Abstract: On the passenger side of a motor vehicle an air bag module is inserted in the instrument panel and is connected with a support stationarily disposed behind the aperture by holding plates, where at the upper holding plate at least one mounting bolt is disposed, which is engaged in a corresponding through hole of the support, and the mounting bolt has a recess and is coated with a plastic layer.

Abstract: A screw head cap having a cap portion, a washer portion, a skirt portion turned down from a capping main body portion and an upstand portion turned up from the washer portion. The inner periphery of the skirt portion is inwardly turned down at an angle ranging from eighty to eighty-five degrees to a horizontal plant of the cap portion, while the outer periphery of the upstand portion is outwardly turned up from a base portion thereof at an angle ranging from eighty to eighty-five degrees to a horizontal plane of the washer portion, corresponding to the inwardly turned down angle of the inner periphery of the skirt portion. The thickness of the capping main body potion is nearly homogeneous and is proportional to 0.7 to 0.95 of the maximum thickness of the skirt portion.

Abstract: A releasably mountable cleanout cover for releasable mounting onto a plumbing cleanout cap, having a protruding cap member, exposed within an aperture in a wall includes an aperture covering member having an exterior surface and an interior surface for covering the aperture in the wait, a hollow mounting tube rigidly mounted to and generally centered on, the interior surface and extending longitudinally and generally perpendicularly outwardly from the interior surface, a longitudinally spaced apart array of opposed inwardly extending resilient flanges spaced longitudinally apart within the hollow mounting tube for resilient deformation about opposed surfaces on the protruding cap member when the protruding cap member is snugly journalled in the hollow mounting tube so as to be snugly retained between the opposed inwardly extending resilient flanges.

Abstract: A safety lock device when combined with at least one pair of spaced screw fasteners, which by observation indicates tightness of the fasteners or looseness of either or both fastener, and additionally to limit counter rotation of either fastener to a small faction of a turn, characterized by a pair of replaceable caps anchored to each fastener, and a loose lanyard extending between the caps when the fasteners are in tightened condition, also any multiplicity of caps tethered by lanyards.

Abstract: A flush mounted panel fastener is provided for use in aircraft or the like of the so-called stealth type designed to avoid detection by radar. The panel fastener comprises a fastener element such as a threaded bolt having a head and shank for fastening a panel onto a substrate or frame. The head is sized for recessed seating within a counterbore formed in the panel, and a fastener cap is mounted and magnetically retained on the head of the fastener element. The fastener cap has a surface coating or finish thereon disposed substantially coplanar with an outer surface of the panel, wherein the surface coating is formed from a suitable nonreflective radar material and cooperates with the panel to present a substantially uninterrupted surface of low radar signature.

Abstract: A fastener cage for retaining a fastener on a panel comprises a retainer and a collar which sandwich a rigid substrate of the panel and snap-fit together in interconnecting relationship through a hole in the substrate. The retainer retains an anchoring end of the fastener and the collar and the retainer transmit pushing and pulling forces on the panel substrate through extensive areas of the respective inner and outer side of the substrate surrounding the hole. The retainer and collar are formed with a central opening for the insertion of the fastener and a thin inexpensive cover is adhered to the retainer to close the opening therein to prevent the entry of plastic foam that is formed against the inner side of the panel substrate.

Abstract: A socket end closure arrangement comprises a socket 4 in an article 5 and a closure 1 for the socket end. The closure 1 comprises a plug 2 for fitting into the socket 4, and to which plug 2 is attached, preferably tangentially, a disc-like flange 3. The plug 2 has spherically-arranged surfaces having a curvature substantially derived from the surface of a sphere and permitting selection of the orientation of the plug in fitting of the plug 2, preferably in interference-fit manner, into the socket 4 from a plurality of alternative orientations about at least one axis transverse to the longitudinal axis y of the socket 4. The flange 3 preferably locates into a surface recess 7 to become flush with the surface of the article 5. The plug may be physically structured in providing resilience and accordingly may be segmented 24. The axis y may be non-perpendicular to the plane of, or tangent to, the article surface, and the axis x of the recess 7 may not be aligned with axis y.

