US1465733A - Bending machine - Google Patents

Description

J. H. HQLMGREEN BENDING MACHINE Filed Aug. 4, 1919 4 Sheets-Sheet 1 ATTORNEYS.

NVENTOR. Holmg reen Aug. 21, 1923. 1,465.733

J. H. HOLMGREEN BENDING MACHINE Filed Aug. 4, 1919 4 Sheets-Sheet 2 R I I INVENTOR.

Julius Hfiolmgreen ATTORNEY],

J. H. HOLMGREEN BENDING MACHINE Filed Aug 4 Aug. 21, 1923.

NH WEI Til Q TE! INVENTOR 'JuliusHHolmqreen ATTORNEYJ,

.Aug.21,1923. 1,465,733

J. H. HOLMGREEN BENDING MACHINE Filed Au 4, 1919 4 sheets-sheaf 4 INVENTOR.

Julius HHolmgreen B Y Wfizm M ATTORNEYS,

Patented Aug. 21, 1923.]

JULIUS H. HQLMGREE 0e SAN Anromo, Texas.

BEND'ING MACHINE.

Application filed August 4, .1919. Serial No. 315,154.

bend rods. bars. wires and similar materials into a variety of forms suitable for structural purposes, such as reinforcements for concrete structures Machines of this kind previously used were hand operatedand the degree of bending was usually gagedonly bftheeye with perhaps the aid ofa chalk mark on the machine. As a resultthe different pieces, supposedly of the same were not bent tothe same angle thus intro ducing inaccuracies in the set-up reinforcing structure. Only a limited number of bends could be made. the accuracyof which largely depended on theskill of the operator in stopping the machine when the bar wjas bent.

around to a chalk mark on the work table. By this invent-ionl obviate all the disadvantages of prior machines and it is a-u'iong the objects of my invention to produce a machine which is semi-automatic in;its'op eration, bends pieces to accurate shapes. is comparatively simple, easily operated and very rapid in bending various materials.

In carrying the objects of into effect I provide an index means or stop memberpreferably on the shaft of the machine and in the specific embodiment described, in the form of a disk having holes therein which I call an index plate. By means of this member I am enabled to stop the machine after a predetermined angle has been formed on the material being bent. I am able to bend not only sharp angles but Us, Vs and Ss, closed and open loops, com

binations of these, reverse curves and the various other shapes into whlch rods, bars, etc.. are capable of being bent.

Specifically, my machine comprises a' frame and a shaft preferably vertically mounted therein, 'a turn table fixed to the upper end of the shaft and meansfor hold ing and bending the material. Any suitable driving means may be employed but pref erably I use a worm wheel and worm, my index plate being preferably attached to the my invention lower end'of the shaft below the worm wheel.

Referring to the accompanying drawings forming a part thereof, which is illustrated a specific embodiment of my invenacters denote similar parts,

"Figure 1., illustrates a fron machine,

Figure 2, a plan view being omitted, I v p Eigure 3', a vertical section, being in elevation and some omitted,

thereof, some parts Figure 4, a section on line 4" i of Fig ;ure'3, r V 1 F gures 5, 6 and? showmodifications of the bending pin, H

Figure 8, a modified form 10f indezi plate," Figure 9, differentindex nieans, and Figures 10, 11, 12 and 13 various bends which are made by my machine. I

The machine A comprises a frame work consisting of upper and lower sections 1;

at line 3*by bolts. The machine rests on. a

pulleys (or gears) lland having its ends journa'l fed to the'base l at l2. f Clutches 13 and shift bars 14: having 001- lars, 15 engaging the clutches are provided.-

some 'partsso tion, and in which similar referenceobart view my 7.

and 2, respectively, preferably of tlie same' f'shape in orderv that the same 'mold may be 8" used in casting them, which are connected base 4 andicarries at its upper end a work table 5. A shaft 6 preferably verticalis A shift, bar 16 is fixed near the endsl'T of bars 14 so that when one clutch is thrown in the other is thrown out. A shifting bar '19 V is slidab'ly attached tot-he frame 4 by bars 20 and has. a pivot 21 thereon to'which is attached bar 22 journaled in the frame of the machine at 23 and pivotally attached to bar 16 at 24 inorder that a shifting of bar 19 may cause a corresponding shifting of'bar 16 and the clutches. 1

