US2501241A - Bending machine - Google Patents

Description

Mamh 2L, 195@ R. M. SHAW, JR 2?50924 BENDING MACHINE Filed Ooi?. 10 1946 3-SheetS-Sheet l '35.3 y IN1/ENTOR- j@ @Mmmm/M1, ,E li@ Ja Bw' @CIM/Q m Z3 A T'l 'ORNE YS.

R. M. SHAW, JQ

lVamzhZlL 195@ BENDING MACHINE 3 Sheets-Sheet 2 Filed Ooi, 1.0D 2,946

.WITNESSEQ` March ZH, 1950 R. M. SHAW, JR 2,501,241

BENDING MACHINE BY wrm Patented Mar. 21, 1950 UNITED STATES PATENT O'FiCE BENDING MACHINE Vania Application October 10, 1946, Serial No. 702,463

1o claims. l

The invention relates to machines useful in bending bar, tube and strip materials to different shapes. Bending machines as heretofore ordinarily constructed were more or less individually restricted in their performance to definite types of work.

The chief aim of my invention is to enlarge upon the versatility of such machines so that different bending operations which heretofore entailed the employment of separate machines can be carried out in a single structure.

How the foregoing and other important objects and advantages are realized in practice will appear from the following detailed description of the attached drawings wherein:

Fig. l is a view in top plan showing a universal bending machine conveniently embodying my invention and arranged to perform one type of bending.

Fig. 2 is a longitudinal section taken as indicated by the angled arrows II-II in Fig. l.

Fig. 3 is a fragmentary View in elevation looking as indicated by the angled arrows III-III in Fig. 1.

Fig. 4 is a view like Fig. 2 showing the machine arranged for a different bending operation, the section being taken as indicated by the angled arrows IV-IV in Fig. 5.

Fig. 5 is a horizontal section taken as indicated by the angled arrows V--V in Fig. 4.

Fig. 6 is a view corresponding to Fig. 1 showing the machine arranged to perform another type of bending.

Fig. '7 is a fragmentary detail sectional view taken as indicated by the angled arrows VII-VII in Fig. 6.

Figs. 8 and 9 are views in turn corresponding to Fig. 1 showing the machine variously arranged for use in carrying out still other types of bending.

With more detailed reference first more particularly to Figs. 1-3 of these illustrations, it will be noted that my universal bending machine comprises a circular face plate I which is affixed to a bull gear I I confined within an annular recess I2 in a bed I3 having a supporting frame I4. The bull gear II is arranged to be rotated by an intermeshing pinion I which is also recessed into the bed I3 and whereof the shaft I6 is adapted to be driven through a worm gear speed reduction unit Il by a reversible electric motor I8. Extending up through the bull gear II and the face plate I0 is an independently rotatable shaft I9 which is adapted to be driven, through another worm gear speed reduction unit 20, by a separate reversible electric motor 2l. Fulcrumed on the shaft I9 above the face plate Ill are two arms 22 and 23 respectively with slide carriages 2li and 2 5 which are individually adjustable along said arms by means of screw spindles shown at 26 and 2 and which rotatively support upstanding stud shafts 28 and 29. To these stud shafts are removably keyed circumferentiallygrooved forming rollers 3B and 3l respectively and also spur gears 32 and 33 to mesh with a spur gear 3a which latter is removably keyed, together with a third. circumferentially-grooved forming or master roller 35, to the shaft f3. 1n order to brace the stud shafts 28 and 29 against displacement during the bending, their upper ends are engaged in bearing blocks 35 and 3'! which are restrained by parallel tension rods 33 and 39 extending from collars 4i) and il free on the upper end of shaft I9. As shown, the rear ends of the tension rods 38 and 39 are threaded to permit backing-off or advancing of abutment nuts at 42 and f1.3 when the slides 2d and 25 are being adjusted along the arms 22 and 23. The bracing means just described is employed only in large heavy-duty bending machines, and may be dispensed with in smaller machines designed for operation on light work. The arm 22 is detachably connected to the face plate ll! by removable dowel pins 45, and the arm 23 in this instance fixed against rotation about the shaft I9 by a retractable latch Mi (Figs. 1 and 3) in engagement with a notch 4l' in the periphery of the table I3. For use during certain types of bending as later explained, the arm 22 is likewise provided with a similar latch 43.

The machine is further provided with a fourth roller 49 for use in other bending operations as also later explained, the same being supported at the outer end of the piston rod 5l! of a pressure fluid cylinder 5I. As shown, the cylinder 5I is adjustable by means of a screw spindle 52 along a xed guideway 53 formed as a part of the machine framing and extending radially of the table I3 as best seen in Fig. 1.

