Abstract: A screw-holding belt (10) is composed of a belt body (11) made of a flexible plastics sheet, and cutouts (12) serving to intermittently drive the belt body are formed in and along either or both the lateral sides of the belt body. Screw-holding cylinders (13) are formed in the belt body at the same pitch as the cutouts so as to receive and hold shanks (17) of headed screws (16). The belt further has apertures (14) formed in it and extending outwardly and radially from the opening of each cylinder (13), and each aperture (14) is of a sector form having a width increasing towards its bottom (14a) such that these bottoms are portions of an imaginary circle coaxial with the cylinder and having a diameter greater than that of a head (18) of each screw (16). The adjacent two apertures (14) define between them a skirt (15) whose circumferential width decreases towards the imaginary circle.

Abstract: A position regulating parts feeder has a rotary hopper (11) and a slanted chute (20) fixed in the hopper that has lift plates (12) secured to its inner periphery. The chute is composed of an upstream receiving section (21), a middle sorting section (22) and a downstream discharging section (23). A groove (51) formed in the upstream section has an open top and is of a depth enough to wholly embrace each of the parts (1) lying on its side such that its front and rear faces are oriented sideways. The side walls have upper oblique zones (31c) and (41c) to widen the groove towards its top. A path defined in the middle section and continuing from the groove is composed of a main passageway (53) extending to the downstream section for transfer of the regularly positioned parts, and an auxiliary passageway (54) branching off from the main one for transfer of the inverse parts to an outlet (35) formed in a bottom of the chute.

Abstract: An apparatus for automatically fixing the self-piercing nuts has a striking punch (2) for causing the end face of each nut (N) to pierce a metallic panel (P) laid on a caulking die (1) and to be fixed to the panel, and also has a mechanism for intermittently feeding the nuts. The mechanism is composed of a rigid frame (6) to which a slide guide (3) is fixed and a movable chute (8) having a distal opening (8a) communicating with a feeding aperture (5) opened in the slide guide and a proximal opening (8b) communicating with a flexible chute (7). The movable chute (8) held in and connected to the rigid frame (6) is driven by an actuator (22) mounted on the frame so as to swing between an operative and inoperative positions.

Abstract: An apparatus has a punch (3) for striking the self-piercing nut `N` to one side of a metal panel `W`, a piercing-caulking die (5) facing the punch and located on the other side of the panel, and a nut holder (4) having formed in it a guide passage (10) slidable relative to and fitting on the punch. The nut holder further has a nut-feeding aperture (11) opened perpendicular to the passage (10), and the punch (3) is connected by a back plate (7) to a base (8), with the die (5) being driven towards and away from the punch. A cylinder (20) fixed on the back plate drives the nut holder (4) fore and aft along the punch, so that the nut is fed through the aperture (11) into an area located near and ahead of the punch's end when the nut holder is retracted. The punch's end will be located in flush with or slightly protruding ahead of the passage's end opening when the holder is extended.

Abstract: An apparatus makes self-piercing nuts from blanks (11) each having a cylindrical pilot portion (13) which has a raw unopened and unthreaded bore (12) and an end surface serving as a punch. The pilot portion surrounded by a rim (14) extending along a periphery a nut body, and an annular groove (15) is present between the pilot (13) and the rim. The apparatus has a punching die which has a boring punch (33) and a first cylindrical insert (35) fitted on the punch serving to open the bore (12). The boring punch has at its basal portion a tapered annular wall (34), and the cylindrical insert (35) having at its end surface an annular lug (36) capable of fitting in the annular groove. The tapered wall (34) radially expands an end of the pilot portion, so that its peripheral wall is forcibly slanted in a radial direction and an annular edge (13a) of the peripheral wall is stopped by an inner periphery of the annular lug (36).

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 metal rod (20) having a conical or pyramidal cut extremity (20a) is used to make a mandrel for blind rivets. The rod is held in place between a pair of die segments (11) such that its end (26) of a preset length, including the tip protrudes from an upper surface (14) of the segments. Subsequently, a free intermediate portion of the swageable end (26) is axially compressed to form a mandrel head (27) by a punch (12) which has a lower face (17) parallel to the upper surface (14) of the segments with a conical or pyramidal recess (18) formed on the end. The free intermediate portion of the swageable end (26) swells radially outward to form the head (27) having a flat flange (31) from which the tip intrudes. The mandrel, which has the head formed uniformly without any eccentricity about the longitudinal axis of a mandrel body, can be produced inexpensively using a prior art nail manufacturing apparatus.

