Abstract: The rivet comprises a tubular body 12 having a shank 14 having a rivet head at one end and an end portion 32 of which is tapered externally and internally towards the other (tail) end 20. A stem 10, disposed in the bore 18 of the body, has a stem-tail 22 which projects from the head end and breaks off when the rivet is set, a plug 24 in the bore 18, and a terminal head 28 abutting the tail-end 20. The diameter of the plug is reduced progressively and stepwise towards the terminal head, providing an abutment 50 and an annular groove 29 between the terminal head 28 and the abutment 50. Material of the end portion 20 extends into the groove to maintain the body and stem assembled, and enters further into the groove during setting of the rivet.The rivet is set by pulling the stem tail while supporting the body, causing the shank to collapse into a bulge which provides a blind head.The external tapering of the portion 32 promotes bulging at a lower applied force than would otherwise be required.

Abstract: A self-clinching fastener of the type for connection to a workpiece comprising sheet material, includes a head and a shank, with a groove formed in the shank, with the head being embeddable in the sheet material to displace material thereof into the groove to form a mechanical interlock between the material of the sheet material and the fastener. The head includes a plurality of radially disposed projections extending axially outwardly of an undersurface thereof and intermediate the undersurface and the groove. These projections each include an axially facing recess therein, such that the material of the workpiece being displaced will flow into the groove and the recesses in the projections, to lock the fastener to the workpiece. The shank may also include an extruding portion to resize an aperture in the sheet material, prior to the deforming of said sheet material by said head.

Abstract: A combination lock system on a narrow stile door having selective operation through a drive mechanism including a slide for retraction of the latch bolt operated by the combination lock and a manual control or key operation of the latch bolt. The key operation provides an override of the combination lock operation.

Abstract: A stud/bolt load gauge assembly. A gauge screw threadably engaged in a stud or bolt has a top, belleville, overload, and bottom washer mounted between the head of the bolt and the head of the gauge screw. All of the washers are movable until axial stress on the bolt equal to the minimum desired load causes the underload gap to be taken up by the gauge screw. Then only the overload washer is movable. The overload washer becomes immovable between the top and bottom washers when the bolt load is increased beyond the desired maximum load, causing compression of the belleville spring washer to a substantially flat state.

Abstract: A holding screw rotatable in an inward direction having means to prevent or retard rotational movement in the opposite direction.

Abstract: An expansion anchor assembly includes an expansion sleeve formed at least in part by axially extending extension sections, an expansion body and an anchor rod attached to the expansion body. By pulling the expansion body into the end of the sleeve formed by the expansion sections, the sections are spread radially outwardly. An axially extending part of the outside surface of the expansion body is formed by a plurality of outwardly tapering axially extending and circumferentially adjacent convex surfaces having an arc shape in the direction transverse to the axial direction of the expansion body. The radius of curvature of each arc-shaped convex surface is the same over its axial length. Each expansion section of the sleeve has an axially extending radially inner concave surface corresponding to one of the arc-shaped convex surfaces on the expansion body.

Abstract: A ventilating, patient-supporting mattress apparatus is provided which provides full patient support solely by means of pressurized airflow and with the complete absence of internal solid support structure which can cause pressure sores or the like on a patient's skin. In preferred forms, the mattress apparatus includes a lower inflatable chamber having an air-pervious upper wall, together with a secondary, air-pervious, overlying suede or un-buffed leather wall secured to the chamber to define an upper inflatable compartment between the upper and secondary walls. A fan assembly is operatively coupled with the lower chamber to supply pressurized air thereto; such air is passed into the chamber and thence through the upper and secondary walls in a throttled fashion so as to inflate the mattress. Continuous airflow through the mattress also provides soothing ventilation for sensitive skin.

Abstract: A fastener for securing built-up roofing membranes used to waterproof cementitious roof decks combines the conventional nail used for this purpose having a head and a shank portion designed to resist withdrawal of the fastener from the deck, with a non-integral tab penetrated by the shank of the nail and of larger diameter than the nail head, the tab having a design which allows the fluid asphalt conventionally poured over the nail during construction of the roofing membrane to bond the portion of the membrane beneath the tab and thereby increase the wind uplift resistance of the covering material. Removability of the tab allows its detachment in applications where increased uplift resistance is unnecessary.

Abstract: A limited torque bolt-nut assembly including a bolt shank having a threaded first end portion and a non-threaded second end portion, a secondary drive head on the second shank portion and a primary shearable drive head on the secondary drive head, and a hollow nut secured over both drive heads and a portion of the non-threaded shank section. The hollow nut drives the primary drive head which rotates relative to the secondary drive head until the primary drive head shears off at a predetermined torque releasing the nut and primary drive head. The secondary drive head remains on the bolt shank for adjustment and removal of the bolt.

Abstract: In an air mat apparatus comprising a mat body having a plurality of defined air chambers, there is an air source for feeding air to each of the air chambers of the mat body and a changeover valve connected between the mat body and the air source for controlling the air feed from the air source to each of air chambers. An air-containing elastic layer is laid on the upper surface of the mat body. The air-containing elastic layer has such an elasticity and is provided with numerous voids which can suck air into the inside and which are open to the outer air so that the air-containing elastic layer is made to discharge and suck air when the air chambers are inflated and deflated whereby compulsory ventilation is achieved between the mat body and the body surface of the user.

