Abstract: A detent apparatus for preventing the rotation of delivery valve holders threaded into the body of a fuel injection pump comprises a generally rectangular flat plate which is formed with substantially semicircular notches at its opposite edges for receiving adjacent ones of the delivery valve holders, respectively. A bolt is threaded into a central opening of the flat plate to abut against the top of the pump body with such a force that the flat plate is raised into pressing contact with the undersides of enlarged head sections of the delivery valve holders, thereby ensuring firm frictional engagement between the delivery valve holders and the pump body into which the delivery valve holders are threaded.

Abstract: The utility of an expansion fastener including an externally threaded shaft having a head shaped so as to be capable of being engaged by a manipulative tool, a generally cylindrical longitudinally split sleeve located around the shaft, a nut threaded on the shaft, the sleeve and the nut including coacting surfaces capable of expanding the sleeve as the nut is moved on the shaft can be improved by utilizing coacting structures on the end of the sleeve remote from the head and on the nut for preventing relative rotation between the sleeve and the nut as the shaft is turned. Preferably the sleeve is twisted slightly in a spiral-like manner so that an end of the sleeve serves as one of the coacting structures which engages an adjacent ridged or other not smooth surface of the nut serving as the other coacting structure.

Abstract: A snap ring cooperating with a double acting cam provided by a land formed on the shank of the bolt serves to lock the bolt into place and requires a positive predetermined torque to retract the bolt.

Abstract: Expansion dowels for use in slabs, masonry and similar structural components having a face surface and a hollow space inwardly of the face surface so that the dowel can be inserted through the face surface into the hollow space. The dowel has a shaft part which extends through the face surface into the hollow space. Expansion arms are flexibly articulated to the shaft part and are located in the hollow space when the dowel is inserted. Support levers are flexibly articulated to the expansion arms and are interconnected by a link. The support levers are also located within the hollow space when the dowel is fully inserted. The expansion arms and support levers can be angularly displaced between an insert position so that the dowel can be inserted into the hollow space and an expansion position for holding the dowel in the inserted position. Releasable stops are provided for securing the expansion arms and support levers in the insert position.

Abstract: A fastener assembly for attaching articles to a penetrable surface such as drywall material found in the interiors of buildings. The assembly is comprised of a fastener, which fastener has a threaded shank with a pointed end and either a head or a second threaded end and an anchor member piercedly captured by the threaded shank of the fastener. The anchor member is held in a position substantially parallel to the axis of the threaded shank with the pointed end extending beyond the anchor member by a retaining means while the assembly is piercing a surface; as the assembly pierces the surface, the retaining means slips from engagement with the anchor member and, as the anchor member passes through the rear side of the surface penetrated, spring means on the anchor member urge the anchor member to a position substantially oblique to the axis of the threaded fastener.

Abstract: A threaded fastener capable of recutting damaged screw threads during installation in a threaded opening has an axial opening in its leading end intersecting a transverse opening whose ends extend through the screw threads of the fastener. The fastener is provided in its periphery at least in one location thereon with a longtiudinal recess of greater depth than the screw threads which intersects the transverse opening at right angles thereto and extends longitudinally of the fastener away from one side of the transverse opening which is remote from the axial opening. A thread cutting surface is produced by the recess and thread cuttings pass therefrom into the transverse and axial openings during installation of the fastener.

Abstract: A self sealing washer is disclosed which is made of three concentric, joined parts, an inner spacer ring, a middle sealing ring, and an outer spacer ring. The inner and outer rings are axially offset relative to each other and the sealing ring bridges the gap between the inner and outer rings.

Abstract: A quarter-turn fastener has a bolt having a head and a screw-threaded shank, and a retainer assembly threadably secured to the shank as a tight friction fit thereon. The retainer assembly has a pair of abutments for engagement with the rear of a support, through an aperture in which the retainer assembly locates in use. The retainer assembly includes at least one pair of stops for engagement with the sides of the aperture in the support or a corresponding aperture in a panel in which the fastener is mounted in use, to define the inoperative and operative positions of the retainer assembly. A compression spring is located in use between the retainer assembly and an opposed surface of the panel to retain the retainer assembly in its inoperative position under the action of friction, when the retainer assembly is disengaged from the support.