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Aug. 13, 1946. ‘ H, V_IDETTMAN 2,405,738 DIE MACHINE FOR PROGRESSIVE SHEET METAL FORMING Filed OQt. 28, 1942‘ Sheets-Sheet l 2 OF O O_. _o_ I VH|:4.;-| l o_J‘I 1,-#1.M 1I.l 9 Q mm M1. w» v 0NV MA w. w N, Aug. 13, 1946. H. v. DETTMAN DIE MACHINE FOR PROGRESSIVE SHEET METAL FORMING‘ Filed Oct. 28, 1942 2,405,738 4 sheets-sheet 3 INVENTOR HAROLD V.DETTMAN AT TORNEYS 1946. HVYEbiE-TTMAN DIE MACHINE FOR PROIGRE‘SS-IVEYSHEET METAL FORMING ' > 2,405,738 Filedloct. 28, 1942 ‘4 Sheets-sheaf, NTOR ' - ' Patented Aug. 13,1946 ,. 2,405,738 UNITED STATES PATENT OFFICE 2,405,738 DIE MACHINE FOR PROGRESSIVE SHEET METAL FORMING. Harold v. Dettman, Riverside, 111. Application October 28, 1942, Serial No.463,586 2 Claims. 1 (01. 153-41), : My invention has for its object to provide a simple, economical and effective machine for . 2 a feeding the metal sheet in step by step time move folding sheet metal or the edges of sheet metal men plates, whereby the same may be utilized for in terlocking seam units between the plates. Another object of my invention’ is to provide a machine having reciprocative jaws carrying male . ' Figure 6 is a still further‘modi?ed form of my forming machine wherein companion pairs of cranks impart reciprocative movement to the jaws followed by a horizontal feed movement of said Jaws. and female articulated dies, whereby a fold or seam element is progressively developed through Figure "7 is a fragmentary plan view of the a series of biting or stamping movements of the jaws, combined with a relative movement between the sheet to be stamped and said machine, where by the successive steps to complete the seam ele ment are effected. . the stamping movement of the jaws and for same. . FiguresB to 13 inclusive illustrate modi?ed sectional views of the seam forming dies wherein ‘ the metal is shown progressively from itsinitial ‘ Another important object of my invention is to provide the die carrying stamping jaws with 15 die step to its ?nal die forming step. eccentric power means, whereby the jaws will pleted double seam between sheets of metal which progressively form a seam element on the edge of a sheet and provide a relative feed movement, may be formed by my apparatus. between the jaws and sheet following each stamping movement. ‘ Figure 14 is a sectional view through a com I > Figure '15 is a sectional view of another pos sible form of seam wherein theinterlocking edges 20 are simply in U form. _ Figure 16 is another sectional view of a pos A further object of my invention is to provide sible seam v‘wherein the sheet metal plates are eccentric actuating means fOr the stamping jaws, positioned at right angles to each other and whereby said eccentrics will impart a combined locked by a seam. stamping and feeding movement for the sheet 25 Figure 17 is a diagrammatic view of a modi?ed ~ metal Worked upon. form of fold or crimp at the edge of a sheet metal A further object of my invention is to provide plate. the relative reciprocative jaws with a lineal die Figure 18 is a plan View of the same. for each jaw of the male and female type, wherein the lineal dies are gradually formed in 80 Figure 19 is a diagrammatic modi?ed form of a plurality of changing contours from the initial my invention wherein a sheet of metal curved or in drum formation may be provided, with edge Or ?rst die unit, to the completing or last die unit, seams in accordance with my invention. _ whereby the sheet of metal, as it travels between Referring by characters to the drawings i and the dies in a succession of stamping movements, 2 represent upper and lower companion drive will progressively complete the seam element. shafts geared to a power shaft 3 whereby the com~ With the above and other minor objects in view, panion shafts are rotated in synchrony. The the invention consists in certain peculiarities of drive shafts are mounted in a suitable frame and construction and combination of parts as will be as best shown in Figures 1 and 2 they terminate fully set forth hereinafter with reference to the accompanying drawings and subsequently with eccentric ends 4-4 and 5-5 respectively. claimed. . Mounted upon the companion eccentrics is an In the drawings: upper die bed 6 and a lower die bed ‘i which die beds carry a series of male and female dies ,8 Figure 1 represents a sectional elevation of a and 9 progressively developing a seam element forming machine embodying the features of my invention. 