Fixed'to: the shaft and p'referably to the lower end thereof is an index plate 25' whose hub 26 engages the shaftfi, and having-in its peripheral portion 27 a seriesof holes 28 'which' are adapted to engage 'stop pins 2 9 V edjnstment purposes.

normally holds the pedal or in tinted 56 and 57.

formed on bar 19 and some of these pins have retracting springs 32 thereon 'to normally hold the end 31 so as to avoid contact with the stop 33. Pivot-2d to the frame at 36 is a lever the end 3? of which is :ulapted to be pressed down by the foot, and retracting spring retracted position. A plate 39 ha ing upwardly curred ends 40 is atlaehed 'io an intermediate portion and is adapted to engage one of the retracted pins to press the shine downwardly To the upperend o'f snalt 6 i's hxed a torn table j. which may extend to the surface of the Work table '5, but pre'l'erzil'ily hes bolted to it u plat-e ill by means or" countersunk bolts all, Upon the turntable is fixed a cramping member 48 held in place by bolt Bending: pin '50 which may be any. suitable shape is inserted into a corresponding hole in the renter 0'? plate and car- 7 ries a keyivay and key 51 adapted to lie 5.

pin against rotatory motion relative to rtion of the same SUZG and shape as 52 in order to provide a meansior allowing' 3 m '0 to sl p down into its hole after which disk-53 is rotateil so as to lock the pin against yetieal moyernent f Various shapes and sit res of bending pins may be used such as are illus Wheh it is desired to form bends of large radius collars 58 of onions sizes may he slipped over pin to provide a bearing surfacelor the n aterial to be bentrto the, desired curvature.

On the Work tableare formed eseries of grooves 60 fire'lerably T haped which are adapted to engage bolts for h lding); an adjustable stop member to the vork table, The stop member consists preferably of a memoer 61 which may be aiiljustably secured in said slots and carries a movable frame 62 'heldin alignment and in position by bolts 33 and (34;, lhe bolt G l ope at n; inn slot 65 "for On the end 66 oi the stop iournaled a roller 6? preferably in a hole drilled in. the end of: the member 66 into which the roller is inserted. Plates 68 prevent roller 67 from moving vertically upward or downward. V The operation of the machine is as follows:

' The cramping member 48,. bencling pin 50 and stop member 61 are fixed in the positions shownso that rod or other material to be bent may be placed between them. The index plate 25 carries apermanent stop B, and, for example, another stop 29 at an angle (r5135 degrees'to thefirststop. -The lever-1T ispushed over, let us sayto the left, as shown by the arrow in order to The stop member 29 which moves with the index plate 25 will engage oro ieetion 3 on Meanwhile the cramping; member 48 hasengagerl the end of the roll to be bent and has bent it around pm 5 h the free end or:

the rod being in engagement wii'ih'roller 6 V which holds in aliginnent. When erznnpingnimnber l8 engages the end (it the rod ljieingf bent it causes a creeping motion of the rod so that the rod moves slowly for- Ward so as to allow "of lree bending; without any binding or undue strain on the machine. 7 V V preferably provide a series of gage members 7(h 71; etc, adjnstuhly mounted noon ubar "Z2 fixed to the frame of the machine. #Vhen rodto be bent is placed on lhe table, gage member as 70, which is normally in a raised positiomis thrown over about its pin 73 to allow the gage to lie in a horizontal. position and engage theend of the rod being bent,

After the first bend of 135 degrees, for exznnple hasbeen madeand it is desired to make another bend on the same rod, let us say at an angle oi 90 degrees a retracting p n 3 set at an angle ot 90 degrees to the permanent stop member is placed the;

index platel- "he' first bend hm 11153 been ioo made; the rod removed a d the machine l inanentstop member B ring-t res pro} 233. stopping. the machine as; the original point. V

