Abstract: A collapsible fastener comprises a tubular plastic having a head on one end for bearing against one surface of the work. There is an internally threaded tail portion at the shank end of the sleeve. The shank is slotted to define strips which are notched internally and intermediate the ends. The slots increase in width from their ends to the area of the notches. A screw extends through the sleeve and is devoid of threads intermediate its ends to prevent overtorquing. A radially tapered annulus is positioned atop the sleeve for sealable engagement with the screw head in the assembled condition.

Abstract: According to a depicted embodiment thereof, the novel earth bit comprises a shank having a threaded end and a bit head centrally bored and threaded to receive a shank. A stack of apertured discs, however, is interposed between the threaded bore or cavity in the bit head and the threaded end of the shank. The discs intimately engage, and bridge between, the shank and bit head threads, and communicate torque therebetween. The bit head cavity has a bearing surface or land upon which the discs are supported, and the shank has an annular shoulder which bears upon the stack and, thus, compressive forces are communicated from the shank to the bit head. The bit head, of the invention, then, comprises the aforesaid bit head, having the stack of discs secured therein by a retainer, for use, in a plural-part earth bit having a threaded shank.

Abstract: An expansion sleeve for attaching objects to a relatively thin panel comprises a hollow headed bolt threaded externally for its full length and threaded internally at an end portion remote from the head. The unthreaded internal portion of the bolt has an inwardly projecting apertured annular shoulder into which a drift pin may be driven to expand the sleeve on the interior side of a panel to which the sleeve is to be attached. A jamb nut pulls the expanded sleeve portion firmly against the inside of the panel member and thereafter a threaded rod is threaded into the interior threads of the sleeve so that a nut on the threaded rod may be tightened against the sleeve head. This draws the inner end of the sleeve toward the panel member to increase the pressure of the expanded sleeve portion against the panel. An object to be attached to the panel is then connected to the protruding end of the threaded rod.

Abstract: A one-piece, plastic fastener for lockable engagement in a workpiece opening, including a stem having an outer end and also having an inner end from which a pair of integrally formed arms extend. The arms have two ends, one end forming an acute angle with the inner end of the stem, and the other or free end terminating at an integrally formed head portion. The head portions are swingable with their respective arms about the inner end of the stem to cooperatively engage each other and to form a complete head having an orifice embracing the stem. The stem and arms are insertable into the opening to locate the head against the outer side of the workpiece. Positive and outward withdrawal of the stem through the opening and orifice causes the arms to swing laterally and abut firmly against the inner side of the workpiece. Serration means between the head and stem maintain the fastener in lockable engagement with the panel by readily permitting outward movement of the stem while resisting its inward movement.

Abstract: To receive the weight of the body from the pelvis and distribute it evenly to the shaft of a fractured femur while bracing the fractured femur, an intramedullary hip pin engages a plate secured to the lateral cortex of the shaft. The hip pin has an enlarged end portion positionable within the head and neck of the femur to receive and distribute forces from the pelvis and to impede protrusion of the pin through the head of the femur. The hip pin also includes an expansible member in the form of a cage for tightly securing the hip pin within the head and neck of the femur. The plate is adapted to be secured to the outer surface of the femur and includes an inclined, tubular, pin-receiving portion extending partially into an opening formed through the surface of the femur and into the neck of the femur.

Abstract: A pull-type blind fastener assembly includes a mandrel, expander, sleeve and lock collar. The expander extends through aligned holes in at least two workpieces, that are to be joined and has an enlarged head and a shank portion with a pair of conical tapered surfaces separated by a constant diameter surface thereon, adjacent the blindside end thereof. The tubular sleeve has a maximum thickness portion adjacent one end, an intermediate portion of medium radial thickness and a minimum radial thickness portion adjacent the other end. When an axial force is exerted on the mandrel by means of a conventional pulling tool, the minimum sleeve thickness portion is forced successively over the first and second conical expander surfaces where it is expanded, and a radially outwardly extending bulb begins to form at approximately the intersection between the minimum and medium thickness portion adjacent the other end.

