US1804468A - Angle bar bending machine - Google Patents

Description

May 12, 1931. J, ENSEN 1,804,468

ANGLE BAR BENDING MACHI NE Filed 25, 1927 7 Sheets-Sheet 1 May 12, 1931. JENSEN 1,804,468

ANGLE BAR SENDING MACHINE Filed Aug. 25, 1927 7 Sheets-Sheet 2 Ede/2&4 wfih J. JENSEN ANGLE BAR BENDING MACHINE Filed Aug. 25, 1927 May 12, 1931.

7 Sheets-Sheet 3 May 12, 1931. i J. JENSEN ANGLE BAR BENDING MACHINE Filed Aug. 25, 1927' 7 Sheets-Sheet 4 May 12, 1931. I J, JENSEN 1,804,468

ANGLE BAR BENDING MACHINE Filed 25. 1927 7 Sheets-Sheet 6 y 931. J. JENSEN 1,804,468

ANGLE BAR BENDING MACHINE Filed 5 1927 7Sheets-Sheet 7 '75 I ,m \i WWW 1|! Patented May 12, 1931 UNITED STATES PATET a -IC JOHN JENSEN, OF ROCKFORD, ILLINOZS, ASSIGNGR T0 WI-I ITNEY METAL TOOL COMPANY OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS ANGLE BAR- BENDZN'G MACHINE Application filed August 25, 1327. Serial No, 215,331.

The invention relates to a rolling machine for bending angle iron into curved shapes. The difficulties attending the bending of angle iron bars of straight stock into desired curved shapes, the bending being done in the plane of one leg, arise from the consequent compression or extension of the material in that leg accordingly as the latter extends inwardly or outwardly of the finished curved shape. In either case the bar tends to twist, and when bending with the leg inward, the latter tends to assume a corrugated contour.

It is the principal object of this invention to provide alrolling machine in which angle bars may be bent to curved shapes with their legs retained in true original angular relation, and without distortion of the contour ofthe legs.

Anotherobject is to provide an angle bar bending roll machine in which the operative elements are adjustable to bars of varied dimensions. I

Another object is to provide an improved arrangement of bending rolls which may be adj ustably positioned in inter-relation to effect the bending of an angle bar on any desired radius.

Another object is to provide adjustable guiding and supporting means for the angle bar being operated upon which effectively prevent distortion of the bar.

A further object-is to provide an arrangement of rolls and guides whereby the flow of 'material caused in bending an angle bar is confined to a Z0116 wherein lateral displacement of the material is effectively prevented.

Other objects and advantages will be apparent in the following description of a preferred embodiment of the invention which has been selected for illustration in the accompanying drawings. It will be understood however, that many changes in form, construction and arrangement, may be made by those skilled in the art, without departing from the scope and spirit of the invention, as expressed in the appended claims.

Referring to the drawings, Fig. 1 is a front elevationof the complete machine.

Fig. 2 is a rear elevation of the upper portion of the machine. 7

Fig. 3 is a plan view of the machine. I Fig. 4b is a side elevation of the upper portion of the machine. N

Fig. 5 is a sectional'elevation of the upper portion of the machine viewed on the plan of the line 5,5 in Fig.2.

Fig. 6 is a sectional elevationviewed on the plane of the line 6- 6 in Fig. 3.

Fig. 7 is a sectional elevation the plane of the line 77 in Fig. 8.

Fig. 8 is a sectional elevation taken on the plane of the line 8-8 in Fig. 7. i

In the drawings, the numerals 1 and 2 indicate a pair of standards upon which is supported a main body structure 3. A motor 4, suitably mounted upon brackets formed on the standards 1 and 2, supplies power through taken on a chain belt 5 and sprocket 6 to a shaft 7 having suitable bearings in the body structure 8. The shaft '7 carries av worm 8 having engagement with a worm gear 9 keyed upon a roll shaft 10 having suitable bearings fixed in the frame structure 3.

