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Publication numberUS1512002 A
Publication typeGrant
Publication date14 Oct 1924
Filing date11 Jul 1922
Priority date11 Jul 1922
Publication numberUS 1512002 A, US 1512002A, US-A-1512002, US1512002 A, US1512002A
InventorsTheodore Kardong
Original AssigneeTheodore Kardong
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Stirrup-bending machine
US 1512002 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct. 14. 1924.

T. KARDON@ STRRUP BENDNG' MACHINE Filed July 1l, 1922 5 Sheets-Sheet 1 TMW INVENTCDRl wrrNEssEs ATTORNEY Oct. 14. 1924. 1,512,002

T. KARDONG l STIRRUP` BENDING MACHINE www /fi/ BY I Oct. 14. 1924.

1,512,002 T. KARDONG STIRRUP BENDING MACHINE Filed July ll 1922 5 Sheets-Sheet 3 WITNESSES Mw @m ATT'RNEYl Oct. 14. 1924. 1,512,002

` T. KARDON@ `STIRRUP BENDING MACHINE Filed July l1 1922 5 Shee'ts-Sheet 4 76 m M 8f@ Oct. 14. 1924. 1,512,002

T. KARDON@ STIRRUP BENDING MAcHlNE Y Filed Jul-y ll. 1922 5 Sheets-Sheet 5 INVENTOR,

ATTORNEY 'n Patented oa. 14, 1924.

UNITED STATES PATENT OFFICE.

THEODORE KAR-DONG, OF MINNEAPOLIS, MNNESOTA.

Application filed July 11, 1922. Sera] No. 574,275.

T 0 all whom t 'may coi/warn.'

Be it known that I, Trrnononn lAnDoNe. a citizen of the vUnited States, residing at Minneapolis. in the county of Hennepin and State of Minnesota, have invented a new and useful Stirrup-Bending lVlachiue.y ot which the following' is a speciiication.

This invention relates to machines for bending metal rods, bars and the like, and the subject-matter of this application is a continuation in part of my application iled July 21, 1920, Serial No. 397,855, for a stirrup bending machine.

The embodiment shown in the drawings for illustrative purposes, is especially designed Jfor bending stiriups used for supporting beam ends in concrete and other building constructions, but it will be understood that the machine is capable of general use in bending metal bars or rods for various purposes.

@ne ot the objects of my invention is to produce a machine of this character that is capable of bendingl a plurality ol' rods or bars simultaneously, bending as many as twenty bars in a single operation.

Another object is to facilitate the formation of a plurality of bends, in different directions. in the same rods or bars, and without reversing the bars.

A. Jfurther object is to produce a light and powerful power-driven bending machine which may be easily operated and controlled by a single attendant, the machine being equipped with gages to insure accuracy as well as speed of operation.

@ther objects will appear in the specilication which should be read in connection with the accompanying .drawings wherein Figure 1 showing a pl forr bending.

Fig. 2 is an end elevation taken from the right hand side of Fig. 1, some of the parts being omitted.

Fig. 3 is a top plan view.

Fig. 4 is a plan view showing enough of the machine to illustrate thefirst bending operation on a stirrup blank.

Fig. 5 is a section of a detail.

Fig.

side elevation of my machine lll is a

urality of stirrups d 6 is sectional. view takencn the line 6 6 of Fig. 1, showing the stirrups connected by clips. f

Fig. 7 is a vertical longitudinal sectional view 7taken on line 77 of Fig. 3.

position.

Fig. 8 is an end elevation partly in section taken from the left hand side of Fig. 3.

9 is a top plan, certain parts being omitted, and showing the last bending operation on a stirrup blank.

Fig. 1G is a sectional detail taken on line 4ifi-i0 of Fig. 9.

Fig. 11 is a sectionaldetail taken on the line 11-11 of Fig. 9.

Fig. 12 is a sectional view taken on the line 12-12 oi Fig. 9.

Fig. 13 is a sectional View taken on line 13-13 of Fig. 7. y Y

Fig. 14. is a modiiication of the construction shown in Fig. 5, with the parts slightly separated to maire clear the oiling system.