In Figs. 'l-3, the machine is arranged for bending bars or the like such as the one indicated at B which is passed between the auxiliary rollers 3D. 3l and the master roller 35, and in readiness for the bending, the fourth or press roller 49 is yieldingly urged against it by admission of pressure fluid into the rear end of the cylinder and so maintained throughout the bending, the latch 48 being withdrawn. With this preparation, the motor l is operated to rotate the face plate Ill clockwise or in the direction of the arrow in Fig. 1, to move the arm 22 for moving the roller relative to the rollers 3l and 35 in accordance with the curvature desired in the bend, for example to the position shown in dot-and-dash lines in Fig. l, whereupon the motor I8 is stopped. Due to the idiosyncrasy of the worm gearing in qspeed reduction unit l1, `the face plate I D and the arm 22 `will be locked `against subsequent accidental movement. In this initial step, the bar B will be deflected as also shown in dot-and-dash lines by action of the roller 30, while its movement otherwise will be prevented by virtue of its engagement between the rollers r3| and 35. Finally, the motor 2i is started to drive the :gears Y32, 33 and 34 in the directions indicated bythe arrows on them with the result that the bar B is advanced endwse in the machine and bent to `a prescribed curvature in a manner readily understood from Fig. l.

For use in bending tubes the machine is arrangedlas shown in Figs. 4 and 5, i. e. by removing the-gear@ and roller 35 from-the shaft I9 andreplacing them with a die 35a; vsubstituting conca-vely-grooved vrollers A30a and Zia on 'the shafts `28 and .29 for the rollers -30 `and 3| `employed in the `first described instance; vand withdrawing the roller 49 to inactive position, As exemplified, the die `ais-inthe -form ofa'quadrant and has a concaved groove to rmatch the grooves of the rollers 3a-andv3la and the outer curvature of the tube T. All being now vin readiness, the motor I3 is started to drive the table -plate IU clockwise as before with attendant movement of the arm 22 and -bending'of thetube about the die 35a by action of the roller 39a as indicated in dot-and-dash lines. In this Way angular bends can be made up to ninetydegrees.

In Figs. `6 and 7, I have shown rthe machine arranged to effect a profile bend. Here smaller ciroumferentially-grooved rollers SML-3l b and 35D lare substituted for the rollers 3D, 3| Vand 35 of Fig. l. The die to which the bend is to be made is :designated by :the character D, the same being placed with the edge-flanged strip S which is to be bent in a -holding channel C, and this vassemblage passed endwise vthrough the interval ybetween 'the auxiliary rollers 30h, Bib, and the master roller 35D for advance by them as the associated intermeshing gears 32, 53 and 34 are vdriven upon starting 'of the motor 2l. instance the ymotor I8 'is not used and as a 'consequence the face plate Il) and the arm -22 are heid against rotation by the worm gearing I1. As the die :holding channel C is advanced with the strip S in place, the latter is pressed to the shape of the die surface S by the roller 49 which is constantly urged outwardly yieldingly by the action "of the pressure fluid admitted to the rear end of the cylinder 51.

Fig. 8 shows another way that profiled bending can 'be accomplished in the machine. Here a die D is bolted fast to the face plate ll! andthe latter rotated while the strip S is pressed into the curved groove g of the die by the cylinder actuated roller I29, none of the `other rollers 'being used in 'this instance.

In Fig. 9, the machine is arranged to carry out another type of bar bending. In this case still smaller circumferentially grooved rollers 3Go and 3lc are used on the shafts 28 and 29 and a die 35C on the shaft i9. As shown the die 35e has a concaved recession or notch 54 in its front end in the longitudinal axis of the machine and facing the interval between the -auxiliary rollers 39C, 3 lc, to the shape of which the bar B' is to be bent, said In this bar B being buttressed by the rollers 30C and 3lc and held in position between them and adjacently placed studs or auxiliary rollers 55 and 5B on the slides. Neither the face plate I0 nor the rollers 30e, 3lc are driven in this instance, the bending being effected simply by means of the cylinderactuated press roller 49 without endwse advance of the work.

Due to the retractability of the slides 24 and 25 along the arms 22 and 23 it is obviously possible to employ rollers and gears differing in size as occasion'may require in making bends of different radii; and it is to be understood that in accordance with my invention, removable dowel pins like those herein'before described in connection with the arm 22, are provided for detachably securing the arm 23 to the face plate Hl so that it may be made to swing about the shaft I9 in making reverse bends, if desired, with the arm 22 latched.

