US2325369A - Apparatus for making tubs - Google Patents

Description

uly 27, 1943. R. MA cHEsNEY APPARATUS FOR MAKING TUBS Original Filed Aug. 15, 1941 2 Sheets-Sheet l July 27, 1943- R. M. cHr-:sNEY

I APPARATUS FOR MAKING TUBS original Filed Aug. 15, 1941 2 Sheets-SheetY 2 Fig. a

Fig.

I J mo MLM applcationerial No. 406,992', nledAugus `1213441, for Method and apparatusor nakiiigV .ferent lengths hy Weldingbellfendfb'lanksof blanks is .accomplished by mak-ingthewfbellwith different bottornslopesso; that, des@U `.difference between their lengths, they all have Patented July 27, 1943 RQbertfM. onesiey; Alliaoe, ohio, assigner to Y `The steel YSwmitary Company, Amante fome,

-av corporation This invention relates@ the manufaeure o 'f- .tubs and, more partioula/rh( toappa'ratii's o ,Rodman Patent No, 2,135,877,

ferent sizes to 4icle'ntioal drainfe-riolblanksAl essential that the depth of all the` bell-endblanks .at the .openrend thelgeofafter trimmin stantially Aidentical to the depth Q fjth drainend tef .die

.the san-ie depth lat their open end Iheimethod disclosed in said patent requires afpunch recinroeable througha `die and., havingjon lil'eneth;

seriesof diierent Vvholstein shoes attaehed ev to, cooperating with one of a series -Qnrenne pads. I haYeinventedanoVel method and-apparatus for makingqbel-end blanks odiilerent lengths but of the samedepth at ,their openend when trmmedwhereby yI avoid-the neoessitypf employing a series of removable shoesQon he In a preferred embodiment.end-:practice of. ne invention, I use the-same punch, .pressur pad and die nine .t0 forml @Series 0f bell-'Emblems Varying in length. I obtain thedesiredidentny ofthe depths of the blanks of thesevzafllnneths at their open end by appropriatelycontrolling the stroke of the punch, Whioh, or course, determines the depth of 4the resulting blank. .Ifvary the effective `lengths of Vthe punofh for zthevldfiifer Ient sizes of 4blanks by. securing blocks in aV recess inthe bottom ofthe p'unoh.. 'hese hloeksfhave a Vbottom face which slopes downtival?dl-y' on the same angle as .the bottomof ,therpunchfand thus vforrn a continuation 'for .extnsonltherefl. .I

blank is drawn, at A theloottorn 'ofthe open end of the blank, to limit the iio'w of metal-longitudinnlly from .Said end between the nlnln and Pres'- surepa'd'.Y 'L l l Eurther details'and `I iJ/iel features of the invention will yloeo'nne apparent during the followingCompletedesrptioh and explanation which Yrefer to" .th .annmpnnying mening'. ,illustrating the preferred-.embodiment and nfnnnne.- In 'the drawings: A

-..Figure ,1, is a longitudine-'1 yer'oajl section thr'oughth'e Ydie equjpih tvjfor 'drawing bell'een'd tub .blanks 'ofi length?. L Figure ,2 i's @,'Snnilnrvview Showing the onnip- .nxonnce a none of ,intermedi- Figure 3 is a siinilarf'new Vshowingthe equipment asset `up for drawing a h lank of maxnum Figur@4 n; is @menomato View snowing Anu@ trate the jdifferene "b 'fetweentheir lengths and ing; the several sizesgof 'tubs which jeanV oemade .is is'supponedlo ,blocks iswh'ich .rest 'a foon- ,dation :IBL Y The die 1 3 4has. an elongated .opening therein, the edges ,of .which afreroude'das shown, Whereand the bottom ofthe punch sloping downwardly #toward the other ondas shown at i9.

-Alpres'surefpad 29 is harriedoh apiston 2l refiDifCat-lg 1in a Cylinder (not ShOWn) against nuidnunder pressure. .fine pas 2a .has its upper fa'oe sloping] downwardly -s at 22, and curved adapted to peeive the bottom vof the me blank 2i! and co-operates with a hardened plate 24 secured to the punch I2 at the inner end of a notch or recessed portion 25 in the bottom of the punch, to bend up the edge of the sheet Il at the bottom of the openV end of the blank as indicated at 26. This bent-up portion resists iiow of the stock longitudinally between the punch and pad as the latter descend together.

In the operation of the apparatus described i above, both the heads I0 and II are initially retracted and a ilat steel sheet 4of proper size is laid on the die ring I3. The press is then operated to lower the head I0 andthe blank holder ring I4. The latter engages the sheet margins and restrains them against excessive iiowas theV central portion of the sheet `is deformedby the punch. After the sheet II has been gripped by the lng I4, the pad 29 is raised by controlling the fluid in the cylinder in which the piston 2| reciprocates. The upward movement of the pis- .tonl is limited as by Ta mechanical stop, so that the extremeuppermost position fof the', pad 20 isrdslightlyj below the undeformed flat sheet'of steel.