Fig. 15 is a detail side view to illustrate the mountingo the channel bar and iron reinforcement.

Fig. 16 is a detail plan view showing the bending lugs and the action of the roller in bending the material.

Fig. 17 is a plan view of the hub and showing' the curved channel which catches the scales and dirt dropped from the material 'being bent.

Fig. 18 is a detailside view partly in section, showing the beveled face of thel top and the headed bolt which travels in the curved channel.

Fig. 19 is a side view of the headed bolt.

Referring in detail to the drawings, which show the preferred lorm of my invention` l have shown a main .trame comprising four upright posts or columns 1 preferably made ot steel angles. upper and lower longitudinal beams v2 and 3, respectively, and upper and lowerl transverse beams 4L and 5.

Upright columns 6 are suitably secured to the beams 2 and 3 for strengthening purposes. Suitable braces 7 are secured to the upper and lower ends of the columns 1 on the sides and ends of the frame to prevent racking or" the frame.v The end beams 5 are secured to the lower ends of the columns 1 soy that oneleg of the angle extends beneath the lower ends thereof, as is clearly shown in Fig. 7. e.. Htransverse channel beam 8, preferably having. an iron plate 9 closely fitted in its open side and. secured to the web if the channel by bolts 10, has its ends enthe lower edges of the beams 2 and is secured to a top plate 11 as by bolts 10a passing through the tabletop. (Figs. 7 and This beam has an important 'function to perform'as will bex later explained.

llO

' same being cut to fit and to rest upon theupper surface ot the horizontal Wingof the said angle iron members, the upper face 01' the planks lying flush with the upper edofes of the vertical wings oi the irons 2 and 4 and' extending 'from one sideA oi the machine to the other and under the top plate 11, as clearly vsho'tvnin Figure 7 of the drawings.

The top 11 is preferably of Crucible steel and is suitably secured to the side and end beams 2 and 4 by rivets or bolts, and has av thickened and raised portion 12 intermediate the sides and ends. (Figs. 7 and 9.) Tivo vertical spaced, bending lugs 13 are integral with the raised portion 12 and tcp 11, and have fillets or Webs 12a, integral with the lugs and raised portions, for the purpose of bracing or strengthening the lugs. Each oi" the lugs 13`is substantially a right triangular prism7 (Figs. v3l andV 16)',y the adjacent opposed aces of which are straight and parallel. The front edges 14 of they bending lugs arehrounded so as not to present a sharp corner te the material being bent.

boss or centralized drop 15 integral With the lower side of the top plate at. the raised porti-on 12 and extending vertically below the center oi'. the space between the lugs 13, is suitably bored to provide a jour nal bearing for thev upper reduced end 1.6 oia vertical shaft 16a', mounted in a step bearing 17 at its lower end, the bearing being secured to a transverse channel beam 18. (Figs. 5, 7 and 14.) The sliatt 16C* is provided Witlj'i a key 1Gb below the reduced end 16 Where vfitting intol the bore of the hub 19 of a bending head or bracket 20, `which hub is suitably bored and provided ivithva groove Yfor the reception oit the key 1,6" and rotates on the drop l5', the outer diameter ci' which is substantially the same as that of the vertical shaft 16a (Figs. t3 and 7 The vbracket or head 20 is made in one piece and comprises the hub 19, radial arm 21, and aA verticalarm 21a having an upper horizontal arm' 252 overhanging the radial arm 2.1; The bracket 2O entends upwardly throughV arcuate slot in the top boards 11a of the table immediately in front of the bending' lugs 1.3. i square headed vertical pin Q4 whichv passes through the overhanging arm 22. and the radial arm y.2.1 of the bracket. or head 2`O`., carries a bending roller 2 5 having' a lower reduced end (Fig. 7.) The arcuate edge of plate 11, bordering the slot 2.3. and adjacent the roller 25, is preterably beveled at 27 igs. 7 and 18), toY cause rust andv scale dropping from the metal being bent to falll freely' below' the. roller.