Abstract: An electrical terminal washer (40) includes a substantially flat contact wall (42) having an aperture (44) therein and four curved wall portions (48-54) depending from the contact wall (42) and forming an internal cavity (58) within the washer (40). Two opposing wall portions (48,52) have curved engagement ribs (28) disposed within the internal cavity. A stud (10) includes a connection end (12) which extends through the aperture (44) in the washer (40) and a hexagonal tightening portion (22) receivable within the internal cavity. The length of each rib (28) is greater than the length of each surface of the tightening portion (22) to enable the washer (40) to rotate on the stud (10) and to avoid the need for indexing the washer (40) on the stud (10) during assembly.

Abstract: A fastening device for anchoring a sealing strip on a roof includes an elongated fastener which penetrates both a holder and the sealing strip and has a drill tip at a lower end thereof extending into the roof substructure. An opposite upper end of the fastener has an enlarged upper end engaged in an opening in the holder to press the holder against and anchor the sealing strip on the roof. A cover having a recessed underside for receiving the holder and a central hole with a slit-like depression for receiving a catch-shaped projection extending upwardly from the head of the fastener is rotated to drive the fastener and the holder into position on the sealing strip while at the same time covering the opening in the holder to prevent entry of rainwater and the like. As the cover engages the sealing strip, the cover eventually disengages the fastener so that only the cover rotates.

Abstract: A screw connection includes a first component having an outer surface and a countersunk bore extending from the surface and having a cylindrical portion adjoining the outer surface of the first component. There is further provided a second component adjoining the first component. A screw passes through the countersunk bore and extends into the second component for joining together the first and second components. The screw includes a screw head having an end face which is recessed relative to the outer surface. A disk is press-fitted into the cylindrical portion of the countersunk bore. The disk has a surface oriented toward the end face of the screw head. The disk surface has a center part which is in direct or indirect contact with the end face of the screw head. A circumferential marginal part of the disk is at a clearance from the end face of the screw head whereby an externally applied pressing force on the disk at a disk location spaced from the center part causes a rocking motion of the disk.

Abstract: A bolt assembly includes a knob having an aperture formed in a hub. The hub includes three ears extended radially outward. A bolt is engaged in the aperture and includes a head engaged in the hub. A cap includes three flanges extended radially inward for engaging with the ears so as to secure the cap to the knob. A spring is engaged between the cap and the head of the bolt for biasing the head of the bolt to engage with the hub. The knob and the bolt may be easily changed when the cap is disengaged from the hub. An element is engaged in the hub for engaging with a smaller bolt.

Abstract: A fastening device is provided to secure a sagging headliner to the interior roof portion of a motor vehicle. The device consists essentially of an upholstery type button which has been modified by attaching thereto a V-shaped member made from spring steel wire. The device is installed in the ceiling of the vehicle by squeezing the two prongs of the V-shaped member into a sharp point, and then pushing the point through the headliner and into a cardboard backing. When the button has been fully pushed in, the prongs of the V-shaped member will spread apart under the force of the flexed steel, and thereby hold the button, and the headliner, up against the roof of the car.

Abstract: A protective waterproof cover assembly includes a a truncated-conical dome-shaped rigid cover adapted to overlie a fastener installed through a surface of a support structure and provide sufficient clearance between the cover and the surface to permit loosening of the fastener and movement of a head of the fastener away from the surface, a flexible waterproof circular pad having a diameter which is greater than that of the cover adapting the pad to overlie the cover such that an outer annular portion of the pad extends beyond a perimeter of the cover and overlies an annular portion of the surface of the support structure which surrounds the cover, and a layer of adhesive applied to a bottom face of the pad for adhering the pad to the cover and to the annular portion of the support structure surface. A peelable backing sheet is applied to the adhesive layer.

