US1957395A - Bar bending machine - Google Patents

Description

y 1, 1934- c. KIRCHNER 7 1,957,395

BAR BENDING MACHINE Filed May 15, 1932 4 Sheets-Sheet 1 Jfo A TTORNEY.

y 1, 1934- c. KIRCHNER 1,957,395

BAR BENDING MACHINE Filed May 15, 1932 4 Sheets-Sheet 2 33 $5 Z A3 Af 4 W 7 I 11v VENTOR B Y WW 9 1 11 54 A TTORNEY May 1, 1934.

c. KIRCHNER 1,957,395

BAR BENDING MACHINE Filed May 15, 1952 4 Sheets-Sheet 3 17% A TTORNEV y 1, 1934- c. KIRCHNER 1,957,395

BAR BENDING' MACHINE Filed May 15, 1832 4 Sheets-Sheet 4 INVENTOR BY WW W MM Jfi'd A TTORNE y Patented May 1, 1934 name 1,957,355 are BENEI'NG MACHINE Carl Kirchnen'Carthage, Mo, assignor to Ileggett and Flatt Spring Bed and Manufacturing-Corn parry, Carthage, Mo.,' a. corporation of Missouri epiicatiofiiviay rs, 1932", serial No. 611,128 18' Claims. (o1. ire-4e) My invention relates to iinprovenients in' bar bending machines. It is particularly well adapted for bending angle bars. I

one of the objects of niy invented are provide a bar bending machine with novel means for engaging the' bar to hold its from buckling or other distortion di1ring'bendingoperation, when the flange is disposed at either the inner or outer side of the bar. I

My invention provides further novel means for holding the bar from longitudinal'rnovernent during the bending operation. w H

My invention provides still further a novel I bending member adapted to engage'thebar to be bent for a substantial distance lengthwise of the web and for imparting to thebar bending member a novel oscillatory'riioveinent about a form around which it bendsth'ebar. I

My invention provides novel means for int- 20 parting oscillation around the farm to the bar bending member. H A further object of my invention is to provide a novel bar bending machine, which isjsiinple, strong, durable, not likely to get out of order, which is quick in its operation. and'whichpe'r} suits of the insertion of the bar to bebentandits removal without having to demo-am any of the parts of the machine. The novel features of my int/an mate hereinafter fully described and claimed. a In the accompanying drawings illustrative of my improved machine, I i

Fig. 1 is a reduced plan view partlybrolgen away, of the machine, and its driving mechanism. Fig. 2 is an enlarged elevation" of the motor driven pulley and parts connected therewith.

Fi 3 of Fig. 1.

Fig. i is an enlarged plan View, partly broken away, of the bending machine. Fig. 5 is a section on the line 55 of Fig. 4, showing a bar to be bent with its flange at its outer side mounted in operative position on the machine. I

Fig. 6 is a View similar to Fig. 5, showing the bar to be bent with its flange a't 'its inner side.

Fig. 7 is a section on the line '7--7 of Fig; 41' Fig. 8 is a plan view of the cam actuated sliding plate shown in Fig. 7. g I

Fig. 9 is a perspective view of theT' shaped clamping member, enlarged, which clamps'and holds the inwardly extending fiangejo'fthe' bar to be bent and holds timber from longitudinal movement during the bending operation. I

Fig. 10 is a side elevation of a portion'of the is an enlarged section on the line 33 supporting table, enlarged, and parts Carried thereon. Fig. 11 is: a plan view, enlarg'ed of the table, parts carried thereby, and parts bi'okeri'awayj, showing an angle bar bent around the forth with 69 the'jfiange of the bar at the inner sidethereof;

. Fig. 12 is a section taken on the pla'ne oi the line l5 looklrigifi ai directlon'. the reve e of that indicated by the arrow iriIFig', 4,I sho mg an angle bar held clarnped'with its flange at the outer side thereof.

Fig. 13 is a section on the line 13 13.or Fi Fig. 14 is a' diagrammatic view of the flange clamping mechanism. a V Fig. 15 is an enlarged sectiontakenon the plane Of the line 15- 15 looking in the diiec'tion iridicated bythe arrow in Fig. 4. J Fig. 161s an'enlargedsectionon theline 16 '16. of Fig. 11, the parts being shown in the claiiipiiig position. I

Fig. 17 is a sectionoh the me v-iiorai 16,. Fig. 18 aka SGftiOn on the line Iii-+18 Of. Fig. 16., Fig. 19 is view, partly in .v ei'ticalsctiohla iid partly in elevation'of the clamping bar and the form, the clamping lea-rand the movable clain'pmg ring on the form; shown'in'the release p'osi 5: U 1g. 201$ a'view similar to Fig. 19, the ami barand'the clamping ring being shown in the clamping positions. 35

Fig. 21 is apersp'ective view of thebendingbar and itsop'era'ting roller, the barbeing shown'eneI g'aged with'an angle bar the flange of which is outwardly turned.