The upper plane face et the radiall arm 2i has an arcuate channel-shaped groove '23 open at each end, (Fig. 17), which accommo dates the 'lil-head of stud bolt 29, screwed in a lug 29a projecting from the beveled portion 27 et the 'plate 11. As the rust and scale drops from the bevelediace 27, it is caught by the radial arm`21 and Works into the groove 28, and as the radial armthrough the' table top 11 for the purpose of oiling the upper bearing of shaft v16?* (see Figs. 5'.. 7 and 14). The plug may be removed and the hole filled With oil, Which linds its Way throughout the bearingsurface of the journal vand hub, inside and outside the centralized drop 15. Fig. 14 shows a modiiied torni ot bearing,..the .parts being slightly separated to disclose the pathot the oil.

It will be noted that the voil entering' at the opening 31 travels along the path between the parts 16 and 12, u'ntii it reaches its highest level. As this is the principal bearing oit the machine, it is important that it should be kept. Well lubricated.

The driving' mechanism for the bending arm preferably comprises a horizontal drive shaft 32 mounted in bearings 33, suitably secured to the end columns of the frame, said shaft being arranged to drive thc vertical' shaft 1Ga through a train of reduc-v tion gearing. Shaft 32 projects beyond one side of the trame and carries a friction puiley 34 keyed thereto, and normally idle pulleys 35 and 36, connected to any power shaft and driven iny opposite directions.l y

cooperate With the pulley 34 to drive the shaft 32 in either direction. The inner surface olf the periphery of each idle pulley is adapted to irictional'ly engage the adjacent conoidal periphery oi" the 'friction pulley 34, thus acting as a :friction clutch. (Fig.

The preferred system of reductie-;

ing coin-.prises a Worm 38 keyed to shameshing with a Worm Wheel 39, keye y a vertical shaft 40, having end bearings L1, and also having a small spur gear 42 keyed thereto and meshing with alargespur 43 keyed to shaft 16'. The loiver journal bearing 41 is secured to a' transverse channel beam 18a, and tl'ieupper bean ing 41 iss-ecured tca similar channel beam 18a. (Figs. 1, 7 and 8.) Thus, because oi the great reduction in speed, the povver enjerted by the bending means is cerrespon'dingl'y increased'. i

Each oi" the pulleys so andv 36' carries a hub 44, having an annular groove to receive a yoke 46 of a pulley shifting mechanism. The yokes 46 are each secured to an arm 47, adjustably carried on a reciprocable bar 48, which is slidably mounted in guides 49 secured to the end columns of the frame. A rack 50 is adjustably secured to bar 49, and is adapted to meshl with a segmental gear 51 fast toa longitudinal, oscillatable shaft 52 mounted in convenient bearings on the frame. (Fig. 8.) Two bell cranks 53 and 54 integral with a collar 55 are secured to the shaft 52. Links 56 and 57 connect the bell cranks 53 and 54 with treadle levers 58 and 59, respectively, which are pivotally mounted to the frame, as at 69. A slotted treadle lever guide 60a is secured to one of the columns of the'frame. By pressing on the appropriate lever, either one of the idle pulleys 35 or 36 is shifted into clutching engagement with pulley 34 to rotate the bending arm 20 in the desired direction. (Figs. 2 and 3.)

In order to maintain the pulleys 35 and 36 in normally idleposition, I have provided an arm 61 secured to the shifter bar 48, and having a head 62 provided 'with outstanding' lugs 62a in horizontal alinement with threaded bolts 63 which are threaded into suitable brackets 64 0n the main frame. Compression springs 65 have terminal engagement with the lugs 62a and the bolts 63, each spring being arranged between adjustable nuts 66 on the bolts and the head 62, and acting in opposite directions, so that the compression of the springs will normally hold the head 62 controlling thev shifter bar in a central or neutral po sition. The compression of the springs may be adjusted from time to time as they tend to become weaker', by simply adjusting the nuts 66 on the bolts 63. After one of the treadle levers has been depressed to operate the machine, and is released, one of the springs will automatically shift the clutching pulley to neutral position and at the same time return the treadle to its raised position.

