US2510183A

US2510183A - Tube bending machine

Info

Publication number: US2510183A
Application number: US21485A
Authority: US
Inventors: George E Luce
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-04-16
Filing date: 1948-04-16
Publication date: 1950-06-06
Anticipated expiration: 1967-06-06

Description

June 6, 1950 a. E. LUCE 2,510,183

' TUBE BENDING MACHINE Filed April 16, 1948 2 Sheets-Sheet 1 INVENTOR. George E. Luce After-Hays 2 Sheets-Sheet '2 G. E. LUCE TUBE SENDING MACHINE June: 6, 1950 Filed April 16, 1948 g BE:

JNVENTOR. Geo/ye F. Luce N NM Z 3 Afzarneys Patented June 6, 1950 UNITED STATES PATENT OFFICE TUBE BENDING MACHINE GcorgeE. Luce, Fort Valley, Ga. Application April 16, 1948, Serial No. 21,485

6 Claims.

This invention relates to tube bending unachines. 7

An object of the invention is the provision of a machine for bending tubes to form rectangular frames in which grooved rolls are mounted at the 1 shifting the rollers away from the associated rolls to permit the application of the tube, simultaneous oscillation ofthe arms being effected through the medium of a power driven device. 1 1

A further object of the invention is the provision of a machine for bending tubes into rectangular frames in which a power driven device moves a grooved roller around a roll for forming a bend in the tubing while manual means is employed for shifting the roller away from an associatedroll during the application of the tubin or a section of the tubin to a roll, a roll and associated roller being employed for each bend at a corner of a frame to be manufactured, arms carrying the rollers through an arc of approximately ninety degrees during the bending operation. The power driven device includes a hydraulically actuated piston for operating a plurality of cranks which are rigid with the respective arms carrying the rollers.

' The invention is best understood from a consideration of the following detailed description in connection withthe accompanyi drawings forming part of the specification, nevertheless, i'tis to be understood that theinvention is not confined to the disclosure but is susceptible of such'changes and modifications as shall define no material departure from the salient features of the invention as expressed in the appended claims;

In the drawings:

Figure 1 is a plan view of a' table with parts broken away showing my tube bending machine supported thereby, w 1

Figure 2 is a transverse vertical section of the machine and table taken along the line 2-2 of Figure 1,

Figure 3 is a longitudinal side view of the machine and table with parts broken away, and

Figures 4, 5 and 6 show more or less diagramma ical y three of the sta es of the operations I of mytube bending 2, machine and the relative positions of the operative elements.

Referring more particularly to the drawings, to designates a table top which is supported by angle iron legs ll, l2 and I3. 'An electric motor I4 is set in operation by a switch I5 for driving a hydraulic pump I6. The motor and pump are mounted on a bracket I1 secured to the leg II.

A cylinder has a closed outer end provided with ears 2! pivoted at 22 on a plate 23 depending from the under face of the top H). The cylinder is disposed centrally and longitudinally of the table. The inner end of the cylinder 20 is closed except for a central passage which receives a piston rod 25 and may be supported by a bracket (not shown) depending from the under face of the top H). A pipe 26 connects the inner end of the cylinder with the pump l6 while a pipe 21 connects the rear or outer end of said cylinder with the pump, A valve operating rod 28, when reciprocated, controls a valve (not shown) within the pump for cutting off the flow of a fluid to one of the

pipes

26 or 21 while releasing the fluid to the other pipe. Thus, a piston 29 in the cylinder 2,5 will reciprocate the rod 25 in opposite direction depending upon the flow of the fluid in the pipes. The valve (not shown) in the pump may be of the conventional type for controlling .the flow. of fluids to and from the pump to the ends of the cylinder. A crosshead 30 is disposed transverselyof the table ID at the under face thereof and connected to a reciprocating bar 3!. allel to crosshead 30 is secured to said crosshead by braces 33. A bracket 34 attached to and depending from the bar 3| has .pivoted connections at 35 with the piston rod 25. Parallel links 36 are attachedpivotally at 31 to the ends l8 of the bar 32. The outer ends 19 of said links 36 have pivotalconnections at 39 with the outer ends .of associated arms or cranks 40. All of the links I3, bars 3| and arms 40 just described are disposed below the table top [0.

. Links. 4|. are pivoted at 42 on the ends 24 of the crosshead 30. An arm 43 each is pivotally' connected to the outer end 38 of each link 4| asshown at 44. An axle 45 rises from the free end, 41 of each arm 43 to which'is secured the irmer. end 48 of an arm 46. The connected arms 43 and.

