US1597206A

US1597206A - Method of producing expansible-collapsible elements

Info

Publication number: US1597206A
Application number: US368116A
Authority: US
Inventors: Harry C Mallory
Original assignee: American Radiator Co
Current assignee: American Radiator Co
Priority date: 1920-03-23
Filing date: 1920-03-23
Publication date: 1926-08-24
Anticipated expiration: 1943-08-24

Description

Aug. 24 1926. 1,597,206

H. c. MALLORY METHOD OF PRODUCING EXPANSIBLE COLLAPSIBLE ELEMENTS Filed March 25, 1920 2 Sheets-She a"v 1 vwon fez W 6ml Aug. 24, 1926. 1,597,206

H. c. MALLORY METHOD OF PRODUCING EXPANSIBLE COLLAPSIBLE ELEMENTS Filed March 25, 1920 2 Sheets-Sheet 2 amvcm-foz 67cm @mw gafiadm w A TTORNEY Patented Aug. '24, 1926.

UNITED STATES PATENT ,IIOOFFICE.

HARRY C. MALLORY, OF BELLEPOR'I, NEW YORK,

ASSIGrNOR, IBY' MESNE ASSIGNMENTS,

170 AMERICAN RADIATOR gomrANY, or NEW YORK, N. Y.,' A coRroaArIo'n or NEW mnsrnn Application filed March 23, 1920. Serial No. 368,116.

M y invention relates to. improvements, in methods of producing expansible-collapsible elements, and the same has for its object more particularly to provide a method of producing corrugations in a hollow cylin-' drical or tubular blank, which method 'consists in drawing the wall of said blank over suitable dies, whereby the shape thereof is altered without subjecting said wall to anyrolling or swaging action.

Further, said invention has for its object to provide'a method of corrugating a hollow cylindrical or tubular blank which consists in securing the blank at one end to a suitable sup ort, and then subjecting it to the action 0? appropriate dies, beginning adjacent to the secured end, and working progressively outwardly therefrom and drawing the metal of'the wall from its free end over or between said dies towards its -&cured end into corrugations or folds ofsubstantiallyuniform temper throughout. Further, said invention has for .its object.

to provide a method of producing corrugations in a hollow cylindrical or tubular blank one end of which is firmly secured to a support in which the wall of the blank, proceeding from said secured end towards its free end, is passed over appropriate dies,

7 in such aamanner that the metal'of the-wall is drawn inwardly from the free end'of said blank towards its secured end to produce a.

series of shallow corrugations, after which the blank is subjected successively to other 'dies in order to progressively deepen and contract said corrugations.

Further said invention has for its object to provide a method of corrugating ahollow 40 icylindrical blank, in which the wall of the lank is initially drawn over substantially the entire efi'ective surface of one member of a set of cooperating dies, and over a part of the effective surface of the remaining member or members of said dies in order to produceshallow corrugations extending approximately an equal distance inside and outside of the original wall line or diameter of the blank, which corrugations are thereafter drawn, in succession, over or between additional dies serving to deepen and contract said corrugations by reducing thev ra; dins of the curved inner and outer bends of said corrugations and forming intermediate portionstconnecting the ends of said curved bends.

Other objects will in part beobvious, and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends-my invention consists in the successive steps or operations hereinafter described and then pointed out in' the claims.

In the accompanying drawings forming part of this specification wherein like characters of reference indicate like parts, I have illustrated the first, last and several of .the intermediate steps or operations performed in carrying out my method, and in connec- .tion therewith the essential parts of a ma- Fig. 4, is a similar view showing the final drawing operation in which the corrugations are deepened and contracted to the desired extent;

.Fig. 5, is an enlarged detailside view showing. a set of dies for drawing-the corrugations, showing the manner in which a portion of the wall of a blank is. drawn over approximately the entire effective surface of the upper die, andover approximately one quarter of the effective surface of each of the .cooperating lower dies, and

Fig. 6, is a diagrammatic view showing the development of a corrugation from the blank to the completed corrugation in seven successive drawing operations.

