US1008404A

US1008404A - Bending-machine.

Info

Publication number: US1008404A
Application number: US63293911A
Authority: US
Inventors: Carl E Anderson
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-06-13
Filing date: 1911-06-13
Publication date: 1911-11-14
Anticipated expiration: 1928-11-14

Description

0. E. ANDERSON.

BENDING MAGHINE.

APPLICATION FILED JUNE 13, 1911.

Patented N0v.14, 1911.

5 SHEETS-SHEET 1.

v MN ma Q E Wu,

- add A HNE GS G. E. ANDERSON.

BENDING- MACHINE.

APPLICATION FILED JUNE 13,1911.

Patented Nov. 14, 1.911.

5 SHEETS-i332! 2.

we! ATTOAVEYS [NYE "TOR M4. M

fiESSES:

G. E. ANDERSON.

BBNDING MACHINE.

APPLIOATION FILED 1111111 13, 1911.

5 BHEETS-BKEET E.

C. E. ANDERSON.

BENDING MAUHINE.

urmcmxon IILIJD mm 13, 1911,

s1n:m' 4.

Patented Nov.

5 SHEETS 5] mac M00 6? W- c. E. ANDERSON.

Patented N0v. 14, 191 1.

5 sums-B11111: r 5.

INVENTUI? 1 -M WM 1 I 4 w 1. I 1 0 N kw 8 W X, was M m I 1 h 0 m W I 1 ATTORM 'YS CARL E. ANDERSON, 01" EAST ORANGE, NEW JERSEY.

BENDING-IACHINE.

Specification of Letters Patent. Applieation filed June 13, 1911. Serial No. 688,989.

Patented Nov. 14, 1 911.

To all whom it may concern:

Be it known that I, CARL E. Ammnson, a citizen of the United States, residing at East Orange, in the count of Essex and 5 State of New Jersey, have invented certain new and useful Improvements in Bending- Machines; and I do hereby declare the fo lowin to be a full, clear, and exact description of the invention, such as will en- 1 able others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to fi res of reference marked thereon, which orm a part of this specification.

This invention relates to a machine which receives the substantially U-shaped strips of soft metal, preferably copper, and bends these strips into armature coils.

Armature coils .are made in different forms, some diverging from their closed end and after being bent outward are brought together again at the other end, and in 0 ers the loo ed end of the U-shaped strip is held, and t e strips are bent apart into parallel -strands, and the termination of these strands are bent still farther apart and then into parallel ends. These diiferent types of coils are used when different windlngs are em loyed in 'the armatures. It is necessary w en making these coils to bend them apart varying distances according to the diameter ofthe armature, and the coils have their side strands arranged atdifierent angles, depending on the number of coils that are placed 1nto an armature. It hasbeencustomary heretofore in making these coils to form a block usually of metal over which the strips are placed and hammered by a hammer or mallet into the required shape. This takes time and is therefore expensive. Under this old systemit has beennecessary when a special type of armature is to be made to make a new block, and the block with its consequent finishing is eaiensive and also retards: the befi'nning of e work. y im roved machine is adjustable so as to .make ifi'erent t "of coils, that is, the coils that diverge from one end toward the other with the parallel strands at the sides as shown in Fi 9 of the drawing, and to also make the arm of armature cell which is closed at its"- ends as shown in Fi 11. u The ach s'als d ig e at e regu-.

lated so as to provide diflerent degreus for the difi'erent coils, that is, the side strands are inclined according to the radius of the armature into which they are to be laced. The machine is also designed to ta different thicknesses of metallic strips which are to be formed'into coils. chine the insertion and removal of the :;tri into the machine is easy and quick and t e coils can be bent in rapid succession, thereby making them cheap.