Fig". 22 is a view similar to Fig. 21, with; the at" angle bar disposed with its flange extending" in Fig. 23 is a'perspective view of a portion of an angle. bar which has been bent around the form andhas its flange atitsouter side. I v

Fig. 24 is a perspective viewo'f an anglebar' which has been bent: around the form with its flange extending inwardly. v

Fig. 25 is a perspectiveview of an angle bar which has been bent without its inwardly ektendmg flange having been held frombuckli'ngdu'rin'g the bending operation. v

Similarref'erence' characters designate siinil'ar parts in the differentviews. v I

My improved bending machine isprovided with ajsiipplort for'some of the: parts comprising a jsiib st'antial rectangular table top 1 supported byjleg'fs' 2; and'su'pporting a circular form 3' against me periphery of which is adapted to bear theweb 4" of'an angle bar having a fiange'5.

For bending the angle bar around the form 3, with the flan e either inwardly or outwardly extending, there is provided a bar bending member 6 comprising a bar rectangular in cross section and slidably mounted on the support, the table top 1, and adapted for oscillatory movement thereon circumferentially around the form 3.

The side of the bar 6 next to the form 3 is spaced therefrom so as to admit between them the web 4 of an angle bar. Said side of the bar 6 is of substantial length and has a bearing surface extending longitudinally and adapted for bearing at one time for a substantial distance lengthwise of and against the side of the web 4 which is distant from the form 3.

The under side of the bending bar 6, as shown in Figs. 5 and 21, is provided with a longitudinal groove 7 which with the table top 1 forms a channel into which the flange 5 of the angle bar to be bent is adapted to be fitted, when the angle bar is to be bent with the flange 5 at its outer side, Figs. 4, 5, 21 and 23.

To the upper side of the bending bar 6 is rigidly fastened a rack 8, the teeth of which overlie the bar 6, as shown in Figs. 4, 5, 6 and 11, and are in mesh with the teeth of a spur gear wheel 9 which is rigidly secured to the upper horizontal side of the form 3, Figs. 1, 4, 5 and 6. The rack 8 and gear wheel 9 hold the bending bar in traveling engagement with the form 3, without permitting the bending bar to move endwise with respect to the angle bar with which it may be engaged.

For fastening the form 3 to the table top 1, there is extended centrally vertically through the form 3 and the gear wheel 9 a vertical tube 10 the lower end of which bears on the table top 1, and upon the upper projecting end of which is mounted a washer 11, Fig. 5, which is mounted on a vertical rod 12 having threaded upper and lower ends, and which extends through the tube 10 and the table top 1, and has threaded engagement at its lower end with a cylinder 13 provided at its lower end with annular flange 14, and the upper end of which bears against the under side of the table top 1. On the threaded upper end of the rod 12 is mounted a nut 15 which bears against the upper side of the washer 11.

For imparting an oscillatory movement to the bending bar 6 around the form 3, there is provided a horizontal lever comprising a relatively long tube 16 having fastened to it two members 17 and 1S to which are respectively secured the ends of a horizontal plate 19 which is pivotally mounted on the tube 10 between the gear wheel 9 and the washer 11. A brace rod 20 has one end fastened to the member 17, its outer end being fastened to the tube 16.

Extending through and fastened to the plate 19 is a vertical pin 21, which below the plate has revolubly mounted on it a roller 22 which is adapted for rolling engagement with the side of the bar 6 distant from the form 3.

In the initial position, the parts are disposed as shown in solid lines in Figs. 1 and 4, in which position the angle bar to be bent can be inserted endwise between the bar 6 and the form 3 to the position of the angle bar at which it is desired to make a bend therein. After the angle bar has been clamped, as will be later explained, to hold it from longitudinal movement in the bending. op-

' eration, the lever tube 16 is swung from the initial position shown in solid lines in Figs. 1 and 4, to the position shown in dotted lines in said figures.