Abstract: A two-piece lug bolt including a shank having first and second end portions and a central portion there-between, a thread on the first end portion, a first flange of larger diameter than both the first and second end portions located on the central portion of the shank, a head, a first wrench-receiving portion on the head for receiving a wrench, a bore in the head for receiving the second end portion of the shank with a press-fit, a second flange on the head which is of larger diameter than the wrench-receiving portion and substantially the same diameter as the first flange and located in contiguous relationship to the first flange and in bearing relationship therewith, and a second wrench-receiving portion on the shank located between the first flange and the second end portion of the shank and positioned within the head.

Abstract: An automotive drum brake assembly includes first and second brake shoes mounted on a backing plate. A wheel cylinder for braking actuation is mounted between the brake shoes. An adjuster screw assembly is held between the brake shoes by an adjuster spring. The adjuster screw assembly includes a pivot nut threaded onto an adjuster screw. In one embodiment, a sleeve includes a first portion slidably mounted on the pivot nut, a second ramp portion covering the screw threads and a third portion opposite the pivot nut. The second portion, preferably formed as a frustoconical ramp, is slid by the adjuster spring to travel with the adjuster screw as it unthreads from the pivot nut, thereby shielding threads from corrosive elements.

Abstract: A high voltage contact assembly comprising two dielectric housing members adapted for fastening together, the first dielectric housing member having a first conductor inserted therein, the second dielectric housing member having a second conductor inserted therein and spring means sandwiched between the first conductor and the second conductor, the second conductor fastened to a high voltage cable member, such that, when the dielectric housing members are fastened together, the first conductor member extends above the surface of the first housing member. The contact assembly of the invention is useful for mounting in a base plate support for an electrostatic chuck in an etch chamber.

Abstract: A plug locking assembly for installation in an aircraft panel or the like. The plug assembly is coupled to a receptacle mounted in a recess in the panel. A spring biased detent locking mechanism is reciprocally mounted in the plug assembly movable from a first position wherein the detents of the detent locking mechanism are trapped in the plug assembly to a second position wherein the detents lock the plug assembly within a chamber in the receptacle. The upper surface of the plug assembly is flush with the upper surface of the panel and can be unlocked automatically therefrom.

Abstract: A two-piece lug bolt including a shank having first and second end portions and a central portion therebetween, a thread on the first end portion, a first flange of larger diameter than both the first and second end portions located on the central portion of the shank, a head, a wrench-receiving portion on the head for receiving a wrench, a bore in the head for receiving the second end portion of the shank with a press-fit and a second flange on the head which is of larger diameter than the wrench-receiving portion and substantially the same diameter as the first flange located in contiguous relationship to the first flange and in bearing relationship therewith.

Abstract: A capped wheel nut formed of a cap and a nut insert which, when engaged, rotate together such as for removably engaging a wheel to a threaded stud of a hub of a vehicle. The capped wheel nut is rotated by a standard tool which applies a rotational force to the cap. Should the cap become disengaged from the nut insert, then the nut insert may be rotated by a standard tool which applies a rotational force to the nut insert in the absence of the cap.

Abstract: A wheel suspending device for a vehicle has a plurality of leaf springs disposed inside of a rim of the wheel. Each of the leaf springs is a chord member, two extremities of which are supported by the rim member, and a central portion of which is supported by an axle. The axle is inserted in a sleeve, which is fixed to the axle by a nut screwed on an end portion of the axle. A protrusion formed at a center of an inner surface of a cap linked with the nut is inserted in a hole formed in an end surface of the axle.

Abstract: The tamper proof anchor bolt assembly includes a frangible nut assembly and a tamper resistant skirt attached to one end of an expandable anchor bolt device. An expandable anchoring means attached to the other end of the anchoring device expands to create a secure connection between the anchor bolt and a supporting structure in response to the application of torque to the frangible nut assembly. The frangible nut assembly includes a frangible connection which ruptures at a predetermined torque corresponding to the secure connection. The tamper resistant skirt is rotatably positioned around the entire periphery of the remaining frangible nut assembly to prevent a tool from upsetting the secure connection by applying a gripping force to the anchor bolt device.