46 form in effect a bell crank generally indicated.

at 49. V A grooved r011 50 is mounted on each axle 45 and is disposed in a horizontal plane. A grooved roller 5| is mounted on an axle 52. carried by a. lever 53 and an end of a bracket 54. The other;

A cross-bar 32 pare end of the bracket is attached to the lever 53 by a bolt 55 which is secured to the arm 46 and which forms a pivot for said lever. A handle provides a manual means for rocking the levers 53. It will be noted from Figure 3, that the grooves in the rolls 50 and the rollers 5| are semi-circular in cross-section so that the space 58 between a roll and a roller is substantially circular for receiving neatly a piece of tubing 60, Figures 1 and 4 to 5, inclusive.

The arm-40 is connected to an arm or crank BI and these connected arms form a bell crank.

An axle 62 rises from the arm 40 and joins the inner ends of the arms 40 and 6| for. rotatably supporting a roll 63 having a peripheral groove identical with that shown in roll 50:01? Figures 2 and 3. A roller 64 identical with that shown at 5| in Figure 3 is mounted on an axle 65. This roller has a peripheral groove which cooperateswith the groove in the roll 63 to receive neatly the pipevfifl. A bolt fili pivots alever 6 1 on the arm 6| and cooperates withthe axle 65 for securing a lsupporting bracket'68' for the roller 64 on said lever. A handle 69 rocks the lever 61 outwardly for example, on each arm 6| to the position indicated in broken lines at 51.

An eccentric disk 10 is pivoted on a bolt 1| secured-to the-table top ll. A handle 12 isadaptedto rock the disk 1|! for pressing against the pipe 60 when said pipe is being bent and for retaining it in the grooves of the rolls.

The valve actuating rod 28 is secured to a reciprocative rod 15 by amember 76., The rod 15 is mounted in a guide 11 fixed to the leg A lever 18 pivoted at 19 on ears projecting from said leg is connectedat 80 with the outer free end of the rod 15 for reciprocating said rod.

:Spaced stops 8| and 82 are 'adjustably secured to therod and each stop carries a spring 83 adapted to be engaged by a horizontal portion ofa-bar 184 whichhas a vertical portion 85 secured rigidly to the depending bracket 3.4. The stops limit the inward and outward movements ofjthe piston. inthe cylinder 20 whilethe springs 83cushion the piston and the piston rod at the'cends of the strokes of said piston. Since therlever 18 operates the rod :75randlikewise the valveoperating means 28 for controlling the flow of i'fiuidatocthe opposite ends of the cylinder :20, the stops BI and 82 will be shifted in accordance with varying positions of the piston 29.

Thezlegs of the table are braced. bylongitudinal bars 85 which are secured to the pair ofnlegs l3 and .thepair :of legs H and 12. .The transverse barsBficonnectedbetween the pairs'of legs |3 and 2, l3 alsosaid in stabilizing thelegs of the table;

The operation of-my machine is asufollows'z With thelelements of the machine shown in the variouspositions inFigures 1, 2 and 4, the levers 6 are rocked to the dotted line position at 51 shown in Figure l so that the tubing 65 may be applied to the grooves in the rolls 63. The levers 61' are then returned tooperative positions-shown in full lines, or rather positions a little outside the fullllinerpositions wherein rollers M are disp'osedin advance of the positions of arms 6|. The tubing is then held in position in the grooves of the rolls 63 by the disk 10 and cooperating rollers 64, the latter, due to their advanced positions, being adapted to exert a pushing and bending action on tubing 60 without danger of rollers M slipping inwardly past rolls 63 during the bending operation. At this time the valve actuating rod 28 is in a neutral position and fiuidpressure from the pump l6 has been cut-oil to the cylinder 20.

