Dec. 31, 1946. _R_M,SHAW,J‘R ' BENDING ‘ 2,413,524 MACHINE _ Filed Oct. 9, 1943 4 Sheets-Sheet l 117$ J_' B .0 ‘ 3.5a . > <71? f - O INVENTOR BY’ Raév/z M. Slzaw, e52, 1kg. AT’TORNEYS. Dec» ‘31, 1946- ' R. M. SHAW, JR 2,413,524 BENDING MACHINE Filed Oct. 9, 1945 4 Sheets-Sheet 2 Illlllllllllll! |1l l I l I mm 20 1'2 1} 'HGAZ _ » 4a .55 55 322,34; B i9 " 31a 51, 3” 4” 5% 32a 55a 35a l 1 l 22 ZZ 10 25 27 7515 19 221 26a BY ATTORNEYS. Dec. 31, 1946. R. M. SHAW, JR 2,413,524 BENDING MACHINE Filed 001;. 9, 1943 4 Sheets-Sheet 3 11c Zia" - I 45c — 2313524 ‘R. M. SHAW, JR ' BENDING “CHINE Filed 00%. 9, 1943 4 Sheets-Sheet ‘4 INVENTOR R . BY MJ'klIII/Jn, I? I '14.‘ 1M anomwzys. 2,413,524 Patented Dec. 31', 1946 UNITED STATES-l * PATENT GFFICE Ralph Ml N; J l, as signor to Pedrick‘ vTool & Machine Company; Philadelphia, Pa~., a corporation of ‘Pennsyl vania Application October 9, 1943,;Serial'No.—505,634 1-61Clai1'ns. (Cl. 153*46) I 1, s‘tu’d'lqrpost Maud arranged at opposite sides of the clamp arrnl 5 are arms 221v vandZlia which are right Lanldleft counterpartsof each other. The particularly in bending metallic structural bars or rods ofdi?erent cross section, pipes, tub'es,_et'c., and has reference more‘ speci?cally to bending" machines of the table type such as disclosed in U. S. Patent No. 2,266,912,‘ granted to machine" cember 23, 1941. 2 cured. in the machine. Also fulcrumed' on the This invention relates to machinesuseful more‘ arm 72'2'v has’ parallel longitudinally“-extending dove-tail slots 23 and 24 for guidance of blocks 25and'2'61 which .are adjustable along said slots by screwspindles 2.1fandlz?'re'spectively. Mounted ' The chief aim of my present invention'ifs to on'the block 25. is avertical axis grooved. roller enhance the utility of’ bending machines of the‘ kind referred to,i. e., to enable formation ofcom 10 3'! which-is adapted'to engage one side edge of plex and irregular‘ bends of different radii in one operation, as well as circularv bends of’ different constant‘ radii, without'necessitating die inter changes or‘ substitutions of otherv parts of such machines. , 15 thebar/B; while a-pairof similar groovedrollers 3'2‘and 33 freely rotatable respectively about studs 34 and v3.5 upstanding from the blookZ-ii, engage the- other sideedge of thebar BI ‘It is to-be noted that, wheniin. operativeposition, the rollers 3i and 3.2 engage the bar B at diagonally opposite Another‘ object of this‘inve‘ntion is to effect'tli‘e points,~_ while the. ro1ler._Z=f2v islaterally spaced at bending'of bars and the like mainly by compres a?xeddistance-from the roller 3|’ inra plane at sive action,,and‘ substantially without any defor right angles toithe armil. At its outerv end the mation oftthe' original'cross-secti'on. How the foregoin'glan'd‘ other objects and ad‘ 20 arm‘ .22ihas-an apertured lug projection-3:65 for passageofla latch pin 37. wherebyit may bese vantages are readily realized in practice willap cured‘ to the turn-table H for movement by the pear from the follo‘wing'det‘ailed description of the latterabout the stud‘ [4. For. the purpose offp'osi accompanying drawings; wherein Fig: 1 is‘a fragmentary view in'plan‘of one‘ . may driving; the roller 3|, during certain bend 25 ing operations, there. is provided-ayariable speed embodiment of my improved bending'fmachine'; electric motor “which. is?xedly supported-by Figs. 2, 3 and4 are fragmentary sectional views? the,_bl'oc_k~2-5 and-which has amit'er gear pinion taken as‘ indicated respectively by the angled air‘ 391 on it's shaft in meshiwithacompanion miter r0WsfII-_—II,'.III—III and‘ IV—IV in Fig. 1'. pinion 4'llilafflixedlto said roller, The arm 22a is Fig_'j5 is‘ a view‘corresponding to Fig". 1, showing an‘ alternative embodiment of my invention; and" 30 equipped with, a group of grooved instrument-ali ties which are identical‘ with those‘ above de Figs.‘6; '7V and 8 are‘ diagrammatic'views in top‘ plan_ showing how complex bends of changing; scribed‘ in' connection with the arm :22‘ but re 1-4; the bending machine'there shown‘ comprises" a circular" bed ID which is recessedfor ?ush're ience of-more-ready distinction. For operation upon‘ a bar B of ?at rectangular cross'sec‘t'ion such versely- arranged,- the corresponding. parts being curvature can be made with‘ a machine of'my in identi?e'dlby the same reference numeralswith vention. With' reference ?rst more especially 1 to" Figs‘; 35 the letter‘ a added'in each instance tenemen cepti'on of a' turnetable' in the form‘ of a disk? I I‘ 1 as the one illustrated-the rollers 3%, Sta and-‘32, bed‘. Suitably ?xed'in the bed 10 vis ‘a studor'p'o’s't' 32'a'nare con?gured as in‘sta'nced' inFig. 