Abstract: A work apparatus includes a housing part and a stud bolt for fastening a work tool on the housing part. The stud bolt extends along an axial direction and has a first section and a second section in the axial direction. The first section is at least in part arranged in a receptacle of the housing part. The second section protrudes from the housing part in the axial direction. The first section of the stud bolt in a first lower portion thereof has an outer thread which, for transmitting longitudinal forces (L), threadably engages an inner thread of the receptacle to define a threaded connection. The first section for transmitting transverse forces (Q) to the housing part, in a second lower portion thereof, has a support region supported on the receptacle. The support region is disposed at a spacing (a1) from the threaded connection.

Abstract: A screwable device having a retractable threaded section that has a generally tubular shaft extending along a longitudinal axis and having a front section formed with a radially outwardly open aperture and a rear section. At least one locking element comprising a threaded section and being radially displaceable in the aperture between an outer position with the threaded section projecting radially outward from the shaft and an inner position in which the threaded section is recessed within the tubular shaft. An actuating is rod coaxially slidable in the shaft between a front position and a rear position, the actuating rod having a push-button at its rod rear end, the actuating rod having a structure for engaging the locking element in at least one of its positions pressing the locking element into the outer locking position.

Abstract: A latching mechanism removably attaches an accessory to an offroad vehicle without requiring tools. The latching mechanism includes a body, a shaft extending through the body, and a handle riding on a conical surface of the body for rotating the shaft relative to the body. An oblong head extends on a lower side of the body, rotatable by the handle and shaft to a position where the head extends under a shoulder of a mounting recess. A spring system biases the head axially, such that the head can be moved either upwardly or downwardly from a balanced elevation set by a nut tightenable on a bolt. The mounting recess has an upper portion shaped differently from a lower portion. The body includes a hooking portion which extends significantly above the top of the mounting recess.

Abstract: A spring-loaded fastening system for fastening a liner to a structure, including a spring-loaded fastener with a cleat defining an interior cavity, a spring element disposed on a floor of the interior cavity, and a shoulder bolt with head portion disposed on the spring element, with a shoulder portion of the shoulder bolt extending through a mounting aperture in a floor of the interior cavity and a threaded portion of the shoulder bolt fastened to the structure. The system further includes a hanger pocket in a rear surface of the liner including a first portion with an opening large enough to accommodate a diameter of a lower portion of the cleat and not large enough to accommodate a diameter of an upper portion of the cleat, and a second portion adjoining the first portion with an opening large enough to accommodate the diameter of the upper portion of the cleat.

Abstract: A guide for positioning an orthopaedic guide pin on a bone structure includes a base having an upper face, a lower face intended to bear against the bone structure, and a through-hole for the pin, said guide including several bearing members able to move in guide holes formed in the base, wherein each bearing member has a lower end facing the lower face and is able to be moved selectively between a retracted position inside the guide hole and at least one deployed position in which the bearing member protrudes from the lower face so as to have a salient lower end intended to bear against the bone structure in order to allow the base to be inclined.

Abstract: A vehicle suspension arrangement includes a mounting bracket, a trailing arm, an air spring assembly configured to bias a second end of the trailing arm from a vehicle frame member, an axle assembly couple to the trailing arm, and a trailing arm connection assembly that includes a connector having a first portion received within an aperture of the mounting bracket, and a second portion extending outwardly from the first portion and including an aperture, a bushing member received within a first end of the trailing arm, a pin member received within the bushing member and including a first aperture, and a first mechanical fastener received within the first aperture of the pin member and within the aperture of the second portion of the first connector, thereby pivotably securing the trailing arm to the mounting bracket.

Abstract: Disclosed is an apparatus for use with an instrument handle, the apparatus including a housing, a knob receivable in the housing, the knob having a key hole structure to receive an instrument bulb and neck, a slot in the housing to receive the knob, wherein the knob is pressed into the slot to facilitate installation and removal of the instrument bulb and neck.

Abstract: A fastener which comprises a tubular member, a sleeve, a spring, a shank, and an elongate head. A lower end portion of the shank extends through the tubular member to threadedly engage a lower part. The elongate head rotates within a slot in the upper end of the shank between a first position extending longitudinally of the shank so that it can receive an upper part to be attached to the lower part and a second position extending radially of the shank to prevent removal of the upper part. The shank is received within the sleeve and has a pair of slots in its upper end which are alignable with the shank slot. The sleeve is biased to an upper position by the spring, which is in the tubular member. When the sleeve is in a position wherein it is biased upwardly, the sleeve partially covers the shank slot to prevent rotation of the elongate head between the first and second positions.