Abstract: An apparatus for automatically causing the end face of a self-piercing nut (N) to function as a punch for piercing a metallic panel (P) laid on a caulking die (1) so that the nut is fixed to the panel. The apparatus has a pair of gripping fingers (31, 32) attached to the opposite sides of the lower end of a striking punch (2), and has a workpiece butting leg member (25) extending in parallel with a vertical bore (4) formed through a slide guide (3). The leg member (25) is attached to and depends from the bottom surface of the slide guide (3), so that the punch (2) holding the nut (N) by means of the gripping fingers (31, 32) will penetrate the slide guide (3) and then descend along the leg member (25), until the nut punches and is secured to the metal panel (P). Thus, the self-piecing nut (N) can be fixed to any bent bottom of or any narrow recess in the metal panel (P).

Abstract: A driver bit adapted to engage in a recess of a recessed screw which recess is defined as a coaxial superimposition of two equilaterally triangular and cylindrical recesses each having arcuate vertices and arranged with a phase shift of 60.degree. about a center axis of the recessed screw to provide six engagable grooves and six driven vanes. The driver bit includes six driving vanes and six valleys, with each driving vane being shaped in conformity with each groove in the recess of the recessed screw, and with each valley being interposed between adjacent driving vanes and shaped in conformity with each driven vane in the recess of the recessed screw.

Abstract: A row feeder for distribution of nuts has: a guide passage (14) formed on a main unit (11) so as to receive a number of successively delivered nuts "N" in a series; a plurality of distribution passages (15) formed on the main unit and each extending from and perpendicular to the guide passage; stroking pushers (16) reciprocatable across the guide passage (14) so as to transfer the nuts "N" lying on it to the respective distribution passages (15); drivers (e.g., pneumatic cylinders) (17) causing the respective stroking pushers (16) to reciprocate; and individual feed chutes (13) respectively connected to the distribution passages (15). The row feeder further comprises a joint member (12) as a separate member in addition to the main unit (11), and the feed chutes (13) are secured to the joint member at given intervals between them.

Abstract: A concrete anchor has an anchor body 21, which is a rod-shaped member 22 having a male thread 23 and a striking head 24, both formed at one end of the member. This rod-shaped member 22 further has at its another end a cylindrical portion 25 so that slots 26 extend axially from an open end of the portion so as to provide expandible feet 27. Saw-toothed scratching tips 28 are formed to be acute ends of the expandible feet. A tapered plug 31 which is inserted in the cylindrical portion 25 has an annular recess 34 and a retaining shoulder 36, both formed between a large diameter portion and a root 35 of the tapered plug, with the annular recess providing a cavity to receive concrete scrapings, so that an impact applied to the striking head can provide a strong and effective retention force for the concrete anchor, and any cracks which may be produced around a hole holding the fixed anchor does not impair the retention force.

Abstract: A method of making an elongated mandrel having an end integral with a drill section, with the method including the steps of subjecting a single columnar piece of material to the heading process so as to make a blank N composed of the mandrel, a short stem having one end integral with the end of the mandrel and having a diameter D greater than a diameter of the mandrel, and a flange formed integral with the other end of the stem. The short stem is then cold forged to produce the drill section having end edges (7a) and (7b) facing the flange, and, subsequently, the drill section is trimmed so as to remove the flange together with a scrap resulting from the cold forging of the stem, in such a manner that the mandrel having the integral drill section can be mass produced from the single piece of raw material, efficiently at a reduced cost.

Abstract: A recessed screw having in its head a recess for engaging with a driver bit, with the recess being defined with curved engaging walls and radial or corner grooves. Each engaging wall is a portion of a conical surface slanted inwardly towards a bottom of the recess. Each corner groove extends outwards from the adjacent engaging walls in radial direction. A pair of vertical side walls, lying parallel with the recessed screw's axis define each corner groove. The driver bit has protrusions tightly fittable in the recess, which recess may be a superimposition of two square holes disposed symmetrically with a phase shift of 45.degree. around the axis so as to provide eight corner grooves. Each engaging wall may be formed at a place where the side walls intersect one another. The driver bit may comprise a shank and a bit portion which extends from the shank and formed with eight V-shaped grooves extending axially of the bit so that eight blades are defined each between the two V-shaped grooves.

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: Method and apparatus for making screw having a drill section and a reamer section, the drill section and the reamer section being shaped at one step of the process, wherein the upper portions of the reamer edges are crushed so as to be aligned with an equal thickness and length, thereby imparting equal fragility to the reamer edges.

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: 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.