US1302870A - Die for making core-unit members for radiators. - Google Patents

Description

C. F. SPERY. D IE FOR MAKING CORE UNIT MEMBERS FOR BADIATORS.

APPLICATION FILED OCT. l8, IQIB.

Patented May 6, 1919.

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C. F. SPERY. DIE FOR MAKING com; UNIT MEMBERSVFOR RADIATORS.

APPLlCATION FILED OQT. I BI I918.

Patented May 6, 1919.

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c. F. SPERY. DIE FOR MAKING CORE UNIT MEMBERS FOR RADIATORS.

APPLICATION FILED OCT. I8. I918. 1,302,870. Patented May 6, 1919.-

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TK IT D STA PATENT OFFICE CHARLES F. srnmr or CHICAGO, ILLINOIS, issisnon TOHOOVEN RADIATOR 00., or

' emcneo, .ILLINoIs, A CORPORATION or oKLAHoMA.

DIE non iinxiivsloonn nnirmn vrnnns FoR RADIAToRs. i

Be it known that I, OHARLns- F. SPERY, a citizen of the United States, and a. resident of the city of Chicago, in. the countyoif Cook and State of-Illinois, have invented a certain new and useful Improvement in Dies for Making Core-Unit Membersfor Radiators; and- I do hereby declare that the following description of myj said invention, taken in connection with the accompanying sheet of drawing, forms'a full,'olear, and exact specification, Which will enable others skilled in the art to which it appertains to make and use the same.

My invention relates generally to iniproveinents in dies for making core unit 111embersfor radiators; and it consists, esseliti ally, in the novel andipeeuliar eqmbina; tion of parts and detailsof construction, hereinafter first fullyt set forthf and described and then pointed out in the The object of thisinvention pro. duction of efficient and serviceable means whereby the members of; a core-unit for radiators can be rapidly and yery accurately produced; These core units are the: subject of Letters Patent of the "United States,

1917, to which reference may ibe had for a full disclosure thereof. ,B'riefly described, each core-unit bomprises two Walls which are corrugated transversely, the corruga} tions being approximately semihexagonal, there being between the apexes of corrugations a series of. ap ro imately emt circular groovesforming, when ami ltiplic ity of core-units are assembled, ater passages. These walls or strips [of metal are of various lengths to produce radiator bores of difierent heights and they are Connected at their ends by lock-seams to securely-unite these pairs of strips. They are made from Very thin sheetmetal, copper or brass, usually the latter, which is purchased from the rolling mills in rolls ofproper Width, and, as a ribbon, is. passed between corrugating rolls togive to the ribbon approximately the proper corrugations. This ribbon, which is about 100 feet long, (more or less) is then passed to a forming die operated ina suitable power punching press wherein the ribbon receivesits final shape, is cut off to proper lengthgand the ends formed with themale and female parts con- Specification of LettersPatnt.

Pa-tented may 6, 1919.

App lieat i oii flied October 18," 19 18.,Seria11%. 2 53.755. 7 I

stitutingthe locking ,Sfitllni This die and its coactingpunch are of peculiar construction and are fully illustratedin' the drawings forming a part of this specification, fa-nclinwhich Figure 1 is plan offthe punch Which e erates in connection with thefdiefi Fig. 2 a side eleiration of this punch; and Fig.

*3 isfanenlarged sectional View of the same,

onliiie3-3 of Fig. 21Fig. 4! is a plan of the die, details shown in Fig. 7, being omitted. Fig. 5 is an end view thereof. Fig. 6 is elevation of the die. Fig. 7 is a similar View of the die drawn on an inp creased scale, parts being removed to disclose deta ls of constructlon. F1g."81s a trailsverse' sectional View on 11116 8+8" of lgk'l." Figs. 9 and 10 are lo g t ifi l tional elevations of a fragment of the die, the section being 011 line 1010 of'Fig. 7. Fig. 11 is an edge View of a pair of strips forming a core-unit, ready for havimi their ends locked by a double seam. Fig, ,12 is an outline plan of a strip, details being omitted. F ig. 13 is a longitudinal, sectional eleya'tion of thedie and punch when the latter in depressed position, and Fig. 14 is a transverse sectional View of the same on linelf r ldof Fig. 13 1 I Like part sare. designated by the same characters and symbols of reference in all the variousfignres. H i i 'A, in Figs. 10, 11,and12, designates one "of the members of which a core-unit is formed. There is always a pair of these members to form a unit, Whichmembers are alike, and when placed together with the corrugations pointing in the same direction, but reversed or placed end-for-end, there is at each end a male a femalegelement of a lock seam, as illustrated in Fig. 11.