As the lever tube 16 is so swung, the roller 22,

carried by the plate 19 attached to the lever tube, has traveling engagement with the outer side of the bending bar 6 and imparts to the latter a traveling movement circumferentially around the form 3, the toothed engagement of the rack 8, attached to the bar 6, with the gear Wheel 9, prevents the bending bar 6 from longitudinal movement relatively to the web 4 of the angle bar which it is bending around the form 3. As the angle bar has some resiliency the lever tube 16 and the bending member 6 are swung sufliciently more than 90 degrees from the initial position, shown in solid lines in Figs. 1 and 4, to compensate for the resiliency of the angle bar, so that, when the bending operation ceases, and the lever tube 16 and bending bar 6 are retracted from the dotted position, shown in Figs. 1 and 4, to the initial position, the angle bar will spring back to the right angled position, when a bend to such an angle is to be made.

By having the bending bar 6 engage with the outer side of the web 4 of the angle bar for a substantial distance lengthwise of said web, at one time, and by engaging opposite sides of the flange 5 of the angle bar, as will be described, the angle bar will be bent, with its flange at its inner or outer sides, without buckling, crimping or other distortion thereto. By having the longitudinal bearing surface of the bending bar 6 of substantial length and bearing for a substantial distance against the web of the angle bar and intersected at right angles by the radius which intersects at right angles that portion of the web which at the time is being bent against the form 3, and by having that portion of the bar 6 which is nearest at that time to the form spaced therefrom substantially only the thickness of the web, liability of crimping the flange will be eliminated and the springing back of the bent bar will be of a minimum amount.

To hold the angle bar from longitudinal movement during the bending operation, with the flange 5 thereof at its outer side, as shown in Figs. 4 and 5, there is provided above the table top 1 to the left of the form 3, as shown in Figs. 1, 4 and 11, a clamping bar 23, which is pivoted near one end on a vertical pin 24, the lower end of which is fastened to the table top 1, Figs. 4, 7, 11 and 16. The bar 23 is vertically slidable a short distance on the pin 24 to enable the flange 5 to slip under the bar 23, the latter having a longitudinal groove 25 in its bottom to receive the flange, Figs. 4, 7, 12 and 15.

As shown in Fig. 16, the bar 23 is normally forced to its upper position by two coil springs 26 encircling respectively two vertical pins 2'? the lower ends of which are slidable on the table top 1, the springs and pins being located in recesses 28 provided therefor in the under side of the bar 23. Two collars 29 rigidly fastened to the upper ends of the pins 27 limit the upward movement of the bar 23 to the raised position shown in Figs. 15 and 19.

For pulling the bar 23 to the left, as viewed in Figs. 1 and 4, it has attached to its left side, I

as viewed in said figures, one end of a horizontal coil spring 30, the other end or" which is fastened to a horizontal plate 31 which is supported by the table top 1, Figs. 1, 4, l0 and 11.

To force the bar 23 downwardly and inwardly to clamp the flange 5 of the angle bar to the table top, to hold the bar from longitudinal movement during the bending operation, and to move the bar 23 to the right, as viewed in Figs. 1 and 4, to hold the web 4 of the angle bar against a block 32 fastened to the table top, so that the angle bar can not spring away from the form 3 while being bent, there is provided a vertical bar 33 which is vertically slidable in a hole 34 in the bar 23, and in a hole provided through the tabletop 1, Figs. 4, ll, 12, 15 and 16.

The bar 33 is substantially rectangular incross section as are the hole 34'and. the hole through the table top, the barbeing fitted: in said: holes: so. as not to turn axially, the hole 34 in: the bar 23, however, having a width sufiicient to. permit the bar 23 having its lateral movement. The

upper end of the vertically slidable bar 33. has a head provided on its under side with an oblique surface. 35, Figs. 12, 15 and 16, adapted-to engage the upper side of the bar 23 and pull the latter downwardly to the-clamping position, when the bar 33: is drawn downwardly, Fig. 12.

The lower end of the-bar 33 is threaded. and is encircles the bar 33 and has its lower endbearing on the bracke 36 and its. upper end. bearing against the under side of a nut 33on the threaded part of the bar 33, Figs. 10, 12 and15.

To draw the bar 33downwardly so-as to move the clamping. bar 23.downwardly to the clamping positiononthe flange 5 and inwardly against. the web 5 of the angle bar, there is mountedon the bar. 33, and held from turning thereon, andirestingonthe nut 33, a cam plate 39, the upper'sideof which operatively engagesthe under side of acam'plate os'cillative onthe bar 33and adapted for oseillation by a horizontal lever 41, Figs. 1, 4, 1G, 11, and14to 17', said lever being oscillative manualiy from the nonclamping. position, shown in solidlines in Fig. 1 and Fig. 14 to the clamping position shown inFig. 4' and'in dotted.

lines in Fig. l.