It is sometimes important to bring the bending head to a standstill soon after either of the treadles has been released, especially when it is desired to make accurate bends. On account of the momentum of the rotating parts. the bending head might be rotated beyond the desired point. To overcome this difficulty. a bra-ke drum 67 is keyed to the shaft 32, and has an annular groove on its periphery to accommodate a brake band or strap 68, one of the ends of which is pivotally connected to a weighted lever 69. The lever'is pivotally mounted on an aXle bolt 70 passing through the two legs 71. and 72 of a U-shaped upright, the leg. 72 being longer than the leg 71 and secured at its upper end to the top beam 18, the lower end of the uprights being fastened to the lower channel beam 18a. An arm 73 is integral with lever 69, and receives a threaded rod 74, which is pivotally connected to the other end of the brake band. A weight 75 is adjustable on 'the lever rod 69 to impart more or less friction as desired. The force of gravity on the right end of the lever (Fig. 1) is communicated to both ends of the brake band. In case the brake should fail, or when an emergency arises, the operator may simply depress the reversing treadle and thus use the clutch as a very effective brake. (Figs. 1 and 8.)

To enable the attendant to determine the exact angle of any bend, a pointer 76 is threaded in the bending head 20, and cooperates with an arcuate calibrated scale 77 mounted on the top plate at one side of the arcuate slot 23, and fastened by rivets or bolts. The operator, by observing the position of the pointer, can determine when to release either of the treadles and may follow the angularity of thel bends being made.` (Figs. 3 and 4.)

Secured to the bed plate 11 at the rear end is a pair of parallel graduated scale bars '78 and 79 arranged on o )osite sides D of a center line passing between the bend# mg lugs 13. (Fig. 9.) Each bar has a longitudinal slot 8O to receive an adjustable stop member 81 secured in position by thumb nuts 82 on bolts 83. The ends of the bars remote from the bed plate are joined together by a link or bridge piece 84, which is adapted to hold them in parallel relation. A stock rest or supporting bar 85 is bolted across the two bars 78 and 79 and is adjustable thereon by the bolts 83. The table top 1l is graduated at 79 (see Fig. 9) to cooperate with the graduations on the scale or gage bars 78 and 7 9, On the opposite end of the bed of the` machine a single centrally arranged graduated longitudinal slotted bar 86. carrying an adjustable stop 87, is removably secured on the top between angle brackets 86a, and said bar is held under the arc scale 77.

To hold a plurality of bars or rods together for simultaneous bending, l prefer to use one or more clips or clamping mem bers 88, each preferably comprising a narrow lJ-shaped clamp slotted as at 89. A

ring receiving eye 90 is stamped in one leg f of the U, and a ring receiving projection or latching ear 91 is stamped out of the other leg. A ring 92 is secured in the eye 90 and carries a strong elastic band or loop 93. Another ring 94 in the free end of the band or loop is adapted to engage in the latching ear 91 to firmly hold the rods in engagement side by side, lduring the bending operations. However, the clips may be dispensed with when only a single rodis bent,

since the operator can easily hold it by hand during the bending. By holding the rods at an angle to the Atable top, bends in different yplanes may be made in the same bars.

I prefer to employ wear plates of proper thickness adapted to fit upon the lugs 13 and snugly embrace the rounded bending edges to prevent undue wear.. In practice, it is desirable to employ wear plates of different thicknesses to partially close the gap between the lugs, to provide for bending rods of different diameters, the space being necessarily wide in order to accommodate the largest rods the machine is capable of bending. When rodsrof small diameter are to be bent, a pair of thick wear plates are used. The platesmay be dispensed with when relatively `large rods are being bent. n

When it is desired to bend. stirrups, I proceed as shown in Fig. 4. The stop 87 on bar gage 86 is set at the desired point, determined by the required length of the legs of the U bends which are bent first. of the treadles, say 58 for example, is depressed to rotate the beveling head 20 to one side, and a single rod or bundle of rods 96 of the samelength, firmly clamped together with one or more clips 88 with their ends even, are inserted between the bending lugs 13 with one end abutting against the stop 87. The treadle 59 is then depressed to cause the bending head to rotate and bend the rods around one of the lugs as a fulcrum (see Fig. 4L), the operator, at the same time, holding the free ends of the rods to prevent movement thereof. As soon as the first right angle bend is completed, the bending head is reversed by depressing the. proper treadle, the rods removed and again inserted in the manner described above to form the other right angle bend, while the bending head is still rotating and thus the second bend may be made without again reversing the machine. After the U bends are completed, the stops 81 are set at a point on the scale or gage bars 78 and 7 9 determined by the desired length of the stirrups. The bending operations are repeated to produce the hook ends as seen in Fig. 9. During these bending operations, the legs of the stirrups are supported. on the cross beam. 85,