The invention is illustrated in the a1 :companying drawin Fig. l is a side view of the maahin with part of the mechanism shown ir, section. Fi 2 is an end view with the lever, for holdin the end of the armature removed, an showing'the levers for bending the strip in their closed or normal position. Fig. 3 1s a view similar-toFig. 2 showing the levers drawn apart to bend the utrip. Fig. 4 is a section on line 4-4, in Fig. 1 with the levers embracing the ends 015 the strip forming the coil in their closed. 0- sitions, and Fig. 5 is a similar view with these levers forced apart. Fi 6 is a top view of Fig. 1. Fi 7 is a etail oi one of the chucks for olding the strip and which can be ad'usted to vary the angle of the side strands of the coil. Fig, 8 is a to view of Fig. 7. Fig. 9' is a top view of t e machine similar to Fig. 6, but slowing the strip bent into an armature coil.

s in which In this ma- Fig. 10 is an end view of the top part of a the machine showing the attachment which is inserted in the 'machine when the ends of the strip from which the coil is formed are to be held a ainst separation. Fig. 11 is a top view 0 an armature coil foimed from the strip when its ends are held against separation. a

The machine comprises

legs

10 and, 11. one at each end 'of the M ne, supporting a frame 12 which extends the leg 10 to the leg 11 and rests thereon the two upright ends of the frame 12 being ormed into learings 13 and 1.4, in which bearings is arranged a shaft 15, the frame also being pm.- vided withside stri s 16 as shown inl 4 and 5,. One end 0 the frame 12 isfor med into a bracket 17 provided with par illel guides 18 which are recessed as at 19 to hold an end-block 20 in slidin% relation th erewith. A stop-plate 21 bn gas the ends of 18, and nuts}? and 23 are pl:

on a screw 24, which screw is attached to the end-block 20 and slides freely through a perforation in the stop-plate 21, the nuts acting to limit the movement of the screw 24 and consequently of the end-block 20, a thread on the screw providing for the adjustment of the nuts according to the size and the form of armature coil to be bent, as will be hereinafter described. The end-block 20 is provided with cheek-pieces 25 which are perforated in line to receive a pin 26 having the finger-piece 27 The strip of material which is supplied in a U-shape, with a narrow loo on one end and parallel strands extendmg therefrom, is placed with its 100 ed end 28 between the cheek pieces 25 an then the pin 26 is inserted to hold that end. This insertion is done when the machine is in the position shown in Fi 6 withthe nut 22 back a ainst the stop-p ate 21 and the two stran s of the strip are placed in the blocks which are adapted to separate or bend them apart.

On the shaft 15 are arranged a pair of levers 29 and 30 which are mounted on the shaft so that they swingthereon and to opposite sides 'of the machine, being provided with blocks '31 which are adapted to slide on the rods 32 and bei held against turning by the keys 33 and eld in e agem'ent wlth the rods by means of the b0 ts 34, as will be evident. Each block 31 has a flange 35a ainst which the side strand 36 is placed.

as s own in Fig. 6, the blocks 31 being slid to theirproper positions, and the strands 36 are then placed against the flanges 35 on each side, and the. ller-pieces 37 are placed between the strand 36 and the ridge 38 and fastened onby the screws 39. These fillerpieces are movable on account of the different thicknesses of material used in the strands 36-, and are adjustable according to the thickness of the strands. The levers 29 and 30 are each provided with a pointer 40, these pointers be ng adapted to travel on an index-plate 41 so as to rovide for g 'ng the se aration of the si e strands 36 dflahe coil -w en the levers 29 and 30rare swung apart. I

On-the shaft 15 and adjacent to thelevers.

