US1287750A - Machine for bending flanged bars. - Google Patents

Description

A. F. RE'ICHERT &1.P|cHLER.

MACHINE FOR BENDING FLANGED BARS.

APPLICATION FILED FEB. 14. 191e.

Patented Dec. 1T, '1918.

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Y ATTORNE YJ A. F. REICHERT & l. PICHLER. MACHINE FOR BENDING FLANGED BARS.

APPLICATION FILED FEB. H. i916- Iutented D00. 17, 1918.

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AUGUST F. REICI-IERT AND'JOSEF PICI-ILER, `OIE MILWAUKEE, WISCONSIN.

:MACHINE non BENDING. FLAiveEn Bans To all 'whom it may concern: j Y

Be 1t known that we, AUGUST F. REICHERT and Josnr FICHLER, citizens ofthe United States, residing at Milwaukee, county vof Milwaukeea11d State of Wisconsin, have invented new and useful Improvements in Machines for yBendingFlanged Bars,*of which the following` is a specification.

Our invention relates to improvements in machines for bendingllanged bars.

The object of our invention .isto'provide simple, durable andvellicient machine'for bending flanged bars ofdifferentisizes; also to provide means whereby the bars'may be subjected to rebending operations in the saine machine; also to providemeans whereby a anged bar of anyk desiredlengthmay be bent circularly to form airing or set of rings of the desired diameter, the bending operation being continuously performed `regardless of the number ofrings to be pro duced from the bar.

A further object of our invention kis to.

provide a form of machine'which maybe easily and quickly adjusted to overcome'distortion, to vary the degreeofv curvature or to accommodate bars which differ in size and thickness.

In the drawings- Figure 1 is a plan view of a bending machine for flanged bars embodying our invention.

Fig. 2 is a front elevation of the same with a portion of the frame partially broken away to show the actuating mechanism.

Fig. 3 is a view of the table top as seen from the under side, showing .the actuating mechanism.

Fig. 4 is a longitudinalsectional view of one of the adjustable rollers for applying vertical pressure to theflanged bar during the bending operation.

Fig. 5 is a detail sectional view of the adj ustable bending roller, drawn on line .cvzr of Fig. 2.

Fig. 6 is a similar view of the adjustable compression roller.Y

Like parts are identified by the samereference characters throughout the several views. A I

. A table 1 is mounted 'upon a supporting bed frame 2 and is provided with a notch 3 `in its front-v and top margin,the -walls of which serve as a guidefor the bars which, for convenience in description,.may be assumedto comprise commercial angle Airon bars or strips, one of whichisindicated by are held down upon V10 is an idle roller.

V Specification ofiLtters Patent. Patented Dec, 17, 219128, l

Application filed February 14, 191e. semi No; 73,185.

dotted vlines a in Fig. 1. The bars a vare fed through the notch 3, the'base `of which preferably has anl upward inclination from the margin of the table inwardly. The bars the table by anA adjustable roller 5 adapted to bear upon the upper margin of the vertical flange. HAfter passingunderneath the roller 5, the advancing end of the bar passes over an antiefricvtion idlefroller 7 Vand its vertical flange then passes between the peripheries ofa setof compression rollers 9 and 10.' The com-- I pression roller 9 is positively driven, as hereinafter explained, and serves to feed the stock, (the flanged bar to be bent), rearwardly after its vertical flange has been engaged between the compression rollers 9 and 10,k its horizontal flange being also engaged either between roller 9 and roller 7 o r. between the roller V1() and roller 7. Theroller Its verticalshaft 13 is mounted in supporting bearings 14 which rslide in a suitable guide way 15 formedin the table top. The bearings 14 are pushed inwardly by means of an adjusting screw 17. A spring 18 is interposed between the inner end of the adjusting screw and the 'i' bearing member 14, the spring being provided with a cap 19 against which the adjusting screw 17 directly bears. YThe'screw 17 has threaded engagement with the table and is manually actuated by means of a han-v `dle 20.

Between the compressionroller 10 and the roller 5, an idle guide roller 25 is mounted upon a vertical axis, this roller being preferably located in a socket 26 formed in the table top, whereby the lower surface of this roller is brought more nearly on a level with the inclined base ofthe notch 3 along which the stock is fed. This roller 25 is so arranged that its periphery will bear against the stock and relieve the friction which would otherwise be exerted against the vertical wall at the right hand side of the notch 3, after the bending operation commences, the wall of said notch 3 and said roller 25 serving `to prevent the in-feeding portion yof the stock from swervingto the fight when the other end portion of the var explained.

