Abstract: A screw includes a head and a shank which extends from one side of the head, a substantially cubic recess defined by four sides in the other side of the head, each of the four sides having a short slot perpendicularly outwardly extending therefrom and each of the four short slots communicating with the cubic recess.

Abstract: A threaded fastener which is constructed to be turned in one direction by a square socket drive includes a threaded stem and an integral modified head arranged with four raised projections which are circumferentially spaced. Each of the four raised projections includes a substantially flat wall portion and a curved and inclined ramp portion. The four flat wall portions effectively define a square center region which is compatibly sized to receive a one-half inch square socket drive. Rotation of the square socket drive in a counterclockwise direction causes the sides of the square socket drive to engage the flat wall portions so as to turn the threaded fastener in a counterclockwise direction. Any attempt to rotate the square socket drive in a clockwise direction causes the sides of the square socket drive to ride up along the ramp portions and ride out of engagement with the modified head of the threaded fastener.

Abstract: The present invention provides a device for protecting automobile wheels from being stolen, wherein the barrel portion of a hub nut to be tightened onto a hub bolt of an automobile wheel is shaped as a turning operative engaging surface in the form of a quasi-equilateral triangle whose each side consists of a convex surface. The engaging surface is cut at one, two or three sides thereof to form keyways extending parallel with the axis of rotation. Thus, unless an exclusive turning tool adapted to fit on the hub nut is used, the wheel cannot be removed.

Abstract: The angularly accessible head for a threaded connector comprises a spherical structure having a centered slot therein, the slot having a bottom surface or wall in the shape of an inverted V, with a point thereof extending toward the center of the sphere. The cooperating tool includes a hollow cylindrical head portion having an open end, the open end being defined by opposed plateau areas in one plane and opposed cusp areas in a transverse plane, with a rod extending across the open end between the plateau areas.

Abstract: A screw for snugly-fitted tightening pairs, of the type having a lobate head or a lobate-socket head (31), in which each lobe (37) is formed of one face (37') directed in a substantially circumferential manner and two other substantially parallel faces (35, 36) directed inwardly of the screw; said screw is provided with a reaction surface (33) with a tightening wrench (32). The portions of said reaction surface (33) included between two adjacent lobes are comprised each of a pair of faces (38, 39) inclined to each other to form an angle concave towards the outside of the screw, so as to constitute a reaction surface with a wrench of a polygonal profile. Such a screw can be operated to advantage either with the polygonal wrenches of the known art, or with an innovatory mating wrench of a lobate configuration.

Abstract: A nut device and corresponding tool of such shape to aid in the ease of removal from a threaded bolt, stud, or the like. The principal intended use of this invention is for fastening the wheels of a vehicle to the vehicle's axle, but could easily be applied to any threaded fastening system. The nut and subsequent tool fit together in such a manner that prevents slippage or dislodging of the tool from the nut while in operation. This problem is common for conventional hexagonal-type threaded fastener and tool systems that are typically used on wheels of vehicles.

Abstract: A recessed screw has a recess formed in the head of screw, with the recess being defined as a superimposition of two equilaterally-triangular recesses each having vertices shaped arcuate and arranged coaxially with a phase shift of 60.degree. around the screw axis. The recess thus has alternating six grooves and six driven vanes having side walls extending parallel with the axis, and an inner ridge of vane is a conically curved sticking wall inwardly slanted towards a bottom of the recess. A cross-sectional area of groove is larger than that of each vane. A driver bit has six driving vanes in conformity with the grooves and six valleys each interposed between the adjacent driving vanes and corresponding to the driven vanes in the recess, such that a biting action appears between the recess and bit, the driving vanes can be strengthened, and any conventional bit for Torx screws can be used with the recessed screw.