Above and parallel to the shaft 10 is an upper roll shaft 11 having adjustable bearings (more fully described hereinafter) mounted in amovable frame 12 having lateral pivotal support, as indicated at 13, upon a suitable pair ofbrackets 1& formed on the main structure 3. Provision for locking the upwardlyswingable frame 12 into rigid relation to the main structure 3, is made at the free end of the frame, by means of a lug 15 formed on the member 12 and having a bearing plate 16 on its upper face, which latteris selectively engaged by a hardened sleeve 17 carried on a cross pin 18 rigidly mounted in a swinging yoke 19 pivoted on pin 20 mounted in a pair of brackets formed on the frame 3. g

The yoke lever 19 is preferably provided with a socket extension2l adapted to receive a hand bar 22 with which the yoke lever may be operated to lock or releasethe frame 12. The latter also may be provided with a socket extension 23 adapted to receive a lifting bar I support the frame 12 in raisedposition. For convenience of manufacture, the frame 12 may be of sectional construction comprising the. two end blocks indicated at 12 and a bridge member l2 rigidly connecting the end portions.

The upper roll shaft 11 is driven at similar speed from the lower shaft 10 by a pair of inter neshing spur gears 26 and 27 respectively keyedupon the shafts 10 and 11. The shaft 10 is also provided with a driving sprocket 28 keyed thereon, and connected through a chain belt 29 with a driven sprocket- 3O keyed on a third roll shaft 31 positioned rearwardly of the other two rol shafts and supported in adjustable bearings more fully described hereinafter.

I Each of the roll shafts 10, 11 and 31 carry cylindrical rolls which are adapted to effect in cooperation the bending of angle bars. The rolls are of similar construction and are generally indicated in the drawings at 32, 33 and 34 respectively. Referring particularly to Fig; 6, and with reference numerals common to all, each roll comprises a sectional porti'on 3 5 rigidly keyed upon its respective shaft and operatively abutting at one side the lateral face ofthe adjacent shaft bearing, the

latterbeing constructed to support a considerable end thrust. A complementary section nportion 36 ofe'ach roll is also keyedto its respective shaft, but movable longitudinally oft-he shaft for adjustmentiof position relativeto the'rigid section 35.

"Positional adjustment of the section 36 is accomplished by means of collar 37 screwthrea'd'e'd upon a sleeve 38 rigidly secured upon the respective shaft and further supportedngainst endward movement by abutment,'throu gh the intervening shaft-driving gear members, with the lateralface of-the other of'the respective bearings, the latter being positively supported against end thrust. Therotatab'le threaded collar 37 operatively abuts the end face of the roll section 36, and is secured in such operative abutment by means of an annulus 39, secured to the roll as by"bolts 40 and having an inward radial flange overlying an outward radial flange formed on the coll-ar37. Sockets 4-1 may be provided -in the collar 37 to enable rotation of thec'ollar'by'a spanner wrench. Theadjustable arrangement of the roll sections'permits' spacing the sections to permit entry of one leg of an angle bar, as illustrated at'42 in Fig. 6,101 a varied ran e of. dimensio'ns',"with the adjacent faces of the roll sectijons bearing thereupon to prevent lateral distortion fof the leg under the strain of compression or extension during the bending operation, While theother leg ofthe bar is firmbetween. the rotating upper and lowerj roll sections and the bar thereby propelled' through the machine.

Thecylindrioal contour of the upper and lower roll sections is preferably smooth, while the contour of the rear roll sections is transversely corrugated. An angle bar, advancing across a horizontal plane table (hereinafter described in detail) and passing between the upper and lower rolls, endwardly engages the rotating corrugated rear roll.

The upper surface of the latter roll being positioned above the plane of movement of the advancing bar, the end of the bar is carried upward and passes over the surface of the rear roll, the continued advance of the bar thus effecting an upward curvature therein.