Having thus described vmy invention, I claim:

yl. A bending machine of the character described having a faceplate; la shaft about which the face plateis rotatable; means constructedand arranged `for driving the face plate; 'a master roller or die fast on the shaft; a pair of arms fulcrumed on the shaft and each carrying an auxiliary roller to cooperate with the master roller or die during the bending; and means whereby one arm is securable to the face plate for rotation and the other is -xable against movement.

2. A bending machine according to claim l, Vfurther including means for rotating the shaft independently of the face plate; and a group of intermeshing gears whereby the auxiliary rollers are driven from said shaft.

3. A bending machine according to claim l, further including a retractable press roller; and pressure means for yieldingly urging the press .roller toward the master roller to assist in effecting certain types of bending.

4. A bending machine according to claim' 1, lfurther including means for rotating the shaft independently of the face plate; a group of intermeshing gears whereby the auxiliary rollers are `driven 'from said shaft; mounting slides respectively for the auxiliary rollers; and means whereby the slides are adjustable along the arms to permit the interchangeable use of rollers and/or driving gears of different sizes in the machine.

5. A bending machine of the character described having a face plate; a shaft about which the face plate is rotatable; a motor and interposed worm gearing Afor driving the face plate; a separate motor and interposed worm' lgearing for driving the shaft; a master roller yfast on the shaft; a pair vof arms independently fulcrumed on the shaft and each 'carrying an'auxiliary roller to cooperate with the master roller in the bending; means whereby one arm is sccurable to the plate for rotation therewith and the other arm is securable against movement; and a group of intermeshing 'gears whereby the auxiliary rollers are Vdriven from said shaft.

6. A machine for bending rods, tubes and the like, comprising a master roller and two cooperative auxiliary bending rollers between which `and the master roller -the specimen to be bent is placed; a pair of arms ffulcrumed upon the axis of the master roller on which the respective auxiliary rollers are rotatively mounted; means for moving one of the -arms through a definite angle about the axes of the master roller while the other arm is 4held stationary to yinitially flex the specimen about the master roller; and means for thereafter positively driving the three rollers to progress the specimen endwise in the machine.

7. A bending machine according to claim 6, further including a retractable press roller to cooperate with the master roller in the interval between the auxiliary rollers; and means for yieldingly urging the press roller toward the master roller during the bending.

8. A machine for bending rods, tubes and the like comprising a master roller and two cooperative auxiliary bending rollers between which and the master roller the specimen to be bent is placed; a shaft to which the master roller is secured together with a coaxial gear wheel; a pair of arms fulcrumed on the shaft of the master roller on which the auxiliary rollers are rotatively mounted together with individual coaxial gear wheels, in mesh with the gear wheel associated with the master roller; means for moving one of the arms about the shaft of the master roller through a definite angle while the other arm is held stationary to initially ex the specimen about the master roller; and means for thereafter driving the shaft of the master roller so that it and the auxiliary rollers are rotated, through the intermeshing gear wheels, to progress the specimen endwise in the mechanism.

9. A bending machine according to claim 8, further including a retractable press roller to cooperate with the master roller in the interval between the auxiliary rollers; and means for yieldingly urging the press roller toward the master roller during the bending.

10. A bending machine according to claim 8,

further including means for adjusting the axes o! the auxiliary rollers along the respective arms to permit interchange of rollers and gears of different sizes in the machine.

RALPH M. SHAW, JR.

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

UNTED STATES PATENTS Number Name Date 567,811 Lefevre Sept. 15, 1896 1,272,999 Rehben July 16, 1918 1,387,934 Monteith Aug. 16, 1921 1,436,225 Aguiar Nov. 2l, 1922 1,446,374 Books Feb. 20, 1923 1,559,454 Pritner Oct. 27, 1925 1,707,991 Oskamp Apr. 9, 1929 1,900,160 Cipko Mar. 7, 1933 2,022,915 Jensen Dec. 3, 1935 2,095,331 Huck Oct. 12, 1937 2,143,443 Kelso Jan. 10, 1939 2,169,669 Wachs Aug. 15, 1939 2,286,255 Brooks June 16, 1942 2,303,059 Misfeldt Nov. 24, 1942 2,348,193 Combs May 9, 1944 2,397,608 Johnson Apr. 2, 1946 2,399,892 Sato May 7, 1946 FOREIGN PATENTS Number Country Date 11,314 Great Britain May 18, 1903 23,827 Great Britain Dec. 31, 1900 146,576 Great Britain July 5, 1920 342,653 France July 13, 1904 417,204 France Aug. 25, 1910 691,604 France July l5, 1930

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