Abstract: A threaded tubular fastener having an elongated central through-bore having engaging means for engaging said through-bore with a rotary device having a rotary driver, a generally cylindrical body having an external surface with a main external thread formed thereon with a plurality of slots, said thread being larger than the diameter of a pre-drilled hole in a first work piece and a second mating work piece wherein the said threaded tubular fastener is employed to fasten the first work piece to the second work piece.

Abstract: A metallic structural element for connecting workpieces consisting of wood, woodworking material or plastic, consisting of a lamellar part, which provides the non-positive connection with the first workpiece provided with a groove and a transverse hole, and a bolt-like part which, through screwing or pinning, realizes the non-positive connection with the second workpiece provided with a longitudinal hole. The lamellar part has, in the center, a hole which is at right angles to the plane of the lamella and is intended for fixing in the groove of the workpiece. Variants having a wing-like long or rectangular short lamellar part and a bolt-like part in the form of a conical wood screw, cylindrical screw, screw having a metal thread, threaded sleeve or pin. Accessories: screwing tool and drilling template.

Abstract: The invention herein disclosed involves a "tamper-evident bolt". More specifically, the bolt has ratchet or splined teeth on the outer periphery of the bolt head which will accept a socket for tightening the bolt. In the center of the head of the bolt is a sealed or capped blind axial recess. The recess is fitted to accept a driver to release the bolt. In a specific embodiment the blind axial recess has ratchet teeth. A seal or cap is received within the blind axial recess such that the seal or cap must be removed for access to the bolt releasing means, thereby indicating the possibility of unauthorized tampering with the bolt.

Abstract: For its drive a screw is given a recess, which has an outer contour diverging from the circular shape. In the radial inner area and/or radial outer area of the recess the side walls are formed by individual surfaces located on a conical surface.

Abstract: The invention consists of two gear teethed nuts meshed together in an arrangement that causes both the nuts to move at the same rate of speed and in the same direction up or down the threaded rod arms of a U-bolt clamp whenever one of the nuts is turned. The meshed nuts apply similar and simultaneous pressure upon the crosspiece of a U-bolt clamp which crosspiece moves relative to the threaded rod arms which transverse it through apertures in the crosspiece. A clampling force is achieved between the crosspiece and the curved portion of the U-bolt as the two members are forced together by movement of the meshing nuts turning upon the threaded rod arms and pressing against the crosspiece.

Abstract: Panels of a security paneling system are secured to a support member with a plurality of security fastening assemblies consisting of a security fastener and a security washer. The security fastener includes a shank connected to a slotless head including a peripheral edge portion having a special shape. The security fastener is rotatable for installation and removal with a special driving tool including a driver head which has a cavity with an internal shape corresponding to the shape of the peripheral edge portion of the security fastener head and is adapted to fit over and drivingly engage the peripheral edge portion. The security washer includes a central aperture through which the shank of the security fastener extends and a recess concentric with the aperture for receiving the head of the security fastener.

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: A tamper-proof drive system including a drive tool and a complementary nut or fastener drive head each having a body defining a central axis and a drive portion formed in an end surface of the body about the central axis. The drive portion defines a plurality of symmetrical lobes in a circular array. The lobes are defines by three series of arcuate surface, two of which may be generated from circular or elliptical configurations while the intermediate surface is partially circular.

Abstract: A fastener head having a pair of recesses formed therein, a ledge in each recess being located a short distance axially below the head surface and extending a predetermined angular length from the axial portion of the ledge. The dimension of the ledge is adjustable to accommodate the strength of the fastener material in a manner such that the displacement formation of recess material on the surface of the fastener head is prevented during normal installation procedures. The drive angle on the recess is designed to be zero degrees.

Abstract: A threaded fastening member includes an actuating end having a head. The head has a diameter projecting beyond a diameter of the thread of the fastening member and is coaxial with a thread axis. A centrally located recess is provided within the head for the application of interior forces. The recess includes radial outwardly projecting slots, each having two flanks lying in respective planes. Each flank plane is essentially tangential to an imaginary cone that is co-axial with the thread axis. The recess further includes a pair of segmented circumferential faces separating each slot from an adjacent slot, and a transitional linear inner edge formed between each pair of segmented circumferential faces and each flank of a respective slot.