011e of the important features of the in vent-ion is the channel bar 8 with its plate iron. reinforcement 9, which is shown in de-l tail "in Fig. 15 of the drawing. As Figs. 1 vand .2 disclose, `these elements extend transversely across the machine and are placed as near as ossible to the bending strain, this being a jacent to the hub 19. A great deal of strain comes on the bending lugs, particularly when a plurality of bars or rods are bent at one time. It is necessary to make some rprovision to distribute this One strain, and the ,channel bar with its reinforcement accomplishes the desired result.

lVhileI have shown and described a preferred embodiment of my invention, it will be understood that various changes involv.

ing omission, alteration, l substitutiony and rearrangement of parts may be made without departing from the scope of my invention which is defined inthe appended claims.

that is claimed is 1. In a bending machine, a table, a stirrup bending abutment on said table, said abutment comprising a prism having one edge rounded, bracing means for the abutment connected to the table, a power operated bending roller cooperating .with said abutment, theroller being movableA in front lof the rounded edge of the abutment and alongside the outer side thereof to bend a rod or bar about the same, and means to control the operation of the bending rollerV at will.

2. In a bending machine, ametal plate, a. pair of spaced lugs rising from the plate, each lug being substantially in the shape of a right triangular prism, the opposing faces of the lugs being parallel and the front edges being rounded, each lug having a bracing web integral with the rear face thereof, and means cooperating with the rounded edges of said lugs to bendrods or bars thereabout.

In a bending machine, a metal plate, a pair of spaced lugs integral with the plate, each lug being substantially in the shape of a right triangular prism, the opposing faces of the lugs being parallel and the front edges being rounded, each lug having a bracing web integral with the plate and with the rear face of the lug, and means cooperating with the rounded edges of said lugs to bend rods thereabout.

4L. In a bending machine, a plate, a substantially prism-shaped bending lug on said plate having one rounded edge, a removable wear plate telescopically mounted upon and engaging at least two edges of said prism-V shaped lug, and lmovable bending means adapted to bend stock about the rrounded edge of said lug and wear plate. i

5. In a bending machine, a bending head, a pair ofspaced bending lugs adjacent said head, each of said lugs being substantially triangular in cross section and having a rounded edge, each lug having a slidably removable'wear plate partially surrounding it and fitting against its rounded edge.

6. In a bending. machine, a metal plate, a pair ofspaced, substantially prism-shaped bending lugs integral with the plate, hardH ened wear plates slidableon said lugs and adapted to partially fill the space therebetween to accommodate rods of dierent diameters, oscillatable bending means adapted to bend rods about one edge of either kof said lugs, and power connections and control mechanism for saidjbending means.

7 In a bending machine, a plate, a pair of spaced vertical prism-shaped bending lugs on` the plate having opposed parallel faces adjacent the space therebetween, one edge of each lug being rounded, wear plates telescopically engaging each of said lugs for partially iilling the space therebetween, and movable bending means adapted to bend rods,'inserted in the space between the lugs, aboutV the rounded edge of either lug at the will of the operator.

8. In a bending machine, a table, a pair of vertical spaced rigid bending lugs, hardened Wear plates adapted to telescope on said lugs to partially close the gap between the lugs and to prevent undue wear, and a power ac tuated oscillatable bending head coacting with either of said lugs to bend stock about one or the other at the will of the operator.

9. In a bending machine, a table, a pair of vertical spaced bending lugs on the table, said lugs being of the shape of a triangular prism. and rounded at one edge, hardened wear plates adapted to telescope on said lugs to partially close the gap between the lugs and to prevent undue wear of said rounded edges, said plates engaging about opposite ends of said lugs, and an oscillatable bending head coacting with either of said lugs depending upon the direction of movement of saidv head.