- The bending operation is performed by ymeans of: a bending roller 27 whichacts in direct c'operation with the compression rollers9 and 10. Assuming that an angle is being bent to theleft, as hereinafter iron baris beingfed betweenthe comprese '-1'.

` pression roller 9. The

vually operated handles tively, whereby they may be adjustablv rothereon may be raisedY or lowered.

sion rollers 9 and 10, as shown by dotted lines in Fig. l, itis obvious that when such a bar strikes the bendingyroller 27, it will be deflected to the left, owing to the fact that the bending roller occupies a position with its peripheral portion on the left hand side of the line along which. the bar travels through notch 3 to the compression rollers.

The axis of bending roller 27 is tothe right of said line and therefore the stock will be deliected to the left and caused" to pass over the diagonal roller 30 which is also an idle roller adapted to revolve upon a horizontal axis. The shaft 29 of the bending roller 27 is journaled in a forked bearing member 33, adaptedto Slide in a suitable guide way 34 formed in the top of the table. lt isadjusted along said guide way by means of an adjusting screw 35, and when inthe desired position of adjustment, is rigidly secured in such a position by means of a bolt 36 which passes through a slot' 37 formed in the bottom of the guide way 34. rlhe degree of curvature imparted to the stock may therefore .be varied by loosening the bolt 3G and retracting or advancingthe adjusting screw 35.

The function of the diagonal roller 30 is not only to relieve friction of the stock upon the `top of the table, but to correct distortion. i Owing to the fact that the stock A has a horizontal flange as well as a vertical fiange, it is necessary to stretch the vertical flange and compress the horizontal flange when the latter is'passed under the conistretching operation is largely performed by the pull exerted by the periphery of roller flange to draw it between the base of the notch 3 and the initial guide roller. The rear end of the bar during this operation tends to bend downwardly, but is prevented from doing so by the roller 30. which is located at a sutlicient distance from the coinpression rollers 9 and 10 to easily counteract the downwardly bending tendency. Further, the rollers 5 and 30 are each mounted upon supporting stationary shafts 40 and 41 respectively, and said shafts are eccentric within the roller 5 (or 30), as shown 'at 42 in Fig. 4. This view kshows the shaft 4l, but it will be understood that shaft 40 is similarly constructed. These shafts are normally stationary but are provided with mane and 44 respectated or oscillated upon their` axes. When these shafts 40 and 41 have been thus adjusted to the desired position. they may be locked in such position by any` suitable means, such, for example, as the set screw 47. In each case. the roller 5, or 30, rotates upon the eccentric portion of the shaft.V and by adjust-ing the shaft, the roller supported The lbracket 55. The `is provided with interposed between this bolt head and the 9 upon the vertical the vertical vbetween it and roller of these corrugations may be sufficiently ling roller 5, is mounted in a sleeve bearing Ymember supported by a vertical post 5l,

which extends through a hole in the table and through atubular boss-52 depending from the table top. The bearing sleeve 5() may be raised 0r lowered and it also may be rotatively adjusted about the axis of the post5l. To facilitate raisingand lowering the post 51 and sleeve 50, we provide the sleeve with a bracket 55 having a segmental slot 56 therein through which an adjusting screw 57 passes, the lower end of the screw having threaded engagement in a socket or hole formed in the table top underneath adjusting screw or bolt 57 a head, and a washer is bracket. rllhe portion of the bolt which passes through the slot 56 is reduced in size, the larger portion of the bolt below the bracket forming a shoulder upon which the bracket rests. Therefore, by rotating the bolt in its threaded bearings in the table top, it may be raised or lowered andV will carry with it the bracket 55 and sleeve The sleeve 50 is held in any desired position of rotative adjustment by a set screw 60. which has threaded bearing in the table top and which enters a hole in the boss and is provided with a shoe 6l therein adapted to be pushed by the screw G0 into clamping engagement with the post 5l. The screw (i0 will of course be adjusted to release the shoe from such clamping engagement whenever the sleeve 50 is to be adjusted, either rotatively or vertically. The rotative adjustment may be accomplished by simply taking hold of the sleeve and swinging it to bring the roller 5 to the desired position. while adjustment is accomplished, as above explained, by means of the bolt or 'screw 57 in swiveling engagement with bracket 55.