When-a bar isto be bent with its flange 5 at the outside, the lever 41 is disposed inthe nonclarnp ing position shown in Figs. 141and.15, in which. position the bar 33 will be raised, thus releasing; thebar 23 which will be drawn by the spring? 30 tothe nonclamping position,- Fig. 15. Thelever tubelfiWillat this time be disposediin the position, shown in solid lines in Figs. 1 and 4, as will bethe bending bar 6 withits rack 8. The angle bar to-bebent is then insertedwithitsflange 5 distant from the form 3, and under the bars v6 and 23; as shown in solid lines in-Figs. 4, 5, 10, l2'and f 15.

The lever 41 is then swung to the position shown.

in Figs. 4, 10, 11 andlfi; and-asshown in dotted lines in Fig. l. to force downwardly the cam-plate 39', thus forcing downwardly the bar 33' which by its oblique 12 and 2c. The angle bar will thus beheld from longitudinal movement andfrom lateral bending away from the form 3.

The-lever tube 16 then swung from theinitiali position to the position shown in ,dottedlines in" Fig. 1; and'in moving to such position it :will cause the roller 22'to move the bendingbanfi with its rack 8 to the position shown in dotted linesin Figs.- 1 and-=-4, therebycausing-thebar 6 to bend the angle-ban'as'shown in dotted lines in Fig; 4;

This will cause the cam plate'4i) The lever tube 16 is then retracted to the initial position, and: the lever 41 is swung to the non"- clam-ping position, shown in'Fig. 14 and in solid lines. in. Fig. l. The angle bar can then be slid from between the formv 3, bar 6, bar 23 and block or it can be advanced tov a position at whichit may be desired: to make another similar bend.

Whenit is desired. to. bend an angle: bar witlr its flange 5. extending inwardly, thev lever tube 16v and: lever 41 are set in the initial; positions, shown in solid linesin Fig. 1, and the angle bar is insertedbetween the bar 6 and form 3 and betweenthe bar 23 and block 32 with the flange 5 extend.- ing away from the bending. bar 6. and. the bar 23'. The flange 5 is then clamped to hold the angle bar. from longitudinal movement by the following described. mechanism.

The. block. 32 is provided with a horizontal flange 42 against the under side of' which the upper side of the inwardly turned flange 5v is adapted to be clampedby a T shaped member 43, Figs. '7, 8, 9 and 11, the stem of which- T shaped member 43 extends through and is slidable in a hole provided throughv the tabletop The lower end of the stem of the member. 43

rests on ahorizontal. plate 44 having its ends vertically slidably en aging the armsof a U shaped:

bracket 45, said arms being iastenedto the under side of the table top 1, Fig. 7.

To the under side of the plate 44 is fastened a cam member 46 theunder side of which. is operatively engaged with the upper sideof a cam:

ber. 47 which is pivoted in the transverse portion of: the Uv shapedbracket. 45, the washer 48 resting on said transverse portion. 1

The cam. member 47 isprovided with a horizontal lever 50 pivotally connected to a link 51 whichis pivotally connectedwith an arm 52 with whichthe lever. 41 is provided.

When the lever 41 is swung from they initial nonclamping position, Fig. .14 and in solid lines in Fig. 1, itwillthrough the link 51 swing the lever 53 to the cl inping position,.shown in Figs. 4 and 11 and in dotted lines in Fig. 1. ber 47 will thus be swung so as to. lift the cam member 46,.which in turn will lift theiT shaped.

member 43 so as to clamp the flange'5 of theangle bar against the flange 42 of the block 32, therebyv holding. the angle-bar from longitudinal. movement.