10. In a bending machine, a frame, a top plate on said frame, a pair of spacedvertical rigid bending lugs on said plate, a vertical oscillatable bending head adjacent said lugs, means for applying power to said head, and means for controlling the direction of movement of said head at will, whereby to bend stock about either of said lugs.

11. In a bending machine, a frame, a top plate thereon, having an arcuate slot, a pair of spaced rigid bending lugs on said top plate, a bending head rotatable about an axis intermediate of the lugs, a roller carried by said head, said head passing through said arcuate slot, and driving connections for rotating said head, whereby to bend rods or bars about either'of said lugs at the will of the operator.

12. In a bending machine, a table, a pair of. spaced bending lugs integral with the table top adapted to accommodate rods therebetween, a bending head pivotally mounted for oscillation in front of said lugs and. adapted to bend stock in either direction about the same, power connections for actuating. said head, and means to control the application of power to said head at the will of the operator.

13. In a bending machine, a main frame, a top plate secured to said frame and having an arcuate slot, a rigid bending lug on said plate, a shaft below the plate, a rotatable bending head adjacent said bending lug passing through said arcuate slot and mounted on said shaft below the plate, a scale on the top plate at one side of said slot, a pointer carried by the bending head to travel over the scale, and power actuated means for driving said shaft.

14. In a bending machine, a plate having an arcuate slot, lugs mounted on said plate in spaced relation adjacent the center of curvature of said slot, a bending head cooperating with said lugs and passing through said slot, a vertically disposed roller carried by said head and having a reduced lower end, and power actuating connections to said head for moving the roller about said lugs in reversed directions.

15. In a bending machine, a frame, a metal top secured to said frame and having an arcuate opening therein, a bending lug integral with the top, a vertical shaft beneath the top and below the bending lug, an upper journal bearing for the shaft cast integral with said top.l a bending head rotatable with said shaft and projecting through the arcuate opening in the top and coacting with the bending lug, and means for coupling said shaft to a source of power to move said bending head.

16. In a bending machine, a main frame, a top plate on said frame, vertical bending` lugs xed to said plate, an oscillatable bending head movable about said lugs, a vertical power driven shaft, said headv being connected to the shaft, and an upper journal bearing beneath the top plate, said upper bearing comprising a boss integral with the plate and having an opening to receive the upper end of the shaft.

y17. In a bending machine, a table having a metal top plate, a pair of vertical spaced rigid lugs on said plate, a vertical shaft under the space between the lugs and having upper and lower journal bearings, a centralized drop integral with the plate and receiving the upper end of the shaft, said upper end being reduced, the outer diameter of the centralized drop being the same as the diameter of the shaft, a vertical bending head adjacent said lugs and having a hub embracing said drop and secured to the shaft, and an oil opening through said plate in the space between the lugs and communicating with the upper bearing.

18. In a bending machine, a frame, a plate on said frame having an oblong thickened portion, a pair of bending lugs on said thickened portion, an arcuate slot in front of the bending lugs, the edge of the slot adjacent the lugs being beveled, a bending head movable in said slot, a shaft, said head having an arm connected to the shaft below said plate, the arm contacting with the underside of thevplate adjacent the beveled edge of the slot and having an arcuate channel open at each end, and means secured in said plate and projecting in said channel Said plate, said head having an arm. con-' nected to the shaft, the arm contacting With the under side of the plate adjacent the beveled edge of the slot and having an arcuate channel open at each end and open at the top, and a T-headed bolt secured in said plate and projecting insaid channel to prevent scale and dirt from accumulatingI in the bearing for said shaft.

20. In a bending machine, a frame, upper longitudinal side beams on said frame, a plate secured to the side beams, bending means on said plate, a transverse beam in contact with and below the side beams and Secured to said plate adjacent the bending means and adapted to prevent buckling of the plate under strains due to bending heavy stock.

2l. In a bending machine, a frame, upper longitudinal side beams on said frame, a plate secured tothe side beams, bending means on said plate, a transverse beam in contact-'With and-below the side beams and secured to said plate adjacent the bending Ineans and adapted to prevent buckling o't the plate under strains due to bending heavy stock, said beam being a channeled beam, and a plate itted in the channel of said beam, and means for securing the plate in position.