29 and 36 are the levers 42 and 43. Each of these levers has guides 44 in which are arranged to slide t e sleeves 45, these sleeves being shown in detail in 7. In each sleeve 45.is a nut 46 which is provided with means for its engagement by a tool, preferably in the form of recesses 47 for engage- "ment by a spanner wrench, The nut 46 has a reduced part 48 fitting into the sleeve 45, the nut being perforated and provided with a screw-thread in the perforation so as to receive the screw-threaded stud 49 which is fastened to a block 50, the block 50 providing the supporting means for engaging the end 51 of the strip from which the armature coil is to be made. The referred form of holding the end 51 of t e strip is by securing a leaf 52. at its outside edge so that it swings on the block 50, this being done by the ivotal connection 53. The leaf 52 is 70 provided with an abutment 54 against which slides-a bar 55 with the cam-face 5 6 thereon, the bar being pivoted as at 57' to a handle 58, which handle is shown particularly in Fig. 1 having its end secured as at 59 to the 75' 1e f 52. A bar 60 has a cam-surface 61 w ich is adapted to be engaged b the cam surface 56 when the bar 55 15 pa led downward by means of the handle 58, these cam faces, when engaging each other, forci the bar 60 sidewise to clamp the end 51 o the strip up against the filler-piece 62, which filler-piece is removable and can be of any' thickness according to the thickness of the piece from which the armature coil is made. The filler-piece 62 fits against a flange 63 on the leaf 52, the flange 63, the fillerpiece 62, the bar 60 and the abutment 54 all being perforated to receive a pin 64 with a fingerpiece 65 thereon, the bar 55 bein provided with a slot 66 throughlwhich t e pin 64 passes, theslot permitting the sliding of the bar 55.

To provide for the varying angles at which the armature coils are made and to provide ,f or the adjustment to bring about the proper angle at the end of the coil after it is bent, screws 67 are arranged in the leaf 52 andhave their bottom ends bearing on the block 50 so that any adjustment on the screws will cause the leaf to swing on the fivotal connection 53 and the angle of the eaf can be adjusted so as to twist the end 51 of the strip of material of which the coil is made so that it assumes an angle to the perpendicular, irrespective of the distance the ends 51 are drawn apart. It will be evident that this adjustment as described for the leaf 52 can be applied to the blocks mounted on the rods 32 of the levers 29 and 30. -Each of the levers 29 and 30 has a connectin -rod.68 ivotally connected as at 69 to sac of the levers,-and connected as at 70 to the crosshead 71, the crosshead in turn bein mounted on a piston-rod 72 connected with the piston 73 in the cylinder 74. A pipe 75 provided with a valve 76 having a handle 77 thereon is adapted to conduct fluid under pressure when the valve 76 is opened so that the fluid under pressure 129 passes into the cylinder 74 and forces the piston 73down, and this carries the crossead 71 with it and consequentl the connecting-rod The movement ownward, caused by the admission of fluid under pressure to thecylinder, is limited by the enga ment of thenoses 7 8 on the connectingr 68 with the adjustable stops 79, which adjustable stops are preferably in the form of screws mounted in the side strips 16.

S rings 80 are connected with the crosshea 71 and also with the frame of the machine to return the levers, the connecting-rods and the piston to their normal positions when the fluid under pressure is shut off and the cylinder is vented, as will be hereinafter described. A cylinder 81 with a piston 82 is connected by means of the duct 83 to the cylinder 74 so that the piston 82 goes down at the same time the piston 73 goes down, the piston 82 carrying with it its piston rod 84, the crosshead 85 and the connecting-rods 86, (see Figs. 4 and 5). The connecting-rods 86 are secured to the levers 42 and 43 by the pivotal connections 87 and have the noses 88 to enga e the adjustable stops 89 which are pre erably in the shape of screws fastened to .the side strips 16 and adjustable so as to regulate the amount of movement of thelevers 42 and 43. Y Struts 90 are mounted on the shaft and bear on the tops of the

cylinders

74 and 81 and thus equalize the pressure and transmit the ressure so that the shaft 15 is not subject to undue strain, neither is the head of either of the cylinders, as the upward pressure from the head of each cylinder is communicated to its strut 90, and this transmits an upward pressure against the shaft 15 to counteract the downward pressure caused by the pull on the

levers

29, 30, 42 and 43 to swing them apart. When the fluid under ressure is shut off by the valve 7 6f the cylinder can. be vented by the valve 91 o erated by the handle 92, and the fluid in

die cylinders

74 and 81 is forced out by the pistons through the pipe 1 75, the valve 91 and the outlet pipe 92.

(Fig.6). v

93 is the su ply ipe which provides for the supply 0 fluid under pressure to the machine.

The interior construction of the valves is not shown because they are of the coinmon form as used. under conditions as above described.