Abstract: A rail mounting hole cap for closing a rail mounting hole formed in an upper surface of a guide rail of a linear guide device. The cap comprises a cap body and an elastic covering member. The cap body includes a cylindrical barrel portion having axial slits, a projection formed on an outer periphery of the barrel portion at a lower end thereof, and a cap lid part of which is reduced in thickness. The elastic covering member covers the lid portion of the cap body and is greater in outer diameter than the cap body.

Abstract: A tamper proof protective cover for cap screws. The cover is installed over either the head or nut, depending which is exposed to vandalism. There is a hemispherical or dome shaped surface with a slightly angled bottom to prevent getting a grip on the cover. A blind bore with a compression ring and gripping rings extending from the flat bottom surface into the blind bore. The protective cover is installed using a special tool by placing the bore over the head or nut of a cap screw and driving down on the head or nut. The gripping rings engage and either binds with or penetrates the edges of the head or nut.

Abstract: A one-piece plastic body has a central cavity of hexagonal cross section for receiving the hexagonal rotatable end portion of a standard screw connector of a coaxial cable. When inserted into the central cavity, the connector is snugly retained between a bottom flange or stop and upper inward-projecting lips. The attachment includes wings projecting oppositely from the attachment body and extending rearward along the coaxial cable for convenient grasping by a user.

Abstract: A structure for preventing from readjusting an adjustment member, which adjusts an extent of operation by rotating the adjustment member, and more particularly, for preventing from readjusting an adjustment member in a carburetor. The structure for the adjustment member includes a hollow tube of a heat shrinkable resin to be fitted around the outer surface of a rotating operational portion of the adjustment member in such a manner that when the hollow tube is heated to be shrunk, it is securely fixed around the outer surface of the adjustment operational portion. Owing to such an arrangement, it will be impossible to fit a tool or the like onto the adjustment operational portion of the adjustment member once it has been available to the user, thus preventing the readjustment. Even if it is readjusted, the readjustment will be easily recognized during a particular inspection of performance.

Abstract: A protective cap for wheel nuts of a truck or other vehicle comprises a hollow thimble of rubber or like material having a pad containing at the closed end of the thimble.

Abstract: A plastic accessory having a retaining socket for use with socket head cap screws, the plastic accessory engagingly receiving the head of the screw and having a hub concentrically positioned within the retaining socket and co-axial with the socket. The retaining socket of the plastic accessory is shaped to allow for engagement with the socket head cap screw and the hub of the plastic accessory extends into the socket of the head in the screw. The upper body portion of the hub, upon engagement with the screw, is both sheared and reshaped to a configuration corresponding to that of the head socket of the screw. A plurality of primary grips and a plurality of secondary grips are positioned on the inside wall of the retaining socket of the plastic accessory for absorbing the screw head tolerance and gripping the peripheral surface of the head of the screw. The screw head is resiliently received by deforming, shearing and press fitting the retaining socket of the plastic accessory.

Abstract: A screw with an anti-theft safety head is suggested, which safety head is provided with a bore receiving a substantially cylindrically constructed tool extension part originating at the screw. At least two rotatably supported pins are arranged substantially parallel next to the bore in the anti-theft safety head, which pins are each rotationally fixed to a locking member. The locking members can be swung into an annular groove on the tool extension part by rotating the associated pin from its upper end, which upper end is accessible from outside and is constructed as an adjusting tool adapter segment. Only when all pins and locking members assume a very precisely defined position, it is possible to pull off the anti-theft safety head. The solid construction of the anti-theft safety head provides a novel anti-theft protection of the screw.