Abstract: An improved bicycle pedal which positively grips the biker's shoe for imparting force to the crank assembly on both the upward and downward stroke of the biker's foot. The pedal comprises a molded tubular member having a longitudinal bore for receiving an axle member therein and having an integrally formed, generally flat surface projecting laterally outward from the cylindrical member and generally tangent thereto. The flat surface member is notched with the edges of the notch being chamfered so as to be wider at the base than at the top. A cleat of a shape adapted to mate with the notch is attached to the sole of the bikers's shoe. When the sole of the biker's shoe is placed on the generally flat surface, the cleat fits into the notch and a beveled portion of the cleat mates with the chamfered edge of the pedal in dove-tail fashion to releasably lock the biker's shoe to the pedal.

Abstract: A captive panel fastener includes three parts, a screw, a tapered bushing, and a slotted expandable sleeve. The bushing fits closely over the shank of the screw, and has an outwardly extending shoulder or flange at its lower end away from the head of the screw, to retain the expandable sleeve in the expanded condition. The slotted sleeve has a cylindrical upper flange which is generally co-extensive with the head of the screw, and has a lower flange which in the initial or relaxed condition is smaller than the panel hole through which the captive fastener is to be secured. Following insertion of the shank of the screw and the unstressed slotted sleeve into a hole in a panel where the fastener is to be secured, further pressure on the head of the fastener forces the sleeve into the bushing, expanding the lower end of the sleeve, so that its lower slotted flange grips around the lower edge of the panel.

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 device for rapidly mounting a plate (P) on a chassis (C) comprises flexible displaceable arms (4), formed by a single piece of moulded synthetic resin (1). The piece has a lateral opening for inserting a damping element (5) of rubber. The assembly can no longer be dismounted when a connecting piece (6) of suitable diameter is inserted.

Abstract: A knockdown platform or storage bed employs single or double rows of U-shaped channel members to join laterally opposed sideboards, through a detachable coupling at opposed ends of the channel members, to receivers fixed to the inside of the sideboards at longitudinally spaced positions and at both ends. The channel members are provided with C-shaped slots to each side slidably receiving insertable panels to form with the channel members a planar mattress support. The sideboards act in conjunction with endboards to define via a sideboard ladder frame and through other U-shaped channel members, a support system for drawers slidably insertable through the open ladder frame, to create a storage bed. The panels are sized to the slidably insertable drawers to function as covers, overlying the drawers when the drawers are removed. The couplings include pivotable, overcenter latches mounted to the interior of the U-shaped channel members at their ends.

Abstract: A locknut having a body portion with an outer surface and first and second ends, a thread extending inwardly into the body portion from the first end, a depression in the second end, an inwardly tapered lobed curvilinear surface defining the periphery of the depression for receiving a mating key, and an external thread extending from the second end onto the outer surface for receiving the internally threaded surface of a sleeve mounted on a key for attaching the key to the locknut. The locknut as described above including a rotatable sleeve mounted thereon with a shroud located radially outwardly of the external thread. A locknut as described above wherein the outer surface extending from the first end is frustoconical and terminates at an annular shoulder which is located radially outwardly of the external thread.

Abstract: This invention provides a captive fastener in which a nut is held to a workpiece by a retainer ring held in a two-piece grommet attached to the workpiece, the retainer ring being flat and split, with its grain perpendicular to a diameter bisecting the split, and its inner and outer edges having alternate elongated recesses to increase the effective ring width without increasing spring force. The stud assembly includes a cage secured to the other workpiece, with side flanges removably and floatingly retaining a housing in which is a stud and spring biased ratchet washer. The notched outer end of the housing is bent over the head of the stud to secure the stud. The ratchet washer has tabs fitting in the housing wall, and ratchet teeth to engage teeth on the end of the nut. A cover fits over the housing.

Abstract: A screw-in fastener for an anchor embedded in a precast concrete element includes a coupling member, to which a transport anchor is applied, a threaded pin insertable into the anchor positioned within the concrete element, and a supporting plate, from which the pin outwardly extends. The supporting plate has a circular end face supported against the upper surface of the concrete element.

Abstract: An anchor bolt for clamping an object tightly against a receiving surface comprises a threaded elongated anchor rod having a head, an expansion body threadedly received on the rod in spaced relation to the head, and an expansion sleeve on the expansion body that is expanded as the rod is threaded into the expansion body. The anchor rod extends through an outer sleeve between an abutment on the head and an abutment on the expansion body, and spacers, such as a coiled spring or further sleeves, are provided between the anchor rod and the outer sleeve. The bolt provides improved shear resistance and anti-vibration efficiency.

Abstract: A fastener clip adapted for use with an associated fastener includes a head portion having an aperture through which the fastener extends. A pair of integral, spaced apart legs extend from one side of the head portion. Each leg includes first and second portions with the second portion being bent back upon the first portion in a position spaced outwardly thereof. A finger portion is located at a free end of the second portion and extends inwardly toward and through an aperture in the first portion. When a tension load is imposed on the clip, connecting zones between the first and second portions of each leg are deflected toward each other to apply a clamping force to a fastener extending therebetween. Also, the finger portions are shifted to positions which enhance seating of the clip in an associated workpiece.