45. from the ?rst die to the ?nishing die in the series. The frame, as shown,‘ may be provided witha Figure 2 is a plan view of the same with parts table 8' for the support of a sheet of metal A, broken away and in section. the edges of which are adapted to be folded to ef~ Figure 3 is a sectional end view of said ma chine, the section being indicated by line 3-3 of Figure 1. Figure 4 is a side elevation with parts in sec tion illustrating a modi?ed form of machine for folding the edges of sheet metal. Figure 5 is another modi?ed form of the ma chinewherein independent means is utilized for 55 feet a seam element as said edges pass through the stamping machine. As indicated in Figure 3 of the drawings, the metal sheet A may in some instances be guided top and bottom by rollers B extending from the frame of the machine. I The above described simple exempli?cation of my machine will operate asrfollows and may be‘ ' 2,405,738 3 best understood by referring to the diagrammatic tion of the cranks in the direction of the arrows, , said die beds will be caused to articulate and form the ?rst step in the seam. The next quarter of the revolution of the cranks will cause the beds, in their biting union to move and feed the views Figures 8 to 13. The thin metal sheet is ?rst fed under the initial die element in straight form at the time when the eccentrics have opened up the die beds, as the eccentrics close the die beds, a short sec sheet forward the length of the die operation, the next quarter movement of the cranks will tion of the sheet edge will be stamped with slight offsets which are primary and initially intended to form a seam and hence as the die beds are rapidly rotated by the eccentrics in the direction 10 cause the upper die beds to lift and disengage the metal worked upon and upon such disengage ment, the cranks I‘! will complete the cycle by a of the arrows, this vibratory movement causes a sheet of metal to be fed forward slightly at the point of biting of the dies and when the dies are» opened they will vibrate backwardly and “take another bite of the material and so forth until the complete fold is affected, by the movable series of progressive male and female dies as shown in the Figures 8 to 13 referred to. In these diagrams the fold is shown, as what might be termed a double lock seam, and when - completed the other sheet seam element, will be interlocked as shown in Figure 14. In other words, the interlocked sheet may be a seam wherein two sheets of metal are secured upon a ?at plane or one of the sheets maybe at a right angle to its companion sheet. 4 wardly and upon the next quarter of the revolu Referring to Figures 15 and 16 of the drawings a single seam is shown completed, which can be readily formed by providing the proper movable die bed. Figures 17 and 18 show a modi?ed form of a _ sheet of metal subjected to dies to produce a corrugated edge, it being understood that these progressive dies may be formed in a single sheet or in blocks suitably attached‘to the die beds. While I have shown and described the sheets and dies arranged to be mounted in“ ?at forma tion, it is understood that the edges of such sheets may be curved or in cylindrical form in place of rearward reciprocative ?nal movement, for the next bite of the sheet metal edge. The above exempli?cation of my invention i1 lustrates simply another form of utilizing the bite between the male and female die members for feeding the sheet, step by step to be seamed. Referring now to Figure 5 of the drawings a still further modi?ed form of my invention is exempli?ed, wherein I employ one cam controlled means for causing the bite or stamping action between the mold members and an independent means for feeding the sheet of metal step by step as it is worked upon by the reciprocative mold. In this instance, the upper pair of drive shafts l-—| have mounted thereon armed eccentrics 18 connected by a link l9. A roller 15’ extending from the front end of the link 19, engages a double track cam 20 suitably mounted upon the drive shaft 2| revolvable in bearing with which the frame is provided. The upper bed 22, carry ing the die formations is held in its open position by counter balance springs 23 engaging ‘guide dowels 24 which serve to hold the die bed in a vertical reciprocative action, The lower die bed 25 is ?xed and may constitute part of the ma chine frame. ' I The sheet of metal A in this instance is fed between upper and lower gripping jaws 26, linked the flat, in which case the die beds and dies