings extend vertically and inserting indexing pins into the first openings. The method comprises orienting the second body so that the second openings extend vertically and aligning the second openings with the indexing pins. The method comprises moving the first body and the second body toward each other, while: allowing the first body and the second body to move relative to each other and applying a downward force to the indexing pins. The method comprises moving the first body and the second body toward each other until a first-body second surface contacts a second-body first surface, while applying the downward force to the indexing pins.

Abstract: A method of aligning a first body and a second body of a structure comprises orienting the second body so that second openings extend vertically and orienting the first body so that first openings extend vertically. The method comprises aligning the first openings with the second openings so that a circumferentially closed contour, formed by each one of the first openings and a corresponding one of the second openings is large enough to receive a threaded portion of any one of the indexing pins with a clearance fit. The method comprises moving the first body and the second body toward each other and inserting the indexing pins into the first openings. The method comprises applying a downward force on the indexing pins, while allowing the first body and the second body to move relative to each other.

Abstract: The size of a current detecting apparatus is reduced by employing a small magnetic core, and problems caused by excessive heat generation and vibrations of a bass bar are prevented. In a current detecting apparatus, a current detecting bass bar includes a through portion penetrating through a hollow portion of a magnetic core, and plate-shaped terminal portions continuing from both sides of the through portion. The through portion is formed to have a thickness larger than that of the terminal portions.

Abstract: A screw (2) has a head (5) including an underhead bearing surface (12). Lubricant pockets (13) are arranged at least in a part of the underhead bearing surface (12). The lubricant pockets (13) serve to contain lubricant and to release the lubricant when tightening a screw joint (1) to prevent galling effects during multiple tightening processes.

Abstract: This compound linear flexure bearing incorporates a simple but unique flexure arrangement which inherently allows stable long travel operation. The flexure arrangement passively constrains all degrees of freedom except translation along the bearing axis while also compensating for flexure foreshortening. This design permits large displacement, low operating stress, low operating force, and high stiffness in the five noncompliant degrees of freedom. The linear flexure bearing described herein has applications in precision mechanics, particularly opto-mechanics. Specific applications include but are not limited to wafer and reticle positioning stages used in microlithography systems, optic translation and scanning mechanisms used in tactical and spaceborne systems, as well as flip-in mechanisms used in multiple field of view optical systems.

Abstract: A torsionally rigid flexible shaft coupling, in particular, fully-steel shaft coupling, for transmitting torques between shafts, in particular shafts with axes which are offset relative to one another, having one or two plate packs (5) which are placed on flange sleeves (6) and on the latter, are clamped by means of a ring (4) against an end-side flange (65b) of the flange sleeve (6), wherein the plate packs are clamped in an alternating fashion in the peripheral direction to the sleeves (8) or second hubs (9), which face one another, by means of screws (7) which extend through the flange sleeves (6) and have nuts (2).

Abstract: In an exemplary, non-limiting bushing assembly, a first bushing defines a first opening therethrough. The first opening has a first dimension along a first axis that is sized to receive a fastener therethrough. The first opening has a second dimension along a second axis, and the second dimension is larger than the first dimension. A second bushing defines a second opening therethrough that is sized to receive a fastener therein. Means are provided for engaging the first and second bushings.

Abstract: A locking element for locking in a bolted joint, the locking element comprising one side comprising a pattern of radially extending cams, the main surface of which having a helix configuration, the pitch of the cams exceeding the pitch of the threads involved in the bolted joint. The locking element is especially characterized in that the locking element is a washer intended to be applied as a single locking element in the joint and in that the other, the opposite, side of the washer comprises mechanical means for providing a locking action for preventing rotation between said other side and a surface against which said other side is intended to act. The invention also relates to a bolted joint.