22. In avclip for holding bars or rods while being bent, a U-shaped metal strap having a longitudinal slot in each leg, and clamping means passing through said slot and cooperating With said strap to hold a plurality of' rods or bars in stacked relation said clamping means being detachably secured to one side of the strap.

23.v In a clip for rods and the like, a U- shaped strap having its legs slotted for a portion of their length, one leg having an leye, and a latching projection provided on the other leg, a ring hinged in the eye, and an elastic band vcarried by said ring, and a latch ring carried by said band and adapted to removably engage said latching projection.

24. In a bending machine, a plate, lugs on Said plate, an oscillatable bending head coacting with, 'either of said lugs, an arcuate graduated scale bar on said plate, and a pointer secured to said head cooperating with the scale, whereby to determine the angularity of the bends being made.

25, In a bending machine, a table, bending means on said table including a pair of rigid spaced lugs, a vgraduated gage bar secured to the table and projectin therefrom in 'alinement With the space etvveen the lugs, and stop means slidably secured on said gage bar forming an abutment for the ends of the stock being bent and adapted to determine the length of the straight portions thereof. j

26. A bending machine comprising a table, upstanding lugs on said table and in spaced relation, a bending device 'roclrable "f about an axis between said lugs ada ted to engage the rods and form the desire bends, gage bars secured to the table, and an adjustable stock support carried by the gage bars for supporting the stock being bent. j i

2'7". In a bending machine, a table, means Von said table for bending rods onbars, a pair of gage bars secured to the table, a cross beam adjustably secured to said bars, and an adjustable stop on each of said gage bars, said gage bars and beam adapted to support the stock being bent and the sto s adapted to determine the length of rt e stock between bends.

` 28. A bending machine comprising a suitable support, lugs on and rising from the support in spaced relation to each other, a bending device roclable about an axis .intermediate of ythe lugs, a pairof spaced gage bars extending in a. direction away vfrom the bending device, and anv adjustable stock support carried vby the gage bars for supporting the stock during the bending operation. y

L19. A bending machine comprising a suitable-support, lugs on and rising from the support in spaced relation to each other,

a bending device rockable about an axis intermediate of the lugs, a pair of spaced age bars extending in a direction away rom the bending device, and an adjustable stock support carried by the gage barsl for supporting the stock during the bending operation, the machine .also being provided with a gage curved about the axis of move- Vment of the bending device and similarly graduated on opposite sides of the intermediate point of travel ofthe bending device. A

30. In a. bending machine, a trame, closely spaced rigid lugs erected thereon, a bending yhead oscillatable about said lugs adapted to bend rods in either direct-ion about the same, a shaft to carry the bending head, a gearing tor driving the shaft, normally idle driving` means for driving' the gearing, automatic means for maintaining the driving` means in idle position, and`manua] means for connecting the driving means with said shaft, said bending head `being operable to bend stockabout either of said lugs.

31. A bending machine comprising lasuitable frame, an oscillatable bending head, fixed spaced lugs in operati-veA relation to the bending head, gearingfor driving the head, coupling means for connecting thek gearing with a source of power capable of driving the gearing in opposite directions, and means for controlling the coupling means at will.

32. ln a bending machine comprising a table, bending lugs on the table, a bending head mounted on a shaft and oscillatable about said lugs, and power actuated means for driving said head, said means comprising a pair of oppositely rotating movable friction pulleys cooperating: with a friction member, a shaft carrying said pulleys and friction member, a train of reduction gearing between said shaft and the shaft carrying the bending head, and means for selectively engaging either of said pulleys with the friction member to reverse the movement of said bending head.

In a bending machine, a pair of fixed vertical bending lugs, an oscillatable bending head co-acting with either of said lugs to bend rods in either direction about the same, power connections to operate said head, and manually operable means for controlling the power connections whereby to reverse the movement of the head at the will of the operator.

ln a bending machine, a table, .spaced bending lugs on said table, bending means movable about said lugs in either direction ,for bending rods inserted between the lugs about either of them at will, power-actuated means connected to said bending means, and selective means for controlling 'the power transmission at the will ofthe operator.