Power is applied to the compression roller 9 through a pulley 70, clutch 71, shaft 72, worm 73 thereon, (Fig. 3). worm wheel '(4, pinion 75 and gear wheel 7 6, the latter lieing fixed to vertical shaft 77 which carries compression roller 9. The periphery ot' roller 9 is corrugated or milled to enable it to grip the vertical flange of the angle bar 10. The teeth or ribs sharp to enter the vertical flange under the heavy pressure exerted thereon and thus feed the stock rearwardly with snlieient force to bend it when it comes in Contact with the bending roller 27. A. lever 3U is sulning. that the angle bar is to be bent in the direction of the horizontal flange, the feed controlling or initial roller 5 will. first be adjusted to its proper position over the notched or inclined way 3, so-that it will bear upon the upper margin of the vertical flange when the angle bar is fed inwardly through said notch. Roller 5 may be raised by adjusting its cam shaft so that the bar may be initially pushed underneath the roller 5 l5 and over the roller 7 to a point where its vertical ange is brought in Contact with the rollers 9 and l0, the horizontal flange passing under the roller 9. The machine may then be started, whereupon lever 44 will be swung to force the roller 5 into pressure contact with the upper margin of the vertical flange of the stock as soon as the end of said flange has been engaged between the compression rollers. The roller 9 will then l operate to draw the stock, i. c., the angle bar over the roller 7 and between the rollers 9 and 10, but since the fiat under surfaces of rollers 9 and 10 occupy horizontal positions,

whereas the stock is fed inwardly along the incline provided by the recess or notch 3, it is obvious that the stock will be bent into a substantially horizontal position while passing over roller 7. This `operation stretches the metal in the vertical flange. As soon as the advancing end of the stock comes in contact with the roller 27, 'it will be deflected Vto the left. The vertical flange will of course bend in substantial conformity with the periphery of the roller 9 immediately beyond the point where such vroller approaches most nearly to roller 10. The horizontal flange will be compressed by this bending operation,.the greatest compression taking place along its margin. Roller 9,

" however', will be located so closely to the table top as to prevent this flange from buckling. The compression therefore results in merely thickening this flange or widening ithorizontally, and also densifying the material appreciably where the grade of material used will permit.

Owing to the fact that the inclined base of the notch or recess 3 leads to an apex formed by the roller 7 over which the stoclr is being continuously bent-toward the horizontal p0- sition while being fed between the compression roller, the rear Vend of the stock will tend to bend downwardly. This tendency, however, will be overcome, not only by the table top, but by the roller 30 over which the stock passes after its advancingend has reached this roller. The roller 30, by lifting the rear end of the stock, causes the stock to become bridged across the space between the rollers 7 and 30 and the under surface of the compression roller 9 thereupon becomes flange *from buckling along its inner mar-v gin, by .reason the heavy pressure ,exerted upon tS upper surface by the roller 9. There the stockY is of sufficient length, a complete ring may be formed, or if desired, the operation may be continuous with stoel: of sufiicient length to form a series of rings. In such case, the stock will be bent in the form of' aheliX, the end initially passed between the compression rollers describing a complete circleV and passing over the rollers in making the second turn. To vary the curvature, roller 27 will be adjusted inwardly ,or outwardly, as above explained. The adjustment of roller 10 will be made simply to vary the pressure.

It will be observed that the notch 3 has a curved left hand wall lead-ing inwardly inthe tabletop along a curved line which converges toward the straight right hand wall. This form of the notch is desirable, for the reason that curved bars may be fed into the machine at times in order to change their curvature, and when this is done, the curved form of the left hand side of the .notch permits these bars to be fed inwardly along the incline-with the same facility that the straight bars may be fed. We attach great importance to the provision of means for feeding these angle barsinwardly to the compression rollers along an incline and bending them over an apex, such as is former-1hr the Vroller 7, Since kbyso doing We `are able to stretch the metal in the angle formed bvfthe two flanges. suiiiientlv t0 per-init the bending operation Without buckling. YVe are enabled inthe operation of our machine to bend straight angle iron bars into circular form, producing Vrings of comparatively ksmall diameter, with substantially smooth surfaced or unbuckled horizontal and vertical flanges. We are also able'to prevent the flanges from defleetingv from their respective horizontal and vertical positions, whereas in other bending machines, so far as we are aware, great difficulty has been experienced in preventing the flanges from assuming inclined or distorted positions and in preventing them from buckling, the latter difiiculty being -principally experienced in the horizontal flange.