Each block 50 is provided with a screw 94, each screw being adapted to ass freely through a perforation in the. on .-plates 95 secured to the ends of the levers 42 and 43. Stop-nuts 96 providin means for limiting the movement of the locks are placed on the screw 94, the nuts 96 limitin the outward movement of the blocks an the nuts 97 limiting the inward movement of the blocks when they slide on their levers. Suitable tables 98 and 99 can be conveniently placed on the machine for holdin the partly prepared and the finished pro nets of the machine. a

The operation of the machine for bending armature coils that are divergent at one end and closed, at the other end is as follows: The armature coil whichcomes flat and U shaped, the two branches ofthe u being 'viously slid forward in the This movement of the en ,mitted by the sliding of the blocks 50 W5 th their leaves 52, this sliding being limited by the nuts 97 on the screws 94 engaging the separated by a very slight opening and he ving a 100 on one end, is placed with its loop 28 held by the pin 26 etween the chee kpieces 25 of the endblock 20, the end-bio ck 20 being slid. backas shown in Fig. 6, and

the two strands of the-strip are separated and placed betwecntthe filler-pieces 37 a1 1d the flanges 35 on each of the blocks 31, one i being raised slightly higher than the other placed because when the armature coils are inv an armature they must nest, that is, one strand of one goes over the adjacent strand of the other, and the coils for this reason 10 not have their opposite sides alined circumferentially. Each of the screws 39 is screwed down to hold the strip securely, and each of the blocks is fastened by means of its bolt or screw 34 at the proper place on the rod 32 on each of the levers 29 and H0, and then the ends 51 of the strip are plac ed securely in each of the leaves 52. By first pushing in the handle 58, which releases the two cam-surfaces 56 and 61 of the bars 55 and 60, this being shown in Fig. 8, each of the leaves 52 and its block 50 has been preides 44 as shown in Fig. 6 and then the andle 58 on each of the leaves is pulled out to securely clamp the end 51 tightly in place. The strip is then in the pos1tion shown in Fig. 6. The operator then opens thevalve 76 by means of the lever 77 and fluid under prossnre is admitted through the passage 7 5 into the c linders 74 and 81, and this causes the cross ends 71 and 85 to be forced downward connecting-rods 86 have drawn back the levers 42 and 43 from the positions shown in Fig. 4 to the positions shown in- Fig. 5 and as also illustrated in Fi 9. The ends 51 of the strip of material om which the armature coil is being made are bent outward the required distance and also at-ihe required ang1e,.being connected to the side strands 99 by the obli ue strands 1'11.

end=plates .95. This completes the opeirai' tion of bending the armature coil, and; by throwing forward the two levers 58, oneon each leaf 52, and pullingeout the pin 26 by its finger-piece 27, the nt coil can be 1removed from the machine while it is-in the position-shown in Fig. 9. The vent valve 91 is then opened, the fluid under pressure has been IMP- is permitted to pass from the

cylinders

74 and 81, the springs and 102 return the levers to their normal positions shown in Fig. 2 and Fig. 4, and the machine is ready for receiving another strip of material. It will be noted that when the filler-pieces 37 strip they need not be changed when each strip is inserted, since the strip can be easily slipped down behind each filler-piece.

When it is desired to bend an armature coil as shown in Fig. 11 I first lock the levers 42 and 43 against any movement by reason of the standards 103 and the stoppieces 104 being placed under each nose .88 of the connecting-rods 86, thereby holding these levers against movement. I then-replace each of the sleeves 45 by a plate .105,

these plates supporting, by means of the

arms

106 and 107, the block 108, which block receives a nut 109 similar to the nut 46 shown in Fig. 7, providing for the vertical adjustment of the block 110 which is provided with pins 111 and 112 which are employed to hold the filler-

pieces

113 and 114 to bind the two ends 51 one above the other,'

and then when the machine is operated by the introduction of fluid under pressure the plates 105 can move inward and the block 20 can move inward, and the center of the coil being spread apart, it is shaped as shown in Fig. 11 with the side strands 99* and the divergent strands 100 being bent as previously illustrated, but the oblique strands 101 being formed to converge wlth' the ends 51 together as shown in Fig. 11,

apart as shownin Fig. 9.