The die proper comprises a plate or shoe 12, of a length somewhat exceeding the longest core-unit Which it is desired to produce, and of suitable widthl Thisplate or shoe has a seriesof bolt-holes 13, by which, and suitable bolts, not shown, the die is securely fastened upon the bed ofa power punching press having sufficient capacity to receive the same. Longitiidinally, this shoe has two Walls, 14, ltflin parallel spaced relationship, there being in said Walls a gap 15, the object of whichwill farther on appear. i

Upon the walls 14, 14*, there are located metallic strips or flat bars 16; and secured to the walls by, preferablycountersunk, screws 17, said bars 16 having longitudinal, oppositely directed, ledges or shoulders 18. In the space between the vertical walls 14, 14 and at each side of the gap 15, there are located steel pads 19, 19, the upper surfaces of which are transversely corrugated, as at 20, and between these corrugations there are a series of longitudinal, approximately semicircular projections '21, as shown in Figs. 4, 7 and 8. I

At one end of the shoe there is an extension 22, to which there is bolted a bar 23,

i are located coil-springs 30, which normally support'the pads 19, 19 and force them against the ledges 18 on the flat bars 16.

In the gap 15 of-the shoe there is mounted a shearing element, comprising two memhers 31, 31 inspaced apart relationship, as best shown in Fig. 13, each member having a' laterally extending base-flange 32, by

which andscrews 33, said members are securelyfheld in position. Through the plate 12 underneath the space separating the elements 31, 31, there is an oblong opening 34, through which the cuttings or clippings resulting from the severing of the corrugated strip as it passes through the forming process, are dropped. At one side, the shearing element 31has a shoulder or offset 35, and on the opposing side of the shearing element 31 there is a similar offset 36, the for- V mer of, which is farther down from the upper margins of the elements 31, 31*, than the latter. And from these shoulders upwardly, the outer surfaces of these elements are beveled, as at 37.

The steel pads 19,19 are prevented from sidewise movement by being closely fitted between the walls 14, 14 and from lateral shifting by abutting at one end against the shearing elements 31, 31 and at the other ends against end plates 38, bolted against the ends of the vertical walls 14, 14*, by screws 39. 9

At the end of the shoe, opposite that having the bar 23, there is located a guard 40, including a stud 41,"upon which the guard is movably mounted, there being locking nuts 42, on said stud 41, to adjustably hold the guard in position. This guard 40 is a sheet metal plate bent to substantially U- shape,'the lower margin of which is elevated above the upper surface of the die to freely pass a. corrugated ribbon below this margin and above the die- pads 19, 19".

From the shoe there extend two or more pilot pins 43, which pins are very substantial hardened-steel rods, the object of which will be hereinafter described.

The punch B, shown in detail and detached, in Figs. 1 and 2, and )artly in Figs. 3, 13, and 14, comprises asu stantial casting or forging of proper length and width which has medially laterally extending flanges 44, and centrally projecting therefrom, a punch shank the shape or cross section of which corresponds to the opening in the plunger or slide of the press, and is in some cases round, in others square; and where the slide has flanges to which the punch can be bolted, this punch shank is frequently dispensed with. Near the ends of this punch there are sidewise extending lugs 46, which are cylindrically bored, as at 47, and these bores correspond in position to that of the pilot pins 43, and permit of a very close sliding fit of these pins in said bores ,47, to positively guide the punch into the die. This punch is longitudinally grooved with a rather deep groove 48; and in this groove there is permanently located a steel backing plate 49; and mounted upon this backing plate there are fixedly secured two steel pads 50, 50?, reaching from the ends of the punch to near the center thereof. These pads and the backing plate are securely held in position by a series of screws '51. Centrally of the punch, and secured to the backing plate 49, by screws 52, there is a shear-blade 53, having laterally extending flanges 54, wherewith, said screws 52, engage to hold the shearing blade 53 in proper position.

This shearing blade '53 enters the slot between the two shear elements 31, 31; and to properly guide this shearing blade into the slot, it has at its sides horns or leaders 56, which enter the slot in advance of the shearing blade, which latter has an oppositely inclined cutting edge 57 Fig. 14, to produce What is technically known as a drawing cut.