Abstract: A self-plugging blind rivet (10) embodies lockingly interengageable members in the form of a headed tubular rivet body (12) with a bore (20) which reduces in diameter towards the head (18), and a mandrel (14) for setting the rivet. The mandrel (14) has a break-off stem (60) and a plug portion (62) which is left in the bore (20) of the rivet body (12) after setting the rivet. The plug portion (62) engages the end of the body (12) remote from the head (18) and has radially projecting longitudinal splines (102) which form grooves in the body (12) when pulled into the reduced diameter region (26) of its bore, and has a cylindrical swaging portion (84) which swages material of the body into parts of the grooves along which the splines (102) have passed so as to lock the plug (62) in the bore (20) and prevent its retraction from the set rivet.

Abstract: There is disclosed a wall anchor structure having a hollow body in which spaced ribs extend from a flanged portion at one end to a sleeve in which an axially movable nut element is captured. A bolt extends through the body from the flanged end to threadedly engage the nut. With the bolt head abutting the flange, the structure is struck or otherwise inserted through a dry wall or wallboard to bring the flange flush against the inner surface of the wall. The bolt, being slidable, is grasped at the head and pulled out to separate the head from the flange an amount permitted by the axial travel of the nut. This permits the jaws of an anchor operating tool to be inserted between the head and flange, and forced apart to forcibly separate the head and flange further, causing the ribs to deform so as to bite into and interlock with the wall material. The bolt is then threaded out of the nut and removed to permit a bracket or other support member for shelving or the like to be seated against the flange.

Abstract: A one-piece plastic plug-rivet having an open frame body which is laterally expandable and having a cylindrical appendix disposed within the body and being formed with a pull shank for producing the expansion. The cylindrical appendix is provided with projection means which cooperate with a stepped aperture in the head of the plug-rivet for maintaining the body in the expanded condition.

Abstract: Toggle which can be set against the face of an undercut provided within a bore, and having an elongated bolt, on whose bore-internal end locking elements are mounted, which, by means of a conical component disposed for axial displacement on the bolt, can be expanded outwardly from a position in which they are within the diameter of the bore to a position in which they engage the face of the undercut. The locking elements are supported on a bottom piece on the end of the bolt within the bore, and are in the form of segments of a thick-walled cylinder when in the retracted position. A variety of anti-rotational means are provided to prevent the toggle from turning during the setting operations.

Abstract: An improved assembly for mounting a part onto a base member is provided by incorporating a tubular insert having a hollow inner core in a mounting hole in the part. A fastener, such as a bolt, machine screw or rivet may then be inserted through the insert in the mounting hole for attachment to the base member. When the assembly is subjected to axial compression by the fastener, the insert collapses uniformly in an axial direction to absorb a substantial amount of the total compressive load exerted upon tightening the fastener.

Abstract: An improved assembly for mounting a part onto a base member is provided by incorporating a tubular insert having a hollow inner core in a mounting hole in the part. A fastener, such as a bolt, machine screw or rivet, may then be inserted through the insert in the mounting hole for attachment to the base member. The tubular insert has an integral flange on the end which engages the fastener. The flange functions as the "washer" in conventional fastener assemblies. When the assembly is subjected to axial compression by the fastener, the insert collapses uniformly in an axial direction to absorb a substantial amount of the total compressive load exerted upon tightening the fastener.

Abstract: A plastic screw anchor for fastening fixtures and other objects to a hollow wall, the anchor including a four-legged diamond-shaped shank whose front legs are joined together by a front apex living hinge and whose rear legs are joined to the front legs by side apex living hinges, the ends of the rear legs defining a rear apex. Secured by a pair of normally outstretched resilient webs to the rear legs of the shank is a flanged socket whose bore lies in registration with an opening formed in the front apex hinge. The diamond-shaped shank is collapsible to form a tongue that is insertable in a hole drilled in the wall to accommodate the socket, the webs then reverting to their outstretched condition to cause the shank which is now behind the wall to recover its diamond formation. When a self-tapping screw is turned into the socket bore, it acts to thread the bore.

Abstract: A dowel, arranged to secure an article to the surface of a receiving material having a hollow space within it into which the dowel extends, is formed of an axially elongated dowel body and a flange member at one end of the dowel body. The flange member includes a flange part extending transversely outwardly of the dowel body. The dowel body is formed from a strip of material and includes an end part extending transversely of the axial direction of the dowel body with a threaded opening through the end part, and a pair of axially extending legs divided into webs and extending in the axial direction of the dowel body from the end part. Inwardly directed recesses are formed in the ends of the legs spaced from the end part. The flange member includes a sleeve-shaped projection extending generally perpendicularly of the flange part.