US2277472A - Scarfing torch - Google Patents

Description

March 1942- J. L. ANDERSON SCARFING TORCH Filed Feb. 23, 1939 R O T N E V m Patented Mar. 24, 1942 SCARFING TORCH James L. Anderson, Oloster, N. 1., assignor to Air Reduction Company, Incorporated, New York, N. Y., a corporation of New York Application February 23, 1939, Serial No. 257,941

14 Claims.

This invention relates to torches for removing surface metal from metal bodies by means of an oxygen jet or group of such jets directed at an acute angle against the heated surface. The process which removes surface metal in thismanner is generally known as scarfing.

One object of the invention is to provide an improved scarfing torch that directs a number of oxygen streams against the surface of a metal body, with the streams spaced close enough to remove the metal from touching or overlapping areas which preferably cover the entire width of the metal body.

Another object is to provide an improved hand torch with one or more bearing surfaces which are in such relation to the tip face of the torch that when the bearing surface is resting on the metal body to be scarfed. the tip face is at the correct spacing from the metal body and the one or more oxygen jet orifices at the desired angle to the surface to be scarfed.

Other features of the invention relate to preheating jet oriflces for heating the surface against which the scarfing jets are directed, and to the supply of air to support the secondary combustion of fuel-gas preheating flames, such as oxyacetylene flames.

With a multi-scarfing jet tip, the, preheating fiame jet orifices may be in a circle around each scarfing jet orifice, or they may extend in a semicircle either above or below the individual oxygen jets, or they may be located entirely above or below the scarfing jets.

With embodiments of the invention in which some or all of the preheating jets are located under the oxygen jets and the torch has a supporting bearing resting on the work, passages are provided for the entrance of air, such as lengthwise extending grooves in the bearing face.

Other objects, features and advantages of the invention will appear or be pointed out as the specification proceeds.

In the accompanying drawing, forming part hereof:

Fig. 1 is a side elevation of a scarfing torch embodying the invention.

Fig. 2 is an enlarged perspective view of one end of the tip shown in Fig. 1.

Fig. 3 is a sectional view taken on the plane 33 in Fig. 2.

Fig. 4 is a sectional view similar to Fig. 3 but showing a modified form of the invention.

Figs. 5-9 are fragmentary front views showing different locations of preheating jet orifices, Figs.

'7 and 9 being views of the faces of the tips shown in Figs. 3 and 4, respectively.

The torch shown in Fig. 1 includes a handle portion made up of a large tube II and two smaller tubes l2 and I3 connected into a rigid assembly by clamps l5 located at equally spaced points along the length of the tubes. These tubes are of such length that the operator's hands, when holding the torch, are beyond the region of intense heat generated by the scarfing. 4

An elongated block tip I1 is connected to the lower end of the tube II. The lower ends of the tubes l2 and I3 connect with atorch head l8 through which gas from these tubes flow into a mixer l9 connectedwith the block tip ll.

Oxygen for scarfing jets is supplied to the tip I! through the tube H, and the flow of gas in the tube II is controlled by a quick-acting valve that is normally held closed by a spring and is moved into open position by a lever 2| on the upper end of the handle portion of the torch.

Fuel gas, such as acetylene, and oxygen for preheating fiame jets are supplied to the torch tip through the tubes l2 and I3. respectively, and each of these tubes is equipped with a tum-cock 23. There are hose connections at the upper end of the tubes ll, I2 and I3.

The handle portion of the torch extends upward at anacute angle to the plane of the surface to be scarfed, and also extends rearwardly at an angle to the direction of intended travel of the tip so that as the operator views the progress of the scarfing operation from above he is a short distance back of the tip and out of the path of any molten slag that may be deflected from the body being scarfed.

Within the block tip I 'I there are two distributing chambers 25 and 26 (Fig. 3) extending lengthwise of the block. Oxygen is supplied to the larger chamber 25 by the tube l I, and an oxy-fuel gas mixture flows to the chamber 26 from the mixer I9.

The tip I! has an elongated face 28 and scarf ing jet orifices ,29 at spaced points along the length of the face 28. These orifices 29 are at the ends of passages 30 leading from the distributing chamber 25 in a direction preferably normal to the plane of the face 28.

There are a plurality of preheating flame jet orifices 32 opening through the face 28 under the respective oxygen jet orifices 29. These preheating flame jet oriflces 32 are at the ends of passages 33 leading from the distributing chamber 26.

The sides of the tip block I I contiguous with the long edges of the face 2. are beveled, and a shoe I4 is attached to the lower beveled side by screws 35. The bottom of the shoe 34 is preferably hardened or coated with a layer of stainless steel or hard facing material 3' that retains its hardness even when heated by contact with the hot surface of the metal body being scarfed. The bottom surface of the shoe I4 is at such an angle to the plane of the tip face N that the scarflng Jet passages SI are at the desired angle to the surface of the metal body to be scarfed when the shoe 34 is resting on the metal body 31 as shown in Figs. 3 and 4. Another correlation between the tip face and the shoe I4 is that the orifices in the tip face are at the correct spacing from the surface of the metal body when the tip is supported on the metal body by the shoe l4.

