US2494627A

US2494627A - Apparatus for scarfing billets and the like

Info

Publication number: US2494627A
Application number: US760157A
Authority: US
Inventors: Reidar J Nicolaisen
Original assignee: Air Reduction Co Inc
Current assignee: Airco Inc
Priority date: 1947-07-10
Filing date: 1947-07-10
Publication date: 1950-01-17
Anticipated expiration: 1967-01-17

Description

Jan. 17, 1950 J, NICQLAISEN 2,494,627

APPARATUS FOR SCARFING BILLETS AND THE LIKE Filed July 10, 1947 s Sheets-Sheet 1 INVENTOR REIDAR J. NICOLAISEN ATTORNEY? Jan, 17', 1950 R. J. NICOLAHSEN 2,494,627

APPARATUS FOR .SCARFING BILLETS AND THE LIKE Filed July 10, 1947 3 Sheets-Sheet 2 INVENTOR REIDAR J. NICOLAISEN ATTORNEYJ 1950 R. J. NICOLAISEN 2,494,527

APPARATUS FOR SCARFING BIL-LETS AND THE LIKE Filed July 10, 1947 3 SheetS-Sheet 3 HG. 6 ZLWA 5:4 M

Aa/J INVENTOR L REIDAR J. NICOLAISEN Patented Jan. 17, 1950 APPARATUS FOR SCARFING BILLETS AND THE LIKE Reidar J. Nicolaisen, New York, N. Y., assignor to Air Reduction Company, Incorporated, a corporation of New York Application July 10, 1947, Serial No. 760,157

8 Claims. (Cl. 266-23) This inventionrelates to apparatus for scarfing or desurfacing ferrous metal bodies, and more particularly to apparatus for simultaneously scarring all four faces of billets, blooms, slabs, and other work-pieces of rectangular cross-section.

Scarfing machines have already been proposed for simultaneously scarfing all four faces Of a billet or the like in which four scarflng heads are adjustably mounted so that a succession of workpieces of the same or different cross-sectional dimensions can be scarfed. However, in some of the machines previously proposed it is necessary to position one pair of adjacent scarflng heads in a different plane from the other pair so that the heads will not strike or interfere with one another when they are moved inwardly from their positions for scarfing a work-piece of maximum size ,to their positions for scarfing a smaller workpiece. In other machines rather complicated mechanism is required to provide for the various movements the scarfing heads must have when they move into operative relation with the workpiece and when they accommodate themselves to work-pieces of difi'erent cross-sectional dimensions, and even so, the danger of the scarfing heads striking or interfering with one another when they are so moved is not completely avoided.

Another disadvantage of the'previously proposed scarfing machines is that certain movements of the scarfing heads are provided for by guideways, and by slides mounted to move rectilinearly in them. The proper functioning of such parts is more likely to be interfered with by the accumulation of dirt and slag from the scarfing operations than pivoted connections.

One object of this invention is to provide improved scarfing apparatus adapted to simultaneously scarf all four faces of metal bodies of rectangular cross-section and of various crosssectional dimensions, and having scarflng heads or scarfing tips so mounted that they can always be moved without interference between them into an operative position with respect to the workpiece even though they may at times lie in the same general transverse plane.

Another object is to provide scarfing apparatus adapted to simultaneously scarf all four faces of a work-piece of rectangular cross-section in which all movements of the scarfing tips which cause them to accommodate themselves to workpieces of various cross-sectional dimensions are provided for by pivotal connections as distinguished from connections of the sliding type.

A further object of the invention is to provide scarfing apparatus adapted to simultaneously scarf all four faces of work-pieces of rectangular cross-section and of various cross-sectional dimensions which is simpler in construction than 2 apparatus previously proposed for the same purpose.

Scarfing apparatus embodying the invention is illustrated in the accompanying drawings, in

which:

Figure 1 is a plan view of the apparatus;

Fig. 2 is a side elevation of the apparatus shown in Fi 1;

Fig. 3 is an end elevation of the apparatus shown in Fig. 1 drawn to a larger scale and viewing the apparatus from the left in Fig. l, i. e., viewing it toward the discharge faces of the scarfing tips; and

Figs. 4, 5 and 6 are diagrammatic views show- I ing the positions assumed by the scarflng tips and their associated parts when scarfing work-pieces of different cross-sectional dimensions.

