Class 219/62 - Helical seam

Subclass of Class 219 - Electric heating
Definition: Subject matter in which the longitudinal bond or seam is
No. of patents: 21
Last issue date: 05/06/2008

Number	Title	Issue Date
7367796	Heating cylinder for attachment to an injection nozzle for an injection molding system A hollow heating cylinder for attachment to an injection nozzle for an injection molding system. An elongated heating cartridge is spirally wound on the outside of the cylinder. The heating cartridge contains two electrically heatable heat conductors which are elect...	05/06/2008
7236255	Method and instrument for measuring bead cutting shape of electric welded tube To precisely measure bead cutting shapes of electric resistance welded pipes without being affected by difference in luminance level between cut and uncut portions in optical cutting images, an image is obtained by overlaying an optical cutting image with the optica...	06/26/2007
7111770	Method for producing connecting ends on metal tubes and tube piece comprising such connecting ends Connecting ends on a hose piece comprising several metal layers, in particular a strip wound metal hose piece, are produced by fixing the overlapping metal layers of a hose of larger length or of an endless hose in the region of the point of separation through weldi...	09/26/2006
6998573	Transformer module for a welder An electric arc welder comprising a high switching frequency inverter for driving the primary of an output transformer where the output transformer has a plurality of modules forming the secondary windings of the transformer and each of the modules comprises a first...	02/14/2006
6875942	Methods and systems for fabricating spiral welded cylinders A method for forming a cylindrical body utilizing a continuous weld is provided. The method includes feeding a source material including a first edge and a second edge from a coil and offsetting at least one of the first edge and the second edge. The method further ...	04/05/2005
6732906	Tapered tower manufacturing method and apparatus Method and apparatus for the manufacture of large-diameter, elongated, generally conical members in a continuous operation. ...	05/11/2004
6717093	Methods and systems for fabricating spiral welded cylinders A method for forming a cylindrical body utilizing a continuous weld is provided. The method includes feeding a source material including a first edge and a second edge from a coil and offsetting at least one of the first edge and the second edge. The method further ...	04/06/2004
6279813	Cylindrical helical seamed tube and method and apparatus therefore A cylindrical helical seamed metal tube wherein the seam thereof is at an angle of between 1 and 25 degrees with respect to the axis of the tube. A method of making the tube comprises the steps of continuously feeding the metal strip into a tubing former ...	08/28/2001
6201207	Torch angle setting apparatus A torch angle setting apparatus includes vertical links arranged in a vertical direction, the respective lower end of which is supported on a frame so as to be pivotally rotatable, and coupled with horizontal links at an upper end and an intermediate posi...	03/13/2001
6166348	Finned tube The invention relates to a finned tube (1), a process for its manufacture and a device for performing the process. The process involves at least one endless strip (4), forming the fins, being wrapped around a rotating tube body (2) in roughly helical fash...	12/26/2000
5957366	Helically formed welded pipe and diameter control A helical weld servo controller for controlling the diameter of helically formed welded pipes adjusts the auxiliary hold down wheel position and the helix angle based on information provided by transducers regarding outgoing pipe diameter and by a laser v...	09/28/1999
5611143	Process for making chilled iron rolls A process for forming a chilled iron roll for a calender stack. An unfinished roll having a core volume forming the roll radial periphery is provided. An outer radial region of the core volume which has a first microstructure is remelted by passage of ele...	03/18/1997
4763830	Method for welding ribbed pipe A method is described for manufacturing helically formed pipe from strip material. One side of the strip material is formed to provide a first side flange that projects substantially 90° relative to the plane of the strip. The opposite side of the strip ...	08/16/1988
4645893	Method for manufacturing spiral-welded steel pipe In the manufacture of spiral-welded steel pipe, material strip or plate is fed in its longitudinal direction and continuously formed into spiral pipe form. One side-edge of the strip and the other side-edge of the strip that has already been spirally form...	02/24/1987
4621181	Method of manufacturing multilayer screw seam pipes and device for carrying out the method An improved method of manufacturing multilayer helical seam pipes from strips or bands lying loosely over each other to prevent porous welding seams due to heated air escaping from resultant gaps between the layers of strips, comprising feeding the strips...	11/04/1986
4381440	Control circuitry for producing variably rifled tubes An electrical circuit (102, 102') employable in cooperative association with welding means (90) for purposes of effecting the application of a weld deposited rib on the inner wall surface of a boiler tube (10), and through the use of which control is exer...	04/26/1983
4247033	Method of and device for producing multi-layer pipes A method of and device for producing multi-layer pipes by helically winding a plurality of bands loosely arranged one above the other, which are individually withdrawn from a supply, straightened out, trimmed, and in the form of a band loop are conveyed t...	01/27/1981
4082211	Method for fabricating tapered tubing Tapered spiral tube in continuous lengths is fabricated with an alternating increasing and decreasing diameter, the length being severed at the locus of change. The taper may be straight, convex or concave, the tube being produced from strip-stock which i...	04/04/1978
4063058	Apparatus for making seam welded tubing Apparatus for making seam welded tubing of the type comprising a first butt welding machine for joining together by submerged arc welding the adjacent ends of successive lengths of strip to form a continuous strip, a strip storing device for storing the c...	12/13/1977
3997098	Helically seamed tubing and apparatus and method for making same A thin perforate, helically wound welded edge tubing is used as a filter core for a roving wound filter. The slightly roughened external edges of the spirally formed welded joint greatly adds to the ability of securing the fiber roving to the tube and pre...	12/14/1976
3969170	Method for making a thermoplastic sleeve to be used as coupler fitting for tubes A thermoplastic coupler sleeve for interconnecting tubes or pipes is made by extruding thermoplastic material, e.g., polyethylene, to make a ribbon, and wrapping the ribbon around a heater coil in as many layers as needed to obtain the sleeve....	07/13/1976

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Class 219/62 - Helical seam