The press is next operated to cause the lowering of the head II and the punch I2. The bottom of the punch immediately starts to deform the sheet andthe latter is thereby forced into engagement with the pad 20. The edge of the sheet is bent up by. the co-action of the block 23 is uiustrated. in Figure 5 where a nnished beuend blank 21 is shown associated with a drainend blank 23. These blanks are adapted to be formed into a complete'tub body by welding them 1 together along the joint 29. `To accomplish this welding satisfactorily, it 'obviously necessary that the depth of thel blanksjat their' point of abutment be substantially identical;- Asl illustrated in the drawings, the bell-end blankmade by the die 'equipmentjshown inFigure A1 is that lior the'shortest tub, i. fe., that shown complete in Figure 5.. l Y

When it is desired to make a bell-end blank for a longer tub Vsuch, asthat shown inFigure 6,

the equipment already described is modied by moving the iiller block 23 to a position indicated at23'iin Figure 2 and by attaching a block 30 to the punch I2' in abutment with the plate 24.

.'Ihe block 30 constitutes a'continuation of the punch, its bottom facemhaving the sameV slope.

as the bottom of the punch. The equipment as shown in Figure Zoperates in exactly the same manner as described above, except that a larger sheet of stock is employed to produce a bell-end blank 3 I of intermediate length;

In order that theblank V3I have a depth at its open end the same as that of the bell-end blank 23, so that identical drain-end blanks maybe welded to all of thedifferentlengths of bell-end blanks, the stroke of-the punch I2. is reduced somewhat by appropriate adjustments Hwhen drawing bell-end blanks of intermediate-length. In other words, the punch I2 and-pad 20 donot they do whenmaking the blanks 27. V'Ihe'dilerence between the strokes of the press under the two diierent conditions is illustrated at 32 in Figure 2. By this arrangement the blank 3|, although it has the same bottom slope as the blank 21 and is materially longer than the latter, has a depth at its open end` precisely the same as that of the blank 2l. This is clearly shown in Figl Similarly, when it is desired to make a bellend blank of still greater length, I replace the block 30 by a block 33, and remove the iiller block 23. With this set up, the edge of the steel sheet adjacent the open end of the blank is bent up as at 34-by the co-operation of the block 33 with the die ring I3. The operation of the die equipment shown in Figure 3 is the same as that which has been described above except that the stroke of the press is again decreased slightly, as indicated at 35. The resulting blank 3E is thus shaped to the same bottom slope asthe shorter blanks 'but has the same depth as the latter at its lopen end. The bottom slopes of the blanks of the various lengths are indicated by the angle a in Figures 5 through 9, and this angle is the same in all cases. As previously stated, Figure e clearly shows that the several sizes of bell-'end blanks,` though having the same' bottom slope but diierent lengths, lhave the same depth d et their open ends. The progressive decrease in the stroke of the punch with the increase in the length of the blank means that the depth of the longer' blanks adjacent the closed vend thereof is somewhat less than that of the shorter blanks, but this difference is rather slight,V e. g., approximately 1/4 or less, so this difference is not obd jectionable.

It will be apparent lfrom the foregoing description and explanation that by my invention I am Vable to produce tubs of various lengths by welding together sheet-steel stampingsof different sizes produced on'the same set of Vdie equipment, the only change necessary being the attachment of the blocks 30 or 33 in the case of the Vtwo longer blanks and theA adjustment'of the filler block 23. These parts and the manipulation thereof are quite simple. The blocks 30 and 33 serve merely to` increase the eiective length of the bottom of thefpunch whereby it is adapted to work on sheets of longer length. It will be apparent that the 'bell-end blanks of different sizes produced according to `my invention have the same bottom slope, since they are all formed by the same punch and pad, and the blocks 30 and 33 have the same slope on the bottom face as the bottom of the punch. The identity between the depths of the several lengths of blanks at their openends is obtained simply by controlling the stroke of the punch, i. e., by reducing the stroke slightly `for the blanks of the longer lengths. All the different sizes of blanks are thus suitable after trimming, for welding to identical end blanks to form completeY tub bodies in a range of over-all'lengths, e. g., 4% feet, 5, and 5l/gieet." l

vIt will further be apparent that the invention is a marked improvement over the disclosure or Rodman Patent No. 2,114,150 in that removable shoes having diierent lengths, adapted to be secured to the punch, and diierent pressure pads, are not required for the several sizes of blanks.

Although I have illustrated'A and described a preferred embodiment of my invention it will be understood that; changes in the procedure and construction of the apparatus may be made withn @out departing from the spirit of the invention or the scope of the appended claim.

t bathtubs `I claim:

Apparatus for makingbell-end blanks ofsevg: 1`

eral diierent lengths for the manufacture of infa range of sizes, comprising` a die ring having an ,elongated opening therein rounded at one end, an elongated punch reciprocable therethrough also rounded at yone f end, a blank-holderring adapted to engage a metal sheet kon said die ring,thepunch having' 'l a continuous rounded bottom surface adapted rounded end toward the other end, said other end of the punch beingoiset from said surface tol l the full length of the bottoms of blanks of vari- 10' form a recess, adjacent the en d of said surface,

a. block removablyrpositioned in said recess and detachably secured to said punch, said block'extending longitudinally of said surface a sufficient recess.

distance to `shape the additional bottom area of lthe klonger lengths of blanks and having its bottom sloping at the same angle as said surface, a

single compression pad below said punch having a surface complementaryin shape to said first- `mentioned surface and extending from the round-v edend of the punch to theother endoverlapping said recess, and thereby beingadapted to forni ous lengths, i. e., when lsaid block is attached to the punch or when it is removed, and a ller block positioned on said pad to bend up the end of the sheet asthe punch descends into engagement with said pad, and means for detachably securing said filler block to the pad both in a position adjacent the inner end of said recess and in a position adjacent the outer end of the rst-rnentioned block when the latter is positioned in said ROBERT M. CHESNEY.

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