, The scarfing apparatus in its preferred form comprises a base l0 (Figs. 1 and 2) and a superstructure mounted thereon having a portion H which overhangs the base and extends transversely over the conveyor rolls |2 Of a mill table on which a work-piece W to be scarfed (Figs. 2 and 3) such as a billet, slab, or the like, is supported and fed through the scarflng apparatus in the usual way. An arm l3 depends from the portion H of the superstructureiFigs. 1 and 2) and A pair of tip arms are pivotally mounted in each of the carriers H and IS. The two tip arms that are mounted in the carrier l4 are shown at 2| and 22 in Fig. 1 and the two that are mounted in the carrier 5 are shown at 23 and 24in this figure. Each of the tip arms is mounted in its carrier to pivot about a horizontal axis 25 (Fig. 2). Thus the forward end of each of the tip arms is movable vertically. The tip arm 2| is operatively connected to the piston of a fluid cylinder 26 adapted when supplied with motive fluid such as air to lift the forward end of the arm and swing it about its horizontal pivot axis 25. Weights 2'! supported by the rear end of the tip arm 2| counterbalance a portion of the weight of the forward end of the arm and reduce the load imposed on the hydraulic motor 26. When the motive fluid is discharged from the cylinder amass? fluid cylinders for the

tip arms

22, 23 and 23 are shown at 29, 30 and 3|, respectively, in Fig. 1. However, the fluid cylinder 23 associated with the tip arm 22 may remain idle or entirely disconnected, if desired, since the forward end of this tip arm can, and preferably is, raised when necessary by connections with the tip arms 2| and 23 when the forward ends of these arms are raised as will hereinafter more fully appear.

The forward end of the tip arm 2| carries a rigid tubular member 32 which extends transversely of the apparatus and transversely over the work-piece W. This member is secured to the tip arm 2| by means of a clamp 33 (Fig. 3) attached to the tip arm by bolts 36. Keys 35 prevent the clamp from turning on the tip arm. The upper horizontal torch tip T1, i. e. the one that is intended to scarf the top face of the workpiece, is connected to the tubular member 32 by means of brackets 36 attached to a plate 31 which in turn is secured to the torch tip by bolts 38. In Fig. 3 the other torch tips are shown at T2, T3 and T4, the tips T2 and T4 being the vertically disposed tips for scarflng the: vertical side faces of the work-piece and the tip Ta being the other horizontal tip for scariing the bottom face of the work-piece.

The forward end of the tip arm 23 carries a member 39 which extends transversely of the ap paratus and transversely under the work-piece W as shown in Fig. 3. This member is secured to the tip arm 23 by a clamp iii attached to'the tip arm by bolts ll. The Keys 52 prevent the clamp from turning on the tip arm. The transversely extending member as supports the horizontal tip T3 for scarflng the bottom face of the work-piece.

The torch tip T2 is attached to the forward end of the tip arm 22 by a clamp 33 secured to the tip arm by bolts i l and prevented from turning on the arm by means of keys 35. A retaining plate 36 connects the torch tip to the clamp 43.

In a similar manner, the torch tip T4 is secured to the forward end of the tip arm 26 by means of a clamp i attached to the: tip arm by bolts 48 and prevented from turning on the tip arm by Keys 39.

Referring to Figs. 1 and 2.. lever arms 30 and are secured, respectively, to the rear ends of tip arm carriers l4 and l5. The rear ends of the lever arms 50 and 5| are operatively connected to the pistons of

fluid cylinders

52 and 53, respectively, (Fig. 1). These fluid cylinders are double-acting. When motive fluid such as air is admitted to the rod end of the cylinder 52, the carrier M in which the tip arms 2| and 22 are mounted is moved about the axis of its pivot pin in a direction such that the forward end of the carrier moves outward away from the work-piece, and when motive fluid is admitted to the head end of the cylinder the carrier is moved in the opposite direction to move its forward end inward toward the work-piece. The other carrier I5 in which the other two tip arms 23 and-24 are mounted is moved in a similar manner by admitting air or similar motive fluid to the rod end or the head end of the fluid cylinder 53. The tip arms 2| and 22 being mounted in the carrier ll partake of its movement about its pivot pin 20, and similarly, the