In Fig. 6 a bar 42 is represented in position for bending with one leg extending in a plane outwardly of the other curved leg, the spaces between the sections of the lower and rear rolls being alined to receive the outward extending leg. In Figs. 7' and 8 a bar is illustrated at 43 in position between the upper and lower rolls for bonding with one leg in a plane ext-ending inwardly of the arc of curvature of the other leg, the plane leg passing through the space between the sections of the upper roll; The spaces between sections of the upper and lower rolls are offset to afford an unbroken gripping contour in the roll section opposite the respective spaces.

The space between the upper and lower rolls may be varied by adjustment of the vertical position of the upper roll, to accommodate various dimensions of bars and to adjust pressure thereupon for effective propulsion of the bars. Referring to Figs. 5 and 6, the upper roll shaft 11 is similarly supported at each end with a bearing sleeve l i having a thrust flange abutting the roll section 35, and mounted in a block 45. The latter is resiliently supported from below by a compression spring 46 mounted in a suitable socket formed in the upper wall of the structure A laterally under-cut longitudinal slot 45* is formed in the upper portion of each block 45, within which is freely positioned the flanged head 47 of bearing position adjusting screw l8 having threaded engagement with and extending through't-he bridge portion 12 of the frame 12. A hand crank 49 is preferably fixed on the upper end of each of the adjusting screws.

The bearing blocks 45 are vertically slidable in guiding recesses 50 formed in the end portions of the frame 12. The outer end faces of the bearing blocks l5 abut the end walls of the recesses 50, and thereby sustain the end thrust of the roll sections 35 and 36. The outer end faces of the bearing blocks are also curved vertically to permit adjustment of the shaft 11 out of parallel relation to the shaft 10 and at the same time maintain approximately, centered contact between the bearing blocks and the end walls of the recesses 50. Such adjustment may be necessitated by the tapering cross section of the 53'rigidly mounted on the respective bearing 1 blocks 45 and adapted to actuate the pointer arm.

"It will here be observed that the release and swinging upward of the frame 12 carries with it the upper roll assembly and gives free access between it and the lower roll. The advantage of this arrangement is obvious in adjusting the roll sections or making repairs thereto, and permits a very compact arrangement of the associated parts 111 operative position.

-The front portion of the body structure 3 is formed, as indicated at 54 in Fig. 7, to receive a pair of adjustably spaced plates 55 and 56 which form a bar-supporting table, l'lush with the top of the lower roll 32. 'The plates 55 and 56 are provided with downwardly extending flanges at their adjacent edges, forming a guide slot 57 alined with the annular slot between the sections of the roll 32 and adapted to receive one leg of an angle bar being advancedto the bending rolls. The plate 55 is rigidly secured to the supporting structure 54, and may be provided with an auxiliary guide flange 58 rigidly secured thereto and extending upwardly in alinement with the slot 57. V The'plate 56 is mounted for lateral adjustment of position in relation to the plate 55 to vary the width of the slot 57 in accordance to the various thicknesses of angle bars. The plate 56 is rigidly secured to a block 59 laterally slidable on the structure 54: and on a pair of guide pins 60, the latter being rigidly secured in the structure 54 and extending into suitable bores in the block 59. A cross slot 61 is formed in the block 59, into which oping a retaining collar 64 secured thereto. An

integral stem 65 extends upwardly through the slot 61 and an opening in the plate 56, and carries a hand crank 66 keyed to the stem and adapted to rotate the spindle. .By rotating the latter, the eccentric annulus 62 causcs the movement of the block 59 on the guide pins 60, and effects the adjustment of the width of the slot 57 to the thickness of the engaged angle bar. The adjustment may be locked by means of a hand nut 67 threaded on the upper end of the stem 65, and adapted to bind the parts associated with the spindle in friction tight contact.

The adjustable slot 57 functions with the plates 55 and 56during the bending of an angle bar with the plane leg extending outward of the arc of curvature, and serves to prevent twisting or'other distortion in the bar entering the rolls, and the plates serve as rigid guiding supports for the bar against the bending strains set up by the rolls. The position of the bar during the bending operation with the plane leg outward is represented in Figs. v1, 5 and 6.