The lever tube 16 is then swung from the initial position, solid lines inFigl to the dotted position in said figure, thus-causing the lever'tubeilfi' through the roller 22 and thebending bar 6 to Referring to Figs. 6'and 11, it will be noted that the form 3 is provided with an annular groove in. which are located one above the other and encircling the form 3 two rings 53 and 54, the uppe1':ring53'being'fastened to theunder side of the. gear wheel 9, the lower ring 54 being vertically slidable. from the lower "nonclampingposition, shown in Fig. 19 to the upper: position, shown in Figs. 6 and 20,. in which it is spaced from the ring53 a distance just sufhcient to admit between the rings the flange 5 of the. angle bar: Forso lifting the ring -54, as shown in Figs: 5 and 6,-a=p1a-te-55 is vertically-slidable. on the cyl-;

vertically The cam them-- inder 13 and supports the lower ends of vertical pins 56 which extend through and are vertically slidable in holes provided through the table top 1. The upper ends of the pins 56 support and lift the lower ring 54, when the plate 55 is lifted, as in Fig. 6. The plate 55 is held from rotating on the cylinder 13 by vertical pins 5'7 fastened to the under side of thetable top 1 and extending into holes 58 provided in the plate 55, Fig. 5.

Supporting and fastened to the under side of the plate 55 is a cam member 59 which in turn is supported and lifted by a lower cam member 60 revoluble on the cylinder 13 and resting on a washer 61 mounted on the flange 14 of the cylinder 13.

The cam member 60 is provided with a lever 62 pivotally connected to a link 63 which is pivotally connected to the lever 41, Figs. 1, 4 and 14.

When the bending member 6 engages the web 4 of the angle bar the flange 5 of which is at the inner side, Fig. 6, the bar 6 is disposed across the plane of the flange 5, so that it will hold the flange from being forced away from the form 3, thus preventing distortion to the angle bar, and the flange 5 will enter between the rings 53 and 54 and will thus be held thereby from buckling, the flange at the bend being smooth, as shown in Fig. 24.

After the bending operation, the lever tube 16 is retracted to the initial position, as is the lever 41, thus swinging the lever 62 so as to turn the cam member 60 to permit the latter and the ring 54 to lower.

When the flange 5 of the angle bar is at the outer side while being bent, the levers 50 and 62 will be swung when the lever 41 is swung to cause the bar 23 to clamp the flange, but the T shaped member 43 and the ring 54, though lifted, will be inactive insofar as to clamping the flange. When the flange 5 of the angle bar is at the inner side, the bar 23 will be inactive insofar as clamping the flange 5 is concerned, but it will hold the web 4 against the block 32 so as to prevent the web from being sprung away from the form 3.

The lever tube 16 may be oscillated by hand, or as shown in Fig. 1 it may be oscillated by power. For effecting this there is shown attached to the outer end of the lever tube 16 a block 64, Figs. 1 and 3, to which are connected one set of ends of two bars 65, the other ends of which are connected to a block 66 to the upper and lowe1 sides respectively of which are pivoted two links 6'7, the other ends of which are pivoted to a vertical pin 68 carried by an endless chain belt 69.

The chain belt is mounted and adapted for travel on two sprocket wheels '70 and '71, the latter being mounted on a vertical shaft '72 rotatable in a frame '73.

Sprocket wheels '74 are located intermediate of the sprocket wheels '70 and '71 in two concentric arcuate rows, the center of which is the axis of the lever tube 16, that is, the rod 12.

A pulley wheel '75 is fastened on and revoluble on the shaft '72 to which it is adapted to be connected so as to revolve therewith by a clutch mechanism '76 of any suitable type, said clutch being operatively actuated by a rod '77 which extends to near the lever 41, whereby the operator of the lever 41 can also operate the rod 7'7 to actuate the clutch to operatively connect the pulley wheel '75 with the shaft '72.

A-belt '78 connects the pulley wheel '75 with a pulley wheel '79 mounted on and rotatable with an armature shaft of an electric motor 80.

When the rod '77 is operated to connect the pulley wheel '75 with the shaft 72, the motor 80 through the belt '78 and pulley wheels and '79 rotates the shaft '72 and drives the chain belt 69. The pin 68 on the chain belt, through the links 6'7, block 66, bars 65, and block 64 swings the lever tube 16 from the initial position, shown in solid lines in Fig. 1, to the position shown in dotted lines, and then retracts the lever tube 16 to the initial position during each revolution of the chain belt 69. The operator stops the motor when the pin 68 is at the starting and stopping position shown in Fig. 1.

Any suitable support may be provided for the sprocket wheels. '70 and '74, as vertical pins 81 mounted on a platform 82, Fig. 1.

In the operation of the machine, when operated by the power mechanism described and shown in Figs. 1 to 3, and when operated by manual power alone, the parts are disposed as shown in solid lines in Fig. 1, with the bending bar 6 and the rack thereon alined with the clamping bar 23, the latter being shown in the raised released position shown in Fig. 15. At this time the clamping T shaped member 43 is in the lowered position, as is the lower clamping ring 54 onthe form 3.

