Abstract: High pressure jackscrew connectors for removably attaching a first component to a second component having an internally threaded member. One preferred embodiment described includes a panel mount member which is attached to the first component to be joined. When attached to the first component, the panel mount member retains an internally threaded ejector member. A pressure inserter member having a longitudinally extending externally threaded portion engages with the internal threads of the ejector member and the internal threaded member of the second component to pull the ejector member towards the pressure inserter member and push the first component towards the second component upon rotation of the pressure inserter member.

Abstract: A thread coupling for percussive drilling has a first drill string element (2) with an internal thread (3) and a second drill string element (6) with a spigot (7) which is provided with an external thread (8) for cooperation with the internal thread (3). A contact surface (10) on the second drill string element (6) is lined with a wear resistant additional material which covers 50-100%, preferably, 50-90%, of the contact surface. The wear resistant material is preferably a stellite which has been applied by means of plasma welding, or is a ring which has been soldered to the contact surface.

Abstract: An adjustable column connector apparatus which provides for quick, easy and accurate installation of columns during building construction. The apparatus includes an inner connector member with a threaded socket, and an outer member with a corresponding threaded body which mates with the threaded socket. The inner connector member is attached to a column end by screws. The threaded body is engaged in the threaded socket, and the outer connector member is rotatably attached to an adjacent structure by a lag which slidably fits within a slot in the outer connector member. The outer connector member is rotated relative to the inner connector member to advance or retract the threaded body within the threaded socket and correspondingly draw down or push away the adjacent structure relative to the column end.

Abstract: A threaded rod is fitted to a plug-in assembly which can be inserted into a mounting rack, which threaded rod is aligned in the insertion direction and becomes operatively connected to a motor-driven threaded nut during insertion. The first thread pitches are designed such that the rod and nut latch on one another.

Abstract: The present invention relates to a device for fastening a rotatory drivable tool to the head of a technoscope by screwing a tool holder provided at the proximal side end of the tool to the distal end of the shank of a drive spindle. To secure undesired detaching of the tool from the technoscope, the tool holder is additionally screwed onto and against a cylinder sleeve which is run through by the shank of the drive spindle and rotatably mounted in the technoscope head.

Abstract: An inventory control collar incorporating a resident memory for use on a cylindrical neck of a storage container comprising an electrically insulative housing having a central opening sized to fit around the cylindrical neck of the storage container, and a circumferential groove located in the top of the housing. A first conductive ring inserted into the circumferential groove in the housing is electrically connected to the first terminal of the memory and a second conductive ring inserted into the circumferential groove in the housing is electrically connected to the second terminal of the memory. An electrically insulative retainer ring is inserted into the circumferential groove between the first and second rings. Data is conducted to and from the memory by electrically contacting the first and second conductive rings.

Abstract: An electronic device mounting structure, which allows threaded engagement with a standardized male screw compliant with the JIS, DIN or the like without having to perform tapping on a plate material, includes an engagement hole having first and second cutouts formed in a peripheral edge section thereof, wherein the peripheral edge section of the engagement hole is deformed in the plate thickness direction such that there is a positional deviation from a first peripheral edge end section bordering on the first cutout toward a second peripheral edge section bordering on the second cutout by approximately one half of the pitch of a standardized male screw compliant with the JIS and a further positional deviation from a third peripheral edge end section bordering on the second cutout toward a fourth peripheral edge end section bordering on the first cutout by approximately one half of the pitch, with the result that there is a positional deviation corresponding to one pitch of the male screw between the first and

Abstract: A quick change coupling is provided which is especially suitable for a flexible cable. It includes a rotary driving assembly which includes a source of rotary power, a driving adaptor section which is coupled to and rotated by this source, a driven adaptor section which is arranged in nesting relationship with the driving adaptor section and a cable which includes a shield and a core and is connected to a tool. The core is engaged with the driven adaptor section and is rotated by the same. Also provided is a shield adaptor section which engages the shield of the cable and is displaceable by the same to engage the driven adaptor section to urge the latter to penetrate into the driving adaptor section. A locking section is included which is effective upon penetration of the driven adaptor section into the driving adaptor section by a predetermined amount to fix a nesting relationship with the same.