4', i'.f.e., provided? with‘ circumferential grooves. of rectan gular pro?leit‘o correspond accurately ‘with-the M which extends upwardly through a" central apl cross section of said bar." erture in the turn-table ll“. Fulcrumedon the stud or post I4 is an arm. l5"whichrea'chesfto the‘ marginal surface'o‘f. the‘ bed‘. In where it‘is' ?x‘ablev anfdjSl'a areiadjusted‘alonfg‘the ‘arms 22 and 22a relative to'the axis's'tudior‘p'ost war the machine having peripheral teeth l2‘ in‘m'eshing engage ment‘ with a drivin'g'pinion l3 journaled inisaid against turning ‘about’ said‘ stud by: a‘ removable latch pin“ l6‘ which is selectively 'engag'e'ablefwith socket apertures at intervals‘circumferenti'ally'of" said bed; As" shown, the arm [5‘ has a longitudi nally-extending‘doveetail slot "along which a '‘ ' n In preparation" for the- bending, the‘ rollers 3i by means of the screw spindles ‘2'1. and 121av in ac o'o‘rfdali‘ce"with"a the radius of the curvature ‘de sired,‘ whereupon-the’clamp'block. It is shiftediin wardlyalongit's} ‘arm, labyimeans of. the screw spindle‘ ,l 9“ to bifin'g'th'e' inner? edge of' the} bar ‘13 block I8 is“ adjustable by‘means ‘of ' a screwspin'dle‘ into the" grooves'ofsaidrrollerstlf and 35d. 'The l9. Incorporated with the'lolo(_:k'l8v is a holding‘ blocks‘? 6 . and 2 6a" are rie'xtshifte'd ‘inwardly along the arms: 32' and 22a'jrespectively' by? means-of means in the'form of a quick-releasable manually the adjusting“ screwszs; 23a to‘ time: the‘ rang-G operable clamp 2?‘by? which at ?at ba‘rB of ‘rec' tangular cross section which is to bebe'nt' is'js‘e-f 55 ' 3'2; swamps", sad‘i‘ntb,en'gagement‘withthe outer 2,413,524 4 edge of the bar B. With the parts thus set, the roller arm 22a free, the clamp arm I5 secured against rotation by the latch pin is and the roller bends. Accordingly, under these circumstances the bending is accomplished with little or no change in the cross section of the bar from its original form and dimensions. The alternative embodiment of my improved bending machine illustrated in Fig. 5 is generally arm 22 locked to the turn-table H by the latch pin 31, said table is rotated in the direction of the curved arrow in Fig. 1. As the arm 22 moves with the turn-table I l for example to the position in which it is shown in dot-and-dash lines, the end portion of the bar B below the clamp arm It as viewed in Fig. 1 is bent at X by the cooper ative action of the grooved rollers 31 and 32, the roller 33 serving to keep said bar con?ned to its original plane. For a short bend, the roller 3! may be allowed to roll freely through traction with the inner edge of the bar B. However, for larger bends up to a semi-circle, the roller 3| is positively driven in the direction'cf the arrow thereon by the motor 38 at a speed somewhat similar to that of Figs. 1-4, having two arms 22c and 22d respectively with grooved rollers 3lc, 32c, 10 faster than it would ordinarily rotate by traction with the bar B so as to effect a smoothing of the metal of said bar and thereby prevent ?attening 33c and 3Id, 32d, 33d, but being devoid of the clamp arm t5. Another di?‘erence to be noted is that the end lugs 36c and 36d of the arms are each provided with two apertures so that they may be locked either to the machine bed l?c or to the turn-table He by means of the latch pins 31c, 37d for the reception of which said bed and said table are respectively provided at suitably spaced circumferential intervals with socket holes 43 and 415. It will be further noted that here, the adjusting screws 21c, 21d and 28c, 28d have secured to them spur gear pinions 45c, 46c and ‘45d, 46d respectively with which idler pinions of the bend as the roller arm 22 continues its 41c and 41d slidable on studs 43c and 48d at the movement in the direction of the curved arrow outer ends of the roller arms 22c and 22d are in Fig. 1 beyond the dash-and-dotted line po meshed at certain times for a purpose presently