The angle bar to be bent is then sli ped with its web 4 between the, bar 23 and block 32 and between the form 3 and the bending bar 6. If a bend is to be made with the flange at the outside, the flange 5 is disposed on the table top 1 in the groove 25 of the bar 23 and in the groove '7 at the under side of the bending bar 6.

The lever 41 is then swung from the position shown in solid lines in Fig. 1 and in Fig. 14 to the position shown in Fig. 4 and in dotted lines in Fig. 1, thereby through the cams 40 and 39 forcing the bar 33 downwardly, so that its inclined surface 35 engages the top of the bar 23 and forces the latter downwardly so that it clamps the flange 5 of the angle bar to the table top 1, and clamps the web 4 against the block 32.

The operator will then move the rod '77 longitudinally so as to cause the clutch '76 to engage the pulley wheel '75 with the shaft '72. The running motor 80 will then, through the belt '78, pulleys '75 and '79, shaft 72 and sprocket wheel '71 drive the chain belt 69. The pin 68 in traveling with the chain belt 69 will, through the bars 67 and 65 and blocks 64 and 66, swing the lever tube 16 from the position shown in solid lines in Figs. 1 and 4, to the position shown in dotted lines in said figures, and will then return the lever tube 16 to its initial position, at which time, the operator will, through the rod '77, operate the clutch '76 to release the shaft '72 from the pulley '75.

As has been described, the lever tube 16 in being swung from and to its initial position, will cause the roller 22 to engage the bending member 6 so as to oscillate the latter around the form 3 and bend the angle bar around the form, the member 6 holding the flange 5 of the angle bar against the table top 1 so as to prevent'the flange from being distorted.

When the angle bar is to be bent with the flange 5 thereof at the inner side, the angle bar is disposed with its flange 5 under the flange 42 of the block 32 and above the T shaped clamping member 43 and between the clamping rings 53 and 54, the ring 54 and the member 43 being in their lowered positions when the angle bar is inserted, the latter having its web 4 resting on the table top 1.

The lever 41 is then swung from its initial position, shown in Fig. 14 and in solid lines in Fig. 1,

to the position shown in dotted lines in Fig. 1, and in solid lines in Figs. 4 and 11.

The lever 41, so swung, will, through the cams 40 and 39, actuate the bar 33 to force the bar 23 to 5 the clamping position Fig. 7, in which the web 4 0f the angle bar will be held against the block 32. The lever 41 will through the link 51 and lever 50 actuate the cam 47 to lift the cam 46, plate 44 and T shaped clamping bar 43, thereby causing the latter to clamp the flange 5 against the flange 42 of the block 32, so as to hold the angle bar from longitudinal movement.

The lever 41 through the link 63, lever 62 cam 60 will lift the cam 59 and plate 55, pins 56 and clamping ring 54 so as to cause the latter to hold the flange 5 against the under side of the ring53 on the form3.

The operator will then operate the rod 77 to cause the clutch '76 to engage the pulley 75 with the shaft '72, thus, as has been described, driving the chain 69 so as to effect the swinging of the lever tube 16 from the initial position, shown in solid lines in Fig. 1 to the dotted position in said figure, and to then return the lever tube 16 to the initial position.

The lever tube 16, in swinging to the dotted position, Fig. 1, will cause the bending bar 6 to engage and bend the web 4 of the angle bar around the form 3, thereby forcing the flange 5 of the angle bar between the rings 53 and 54, as the flange is bent with the web, the bar 6, by backing up the web 4 at the horizontal plane of the flange 5, and the rings 53 and 54 will prevent the flange fr in becoming distorted and from buckling. The angle bar, being bent to the dotted position in Figs. 4 and 11, or to a predetermined position, determined by the resiliency of the angle bar, will, upon the retraction of the lever tube 16 and bending bar 6 to the initial positions, retract to the right angled, or other selected angular form.

The operator, after the retraction of the lever tube 16 and bending bar .6, will swing the lever 41 to its initial position, shown in Fig. 14 and in solid lines in Fig. 1, thereby releasing the angle bar from the clamping efiect of the bar 6, form 3, rings 53 and 54,' bar 23, block 32 and T shaped member 43. The angle bar may then be advanced to another position at which a bend is to be made, if such is desired, or'removed from the machine.