The index-plate 41 and also the indexplate 115 (see Fig. 10) are used to indicate the throw of the levers and permit their beingstopped at the proper point by the adjustable steps 79 and 89. These-indexplates can have their top surfaces provided with the distance between the strands indicated, and the front of the plates can be indexed by degrees. i

It will be evident from this description that the strips can be bent into coils quickly and cheaply and the angle of the side strands and the ends 51 can be regulated by means of the screws 67 tilting the leaves 52 to the required angle. In this way it is not necessary to always have each of the side strands 99', when bent apart, radial to the shaft 15, but by means of this adjustment they can be madeto assume an angle tangential to the shaft 15, and the coils can be bent to fit difl'erent diameters of armature and also to have different spread so as to provide for different numbers of coils for armatures. Having thus I claim is 1. A bending machine comprising movdescribed my invention, what the two strands of the strip intermediate 0 iits ends, and means for moving the last-men- .-tioned blocks away from each other to separate the strands intermediate of their ends.

have been once adjusted for a certain size 2. A bending machine comprising movstrip of material,

the last mentioned blocks away from each other to separate'lthef strands and cause the strands to move the first-mentioned blocks toward each other. i v

3. A bending machine comprising end blocks movable toward and from each other, said blocks grasping a U-shaped strip at its loop and at its free ends, levers swinging transversely bet-ween the end-blocks, means .on the levers for holding the strands between the end-blocks, and means for saving .ing the levers apart.

4. A bending machine comprising end- .blocks movable towardand from eachother, fsaid blocks grasping a U-shaped strip at its 1 loop and at its free ends, means for limiting the movement of the blocks toward and from ,each other, levers swinging transversely between the end-blocks, means on the levers vfor holding the strands between the endblocks, means for regulating the swing of the levers, and means for swinging the levers apart.

instead of diverging to throw the ends 51 .loop and at its free-ends when moved to their limit ofmovement away fro-meach other,

'levers swinging transversely between the end-blocks, means on the levers for holding the strands between the end-blocks, adjusting means for the holding means for regulating the points at. which the holding means engages the strands, and means for swinging the levers apart.

6. A bending machine comprising endblocks movable toward and from each other, said blocks grasping a U-shaped strip at; its loop and at its free ends when moved to their limit of movement away from each other,

levers swinging transversely between the end-blocks, means onthe levers for holding the strands between the end-blocks, adjusting means for the holding means for regulating the points at which the holding means engages the strands, means for limitingthe swmg of the levers away from each other, and means for swinging the levers a art, the transverse movement of the strands om each other caused by the swinging of the levers acting through the strands to pull the end-blocks toward each other.

7. A bending machine comprising endblocks movable toward and from each other, said blocks grasping a U-shaped strip at its loop and at its free ends, the blocks which grasp the strip at its free ends being also movable transversely, means for moving the last mentioned end blocks transversely,

vers supporting the last-mentioned blocks for swingin them apart, means for limiting the swing o the levers, a second set of levers, blocks on the second set of. levers for holding the strands of the strip between the loop and its ends, means for swingin the second set of levers apart, means for imiting the movement of the second set of levers, and means for returning the levers'to their normal position when the lever-operating mechanisms are inoperative.

9. A bending machine comprising a frame, a block mounted to slide in one end of the frame, means on the block for grasping the loop of the U -shaped strip, a pair of sliding blocks mounted on the end of the machine opposite the first-mentioned block, means on the last-mentioned pair of blocks for grasping the free ends of the strip, a shaft mounted in the frame, levers pivoted on'the shaft and arranged to swing apart, blocks on the levers for holding the strands between the loop and the free ends, means for adjustably securing the blocks on the levers, and means for swinging the levers apart to separate the stran s transversely to cause the end-blocks at the opposite ends of the machine to move toward each other.