Abstract: A fastening combination adapted for quickly and efficiently connecting a first structure to a second structure using a single tool (like a screwdriver) and from just one side of the two structures. The fastening combination (which may be called a "blind" fastener) is particularly useful in the aircraft industry for installing a transparency such as a canopy or window to the airframe of some plane. A transparency may be removably connected to the airframe with a plurality of internally threaded members (or sleeves) and mating fastening bolts. The sleeves are loosely mounted in a plurality of fastener housings that can be permanently installed near an edge of the transparency. A means is provided for achieving a mechanical connection between each sleeve and an associated housing in such a way that torque applied by the fastening bolt to the sleeve will be resisted by the housing--and in turn by the transparency (or any other mounting structure to which the housing is anchored).

Abstract: A decorative capped wheel nut for holding a wheel on a motor vehicle where the capped wheel nut is exposed to view and to the enviroment. The nut has first and second ends, the first end to engage the wheel of the automobile, and a circumferential edge intermediate the first and second ends. The cap includes a side section to cover the sides of the nut insert and a top section, joined to the side section, to cover the second end of the nut insert. The opposite end of the side section terminates in a free edge, flare or flange which contacts the circumferential edge of the nut insert. The cap and nut inset are welded together at the contact between the circumferential edge of the nut insert and the free edge of the cap.

Abstract: A two-piece fastener system for installing roofing insulation. The fastener system includes a round disk having a hub extending outwardly from the center of one side. The outwardly extending end of the hub includes an opening adapted to accommodate a threaded fastener or nail. A thermally insulating plug is driven into the cavity through an opening at its opposite end to abut against a head of the fastener, preventing it from backing out. In one embodiment, the plug is retained by a lip that extends thereabove, and in a second embodiment, is retained by engagement of a ridge in a corresponding groove.

Abstract: A fastener assembly for joining a panel to a sub-panel comprising a receptacle assembly having a threaded stud secured to the undersurface of the sub-panel. The assembly includes a bolt having an enlarged head at one end and a nose at the other end. The panel has a countersunk opening aligned with an opening in the sub-panel. The bolt is threaded for threaded engagement to the stud. The head of the bolt has a countersunk opening configured to a tool for rotating the same. This opening includes a releasable plug which is moved downwardly upon insertion of the tool to permit rotation thereof, then returns to a position flush with the exterior of the head of the bolt surrounding the opening.

Abstract: A nut, threaded onto the end portion of a bolt receives a cup shaped cover having an internal radial groove receiving an O-ring therein. The O-ring frictionally holds the cover on the nut. The nut is octagonal, hexagonal or square.

Abstract: A decorative capped wheel nut for holding a wheel on a motor vehicle where the capped wheel nut is exposed to view and to the environment. The nut has first and second ends, the first end to engage the wheel of the automobile, and a circumferential edge intermediate the first and second ends. The cap includes a side section to cover the sides of the nut insert and a top section, joined to the side section, to cover the second end of the nut insert. The opposite end of the side section terminates in a free edge, flare or flange which contacts the circumferential edge of the nut insert. The cap and nut insert are welded together at the contact between the circumferential edge of the nut insert and the free edge of the cap.

Abstract: The invention relates to a safety device for disc brakes. The purpose of the device is to prevent the accidental disassembly of a column forming part of a sliding-caliper disc brake. A cap 51 is rotatably coupled with the head of a bolt 48 forming part of the column and screwed onto a stationary support. The cap has a skirt 59 with a cutout 60 in the shape of an arc of a circle, bounded by stops 50, 50'. In the case of accidental unscrewing of the bolt, one of the stops 50, 50' comes to rest against a stationary part 24 of the brake to prevent further unscrewing. Application to the braking of motor vehicles.

Abstract: A freeze safe valve has a valve body, a valve gate, a washer, a fastener having an interior channel, and a plug placed in the channel of the fastener. With fluid pressure in the normal downstream direction, the plug will be held in place, and the valve will function as a standard valve. However, when net pressure exists in the upstream direction at a certain predetermined level due to, for example, the formation of ice on the downstream side of the valve, the plug will become dislodged so that fluid may flow back to the upstream side. This will alleviate the pressure on the downstream side and ideally will preclude breakage of the downstream pipe or the valve itself.

