Abstract: A rethreading die for clamping over a section of threaded rod is formed of two separable identically die section halves. Each die section has one-half of an outer gripping surface and an inner abutment face formed of identically shaped spaced first and second face sections in a common plane. One face section has a perpendicular alignment pin and the second face section has a perpendicular recess. The first and second faces are spaced and in a common plane. The die sections are joined together with the pin-containing face of each die section abutting the recess-containing face of the other die section so that the pins are inserted into the recesses to hold the die sections in alignment. A die tool is then clamped around the die surface, so that the die can be rotated over the damaged rod section to repair the threads.

Abstract: There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; a cutting blade (6), having a rear end hingedly articulated to the body (2), and a front end in the shape of a cutting face (46) substantially fitting the type of thread to be repaired; a guide blade (7) having a rear end hingedly articulated to the body (2), and a front end substantially fitting the type of thread to be repaired, the guide blade projecting beyond the cutting face of the cutting blade, and; means (10, 12, 14) to alter the distance between the front ends and the projecting body portion (4) to accommodate screws of different diameters.

Abstract: A method and apparatus are provided to machine a curved surface such as an inner or outer peripheral surface of a pipe. The pipe is held stationary during machining and a rotatable spindle of a machine head moves along multiple orthogonal axes to align the rotational axis of the spindle with the longitudinal pipe axis. Preferably, the pipe axis is located by using a touch probe to engage the curved surface at multiple spots and the calculating the location of the pipe axis. The cutting tool, which is preferably a cutting tool insert, is rotated by the spindle to machine the curved surface.

Abstract: There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; two blades (6, 6?), each having a rear end (32, 32?) hingedly articulated in the body (2) and front end in the shape of a cutting face (46, 46?) substantially fitting the type of thread to be repaired: means (10, 12) to alter the distance between the cutting faces (46, 46?) and the projecting portion (4) to accommodate screws of different diameters, and wherein the rear ends (32, 32?) of the blades (6, 6?) are configured in such a way that they are capable of serving as pivots, whereby the blades (6, 6?) are hingedly articulated to the body (2).

Abstract: A thread tapping device has a main seat, a rotating head, a handle rod, an adjustment rod, a pivot connector, and a pair of scrape blades. The main seat has a V-shaped groove, a bottom pivot hole, a through aperture, two connection bars, and an end block. The rotating head is disposed on the handle rod and inserted in the bottom pivot hole of the main seat. The adjustment rod has an upper lug and an outer threaded portion inserted in the rotating head. The pivot connector has a round aperture, a circular aperture, and a lower groove to receive the upper lug of the adjustment rod. Each scrape blade is disposed between the end block and one of the connection bars.

Abstract: A roller tool for forming an outwardly projecting ridge in a pipe, which tool is usable with the chuck or power head of a conventional pipe working machine, and a carriage suitable for mounting the roller tool and other tools on the pipe working machine. The roller tool has a female roller rotatably supported on a movable frame. The frame is fixed to the carriage, which in turn is pivotally mountable on the carriage supporting rails of the pipe working machine. One rail is fully encircled by a closed socket formed in the carriage, so that the roller tool cannot spontaneously disengage from the host pipe working machine. The other rail is partially encircled by an open socket formed in the carriage. The roller tool can pivot about the closed socket between an operational position and a standby position enabling the grooving machine to be utilized for grooving with the roller tool still attached.

Abstract: A thread repair tool and method of manufacturing are disclosed, along with a method for repairing damaged threads of a bolt, stud, or the like. The thread repair tool includes a pair of chaser sections each having a threaded inner diameter to match the threads of the bolt or stud to be repaired. Each chaser section has a tapered outer diameter and a longitudinal keyway in the tapered outer diameter. A driver is provided in which its inner diameter is tapered to match the outer diameter of the chaser sections. The tapered driver and chaser sections are locked together with a pair of keys, and the arrangement provides positive, force transferring engagement between the driver, the chaser sections, and the bolt or stud. The arrangement translates longitudinal pressure applied to the driver into radial pressure forcing the chaser sections tightly against the bolt or stud to be repaired.

Abstract: A device for cutting threads into an unthreaded end of a shaft member has a cutting blade support member mountable on a first side of an elongate frame, an adjustably moveable shaft support mountable on a second end of the elongate frame in opposed relation to the cutting blade support member, and means for adjustably moving the shaft support member between a shaft clamping position and a shaft releasing position. The cutting blade support member has cutting blades in radially spaced apart relation depending therefrom, the radially spaced arrangement so as to engage the cutting blades tangentially with a shaft held between the cutting blades and the shaft supporting member when the shaft supporting member is in the shaft clamping position. The elongate frame rigidly supports the cutting blade support member and the shaft support member in opposed relation when the shaft is clamped therebetween.

Abstract: A portable, handheld, power tool is operable to rotate a tap in an opening in a workpiece to form an internal thread convolution in the opening. The power tool includes a chuck which holds the tap. Left and right handles extend in opposite directions from the chuck and are connected with a housing. A motor is disposed in one of the handles and is connected with the chuck by a drive mechanism. Manual actuation of a motor control lever mounted on the one handle initiates operation of the motor. Upon operation of the motor, force is transmitted through a drive mechanism to the chuck to rotate the chuck and the tap. Upon interruption of operation of the motor, the tap may be rotated under the influence of force which is manually applied to the handles.

Abstract: A die holder assembly mounts to a conventional lathe for holding a die to facilitate cutting of a thread into a workpiece. The die holder rotatably rides along an alignment shaft which mounts to the chuck of the lathe. The die holder may be manually turned by applying torque via a lever or a wrench while the alignment of the received die is constantly maintained in relation to the workpiece.

Abstract: A hand-held tool is provided for applying threads to an earring post, to enable the earring post to thereafter receive a clutch member in a non-slip relationship. This novel tool comprises an elongate member of generally cylindrical configuration, around one end of which a cap member may be removably secured, such as by the use of interfitting threads. The one end of the elongate member defines a flat recess of circular configuration designed to receive therein, a flat circular die equipped with centrally disposed female threads. The recess is slightly shallower than the thickness of the die, and the die is preferably held in a non-rotative position in the recess by the internally threaded cap being tightened into firm contact with the threaded end of the elongate member. The cap member has a centrally disposed hole therein, into which an earring post may be inserted, and thus be brought into contact with the female threads of the die.