Abstract: A threaded paper tube includes a multiple paper tube having an inner tube with spiral ridges on its outer surface, and an outer tube and a tightening robe each having grooves on their inner surfaces which are in the same pitch as the spiral ridges. The total length of the threaded paper tube may be changed by adjusting the screwing extent between the inner and outer tubes, and the total length may then be fixed by tightening the tightening tube against the outer tube. The ridges and grooves are provided as steps formed on the inner tube's outer surface, the outer tube's inner surface and the tightening tube's inner surface using a ribbon-like shaped paper material which is adhered and fixed at the same pitch on the surfaces of the tubes.

Abstract: The acetabulum (1) comprises a semispherical support shell (2d) whose inner surface (20) has at least three retaining means (2b) which protrude into the interior. Furthermore, the acetabulum (1) comprises a semispherical inner shell (3) which can be inserted into the correspondingly dimensioned semispherical support shell (2d). The outer surface (30) of the inner shell (3) has at least one recess (3b) extending in a helical manner, in such a way that the inner shell (3) can be rotated into the support shell (2d) with a screw motion, thereby resulting in operative connection between the protruding retaining means (2b) of the support shell (2d) and the recess (3b) extending in a helical manner of the inner shell (3), so that the inner shell (3) is retained in the support shell (2d).

Abstract: A threaded connector is disclosed for attaching a handle to a tool head, such as a rake or a broom. The threaded connector may include a central cap or plug and a plurality of opposed wings extending radially outwardly therefrom. The wings are in the form of hollow partial cylinders and are hingeably attached to the cap. The cap is positioned on the end of the handle and the wings are folded downwardly and inwardly to engage the handle. Each wing includes partial thread segments that register to form a full thread when the wings are folded together. The full thread has a shallow taper such that tightening of the connector within a mating socket in a tool head causes the connector to bind or wedge itself into the socket. To provide additional resistance to loosening a locking ring has longitudinal mortices which key into aligned rabbets in the connector and in the socket.

Abstract: A method and apparatus for separably connecting a first surface to a second surface. The apparatus includes a connecting member provided with a threaded end. A rotatable body threadably engagable with the threaded end is rotatably supported against the first surface for rotation about the threaded end to separably connect the connecting member. The rotatably supported body and the connecting member are restrained from rotation. The connecting member and rotatably supported body further have a selected matching thread geometry such that a tensile load applied to the member when connected with the rotatably supported body is resolved as a torque applied to the rotatably supported body sufficient to urge the body to rotate. When the rotatably supported body is released and allowed to rotate, the threaded member translates and threadably disengages the rotatably supported body to separate the connection.

Abstract: A seat post assembly for bicycles includes a seat post made from a hollow tube having a close top end and an open bottom end, the open bottom end of the seat post having an inner thread, an inner tube mounted inside the seat post for storing things, the inner tube having an inner thread at a bottom end thereof, and a stepped screw cap threaded into the inner thread of the seat post and the inner thread of the inner tube to hold the inner tube inside the seat post.

Abstract: A laboratory apparatus, in particular a magnetic stirrer (1) or a shaker, has a receptacle (2) for a stand rod (3), the receptacle being provided in a separate stand-rod holder (4) which can be fastened to the laboratory apparatus in such a way that it is adjustable and can be fixed into position. As a result, the stand rod (3) can be fixed at various locations on the apparatus, so that each of the accessory devices connected to it, in particular sensors, dosing devices, or tubes, can be better fixed in their desired position. In addition, several stand-rod holders (4) with one stand rod each can be fastened at various locations on the laboratory apparatus at the same time, so that even in the case of complex experimental set-ups there are sufficient fastening options available for the accessory devices.

Abstract: A modified shift housing and shift mechanism for a manually shifted automotive transmission is provided by replacing the existing shift housing and complicated components for activating the selector shafts. The modified shift housing is provided with bored passageways to accommodate three connecting rods which forwardly link to a remotely located shifter and rearwardly engage the existing selector shafts, thereby eliminating the more complex and delicate shift linkage mechanism normally used with VOLKSWAGEN automotive transmissions.

Abstract: A nock system including an insert and a nock. The insert having an introduction end, a receiving end located opposite the introduction end, a substantially cylindrical body extending from the receiving end to the introduction end, and a receiving chamber having an opening at the receiving end and extending a distance into the cylindrical body. The receiving chamber is axially aligned and communicates with a threaded duct which extends farther through the cylindrical body toward the introduction end. The nock comprises a string receiving end for receiving a bow string and an engaging shank located opposite the string receiving end. The engagement shank has a shape and size permitting self-tapping, threaded engagement between the engaging shank and the threaded duct. A compression shank extends between the furrowed end and the engaging shank. The compression shank has a shape and size to produce a friction fit within the receiving chamber as the engaging shank is positioned within the threaded duct.