Near its outer end, there is in the punch-pad 50 a transverse slot 58 and in this slot there is movably located a pinch-bar 59, that is held in position by a screw 60, tapped into the pinch-bar and having its head slidably engaging a hole 61, drilled through the backing "plate and partly into the punch body, as clearly illustrated in Fig. 3. There are drilled through the pad 50, and partly into the punch body at each side of the screw 60, two holes 62, in which there are located coil springs 63, which hear at one end upon the heads of two pins 64, the ends of which pins bear, upon the punch-pad 59 to keep the same normally inoutwardly extended posi tion, as illustrated in Figs. 2 and 3.

At opposite ends, the fixed pads .50, 50,

of the punch have Shoulders 65, 66, which roll is passed underneath the guard 40, over the pad 19 in the die between the twobars 16, and slightly past the shearing members 31, 31 so that, when the punch-press slide has been caused to descend, the shear blade 53 will trim this end of the ribbon, and the die and punch will then correctly form that portion of the ribbon' whi-ch is at the right of the shearingelement. Nowthe ribbon pulled along until the trimmed end reaches the stop-block 25, and is held by the operator of the machine upon the gage-pad 26, when the operator steps upon the treadle of the press to. cause the machine to make one revolution, which will sever the. ribbon by cutting out, transversely, a small strip, the width of which is that of the shear blade, and as the punchdescends still farther, it will force the two die- pads 19, 19, downwardly until they bear upon the bed plate 12. This downward IIIOVQIDBDtCQUSGS the ribbon to receive its full impression. At the same time the end of theribbon adjacent the shearing member 31, will have its terminal first upwardly, and then horizontally lock-seam, while the end of theribbon adjacent the shearing member 31,.will first be bent horizontally, and then vertically, which formationwill be the female member of said lock-seam, so that when two members A are placed together as shown in Fig. 11, and-the end 72 of one member bent over the end 7 3 of the other member, and then the members 71, 7 2, 7 3, doubled upon themselves, the locking seam is completed. In practising this present invention, I perform this lock-seaming in a machine which forms the subject matter of an application for Letters Patent filed by me concurrent with the present one, and will not, therefore, be here described.

Attention is now directed to the fact that with this die and punch I am enabled to form strips of different lengths within the compass of the die. Thus let it be assumed that thepitch of the corrugations is 5}- of an inch, and that the die has 14 corrugations on show in the finishedarticle if the die :cachside of the shearing device. With the first stroke of the press, there are formed on the ribbon A at the right of the shearing the right thereof, anda sufficiency of ribbon to form the remaining 14} corrugations. The second stroke of the press cuts off the first completed strip, and trims the terminal of the ribbon and at the same time stamps 14: corrugations for. the second strip. Re-

peating these operations will now produce a completed strip with, every stroke of the machine. But if a shorter strip is desired, the stop-block 25 and the gage-pad 26 are moved toward the shearing element and properly adjusted, and when moved as far aspossible a strip can be formed that has but 18 corrugations, 14 of which will always be formed at the right of the shearing element and after the ribbon has been moved to the stop block, the remaining four corrugations will be formed at the left of the die, while at the same time 14 of these cor ruga'tions that have been formed atthe rightof the die will receive a second impression at theleft thereof, which, however, will not is accurately. made. i i n It is obvious that, inasmuch as the depth, or thickness of a radiator core varies between two and live or six inches, a separate die is required for everydifferent width, it beingimpossible, or at least impractical, to makea die and punch that is adjustable as to thewidth of the ribbon from which the core-units areto be made. a

I have already mentioned that between the corrugations there are a series of approximately semicircular projections 21. These projections are rather difficultto form correctly in the die-pads and would require the most skillful mechanic to produce, and a longtime to accomplish. Iovercome this objection in the following manner:

1 '11 form. each diepad 19, 19 of three longitudinal bars 80, 81, and 82, of proper width and thickness, as shown in Figs. 4%, 7, 8, and then shape the side bars 80, 82, to form the approximately semi-hexagonal corrugations In the middle, and widest bar 81, I mill in a milling machine, or in a shaper, with suitable tools, three (more or less) grooves, and insert in these grooves steel bars 83, the upper edges of which are approximately semicircular, and then securely fasten thethree bars) 80, S1, and 82 by means of a sufiiciency of screws 8d, as shown in Figs. 3, 9, and 10. The counter part of these semicircular projections in the punch-pads are grooves, which are readily in an obvious same securely to the die-pad 19*, so that shifting of the ribbon cannot take place when the press starts its operation, which, owing to the jar caused by the clutch mechanism of the machine when thrown into gear,

.might take place and thereby produce defective work. 7

I have hereinbefore described this device as applied to core-unitshaving the peculiar formation set forth in the Letters Patent aforesaid, but it is evident that by modifying the impressions in die and punch-pads, core-units of different construction can be produced by my invention.