Abstract: A washer has a body having an axis and provided with a first face surface located at one axial side and adapted to cooperate with a nut, a second face surface located at an opposite axial side and adapted to cooperate with an object to be assembled or disassembled, and at least one additional turning resistant surface adapted to cooperate with a bolt, the additional turning resistant surface of the body being formed as a frictional surface providing a friction between the body and the bolt to frictionally impede the bolt from turning and at the same to allow the bolt to be displaced in an axial direction when the nut is turned, the second face surface of the body being formed to provide a friction between the body and the object and therefore to impede the body from turning, and the first face surface of the body being formed with a smaller frictional characteristic than the second face surface of the body to at least reduce dragging of the body into turning by the turning nut; and a fastener is provided with

Abstract: A power tool for fastening objects has a housing with a non-rotatable element, a power drive in the housing and provided with a rotatable driving element, and a fastener part including a bolt having a thread and an axis and introducable into parts forming an object, a nut screwable on the bolt and cooperating with the rotatable driving element, and a washer to be applied between the nut and an object and cooperating with the non-rotatable element, the washer having an axis and being provided with a first bearing face surface located at one axial side and adapted to cooperate with the nut, a second bearing face surface located at an opposite axial side and adapted to cooperate with the object, and at least one third turning resistant surface adapted to cooperate with the thread of the bolt, so that when driving element turns the nut with a given active force in one direction and the washer is held stationarily applied by the non-rotatable element of the housing, the nut turns to tighten or loosen the bolt, and

Abstract: A washer in accordance with the present invention comprises an axial hole and a plurality of oil-bearing portions. The oil-bearing portions are located on an inner surface opposite to an outer surface and surround the axial hole.

Abstract: A friction reducing device comprises a stretchable thin film of elastomeric material impregnated or dusted with lubricating material. The thin film adheres to an annular member through which a fastener element having external threads can pass.

Abstract: A washer in accordance with the present invention comprises an axial hole and a plurality of oil-bearing portions. The oil-bearing portions are located on an inner surface opposite to an outer surface and surround the axial hole.

Abstract: A fastener assembly includes (a) a fastening member that includes an out-of-round portion centered about a longitudinal axis and configured for engagement with a torque-transmitting tool, a frustoconical load-bearing surface that extends radially outwardly from the longitudinal axis, and a threaded portion that is centered about the longitudinal axis; (b) a metallic, frustoconical thrust washer having a concave surface positioned adjacent to the load-bearing surface of the fastening member, and a convex surface; and (c) a pressure ring that includes a flange, a frustoconical load-bearing surface formed by the flange and positioned adjacent to the convex surface of the thrust washer, and a frustoconical undersurface oriented to contact a complementary depression in a workpiece.

Abstract: A slider washer bearing in a bolted interface assembly allows relative differential thermal expansion and contraction motion between a component plate fastened to a base plate by a bolt, without inducing large strains and stresses upon the plates or the bolt. The slider washer bearing, thereby, functions as a thin spacer between the component and base plates, enabling high preload tightening of the bolted assembly while also enabling relative uni-directional alternating motion of the plates. The slider washer includes at least one mating groove arranged unidirectionally and extending horizontally between the top and bottom flexure plates. The grooves provide a guide for relative alternating back and forth unidirectional motion while the full strength of the bolt remains available to support the component plate without allowing high friction shear forces.

Abstract: A clip flexure slider washer bearing in a bolted interface assembly allows differential thermal expansion and contraction between a component mounting plate or flange fastened to a base plate by a bolt. The bearing functions as a thin lubricated spacer between the component plate and the base plate, allowing the bolted assembly to be tightened to a high preload while enabling relative sliding motion without inducing large strains and stresses in the plates or the bolt. The slider washer portions of the bearing are sandwiched between the two horizontal parallel portions of the metal clip flexure. A side portion of the clip flexure bent as a right angle to the horizontal portions and extending vertically from one edge constrains the relative sliding motion of the component and base plate to unidirectional alternating back and forth translation, thus preventing lateral motion.

Abstract: A linear roller washer bearing in a bolt interface assembly allows relative differential thermal expansion and contraction motion between a component plate and a base plate fastened together by a bolt without inducing large strains and stresses upon the bolt. The roller washer bearing functions as a thin spacer between the component and base plates enabling high preload tightening of the bolted assembly while enabling relative bidirectional motion of the plates. The roller washer bearing is a multiple roller assembly with thin rollers arranged unidirectionally and horizontally in parallel between the top and bottom washer plates. The rollers roll back and forth to enable relative back and forth alternating unidirectional motion of the component and base plates while the full strength of the bolt remains available to the support the component plate without creating high friction shear forces.

