US2430348A

US2430348A - Bending machine

Info

Publication number: US2430348A
Application number: US577520A
Authority: US
Inventors: Larsen Thorval
Original assignee: PHOENIX Manufacturing Co
Current assignee: PHOENIX Manufacturing Co
Priority date: 1945-02-12
Filing date: 1945-02-12
Publication date: 1947-11-04
Anticipated expiration: 1964-11-04

Description

Nov. 4, Y1947.

Filed Feb. l2, 1945 T. LARSEN BENDING MACHINE v 4 Sheets-Sheet 1 Nov. 4, `1947.

\ T. LARSENv BENDING lMACHINE'.

Filed Feb. 12, 1945 4 sheets-sheet 2 JNVENTOR.

Thon/@L ILL/"5672,

T'. LARsl-:N

BENDING MACHINE Filed Feb. 12, 1945 4 Sheets-Sheet 4 1N VEN TOR.

l Www/@llaman Patented Nov. 4, 1947 BENDING MACHINE Thorval Larsen,

tion of Illinois Joliet, Ill., assignor to Phoenix -Manufacturing Company,

J olet, Ill., a corpora- Application February l2, 1945, Serial No. 5775520 13 Claims.

The invention relates to bending machines and has reference Yin particular to an improved machine for cold bending metal rods such as short lengths of headed rods which are bent to form cold shuts.

As a preliminary operation in the manufacture of said cold shuts themetal rods, approximatehr nve inches in length, are headed at one end and the head is perforated, providing a single opening of a diameter large enough to receive the rod. The machineof the invention has been designed for bending these headed rods into a cold shut which is used industr-ially .as a substitute to replace a broken link. The said articles may also be used as a chain hook and for similar purposes.

A primary object of the invention is to provide an improved machine for cold bending metal rods around a forming die to produce successively two substantially right angled bends in a manner which combines a rolling -and a bending action on the metal rod.

Another and more specific object is to provide a machine having an improved mode of operation for bending headed metal rods to form cold shuts and wherein the bending is performed so as to accurately maintain an aligned relation between the head and the terminal end of the rod.

Another object is to provide an improved machine for bending headed metal rods to form cold shuts and which will perform the several bending operations successively, which will bend a plurality of such rods at one time, and which machine will be relatively easy to operate and economical to manufacture, requiring relatively few parts of simple construction.

With these and various other objects in view the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate anembodiment of the invention and wherein like reference characters designate like parts- Figure 1 is a side elevational View, parts being shown in section, illustrating the improved bending machine of the invention;

Figure 2 is a top plan view of the bending machine as shown in Figure l;

Figure 3 is a front elevational View;

Figure l is an enlarged fragmentary front elevational view showing the forming die in fixed relation on its operating roll'and its position with respect to the grooved idle roller;

Figure 5 is an enlarged fragmentary rear ele- (o1. ssa- 27) vational view showing the Vbending die in xed relationonitsoperating roll and its position with respect to the grooved idle roller;

vliigure 6 is a sectional View illustrating the position `of the various bending elements ofthe Vpresent machine at vthe start of the bending operation;

Figure 7 is a sectional view similar to Figure 6 but showing the various bending elements of the present machine in their position for effecting the rst bending operation;

Figure 8 is a similar sectional view of the bending elements of the present machine illustrating the position of the parts at the completion of the first bending operation and at the lstart of the second bendingoperation;

Figure 9 is a similar sectional view illustrating the position of the bending elements at the completion of the last bending operation;

Figure y10 is an elevational view of a headed rod;

Figure 11 is a perspective view illustrating the manner in which the headed rod is bent to form a cold shut; and

Fig, 12 is also a front elevation showing certain of the parts in different positions from those of Fig. 3.

Referring to the drawings, particularly Figures 1, 2 and 3, the present bending machine is suitably supported by means of a table or the like having a supporting portion It and legs II. The upper surface of the portion il) is preferably fiat throughout its extent, the same having suitably secured thereto by bolts I2 the base plate i3 at the forward end of the table and the base plate I4 at the rear of the tab-le. Spaced side frames I5 and I8 are secured at the respective sides of the base plate I3 by bolts IA'I. A plurality of shafts are journalled by the spaced side frames I5 and `l,-two of said shafts having geared connection with each other, and the third comprising an idle shaft. The geared shafts I8 and 20 are journalled for rotation by the side frames I5 and IG, said shafts being releasably supported on the frame members by the journal bearings 2 i. 1n a similar manner the idle shaft 22 is supported by the side frames, the bearings 23 journalling said shaft and which bearings are releas- `ably secured to the frames respectively.