Abstract: A dual-purpose arrow shaft insert for pressing into a hollow arrow shaft at either end of the arrow shaft to facilitate the attachment of a nock or arrow point thereto. The insert has an introduction end, a receiving end, and a central cylindrical portion connecting the introduction end to the receiving end. A receiving orifice is formed within the receiving end and extends from the receiving end into the central cylindrical portion of the insert and terminates in a threaded opening which continues farther into the central cylindrical portion toward the introduction end. The receiving orifice is so sized and configured so as to be capable of receiving the shank of a nock. Without any modification, the dual-purpose insert may also receive a point through the receiving orifice. The threaded rod attached to the arrow point is thrust through a shock absorbing sleeve and both are then pressed into the receiving orifice.

Abstract: A coolant pump system features a pump impeller supported on a pump shaft without bearings, and an axially in-line drive shaft with bearings coupled to the pump drive shaft. The system minimally includes a pump body having a bore therein, a coolant pump impeller, a pump shaft passing through the bore and having the impeller mounted on one end thereof, and a bearingless seal shaft assembly disposed in the bore which prevents coolant from leaking out of the body around the rotating pump shaft. The outer end of the pump shaft and the drive shaft are designed to be quickly disconnected to allow simpler, easier, less expensive interconnection of or replacement of the coolant pump, should that ever be necessary.

Abstract: Disclosed is a leader or line used for fishing. The leader or line, which may be a monofilament line, has a threaded portion on one end thereof that allows it to be attached to a threaded connector attached to a separate line. The leader of this invention is especially suitable for providing a quick and easy attachment or a monofilament tapered or non tapered leader to a fly line. Also disclosed is a connector that is used to connect the end of the fly line to the threaded end of the leader.

Abstract: A compression fitting comprises co-operating first and second members, a first member being in the form of a sleeve-like member or a plug-like member and having a groove therein which reduces in depth from one end of the groove to the other, and a second member adapted to be located in said groove and to be movable relative thereto and comprising a member in the form of an elongate tapered wedge formed into at least part of a helical coil, relative rotation between said first member and said wedge member enabling the compression fitting to be tightened onto a receiving member.

Abstract: A pedal rod is made of two separate pieces, a rod part and a head part, joined together by a crimped joint having as many as six elements. The parts may be selectively plated and/or coated to provide environmental resistance or color coding.

Abstract: An adjustable optical element mount having a pair of ball elements, respectively attached to a base and optical element, within a pair of sockets positioned at opposite ends of a spindle which supports a screw actuated cam element positioned within the spindle and between a pair of plungers which simultaneously engage and clamp the both ball elements against the sockets in response to rotation of the screw to hold the ball elements in a desired position.

Abstract: A high dynamic strength or fatigue resistance is achieved in a taper thread reinforcing bar splice for use in steel reinforced concrete by coordinating the elongations of the coupler sleeve and bar to achieve the required movements of the coupler sleeve at the mouth. This is accomplished in the preferred embodiment by two attenuation grooves on the outside of a circular cylindrical coupler body at each end, each groove being placed in a particular axial relationship with respect to the end of the coupler sleeve and the area of thread engagement with the bar. The grooves are of different depths, with the groove closest to the mouth of the coupler sleeve being the deepest. Also the diameter of the circular cylindrical coupler body at each end is selected so that the wall thickness at the mouth is as thin as possible. At the center of the coupler sleeve there is an enlarged portion extending axially several threads beyond the last thread of each bar joined.

Abstract: A releasable quick-coupling fastener assembly includes a backing sheet (22) having a number of apertured ovaloid bosses (24, 76-90) each presenting a resilient inboard wall structure (108) and resilient inner connective walls (110 and 112) from which depend inwardly extending lip members (118 and 120). The assembly further includes a threaded member (20) having a head (26) and a helically flighted shank (38) for insertion within a boss aperture (106) through a straight application of force by which the shank thread structure (40-54) deformably engages the lip members (118 and 120). The threaded member (20) and be released from engagement with the boss (e.g., 24) through counterclockwise rotation.

Abstract: The present invention relates to a shaft-hub linkage which has a plurality of wedge-shaped projections on the peripheral surface of the shaft and a corresponding number of wedge-shaped recesses on the inner peripheral surface of the hub.