35. ln a bending machine, a table, bending lugs on the table, an oscillatable bending head adjacent the lugs, a shaft on which said head is secured, a reduction gearing for driving said shaft, a pair of power-driven normally idle pulleys rotatable in opposite directions7 a friction member between the pulleys for driving said gearing, and a pair of foot pedals operatively connected to said pulleys to move them into frictional engagement with the friction member', whereby to control the movement of the bending head at will.

36. ln a bending machine, a frame,closely spaced lugs erected thereon in opposed relation, a bending head movable concentrically about a point intermediate of the lugs, a rockable sh aft to carry the head, gearing for driving the shaft, normally neutralized driving means for the shaft, and manually controllable means for causing the coupling of the shaft to power means at the will of an operator. i

37. A bending machine comprising a frame, a. rotatable bending head, fixed spaced lugs in operative relation to the bending head, gearing for driving the bending head, coupling means for connecting the gearing with a source of power capable of' driving the gearing in opposite directions, mea-ns for centralizing and neutralizing the coupling means to cause the bending means to act in opposite relations to the lugs, and means under the control of and appropriate for causing the bending head to be actuated in one or the other of opposite directions.

38. ln a bending machine, a pair of Xed bending lugs, oscillatable bending means ad- `jacent said lugs, a shaft to which said bend-- ing means is secured, a gearing connected to the shaft, means for connecting and disconnecting the gearing with a source of power whereby to bend rods or bars about either of said lugs at will, and a brake coacting with said power connections for stopping the bending means automatically as soo-n as the gearing is disconnected, irrespective of the direction of rotation thereof.

lin testimony that l claim' the foregoing as my own lhave hereto affixed my signature.

THEGDORE KARDONG.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2449409 *19 Nov 194514 Sep 1948Coleman Pettersen CorpBending machine with pivoted bender carrying a work supporting arm
US2492360 *26 Oct 194527 Dec 1949 Pivoted sweep abm bender with
US2876823 *10 Jun 195310 Mar 1959Bundy Tubing CoBending pad structure and associated apparatus for bending tube
US3452581 *23 Sep 19661 Jul 1969Frederiksen Ove SteenMachine for bending tubes or rods
US4049026 *15 Apr 197620 Sep 1977Remigio Del FabroBending apparatus having a shaped mandrel used in automatic bending machines for metal wire and bar stock
US4350033 *24 Jun 198021 Sep 1982Masamitsu IshiharaMethod and mechanism for constant-measure feed of rod materials
US5497643 *16 Feb 199412 Mar 1996Ars CorporationRemote bending apparatus
US5669261 *22 Sep 199523 Sep 1997Retermia OyApparatus for bending a heat-exchanger tube
US6094960 *20 Apr 19991 Aug 2000Kane; Kevin AlanMetal strip bending device
US738700924 Mar 200617 Jun 2008Kevin KaneAutomated bending machine
US7523633 *27 Oct 200528 Apr 2009Mielke Laurence HWire tray jig and bending method
US20060260377 *24 Mar 200623 Nov 2006Kevin KaneAutomated bending machine
US20070256466 *25 Apr 20078 Nov 2007Antonios AnagnostopoulosMachine and process for production of three-dimensional stirrups
DE895088C *23 Sep 194229 Oct 1953Anton WagenbachFormstueck zum Biegen von Stabeinlagen fuer Stahlbeton
DE1042347B *30 Jul 195430 Oct 1958Giovanni De FrancescoVorrichtung zum Biegen von Metallstaeben od. dgl.
DE1162666B *1 Sep 19606 Feb 1964Peddinghaus Paul Ferd FaBetoneisenbiegemaschine mit einer Drehungen bis 360يز in beiden Drehrichtungen ausfuehrenden Antriebswelle fuer den Biegeteller
EP1852195A224 Apr 20077 Nov 2007Antonios AnagnostopoulosMethod and Machine for Production of Three-Dimensional Stirrups
Classifications
U.S. Classification72/2, 72/388, 72/31.11, 72/217, 72/250
International ClassificationB21D11/00, B21D11/12
Cooperative ClassificationB21D11/12
European ClassificationB21D11/12