To produce a corrugated element, for use as an expansible-collapsible vessel, I take a hollow, cylindrical blank 12 of appropriate thickness, by preference one that is open at one 'end, as 13, and closedat the other 14. The blank is then secured at its closed end 14 in a chuck 10 which is freely revoluble 1 are placed in operation, rotating towards each other, and are brought together with the wall of the blank 12 therebetween. As soon as the wall of'the blank becomes 1 engaged by said rotating

dies

15, 15*, the blank and the chuck 10 supporting the same, will be caused. to rotate by the frictional engagement of the

dies

15, 15 with said wall. and

the'metal thereof will be drawn slightly inwardly from the free end 13 of said blank towards its closed end 14, and a very shalv repeated-until the desired number of corru-- low. circumferential corrugation 12 formed therein adjacent to its closed end 14. Upon completing said-first shallow corrugation,

the

dies

15, 15 are separated again and "moved outwardly. a step, towards the open 'end 13 of the blank, and then brought together again into engagement with the wall of theblank, and a corresponding second shallow corrugation 12. This operation is gations or bends have been produced in the blank.

Hereu'pon the partly corrugated blank is subjected to the second step or operation, as lllustrated at Fig. 2, in which the dies are reversed, i. e. the upper die 17 being a large.

single one, and the lower die 17 being a small, double one whose members are separatedfrom each other by a distance equal to the width of the upper die 17, plus double the thickness of the metal of the wall of the blankand the requisite clearance, In this second operation the corrugations are successively deepened intosemi-circular, or substantially semi-circular folds extendmg approximately an \equal distance within and without the original diameter of the blanks. The

dies

17, 17 used in this operation are oi substantially the same diameter as those used in the first operation, but are appreciably narrower in width.

succeeding operation, however, not

necessarily the third, is illustrated at Fig. 3.

In this operation the dies are again reversed, and the upper die 18 formed as a double one, and the lower, smaller die 18 as a single one. The dies in this instance are also of the same diameter as in the preceding-constructions,-but appreciably narrower in ,-width than those shown at Fig. 2, and serve to deepen the corrugations somewhat further and bring the same more closelytogether.

The final operation is illustrated at Fig. 4 In the regular course of operation, several operations may'occur between the operation illustrated at Fig. 3, and that shownat Fig. 4. In said last named figure, the

dies 19, 19 are reversed, and the upper die 19 formed as a single die, and the lower die 19 as a double one. The

dies

19, 19 are, as heretofore, of the same diameter but materially thinner in width. In this final operation the corrugations, as previously developed, are further deepened and contracted to the degree desired in the finished product.

In each of the sets of dies hereinabove described the distance between the inner opposi'ng faces of the double dies is always about equal to the .widthof-the single die plus double the thickness ofthe metal of the wall of the blank to be operated upon, sufficient clearance being provided in each case to insure the proper drawing of the metal of the wall over and between said dies.

At Fig. 5 the operation illustrated and. described in connection with Fig. 2, is represented on an enlarged scale in order to show graphicallylthe manner in which the wall of the blank is acted upon by the dies. In

Fig. 5 the blank is shown with .the firstpartly-drawn corrugation 12 formed adja-.

' ing the metal 0 the wall of the blank inwardly from the free end13-of the blank, as indicated by arrows a, over and between 'theefiective surfaces of said dies and conformin the wall of the blank thereto.

At ig. 6 I hav shown diagrammatically the development of one corrugation from ,the origin corrugation resulting from the operation of a series of seven sets of dies acting in succession upon the'wall of the blank. In this figure, the successive operations are illustrated by a series of curved lines indicated by the letters a to g inclusive.

blank to the completed' 1 It will be understood of course, that be- 7 tween the initia and final drawing opera-" tions as illustrated at Figs. 1 and 4, respectively, any desired number of intermedlate drawing operations maybe performed. I

' have as a matter'of convenience shown only ,-four operations to illustrate my method.

' It is to be hoted particularly that in car-. rying out my method I prefer tosecure one end of the blank firmly-invposition upon the chuck 10 which, while capable of free rotary movement, is preferably held against all longitudinal movement, and that in 1 corrugati-ng the wall of the blank I prefer to begin the operation at or adjacent to the fixed end of the blank, and progressively work outwardly towards the free end of the blank until the desired number of corrugations have been produced and .that as a result of the construction and disposition of the dies with reference to each other, the

metalbf the wall of the shell between the.

dies and the open, free end of the blank will be. progressively drawn inwardly towards, over and between said dies in the formation of the corrugations thereby. This action'is due to the fact that the wall of the .5 blank between the die and the free end of the blank being unconfined or unrestrained will offer less resistance to the drawing action of the dies than the closedend of the blank or the corrugated portion of the 10. blank between said dies and said closed end, and will cause the metal of the blank-to be drawn inwardly over and between said dies and thus insure the uniform temper of the metal.