Abstract: A lashing pin for engaging a hole in member to facilitate lashing the member to a fixture or vehicle. The lashing pin combines a cam pin sleeve assembly having a flange and sleeve with an eccentric hole formed therethrough with a cam pin assembly having a cam pin passing through the eccentric hole and connecting a cam disk with an eccentrically mounted cam. Rotation of the cam disk with respect to the flange aligns and misaligned the cam with respect to the cam sleeve, thereby enabling insertion through the hole at first position, and retention of the cam against removal at a second position.

Abstract: In broad embodiment, the present invention is a set of sprung pins, operated by paddles, used to facilitate the assembly and disassembly of a firearm. While the foregoing written description of the invention enables one of ordinary skill to make and use what is considered presently to be the best mode thereof, those of ordinary skill will understand and appreciate the existence of variations, combinations, and equivalents of the specific embodiment, method, and examples herein. The invention should therefore not be limited by the above described embodiment, method, and examples, but by all embodiments and methods within the scope and spirit of the invention.

Abstract: A fastening member includes a columnar body and a buckling portion. The columnar body defines a threaded hole along the axial direction of the columnar body and a groove around the external surface of the columnar body along the radial direction of the columnar body. The groove divides the columnar body to a first restriction portion, a second restriction portion and a connection portion. The connection portion is surrounded by the groove. The first restriction portion and the second restriction portion are positioned at two ends of the groove. The buckling portion extends from the first restriction portion away from the first restriction portion. The disclosed subject matter also provides a hard disk fastening apparatus which fastens a hard disk using the fastening member.

Abstract: The invention relates to an assembly unit having an assembly part, which is penetrated by a bore and is to be fastened to a basic structure. The basic structure having a shaft, a head, and a fastener. The fastener having a fastening section on the end thereof facing away from the head, which is held captively and movably in the bore between a first axial position and a second axial position. The assembly unit having a spring, which encompasses the shaft and is formed from a wound spring wire and which holds the fastener captively in the bore. The spring wire is wound in a spiral shape such that the windings thereof do not overlap in the radial direction relative to the spring axis.

Abstract: An orthopedic jig and pins therefore are disclosed that allow the pins to be pre-loaded into apertures through the jig before the jig is positioned at a desired location with respect to a bone during an orthopedic surgical procedure. At least one of the pin and/or jig includes a retention mechanism whereby the pin can be inserted into the bore and releasably restrained therein until the jig is place is the selected position and the pins driven into the bone.

Abstract: An anchor and an attachment base assembly comprises a base having at least one base aperture, and an anchor selectively operatively connected to the base. The anchor is selectively inserted at least partially into the at least one base aperture and optionally into an aperture of an accessory. The anchor has a base part movable between a locked position where the anchor is secured to the base and an unlocked position where the anchor is free from the base. An accessory part is operatively connected to the base part. The accessory part is adapted to selectively connect at least partially to a brim of the aperture of the accessory for bracing at least partially the accessory to the base when the anchor is in the locked position. The anchor has other features. A vehicle having an anchor and an attachment base assembly is also presented.

Abstract: A fixing device for securing into a hole in plasterboard 23, comprising: a body 1 having an anchor receiving aperture 3, and a passage 37a that extends within the body, spaced from the anchor receiving aperture 3; a shaft 5a provided within the passage 37a, the shaft 5a being rotatably movable within the passage 37a, independent of axial movement within the passage 37a; and a retaining member 19a coupled to the shaft 5a and configured to be movable between an extended position, in which the device is retainable in said hole, and a retracted position, in which the fixing device is removably insertable into said hole.

Abstract: A device comprising a shaft and a fastener. The device requires substantially no tools to apply while generally maintaining the basic shape of a common clevis pin and the robustness of a common cotter pin. The fastener passes through a bore hole in the shaft. A cap positions onto a shaft head, and includes a ridge that engages a slot in the shaft head. The cap and head have low profiles and are non-protuberant, so as to minimize snagging, inadvertent release, and/or damage to contacting objects. A plunger positions inside the shaft, passing through a plunger spring. The plunger spring provides a compressive force that presses against the fastener to hold it in place. Removing the cap reduces the compressive force. The shaft cannot be released by external pressure on the shaft head. A compressive element helps secure the fastener in a shaft cross bore.