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: An improved fastener having a non-circular head with a concave recess providing a datum useful in centering the head relative to a non-circular socket of a driving member is disclosed. The recess may have a frusto-conical wall defining an upper, circular edge or substantially triangular walls defining an upper, non-circular edge. An improved tool useful to drive the improved fastener is also disclosed. In the improved tool, a driving member has a tubular extension with a non-circular socket, and a centering pin is axially movable toward and extended position, in which a convex end of the centering pin fits into the concave recess of the screw head when the socket of the tool extension is axially fitted over the fastener head. The centering pin is biased toward the extended position.

Abstract: There is disclosed a torque transmitting or coupling arrangement for a fastener drive system or the like, wherein the respective externally configured and internally configured components are provided with a series of mating, elliptically curved flutes and lobes. In both the externally and internally configured components, the flutes and lobes are defined by a first series of elliptically curved surfaces which alternate with a second series of elliptically curved surfaces, with the respective surfaces merging smoothly and generally tangentially to define the alternating flutes and lobes on each said component. One of the components, either the externally configured or the internally configured component will preferably have the flutes and lobes thereon generated from ellipses of substantially equal dimension. The other component, of necessity, will have the flutes and lobes generated from ellipses of differing dimensions.

Abstract: A tamper-proof fastener provided with a threaded shank and a low-profile drive head integral therewith. The drive head has a generally frusto-conical shape defining a circular flat top and a circular base of larger diameter, three short noses separated 120 degrees apart projecting from the sloped side of the drive head. The fastener is installed in a substrate or withdrawn therefrom by means of a tool having a driver head provided with a complementary frusto-conical socket to accommodate the drive head of the fastener, the wall of the socket having recesses therein to receive the noses of the head whereby a torque may be applied thereto.

Abstract: A lug nut and socket wherein the socket and nut engage only selected point surfaces. In one aspect of the invention the socket has a decreased number of point surfaces. In another aspect of the invention, the lug nut has a decreased number of point surfaces. In another aspect of the present invention the socket points surfaces include point pins which are positioned to engage a pair of diametrically opposed point surfaces on the lug nut. The point pins are removably inserted into point pin wells extending into the lug nut socket. In another aspect of the present invention a retainer ring is provided to prevent the removable point pins from falling out during operation or handling, or otherwise being unintentionally removed. In another aspect of the present invention, the socket bore which engages a lug nut during operation is deliberately oversized to allow for considerable play between the lug nut and the socket.

Abstract: By modifying a shape of a head part of a screw, an inserting performance when a punching operation is carried out, a fastening performance when the screw is seated, and a finishing process upon completion of fastening against a member to be fastened are improved.A seat surface of the head part is formed in an inverse truncated conical shape with its outer circumference being a curved concave surface and the upper surface of the head part is formed with a spherical concave surface. The head part is provided with a plurality of spot facing projections extending from the seat surface of the small diameter part at the lower portion of the head part adjacent to the screw shaft part along the curved concave surface of the seat surface in a longitudinal direction. The upper surface of the head part formed in the spherical concave surface is provided with chamfered portions in which an opening edge of the engaging groove of a cross-shaped hole is cut in a conical shape.

Abstract: A shape of the head part of the screw is improved and performance of insertion of the screw when punched and performance of fastening of the screw when seated as well as a finishing treatment upon completion of the fastening against a fastened member are improved.The head part is made such that the upper surface having an engaging groove to with which a screw driver tool is engaged has a spherical surface, and the head part is comprised of an upper large diameter part formed with a first seat surface of inverse truncated cone shape having an outer circumference of a curved concave surface and a small diameter part formed with a second seat surface of an inverse truncated cone shape concentrically and integrally connecteed to a lower part of the large diameter part and having its outer circumference of a curved concave surface, and an annular projecting edge is formed at a connection part between the seated surfaces of the two-stage curved concave surfaces.