would to an oscillating lever 21, The lower end of the be curved to conform to the drum metal operated 40 lever 21 is connected to a similar lever 28 pivoted upon as indicated in Figure 19. at the opposite end of the machine frame and the From the foregoing description it will be noted upper end of this last mentioned lever has a roller that the slight eccentrics are to be driven at a 29 which also engages the double cam track 20. very high speed and the same will cause a rapid When the parts are in the position shown in Fig vibration in a forward direction to feed the mate ure 5, upon further, rotation of the cam wheel the rial and said feeding stroke is quite short, hence sheet feed mechanism will move the sheet A one the progressive die formation, from end to end step forward followed by a die stamping operation of the series, would increase in a ?owing manner through movement of the lever cams l8, caused by or progressively corresponding to the short feed outward travel of the roller l9’ carried by the distance of the dies. link i9 to the outer surface of said cam wheel 20. In some instances it may be desirable to in Hence, we have demonstrated that means may be crease the speed of the seaming operation and provided for independently feeding the sheet of this can be done by increasing the distance of the metal to be worked upon, It will also be apparent feed of the sheet between each die stamping op that I may utilize stripper ?ngers X, which will for example Figure '4' of the drawings extend through the lower bed, and are carried by eration, illustrates upper and lower die beds l0 and H. the reciprocative upper bed 22, whereby the sheet The lower die bed I I is reciprocatively mounted of metal after each forming operation may be upon guide rollers l2 extending from the frame positively stripped from the bite between the and said bed is provided with dowels l3 which ex male and female dies. ‘ tend through apertures in the upper die bed l0 Referring to Figure 6 of the drawings, I have whereby said companion sets of beds are recipro illustrated a mechanism similar to that shown in cated in unison. The upper‘ die bed H) is formed the upper reciprocative die bed in Figure 4 of the with ears l4 having cam tracks l5 therein, drawings. In this form of my invention I provide adapted to be engaged by rollers l6 carried by a reciprocative lower die bed H’ with companion rotating cranks H, which are formed at the end cams 15' similar to the upper cams in all respects. of thedrive shafts l-—l, which shafts are actuated In this exempli?cation of the invention, with the by any means for imparting timed rotation there‘ synchronized crank shafts put into operation, the to. From the foregoing description with reference to Figure 4, when the sheet of metal is fed be-, tween the dies the initial formation of the seam will be of greater length or of the same length as the initial die bite. Hence, when the cranks are dies will ?rst be brought together for stamping, followed by a forward feed movement for'the sheet during the biting action of the dies. When the forward feed movement is completed the cams will cause the'dies to open vertically, where by the metal is freed from the bite and said beds in the position shown in Figure 4, the die beds 75 will now move rearwardly preparatory to a second have been fed to their extreme position rear‘ 5 2,405,738 downward compression movement between the upper and lower beds and is positively affected by the synchronized cams. While I have shown various modi?ed forms of an eccentric shaft engaging the ear apertures of at least one of the jaws, and vertical guide means connecting the jaws. 2. A machine for feeding and folding the edges mechanisms for carrying out my invention, it 5 f sheet metal, a pair of superimposed elongated should be understood that I reserve the right to jaws, apertured ears extending therefrom, a com vary the means for carrying out my invention plementary series of equi-distant spaced die units within the scope of the claims. I claim: of di?erent character extending from each jaw, 1. A machine for feeding and folding the edges 10 an eccentric shaft engaging the ear apertures of at least one of the jaws, and guide pins extending of sheet metal, a pair of superimposed elongated from one jaw in slidable engagement with the jaws, apertured ears extending therefrom, a com companion jaw. plementary series of equi-distant spaced die units of different character extending from each jaw, HAROLD V. DETTMAN.