Abstract: A fastener apparatus is disclosed that features projecting locking members that extend and retract when a central drive shaft is rotated. The exterior of the connector has a body that is partially threaded to receive a nut so that two structures (e.g. flanges, panels, plates, beams, etc.) can be pulled together by tightening the bolt when the locking members are in the extended position. In one embodiment, the shaft can be an eyebolt.

Abstract: A floating fastener includes a mounting base member affixed to a first panel member, a rotary fastening member supported on an elastic member in the mounting base member for locking a second panel member to the first panel member through a rotary motion, and a cap member affixed to the head of the rotary fastening member and axially slidably coupled to the mounting base member and rotatable to shift inside longitudinal ribs relative to vertical guide grooves at a locating flange around the periphery of the mounting base member and to move the rotary fastening member between a locking position and an unlocking position.

Abstract: A device comprising a shaft and a fastener. The device requires substantially no tools to apply while generally maintaining the basic shape of a common clevis pin and the robustness of a common cotter pin. The fastener passes through a bore hole in the shaft. A cap positions onto a shaft head, and includes a ridge that engages a slot in the shaft head. The cap and head have low profiles and are non-protuberant, so as to minimize snagging, inadvertent release, and/or damage to contacting objects. A plunger positions inside the shaft, passing through a plunger spring. The plunger spring provides a compressive force that presses against the fastener to hold it in place. Removing the cap reduces the compressive force. The shaft cannot be released by external pressure on the shaft head. A compressive element helps secure the fastener in a shaft cross bore.

Abstract: A push-in fastener clip assembly includes a fastener having deflectable legs and compression ring for sliding along the deflectable legs during installation, with the compression ring connected to the fastener by frangible connections that are broken as the fastener clip assembly is being installed. Slots in the fastener guide the broken frangible connections during installation of the fastener, limiting rotation of the compression ring.

Abstract: A universal hammerless pin assembly for internally coupling pieces of heavy machinery includes a pin having a cylindrical shank, a head, and a shoulder disposed therebetween along an axis. A cap is moveable between a free condition off the pin and an assembled condition on the head of the pin. In the assembled condition of the cap, a washer is carried on both the pin and the cap. In the assembled condition of the cap, the cap moves between an uncompressed condition and a compressed condition binding the washer on both the pin and the cap. The washer defines an interference coupling the pieces of heavy machinery and preventing relative movement of the pieces.

Abstract: Snap fastener for fastening a first thin wall to a second thin wall, having a base part to be arranged in a through-opening of the first thin wall. A head part extends away from the base part. The head part presents a guide for two holding elements which are pressed by a spring so that they project out over the end of the guide. The head part includes a housing with fastening projections, and can be snapped into the through-opening so that it grips only one thin wall. Unlocking devices, via which the holding elements can be pulled back into the housing from the front, are provided in the housing. The holding elements are formed by the ends of a two-armed lever which is held on a shaft in the housing so as to be rotatable at an angle of approximately 45 to 90 degrees against spring force.

Abstract: An anchoring harpoon intended in particular for an aircraft, capable of cooperating with an anchoring grate of a platform, includes jack elements including a cylinder element containing mobile piston elements provided with a rod that extends beyond the cylinder element, the free end of which includes a harpoon head (7) that is hooked in the grate and includes retaining fingers (8, 13, 14) that can be moved between a retracted position and an active position by control elements (9). The control element (9) for controlling the movements of the fingers include a control piston (18) which can slide inside the rod of the jack and which is associated with a bistable actuator (19) of the fingers, capable of moving between a retracted position and an active position in which the fingers are deployed with the application of successive pressure pulses in the jack elements.

Abstract: A quick assembly apparatus includes a fastening unit, a control unit and an elasticity unit. The fastening unit includes a head section and a fastening section, a through channel connecting the head section and the fastening section, and a notch at the fastening section to form a plurality of elastic fastening elements. The control unit is movably inserted in the through channel, includes a supporting section supporting the elastic fastening elements, a control shaft connected with the supporting section and extending out from the fastening section, and an extension shaft connected with the supporting section and extending towards the head section. The elasticity unit is fitted around the extension shaft of the control unit, and has its one end pushed against the control unit and its another end pushed against the fastening unit. Accordingly, the quick assembly apparatus is capable of quickly and steadily assembling two plates.

