US1161628A

US1161628A - Dies for making articles from sheet metal.

Info

Publication number: US1161628A
Application number: US1764015A
Authority: US
Inventors: Joseph De Gaeta
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-03-29
Filing date: 1915-03-29
Publication date: 1915-11-23
Anticipated expiration: 1932-11-23

Description

'1. DE GAETA.

DIES FOR MAKING ARTICLES FROM SHEET METAL.

APPLICATION FILED MAR. 29. 1915.

1 ,1 61 ,8Q& Patented Nov. 23, 1915.

3 SHEETS-SHEET I.

q vbliwzoowz 3m) wtoo 3 fi/Zgdjgl/ZM sa /121 wig 0 m 1. DE GAETA.

DIES FOR MAKING ARTICLES FROM SHEET METAL.

APPLICATION FILED MAR.29,19I5- Patented N Ofv, 23, 1915.

3 SHE'HSSHEET 2.

J. DE GAETA.

DIES FOR MAKING ARTICLES FROM SHEET METAL.

APPLICATION FILED MAR. 29. 1915.

1,161,612. Patented Nov. 23, 1915.

3 SHEETS--SHEET 3- COLUMBIA PLANOORAPH COHWASHINUTONI I) C.

Y .rosnrn DE GAE'IA, or new YORK, N. Y.

DIES FOR MAKING ARTICLES FROM SHEET METAL.

Specification of Iietters Patent.

- Patented Nov. 23, 19115.

Application filed. March 29, 1915. Serial No. 17,640.

To all whom it may concern:

Be it known that I, JOSEPH DE 'GAETA, a subject of the King of Italy, and a resident of the borough of Brooklyn, county of Kings, and city and State of New York, (having declared my intention of becoming a citizen of the United States,) have invented certain new and useful Improvements in Dies for Making Articles from Sheet Metal, of which the following is a specification.

My improvements are applicable for use in the manufacture of various articles from sheet metal blanks, but are designed more particularly in the present case for, and are herein shown and described as adapted to, the making of corner shields for trunks, boxes, and the like, where angular parts are to be protected and reinforced against'the exigencies of rough usage and contact with extraneous objects.

The main object of the invention is the production of the article desired in a cheaper and more effective manner than theretofore,-the product being more perfect and symmetrical in shape, and involving the expenditure of less than one fourth in time, labor and manipulation heretofore involved.

The invention consists in the combination and arrangement of parts hereinafter described and claimed specifically, whereby the sheet metal for each cap or corner shield is first partially drawn into shape centrally, then perforated to form the attachment holes, then severed from the sheet, and then finally fully drawn and stamped into perfect shape,all these operations being conducted simultaneously in a single press, so that, after the first three preliminary strokes of the plunger and male dies, a perfect corner shield is produced at each stroke of the press.

In the accompanying drawings, Figure 1, is a side elevation of a power press embodying my improvements; Fig.2, a perspective view of cap or corner shield; Fig. 3, is a diagrammatic representation in series of the successive steps involved in the production of the corner shield according to my method; Fig. 4, a top view of the shield piece as severed from the sheet metal blank preparatory to being subjected to the action of the finishing dies; Fig. '5, is a top view on a reduced scale of the finished corner shield; Fig. 6, is a top View of the gang of female dies; F ig. 7, a sectional elevation taken mainly on line 'Z '7 Fig. 6; Fig. 8, is a sectional elevation of the gang of male dles; Fig. 9, a view of the undersidethereof.

P, represents a power press of any ordinary or desired construction, 79, indicating the reciprocatory plunger to which the gang M, of positive or male dies are rigidly se cured, and p, the usual bed upon which the gang of negative or female dies N, are mounted.

The product desired in the present case is shown in Fig. 2,,-2'. e., a cap or shield S, to be applied to a corner of a trunk, suit case, box, or rectangular receptacle of any kind. These shields have heretofore been made by five separate and distinct manipulations. First, a disk was punched out of a sheet metal blank, and then the cap was struck up at a single blow in a die press, the metal suffering severe strain in the single drawing,