I have hereinbefore described the preferred embodiment of my invention, but I desire it to be understood that I am aware that changes may be made therein, and parts omitted without departing from the scope of my invention as defined in the appended claims; 7

Having thus fully described this invention, I claim 1. Means for forming the elements'of' coreunits for radiators, comprising a die bed, a shearing element medially of said die bed, vertically movable resilient forming pads in said die bed at each side of said shearing element, a stop-block at one end of said die bed, apunch proper, including a main body, a shearing member medially of said main body, forming pads at each side of said shearing member and fixed to' said main body, there being in one of said form- 7 ing pads-a resilient pinch block normally extending beyond the cutting edge of said shearing blade.

2. Means for forming an element or member of a core-unit for radiators, comprising a die proper, said die-including a bed-plate, two vertically disposed longitudinal walls rising from said plate in parallel spaced relationship, bars upon said longitudinal walls, said bars having longitudinal offsets or shoulders, end-plates for closing the space between said Walls, counterbores in the said bed plate between said walls, a shearing die medially of said bed plate, a forming pad on each side of said shearing die, said forming pads being normally sustained in elevated position and bearing at their upper surfaces against said shoulders, springs in said counterbores and bearing against said forming pads, and a punch proper constructed to operate in conjunction with the aforesaid die proper.

3. Means for forming members of a coreunit for radiators, comprising a die proper,

pads for movably supporting said pads, a.

guard at one end of said bed plate, a bar at the other end of said bed plate, a movable stop-block on said bar, and a punch proper constructed to operate in conjunction with the aforesaid die proper.

I. In adie proper for forming nwnrbors of a core-unit for radiators, a bed plate, vertically movable die pads on said bed plate, and a punch constructed to operate in conjunction with said die proper, said pads comprising two narrow, longitudinal side bars and a wide center bar, there being in said center bar a series of longitudinal grooves, and bars in said'grooves, the upper edges of said latter bars being approximately semicircular, all of said bars being securely united.

5. In means for forming members of a core-unit for radiators, a die proper, and a punch proper constructed to operate in conjunction with said die proper, said punch comprising a main body, said main body being longitudinally grooved, a backing plate in said groove, a shear blade medially of, and transversely to, said backing plate, said shear blade being removably secured to said backing blade, a punch pad at each side of said shear blade, said punch pads being screw-fastened to said main body,'there being near the outer end of one of said punch pads a transverse groove, a movable bar in said groove, a screw for holding said bar in projected position, push pins at the sides of said screw and bearing upon said movable bar, and springs bearing upon said push pins, there being on said die a shearing element constructed to cooperate with said shear blade, and beyond the movable bar in said punch a stop, said stop being adjustable to vary the distance between said stop and said shearing element.

6. Means for forming members of a coreunit having a seam-lock for radiators, comprising a die and a coacting punch, means in said die and punch for forming corrugations in a continuous strip of sheet metal placed over said die, means medially of said die and punch for severing said strip at predetermined points, and means in said die and punch at the sides of said severing unit member has formed at one end the female element, and at the other end the male element of said seam-lock, so that when two of said core-unit members are placed in spaced apart relationship, they are capable of being locked together by said seam-lock elements.

7. Means for forming members of a coreunit having a seam-lock for radiators, comprising a die proper of a length exceeding that of a member of said core-unit, said die having medially of its length a shearing die and adjacent said shearing die vertically movable pads said shearing die comprising two members in spaced apart relationship, one of said shearing members having a shoulder located a predetermined distance below the shearing edge, a straight vertical portion, and an inclined portion terminating at the cutting edge of said shearing member, the other of said shearing members having a shoulder and an inclined portion terminating at the cutting edge of said second shearing member, the latter shoulder being nearer to the cutting edges of said shearing men'rbers than the former shoulder, and a punch constructed to cooperate with said die, whereby a ribbon oi sheet metal placed on said die is severed by said shearing die and punch and at the same time there is formed 011 each severed strip, at one end thereof a female part of the seamlock, and at the other end a male part of said seam-lock.

In testimony that I claim the foregoing as my invention, I have hereunto set my hand.

CHARLES F. SPERY.

Uopies of this patent may be obtained for time cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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