The rod being bent is-agaln inserted between the stop members with its end abutting the, next nag'o member U, which has been thrown down into :1 horizontal nositionf The member l? is again i'hrowh to the le'i't to start the i'i'inchi'e and the pedal 37 depressed so that it engagest'he head of the retracting: pin El i pressin g'it down \\'ar( y as it approaches firoieetion 33 cansing it to shift bar l5) again rut-ting out the driving means and strr riping the machine when the desired Ru le of 90 degrees has been formed. 3 r 7 It will beseen that by this arrangement I may 'iornitrro bends oi different angles on a bar Without resettingthe machine. I can form. more than two bends of dilferent character Without resetting my machine by providing a plurality of retractingpins of dif .le'rent lengths operated byeither a plurality 5 spring retracted pedals or by a single initl the g' eiy Jill ' and r tightening the screw.

pedal which is adapted to assume a plurality of vertical positions. I can also form bends at varying distances from the ends of a rod as in Figures 10, 11 and 13 by using two or more stops 7O, 71, as above explained.

. Although I have above described and prefer to use an index means comprising a circular plate having holes in its periphery, other forms may be used as shown in Figures S and 9. To the vertical sha't't isfixed a plate (Fig. 8) having aligned grooves "7 in its upperand lower surfaces respectively. A holding plate T8 having a projection T9 corresponding to groove 6 is placed on the plate and a complementary plate having a projection Sl-corresponding to T7 fits into the lower groove and into plateTS. ,3. fixed, adjusted position. A stop pin, which may be of the retracting type is inserted into the end or plate 78. lVhen it is desired to adjustthe angle of bend, screw 82 is loosened, plates 78 and 80 are shifted to the desired position. and clamped in place-by The form shown in Figure 9 comprises a collar 85 adapted to be adjustably fixed .to the shaft by set screw 86. An arm 81' having a strengthening rib 88 extends radially, "the end of the arm serving as a stop pin to en gage projection on the shifting bar. lVhen a plurality of stops are wanted, additional collars having radial arms are fixed to the shaft.

in Figures 10, 11, 12and 13 I have illustrated a few of thecommon forms into which rods may be bent by .my machine it being understood that mv machine is capable of bending almost any shape including closed circles, angles of various sizes and various radii.

to produce various types of bends.

flaring thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A l iendingmachine comprising awo rk table. a turntable, co-acting means on the work table and turntable adapted to bend material upon rotation thereof, a shaft carrying said turntable, said shaft also carrying an index plate, means for driving said shaft in opposite directions comprising a pair of clutches. a pairot clutch levers, a linlcconnecting said clutch levers and having a pro jection thereon, and means on the index plate adapted to engage said projection and disengage the driving clutch.

2. In bending machines a turn table, a work bending means thereon comprising a central depression, a keyway in the wall sponding in size and shape to its extended member.

screw 82 holds "78 and 80 intherev v Pins 50, 55, 56 and 57 show a few of the shapes which I may use in order f3. In .a bending machine, a turntable, a

stationary table, anabutment carried by the 7 stationary table for engaging objects to be bent' and adjustable either longitudinally ortransverselythereof, a cramping member on the turntable in line with the abutment, and

a-bending pin spaced? from the cramping i. Ina bendingmachine, a turntable, .a

stationary table, an abutment carried by the second table "for enga; ng objects to the bent,

a cramping member on the turntable in line with the abutment, a. bending pin spaced 7 "from the cramping member, and a-gage for rods and the likecomprising a support ex tending from the stationary table substantially in alignment with the abutment and .thejcramping member, and spaced devices thereon againstwhich the workmay rest;

5, In a bending machine, aturntable', a

stationary table, an abutment carried bythe from the jcramp-ing'memb'er, audagage for i'0ll and; the like comprisinga support ex tending from the stationaryqtable substantially in alignment withthe abutment and the 'imping member and devices supportediand adaptedto swing nto and out acting as abutmentsfor theend of'such ob I ject farthest from the operator.

1 6. In a bending machine, a work table, support ng member bodily adjustable in a w direction transversely efitslength grooves on the work table an d having an arm thereon adjustable longitudinally of the supporting 'membensaid arm carrying a loosely. held roller at'its :t'orward end, a turntable. a crampmember and a. bending pin held xon the turn table, the bending pin having a kevway' engaging a lrey on the turn table,'a rotary disk on the turntable having a portion cut' away andbeing adapted to engage a notch in the bendin pin, thus locking it to'the turntable.

t. In a bending machine turh table having spaced devices thereon for engaging an object a) bend the same. a stationary abut 4 meet in alignment with'one o't' said devices at their starting position and a incur ber adapted to ensz'age the end ot a red lying between said devices. andfswingahle into and out of such engaging position.