I claim and desire to secure by Letters Ifatent is:- 1. The method of expansible-collapsible elements which consist's in taking a cylindrical blank, securing one end 0t said'blank to a support, subjecting the said blank to the action of suitable l dies and suc'cessively drawing the same over saiddies from the free end of said blank towards its 'secured end to form a series of shallow, parallel corrugations therein, and

then subJcting said, b ank to the 'further action oi said dies whereby'to progressively. deepen said corru ations and draw the same 0 closer together, su stantially'as specified.

(,2. The method of roducing corrugated expansible elements w ich consists in taking a hollow, cylindrical blank, securin one e d 1 of said blank to a suppo .subj ting said blank to the action of suita e and successively drawin the same over said dies from the free end 0 said blank'towards its secured end and initially formin shallow circumferential corrugations t erein,

and then subjecting said partially corru-" gated structure to the action of additional sets of dies whereby furtherto draw Said blank from its free end towards its secured end and progressively to deepen and contract said corrugations, substantially as specified, Thfrnethod of roducing expansiblecollapsible elements w ich conslsts 1n takin a hollow cylindrical blank, open at one end and closed at its blank at its closed end tb a revoluble support, subjecting said blank to the action of.

a set of cooperating revolving dies, while upon said support, beginnin adjacent to its 5 closed end, arid. drawing 1: e wall of said blank over and between said dies, from the free open-end of said blank towards its closed fixed end whereb toform corrugationstherein, substantia l asl'specified.

4. Themethod of re ucing 'expansiblecollapsible elements w ich consists in taking a hollow, cylindrical blank having an open end and a closed-end, securing said blank at its closed end to a revoluble a hollow Having thus described my invention, what i of said, blank towards its free, producing corrugated- -wards its closed, secured end, over and becollapsible elements ies of dies tions in said wall,

tract other end, securing said,

support, 'sub- 66 ectmg said blank, wh1leon said support, to

revolving wall, substantially as specified.

5. The method of producing expansible collapsible elements which consists in taking cylindrical blank having an open end and a closed end, securing said blank at its closed end to a revoluble support, subjecting said blank, while on said support, to the action of a set of cooperating, revolving dies, and, proceeding from the closed, secured end open end, said blank thereof todrawing the metal of the'wall of inwardly, from the free open end 86 tween said dies and initially forming shal ow corrugations in said wall, and then subjecting said blank successively to the action of other sets of dies which serve to draw the metal ofthe wall of said blank further inwardly towards its closed end and to deepen and contract said corrugations, substantially as specified.

' 6. The method of producing 'expansiblewhich consists in taking a hollow cylindrical shell having an open end and aclosed end, securing said blank at its closed end to a revoluble support, subjecting said blank, while on said support, to the action of a set of cooperating revolving dies, and, proceeding from the closed, secured end of said blank towards its free, open end, drawing the metal of the wall of said blank with a step-by-step movement inwardly from the free, open end thereof towards its closed, secured end, over andbetween said dies and initially. forming shallow corrugaand then subjecting said blank successivel to the action of other sets of revolving dies which serve to draw the metal of the wall ofsaid blank further inwardly and progressively de'epen and consaid corrugations, substantially as Specified. Y 7. The method of producing expansiblecollapsible. elements which consists in taking a hollow cylindrical shell having an open end andpa closed end,'securing said blank at its closed end to a revoluble support, subjecting said blank, while on said support to the action of a set of cooperating, revolvm dies, and, proceeding from the secured en of said blank towards its free end, drawing the metal of the wallof said blank progressively inwardly from said free endtowards said secured end and initially forming shallow corrugationsin said wall, and then subjecting said blank successively to the action of other sets of revolving dies of gradually diminishing width which serve to draw the metal of the wall of said blank further in-. wardly towards its closed end and progressively reducing the diameter of the curve inner and outer ends of said corrugations and forming substantially flat, parallel porblank to the action of suitable dies and successively drawing the same over said dies from the freeend'of said blank towards its secured en 9..The method of producing corrugated ,expansible-eollapsible elements which conwhereby to form corrugations therein, substantially as specified.

same at one end to a support, subjecting said (1 blank to the action of suit-able dies and successivelydrawing the same over said dies from the free end of said blank towards its secured end to form a series of shallow, par? allel corrugations therein, and then subjecting said blank to further action of dies whereby to deepen said corrugations and draw the same closer together; all of the said several corrugating operations proceeding from the secured end of said blank towards the free end thereof, substantially as specified.

Signed at the city of Manhattan, New

of New York, borough York County, in the State of New York,'this 28th day of Febru-' ary, one thousand nine hundred and twenty.

' HARRYC. MALLORY.