The shafts I8 and 20 are positioned on the front and rear surfaces of the supporting frames, whereas idle shaft 22 is located on top of said frames approximately on a vertical line midway between said operating shafts.

Shaft I8 is provided with gear 24,

whereas shaft 26 is provided with gear 25, both being suitably keyed to their respective shafts and rotating therewith. The roll 26 is also suitably keyed to shaft 8 and the diameter of said roll is such that the circumference of the roll coincides with the pitch circle of the gear 24. A similar roll 21 is keyed to shaft 26 and the circumference of the same also coincides with the pitch circle of its respective gear 25, it being understood that gears 24 and 25 are equal in size and therefore both rolls rotate in unison and to an equal extent.

The shaft 22 supports an idler roller 28 which is provided with a plurality of grooves 36, the said roller rotating freely since it is not connected with the operating shafts I8 and 20. The function of the grooves 30 wil] be presently described in connection with the first bending operation.

Referring to Figures 4, and 6, it will be observed that the periphery of roll 26 is smooth, whereas, roll 21 is provided with a plurality of grooves 3l which extend around said roll for the entire extent of its uninterrupted surface and which are in alignment with grooves 36 on the idle roller 28. rlhe function of said grooves 3| will be explained in connection with the last bending operation performed by the present apparatus.

The roll 26, which may be termed the first operating roll, provides a carrier for the forming die 32, said forming'die 32 having a base portion 33 by means of which the die is releasably secured to the roll. It will be observed that a notch is formed in the roll, providing an opening for receiving the base portion 33, the said portion being releasably secured by means of screws 34. The first operating roll also functions as a carrier for the headed rods 35 which are positioned in a slot 36 provided by the roll. Said slot is located in advance of forming die 32, considering the direction of rotation of the roll as counterclookwise for effecting a bending operation, The forming die 32 extends longitudinally of roll 26 for the full length thereof and said die is provided with a rounded front edge 31 and with a rounded rear edge 36. The rst bending operation takes place around front edge 31 and the second bending operation is performed around the rear edge 38. It will be observed that the arcuate curvature of edge 31 has a larger radius than that of 38 and accordingly the first bend formed in the headed rod 35 is greater than the second bend formed in said rod.

The second operating roll 21 is cut away in a manner similar to roll 26 and a bending die 46 is xed to said roll 21 in the cut-away portion, being releasably secured by means of screws 4|. The bending die 46 extends longitudinally of its roll 21 for the full length thereof and in order to perform its bending action said die extends outwardly beyond the periphery of its roll, having a projecting pointed end 42.

The end of shaft 2U opposite gear 25, Figure 2, extends some distance beyond side frame I6, said projecting end receiving the lever 43 which is suitably keyed thereto. The link 44 operatively connects the lever 43 with lever 45, lever 45 being suitably keyed to shaft 46 which extends transversely of the base plate |4. Bearings 41 serve to journal shaft 46, said bearings being releasably secured to base plate I4 by bolts 48. Substantially midway of the length of shaft 46 and between bearings 41 the said shaft is provided with an operating lever 50. It will be observed that rocking of this lever will rotate shaft 4,6 and.

through

levers

45 and 43 similar rotary movement will be imparted to shafts 20 and I3 and to the

respective rolls

21 and 26 fixed to said shafts.

Any preferred form of power may be employed for oscillating shaft 46. As illustrated in the present drawings an air cylinder 5| is employed having suitable connections with a source of air under pressure, which, when admitted to the rear end of cylinder 5|, will cause outward movement in a forward direction of piston rod 52, By admitting said air under pressure to the front end of the cylinder the piston rod 52 may be returned to its initial position. The forward end of piston rod 52 is bifurcated for receiving the operating lever 56 which is releasably connected thereto by the pivot pin 53. Bracket 54 projects from the rear end of cylinder 5| and said bracket is likewise bifurcated for receiving the projection 55 of the support 56. A pivot pin '51 releasably and pivotally joins the parts so that bodily movement of cylinder 5| is possible. The right angled bracket 58 forms part of the support 56 and functions to back up said support to absorb the rearward thrust from the cylinder 5|. Bolts 59 suitably secure the right angled bracket 56 to the base plate I4.