' Other front guiding and supporting devices are provided in association with the plate 55, which function when an angle bar is being bent with the plane leginward of the arc of curvature, as shown in Figs. 7 and 8. The pivoted end block 12 of the upper roll frame is provided with a pair of frontwardly extending spaced lugs 68, between which is supported a vertically adjustable bracket 69. The bracket 69 bears rearwardly upon suitable slideways providedon the adjacent face of the block 12, as indicated at 7 O in Fig. 3, and is further supported for vertical movement by a guide bar 71-rigidly secured in the lugs 68 and passing through the bracket 69 in sliding fit therewith.

The bracket 69 may be adjusted in vertical position by means of a vertical spindle 72 having screw threaded engagement with the bracket and rotatably supported in the upper lug 68, the spindle being provided with a fixed collar bearing upon the lower face of the upper lug, and having a hand wheel 73 rigidly secured to its upper end and operalaively bearing upon the upper face of the The front portion of the bracket 69 is horizontally bifurcated to receive a swinging sub-bracket 74pivoted on a vertical pin 75 secured in the bracket 69. The free end of the sub-bracket 7 at carries a front guide roll 76, rotatably supported on a vertically disposed pin 77 rigidly secured to the sub-bracket. The latter is also provided with a handle 78 by which the roller 7 6 may be swung into operative position in lateral alinement with the space between the sections of the roll 33.

As illustrated in Figs. 7 and 8, in which an angle bar is shown in the operation of bending with the plane leg inward and extending between the sections of the upper roll 33, the front guide roll 76 isswung into lateral contact with the upright angle bar leg (after the bar has been started between theupper and lower bending rolls) and then is adjusted downward by means of the hand wheel 7 3, to position the end of the guide roll in bearing contact with the horizontal leg of the bar. Thus adjusted, the front guide roll 76 serves to prevent distortion of the advancing bar under the bending strains, by holding the bar in flatwise position upon the table plate 55 and preventing lateral inward twist of the upright leg of the bar.

Further means for preventing distort-ion of the angle bar-forward of the rolls 32 and 33,-compr-ises a shoe 79 (see Figs. 3 and 8) positioned between the guide roll 7 6 and bending roll 33. The shoe 79 is'rigidlysecured to the bracket69 and is alined laterally and endwardly with the guide roll 7 6, therebyiefi ecting contact with the angle bar similarlyto the guide roll. The lower end of the shoe 7 9 is advanced between the rolls 32 and 33 to engage the bar near to the line of engagement of the horizontal leg of the bar by those rolls. The shoe '79 efiec-tively aids in preventing any buckling or twisting of the bar under the strain of bending, which it has been found otherwise occurs immediately in advance of the propelling rolls.

The radius of curvature of an angle bar effected by the bending operation is determined by the elevation of the rear roll 34 in relation to the other two rolls, and to that end the rear roll is adj ustably mounted. The roll shaft 31 is endwardly supported in apair of similar adjustable bearing structures, each comprising abearing block 80 (see Figs. 2 and 5) inwhich the shaft is'journaled. The bearing blocks 80 are slidably positioned with front-and rear bearing contact in slideways 81, between which the roll 3 is positioned and which are formed in a pair of suitable structures 82 preferably integral with the rear wall sections of themain structure 3. 1

Each of the bearing blocks 80 is adj ustably supported in a sliding bracket 83 operatively positioned in its respective slideway 81 and having a recess to receive the block 80 so that thestructure of the bracket 83 extends beiow, endward and above the bearing block. Retaining plates 84 preferably are provided on the front and rear faces. of the bracket 83, and which serve also as slide bearing plates. Each ofthe blocks 80 endwardly abuts the adjacent wall of the recessed bracket 83, the

contour of the abutting block end being ver tically curved to permit unequal elevation of the two ends of the shaft 31 and at the same time maintain approximately centered coutact between the end of the block and the bracket wall. Similarly to the bearing supports for the upper roll 33 previously described, the bearing blocks-80 sustain the end thrust of the adjustably spaced roll sections 35 and 36, transmitted through the bracket 83 to the rigid structure 82.