It is not necessary that the shoe 34 be separate from the tip II. The tip can be constructed so that it has an integral portion corresponding to the shoe 34. It is not necessary that the hearing surface or surfaces on the botttom of the shoe 34 be continuous, but it is a feature of the invention that the over-all distance from the forward to the rearward end of the bearing surface is long enough to make any tilting of the tip easily noticeable to the operator holding the handle portion. The longer the bearing which supports the torch on the surface of the metal body, the more evident any tilting which raises one end of the hearing will be. This is because the longer bearing produces a greater moment of the force or weight which holds the tip against the metal body and thus makes the operator holding the torch more conscious of the fact that he has tilted the torch, in the event that at any time he does hold the handle portion at such an angle that the tip is tilted out of the optimal position shown in Fig. 3.

For similar reasons it is desirable that the over-all width of the hearing be of substantial extent, and in the illustrated embodiment of the invention the shoe 34 extends for almost the entire length of the torch block.

Because of the relatively close spacing of the oxygen jet orifices 29, these scarflng jets form a dynamic curtain of oxygen above the preheating flames that issue from the orifices 32. This curtain cuts off the preheating jets from the air above them, and they do not get the necessary oxygen from the oxygen curtain because the kinetic energy of the scarfing jets prevents the oxygen from reaching the flame jets directly below.

In order to obtain air for supporting the secondary combustion of the preheating flames, passages are provided in the shoe 34. Figs. 1-3 show the shoe 34 with parallel grooves 38 in its bottom face. These passages can be formed by similar grooves in the top face of the shoe, by openings through the shoe, or by a clearance between the shoe 34 and the tip block i1.

Air is aspirated through the grooves or passages 38 by the preheating flame jets that issue from the orifices 32. It is not necessary that the grooves 38 extend in the direction shown in Figs. 1-3. These air passages may be angularly disposed, but it is a feature of the invention that they extend in a direction that has a component extending in the direction of the intended movement of the torch, so that air behind or on the sides of the torch can be aspirated into the space in front of the tip and under the curtain of oxygen formed by the scarfing jets.

Fig. 4 shows a torch tip 40 which has preheating flame Jet orifices 4! above the scarfins' oxygen jets instead of below. An oxy-fuel gas mixture, such as an oxyacetylene mixture, is supplied to the orifices 4| from a distributing chamber 42 through passages 43. The remainder of the tip 40 is similar to the tip ll shown in Figs. 1-3 and the same reference characters are used to indicate the corresponding parts.

, The jet passages 43 being located further above the surface of the metal body in the tip 40 (Fig. 4) than in the tip ll (Fig. 3) can be directed downward at a steeper angle toward the surface to be scarfed.

Fig. 5 shows a circle of preheating flame jet orifices 45 around each of the scarring oxygen Jets 2!. F18. 6 shows flame Jet orifices 46 located below the scarfing Jets and in a semicircle. The face of tip i1 is shown in Fig. 7. The preheating jet orifices 32 are shown located along short arcs below the scarilng jet orifices 29, but these preheating jet orifices may be located along a straight line.

Fig. 8 shows a semicircle of preheating flame jet orifices 48 located above each of the scarfing jet orifices 29.

The preferred embodiment and some modifications of the invention have been illustrated and described, but other modifications can be made and some features of the invention can be used without others.

I claim:

1. In a scarfing torch, a tip and a number of orifices in said tip from which oxygen jets are directed against a metal body to remove surface metal from the body, said orifices being spaced transversely of the direction of intended movement of the torch with respect to the metal body to be scarfed, said tip having a conduit through which oxygen is supplied to said orifices, and having other orifices from which fuel gas flame iets issue to preheat the metal surface to be scarfed, substantially all of said other orifices being located under the oxygen jet orifices, and a bearing on the torch for supporting said torch on the work.

2. A scarfing torch comprising a block tip with an elongated face and a row of Jet orifices in said face for directing scarfing streams of oxygen against the surface of a metal body, and supporting hearings on a side of the block at spaced regions along the length of the block for supporting the tip on the metal body in a definite relation to the surface of said metal body.

3. A scarfing torch comprising a block tip with an elongated face and a row of jet orifices in said face for directing scarfing streams of oxygen against the surface of a metal body, a supporting bearing on the side of the torch, and air passages in the supporting bearing extending in a direction to supply air to the region under the face of the tip when said tip is in working relation to the metal body to be scarfed and the supporting bearing is resting on the surface of said metal body.

4. A scarflng torch comprising an elongated block tip with a face and a row of scarfing jet orifices opening through the face at spaced regions along the length of the face, a bearing surface on the side of the tip at an angle to the plane of the tip face, said angle being the supplement of the angle that the plane of the tip ace makes with the surface of a metal body when the tip is in operating position on said metal body, and parallel grooves in the bearing surface extending across said surface to the edge of the bearing nearest the face of the tip.