Abstract: A fastener has an integral retention mechanism, which is affixed to the fastener without the need for EDM slots along the length of the fastener. The integral retention mechanism reliably secures the fastener to a panel until it is desired to remove the fastener, in which case the fastener may be easily disengaged without any additional tools. The fastener has an axial aperture having an opening in the tip of the fastener, and axially aligned openings along opposing sides of the fastener which penetrate through to the axial aperture. A u-shaped spring mechanism is disposed within the axial aperture, with a portion of each leg outwardly extendable through the axially aligned openings to provide a retention mechanism.

Abstract: The present invention is to provide a fastener for an ornament having a pin which is excellent in workability on assembly and manufacture and improved in yield ratio, and the fastener of the present invention is characterized that the pin of the ornament is clamped in the fastener and retained between the respective spherical surfaces of a plurality of small balls, wherein a column portion inside a housing is provided with an outer column portion of a cylindrical body which is formed integrally with a pin retaining portion in a direction at which the pin retaining portion is pulled backward and internally has a through hole in the same direction as a direction at which the pin is inserted and an inner column portion of a cylindrical body which is inserted and fixed to the through hole inside the outer column portion, formed integrally with the control lever in a direction at which the control lever is urged and also has a through hole acting as a passage for introducing the pin inserted through the pin passin

Abstract: A fastener assembly configured for use within an opening defined in a transition piece bracket is disclosed. The fastener assembly may generally include a fastener having a head configured to be positioned proximal to a first end of the opening and a body. The body may include a shank portion, a threaded portion opposite the shank portion and a recessed portion defined between the shank portion and the threaded portion. The fastener assembly may also include a retention member configured to be positioned within the opening adjacent the recessed portion such that the retention member engages at least one of the shank portion or the threaded portion as the fastener is moved within the opening. In addition, the fastener assembly may include a biasing member engaged against the retention member. The biasing member may be configured to bias the head of the fastener away from the first end of the opening.

Abstract: A screw assembly includes a screw, a spring, and a mounting panel. The screw comprises a head portion and a shaft portion extending from the head portion. The spring comprises a spring body and a securing end extending from the spring body. The spring body defines a surrounding opening. The mounting panel defines a through hole corresponding to the surrounding opening. The mounting panel comprises a positioning portion. The shaft portion is located in the surrounding opening and the through hole. The spring is located between the head portion and the mounting panel. The positioning portion is configured to resist the securing end to prevent the spring from rotating.

Abstract: A push-in fastener assembly includes a fastener having deflectable retainer wings and a guide ring slidable over the retainer wings. The retainer wings and/or the guide ring are shaped to reduce interference of the guide ring sliding over the retainer wings when distorted by the retainer wings. Structure is provided for more secure preassembly of the guide ring on the fastener.

Abstract: A clip is provided which can flexibly deal with a change in thickness of a member in which a mounting hole is formed so as to be stably fixed in the mounting hole without any looseness. This clip 10 includes a grommet 20 and a pin 40. The pin 40 has a head portion 41, a shaft portion 43 which projects from one side of the head portion 41, first locking pieces 50 which are provided flexibly on an outer circumference of the shaft portion 43 so as to be brought into engagement with a circumferential edge of the mounting hole 3 and first engagement portions 50 which are brought into engagement with the grommet 20 so as to prevent the dislodgement of the pin 40.

Abstract: A mechanism for attaching a structure to a relatively flat panel includes a housing containing an outer button which contains an inner button. Displacement of the inner button into the outer button causes a moveable attachment portion to partially collapse toward a centerline which permits the moveable attachment portion to pass through an engagement aperture in the panel. Movement of the outer button into the housing permits the moveable engagement portion to extend past a back surface of the panel to engage the back surface and hold the attaching structure to the panel via forces exerted by biasing members once the buttons are released.