Abstract: A double eccentric fastening mechanism releasably mounts brackets to a miary vehicles or other objects where mounting locations on individual vehicles vary in positional relation to one another. The fastening mechanism has a first eccentric member comprising a first collar whose stepped outer diametrical surface closely fits in a complimentary stepped bore in the bracket. The first eccentric member also has a second collar fixed to and eccentric with respect to the first collar. A second eccentric member has a circular portion and a flange affixed concentrically to the circular portion. The circular portion and flange closely fit in the second collar. A socket on the second eccentric member is eccentric relative to the circular member and accepts a fastener, such as a bolt, that attaches a towing lug to the socket. The double eccentric mechanism also includes a plate that faces against the first and second eccentric members so as to inhibit rotation of the eccentric members relative to the bracket.

Abstract: In the case of a shaft coupling for bottom cylinders of drafting units on spinning machines, a shaft is provided on its end with an area of a reduced diameter which engages in a longitudinal bore at the end of the other shaft. In the area of the longitudinal bore, the two shafts are connected with one another by means of a screw thread. In addition to the screw thread, the area of the reduced diameter also comprises two centering surfaces with fits, one fit being a clearance fit and the other fit being a press fit. As a result, radial deviations of the shafts caused by the shaft coupling are to be avoided.

Abstract: A pedestal fan which is lightweight, is readily capable of disassembly for shipping, storing and use which includes a base with optional weight, a two-piece tubing member one piece of which is detachably retained in the base, the pieces retained together by a connector, and with the other tubing piece detachably retained in a yoke which supports a fan outer housing which is tiltable for air direction variance, which housing contains a fan motor and blade and provides air flow. The tubing pieces are of different lengths which permits mounting the housing at different heights above the base for multi-height cooling needs.

Abstract: A connector for connecting a shaft to an implement, for example for connecting a handle to a mop head, comprises two engageable components for mounting on a shaft and an implement respectively. One of the components has a boss formed with an internal threaded socket and an outer peripheral surface. The other component has a central threaded spigot which screws into the socket, and a shroud, surrounding the spigot and spaced therefrom, which is internally tapered and frictionally engages the outer surface of the boss for added support.

Abstract: A device for connecting in rotation two substantially coaxial elements (10,12), of the type comprising a splined shaft (10,20), a splined hub (24) and clamping elements for achieving a relative axial immobilization between the splined shaft and splined hub. A first end portion of the splined shaft (20) is provided with a centering ring (30) having an outer surface (34) including an outer screw threading (36) having unsymmetrical flanks, which ring (30) is screw-threadedly mounted in a corresponding portion (42) of the splined hub (24) comprising a complementary tapping (44) having unsymmetrical flanks. The second end portion (46) of the splined shaft (20) comprises an outer screw threading (48) on which is screw-threadedly mounted an axial clamping nut (50) having a radial face (52) cooperating with a confronting radial face (54) on the splined hub (24). The invention is of utility in connecting in rotation a power shaft and a rotating element of a turbomachine.

Abstract: A clip for an airplane stringer supports wires, conduits and the like which are located in the fuselage. The clip has several embodiments for attachment to S-shaped or Z-shaped stringers. Those embodiments of the clip which are attached to S-shaped stringers each have a left end which fits over and around one end of the stringer, and a right end which includes a slot for receiving therein the opposite end of the stringer. The width of the slot is controlled by various mechanisms. The stringer end is retained inside the slot by a ledge or lip portion of the clip which lies over the stringer above the slot. The embodiment of the clip which is attached to Z-shaped stringers includes an upper element which is connected to a separate lower element by a bolt. The upper and lower elements fit about one end of the stringer in an interference fit.

Abstract: Apparatus to axially hold a featureless shaft has an abutment for abutting the side of the shaft and a cam to wedge the shaft against the abutment. The cam has a convexly radiused face which is generally opposed to the abutment. The generating radius for the face is offset from the pivot axis of the cam in the direction in which a shaft is inserted into the apparatus. Consequently, once the cam wedges the shaft against the abutment any withdrawal force on the shaft will tighten the wedging effect since the eccentric radiused face will attempt to move closer to the abutment.

Abstract: A mechanical connection for concrete reinforcing rods has a connecting sleeve and a reinforcing rods having protuberances (e.g., ribs or fins) on their outer surfaces. Each of the reinforcing rods has a threaded end for connection with the connecting sleeve, which has tapped portions for receiving the reinforcing rods. In one embodiment, a first end of a first reinforcing rod is passed completely through the sleeve, and the sleeve is then rotated about the end while simultaneously being screwed onto a second end of a second reinforcing rod. Upon tightening the connecting sleeve, the ends of the first and second reinforcing rods are placed in substantially coaxial, end-to-end arrangement, and are rotationally immobile. In a preferred embodiment, the connecting sleeve comprises a sheath having a conical bore, together with a conical socket in the form of two shell halves, which, when place together, provide two internal tapped portions having opposing threads.

