Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
  • B23K7/10—Auxiliary devices, e.g. for guiding or supporting the torch

Definitions

• 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 autogenou 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 simultaneousl 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.
• 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.
• 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 cross ⁇ wise, 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.
• FIG. 1 is a perspective view of a steering apparatus for an au togenous cutting torch according to a first embodimen 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 cuttin both oval and circular holes both in curved and flat wall .
• Fig. 3 shows a detail of the steering apparatus as depicted in figures 1 and 2.
• a pipe P is to be provided with an oval hole 2 and supported on a stand, not shown.
• OKPL P is placed against a back stop' la 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.
• the autogenous cutting debris shall not remain inside the pipe.
• Fig. 1 sh " ows an autogenous cutting torch 3 and its mounting arrangement for this purpose.
• the end of arm 4 is fitted with a radial distance .or spacer element 4a to which is secured an auxiliary arm 4b, which is parallel to arm 4 and radially spaced from the extension of the axis of arm 4.
• the cutting torch 3 is mounted on the end of arm 4b s that its torch nozzle will be at a desired distance from the extension of the axis of arm 4 directed towards said extension of axis.
• Holder arm 4 is journaled to frames 5 and 6 to be rotatable around its axis and axially displaceable. However, the axial displacement can be locked e.g.. by means of a screw fitted in the inner rim of a bearing 8.
• Frames 5 and 6 are connected with each other by slide rods 7 which are axially slideably supported on the body 1 by means of slide bearings 7a.
• Frame 6 carries a transverse slide rod 9 which extends through a slide hole 11 in a slide element 10.
• An assembly 12 provided by a gear wheel and an arm mounted thereon, is arranged to be rotated around .a fixed vertical axle 13 by means of a small gear 17 driven by a motor 15 through a reduction gear 16.
• the arm of assembly 12 is articulated to slide element 10 by means of a pivot 14.
• the arm of said rotatable assembly 1.2 is provided with holes 18. so that the distance of pivot 14. from axle 13 can be selected.
• stepped adjustment it is naturally possible to use stepless slide adjustment in order to adjust the distance between axle 13. and pivot 14. r
• Holder arm 4 carries an intermediate element 19 through which arm 4 is displaceable and lockable in a desired position.
• the intermediate element 19 and the inner rim of bearin 8 can be connected to each other so that they both can be locked on arm 4 at the same time.
• the cooperation between the intermediate element 19 and the slide element 10 will be further described hereinbelow with reference made to fig. 3.
• the intermediate element 19 is fitted wit a lever arm 20 extending through aii adjustment element 22.
• the adjustment element 22 can be locked at a desired level on pins 21 projecting from the slide element 10.
• the adjustment element 22 is provided with a cylinder member 23 which is turnable around the longitudinal axis and through which the lever arm 20 is slideable.
• axle 13 and pivot 14 determines the length of the major axis of an oval hole 2.
• the level of adjustment element 22 determines- the turning angle of arm 4 or the width of hole 2. While the nozzle of an autogenous cutting torch 3 travels along the desired oval.path, the cutting flame is lit and the hole is run.
• Fig. 2 shows a further development of the invention for cutting holes both in curved and flat surfaces and also in combinations of flat and curved surfaces.
• the sliding sleeves 7a of slide rods 7 are mounted on a cradle 24 which is displaceable on slide guides 25 in a direction perpendicular to arm 4. if the movement of cradle 24 on slide rods 25 is locked, the operation complies with the case illustrated in fig. l and the apparatus can be used, as explained, to work an oval hole in the wall of a pipe P. However, if cradle 24 is released to travel on slide rods 25 and, in addition to this, the movement of slide element 10 on slide guide 9 is locked, it is possible to make circular holes in a flat sheet.
• the embodiment shown in fig. 2 can be used to cut circular holes in a flat sheet without a template, e.g. for making annular flanges and, by means of a template, shaped pieces of a desired pattern or outline.
• the transverse slide guides 25 are mounted on a cradle unit 26 supported on a transverse slide guide unit 28 which, in effect, provides the actual fixed body for the apparatus; '
• said cradle ' unit 26 in arranged to move along the slide guide unit 28 e.g. over a hole distance 29, which corresponds to the distance between the pieces to be cut off the sheet.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Arc Welding In General (AREA)
• Turning (AREA)
• Butt Welding And Welding Of Specific Article (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8514695

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (6)

Citations (8)

Family Cites Families (3)

• 1981
  • 1981-09-14 FI FI812851A patent/FI67671C/fi not_active IP Right Cessation
• 1982
  • 1982-09-13 WO PCT/FI1982/000035 patent/WO1983001026A1/en not_active Ceased
  • 1982-09-13 JP JP57502815A patent/JPS58501461A/ja active Pending
  • 1982-09-13 US US06/483,947 patent/US4455015A/en not_active Expired - Fee Related
  • 1982-09-13 DE DE19823249170 patent/DE3249170C2/de not_active Expired - Lifetime
• 1991
  • 1991-06-18 JP JP1991045751U patent/JPH0490170U/ja active Pending

Patent Citations (8)

Also Published As

Similar Documents

Legal Events