In accommodating the rolls to angle bars of tapered cross section, it is necessary to adjust the two ends of shaft 31 at variant elevations, and to that end the blocks 80 are constructed for some degree of oscillation in the plane of the axis of the slideway. This is accomplished by providing transverse bearing ribs 85 on the upper and lower surfaces ofthe block 80 which maintain contact with the adjacent recess walls of the bracket 83, the uppei and lower surfaces of the block being otherwise spaced from the bracket.

' The'angle of inclination of the shaft 31 may be indicated upon a, pairof graduated plates 86 mounted on the slideway structure 82, andover which pass apair of pointer arms 87. rigidly secured to the respective brackets83....

The elevation of the supporting brackets ,83is adjustably determined in eachcase'by means ofa spindle 88 (Fig. 5) having-screw threaded engagement with. the bracket and supported in a thrust-sustaining housing 89 rigidly mounted at the lower end of the slide structure .82.v The spindle 88 is constructed with a fixed collar 90 associatedwith a conventional thrust bearing 91 provided in the housing 89. The spindle is rotated-by means of a worm gear 92rigidly'mounted. on the lower end thereof and actuated by aworm pinion 93 .(Fig. 4) :mountedon a shaft 94 extending outward of the housing 89 and carrying a hand wheel 95. By manipulation of the hand wheels 95, the back roll 34: may be readily adjusted to the desired elevation and with the desired axial inclination.

Further means for preventing distortion of the angle bar in the bending operation are provided in association with the rear or back roll 34. In bending a bar with the plane leg extending outward of the arc of curvature, that leg passes, through the slot formed between the sections of the back roll, and without further guidance would twist to the right, as viewed in Fig. 2, after leaviugvthe back roll. To prevent such distortion, a. guide roll 96 is provided, which is permanently alined laterally with the slot between the sections of the roll 34, but may be universally adjusted in a plane perpendicular to the axis of the roll 34, for-advantageous positioning for different radii of curvature of angle bars.

The lateral guide roll 96 is rotatably mounted on a pin 97 supported between the arms of a yoke 98, the latter being pivoted on a horizontally adjustable sliding carriage 99. The pivotal axis of the yoke 98 is perpendicular to the axis of the guide roll 96, the lateral yoke being operatively supportedon a pivot pin 100 rigidly secured in the yoke and extending laterally through the carriage 99. The adjacent faces of the yoke and carriage are respectively provided with an annular series of ratchet teeth indicatedat 101 concentric with the pivot pin and adapted for interengagementto retain the adjusted position'of the yoke and guide roll about their pivotal axis. When adjusted, the toothed faces of the yoke and carriage are secured in inte-rengagement by a nut 102 104 (Fig. 8)-provided. on opposite sides of its horizontal lower edge, the carriage being constructed for operative bearlng thereupon and belng retained 1n 1ts suspended positlon below the bracket by means of bearing plates 105 (Fig rigidly secured to the carriage and overlying the slide bearings 104. The

position of the carriage '99 is adjusted by:

means of a spindle 106 having screw-threaded engagement with the carriage and rotatably mounted in a downward extension 107 of the bracket 99. The spindle 106 is suitably secured against longitudinal movement in the bracket extension and is rotatable by means of ahand wheel 108-rigidly mounted on its outer end. 1

The bracket 103is supported for vertical adjustment of position. upon the upper roll supporting frame 12. The adjacent endmem-1 ber of the; frame 12is provided witha pair.

of vertically disposed: spaced parallel slide bearings 109 (Figs. 3 and '8) between which the base of the bracket 103 is positioned and provided with cooperating slide bearings 110, the bracket "being laterally retained in position by means of a pair of plates 111 rigidly secured to the structureof bearings 109 and operatively overlying the bearings 110. Ver-= ticaladjustment of position of the bracket 99 is effected by a spindle 112 (Fig. having screw-threaded engagement with the bracket and rotatably mounted in a lug 113 formed onthe frame bridge member 12 The spindle is suitably secured against longitudinal movement and is provided with a hand wheel 114 rigidly mounted on its upper end by which the spindle may be manually rotated for adjustment ofthe bracket.