sition. The other end portion of the bar B can 25 explained. All other elements in the alterna obviously be bent in a like manner until a com-' tive embodiment not speci?cally referred to but plete circle is formed. In preparation for the lat having their counterparts in the ?rst embodi ter bending step,'the latch pin 31 is withdrawn ment are, in order to preclude the necessity for to free the arm 22 and used to lock the arm 22a repetitive description, identi?ed by the saine'nll to the turn-table II which is thereupon rotated merals but di?erentiated by use with them of the in the direction opposite to that indicated by the letters 0 and d. curved arrow in Fig. 1. \ - The radius of the bend in all cases is deter mined by the distance of the rollers 3i and am from the axis of the machine and not on the , distance of the rollers 32 and 33 from the rollers 32a and 33a, and is independent of the dimen sions of any of said rollers. The spacing of the rollers 32, 33 and 32a, 33a is for the purpose The procedure followed in making bends of changing curvature in one operation in the alter native machine of Fig. 5 is as follows: In prep aration, the arm 22d is secured against rotation to the machine bed I?c by the latch pin 3112, with the arm 22c positioned alongside it and secured to the table He ‘by the latch pin 370. The rollers 31c and 3ld are next adjusted to the of changing the leverage, thereby to minimize 40 desired positions along the arms 22c and 22d; ?attening and wrinkling of the work or bar B as it is being bent, the rollers 33 and 33a serving to convert the single ?xed loading of each of the rollers 32 and 33a into uniform distributed load. The machine thus di?ers from the usual forms of roller benders since the arrangement of the roller assemblies is non-pyramidal. The use of two arms 22, 22a as herein shown in especially advantageous in that it allows bends to be made in different planes. By suitably shaping the jaws . of the holder clamp 26 and the peripheries of the grooved rollers 3l-33 and 3la—33a, the machine can of course be adapted to bending bars of cross sectional shapes other than the one herein shown by way of example. By reference once more to Fig. 1, it will be noted that the elements 3| and 31a function as progres the bar B engaged with said rollers; the rollers 32c, 33c and 32d, 3311 are then moved inward of said arms to engage the outer edge of said bar, and the spur pinion ll‘lc shifted into mesh with pinions 45c and 410 on the spindles 27c, 280 of the arm 220. All being now in readiness with the bar B held by the rollers of arm 2211, the table I I0 is rotated in the direction or the curved arrow in Fig. v5 through a distance say of ninety degrees, whereby the arm 220 is moved to the po sition in which it is shown in Fig. 6 to form the bend X’ in the bar B, after which said arm is latched to the bed lllc. With this accomplished, the arm 22d is pinned to the bed l?c'as likewise shown in Fig. 6 and moved to the position in which it is shown in dot-and-dash lines in the last mentioned ?gure by further rotation of the sively moving die points with the elements 26, 33 bed in the same direction as before, and ?nally and 26a, 33a constituting correspondingly moving re-latched to the bed l 00 to hold the bar B at the points of application of the forces by which the 60 terminus of the bend X’ just completed. The bar B is pressed toward the elements :3! and SI a, arm 220 is thereupon again latched to the table and moreover that the bending force or torque He and the latter further turned still in the of the machine transmitted to the elements 26, same direction to move the arm 22c say to the 33 and 26a 33a operates against a leverage arm position in which it is shown in Fig. '7 and then equal to the distance between the axes of the 65 latched tothe bed I00 and the arm 22d latched elements 26, 26a‘and the elements 3|, 3111' re to the table I la. The table He is then turned spectively. The bending is therefore accom still further in the same direction to bring the. plished by compression rather than by tension, arm 22d alongside the arm 22c and thereafter with the neutral axis of the bar B lying outside latched to the bed Hlc to hold the bar B at the of the center of gravity. In other words as the terminus of the now completed second portion bending is progressively effected by coaction be tween the moving groups of elements 26, 3|, 33 and 26a, 3m, 33a, the bulk of the bar B is sub jected to compression without any substantial at X2 of the bend.' Thereupon the arm 220 is re latched to the turn-table He, and the latter turned still further in the same direction to.v bring said arm to the position say in which it is tendant tensioning of the outside portions of the 75 shown in Fig. 8, the rollers 3| c, 320 and 33c'being' anawca. . 