' 10. A bending machine comprising a frame, a block shdably mounted in one end of the frame,-means on the block for receiving the loop of a U-shaped strip, blocks slid- .ab y mounted in the end of. the machine opposite the first-mentioned block, said lastmentioned blocks having means for grasping the'free ends of the strip, a shaft, a cylinder mounted beneath the shaft, a piston in the cylinder, in piston-rod on the iston, levers arranged to swing on the sha adapted to be moved toward and from each other, means on the levers for holding the strands between the free ends and the loop, connecting-rods secured to the levers, an operative connection between the connectin -rods and the piston-rod of the cylinder, an means for admitting fluid under pressure to the cylinder to force the levers apart.

11. A bending machine comprising a frame,

a block slidably nihunted in one end of the frame, means on the block for receivin t'. is

loop of a U-shaped strip, blocks' sli ably mounted in the end of the machine opposite the first-mentioned block, said last-mentionedblocks having means for grasping t? 1e free ends of the strip, a shaft, a cyllnder mounted beneath the shaft, a piston in tie cylinder, a piston-rod on the. iston, levers arranged to swing on the sha t adapted to be moved toward and from each 0th '1', means on the levers for holding the strands between the free ends and the loop, connecting-rods secured to the levers, an operative connection between the connecting-rods and the piston-rod of the cylinder, means for almitting fluid under pressure to the cylinder to force the levers apart, means forventi1 1g the cylinder, and means for returning tv 1e levers and their operating mechanism to normal position when the cylinder is vented.

12. Abendin machine comprisinga franc, an end-block slidably mounted in one end ofthe frame, means in the end-block for gras ping the loop of the U-shaped strip, apair of blocks mounted to slide in the end of the fran is opposite the first-mentioned block, means on the pair of blocks for grasping the free ends of the strip, means for limiting thesliding movement of the blocks at opposite ends of the machine toward each other, means for swinging the pair of blocks which grasp the ends of the strip from each other, means for limiting the swinging of the blocks, a pair of levers adapted to swing apart, blocks on the levers, means for adjustably securing I the blocks on the levers so as to vary the distance between the blocks and the same means for swinging the pair of blocks which grasp the ends of the strip from each othe r, means for limiting the swinging of the blocks, a pair of levers adapted to swing apart, blocks on the levers, means for 'adjustablysecurin the blocks on the levers :so as to vary the istance between the blocks and the same lever, means for swinging the levers a art, means for limiting the mov e-.

ment 0 the levers away from each other, and means for returning the levers to their normal position when the swinging means of the levers is inoperative.

14. A bending machine comprising a fram e, a block sliding in one end of the frame, adjustable means for limiting the sliding pressure is s movement of the block, levers mounted to swing in the end of the machine op osed to the block, a block on each lever, amiiustable means for limiting the movement of each block on its lever toward and from thefirstmentioned block, means for swinging the levers apart, a second set of levers, means for swinging the second set of levers apart, and means for returnin all the-levers to their normal position when the lever-operating mechanisms are inoperative.

15. A bending machine comprising a frame, a block slidably mounted in one end of the frame, means in the blockfor securing a stri a shaft in the frame, levers on the 'sha a block sliding on each lever, means for limitin the movement of the first-mentioned bloc means for limiting the movement of the blocks on the levers, the blocks being adapted to be moved toward and from each other, a second set oflevers, blocks on the second set of levers, cylinders, operative connections between the cylinders and the levers for forcing them-apart, means for admitting fluid under pressure to the cylinders, and means for returnin the levers to their normal ositions when t e fluid under l fut off and the cylinders are vented.

16. A bending machine comprising a frame,

a block slidably mounted in-one end of the frame, means in the block for securing a stri a shaft in the frame, levers on the 'sha t, a block sliding on each lever, means the movement of the first-menfor limitin tioned bloc means for limiting the movement of the blocks on the levers, the blocks moving in a direction toward and from each other, a second set of levers, blocks on the second set of levers, cylinders, crossheads on the cylinders, means for controlling the adi mission of fluid under pressure to and. from the cylinders, connecting-rods secured to the 'crossheads andv to the levers to swing the levers apart when fluid is admitted to the cylinders, and springs for forcing all the levers to their closed positions when the cylinders are inoperative.