Abstract: A linear flexure washer bearing in a bolt interface assembly allows relative differential thermal expansion and contraction motion between a component plate and a base plate fastened together by a bolt without inducing large strains and stresses upon the bolt. The flexure washer bearing functions as a thin spacer between the component and base plates enabling high preload tightening of the bolted assembly while enabling relative bidirectional motion of the plates. The flexure washer is a multiple blade flexure assembly with thin flexure blades arranged unidirectionally between the top and bottom flexure plates. The elastic flexures bend to enable relative alternating unidirectional motion while the full strength of the bolt remains available to the support the component plate without creating high friction shear forces.

Abstract: A feed screw including a screw shaft, a nut meshed with the screw shaft and a plurality of rolling members inserted between the screw shaft and the nut, wherein a solid film of a fluorine-containing polyurethane polymer is formed on any portions in rolling/sliding contact. The molecules of this solid film have urethane bonds, and form a three-dimensional reticular structure. Therefore, the film is unlikely to separate, peel off or wear. Accordingly, the feed screw produces less dust, improves lubricating property and thus elongates its life.

Abstract: This invention has as its purpose the provision of a clamp screw in which the loss of clamping force is greatly reduced, a powerful clamping force can be obtained with a small rotational input, a sufficient clamping force can be obtained by a manual operation, and moreover, a sufficient clamping force can be obtained without excessive clamping by making effective use of the reverse thrust of the rotating tool.With the clamp screw of the invention, when the flange ring is in contact with the object to be attached, the rotation of the threaded member stops and a clamping state is entered, the rotation of the operating ring is screw fed by the balls moving around the thread grooves, and as a result of this movement of the operating ring due to the screw feed, pressure is exerted on the flange ring through the restraining ring thus clamping the tool to be attached.

Abstract: An improved fastener assembly is disclosed comprising a threaded fastener combined with two disc shaped washer components wherein one disc component is resilient and mounted to relatively rotate with respect to the threaded fastener and other disc component. A dry lubricant material is provided between the disc components to facilitate the relative rotation.

Abstract: A differential gear assembly comprising a rotatable case, a spider having at least one shaft mounted on the case for rotation therewith, a pinion gear rotatably mounted on the shaft and a thrustwasher non-rotatably mounted on the shaft and disposed between the pinion gear and the case. The thrustwasher includes an outer, arcuate side disposed in opposition with the casing and an inner, substantially flat side disposed in opposition with an outward side of the pinion gear. The thrustwasher includes a central opening for accepting the shaft and substantially flat surfaces forming a portion of the opening and cooperating with longitudinally extending flats formed on the shaft for preventing rotation of the thrustwasher relative to the shaft. The thrustwasher is preferably made of powdered metal and includes lubrication channels which cooperate with lubrication passages formed in the shaft so as to permit the flow of lubricant from the shaft across the outward side of the pinion gear.

Abstract: A locking fastener (10) comprises a nut (12) having a threaded portion (14) formed about a central axis (16) of the fastener. A head portion (18) of the nut is formed integral to the threaded portion (14), for gripping the fastener during tightening or loosening. An inner member (22) is provided coaxial with the head portion (18) and is designed to be mechanically coupled to an underside of the head portion (18) so as to be substantially immobile relative to the head portion. Inner member (22) is provided with inclined cam means (24) in the form of a plurality of cam surfaces arranged in an annular configuration about the inner member (22). A locking member (26) is provided coaxial with the threaded portion (14) and has a matching cam means (28) on one face adapted to rotatably interengage in facing relation with the inclined cam means (24) on inner member (22).

Abstract: A fastener bearing assembly for reducing the turning friction between a head of a fastener and an object to be fastened, for example, a vehicle wheel. The assembly comprises a first part having a first pressure transmitting surface and a second part having a second pressure transmitting surface, and adapted to rotatably receive the first pressure transmitting surface in facing relation thereto. A solid dry lubricant material in the form of an annulus is provided to reduce friction between the first and second pressure transmitting surfaces. In use, the first part rotates with the head of the fastener and the second part remains stationary relative to the surface of the fastened object so that the dry lubricant annulus acts as a bearing between the head of the fastener and the fastened object. A locking member adapted to engage a surface of both the first and second parts may be provided to prevent rotation of the first and second parts relative to one another.