tip arms

23 and 24 being mounted in the carrier l5 move with it when it is swung about its pivot pin. Therefore, it will be seen from Fig. 3 that when the forward end of the carrier M moves horizontally in either direction the forward ends of the two tip arms 2| and 22 will move horizontally in unison and the two torch tips Ti and T2 carried by them will also move horizontally in unison. In other words, the horizontal distance or relationship between the torch tips T1 and T2 never changes. However, since the forward ends of the tip arms 2| and 22 can be moved vertically independently of each other, the torch tips T1 and T2 can also be moved vertically independently of each other. Similarly, when the forward end of the carrier i5 is moved horizontally, the forward ends of the

tip arms

23 and 24 will be moved horizontally in unison and the tips T3 and T4 carried by them will also move horizontally in unison. Thus the horizontal relationship between the tips T2 and T4 never changes although each tip can be moved vertically independently of the other because the forward ends of the

tip arms

23 and 26 are independently movable in a vertical direction.

A stop arm 54 extending upward from the tip arm 24 abuts at its upper end against a plate 55 on the under surface of the tubular transverse member 32. The stop arm is of such length that the forward end of the tip arm 26 can never approach the transverse member 32 close enough to cause the upper end of the tip T4 to strike the left end of the tip T1 in Fig. 3 when there is relative horizontal movement between the two tips. When the forward ends of the tip arms 2| and 22 are moved horizontally relative to the forward ends of the

tip arms

23 and 2%, thereby causing relative horizontal movement between the transverse member 32 and the stop arm 5 the upper end of the stop arm slides on the plate 55, or vice versa. A similar stop arm 56 extends downward from the forward end of the tip arm 22 and abuts at its lower end against the upper surface of the lower transverse member 39. Thus the forward end of the tip arm 22 can never approach the transverse member 39 close enough to cause interference between the lower end of the tip T2 and the right end of the tip T3 in Fig. 3 when these two tips are moved relatively in a horizontal direction. When there is relative horizontal movement between the forward end of the tip arm 22 and the transverse member 39, the lower end of the stop arm 56 slides on the upper surface of the member 39, or vice versa.

A stop device 51 is secured to the clamp ll and cooperates with the stop arm 54 to limit the approach of the two

transverse members

32 and 39.

A member 58 (Fig. 3) is attached to the clamp 33 by the clamping bolts 34 and projects inwardly far enough to engage the clamp 43 when the forward end of the tip arm 2| is moved upward by its fluid cylinder from the position shown in Fig. 3 to a position in which the lower right corner of the tip T1 is about even with the upper left corner of the tip T2. This position of the parts is shown in Fig. 4. Further upward movement of the tip arm 2| to the neutral position hereinafter described will move the tip arm 22 along with it to the latters neutral position. Thus, movement of the tip arm 2| to its neutral position moves both the torch tip T1 and the torch tip T2 to the upper limit of their vertical movement. Similarly, a member 59 (Fig. 3) at tached to the clamp 40 by the clamping bolts 4| projects inward far enough to engage the clamp 41 when the tip arm 23 moves downward from the position shown in Fig. 3 far enough to bring the upper left corner of the tip T3 about even with the lower right corner of the tip T4 as shown in Fig. 4. Further downward movement of the tip arm 23 then moves the tip arm 24 downwardauger? ly along with it, thus moving both the torch tips '1: and T4 to the lower limit of their vertical movement.