17. A bending machine comprising a frame, a block slidably mounted in one end of the frame, means in the block for securing a stri a shaft in the frame, levers on'the 'sha a block sliding on each lever, means for limiti the movement of the first-mentioned bloc means for limiting the move- ..c eads and to the evers to swing the levers apart when fluid is admitted to the cylinders, springs for forcing all the levers .on they shaft, blocks adjustably secure to their closed positions when the cylinders are inoperative, and adjusts ble means on the frame for regulating and limiting the outadapted to swing apart, means on the levers for engaging the sides of a U-shaped strand,

means for swinging the levers apart, and yielding means for holding theloop and the free ends of the U-shaped strand to permit the spreading. of the intermediate portion of thestrip by the levers.

19. A bendlng machine comprising a frame, a shaft in .the frame, levers swin ing on the levers for engaging the strands of a U- shaped strip, means, for swinging the levers apart, means for normally returning the levers to their closed position, means for limit ing the outward swin .of the levers, and yielding means for hot ing the loop and the free ends of the U-shaped strand.

20. A bending machine comprising a frame, a shaft'on the frame, leversarranged to swing on the shaft, blocks on the levers, means for adjustin the blocks on the levers longitudinal with t e shaft, a cylinder under the levers, connecting-rods secured to the levers and connected with the cylinder to be operated thereb when fluid under pressure is admitted to tile cylinder, means for limiting the-movement of the connecting-rods, means for returning thelevers to their normal position when the cylinder is vented, and yielding means for holding the loop and the free ends of. a U-shaped strip en- 'gaged bythe blocks on the levers.

- 21. A bending machine comprising a frame, a shaft on the frame, levers arranged to swin on the shaft, blocks on the levers, means or adjustin the blocks on the levers longitudinal with te shaft, a cylinder under the levers, connecting-rods secured to the levers and connected with the cylinder to be operated thereb when fluid under pressure is admitted tot e cylinder, means for limiting the movement of the connectin -rods, means for returning the levers to their normal position when the cylinder is vented, blocks sliding in the machine, stop-plates on the frame, screw-threaded rods on the blocks, nuts on the rods for engaging the stop-plate therebv limiting the movement of the side strands, means for adjusting the the strip, means ends of a swinging leaves to regulate the angle of the side strands, and means for forcing the levers apart. 1

23. A bending machine comprising a frame, a shaft in the frame, levers swinging on the shaft, blocks on the levers for engaging the sidestrands of a U-shaped strip, a movable block for engaging the loop of the strip, means for forcing the levers apart, swinging leaves on the blocks for engaging the side strands, means for adjusting the swinging leaves to regulate the angle of the side strands, means apart, and means for limiting the outward movement of the levers.

24. A bending machine comprising a frame, a shaft in the frame, a blockon one end of the frame and sliding therein, means on the block for grasping the loop of a U- shaped stri levers on the shaft, means on the-levers or gras ing the side strands of the strip, means or tilting the grasping means, and means for swinging the levers apart.

, 25. A bending machine comprising a frame, a shaft in the frame, a block on one end of the frame and sliding therein, meanson the block for grasping the loop of a U- shaped stri levers on the shaft, means on the levers or gras ing the side strands of or tilting the grasping means, means for swinging the levers apart,

means for limiting the outward movement of the levers, and means for returning the levers to their closed position when the swinging means is inoperative.

26. A bending machine compising a frame, a shaft in the frame, bloc on the o posite ends of the machine,-means on the b ocks for rasping the loo and the free I -shaped strip, evers for so porting the blocks on the free ends of t e strip, a second set of levers, adjustable blocks on the second set of levers for grasping the side strands of the strip, side strips on the a machine, adjustable stops onthe side strips of the'machine, cylinders mounted beneath the shaft, pistons and piston-rods in the cylinders, crossheads on the piston-rods, con,- ne'ctin -rods secured to the crossheads and to the evers, means for admitting fluid under pressure to the cylinders, means for venting the cylinders, and means on the connecting-rods for engaging the adjustable stops for limiting the swing of the levers.