5 incidentally moved inward of the arm'ZZc. pro gressively by: turning‘; of one of the, spindles‘. 21c and 280? (the other spindle- being obliged to fol-1 low' suit‘ by reason of being connected ‘by the gears-45c; ‘46c and 410), with the result that a sharper curve is formed in the bar vB as shown atTX3~1in Fig. 8. ' These settings and operations are repeated asoften as necessary depending upon lyiturn'tby traction with’ said bar duringv the bending; > - 7. In: aamachine 'for'bending bars andvthe like, a. bed; az?xed: studzupstanding fromsaidi bed; a peripherally-toothed turn-table with means whereby it.-,is,=~rotatable about said: stud; anarm tul'crumed'. on ‘the; studand carrying'more than tWOxliOllGl‘S setto. engage the outer and the inner sidesoit'heban at diagonally related points; an thefshaping desired} in the barv B; and it is to be understood; that,¢.by”like manipulations and selec 10 otherearm" with means thereon: for holdingthe. bar-during the bending operation; means where tivev use of the two. arms22c, 22d, the other end by the ?rst mentionedarm; can. be releasably se vportion of the bar may be similarly ,or di?er cured to the turn-table for'rotation thereby; and entlyl‘ bent ‘through curvatures of changing radii. means whereby the second mentioned arm can be To facilitate complex bending operatings of the kind just described, I provide templates such as 15 releasably connected in different positions around the bed beyond the periphery of the turn-table. the one shown at 50 in Figs. 6-8 to de?ne the 8. A bending machine according to claim 7, lines along which the bends are to be made. The further including means whereby the several roll template 50 may be in the form of a suitably pro?led plate capable of being removably secured against rotation in the machine to the top of ers and the holding means can be adjusted along 20 their respective carrying arms. two rollers supported by the arm to one side of 9. In a machine for bending bars and the like, a bed; a ?xed stud upstanding from said bed; a turn-table rotatable about said stud; an arm ful crumed on'the stud and having means thereon for holding the bar during the bending; a pair of arms independently fulcrumed for movement about the stud, and each carrying a pair of rollers set to engage the bars at diagonally opposite points, the rollers of one of the latter arms being along said arm to engage opposite sides of the bar at diagonally related points, as considered with respect to the fulcrum, with one of said rollers serving as a backing means beyond the others and also to con?ne the bar to its original plane; quick-release holder means for ?xedly supporting the bar during the bending operation; other arm of the pair; means whereby the holder arm can be releasably secured in different posi tions around the bed beyond the periphery of the turn-table; and means whereby each arm carry ing a pair of rollers can be releasably secured se lectively to the turn-table for individual rotation thereby relative to the holder arm. the stud I40 above the roller arms 22c and 22d. It is of course within the province of my inven tion to substitute power means for actuating the spindles of the arms 22c and 2211 in lieu of the hand wheels herein shown by way of example. Having thus described my invention, I claim: 1. In a machine for bending bar and the like, an arm movable about a ?xed fulcrum; more than said fulcrum and relatively adjustable directly 30 reversely arranged with respect to those of the 10. A bending machine according to claim 9, and means operatively-coordinated with one of further including means whereby the rollers, and the rollers aforesaid for moving the arm about the bar holder means can be individually adjust 40 its fulcrum relative to said holder means. ed along