A guard identified by numeral 60 has enclosing relation with the gears 24 and 25. The

rolls

26 and 21 as well as the idle roller 28 are covered at least partially by a top cover plate having a front sloping apron 6| and a rear sloping apron 62. The cover plate between said aprons is provided with a fiat supporting area 63 having upstanding side and

rear walls

64 and 65, respectively. The flat supporting area, bounded by the side and rear walls, provides an auxiliary supporting surface for a plurality of headed rods 35 which are thus conveniently positioned in front of the operator for feeding to the machine.

In advance of a bending operation the headed rods from the auxiliary support 63 are placed in the slots 66 formed in apron 6|. The slotted portion of said apron is located directly over the slot 36 when the roll 26 is positioned as shown in Figure 6. The

rolls

26 and 21 assume the positions as shown in Figure 6 at the start of a bending operation. The headed rods 35 are thus simultaneously located in the slot 36, with their headed end in down position, and in one of the slots 66 provided in the apron 6|, which last mentioned slot functions to align the rod with a groove 36 formed in the idle roller 26, which, as previously explained, is in alignment with a groove 3| in the roll 2l'. The apparatus is now ready to perform a bending operation on the headed rods 35 to bend them into the form shown in Figure 11.

By admitting compressed air or other fluid under pressure to the rear end of the cylinder 5| the piston rod 52 will =be moved outwardly in a forward direction, rotating shaft 46, which rotation is transmitted by the connecting links and levers to the operating rolls 26 and 21. Attention is directed to the first operating roll 26 which carries the rods 35 in a fixed relation with respect to the forming die 32. Roll 26 is caused to rotate in a counterclockwise direction, it being understood, of course that roll 21 therefore rotates in a clockwise direction. The initial rotation of roll 26 will bring the ends of the rods 35 which project above the slot 36 into contact with roller 28. Since the function of the slots 66 is to align the rods 35 with the grooves 30 in said .idle roller, the projecting end of each in desired alignment and 4.idle roller and this intertting relation continues `until the rods are brought into association with the grooves 3l provided by the roll 21. The grooves therefore function to maintain the .rods

initial positioning of the rods is maintained until both bending operations are completed.

The second bending operation on the rods 3.5 is initiated as the rods are presented to grooves 3l in the roll 21. By referring to Figure 8, it will .320

be seen that this action is about to take place. The projecting end 42 of the bending die 4U has just made contact with the terminal end of the vrod 35 and continued movement of the rolls -26 and 21 will result in the die 4B bending the terminal end of the rod 35 around the rear edge 38 of the forming die.

At the completion of the bending operation .the rotation of the

rolls

26 and 21 is terminated. The piston rod 52 will have reached its limit of travel in a forward direction and accordingly the operator releases air from the rearof the cylinder and admits air under pressure at the forward end of the cylinder. This produces rearward travel of the piston rod and the rolls are thus rotated in direction to return them to their initial Figure 6. The rods 435 will all the rods It therefore a reverse position as shown Vin be retained by the forming die 32, having been bent around said die. becomes necessary to remove the die and for this purpose the invention .provides an ejector 68 xed to the rod 1i! suitably supported for reciprocating movement by the bearing .members 1| secured to the side frames `I 5 and. i6. The rod 10 is provided with an actuating handle 12 at its right hand end, as shown in Figure 3, and the operator grasps said handle to eiect reciprocation of the ejector 33. Theejector 6B is in alignment with the forming die 32 when said die is positioned as shown in Figure 6. The ejector is also provided with a cut-away portion approximating the shape of said forming die in cross section, being somewhat larger than the die, and upon reciprocating movement ofrod 1l) it will be understood that the ejector is caused to telescope the forming die, thereby positively pushing from the die the bent rods having supporting relation thereon. Movement of the ejector 68 in a direction toward the left, as shown in Figure 3, will have the effect of sweeping the forming `die 32 clean of the cold shuts, and the apparatus is thus placed in condition for another operation, which requires the location of headed rods in groove 36, and which are automatically aligned by positioning a slot 66 provided for the purpose by the apron-6|.