The lever 18 is now moved in the direction indicated by the arrow A in Figure 3 so that the valve in the pump will be opened to the pipe 21 for supplying fluid under pressure to the outer end of the cylinder 20, thereby causing the piston 29 to be moved inwardly for shifting the crosshead 30 in the direction of the arrow B in Figure 1'. This action rocks thepairs of" hell cranks which include the arms 61- and through the respective links 36 and 4| thereby carrying the respective levers 61 and 53 to the positions indicated in Figure 5 from the position illustrated in Figure 4. However, it must be borne in mind that the-levers 53 must be rocked to move the rollers 5| away from the rolls 50 in order that the bent ends 50a of the tubing may be forced against the grooves in the rolls 50, spaces being thus provided between rollers 5| and bending oll tu andet earmsfi eo r u ins fi ei siemporarily lifted over rollers 5| and their handles 5 and then lowe instub rm 6W o- .s a he e ter r viin h arr s-9 Q1.1 ;5 th e-r9 1- rs 6 then ev lv a undl 5 41 t part rotation of arms $6 1,. the tubing: isbent -Q The lever 1-8- were a th a te lnQYQ in t opp sitec i es qn ndie ted b th .-al= .-ew ls a th rod-2, w swearr v s lq r tiqnze th v a e-12 th 9. 4 11 lan 1211 11 311 26 conduc flui un e r su e- 2 he linea ise or t c linder?! lh e f ti th 121 39 39 t wa e l s ree lim s-r1 l me he tll a msi a .cg tree-i 1 sit on 9 l e in th P iQQS :Q Fi 6, the Precaut l t l p fiw P H K- JE QYW 83. 5 P th y W i RPQS UQ a P1152 sec eenegfl neretien A h wn-i i ur the ofl x with; .5 wi volv around therespective rolls.50 with rollers slightly iniadvance 0f the l'atter for bending the sections are altright angles to vthe sections a of the tubing about rollsJSll to f nally arrive at the pos' t jen. ill e -t a .fije f u ,qwe l' tme the manufacture of the rectangular frame of tube. Thea'rms 5| at this time have returned to theini't'i'al positions shownlin Figure .4. The various levers {61 .and '53 and the lever wer rocked in the proper outward directions and roll"- ers 5i and 54 swung or rotated clear of frames 61.6011. and BUCJand" rolls 5'lljandl6i3ancl'the arms 60a and the ends 'GU'c temporarily expandedland warped by hand and lifted to releasethefframe. The alve the pump is will be shifted to the neutral position so jt'hat'fthe machine, will be ready for succefedin'gbending'operations.

It willb'e noted that when t e rod 15- reoiproc'atefd the stops 8 and "S Z are shifted away from therod 84 "for setting the valve in the pump in a new'po'siti'on'. "Thus, Figure "3, the valve will be in a neutral position, so that when the l'ever'1-8- is ro'cked in "the direction "in'di'oat e'dlby' of the tubing are bent by the bending fixtures or rollers 5| and 61 which may be moved "to inoperative positions by the respective levers-61 and 53 to permit the application of the intermediate portion of the tubing 50 to the -dies =63 and the bentsections 60a toithe dies 50. These levers also release the bending fixtures for the removal of the completed frame so'that subsequent tubings may be applied to the bending machine. The frames are employed in the manufacture of chair seats.

What I claim: g

l. A mechanical movement for a bendingmachineand the like, including the combination with a reciprocable drive means, a transverselyextending crosshead connected thereto'and reciprocated thereby, and a support for the drive means and the crosshead, of a group of shafts rotabably mounted on said support in two pairs spaced apart and disposed in parallel relation, a pair of opposite and outwardly-projecting arms individually secured on one pair of shafts, a second pair of opposite and inwardly-projecting arms individually'secured on the other pair of shafts, a pair of links pivotally connected to corresponding opposite portions of the crosshead and to the outer ends of the first-mentioned pair of outwardly-projecting arms, and a second pair of links pivotally connected to other corresponding portions of the crosshead, said one pair of shafts being partly rotated in opposite directions to each other and the second pair of shafts being simultaneously rotated individually in opposite directions with respect to the shafts on the same sides of said reciprocating drive means.

2. A tube bending machine comprising a table, a plurality of grooved rolls rotatably mounted on the table, a roll located at each corner of a parallelogram, a pair of the rolls receiving an intermediate portion of a tube to be bent, a bell-crank pivoted on the table adjacent each roll, a grooved roller on an arm of each bell crank, a crosshead,, means connecting the other arms of the bell crank with the crosshead, means for reciprocating the crosshead for rocking the bell cranks simultaneously, the arms carrying the rollers of one pair of the bell cranks extending in an opposite direction to that of a corresponding pair of arms of the other bell cranks so that one pair of arms will move the associated rollers through an arc around the cooperating rolls for pushing and thereby bending portions of the tube when the crosshead is shifted in one direction, the other arms and associated rollers moving idly around the other rolls in an opposite direction for engagement with the tube for pushing and thereby bending the ends of the tube inwardly toward each other on the adjacent rolls when the crosshead is shifted in the opposite direction during return movement of said one pair of arms and its associated rollers to initial idle positions.