Abstract: A device for splaying a plurality of pole members from a generally axial orientation to a generally radial orientation, the device including a pair of generally parallel disc-like transverse members, each pole member having a first end pivotally mounted on one of the transverse members and a lever and cam mechanism for urging the transverse members axially together to clamp the first end of each pole member in a generally radial orientation.

Abstract: A joint for a vehicle steering linkage comprises a housing and a ball stud. The housing has a socket which contains the ball end of the ball stud, and has a sleeve which receives the end of a tie rod. The sleeve has an external, first clamping surface which is inclined with respect to the axis of the sleeve. The joint further comprises a clamp which clamps the tie rod in the sleeve. The clamp includes a clamping member and a threaded nut. The clamping member has a second clamping surface, and is free of a thread for engaging the thread on the tie rod. The threaded nut moves the clamping member relative to the sleeve and the tie rod, and moves the second clamping surface in sliding contact with the first clamping surface.

Abstract: An interchangeable handle and utility tool head system where different tool heads are used with the handle. The different tool heads have similar shanks with a screw threaded end. The handle has a female coupling on one end to receive the screw threaded shank. A positive securing device prevents rotation of the tool head relative to the handle where a keyway and key system prevents the rotation.

Abstract: An arrow point with a selectably-adjustable, incrementally-stepped array of weight-regulating elements. The weighting elements are demarked lineal component segments of an elongate rod or bar which is deeply grooved radially at incremental, lineally-spaced positions along its length. The rod is threaded at its forward end for coupling engagement with a threaded neck portion of the arrow point. Prior to sleevedly assembling the arrow point with the shaft of the arrow, the segmental rod is severed at a particular pre-set groove to leave a selectable number of weight segments attached. The latter remain as a secured, weight-adjusting core component of the arrow point assembly. An O-ring seated in a diminutive, outwardly-opening annular groove formed in a sector of the rod forwardly of the segmental array bears upon an enveloping inner wall of the body of the point assembly to stabilize and to lock the rod frictionally within the core of the arrow point.

Abstract: An extension pole for a paint roller or the like. The pole has a threaded neck for engaging interior threads of a handle. An O-ring or neck engages an end of the handle to resist rotation of the pole relative to the hollow handle.

Abstract: A Direct Access Modular Binder containing one or more posts. Each post is comprised of two or more interconnected independent locking modules. These locking modules can easily be inserted or removed to change the length of the post to efficiently accommodate varying amounts of paper. The modules additionally function to permit direct access for insertion/removal of pages or modules anywhere along the post. The modules in the post may contain a telescoping feature. The module(s) containing a telescoping feature are optimally positioned at the end(s) of the post and fixedly attached to the post holding strips. The strips, which hold the posts' ends, may be hingedly attached to the front and back covers. The telescoping feature permits the binder to be automatically compacted (when not in use), for efficient storage, and temporarily expanded (when in use), to provide space for the user to insert/remove paper or modules. The modules which make up the post are easily locked and unlocked.

Abstract: A valve spring housing for use in an adjustable regulating valve device of a railway locomotive brake valve has a cylindrical body with first, second and third sections. The first section has an outer cylindrical surface of a uninterrupted curvature, which first section can be threadedly secured to a valve pin housing, a recess to accept the end of a spiral spring, and a first flange extending radially outwardly therefrom. The second section has a convex surface on the end thereof and a second flange extending radially outwardly therefrom. The intermediate section is disposed between the first and second flanges and seats a sealing member between the flanges. A torquing tool acceptor, such as a transverse passageway is provided on the second section to enable threaded securement of the valve spring housing to a valve pin housing of a valve pin assembly in assembling the adjustable regulating valve device.

Abstract: A drive shaft has a driving end and a driven end and is provided at the driving end with an external helical thread and a cylindrical pilot surface disposed between the thread and the driving end, the pilot surface having a diameter approximately equal to the inner diameter of the thread. During a mounting of an impeller to the drive shaft, a crest flat of an internal helical thread in the impeller rides on the pilot surface. The shaft has an additional pilot surface on the other side of the shaft thread. Upon a mounting of the impeller to the shaft, the two pilot surfaces on the shaft engage two precision impeller hub bores which straddle the threads to provide a controlled close fit of impeller and shaft to one another and to maintain the geometric axes of impeller and shaft true with one another.