The completed cold shut produced by the bending machine of the invention is shown in Figure 1l, the same having a head 15 which is provided with an opening 15. The rst bending operation performed by the apparatus produces the large bend 11 having the radius identified byR1. The shank of the rod is bent over the front edge '31 of the forming die to form this bend asxpreviously explained, and it will be observed that 'the Vangle it will be Yseen that the the bent rods `from the upstanding end of each rod in 1 4a second bend in the articles by further formed thereby :is .somewhat less `than .a right angle. The first operating .roll 2B :and the .idle roller 28 constituteA the bending instrumentalities for this first operation. VThe second bend is identified bynumeral `18, the same having `a radius R2. This second bend issomewhat smaller than the first since the same is produced by the rear yedge 138 of the forming die. For producing this `second bend the .first operating roll actsas a car- .rier 'for the rods 35 .and which are bent over edge .38 by the .bending die4ll actuated and carried by Athesecond operating roll .21. The two rolls `therezfore function in a .conjoint :manner to produce this secondlbend'in the coldshuts.

.'Ihe invention .is not to Vbe limited to orby details `of .construction ofthe particular embodiment thereof illustrated by the drawings, as various other v.forms of the device will of 'Course be apparent to those skilled in the art without departing from the spirit of the invention or the vscope of the claims.

What .is claimed is:

1. In a bending machine, in combinatioma rst operating roll providing a carrier for the articles to be bent, a forming die secured to said roll, means'positioned with `respect to the first operating roll for initially bending the articles over the forming die, a second operating roll, and a bendling diesecured thereto for forming a second bend `in the articles by further bending them over the formingdie.

.2. Ina bending machinepin combination, a first operating roll providing a carrier forthe articles to be bent, a forming die secured to said roll, Va `second operating rollgmeans operatively connect- ,ing the rolls whereby they .rotate uniformly in op- .posite directions, a roller positioned with respect to the first operatingroll for initiallybending the articles v.over the .forming die, and a vbending die carried by the second operating roll for forming bending them over the forming die.

3. In a bending machine, in combination, a first `operating roll providing a carrier for the articles -to be bent, Aa forming die secured to said roll, means positioned withrespect tothe rst operating roll for .initially bending the articles over the Avforming die, a second operating roll, a bending die secured thereto ,for forming asecond bend in the articles by further bending them over the forming die, and `means for stripping the articles .from `the `forming die lfollowing the completion Yof a bending operation.

4. In a bending machine, in combination, arst operating roll providing a carrier for the articles to be bent, a .forming die secured to said roll, a second operating roll, means operatively connecting the rolls whereby they rotate uniformly in opposite directions, a roller positioned with re- 'spect to the vfirst operating roll for initially bending the articles .over the forming die, a bending die carried b vithesecond operating roll for formning a second bendin the articlesby further bending them over the forming die, .and means for :stripping the articlesfrom the forming die followiing the completion of a bending operation.

l 5. In a'bendingmachine, in combination, a'rst operating roll, a forming die releasably xed to Vsaid roll and having a front bending edge and-1a rear bending edge, said roll .providing a slot ad- ,jacent the front bending edge of the die for receiving Yarticles to `be bent, said slot .having 4a depth whereby said articles `are positioned with ,their outer ends projecting beyond `the forming die, a roller positioned with respect to the first tation on an axis parallel operating roll for initially bending the projecting ends of said articles over the front edge of the forming die, a second operating roll, and a bending die secured thereto for forming a second bend in the articles by further bending the projecting ends thereof over the rear edge of the forming die.

6. In a bending machine, in combination, a first operating roll, a forming die releasably xed to said roll and having a front bending edge and a rear bending edge, said roll providing a slot adjacent the front bending edge of the die for receiving articles to be bent, said slot having a depth whereby said articles are positioned with their outer ends projecting beyond the forming die, a roller positioned with respect to the rst operating roll for initially bending the projecting ends of said articles over the front edge of the forming die, a second operating roll, means operatively connecting the rolls whereby they rotate uniformly in opposite directions, and a bending die secured to the second operating roll for forming a second bend in the articles by further bending the projecting ends thereof over the rear edge of the forming die.

7. In a bending machine, in combination, a rst operating roll, a forming die releasably fixed to said roll and having a front bending edge and a rear bending edge, said roll providing a slot adjacent the front bending edge of the die for receiving articles to be bent, said slot having a depth whereby said articles are positioned with their outer ends projecting beyond the forming die, a roller positioned with respect to the first operating roll for initially bending the projecting ends of said articles over the front edge of the forming die, a second operating roll, a bending die secured thereto for forming a second bend in the articles by further bending the projecting ends thereof over the rear edge of the forming die, and means for stripping the articles from the forming die following the completion of a bending operation.

i8. In a bending machine, in combination, a first and second operating roll mounted for rotation on substantially parallel axes in associated relation with each other, means operatively connecting the rolls whereby they rotate uniformly in opposite directions, a roller spaced from said operating roll and mounted for free rotation on an axis parallel to said rolls, a forming die secured to said first operating roll, a bending die secured to said second operating roll, and a plurality of grooves formed in the periphery of said roller and said second operating roll respectively, the grooves in the roller having alignment with the grooves in the second operating roll.