resulting in cracking of the apex, puckering of the sides and particularly of the edges of the cap. Next, the three attachment holes 8, s, s, for rivets or other means of securing the shield in place for use, were separately punched, thus, as before stated, involving five distinct operations,the time and labor involved being the principal factor in the cost of the article produced. As millions of these trunk corner caps or shields are inade and used every year, even a slight saving in cost of manufacture is an important consideration; and another desideratum is the production of a cap or shield with side walls perfectly smooth and unpuckered, and of-uniform surface. This I accomplish by my method and apparatus in such manner that a perfect shield cap is formed at each stroke of the press after the sheet metal blank has been fed into the-apparatus by the preliminary steps. Thus in Fig. 8, 0, represents the end of a blank ribbon of sheet metal be fore being fed to the dies; 1, the result of the first feed step; 2, the result of the second; 3, the result of the third; and 4, the result of the fourth, representing of course four reciprocations of the plunger and male dies.

The first operation on the sheet metal strip 0, is the formation of the central or incipient depression 8, which draws or upsets the metal for approximately one half (more or less) of the final depth of the cup shown in Figs. 2, and 5. The next operation punches the three holes 8, s, s, simultaneously; and the next severs the disk, shown Fig. 4, from the sheet metal blank 0,

leaving the hole and scrap This partially cupped and perforated disk shown in Q Fig. l, then drops by gravity into-position to be acted upon by the finishing dies, from which the finished product'is projected in the form shown in Figs. 2', and 5,this final operation having completed the cupping of the whole disk severed from the sheet metal blank 0. It is thus obvious that if a long sheet metal blank ribbon 0, is used (and there is nolimit in this respect other than that of the length of the ribbon that can be produced for'the purpose) after the thirdintermittent feed step, a complete shield S, will result from each successive stroke of the plunger and male dies M. In

drawings the preliminary male die in, the

punches m, and the disk cutting die 472?, are arranged in alinement in the platen m m, while the finishing die m is mounted in a rear extension m, of the platen m m representing the platen stem by which the platen is secured to the reciprocating plunger p, of the press. By reference to Fig. 9,

in whichthis stem m is shown in dotted lines it-will be seen that it occupies a medial position between the finishing die and the alinement of the preceding dies, so that all are adequately supported. In coinciding manner and arrangement the gang N, of female dies are positioned in the negative die plates a n ,,.which are supported upon the press bed 7). That is to say the preliminary die n, the perforating die n, and the disk cutting die 71?, (see Fig. 7,) are arranged in alinement in the plates a 92-, while the finishing die n is at the rear, connected with the disk-cutting die W, by the gravity guide ways of, extending rearward and. downward from the diebase plate a.

The platen consists of the upper plate m integral with the stem m and the lower platem on which the'dies and punch m, m, m m are directly mounted. The preliminary die m is rigidly secured to the plate m, by a set screw a, and is surrounded byja stripper ring a, between which and the saidv plate m is interposed an elastic resilient cushion. a9, preferably although not necessarily of rubber (see Fig. 8,). This stripper a, holds the sheet metal blank down against the bed plate n, when the plunger ;19, isdepressed'. It is suspendedv on screws a the shanks of which act as supporting. guides freeto slide in the plates m m, as the elastic-resilient cushion a yields or expands.

The-punches m which form the attachment holes 8, of the corner shield S, are mounted in thelower plate m, and held in place in their sockets by the upper plate on, of the platen. The disk-cutting die m ,is secured to the lower plate mi, by the set screw 1); and the finishing die m, to the extension m of the plate on, by the set screw 0. These or any other well known or suitable means of mounting the male dies in the platen may be resorted to as may be found most expedient, as I do not limit myself to these minor details of construction. Similarly the mounting and support of the female dies 72-, a, M, and n may be effected in any desired and well known manner. As shown in the accompanying drawings, the said dies are formed in the die plates 17, 01, which are held in place on the base plate a, by means of screw bolts d, d, at, two of which serve to secure the cap plate at, to the die plate n1, in which the perforating die a, and disk cutting die n are formed. The preliminary mortise die n, conforms of course to the shape of the male die m; and it is provided with an ejector e, of well known character which raises the blank out of the socket as the male die m, recedes. A similar ejector c, is used in connection with the finishing die mortise a The intermediate mortise perforating die n, is formed with the triangular recess 72 to accommodate the incipient draw of the metal blank effected in the preliminary dies m, n, as well aswith the holes n", n 112, two of which are shown in dotted lines in Fig. 7 for the accommodation of the punches m, these holes 12*, extending through both the stripping plate 65 and the negative die plates n, and n3 so as to discharge the small disks punched from the blank in the formation of the attaching holes 8, s, s, of the corner shield S. The cap plate (Z is formed with coincident perforations d", for the passage of the punches m, as Well as with triangular openings n coinciding with triangular recesses 01/, in the die plate at.