Abstract: An improved ceiling fan having lighting fixture comprises mainly a shaft with a fastening end fastened to the ceiling and with a free end of a predetermined length extending downwardly, a main body fastened to the free end of the shaft and provided with a swivel portion, lighting fixtures arranged under the main body, a plurality of fan blades fastened respectively to the swivel portion of the main body and between the lighting fixtures and the ceiling, and a light reflecting apparatus disposed at the upper end of the main body and provided with means to emit light of an intensity capable of projecting on the ceiling from which the ceiling fan is suspended.

Abstract: An improved broom assembly comprises a head member having an integrally threaded handle receiving opening with a handle threadedly connected therein and including a locking adaptor for preventing inadvertent unthreading of the handle from the head member. The locking adaptor comprises a generally cylindrical collet body member formed independently of the head member and the handle and having a central opening through which the handle slidably extends. The collet body member further includes resilient finger portions extending axially from the body member along the handle in a direction away from the head member. A nut member is threadedly received on the collet body member for movement axially thereof and includes a tapered surface engageable with the finger portions for driving the finger portions radially inward into gripping engagement with the handle. Engagement tabs extend axially between the collet body member and the head member for preventing relative rotation therebetween.

Abstract: A threaded joint for coupling two drill rod elements includes a first drill rod element having at least one end thereof a male tapered helical threading with a cone opening angle greater than 1.degree. and less than 3.degree.. The threading has a constant pitch determining an angle of inclination of the decreasing helix as greater than 1.degree. and less than 3.degree. at the beginning of the helical threading. A second drill rod element has corresponding female tapered helical threading. Each tapered helical threading has primary and secondary shoulders on opposite ends thereof and a stand-off between the primary shoulders when the male and female tapered helical threading are manually fitted together. The male tapered helical threading has discharge grooves in an unthreaded zone for deflection of lines of force.

Abstract: The component parts of a drill rod assembly on a blast furnace tap hole drill are joined together by providing a unique threaded coupling in which the threads do not torque tightly against each other but maintain a loose, floating relationship to thereby permit the coupling to be threaded together by hand without the use of a wrench, and such that the drilling action of the percussion drill will maintain the components in a joined relationship.

Abstract: The invention relates to a method for producing mechanical joints of concrete-reinforcing rods, to a reinforcing rod allowing the application of the method as well as to a mechanical joint for reinforcing rods thus produced. It has its applications especially in the construction of concrete elements, buildings or structures.According to the invention, the method for producing the mechanical joints for the reinforcing rods which allow the joining of reinforcing rods, the extremities of which are threaded by screwed connecting sleeves, is characterized in that prior to the threading, the extremity of the rods to be joined is subjected to a cold upsetting procedure.

Abstract: An electric fan motor of a domestic clothes dryer is directly mounted to an associated plastic fan housing through an interlocking connection between a composite mounting ring of the motor and a cylindrical socket integrally formed with the housing to provide a precise alignment between the motor and the housing.

Abstract: A sleeveless screw connection between two reinforcing steel elements includes a conical tapped hole in one end of one of the elements, and a conical externally threaded end on the other element. The surface of each thread envelope makes an angle of between 3.degree. and 10.degree. with the axis of the respective element; the thread pitch is between 1.0 and 2.5 mm, and the thread angle is between 70.degree. and 90.degree..

Abstract: A screw type coupling device includidng a male screw element formed by installing a coil spring form helical component on the outer surface of a columnar element and a female screw element formed by installing a coil spring form helical component in a tubular element so that the two helical components are screw engaged with each other. With the application of such coupling device to an antenna for vehicles, the antenna having the male screw element at the base is removably attached to a vehicle body by screwing the male screw element of the antenna to the female screw element installed in the vehicle body.

Abstract: The threaded connection between a graphite shaft and a metal shaft, such as is used to drive a rotating nozzle in the refining of aluminum, is strengthened by coating the graphite surface that contact the flange portion of the metal shaft prior to the fastening of the shafts together. The coating comprises solid material bonded to the graphite surface to form a hard, adherent coating deposited by coating the graphite surface with a solution or colloidal dispersion of the material and drying said solution or colloidal dispersion to leave the solid material bonded to the graphite surface. The coating of the graphite shaft serves to greatly strengthen the threaded connection and the ability of the connection to transmit driving torque from the metal shaft to the graphite shaft.