Abstract: A rotary cutter for cutting damaged threads of a bolt includes a body rotatable about a rotating axis. The body includes an inner periphery delimiting a conic cutting space. The body further includes at least one cutting blade, an evasive groove, an evasive portion, a scrap discharge groove, a scrap guide groove and a scrap discharge orifice on the inner periphery delimiting the cutting space. The at least one cutting blade forms a ridge. The evasive groove and the scrap discharge groove are respectively located on a rear side and a front side of the at least one cutting blade along a circumferential direction of the inner periphery of the body. The scrap guide groove extends between the evasive groove and the scrap discharge orifice.

Abstract: A method of producing a mine roof bolt includes: providing a plurality of bars of a predetermined length, moving the plurality of bars along a conveyor and indexing the position of the plurality of bars, and passing a portion of each of the bars through a processing station, where the processing station comprises at least one of a header assembly, an extruder assembly, and a threading assembly. The method further includes processing a portion of each of the bars with the processing station. A system for producing a mine roof bolt includes a conveyor configured to index and transport a bar, a feed arrangement configured to continuously deliver bars to the conveyor, a processing station comprising at least one of a header assembly, an extruding assembly, and a threading assembly, where the processing station is positioned along the conveyor and configured to receive and process a portion of the bars.

Abstract: Embodiments of the present invention comprise methods and apparatuses for manufacturing dual-threaded bolts. The invention comprises utilize rolling dies having one die with coarse thread projections over a surface of the die and fine thread projections over another surface of the die. In some embodiments, the surfaces on which the coarse thread projections and the fine thread projections are located are distinct from one another, or in other embodiments a portion of the surfaces may overlap or be formed integrally within the other projections. In some embodiments a portion of, or all of, the coarse thread projections may be located on a first die section piece while a portion of, or all of, the fine thread projections may be located on separate second die section piece (e.g., an insert) that is operatively coupled to the first die section piece.

Abstract: A die for roll forming threads on a cylindrical blank includes a planar die body having a longitudinally elongate working face of sufficient length for the blank to make multiple revolutions across the face. A plurality of thread forming elements on the face. The thread forming elements are spaced apart longitudinally of the die working face an ever increasing distance, based on the actual rolling diameter of the blank with the spacing between the thread forming elements at the start end equal to the diameter of the blank and the spacing between the thread forming elements at the finish end equal to eighty-five percent of the final diameter of the thread formed on the blank. The thread forming elements on the working face of the die are equally spaced apart in a direction perpendicular to the longitudinal extent of the working face.

Abstract: The invention includes a method, and a component made according to the method having at least one thread pattern formed thereon from a stamping method. The invention includes a tubular member comprising a body having a wall formed from a wrapped sheet of stock to define an interior wall and an exterior wall, a seam in the wall defining a first and second end of the wrapped sheet of stock, and a thread pattern stamped on the exterior wall. The method comprises the steps of forming a blank from sheet of stock having a first surface. A thread pattern is formed onto the first surface while in a substantially sheet-like form. A bending operation then forms the sheet stock into a tubular member such that the thread pattern, located on the tube's external surface, is substantially aligned about its circumference.

Abstract: A fastener includes a connecting portion and a head portion coaxially connecting with the connecting portion. The head portion defines an engaging hole which includes a main engaging hole and one or more auxiliary engaging hole coaxial with the main engaging hole. A plurality of auxiliary engaging teeth are separately formed on an inner peripheral wall of the engaging hole, toward a central axis of the engaging hole of the head portion, thereby forming the auxiliary engaging hole. A plurality of main engaging teeth are coaxially formed on the auxiliary engaging teeth, toward the central axis of the engaging hole respectively, and are positioned at the base of the engaging hole. The fastener provides two bearing surfaces on which a driver can act upon, and the present disclosure further provides the driver to engage with the fastener and a punch for producing the fastener.