9. In a bending machine, in combination, first and second operating rolls journalled for rotation on substantially parallel axes, means operatively connecting the rolls whereby they rotate uniformly and in opposite directions, a forming die fixed to the rst operating roll and having a front bending edge and a rear bending edge, said rst operating roll providing a slot adjacent the front bending edge of the forming die for receiving articles to be bent and which are supported with their free ends projecting beyond the forming die, a bending die fixed to the second operating rolls to project beyond the periphery of said roll, and a roller journalled for free roto said rolls and positioned in spaced relation with respect to the lst operating roll.

10. In a bending machine, in combination, first and second operating rolls having approximately equal diameters, means journalling said rolls for rotation on parallel axes with their peripheries in approximate contact, means operatively connecting the rolls whereby they rotate uniformly and in opposite directions, a forming die xed to the first operating roll and having a front bending edge and a rear bending edge both located within the periphery of said roll, said roll providing a slot adjacent the front bending edge of the forming die for receiving articles to be bent and which are supported with their free ends projecting beyond the forming die, a bending die xed to the second operating roll and having an end projecting beyond the periphery of said roll, a roller journalled for free rotation on an axis parallel to said rolls and positioned in spaced relation with respect to the rst operating roll, and power means for oscillating said operating rolls, whereby said rolls have rotation during a bending operation from a loading position where said slot in the first operating roll is substantially vertical to a terminal position where the projecting end of the bending die is located adjacent lbut in spaced relation to the rear bending edge of the forming die.

11. In a bending machine, in combination, a forming die having a front bending edge and a rear bending edge, a carrier for said die comprising a rst operating roll having the die fixed thereto for movement in an arcuate path as a result of oscillating movement of the roll, said roll providing a slot adjacent the front edge of the forming die for receiving articles to be bent and having a depth to cause the free end of said articles to project beyond the forming die, a bending element comprising a roller positioned substantially parallel with the aXis of said rst operating roll and in the path of the projecting ends of Said articles, whereby said projecting ends are bent over the front edge of the forming die when said operating roll has movement in its arcuate path, a bending die, a carrier for said bending die comprising a second operating roll having the die fixed thereto with a free end projecting beyond the periphery of the roll, means journalling said rst and second operating rolls in associated relation so that said projecting end of the bending die has movement in an arcuate path which intersects the arcuate path of said forming die, whereby said bending die has conjoint action With the forming die to further bend the projecting ends of said articles over the rear edge of the forming die, means operatively connecting said rolls to cause rotation thereof uniformly and in opposite directions, and power means for oscillating said operating rolls to effect movement of the forming and bending dies in their respective arcuate paths.

12. A bending machine as defined by claim 11 additionally including stripping means for stripping the bent articles from the forming die at the completion of a bending operation, and wherein said roller and second operating roll are formed with aligned grooves for maintaining control of said articles during movement thereof from the first bending operation to the second bending operation.

13. In a bending machine, in combination. a rst and second operating roll mounted for rotation on substantially parallel axes in associated relation with each other, means operatively connecting the rolls whereby they rotate uniformly in opposite directions, a roller spaced from said first operating roll and mounted for rotation on an axis parallel with said rolls, a forming die secured to the said rst operating roll, said forniing die being included Within the periphery of the roll and having a front bending edge and a rear bending edge, said rst operating roll providing a slot adjacent the front edge of said forming die for receiving articles to be bent so that they project beyond the forming die, a bending die secured to the second operating roll and having a free end projecting beyond the periphery thereof, a plurality of grooves formed in the periphery of said roller and said second oper-ating roll respectively, the grooves in the roller having alignment/With the grooves in the second operat- 10 ing roll, and a slotted apron having a xed position over the rst operating roll for initially aligning the articles When inserted in the slot in said roll, the slots in said apron having an aligned relation with the grooves.

THORVAL LARSEN,

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 554,687 Haskins Feb. 18, 1896 693,325 Leiger Feb. ll, 1902