The horizontal. and vertical adjustmentsk provided for the carriage 99 and the bracket 103 enable the ready positional adjustment of the guide roll '96: to the variable position of the back roll 34, for most effective resistance angle bar" to the'torsional strains set up in the in the bending operation.

The considerable" operating side strain uponthe bracket 103is sustain ed at its outer end by a rigid support provided for the downward-extension 107 of the bracket. This support comprises a swinging abutment 115 (Figs. 2 and 8) pivoted at its lower end upon a pin 116 supported in a pair of.

spaced'lugs 117 laterally embracing the abutment and carried by a bracket 118 rigidly secured to the back roll slide structure 82. The abutment 115 is provided with vertically extendingslot 119 adaptedto receive in slidable bearing contact the suitably dimensioned lower end of the bracket exten? sion 107, and prevent any side movement of the latter, in whatever, position of elevation the bracket may be adjustech The abutment 115 is further supported laterally by a stand- {1111120 formed on ,thebracket 118 and. ex-

is within the slot.

when the latter. is in normal position.

tending in lateral contact with the abutment In order to swing upwardly the. upperroll supporting frame 12 which carries the bracket 103, 1t-1s necessary to disengage the abut.- ment ironi'the bracketextension 101, and for thatpurposethe abutment 115 may be swung outwardly upon its pivotal support to free the bracket extension 107 from the slot 119. The abutment is normally retained in operative position of support bya spring 121 secured upon the upper end of thestandard 120 andadapted for latch engagement with a boss.

122 formed on the adjacent portion of the abutment. For convenience of operation, the

abutment may be provided with ahandle In bending angleba'rs with the plane legextending inward of the arcof curvature,

distortion of the bar .developing after leav- ;ing theback roll-34 is prevented by means of a rear guide roll 124, mounted also'on the carriage 99 and adjustable in relation to the back roll 34'by the same means. The rear guide roll 124 is rotatably mounted on a pin 125 (Fig.5) rigidly secured in the carriage 99,,the outer end being alined with the slot between the sectionsiof'the upper roll 33.. When using the guide roll 124, the roll 96 and its supporting yoke-may be swung about its pivotal supporting pin 100, out of the path of the advancing angle bar. The rear guide roll 124 is then adjusted in position to lie snuglyin the angle between the legs of the. bar as it leaves the back roll, thereby holding the horizontal leg flat upon the bending roll and preventing any twisting thereof. For aid in a graduated indicator plate 126 may be mounted on the bracket 103, over which passes a pointer arm 127 secured upon the. carriage 99. i

In the'opeartion ofbending anangle bar as herein described, great advantage is possessed by the arrangement of rolls, supporting table and guiding devices, in thatthe bending-is accomplished atthe line of contact between the bar and the two driving rolls, and the consequent flow of metal in the leg being passed through theslot between the adjustable sections of the rolls occurs while that leg Referring to Fig. 8,

The resultant flow of metal as the u Der le 7 Pl g accurately positioning the rear guide roll 124,

of the bar is compressed upon itself, occurs immediately above that contact line and wholly within the slot in the upper. roll. .zThe

firm lateral support afforded by the abuttingroll sectionspreventsany lateral weaving of relieved between the back bending roll and the-rear guide roller 124. The strains set up in the portion of the bar approaching the driving rolls are overcome by the front guide roller 76 in holding the bar firmly to the plane of the-supporting table, and by the guide shoe 79 which supplements the lateral support of the roll sections and also prevents any buckling of the flat leg of the bar.

As shown in Fig. 5, wherein is illustrated a bar being bent with the plane leg outward, the latter is passed through the slots in'the lower driving roll and back bending roll with the same effect of firm lateral support against distortion under the stretchingforce applied to the plane leg at the line of contact between the bar and the tangential driving rolls. The tendency of the bar to twist laterally under the stretching strains is overcome-by the slot in the front table and the rear lateral guide roller 96.