their respective supporting arms, 2. A bending machine according to claim 1, 11. In a machine for bending bars and the like, further including means whereby the spaced roll a bed; a stud upstanding from the bed; a cir ers can be simultaneously adjusted along the sup cumferentially - toothed turn-table with gear porting arm; and means whereby the bar holder means whereby it is rotatable about said stud; a means can be correspondingly adjusted radially 45 pair of arms fulcrumed for independent move of the fulcrum of said arm. ment about the stud, each said arm carrying 3. A bending machine according to claim 1, bending instrumentalities for engaging the bar wherein the roller supporting arm rotatively in from opposite sides at diagonally opposite points; cludes a pair of longitudinally-extending adjust 50 and means whereby said arms can be selectively ing screw spindles; wherein followers on the said coupled either to the bed or with the turn-table screw spindles respectively carry an individual so that one may be employed as a ?xed holder and plural rollers; and further including means for the bar while the other is moved to effect the whereby the bar holder can be adjusted radially bending. of the fulcrum of the arm to correspond with 55 12. In a machine for bending bars and the like, adjustments of the spaced rollers. a bed; a stud upstanding from the bed; a turn 4. A bending machine according to claim 1, table rotatable about said stud; an arm fulcrumed further including a backing means for contacting on the stud, said arm carrying a pair of rollers one side of the bar at a point beyond one of the set to engage the outer and inner sides of the bar spaced rollers transversely of the supporting arm; 60 at diagonally opposite points, a backing means means whereby a pair of the rollers together With effective to contact the outer side of the bar at a the associated backing means, can be independ point beyond the outer of the pair of rollers and ently or simultaneously adjusted along the sup transversely of the arm; a second arm similarly porting arm; and means whereby the holder fulcrumed on the stud and having rollers and a means can be correspondingly adjusted radially 65 backing means like that of the ?rst arm but re of the fulcrum of the supporting arm. versely arranged thereon; and means whereby 5. A bending machine according to claim 1, said arms can be selectively coupled either with the bed or the turn-table so that one may be em wherein a variable speed motor is provided to ployed as a holder for the bar while the other is drive one of the spaced rollers in the direction it would naturally turn by traction with the bar 70 moved to effect the bending. 13. A bending machine according to claim 12, during the bending operation. further including means whereby the roller and 6. A bending machine according to claim 1, the backing means assemblies can be adjusted wherein a variable speed motor is provided to along their respective carrying arms to vary the drive the spaced roller which engages the inner side of the bar in the direction it would natural 75 curvature of the bending. 2,413,524 14. A- bend'i'ng machine according to claim 12, further including separate variable speed power means for rotating the inner rollers of the re spective arms when they are individuallyv em ployed to e?ect the bending operation. 15. A bending machine according to claim 12, further including a template peripherally con?g ured in accordance with the shaping desired in the bar, said template being detaohably secur 8 a ?xed fulcrum, a lever arni movable about the‘ fulcrum, said arm carryingmore than-two cir cumferentially-grooved rotatable elements in cluding one element for engaging the inner side of the bar at a single point, and the other ele ments for engaging the outer side of the bar at a point beyond the region of contact of the bar by the ?rst mentioned element; means for holding the bar against displacement in the machine dur_ able to the fulcrum stud above the two arms for 10 ing the bending; means for adjusting the respec_ service as'a guide'in adjusting the respective roll er assemblies during the bending. 16. In a machine for bending bars and the like, tive bar engaging elements along the lever arm; and means for moving the arm. RALPH M. SHAW, JR.