Abstract: A bolt thread damage prevention assembly for minimizing thread damage to produced and packaged bolts includes a bolt production assembly, threaded bolts produced by the bolt production assembly, and a bolt tray for receiving the threaded bolts. A drop pan holds the bolt tray. Oil is positioned in the drop pan and a plurality of air jets create turbulence in the oil in the drop pan. The bolt tray is perforated for permitting the oil to enter the bolt tray in a turbulent state. A distribution conveyor belt is positioned to drop the threaded bolts into the bolt tray while the bolt tray is positioned in the drop pan while the oil is in the turbulent state. A collection pan is provided for collecting threaded bolts from the bolt tray. A bolt tray transport assembly moves the bolt tray from the drop pan to the collection pan.

Abstract: A threaded element in the shape of a wire thread insert with a specific geometric design is disclosed. This threaded element contains, in particular, a narrowed helical winding of at least two helical winding sections that enclose one or a plurality of sequential secants. Based on this geometric design of the threaded element, a matched installation process is described.

Abstract: A method and apparatus are provided for the determination of a surface area of a fastener, such as a threaded fastener. Specifically, an image of the fastener is acquired, and the image is separated into at least two regions, for instance three regions, and the surface area of each region is determined. The surface areas determined for each region are summed to determine the surface area of the fastener.

Abstract: Various embodiments described herein provide a fastener system having straight walled driving surfaces that provides a reliable stick fit feature, while also improving stability of engagement between the system components. A feature of the new system is to allow engagement of existing standard straight walled drivers in the new system.

Abstract: Reduced material content fasteners are provided that have a reduced material content portion between working ends allowing the fastener to have less weight with equal or better break and torque strengths. Systems and methods are provided for manufacturing reduced material content fasteners that provide for cold working the initial material to reduce the material while work hardening the remaining material. The cold working is provided by rolls and/or dies.

Abstract: A threading machine for the end threading of long metal bars includes a peeler and a threader mounted co-axially on a spindle. The spindle is powered by a motor. A leading rod is attached to the clamping chariot. The leading rod includes the peeler opening and closing controller, and the threader opening and closing controller. The controllers are supported by a carriage set, and the threader is able to travel forward and backward. The peeler opening controller and threader opening controller are adjustable by moving them along leading rod to accommodate various thread length.

Abstract: In mounting a resin panel to a car body member, the car body member is provided with a car body member thread part, a portion of the resin panel corresponding to the car body member thread part is formed with a slot extending along a direction of allowance of thermal deformation of the resin panel, and the resin panel is mounted to the car body member using a fastener including: a threaded stem; a first large diameter part provided to one end of the threaded stem and insertable in the slot; and a fastener thread part provided at an end surface of the first large diameter part opposite to the threaded stem and screw-engageable with the car body member thread part.

Abstract: The present invention relates to apparatus and process for roll forming a fillet at the juncture of the shank and head of a pin type fastener. The process and apparatus can be preset to perform the fillet rolling at selected parameters and to monitor the parameters for providing parts with uniformly rolled fillets.

Abstract: A screw drive recess mold for forming screw drive recesses which has a body and a mold base. The mold base consists of four symmetrical fan-shaped protrusions and a center square protrusion. Four elongate rectangular hollow spaces are located in each of the middles between every two neighboring fan-shaped protrusions. A compound screw drive recess formed by this drive recess mold can be driven by various conventional drivers such as of a slot, of a Phillips (cross), of a square, of a cross-square, and of a Pozi. With the tailor made screw driver of this compound drive recess, the drive recess will be able not only to withstand high driving torques but also to securely retain the drive bit (the screw driver) within the recess.

Abstract: The present invention relates to a reciprocating type thread rolling apparatus and comprises a ram reciprocated by a crank shaft and fixing to one side thereof at least two moving dies, the other side of the ram being disposed along a single thread rolling pressure bearing block, and stationary dies adapted to pair with the moving dies for thread rolling, the stationary dies being the same in number as that of the moving dies and disposed to be opposite to the moving dies.