5. In a hand scarfing torch with a plurality of orifices from which oxygen jets are directed against the surface of a metal body to be scarfed. means for guiding an operator in maintaining the torch in a given position with respect to the work, said means comprising a shoe attached to the torch and having a plane face in position to contact with an area of the surface of the metal body when the torch is disposed at an acute angle to the metal body and the orifices are at a predetermined spacing and angle with respect to the surface of the metal body, said shoe having a hardened bearing surface on the bottom constructed of material that retains its hardness and wear resistance at the temperature encountered on the heated surface behind the scarfing jets.

6. A scarfing torch comprising an elongated block with a plurality of large orifices opening through a face of the block for directing oxygen jets against the surface of a metal body to be scarfed, said orifices being spaced along the length of the block, and smaller orifices opening through said face of the block around each of said oxygen orifices and communicating with distributing passages through which fuel gas is supplied to the smaller orifices for preheating flames.

7. A'scarfing torch comprising a block tip having an elongated face with a row of orifices extending lengthwise of the face and from which scarfing jets of oxygen are directed against the surface of a metal body, and other orifices opening through said face and from which preheating fuel-gas fiame jets are directed toward the surface of the metal body, one or more of the preheating jets being located under each of the oxygen jet orifices.

8. A scarfing torch comprising a tip having an elongated face with a row of orifices extending lengthwise of the face and from which scarfing jets of oxygen are directed against the surface of a metal body, other orifices substantially all of which are above the oxygen jet orifices and directed downward toward the surface to be scarfed, and passages for supplying to said other orifices fuel gas for preheating flame jets.

9. A scarfing torch comprising a tip having an elongated face with scarfing jet orifices opening through said face for directing jets of oxygen against the surface of a metal body, said scarfing jet orifices being spaced apart in a row extending lengthwise of the face, preheating jet orifices also opening through the elongated face, substantially all of said preheating jet orifices being located on one side of the row of scarfing jet orifices and On that side which locates the preheating jet orifices on the side of the scarfing jet orifices away from the work when the torch is used with its intended orientation with respect to the work. and separate passages in the tip for supplying ox gen to the scarfing jet orifices and fuel gas to the preheating jet orifices.

10. A scarfing torch comprising a block tip having an elongated face and a bearing on one side by which the torch is supported on the surface of the metal body to be scarfed, jet orifices opening through said face at spaced points along the length of the face for directing scarfing jets of oxygen against, the metal body, preheating jet. orifices opening through the tip face under the omen jet orifices, and air passages through the supporting bearing for the supply of air to the preheating fiames under the oxygen jets.

11. In ahand torch for scarfing metal bodies, a torch tip in which are orifices for directing jets of gas against a metal body, and means for guiding an operator in maintaining the torch in a given position with respect to the work, said means comprising a supporting bearing on the torch, said bearing having a plane surface extending both transversely of, and in the direc= tion of the intended movement of the torch. the surface of said supporting bearing being at an acute angle to the jet orifices and so correlated with the jet orifices that when the bearing is in surface contact with a surface of a metal body, the jet orifices are in a predetermined angular relation for scarfing that surface of the metal body.

12. A torch comprising an elongated block tip having a face in which are a number of orifices at spaced points lengthwise of the tip face and from which scarfing jets of oxygen are directed against a work-piece, a supporting bearing on the torch, said bearing having a surface for supporting the torch on the workpiece the width of said bearing being substantially as great as the length of the tip face, and the length of said bearing at least half as great as the width, and having said surface so disposed with respect to the tip face that the jet orifices are at a predetermined spacing from, and inclination to, the surface to be scarfed when the supporting bearing is in surface contact with the work-piece, and a handle connected to the tip and extending beyond the end of the tip and upward at an acute angle to the plane of the surface to be scarfed.

13. A torch comprising a block tip having a face in which are a number of orifices spaced apart lengthwise of the tip and from which scarfing jets of oxygen are directed against a work-piece, a supporting bearing on the torch,

. said bearing having a plane surface area of substantial width and length for supporting the torch 0n the work-piece, and having said surface so disposed with respect to the tip face that the jet orifices are at a predetermined spacing from, and inclination to. the surface to be scarfed when said plane surface of the supporting bearing is in contact with the work-piece, and a handle connected to the tip and extending from the tip rea'rwardly at an acute angle to the direction of intended movement of the torch.

14. A hand scarfing torch comprising an elongated block tip having a face and a plurality of oxygen jet orifices opening through said face for delivering scarfing jets against a work-piece, said orifices being at spaced points along the length of the tip and close enough together to remove surface metal from overlapping areas of the work-piece, a supporting bearing on the torch with a surface in a fixed relation to the face of the elongated block and in such angular position with respect to said face that when the bearing is in surface contact with an area of the surface of a metal body the tip is in working relation to said body, arid a handle for moving the tip along the metal body to be scarfed.

JAIVIES L. ANDERSON.

D l S C L. A I M E R 2,277,472.-James L. Anderson, Closter, N. J. SCARFING TORCH. Patent dated March 24, 1942. Disclaimer filed September 11, 1943, by the assignee, Air Reduction Company, Incorporated.

Hereby enters this disclaimer to claims 2, 3, 4, 6, 7, and 10 of said patent.

[Qfivi Gazette October 12, 1943.]

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