Abstract: A fastener includes a bolt, a ring engaged around the bolt, and a coil spring. The bolt includes a head, a threaded engaging portion, a shaft portion between the head and the threaded engaging portion, and a bottom flange extending radially and outwards from an end of the shaft portion connecting the threaded engaging portion. The shaft portion includes a main part connecting the head, a tail part connecting the bottom flange, and a guiding part connecting the main part and the tail part. A diameter of tail part is smaller than a diameter of the main part. A diameter of the guiding part increases from the tail part to the main part along an axial direction of the bolt. The coil spring coils the shaft portion and is sandwiched between the head of the bolt and the ring.

Abstract: Arrangement for coupling first component and a second component exhibiting thermal expansion. The shank of a fastener extends through the first opening of a flattened first spacer, a spring opening of a spring element, and a second opening of a second spacer element, and is fixedly secured to the first component. The second spacer is disposed within a channel in the second component. The first spacer is disposed subjacent a head of the fastener, and the spring element is disposed between the first spacer and an abutment surface of the second component.

Abstract: The present invention is a locking pin that takes advantage of a simpler manufacturing process, fewer parts to effectively lock the pin onto an object. The locking pin is in one embodiment for fastening an object by means of an object hole of a predetermined object hole diameter to the pin. The pin comprises an elongated shaft having a forward end and a rearward end with a pinhead at the rearward end. A pair of laterally opposed notches formed at a predetermined location along the length of the shaft. The portion of the shaft between the pair of laterally opposed notches is defined for reference purpose as the lock base. A forward hole and at least one rearward hole that extends through the lock base proximal to the forward end of the lock base. A wire lock is made of a spring-biased wire that is bendable upon compression and returns to its original shape. The wire lock is received into the forward hole and rearward hole.

Abstract: A winged wall anchor having wings pivotally connected with a rivet and spring biased to an open position. The wings pivot about the rivet axis so that they can open parallel to the wall which allows the wings to open even when they are adjacent an obstacle and requires substantially less backspace.

Abstract: A snap fastener, for fastening a first thin wall to a second wall, has a base part and a head part extending away from this base part The head part presents a guide/channel for one or more push/holding elements. The ends of the push/holding elements project out of the guide/channel. The head part is provided as a housing with fastening projections. The housing can be snapped into through-openings in the first and second walls such that it grips only one wall. Unlocking devices are provided in the housing, which can pull the push elements back into the housing from the front, and which can disengage the housing from the other thin wall. According to the invention, a compression spring extending between the support plane of the base part and the associated edge plane of the thin wall (front panel) is arranged on the support plane of the base part.

Abstract: An exemplary securing structure includes a base, a fastener, and a spring mounted around the fastener. The base defines a through hole, and two slots located adjacent to and communicating with the securing hole. Two barriers are formed at a bottom of the base corresponding to the slots. A gap is defined between the bottom surface and each of the barriers. The fastener includes a head, a bolt, and two blocks extending outwardly from a periphery of the bolt corresponding to the slots, respectively. When the bolt is extended through the securing hole with the blocks extending through the slots until the blocks are received in the gaps, the fastener is then rotatable to cause the block to escape from the gap and abut on the bottom surface of the base, with the spring resiliently compressed between the head of the fastener and a top side of the base.

Abstract: A locking screw for connecting two or more articles together is provided. The screw includes an externally threaded shaft, a head, and an elastic member. The head defines a chamber in which a spiral groove is defined. The shaft extends from the bottom of the chamber; and the elastic member is arranged around the shaft and one end of the elastic member is received in the spiral groove of the chamber and another end abuts against an article. The elastic member can be rotated around the longitudinal axis of the shaft, to change the length of the elastic member, so that enough tension is created to ensure locking the screw in place and prevent any rotation, thus maintain a tight engagement among the articles.

Abstract: A fastening assembly includes a fastening member, a locking member engaged with the fastening member, and an elastic member sleeved on the fastening member. The fastening member forms an arc resisting sidewall. The elastic member includes a main body and a plurality of elastic strips extending from a same side of the main body and spaced from each other. Each elastic strip gradually closes to an center axis of the main body along the direction of away from the main body. Each elastic strip forms an arc protrusion towards the center axis of the main body on an inner wall. The arc protrusion matches with the resisting sidewall.

Abstract: A fastener assembly includes a bushing having a flange configured to be urged toward a work-piece, and an isolation spring configured to be positioned between the flange and the work-piece. The isolation spring includes a metal core integrally formed with a rubber coating.