The torch tips may be of any suitable type, the particular ones shown in the drawings being of the block type having a row of drilled jet passages from whose discharge orifices the scarfing oxygen jets issue. In Fig. 3 the tips are viewed in a direction looking toward their discharge faces. The discharge face of each tip is shown at M in Figs. 1, 2 and 3 and the discharge orifices from which the scarflng oxygen jets issue are shown at 62. The scarfing jets are projected at an angle against the corresponding surface of the work-piece to scarf or desurface it thermochemically when the surface metal is at kindling temperature, as is well understood in the art. Each torch tip may also be adapted to project preheating flames from the discharge face of the tip onto the surface of the work-piece to heat the surface metal to kindling temperature. While the portions of the torches from. which the scarflng jets and the preheating flames issue have been referred to as scarfing tips it should be understood that this term is used to apply also to so-called scarfing heads having a row of individual nozzles through which the scariing jets issue instead of passages drilled directly in metal blocks.

The various pipes, conduits, and hoses usually employed for conducting the scarflng oxygen, the preheating gases, and the cooling fluid, to the torch tips have not been shown in the drawings for the sake of clarity.

The scarfing operation may be controlled remotely in accordance with conventional practice by solenoid valves, electric switches etc.--none of which have been shown in the drawings be cause they form no part of the invention. Moreover, the piping system for conducting motive fluid to and from the fluid cylinders, and the control system for the fluid cylinders, have not been illustrated. Any suitable control system for them may be used whereby the fluid cylinders may be separately or simultaneously controlled, or controlled in any desired combination.

The neutral position of the parts is not shown in the drawings but it is the position assumed by the parts when the forward ends of the tip arms 2! and 22 are in their highest and outermost position and the forward ends of the tip arms 23 and 2d are in their lowest and outermost position. In other words, the forward ends of the tip arms 2| and 22 and the pair of torch tips T1 and T2 would be in a higher and more outward position than shown in Fig. 4 and the forward ends of the tip arms 23 and 2t and the pair of torch tips T: and T4 would be in a lower and more outward position than shown in this figure. Ample passage is then provided for introduction of the end of the work-piece into the expanded opening between the torch tips. The torch tips are moved to neutral position after each scarfing operation. Now assuming that the work-piece W in Fig. l is a work-piece of the maximum size that the apparatus is adapted to scarf, and that it has been fed into the scarfing apparatus far enough for its forward end to be in operative relation with the torch tips when they are moved inwardly against it, motive fluid is admitted to the head end of the

cylinders

52 and 53 to swing the tip arm carriers inwardly, and motive fluid is also admitted to the cylinders 30 and ill to raise the forward ends of tip arms 23 and 2t, and the motive fluid is released from the cylinder 28 to allow the forward ends of tip arms I! and 22 to descend by their own weight. The fluid cylinders may be operated in this manner either simultaneously or successively. In any event the result is that the two pairs of scarfing tips, i. e., the pair T1 and T2 and the pair T3 and T4, are moved horizontally inward until the tip T2 engages the right vertical face of the work-piece as viewed in Fig. 4 and the tip T4 engages the left vertical face of the work-piece. The downward movement of the forward end of tip arm 2| lowers the upper horizontal tip T1 until it rests on the top face of the work-piece, and the raising of the forward end of the tip arm 23 brings the lower horizontal tip Ta against the bottom face of the work-piece. The tip T4 will be raised by its tip arm 2t until the stop 54 abuts against the transverse member 32 on the tip arm 20. This stop prevents the tip T4 from ever being raised beyond the level at which the upper end of this tip is substantially flush with the discharge face of the tip Ti and hence substantially flush with the top face of the work-piece. The forward end of the tip arm 22 which was held in its raised neutral position by the member 58 on the tip arm 2!, descends by its own weight, when the forward end of the tip arm 26 is lowered, until the stop 55 abuts against the lower transverse member 39 connected to the tip arm 23. The stop 55 prevents the tip T2 from ever being lowered beyond the level at which its lower end is substantially flush with the discharge face-of the lower horizontal tip T3 and hence substantially flush with the bottom face of the workpiece. The torch tips will now be in the position shown in Fig. 4 with the full eflectivelength of each tip being utilized to scarf the corresponding face of the work-piece. In other words, the tips do not overlap but the entire width of each tip is active and extends from one edge of the corresponding surface of the work-piece to the other. Larger workpieces than that represented in Fig. 4 can be scarfed by increasing the effectlve widths of the tips and making appropriate changes in the length of the

