Metallurgical apparatus – Means for cutting solid metal with heat – e.g. – blowpipes – With means for cutting tubular workpiece
Patent
1983-03-21
1984-06-19
Stallard, W.
Metallurgical apparatus
Means for cutting solid metal with heat, e.g., blowpipes
With means for cutting tubular workpiece
266 55, 266 70, 266 72, B23K 702, B23K 704
Patent
active
044550154
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a steering apparatus for an autogenous cutting torch for cutting a hole of desired shape in a wall, such as the wall of a pipe or a flat sheet, said steering apparatus comprising a holder arm for the autogenous cutting torch and means for steering the holder arm so as to guide the autogenous cutting torch along a certain desired path.
Previously known is to autogenously cut out pieces of a desired template shape from a flat sheet by employing a steering device, wherein a magnetic roller rolls along the edges of a template having desired shape while simultaneously carrying the holder arm of an autogenous cutting torch. A drawback of this steering device is that it is only capable of cutting flat or planar sheets. However, there is a need to cut holes of various sizes both in curved wall surfaces and in the combinations of curved and flat surfaces. One example of this is cutting of an oval hole in the side of a pipe when the purpose is to form a collar for a branching joint by pulling the hole edges upwards. In this case, the hole to be cut must be oval longitudinally of the pipe in order to bring edges of the eventual collar essentially onto the same level. Another not eworthy example is cutting of check gates or manholes in the side of containers of various shapes, whereby the wall to be cut can be partially flat and partially, e.g. at its edges, curved. Heretofore, there has not been available a steering apparatus for an autogenous cutting torch, which would be suitable for cutting holes of desired shapes both in flat and curved wall surfaces.
An object of the invention is to eliminate this drawback and, according to the invention, this has been accomplished by means of a surprisingly simple design of a steering apparatus. A steering apparatus of the invention is characterized in that the holder arm consists of an elongate holder bar mounted for axial displacement on a slide control, the motion of an autogenous cutting torch crosswise relative to the holder arm being effected by means of steering elements engaging the holder arm at a distance from the autogenous storch, said elements rotating the holder arm around its longitudinal axis and/or displacing the holder arm crosswise, supported by a slide control perpendicular to the above-mentioned slide control.
The essence of a solution of the invention is thus the use of an elongate holder arm, said holder arm being selectively or as various combinations settable in (1) controlled axial movement, (2) rotating motion dependent on axial movement, and (3) movement perpendicular to axial direction.
The invention will now be illustrated in more detail by means of work examples with reference made to the accompanying drawings, in which
FIG. 1 is a perspective view of a steering apparatus for an autogenous cutting torch according to a first embodiment of the invention for cutting an oval hole in a pipe.
FIG. 1A shows an alternative mounting of an autogenous torch for cutting an oval hole in the outer face of a pipe.
FIG. 2 shows a further developed embodiment capable of cutting both oval and circular holes both in curved and flat walls.
FIG. 3 shows a detail of the steering apparatus as depicted in FIGS. 1 and 2.
Referring to FIG. 1, a pipe P is to be provided with an oval hole 2 and supported on a stand, not shown. The end of pipe P is placed against a back stop 1a extending from the body of a steering apparatus 1. An autogenous cutting torch 3 is mounted on the end of a holder arm 4 provided by an elongate rod, so that the radial distance of a torch nozzle from the axial extension of holder arm 4 is adjustable for adapting the apparatus to various pipe diameters.
FIG. 1 shows cutting of an oval hole in a pipe from the interior of the pipe. Thus, the autogenous cutting debris shall not remain inside the pipe. However, it is often preferable and, when dealing with small pipes, for practical reasons necessary to effect the cutting from the exterior of a pipe. FIG. 1A shows an autogenous cutting torch 3 and its mounting arrangement f
REFERENCES:
patent: 2182707 (1939-12-01), Shipman
patent: 2583002 (1952-01-01), Maxon, Jr.
patent: 2910289 (1959-10-01), Grubish
patent: 3451666 (1969-06-01), Evans
patent: 4256288 (1981-03-01), Rojas
patent: 4265430 (1981-05-01), Eriksson et al.
patent: 4411410 (1983-10-01), Sumner
Larikka Leo
Stallard W.
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