Abstract: A fastener screw includes a head portion, an elongated shank and a multiple-lead thread formed on the shank opposite the head portion. The head portion has a generally planar end surface having a polygonal drive recess therein. A generally longitudinal chip relief slot is formed along the thread and defines a longitudinal thread profile cutting edge. The underside of the head portion is defined by a generally concave annular surface having a plurality of outwardly projecting serrations formed about its periphery which burr into the workpiece and effect a self-locking action therewith as the screw is threaded into the workpiece.

Abstract: A hexagon head bolt having a head with an incline formed on each of the outer faces thereof so as to be inwardly inclined toward a respective corner of each face. Thus the head of the bolt can easily be engaged with the socket of an impact wrench or the like, without damage of the corners of the bolt. In another embodiment, a hexagon socket is provided having an incline formed on each of the outer faces thereof so as to be outwardly inclined toward a respective corner of each face.

Abstract: A recessed drive socket in a fastener or the like, is driven by a mating, drive tool received within the socket. The socket cavity has a multilobular cross-section defined by an alternating annular series of adjacent socket flutes and socket lobes extending parallel along a general central axis from an entrance opening into the cavity circumscribed by a peripheral support collar. Each socket lobe is truncated by a guide surface inclined from the opening at a radially outer edge of an adjacent socket flute into the cavity to form a tool clearance recess portion of the guide surface which defines the radial outer edge of the adjacent flute.

Abstract: A threaded fastener having a recess or projection in a head for engagement with a jointing equipment is disclosed. The recess or projection is composed of a center portion and radial portions extending radially outward of circumference of the center portion. Each of the radial portions includes a pair of straight line section and a rounded corner to prevent stress concentration for providing substantial strength against press-molding and applied torque.

Abstract: A screw head is provided with ribs on some of the driver engageable surfaces. The rib is slanted outwardly from the screw axis by a small angle between 1.degree. and 10.degree..

Abstract: A torque limiting bolt for tightening by a power wrench comprises a threaded shank, a tightening head at one end of the shank, a retaining head at the other end of the shank and a nut in threaded engagement with the threaded shank, the tightening head being an eight point head having sixteen external facets of equal size and uniform spacing around the circumference of the head. The power wrench is provided with oppositely rotatable inner and outer sockets engaging the driving head and the nut, respectively, the inner socket being an eight point socket having sixteen internal facets.

Abstract: A combined socket is provided, whereby a screw can be driven either by a cross tipped Phillips type driver or by a square Robertson type driver. The wings of the socket have end walls that curve convexly to permit the end wall to be clear of the corner of the square, right down to the bottom of the end wall. The vertical side faces of the socket have portions inclined at different angles. The upper and lower portions are inclined respectively at a greater angle to the vertical and a smaller angle to the vertical as compared to the side faces of a conventional Robertson type socket allowing a Robertson type driver to contact the side faces part way along the faces.

Abstract: A window shade holder which has a slot member and an aperture member. Both the aperture member and the slot member may be formed with solid body portions from which an integral screw extends. The aperture member and the slot member may also be formed with hollow body portions which utilize a bridge element from which an integral screw extends.

Abstract: A threaded fastener organization is set forth wherein an axially threaded shank includes an enlarged overlying head wherein the head is provided with a square prismatic recess formed through an upper surface of the head and wherein the recess is formed with planar walls, each aligned parallel to the axis of the threaded shank. Each wall includes a semi-spherical recess for reception and engagement with a detent sphere associated in a conventional ratchet driver.

Abstract: A multi-part locknut including a locknut body, a locknut head having an endless curvilinear key-receiving groove therein secured to the locknut body, and a locknut sleeve rotatably mounted on the locknut body and held in position between portions of the locknut head and locknut body.