stop arms

54 and 56. If the work-piece to'be scarfed has the same width as the work-piece shown in Fig. 4 but has a smaller vertical dimension, the torch tips will be moved to the position shown in Fig. 5. The inward horizontal movement of the two pairs of tips will take place as described in connection with Fig. 4, but the tip arm 2! and the upper horizontal tip T1 carried by it will descend farther as shown in Fig. 5 to bring the tip T1 into engagement with the newly located top face of the workpiece. As above stated, the stop arm 54 will always keep the upper end of the tip T4 substantially flush with the discharge face of the tip T1 60 when the tips are in operative position, and therefore the tip T4 will now be positioned as shown in Fig. 5 with its upper end substantially flush with the newly located top face of the work-piece on which the tip T1 rests. The lower end of the :5 tip T4 will therefore vertically overlap the lower horizontal tip T3 and the upper end of the tip T2 will vertically overlap the upper horizontal tip T1 as shown in Fig. 5, this being permitted because the tips T1 and T2 have independent relative ver- 70 tical movement and the tips Ta and T4 likewise have independent relative vertical movement.

The particular machine illustrated in the drawings is not adapted to scarf work-pieces whose vertical dimension is any less in its relation to 75 the width of the tips than the vertical dimension 7 of the work-piece represented in Fig. 5, because the stop 51 prevents further vertical approach of the two horizontal tips Ti and Ta. The stop 51 could be designqt to allow closer approach of the horizontal tips T1 and T3 and thus permit scarflng of still thinner work-pieces, but the principal function of the stop 51 is to prevent the tips from coming together after the work-piece has passed beyond them, and it must therefore hold the tips T1 and T3 at some minimum vertical spacing when there is no work-piece between them, and in Fig. the vertical dimension of the work-piece is assumed to correspond to this desired minimum spacing between the horizontal torch tips. The distance that the vertical tips T2 and T4 can approach each other in a horizontal direction is determined by the length of the stroke of the pistons of

fluid cylinders

52 and 53, these tips being shown at the inner limit of their horizontal movement in Fig. 6.

In Fig. 6 the work-piece W is represented as having a smaller horizontal dimension than the work-piece in Fig. 5 but the same vertical dimension. By comparing Figs. 5 and 6 it will be seen that the tips are positioned against the four faces of the work-piece in the same manner as described in connection with Fig. 5 except that the

tip arms

21 and 22 have been given at additional inward horizontal movement to bring the vertical tips T2 and T4 closer together horizontally. Since the tips T1 and T2 move horizontally in unison (as do the tips T3 and T4), the upper horizontal tip Tl will now horizontally overlap the upper end of the tip T4 and the lower horizontal tip T: will horizontally overlap the lower end of the tip T2 as shown in Fig. 6.

The billet or other work-piece to be scarfed is usually fed to and through the scarfing apparatus by power-driven conveyor rolls on which the work-piece is supported, and therefore the bottom face of the work-piece, regardless of the cross-sectional dimensions of the work-piece, will always be at substantially the same elevation. Moreover, a stationary guide is usually placed along the roller bed in advance-of the scarfing apparatus against which one side of the billet, or other work-piece, slides as it is delivered to the scarfing apparatus. Usually the guide is positioned so that the left vertical face of the workpiece engages it. In this case the left vertical face of the work-piece will always occupy the same vertical plane regardless of the cross-section-al dimensions of the work-piece. When such a guide is used and when the work-piece is fed to and through the scarfing apparatus by conveyor rolls on which the work-piece is supported, the forward end of the tip arm 23, and the lower horizontal tip T3 carried by it, will always be moved from neutral position to the same operative position. Moreover, the forward end of the tip arm 24, and the tip T4 carried by it, will never be farther to the right than shown in Figs. 4, 5 and 6 when the tip T4 is against the left vertical face of the work-piece.