- 27. A bending machine compising. a

frame, a shaft in the frame, bloc on the o posite ends of the machine, means on the 'b ocks for grasping the 100 and the free ends of a -shaped strip, evers for supporting the blocks on the free ends of t e i a strip, a second set of'levers, adjustable blocks on the second set of levers for grasping the side strands of the strip, side strips on the machine, adjustable stops on the slde strips or forcing the levers of the machine, cylinders mounted beneath the shaft, pistons and piston-rods in the cylinders, crossheads on the piston-rods, connecting-rods secured to the crossheads and a to the levers, means for admitting fluid under pressure to the cylinders, means for enting the cylinders, means onthe connecting-l,

rods for engaging the adjustable stops for, limiting the swin of the levers, and spin connected to the rame and to the crossh ea for returning the levers to their normal positions when the cylinders are vented.

'28. A bending machine' comprising a frame, a shaft in the frame, blockson the oppositeends of the machine, means on the blocks for grasping the loop and the free ends of a U-shaped strip, levers for sup] vorting the blocks on the free ends of the strip, a second set of levers, adjustable blocks on the second set of levers for grasping the side strands of the strip, side strips or the machine, adjustable stops on the side strips of the machine, cylinders mounted beneath the shaft, pistons and piston-rods in the cylinders, crossheads on the piston-:rods, connecting-rods secured to the crossh eads and to the levers, means for admitting fluid under pressure to the cylinders, means for venting the cylinders, means on the connecting-rods for engaging the adjustable stops for limiting the swing of the levers, springs connectedto the frame and to the crossheads for returning the levers to their normal positions when the cylinders are vented,

and struts bearing on the ends of the cylinders and on the shaft.

29. A bending machine comprising a frame, a block sliding in one end oi the frame, cheek-pieces on the block having 'alined perforations, a detachable pin in the perforations, the cheek-pieces and the pin cooperating to secure the loop of-a U-sha ed strip, sliding blocks mounted on the en of the machine opposite the first-mentioned block, manually operated means on the lastmentioned blocks for gra ing the free ends of the strip, screw-threa ed bolts projecting from the blocks, nuts onthe bolts, atop plates adapted to be engaged by the nuts or limiting the movement of the blocks a shaft in the machine extending substantially arallel with the strip when it is in the ton-rods of the cylinders, connecting-rods 1 p evers,

secured tothe'crossheads and to the inders, springs for returning the levers to means for controlling the admission and outletof fluid under pressure to the cyl-' their normal posit-ion when the cylinders are vented, and adjustable means on the .frame for engaging the levers for limiting .their outward movement.

30. A bending machine comprising a frame, a block sliding in one end of the frame, cheek-pieces on the block having alined perforations, a detachable pin in the perforations, the cheek-pieces and the pin cooperating to secure the loop of a U-shaped strip, sliding blocks mounted on the end of the machine opposite the first-mentioned block, manually operated means on the last- 'mentioned blocksfor grasping-the free ends of the strip, screw-threaded bolts projecting from the blocks, nuts on the bolts, stopplates adapted to be engaged by the nuts for limiting the movement of the blocks, a shaft in the machine extending substantially parallel with the strip when it is I in. the

blocks, a set of levers mounted on the shaft the erossheads and to the levers, means for controlling the admission and outlet of fluid under pressure to the cylinders, springs for returning the levers to their normal osition when the cylinders are vented, ad ustable means on the frame for engaging the levers for limiting their outward movement, and means onthe blocks on the levers for tilting the strands.

31. A bending machine comprising a frame, blocks arranged to slide on the frame, means for moving the blocks apart, a sliding bar on each block, a handle for operating the slidin bar, a fixed bar on each block, cam-sur aces on the opposed bars adapted to engage each other when the sliding bar is operated, a filleriece adjustably secured on the block, the xed .bar

and the filler-piece being adapted to grasp the free ends of a U-shaped strip, yielding means for holding the loop of the U-shaped strip, blocks for engaging the strands of the strip between its free ends and its loop, and means for operating the last-mentioned blocks to pull the strands apart intermediate of the free ends and the loop of the strip.

In testimony, that I claim the foregoing,

I have hereunto set my hand this 10th day of June 1911.

GARL E. ANDERSON.

' Witnesses:

WM. H. CAMFIELD, M. A. JoHNsoN.