Abstract: A roof control system for underground strata has an elongated bolt adapted for insertion into a hole bored into the underground strata. The bolt is securely anchored in the hole at a location where a significant length of the bolt remains between the opening of the borehole and the anchor. A significant length of the bolt is placed in tension by rotating the bolt at a predetermined torque, with a plate mounted on the bolt and located adjacent to the outer surface of the strata and a nut on the end of the bolt for engaging the plate. The friction between adjacent surfaces which rub against each other when the bolt is rotated is selectively adjusted so that the tension/torque ratio of the bolt is selected to match the desired level for a particular type of strata. A array of friction reducing washers with different contact surface areas are provided so that one can be selected for location between the nut and plate.

Abstract: An article for assisting in the mixing of components of a resin grouting material within a drill hole in a rock formation to form a hardenable mass anchoring the threaded, distal end of an elongated bolt in the hole. The article includes an annular base portion having a central, through opening for threaded engagement with the bolt, and at least one leg extending from the base portion in a direction substantially parallel to the axis of the opening. The article is rotated together with the bolt, the leg having leading and trailing edges with respect to the direction of rotation. The leading edge is a flat surface substantially parallel to the axis of the bolt and the trailing edge is a relatively sharp, linear edge, non-parallel to the bolt axis. The article may be employed in chemical anchors with a single leg extending from the base portion toward the distal end of the bolt, or with a pair of legs extending in opposite directions from the base portion.

Abstract: The anchor bolt assembly is of the tensionable type used in mine roofs and the like in which the anchor bolt assembly is positioned in a bore hole of a rock formation. The bolt assembly includes an elongated bolt shaft with a head at one end and is threaded on the other end and has a mechanical expansion anchor on the threaded end. A bearing having a central opening is positioned on the bolt to engage a face of the rock formation. A two faced graphite coated washer is positioned on the bolt between the bolt head and the bearing plate. During installation, the washer acts as an anti-friction bearing between the bolt head and the plate to improve the torque to tension relationship.

Abstract: An achor bolt assembly for securing a bolt in a bore hole is provided with supporting members for applying pressure against an area surrounding the mouth of the bore hole wherein contacting surfaces of the supporting members are provided with a coating of a latent lubricating material which becomes an active lubricant in response to heat generated as the bolt is rotated and tensioned in the bore hole.

Abstract: A rock bolt assembly incorporating a friction reducing washer of plastics material between the nut and the plate washer to give an increased tension in the bolt for a given torque.

Abstract: A wing nut with a threaded axial passage is adapted to engage the threads on the horizontal balancing shaft of a wheel balancer having an abutment thereon. A wheel to be balanced is placed on the shaft and is arranged to be held in tight engagement with the abutment when the wing nut is threaded on the shaft. The surface of the wing nut which forces the wheel against the abutment is recessed with a cylindrical recess. A plastic insert is adapted to be retained within the cylindrical recess and has a central bore which is aligned with the threaded passage in the nut to permit the balancing shaft to pass therethrough. The insert projects axially from the nut body so that the insert, rather than the nut body, will engage the member which is holding the wheel against the abutment.

Abstract: Fastener assemblies for mounting a workpiece such as a hub centered wheel rim include a threaded fastener and a clamp washer. The fastener includes a body having a thread structure and a structure engageable by a tool for tightening of a threaded joint to urge the fastener assembly against the workpiece. The clamp washer includes a central aperture surrounding the thread structure and interposed between the fastener body and the workpiece. A pair of cooperating bearing surfaces are formed on the inner end of the workpiece and the outer side of the clamp washer, and a clamp surface is defined on the inner side of the clamp washer. When the fastener assembly is tightened against the workpiece, the bearing surfaces comprise continuous annular spherical zones having common centers and radii of curvature to the end that the bearing surfaces are in intimate wide area face-to-face contact and the clamp surface is in flat area contact with the workpiece regardless of the squareness condition of the threaded joint.

Abstract: A roof control system for underground strata has an elongated bolt adapted for insertion into a hole bored into the underground strata. The bolt is securely anchored in the hole at a location where a significant length of the bolt remains between the opening of the borehole and the anchor. A significant length of the bolt is placed in tension by rotating the bolt at a predetermined torque, with a plate mounted on the bolt and located adjacent to the outer surface of the strata and a nut on the end of the bolt for engaging the plate. The friction between adjacent surfaces which rub against each other when the bolt is rotated is selectively adjusted so that the tension/torque ratio of the bolt is selected to match the desired level for a particular type of strata. A array of friction reducing washers with different contact surface areas are provided so that one can be selected for location between the nut and plate.