As above stated, the tips are returned to neutral or inoperative position after each scarflng operation, i. e., the forward ends of the tip arms 2! and 22, and the tips T1 and T2 carried by them, are moved upward and outward, and the forward ends of

tip arms

23 and 24, and the tips Ta and T4 carried by them, are moved downward and outward from the position shown in Fig. 4. The forward end of arm 2| in moving upward will bring the member 58 into contact with the clamp 43, and therefore the arm 22 will be moved upward by the arm 2|. Since the forward ends of both arms are moved downward by their own weight, the one fluid cylinder that raises the for- 1s ward end of tip arm 2| sumces to operate both tip arms 2| and 22. Similarly, when fluid is released from the cylinders and 3| to permit the forward ends of

tip arms

23 and 24 to descend to neutral position by gravity, the member 59 on the tip arm 23 engages the clamp l1 and insures that the forward end of tip arm 24 moves downward to neutral position along with the forward end of tip arm 23.

When the scarfing tips are in overlapping rela- 15 tion as in Figs. 5 and 6, so that two or all of the tips project beyond the corresponding faces of the work-piece, the effective length of each projecting tip is prefer-ably altered so that it will conform to the width of the surface which it scarfs. This may be accomplished by plugging the outlet orifices from which the preheating flames and the scarfing oxygen jets issue in the portion of each tip that projects beyond the corresponding surface of the work-piece, or by shutting off the supply of preheating gases and scarfing oxygen to such orifices by suitable valves.

It will now be seen that the apparatus is adapted to simultaneously scarf all four faces of a billet or other work-piece regardless of the cross-sectional dimensions of the work-piece provided they fall within predetermined maximum and minimum limits. For any size work-piece within those limits each tip will move toward scarfing position until it engages the corresponding surface of the work-piece, and despite the overlapping relation that the tips must assume for work-pieces which are smaller than the maximum size work-piece that the apparatus is adapted to scarf, and despite the substantially coplanar relation they sometimes assume, there is no interference between the tips, nor can the apparatus be so operated as to cause them to interfere. Each tip always moves to and from operative position at all times without contacting with any other tip. This is due principally to the mounting of the tips which permits horizontal and vertical movements of each tip, the

preserved horizontal distance or relationship between the two tips of each pair, the fact that each tip of each pair can move vertically independently of the other tip, and to the stop arrangement described.

I claim:

1. Apparatus for scarfing billets, blooms, slabs, and the like, comprising a tip arm carrier at each side of the apparatus, a pair of tip arms mounted in each carrier and extending longitudinally of the billet or the like to be scarfed, the two tip arms in each carrier being pivotally mounted therein for independent movement in vertical planes about horizontal axes, each of said carriers being pivotally mounted for movement about a vertical axis whereby the forward ends of the two tip arms carried by it are movable in unison horizontally, a horizontally disposed scarfing tip mounted on the forward end of one tip arm of each pair and a vertically disposed scarfing tip mounted on the forward end of the other tip arm of each pair, the scarflng tips thus mounted on the tip arms constituting two pairs of rightangularly related tips one of which pairs of tips is adapted to scarf the top face and one vertical face of the work-piece and the other of which pairs of tips is adapted to scarf the bottom face and the other vertical face of the work-piece,

actuating means for moving said tip arms about their horizontal axes to adjust the scarfing tips vertically, and actuating means connected to said carriers for moving them about their vertical axes to adjust the two pairs of scarfing tips horizontally.

2. Apparatus in accordance with claim 1 having stop means operatively positioned between the tip arm that carries the horizontal tip of one pair of tips and the tip arm that carries the vertical tip of the other pair of tips to prevent relative vertical movement between the forward ends of such tip arms which would cause the vertical tip to vertically overlap the horizontal tip.

3. Apparatus for scarfing billets, blooms, slabs, and the like, comprising a tip arm carrier at each side of the apparatus, a pair of tip arms mounted in each of said carriers and extending longitudinally of the billet or the like to be scarfed, one tip arm of each pair being an inner tip arm and the other being an outer tip arm, the two tip arms of each pair being pivotally mounted in the corresponding carrier for independent movement in a vertical plane about a horizonal axis whereby the forward end of each tip arm of the pair is movable vertically, each of said carriers being movable about a vertical axis whereby the forward ends of the tip arms mounted in it are movable horizontally in unison, a transverse member connected to the forward end of the outer tip arm of each pair, one of said members extending transversely over the work-piece and the other extending transversely under the workpiece, a horizontally disposed scarfing tip carried by each of said transverse members, a vertically disposed scarfing tip carried by the forward end of the inner tip arm of each pair, the scarfing tips thus supported on the tip arms constituting two pairs of right-angularly related tips one of which pairs of tips is adapted to scarf the top face and one vertical face of the work-piece and the other of which pairs of tips is adapted to scarf the bottom face and the other vertical face of the work-piece, and means for actuating the tip arms about said axes to adjust the scarfing tips horizontally and vertically.