Qur machine iS equally adapted forbending anslelcers into circular form with the horizontal flange Outer-most- Wherc this is done, the horizontal flange passes under, seeth the rollers-25, 1,0 and 27- The vertical lianes ,passes between the compression i011- -ers Qtand 1.0 in the Samemennei". as above described The three rollers 2.5, 10 and27 preventtheherizental 11a-lise. from Wer-ping or twisting upwardly and the stretching operation takes place principally at the bending point immediately back of the point of nearest approach of rollers 9 and 10. In this operation also, the passing of the stock over the apex formed by the roller 7, greatly facilitates the operation of stretching the bar without permitting the flanges to twist or warp out of place.

Ve claiml. A bending machine for angle bars, including the combination with a table, of a set of compression rollers mounted thereon and adapted for pressure engagement of one bar flange between them, said rollers being located in sufficiently close proximity to the table to receive another flange between either of them and the table, 'an adjustable bending roller located in the rear of said compression rollers in the path of bars passing between such rollers, an adjustable guide roller adapted to hold the bars to be bent upon the table in front of the compression rollers, and

an intermediate idle roller between the guidel roller and the compression rollers over which said bars may pass, the upper surface of the table being inclined between said idle roller and the guide roller, together with a horizontally revoluble idle roller adapted to hold said bars against lateral swinging movements during the bending operations performed on the opposite side of the compression rollers by saidbending roller.

2. A bending machine including the combination with a table having an inclined top surface and a. horizontal top surface, of a set of compression rollers revoluble upon vertical axes above the horizontal surface and adjacent to the inner end of the inclined surface, a bending roller located in the path of the bars passing between the compression rollers and an initial guide roller adapted to hold the bars down upon said inclined surface while they are being drawn over the same by the compression rollers and progressively bent by said bending roller, together with a rear guide roller adapted to revolve upon a horizontal axis in the'path of tthe bars passing the bending roller, whereby said bars may be lifted above the surface of the table between the compression rollers and said rear guide roller to faciliate the shaping operations.

3l A bending machine including the combination with a table having an inclined top surface and a horizontal top surface, of a set of compression rollers revoluble yupon vertical axes above the horizontal surface and adjacent to the inner end of the inclined surface, a bending roller located in the path of the bars passing between'the compression rollers and an initial guide roller adapted to `held the bars down upon said inclined surface while they are being drawn over the same by the compression rollers and progressively bent by said bending roller, together with a rear guide roller adapted to revolve upon ai horizontal axis in the path 0f the bars passing the bending roller, whereby said bars may be lifted above the surface of the table between the compression rollers and said rear guide roller to facilitate the shaping operations, said rear guide roller being vertically adjustable to vary the degree of the lifting operation in correspondence with the requirements of the material.

4f. A bending machine for angle bars, comprising the combina-tion with a supporting table, of compression rollers, means for actuating one of said rollers to feed angle barsbetween them', said rollers being arranged to receive the vertical flange between their peripheries and the horizontal flange between their under surfaces and said table top, a bending roller having a peripheral portion in the path of bars which pass betweenthe compression rollers, and adjustable means for applying an upward pressure to said bars in the rear of the bending roller, whereby they may be lifted from the table top in the rear of the compression rollers, together with means for depressing said bars on the feeding-in side of the compression rollers below the plane of the table top.

5. A bending machine for angle bars, comprising the combination with a table, of an actuating roller mounted to revolve horizontally above the surface of the table and having gripping teeth on its periphery adapted to engage one flange of the bar, a coperative compression roller having its periphery in close proximity to said gripping teeth, means for permitting said'rollers tosepayrate, means for resiliently opposing separating movements thereof, said rollers being adapted to receive the vertical flanges of angle bars between their peripheries and to also receive horizontal flanges between their under surfaces and said table top, means for guiding angle bars between said rollers, and

means for progressively and continuously bending such bars in one direction in the angle formed by the diverging peripheries of said rollers as the bars move between them7 said bars being forced rearwardly between said rollers by the gripping action of said teeth and by the frictional contact of the rollers upon the bar surfaces, together with means for bending said bars downwardly on the iii-feeding side and upwardly on the out-feeding side of said rollers.

In testimony whereof we affix our signatures in the presence of two witnesses.

AUGUST F. RECHERT. JOSEF PICHLER. Witnesses:

Lnvnnn'r'r C. WHEELER, RMA D. BREMER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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