In both cases, the plane table support for the advancing bar performs an important function in positively maintaining the direction of advance of the bar while sustaining the bending force, so that the arc of the curved shape is true.

It will here be apparent that the invention effectively accomplishes the bending of angle bars of variable dimensions,'in.true arcs of curvature of variable radii, without distortion of the finished shapes, and with readily adjustable operating machine parts assembled in a compact, eflicient machine unit.

I claim as my invention: 7

'1. In an angle bar bending machine, a bar supporting table, a pair of driving rolls in tangential relation to the plane of said table and to each other, a bending roll positioned oppositely of said table and traversing the plane thereof and a rear guide roll coacting with said bending roll at a point adjacent the point of contact between said bending roll and a bar to be operated upon.

2. In an angle bar bending machine, a bar supporting table having a plane surface, a pair of driving rolls in tangential relation to the plane of said'table and to each other, one 7 of said rolls having a slot for the admission of one leg 0t an angle bar passing over said table and between said rolls, and a bending roll'positioned opposite to said table adapted to receive said bar and bend it out of the plane ofsaid table and means coacting with said bending roll to control vertical and horizontal movement with respect to said bending roll of a bar being operated upon.

' 3. In an angle bar bending machine, a bar supporting table having a plane. surface and a slot therein adapted to receive one leg of an anglebar passing over said table, a pair of driving rolls in tangential relation to the plane of said table and to each other, one of i said rolls having a slot to receive a le of said bar in passing between said rolls, a ending roll positioned opposite to said table adapted to receive said bar and bend it out of the plane of said table, said bending r011 having a slot to receive a legof said bar in passing thereover and means immediately adjacent to and coacting with said driving rolls and said table to control a bar being operated upon to pre- I vent distortion thereof.

4. In an angle bar bendin machine, a plane supporting table, a pair 0 driving rolls normally in tangential relation to the plane of said table and to each other, one of said rolls being adjustable in the common plane of their axes to position said one roll in slightly angular relation to the plane of said table, and a bending roll positioned rearwa'rdly of said driving rolls 5. In an angle bar bending machine, a plane table, a pair of driving rolls in tangential relation to the plane of said table and to each other, and a bending roll positioned oppositely to said table with its axis normally parallel to the axes of said driving rolls; said bending roll being adjustably mounted for positionin in slightly angular relation to the plane 0 said table.

6. In an angle bar bending machine, a plane table, a pair of driving rolls in tangential relation to the plane of said table and to each other, and a bending roll positioned oppositely of said table having its axis in parallel relation to the axes of said driving rolls, said bending roll being adjust-ably supported for variable positioning relative to the plane of said table and a rear guide roll adjustably supported with respect to said bending roll.

7. In an angle bar bending machine, a table, a pair of cooperating driving rolls positioned at the margin of said table, a bending roll associated with said driving rolls, and a front guide roller mounted on an axis substantially perpendicular to the plane of said table adapted to engage both legs of an angle bar' passing over said table to'sai'd rolls and hold said bar upon said table'to prevent lateral and vertical distortion thereof.

8. In an angle bar bending machine, a table, a pair ofc-ooperating driving rolls positioned at the edge of said table, a bending roll associated with said driving rolls and of driving rolls positioned adjacent a marginal edge of said surface, a bending roll associated with said driving rolls, and a guide shoe positioned adjacent one of said driving rolls and having its extremity proximate to the line of contact with said driving rolls of an angle bar passing over said plane surface and between said driving rolls, said shoe being adapted to engage the leg of said bar in contact with said plane surface and hold said leg upon said surface.