By providing the rack bar 8 on the bending bar 6 and engaged with the gear wheel 9, the bending bar is retained at all times in operative relationship to the gear wheel 9 and to the form Band operating roller 22. By having the teeth of the gear 'wheel 9 engaging thetop of the bending bar '6, as shown in Figs. 5 and 6, the bar 6 is held against the table top 1, thus preventing distortion of the flange 5, when the latter is at the outer side.

I do not limit my invention to the structure shown and described, as many modifications, within the scope of the appended claims, may be made without departing from the spirit of my invention.

What I claim is:

1. In a bar bending machine, aform having an arcuate surface against which the web of an angle bar is adapted to be bent, and having'an arcuate row of teeth concentric with said surface, a bending member adapted for circumferential movement around said form and having a straight 'row of teeth engaged with the teeth of said form and having a longitudinal bearing surface of substantial length spaced from said arcuate surface and adapted for bearing at one time for a substantial-distance lengthwise of said bar against the side thereof distant from said arcuate surface, and means for imparting to said member said circumferential movement, said member having means for receiving and engaging the flange of said bar for holding said flange from buckling when the bar is bent with the flange at the outer side thereof.

2. In a bar bending machine, a form having an arcuate surface against which the web of an angle bar is adapted to bent, and having an arcuate row of teeth concentric with said surface, a bending memb r having a longitudinal bearing surface of substantial length spaced from said arcuate surface and adapted for bearing at one time for a substantial distance lengthwise of said bar against the side thereof distant from said arcuate surface, said member being adapted for circumferential movement around said form and having a straight row of teeth engaged with said teeth of said form, and a lever pivoted concentrically with said arcuate surface and having means for engaging and imparting said circumferential movement to said member, said member having means for receiving and engaging the flange of said bar for holding said flange from buckling when the bar is bent with the flange at the outer side thereof.

3. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, a bending member'adapted for circumferential movement around said form and having a longitudinal bearing surface of substantial length spacedfrom said form and adapted for bearing at one time for a substantial distance lengthwise of said bar against the side thereof distant from said form, said member having toothed engagement with said form, the latter being stationary,

means for imparting circumferential movement tial length spaced from said form and adapted for bearing at one time for a substantial distance lengthwise of and against the side of said web distant from said form, and having means for engaging the flange of said bar to hold the flange from buckling when the bar is bent with the flange at the outer side thereof, and means adapted to releasably engage and hold said flange, when it is so disposed, for holding the bar from longitudinal movement during the bending operation.

5. In a bar bending machine, a form against which the web of an angle bar is adapted to bear and be bent, and a bar bending member-adapted for circumferential movement around said form and having a longitudinal bearing surface of substantial length spaced from said form and adapted for hearing at one time for a substantial distance lengthwise of and against the side of said web distant from said form, and having means adapted to releasably engage the flange of said bar at one side and one edge to hold the flange from buckling when the bar is bent with the flange at the outer side thereof, said member, where it is nearest its said form, being spaced therefrom substantially only the thickness of said Web.

6. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, a support for the flange of said bar, and

a bar bending member adapted for circumferential movement around said form and having a longitudinal bearing surface of substantial length spaced from said form and adapted for bearing at one time for a substantial distance lengthwise of and against the side of said web distant from said form, and having means on the side next to said support for engaging the outer edge and the side of said flange opposite to the side resting on said support to hold said flange from buckling when the bar is bent around said form with the flange of the bar at the outer side thereof, said member, where it is nearest said form, being spaced therefrom substantially only the thickness of said web.

7. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, a support for the flange of said bar, and a bar bending member adapted for circumferential movement on said support around said form and having a longitudinal groove in the side next to said support adapted to receive said flange, said groove forming with said support a channel into which said flange is adapted to be fitted so as to be held from buckling when the bar is bent around said form with the flange of the bar at the outer side of the bar, said bar having a longitudinal bearing surface of substantial length spaced from said form and adapted for bearing at one time for a substantial distance lengthwise of and against the side of said web distant from said form.

8. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, means for engaging the sides of the flange of said bar to hold said flange from buckling when the bar is bent around said form with the flange at the inner side of the bar, and a bar bending member having means engaging said form which holds said member from longitudinal movement said member being adapted for circumferential movement around said form and having a bearing surface of substantial length spaced from said form and adapted for bearing at one time for a substantial distance lengthwise of and against the side of said web distant from said form, said member, where it is nearest said form, being spaced therefrom substantially only the thickness of said web.

9. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, means for engaging the side of the flange of said bar to hold the flange from buckling when the bar is bent around said form with the flange at the inner side of the bar, and a bar bending member having means engaging said form which holds said member from longitudinal movement said member being adapted for circumferential movement around said form and having a bear ing surface of substantial length spaced from said form and adapted for bearing at one time for a substantial distance lengthwise of and against the side of said web distant from said form, said bearing surface extending in width across said flange holding means a distance suflicient to enable it to hold said flange from outward movement during the bending operation.

10. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, means for engaging the side of the flang of said bar to hold said flange from buckling when the bar is bent around said form with the flange at the inner side of the bar, and a bar bending member having means engaging said form which holds said member from longitudinal movement said member being adapted for circumferential movement around said form and having a bearing surface of substantial length spaced from said form and adapted for hearing at one time for a substantial distance lengthwise of and against the side of the web distant from said form, said member having means for engaging said flange and holding it from buckling when the bar is bent around said form with its flange at the outer side of said bar.

11. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent with the flange of the bar at its inner or outer side, means for engaging said flange to hold it from buckling when the flange is at either the inner or outer side of the bar, means for holding the bar from longitudinal movement during the bending operation, and a bar bending member adapted for circumferential movement around said form and having a bearing surface adapted for bearing engagement with said web at the side distant from said form.

12. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent with the flange of the bar at the inner or outer side thereof, means for holding the flange from buckling when the flange is at the inner side of the bar, means for holding the bar from longitudinal movement during the bending operation with the flange at the inner or the outer side of the bar, means for simultaneously operating the bar holding means and the flange holding means, and means for engaging the outer side of said web and bending the bar around said form with the flange at the inner or the outer side of said bar and having means for engaging the bar in the plane of the flange when the flange is at the inner side to hold the flange from movement outwardly from said form and provided with means for engaging and holding the flange from buckling when the flange is at the outer side of the bar.

13. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, with the flange of the bar at the inner or outer side thereof, means for engaging the flange of the bar, when the flange is at the inner side, for holding the flange from buckling, means for engaging the flange when at the inner side to hold the bar from longitudinal movement, means for engaging the flange when at the outer side for holding the bar from longitudinal movement, means for simultaneously actuating said three flange holding means, and means for engaging the outer side of said web for bending said bar around said form when the flange is at either the inner or outer side and having means for engaging and holding said flange from buckling when the flange is at the outer side.

14. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, means for engaging and holding the flange of the bar from buckling when the bar is bent with the flange at the inner side thereof, and a bar bending member having means engaging said form which holds said member from longitudinal movement said member being adapted for circumferential movement around said form and having a bearing surface of substantial length adapted for bearing for a substantial distance against the side of the web distant from said form, said bearing surface being intersected by the radius which intersects that portion of the web which at the time is being bent and against which at the time the said surface is bearing.

15. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, means for engaging and holding the flange of the bar from buckling when the bar is bent with the flange at the outer side thereof, and a bar bending member having means engaging said form which holds said member from longitudinal movement said member being adapted for circumferential movement around said form and having a straight bearing surface of substantial length adapted for bearing for a substantial distance against a straight side of the web distant from said form, said bearing surface being intersected by the radius which intersects that portion of the web which at the time is being bent and against which at the time the said surface is bearing.

16. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, means for engaging and holding the flange of said bar from buckling when the bar is bent with the flange at the inner side of the bar, and a bar bending member having toothed engagement with and adapted for circumferential movement around said form and having a longitudinal bearing surface of substantial length adapted for bearing for a substantial distance against the side of said web distant from said form.

17. In a bar bending machine, a form against which the Web of an angle bar is adapted to be bent, and a bar bending member having toothed engagement with and adapted for circumferential movement around said form and having a longi tudinal bearing surface of substantial length adapted for bearing for a substantial distance against the side of the web distant from said form, said member having means for receiving and holding the flange of said bar from buckling when the bar is bent with the flange at the outer side thereof.

18. In a bar bending machine, a form against which the web of an angle bar is adapted to be bent, a bending member having toothed engagement with and adapted for circumferential movement around said form and having a longitudinal bearing surface of substantial length spaced from said form and adapted for bearing at one time for a substantial distance lengthwise of said bar against the side thereof distant from said form, and means for imparting to said member circumferential movement, said member having means for receiving and engaging the flange of said bar for holding said flange from buckling when the bar is bent with the flange at the outer side thereof.

CARL KIRCHNER.

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