3. A tube bending machine comprising a table, pairs of shafts spaced apart and carried by the tables, the shafts being so arranged that one shaft is located at each corner of a rectangle, a bell crank secured to each shaft, a grooved roll mounted on each shaft, the grooves in one pair of rolls receiving an intermediate portion of a tubing to be bent, a roller mounted on an arm of each bell crank and provided with a peripheral groove, one pair of the rollers cooperating with the first-mentioned one pair of rolls for pushing and thereby bending portions of the tubing on said rolls when the bell cranks are rocked, the tubing being received between the grooves in the first-mentioned rolls and cooperating rollers, the roller-carrying arms of one pair of bell cranks extending in an opposite direction to that of the roller-carrying arms of the other bell cranks,

means for rocking the bell cranks simultaneously in opposite directions, means connectin the other arms of the bell cranks with the rocking means for rocking the pairs of arms simultaneously in opposite directions, the mentioned pairs of rollers alternately bending. portions of the tubing on the adjacently-disposed pairs of .rolls during rocking of the bell cranks in said opposite directions. I

'4. A tube bending machine comprising a-table, pairs of shafts spaced apart and carried by the table, the shafts being arranged so that one shaft is located at each corner of a rectangle, a bell crank secured to each shaft, a grooved roll mounted on each shaft, the grooves in one pair of .rolls receiving an intermediate portion of a tubingto be bent, a roller mounted on an'arm of each bell crank and provided with a peripheralgroove, one pair of the rollers cooperating with the firstmentioned pair of'rolls for pushing and thereby bending portions of the tubing on said rolls when the bell cranks are rocked, the tubing being received between the grooves in the first-mentioned rolls and cooperating rollers, the roller-carrying arms of one pair of. bell cranks extending in an opposite direction to that of the roller-carrying arms of the other bell cranks, means for rocking the bell cranks in opposite directions, link means connecting the other arms of the bell cranks with the rocking means for rocking the mentioned pairs of arms simultaneously in opposite directions, the mentioned pairs of rollers alternately bending portions of the tubing on the adjacentlydisposed pairs of rolls during rocking of the bell cranks in opposite directions, and a freely rockable lever on each roller-carrying arm for supporting the rollers, the levers when rocked moving the rollers away from the associated rolls to provide clearances when a portion of the tubing is being applied to said rolls.

5. A tube bending machine comprising a table, pairs of shafts spaced apart and carried by the table, the shafts being arranged so that one shaft is located at each corner of a rectangle, a bell crank secured to each shaft, a grooved roll mounted on each shaft, the grooves in a pair of rolls receiving an intermediate portion of a tubing to be bent, a roller rotatably mounted on one arm of each bell crank and provided with a peripheral groove, one pair of the rollers cooperating with the first-mentioned pair of rolls for bending the tubing on said rolls when the bell cranks are rocked, the tubing being received between the grooves in the first-mentioned rolls and cooperating rollers, the roller-carrying arms of one pair of bell cranks extending in an opposite direction to that of the roller-carrying arms of the other bell cranks, means for rocking the bell cranks in opposite directions, link means connecting the other arms of the bell cranks with the rocking means for rocking the mentioned pairs of arms simultaneously in opposite directions, the pairs of rollers alternately bending portions of the tubing on the adjacently-disposed pairs of rolls during rocking of the bell cranks in opposite directions, said rolls and roller-carrying arms being located above the table, and the of dies, a bending fixture for each die, means,

moving a pair of the bending fixtures in opposite directions through an approximate arc of swam momma dies to aim at pair at ifbm air intermediate" 'rtidm 6f the" tubing; mane-m1 m'c'iving the other air df-be'n'dfng'fii wrest 111* opposite directiorrs'erouncta pnftiondf the-periphery of we assd'ci'atd dies-so'th'at s'aid hst mhtl'one'd -fixtures wiir be in positiowtb' en: gage tlieflient portions" of the tubiiig; mea'n's foisirhultanebuslytactuating the pairs-of the moving means alternately in opposite directions'for causing one pair of the-fixtures to' bend pbr'tidnsof t-t'x' tubing" oni'ai'pair o'fth' associateddis while the other pair of fixtures is shifted inbpefatively', the actuating m'ean-ca'usingreverse m'ovem'ents" oft-he fiicturs'so'that thelast mentiuned fixtures wm' 'bend the free portions of the tube-while the 15 other" fixtureswill: be' moved ta inoperative pm"- tionsiand means for moving: the fixturesiin re= tractedwelation with'the dies;

Number Name Date 324,230 Veit Aug.- 11, I885 957,200 Gail Y May 10, 1910 mes-570. Groehn -7 July 1,1930 10 1;-'194-,-691- Houser Mar. 3; 1931 2,-414;926 Burke Jan. 28, 1947 FOREIGN PATENTS- Ittiy v 0; 1 3,1. 60,774" msrway Apr. 24, 1939