10. In an angle bar bending machine, a roll shaft, bearings for the ends of said shaft, rigid endward abutments for said bearings respectively, a roll section rigidly mounted on said shaft and abutting one of said bearings, a second roll section mounted on said shaft in longitudinally adjustable spaced relation to said first roll section, a driving gear mounted on said shaft in abutment with the other of said bearings, an outwardly screwthreaded sleeve secured on said shaft in abutment with said gear, a collar having screwthreaded engagement with said sleeve and abutting said adjustable roll section, and a retaining annulus secured to said adjustable roll section and overlying a. marginal portion of said collar.

11. In an angle bar bending machine, a roll shaft, a pairof bearing blocks in which the ends of said shaft are journaled, a pair of rigid supports for said bearing blocks, each of said supports having a recess receiving one of said blocks in slidable cont-a ct laterally and endwardlyof said block and permitting vertical adjustment of position of said block. the endward face of each of said blocks being cylindrically curved on a radius substantially equal to the length of said shaft, and means for independently adjusting the vertical position of each of said bearing blocks.

12. In an angle iron bending machine, a

roll shaft, a pair of bearing blocks support ing the ends of said shaft respectively, a pair of rigid supports for said bearing blocks, each. of said supports having a recess receiving one of said blocks in slidable contact latera-11v and endwa-rdly to said block and permitting vertical adjustment of position of said block, and means for adjustably securing the vertical positions of said blocks.

13. In an angle iron bending machine, a roll shaft, a pair of bearing blocks supporting the ends of said shaft respectively, a pair of rigid supports for said bearing blocks, each of said supports having a slideway receiving one of said blocks in slidable lateral contact, a bracket slidable in each of said slideways and having a transverse recess receiving one of said blocks in endward, top and bottom support thereof, each of said blocks having a transverse rib formed on its top and bottom surfaces in contact with the adjacent walls of said bracket, and means for bending roll,

adjustably securing the positions of saidsa-id table and adapted to engage said bar and hold it in normal relation to said table, a swinging supportfor said roller adapted to move said roller intomand out of lateral engagement with said bar, and an adjustable support for said swinging support adapted to move said roller in variably distant relation'to said table;

15. In an angle bar bending machine, a stationary table adapted to support an advancing angle bar, a pair of driving rolls adapted for propelling engagement with said bar, a guide roller positioned adjacent said table and adapted to engage said bar and hold it in normal relation to said table, a guide shoe extending adjacent said driving rolls and said table for guiding contact with said bar, and adjustably mounted common supporting means for said guideroller and said guide shoe adapted to vary the position thereof in like relation to said table.

16. In an angle bar bending machine, a stationary table adapted to support an advancing angle bar, a pair of driving rolls adapted for propelling engagement with said bar,a bending roll associated with said driving rolls in oppositeposition to said table and adapted to engage said bar, a rear guide roller adapted to'engage said bar oppositely I of said bending roll and hold said bar in normal engagement with said bending roll, and adjustable means for varying the position of said rear guide roller in relation to said bend ing roll in a plane perpendicular thereto.

17. In an angle iron bending machine, a

pair of driving rolls adapted for propelling engagement with an angle bar, a bending roll for bending said bar in engagement therewith, a guideroller adapted for lateral engagement with said bar adjacent said bend ing roll to prevent lateral distortion of said bar, a rear guide roller adapted for vertical engagement with said bar adj acent said bending roll to prevent vertical distortion of said bar, and adjustable means for varying the po sition of said guide rollers in planes respectively perpendicular and parallel to said 18. In an angle iron bending machine, a pair of driving rolls adapted for propelling engagement'with an angle bar, a bending roll for bending said bar, a guide roller adapted for lateral engagement with said bar ad acent said bending roll to prevent lateral distortion of said bar, a bracket having anadj ustable mounting at one end and providing an intermediate adjustable support for said guide roller, and a swinga-blesupport adapted for SBlGCtlXG engagement with the other end of said bracket to afford rigid lateral support therefor. Y

19. In an angle bar hendingniachine, a

the reception of one leg of said angle bar.

one of said sections being adjustably mounted to vary the Width of said slot.

In testimony whereof, I have hereunto aflixed my signature.

JOHN JENSEN.

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