The cylindrical recess of the disk-cutting die 11?, extends through the bed plate n, and through the upper portion of the bed plate a, as shown in Fig. 7, thus leading the severed disk to the guide ways n n, which extend through and from the base plate at, to the female finishing die n. The cap plate 03 is formed with a circular opening a, coinciding with the die opening n below so as to admit of the passage of the male die m The cap plate d constitutes a stripping plate for the male dies n, and n 9, g, are adjustable gages or stops arranged in conjunction with the finishing die 11. to accurately centralize the blank ig. 4,) delivered by the ways it. These gages 1,161,628 :1: ill

9, 9, may be supported in any suitable manner on stationary parts of the apparatus, and it is to be understood that the die n is also supported on the bed of the press in a manner well known in the art.

h, 72?, N, are gage stops for positioning the end of the sheet metal blank 0, with relation to the female dies.

71/, and W, are used only in starting the blank 0, through the press. They each consist of a pin retracted normally by a spring. By pressing in theistop h, temporarily the edge of the blank may be gaged for the dies m, n, and released after the stroke of the plunger, when the stop it, will be retracted automatically upon release, so as to be out of the way of the further and continuous feed of the blank 0-. In like manner the gage pin 7?, may be manipulated with relation to the dies m, n. Ihe stop h is permanent in position, first acting as a stop for the front edge of the sheet'metal blank in the preliminary feed and then as a stop for the corresponding inner edge of each hole 0, as the feed of the blank 0, is continued. Any other desired or equivalent means of gaging the feed of the sheet metal blank 0, may be substituted if preferred, the means herein shown being only illustrative of the func tion performed.

It will be noted that by my apparatus and method of treatment the coupling of the metal is effected only in part by the first dies; the attachment holes are next formed simultaneously in portions of the blank sheet still on the flat, and the disk of the proper size then severed from the sheet, producing a flanged blank like that shown in Fig. 4, with the attachment holes a, in the flat flanged portion. Hence the finishing dies perform only the function of bringing the flange portion of the blank Fig. 4, into alinement with the side walls of the depression 8, formed by the preliminary dies m, n, as hereinbefore set forth. Owing to this step by step evolution of the product, the resultant corner shield is free from pucker, corrugation or irregularity of any kind, the surfaces being perfectly even and smooth. Incidentally attention may be called to the fact that by forming the attachment holes 8, in the flat portion of the sheet metal blank I am enabled to form them simultaneously and thus eliminate two operations and manipulations heretofore involved in the manufacture of such corner shields. And as, after the front edge of the sheet metal blank has reached and passed the stop b the continuous feed and operation of the press produces a perfect corner shield at each reciprocation of the press the economy effected in the cost of manufacture is obvious. It is also obvious that this press and method is applicable to the manufacture from sheet metal of other articles similar in character and requirements of treatment, so that I do not limit myself strictly to the production of corner shields, a distinctive feature of my invention being that I accomplish in one machine and practically in one feed (after start) and manipulation results that have heretofore necessitated the use of four separate machines,4l. 6., a cupping machine, and three punching machines to keep up with the production of the cupping machine; and there are other lines of manufacture of sheet metal articles in which equivalent results may be attained by the utilization of the essential features of my invention. Hence,

What I claim as my invention and desire to secure by Letters Patent is,

1. In a power press of the character designated, the combination of a series of male and female dies comprising preliminary upsetting dies, perforating dies, and disk cutting dies arranged in alinement, and finishing dies positioned at the rear of the disk cutting dies and connected therewith by gravity guideways.

2. In a power press of the character designated, the combination of a series of male and female dies mounted at an angle and comprising preliminary upsetting dies, perforating dies, and disk cutting dies arranged in alinement, and finishing dies positioned at the rear of the disk cutting dies and connected therewith by inclined ways, for the purpose described.

3. In a power press of the character designated, in combination, a series of male and female dies set at an inclination and comprising preliminary upsetting dies, perfo- JOSEPH DE GAETA.

Witnesses:

Gno. l/VM. MIATT, DOROTHY MIATT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G.