Abstract: A supporting bush designed to define a connecting seat for a known type of panel fastener on a motor vehicle interior cover panel composed of a base panel and a foam portion; the aforementioned bush being composed of a first cup-shaped element, designed to be gripped in fluidtight manner between the foam portion and the base panel; a second cup-shaped element, designed to click on to the first so as to define with the same an inner cavity for receiving the head on the panel fastener; and a break-off tab for protecting a sleeve portion on the second cup-shaped element, through which sleeve portion access is permitted to the aforementioned inner cavity.

Abstract: The invention relates to a sealed housing for a bolt, including a nut body in threaded engagement with the bolt, and a housing which encloses the nut body. A lock cylinder locks the housing to an anchoring shoulder in the nut body. An elastomeric O-ring is disposed between a circumferential groove in the nut body and a gland bore in the housing.

Abstract: A nut in combination with a deformable plastic plug is provided so as to produce a torsional reistance when the nut is screwed onto a similar male thread such as a bolt. The plug comprises an inner core wedge and an outer sleeve which will expand upon insertion of the core. The sleeve is placed into the nut, leaving at least one complete turn of the thread free, and the core is wedged into the sleeve forcing it to deform into the thread.

Abstract: A cover for covering closure plugs and openings and the like comprises a generally circular plate with axially positioned and extending latching fingers for engaging the corners of intersecting walls of a tool cross slot upon rotation of the cover for releasably retaining the cover in place over the plug.

Abstract: A wheel spoke adjuster guard for protecting wheel spokes, wheel spoke adjuster lugs, and the wheel rim openings through which the adjuster lugs are recieved, of motorcycles, bicycles and the like, from the intrusion of foreign materials. The spoke adjuster guard comprises a plurality of semi-tubular sections adapted for lockable engagement to wrap around and closely surround the spoke adjuster lug and a portion of the adjacent wheel spoke, including the threaded end receivable in the spoke adjuster lug. Upon lockable engagement, the sections also engage the spoke so as to remain fixedly in place to protectively cover the spoke adjuster lug, the threaded end of the spoke, and the wheel rim opening receiving the spoke adjuster lug.

Abstract: In the preferred and illustrated embodiment, a protective anti-theft device for installation on a fireplug is shown. In the preferred and illustrated embodiment, a nut suitable for installation on a fireplug is provided, the nut having an external groove to receive a snap ring therein. A sleeve is joined to the nut by means of a cooperative groove receiving the snap ring therein. This enables the sleeve to free wheel around the nut. The free wheeling sleeve prevents theft and pilferage of the nut once it is installed on a fireplug at the top end to support the stem in the fireplug.

Abstract: A holddown to be used in conjunction with a headed fastener, a roofing system and a method utilizing the same. The holddown comprises a disc-shaped spring and a body encasing the spring. The fastener is interpositionable within a hole in the body of the holddown and displacement of the fastener applies a compressive force to the holddown. The spring is deformable from an unbiased position to a biased postion by the compressive force. The body is deformable from an unconstrained shape to a constrained shape by the deformation of the spring. The holddown is usable in conjunction with both the fastener and pliant filler to affix roofing material in a watertight relationship to a roof structure and to maintain the same in position against the forces applied by the wind.

Abstract: A signboard of a type used to carry replaceable letters or similar indicia can be improved by using at least one easily operated holder to connect the signboard to a support such as a wall. This permits the signboard to be easily removed from the support so that it can be held in a convenient manner as the content of a sign on the signboard is changed or altered.

Abstract: A lug attachment for detecting the removal of a wheel comprising a frangible shroud and an internally threaded member for attaching said shroud to the lug of a wheel mounting plate. The threaded member comprises a pair of split sleeve sections that laterally flex for engagement with the threads of a lug by an axial thrust. Thereafter, an axial thrust of said shroud clamps and secures the threaded member onto the lugs. Means formed on said shroud retains the threaded member in its axial position of attachment to a lug and prevents removal except by breakage.

