Abstract: A self-drilling blind rivet includes a main body having a bore, a mandrel trapped in the bore of the main body, the mandrel including an abutment end toward the main body, and a drill bit welded to the abutment end of the mandrel, the drill bit including a cold forged drill section.

Abstract: A method and apparatus for manufacturing anchor bolts to be fixed on concrete structures, with the method comprising preliminarily heading a steel rod to form at an upper end thereof, a head having a tapered surface gradually tapering downwardly from the upper end and decreasing in diameter; forming the mail screw at the other end of rod by thread-rolling and simultaneously rolling a part adjacent to the head to form a rod-portion of a reduced diameter by gradually displacing a surface layer of the rod-portion inwardly and outwardly to give rise to an inner and outer transient swells respectively forming a stopper a tapered portion merging into the tapered surface of head; and loosely fitting and expansible sleeve on the rod-portion of reduced diameter, with the sleeve being made by die-cutting and bending a metal plate into a cylindrical shape of an outer diameter substantially equal to outer diameter of the screw.

Abstract: A breakable composite drill screw comprises a first shank made of a metal unsusceptible of hardening, a driving head extending from one end of the first shank and engageable with a screw driving tool, a second shank made of another metal susceptible of hardening, the second shank being fixedly adjoined to the other end of the first shank to thereby provide a break zone at said other end, a drill bit formed by cold forging at an end of the second shank, a continuous thread formed by thread-rolling to extend around both outer cylindrical peripheries of the first and second shank wherein a portion extending from the break zone to the drill bit is hardened or quenched, and wherein said shanks are adjoined at their engaging surfaces to each other by projection-welding technique making use of a welding lug protruding from either engaging surface, said lug forming the break zone.

Abstract: A drill has a solid material shank (10), which is provided in its front region with a cold-forged drill point (11) with two cutting edges (12) approximately parallel to one another in projection and two flutes (13) running approximately in the longitudinal direction of the shank (10).

Abstract: A process and die unit for fabricating stepped nails wherein a top portion of a blank is pressed into a rough slender tip portion at the first step of the process, and a shank portion of the blank is pressed in the second step of process so as to have threads on the peripheral surface thereof, and the rough slender tip portion is simultaneously pressed for correction so as to refine into a finished slender tip portion.

Abstract: A self-piercing adapted to be affixed to a metal panel. The nut includes a substantially rectangular body, with a pilot portion provided at the center of an upper surface of the body, which pilot portion is defined by a circumferential side wall which is slightly converged toward an upper surface of the body. The pilot portion includes a punching face disposed around the threaded bolt accommodating hole. Seat faces are provided at each corner of the body, with each seat face being defined toward the pilot portion by a wall spaced from the circumferential side wall of the pilot portion but facing the same. A top level of the seat faces is slightly lower than that of the punching face of the pilot portion. A recess is defined by a space lying between the pilot portion and the seat faces. The recess is opened to continue each side of the rectangular body between adjacent seat faces.

Abstract: A self-piercing nut holding device for use in association with an automatic assembling machine, the holding device including a passageway adapted to allow a punch to pass through, the passageway including a nut delivery outlet through which nuts are individually placed at the "hold" position, the passageway being provided with an elastic member in a recess produced in its defining side wall, the elastic member having a body portion and a pair of leg portions which are supple against a force acting when the elastic member holds a nut situated at the "hold" position. The suppleness of the elastic member protects same against breaking; otherwise frequent breakages would lead to frequent interruption of the automatic assembling operation.

Abstract: A drill screw comprises an elongated threaded stem having a driving head at one end and a drill bit at the opposite end, the drill bit having a pair of axially extending flutes located oppositely with respect to the axis of the stem, each of the flutes having a cutting surface which is deviated from the axis, each of the cutting surfaces having an inwardly concave bottom with respect to an imaginary reference plane deviated from the axis but extending in parallel therewith, the cutting surface including a cutting edge formed by its front edge and a cutting blade formed by its side edge, wherein the cutting edge and blade are on the reference plane, and each of the cutting edge and blade having a rake formed by the cutting surface.

Abstract: A chute-hose coupler unit includes a first coupler and a second coupler each adapted to be detachably connected to ends of the respective chute-hoses, each coupler including a leaf spring which has a stop pin provided in its free flexible portion, and additionally including a cam means adapted to slide under the leaf spring of the mating coupler, the stop pin having a tendency of being inserted into the chute-hoses under the urge of the leaf springs, thereby blocking the component parts in the chute-hoses against dropping out of the open ends of the couplers when the couplers are disconnected from each other.

Abstract: An automatic piercing or clinch nut assembling arrangement which includes a punch member slidably supported in a punch holder connected to a press ram for pressing a piercing or clinch nut into a metal panel with a swaging die arranged opposite the punch member and cooperating therewith for swaging metal from the metal panel inwardly of the piercing nut to anchor the same in the metal panel. A nut holding arrangement is interposed between the punch member and the swaging die for holding a piercing nut in a punching path of the punch member. A monitoring arrangement is provided for electrically ascertaining the presence or absence of a piercing or clinch nut in the punch feed path.

Abstract: A conveyor arrangement for carrying a continuous row of component parts from a container or supply to an automatic assembling machine. A feeder chute is provided for feeding the component parts to a guide or feeder track which is operatively connected with a supply chute or hose connected to the assembling machine. A device is provided for maintaining the component parts in the guide or feeder track and an advancing mechanism is provided for advancing the component parts from an end of the guide track to an entrance of the supply chute or hose. Pawls are provided at the advancing mechanism and the supply chute for facilitating the advancement of the component parts and preventing return of advanced component parts from the supply chute or hose to the guide track.

Abstract: An automatic piercing nut assembling arrangement mounted at a ram of a press together with ordinary stamping dies and/or other assembling arrangements of the same type. A device is provided for temporarily suspending an automatic supply of piercing nuts to the assembling arrangement when it is necessary to suspend the operation of the press ram and/or press due to working conditions in the other devices on the press ram and/or the press. The device is effective so as to cause a punch of the automatic piercing nut assembling arrangement to physically block the piercing nuts so as to prevent the piercing nuts from entering a feed path of the punch.

Abstract: A load-indicating washer for use in joining two different elements which is capable of visually indicating the tightening force applied against a locking bolt and nut through the indication of encapsulated fluid released under the tightening load. The encapsulated fluid being provided in a depression formed in at least one bearing surface of the washer.