8. in a bending machine, a turntable, a

stationary table, an abutment carried by the secondtable for engagingobjects to be bent, a cramping member on-theturntable in line with the abutment, a bending pin' spaced from" the cramping member, and 2.

ice

gage for rods and the like comprising a support extending from the stationary table substantially in alignment with the abutment and the cramping member, and spaced members pivoted to said support and adapted selectively to engage the end of the work. 9. In a bending machine, a turn table, a separate bending pin thereon, means inde pendent of the bending pin and rotatably mounted at oneside thereof to lock the samev against longitudinal movement, substantially as set forth.

, 10. In a bending machine, a turn table, a separate bending pin thereon, means indepei'ident of the bending pin and rotatably mounted at one side thereof to lock the same against withdrmval from the table and means to prevent rotation of the pin relative to the table, substantially as set forth.

11. In a bending machine a turn table having means thereon to engage an object to be bent, a shaft carrying the table, a worm wheel on the shaft, a worm and its shaft for driving the table, and means for driving, the table through predetermined angular distances including clutches and levers for controlling them, a cross-bar connected to the levers, a parallel cross-bar connected to the first cross-bar and a. plate rotating" with the turntable and carrying adjustable means to engage the latter crossbar and disengage the clutch. 12. in bending machines a turn-table, a shaft fixed thereto, means for driving said shaft, means for cutting off said driving means and a circular index plate having holes in a face thereof on Sflltl Slittift and means on said plate normally inactive but adapted to be'actnated by the operator while the shaft is moving to stop the rotation of said turn-table and shaft at a predetermined point. V i

13. In a bending machine, a turn-table, a stationary table, co-operating means on the tables to engage objects to be bent, a shaft on which the turn-table is lined, means for drivingthe shaft, and means for stopping the turntable at a predetermined time comprising a plate attached to the shaft and ha-vlnga plurality of apertures, a pin adapted tobe placed in any one of the apertures, means holding said pin normally 1nactive and means co-acting with the pin to stop the machine.

7 14:. In a bending machine, a turn-table', a stationary table, co-operatinp; means on the tables to ene age objects to be bent, a shaft on which the turn-table is fixed, means for driving the shaft, and means for stopping the turntable at a predetermined time comprising a plate attached to the shaft and having' a plurality of apertures, a pin adapted to be placed in any one of the apertures, another pin adapted to be inserted in said apertures and normally held in inactive position, and means coacting with either pin to stop the machine.

15. In a bending machine, a turn-table,

reversible driving means therefor, a plate concentric with the table and carrying a fixed member adapted to engage an element of the driving means to check rotation in one direction uniformly atthe .sanie position of the table, an adjustable stop for checking rotation in the other direction automatically at a predetermined position, a

second adjustable stop normally out of en- "gaging position, and means adapted to move it into engaging position.

16. In a bending machine, a turn-table, a stationary table, co-operating means on the tables to engage objects to be bent, a shaft on which the turn-table is fixed, means for driving the shaft, and means for stopping the turn-table at a predetermined time comprising a plate attached to the shaft and having a plurality of apertures, a. pin adapted to be placed in one of the apertures, an-

other pin adapted to be inserted in said apertures and 'normallyheld in inactive position, a treadle whereby the latter pin may 7 be forced into activo position, and means co-act1ng w1th. either pln to stop the mas l chine.

17. In a bending machine a turntable hav ing means thereon to engage an object tobe bent, a shaft carrying the table, a worm wheel on the shaft, a worm audits shaft for driving the table, and means for driving the table through predetermined angular distances including clutches, a cross-bar connected to the lever, a parallel crossbar. con- 7 this 29th day of July, A. D. nineteen huni I dred and nineteen.

JULIUS H. HOLMGREEN. [13.8.]

'Witnesses: H. C. BIERMAN,

M. SHULER.

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