Abstract: A roof membrane anchoring system is provided of the non-penetrating type, including a base member with an enlarged head carried by an upstanding stem, a disc, and a socket cap which includes a top, depending legs, and feet carried at the bottoms of the legs, the cap being of somewhat resilient material. A clamp is provided for constricting the legs after the socket cap is placed over the head. When uplift forces on the membrane act to deform the disc, it acts against surfaces of the feet of the socket cap, to urge the feet together, thereby providing greater security of the socket cap during periods of high wind velocity. The base member has a passage for insertion therethrough of a fastener, the passage including a quantity of self-curing adhesive material which is cured after insertion of the linear fastener, the adhesive material serving to adhere the linear fastener either to the base member or to a holding element for the linear fastener, or both.

Abstract: A fastener (36,58) attaches a composite material external skin (2) of an aircraft structure to another structure (4). Fastener (36,58) has a metallic head (44,62) and shaft (38,60) and a dielectric cap (50,70) covering a top portion of head (44,62). Head (44,62) and cap (50,70) are received into a countersink hole (6) in skin (2). Cap (50,70) is resilient and fills gap (16) between the top portion of head (44,62) and the inner sidewalls of hole (6). Cap (50,70) forms, with skin (2), an aerodynamic surface which is sufficiently continuous to receive and maintain a crack-free coat of paint having a uniform thickness. The top (52) of cap (50) of internally wrenching fastener (36) is an integral layer of uniform thickness. The top (72) of cap (70) of fastener (58) includes a uniform layer covering the head's top surface around a tool receiving recess (66) and a body of material (74) filling recess (66) and positioned therein after structures (2,4) are attached.

Abstract: A device for assembly with a bolt or screw upon installation thereof to prevent tampering therewith, including a jacket member for encircling the enlarged fastener head with a collar portion for disposition adjacent its underside to clamp the jacket member in place upon tightening of the fastener and a cap member configured to fit within the jacket member to enclose the fastener head therewithin. A rounded annular channel is formed within the anterior wall of the jacket member and a square annular rib is formed on the outer surface of the cap member to provide a snap-tight interference fit therebetween. The interior jacket wall and the outer cap surface are also tapered at slightly differing angles to provide a supplementary interference friction fit. The snap-fit between the jacket and cap members is sufficiently strong that they cannot be separated using conventional tools without damaging or destroying the members. A special tool is provided for authorized separation of the jacket and cap members.

Abstract: A tamper-proof or security threaded fastener assembly adapted for use with standard size bolts and screws is provided to reduce or eliminate the unauthorized removal of threaded fasteners from their desired position of fixation. A cap portion is adapted to completely encase the head of the bolt or screw such that, after tightening of the bolt or screw, access thereto is restricted to a special non-standard tool. In one embodiment, a nut portion is provided comprising an elongate strip provided with a threaded hole to receive the bolt and a perpendicularly disposed flange. An additional hole appropriately provided in the base or plate through which the bolt is attached is adapted to receive the flange of the nut portion in a manner which prevents the nut portion from being rotated after the bolt is tightened and fully drawn up to the base or plate.

Abstract: A two piece, resilient plastic assembly for decoratively covering the head of an installed fastener such as a screw or the like. The assembly comprises a resilient base member adapted to be held by the fastener or screw upon a planar portion of a workpiece. A resilient anchor member includes a planar, flange like base of generally circular cross section having a central orifice defined therein through which a screw or fastener passes, and an integral peripheral rim having an external surface upon which a plurality of radially spaced apart petals are integrally formed. A cup-like, resilient plastic cover plate adapted to be snap-fitted upon the anchor includes a generally convex top portion and a peripheral downwardly projecting rim. The cover plate rim includes a snap fit groove into which the anchor petals are received.