Abstract: A fastener apparatus is disclosed that features projecting locking members that extend and retract when a central drive shaft is rotated. The exterior of the connector has a body that is partially threaded to receive a nut so that two structures (eg. flanges, panels, plates, beams, etc.) can be pulled together by tightening the bolt when the locking members are in the extended position. In one embodiment, the shaft can be an eyebolt.

Abstract: An exemplary locking assembly includes a locking member and a sleeve. The locking member includes a locking portion, a neck portion, and a head portion. One end of the neck portion is connected to the head portion, and another end of the neck portion is connected to the locking portion. An outer diameter of the locking portion is larger than that of the neck portion. An outer diameter of the locking portion is larger than that of the neck portion. The sleeve defines a through hole therein for holding and guiding the locking member. The through hole includes a first part. The sleeve further includes a restricting portion extending out from an inner surface of the through hole adjoining the first part of the through hole. After locking portion of the locking member passes through the restricting portion of the sleeve, the restricting portion blocks the locking portion from sliding out of the sleeve.

Abstract: A screw assembly includes a screw, a spring, and a mounting panel. The screw comprises a head portion and a shaft portion extending from the head portion. The spring comprises a spring body and a securing end extending from the spring body. The spring body defines a surrounding opening. The mounting panel defines a through hole corresponding to the surrounding opening. The mounting panel comprises a positioning portion. The shaft portion is located in the surrounding opening and the through hole. The spring is located between the head portion and the mounting panel. The positioning portion is configured to resist the securing end to prevent the spring from rotating.

Abstract: A fastener includes a bolt, a ring engaged around the bolt, and a coil spring. The bolt includes a head, a threaded engaging portion, a shaft portion between the head and the threaded engaging portion, and a bottom flange extending radially and outwards from an end of the shaft portion connecting the threaded engaging portion. The shaft portion includes a main part connecting the head, a tail part connecting the bottom flange, and a guiding part connecting the main part and the tail part. A diameter of tail part is smaller than a diameter of the main part. A diameter of the guiding part increases from the tail part to the main part along an axial direction of the bolt. The coil spring coils the shaft portion and is sandwiched between the head of the bolt and the ring.

Abstract: A fastener for fixing heat dissipation devices includes a shaft, a cap and an elastic member. The shaft includes a first end, an opposite second end, and a flange between the first and second ends. The cap is detachably engaged with the second end of the shaft. The elastic member partly encloses the shaft, and is retained between the flange and the cap. A heat dissipation device matching with the fastener is also provided.

Abstract: A fastener device for fastening two or more objects together, and more particularly a fastener device of the type that incorporates a pin having an undulating section and a corresponding mating housing having a resilient biasing member for fixing the mating housing along a desired position on the pin. The mating housing can be caused to permanently lock onto the pin or can be removable from the pin.

Abstract: A hitch system includes a handle portion including a handle loop, a pin portion extending from the handle portion, a pair of opposite retainers and a trigger. The retainers are movable between a retracted position relative to the pin portion and an extended position relative to the pin portion. The trigger is coupled to the retainers to actuate the retainers between the retracted position and the extended position.

Abstract: A push-in fastener assembly includes a fastener having deflectable retainer wings and a guide ring slidable over the retainer wings. The retainer wings and/or the guide ring are shaped to reduce interference of the guide ring sliding over the retainer wings when distorted by the retainer wings. Structure is provided for more secure preassembly of the guide ring on the fastener.

Abstract: Captive panel fasteners are configured to be held captive on a panel by multiple retaining elements. The fasteners include longitudinal grooves along a cylindrical portion of the fastener, a retaining ring over the cylindrical portion, a primary structure for retaining the retaining ring on the cylindrical portion, and secondary structure for retaining the cylindrical portion within a bore of the panel. The retaining ring includes radially inwardly extending opposing prongs that fit into the longitudinally extending grooves. A stop point may be provided in the longitudinally extending grooves, or an end of the fastener may be flared, to retain the retaining ring on the fastener. The prongs may also be slightly flexible and flared to grip the longitudinally extending grooves. The secondary structure can include one or more spring loaded pins in the fastener extending externally outward.

Abstract: A fastener includes a post, a first and a second threaded portions extending from opposite ends of the post, a head portion extending from the first threaded portion opposite to the second threaded portion, a spring fitting about the post, and a nut screwed to the first threaded portion.