Abstract: A fastener forming apparatus comprises a positive stop that prevents workpieces from overshooting the end of a forming stroke. A workpiece transfer mechanism transfers one unformed workpiece at a time into a workpiece gripper and drives completed workpieces out of the workpiece gripper and onto an exit path. A compound hydro-pneumatic cylinder moves the gripper and one workpiece at a time downward on a forming stroke into contact with a rotating forming tool. A limit switch causes the reciprocator to reverse direction at the end of the forming stroke. The forming tool includes a tool adapter head that holds various forming implements such as cutting blades or drill bits. In one embodiment the forming tool is a groover apparatus that cuts circumferential grooves around fasteners. In this embodiment, the lower limit switch signals a controller to hold the reciprocator at the end of the forming stroke while the groover forms the groove.

Abstract: A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

Abstract: A hole forming apparatus comprises a workpiece transfer mechanism that transfers one unformed workpiece at a time into a workpiece gripper and drives completed workpieces out of the workpiece gripper and onto an exit path. A compound hydro-pneumatic cylinder moves the gripper and one workpiece at a time downward into contact with a rotating forming tool. The forming tool includes a tool adapter head that holds various forming implements such as cutting blades or drill bits. The head also accommodates broachers and reamers, in which case a precision logic control detects and rejects defective workpieces that have no holes to broach or ream. The apparatus may also include a positive stop that prevents workpieces from overshooting the end of a forming stroke.

Abstract: A header die for forming a self-tapping fastener blank provides die forming zones within which the blank is formed, the blank therby defining an odd number of lobes along a cross section taken perpendicular to its axis of rotation. The lobes define a relatively high out-of-round cross section along a tapered thread-forming zone, and a relatively low out-of-round cross section along the main body taken in a direction toward the drive head. Between the main body and tapered thread-forming zone is located an additional thread forming zone having an axial length of approximately one thread pitch and a cross section that conforms to the high out-of-round of the tapered zone. The maximum diameter (at the lobes) of the additional thread-forming section approximately matches that of the full-diameter main body section. A lower-diameter stabilizing section can be provided ahead of the tapered zone, adjacent the tip of the fastener.

Abstract: An adjustment device for use in the forging of small metal items, especially applicable to forging machines for the production of screws, rivets and the like, suitable to realise the rapid adjustment of the length of the shank of said small items, having a series of levers and rods articulated with one another or connected to the casing of the forging machine and moved by a shaft of the same through a cam (10) or the like, and a movable element (29), supported by the same casing and connected with one or more of the levers and rods.

Abstract: A fastener forming apparatus comprises a positive stop that prevents workpieces from overshooting the end of a forming stroke. A workpiece transfer mechanism transfers one unformed workpiece at a time into a workpiece gripper and drives completed workpieces out of the workpiece gripper and onto an exit path. A compound hydro-pneumatic cylinder moves the gripper and one workpiece at a time downward into contact with a rotating forming tool. A knurled ring is adjustably supported on a threaded portion of a lower piston of the hydro-pneumatic cylinder in a position to contact a stationary stop surface when the workpiece gripper and tool reach the end of the forming stroke, halting the downward motion of the workpiece. The ring also actuates a lower limit switch at the stationary stop surface which causes the reciprocator to reverse direction. The forming tool includes a tool adapter head that holds various forming implements such as cutting blades or drill bits.

Abstract: An apparatus for forming a slot in a semi-product of a bolt prior to thread formation includes a punch and a die mechanism. The die mechanism includes a tubular member, and an elongated die member formed integrally with a slot-forming plate which is located at a front end portion thereof and which has a uniform-thickness flat middle portion and two side portions that are wider than the middle portion. The semi-product can be compressed between the punch and the slot-forming plate of the die member in a central bore in a high-hardness block, which is fixed in the tubular member, to form the slot. Accordingly, the slot has a uniform-width middle portion and two end portions which are wider than the uniform-width middle portion. When threads are formed on the semi-product by means of a lathe, no projections are created in the uniform-width middle portion of the slot, thereby permitting a wedge-shaped end of a screwdriver to engage fittingly the uniform-width middle portion of the slot.