4. Apparatus in accordance with claim 3 having stop means positioned between the inner tip arm of each pair and the transverse member connected to the outer tip arm of the other pair and operating to prevent the vertically disposed tip of each pair of tips from vertically overlapping the horizontal tip of the other pair.

5. Apparatus for scarfing billets, blooms, slabs, and the like, comprising a pair of tip arms at each side of the apparatus extending longitudinally of the billet or the like to be scarfed, the two tip arms of each pair being mounted for pivotal movement about vertical and horizontal axes whereby the forward ends of the arms are movable horizontally and are independently movable vertically, a horizontally, disposed scarfing tip mounted on the forward end of one tip arm of one pair for scarfing the top face of the workpiece, a vertically disposed scarfing tip mounted on the forward end of the companion tip arm of the same pair for scarfing the adjacent vertical face of the work-piece, a second horizontally disposed scarfing tip mounted on the forward end of one tip arm of the second pair for scarfing the bottom face of the work-piece, a second vertically disposed scarfing tip mounted on the forward end of the companion tip-arm oi the second pair for scarfing the other vertical face of the work-piece, means for actuating the tip arms about said axes to adjust the scarfing tips horizontally and vertically, and a member on the forward end of the tip arm that carries the upper horizontal scarfing tip adapted after predetermined upward movement of such arm to engage the companion arm of the same pair whereby when the upper horizontal tip is raised to the upper limit of its travel by its tip arm the vertical tip carried by the companion tip arm is also raised to the upper limit of its travel.

6. Apparatus in accordance with claim 5 having a member on the forward end of the tip arm that carries the lower horizontal scarfing tip adapted after predetermined downward movement of such arm to engage the companion arm of the same pair whereby when the lower horizontal tip is lowered to the lower limit of its travel by its tip arm the vertical ti carried by the companion tip arm is also lowered to the lower limit of its travel.

7. Apparatus for simultaneously scarfing the four surfaces of rectangular ferrous metal bodies comprising four scarfing tips each of which is adapted to be positioned adjacent one of the work surfaces to be scarfed and being substantially as wide as the widest such surface the apparatus is designed to scarf, supporting means for supporting the tips with their inner faces in rectangular formation so that they define a central opening for the body to be scarfed and including two pairs of members, each member of each pair rigidly supporting one tip of a pair of contiguous angularly related tips, a common carrier for the two members of each pair, each carrier being movable to effect unitary movement in one direction of the two members carried by it, and the two members of each pair being pivotally mounted in their carrier for relative movement in a second direction at right angles to the first direction whereby when the members of each pair are actuated to move the two contiguous tips carried by them to operative position with respect to the corresponding work surfaces the inner face of one tip of the pair can overlap the end of the second tip in the direction in which the members are relatively movable but the inner face of the second tip cannot overlap the end of the first tip in the direction in which the members are unitarily movable, actuating means oneratively connected to said members, and stop means for preventing each tip whose one end is capable of being overlapped by the inner face of a contiguous tip from having its other end overlapped by the inner face of the tip contiguous to that end.

8. Apparatus in accordance with claim 7 in which said stop means is positioned between the two members which support the two tips whose overlapping is prevented by the stop means.

REIDAR J. NICOLAISEN.

REFERENCES crrnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number i Name Date 2,125,175 Jones July 26, 1988 2,276,329 Miller et al Mar. 1'7, 1942 2,308,684 Chelborg Jan. 19, 1943 2,323,977 Chelborg et a1 July 13, 1943 2,429,326 Miller et al. Oct. 21, 1947