US1067115A - Machine for bulging cylindrical sheet-metal bodies. - Google Patents

Description

' c. A. HUPFORD. 5 MACHINE POR BULGING CYLINDRICAL SHEET METAL BODIES*l APPLICATION FILED J'UNE12, 1912.

I Patented July 8, 1913.

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C. A. HUFEORD. MACHINE PO'R- BULGING GYLINDRIGAL SHEET METAL BODIES.

APPLICATION FILED JUNE 12, 1912,.

L06?, 1 1 5. Patented July 8, 1913.

2 SHEETS-SHEET 2.

CHARLES A. HUFFORD, OF INDIANAPOLIS, INDIANA.

MACHINE FCR BULGING CYLINDRICAL SHEET-METAL BODIES.

Specification of Letters Paten-t.

Patented July S, 1913.

Application filed June 12, 1912.` Serial No."?03,323.

To all iii/tom 25' may concern Be it known that l, CHARLES A. l-lUrronn,

a citizen ot the United. States, residing at Indianapolis, in the count-y of Marion and State otI Indiana, have invented certain new and uset'ul improvements in Machines tor Bulging Cylindrical Sheet-lvlctal Bodies; and l do declare the following to be a full7 clear, and exact description ot the invention, such as will enable others skilled in the artto which it appertains to make and use the same7 reference being had to the accompanying drawings, and to the ligures of reterence marked thereon, which form a part ot this specitication.

This invention rela-tes to improvements in machines for bulging cylindrical sheet metal bodies into convex form, as in the production of sheet metal barrels or kindred articles ot manufacture.

The object ot the invention is to provide a machine which is substantially positive in its action, and by means of which the operation stated may be performed quickly and with t'acility and accuracy.

An embodiment ot the invention is illustrated in the accompanying` drawings wherein Figure l is a central longitudinal section showing the parts ot the machine prior tol an operation thereof; Fig. 2 is a similar view but showing the machinev inl operation; Fig. 3 is an end elevation of one ot the sectional. dies or forming units; Fig. 4l is a developed plan view showing the relations ot the die sections to one another when the die is collapsed; F ig. 5 is a similar view but showing the relation ot" the die sections to one another when the die is expanded.

Similar characters ot reference designate corresponding parts throughout the several views.

The operating parts may be supported from a bed l. In the embodiment shown the machine includes a pair of opposed sectional dier'. designated generally by the numeral 2 and simultaneously movable toward and away from one another. Means tor operating the dies are provided at each end oi the bed. As shown, the die operating means include cylinders 3 and pistons l working therein and actuated hydraulically.

Each die 2 comprises die sections 5 ol suitable outline which are arranged in an annular iath. Said die sections are provided with outwardly directed extensions 7 which are pivoted in slotted ears 7 disposed radially upon a head 8. The pistons d are mounted on rods 9 which pass loosely through central openings in the heads S and serve, through intermediate connect-ions to e'i't'ect axial and pivotal movements ot the die sections and thereby to move the `dies into and t'rom their operative 'positions and, at the same time to expand and collapse them. The intermediate connections 'between the rods 9 and the die sections .may advantageously include sleeves l() which are mounted loosely on the rods S), between collars l1 and ll"L tast on said rods, and links l2 which connect each sleeve l0 and the die sections to be operated thereby.

` ln order to maintain the dies in normally collapsed relation and at the same time to cause the dies to move with the rods when the latter move inwardly, expansive coil springs 13 surround the rods 9 and are arranged between the outer faces ot the heads 8 and collars 14 adjacent said heads and tast on the respective rods 9.

y Thi arjfcuracy ot the operation ot the dies insured by positively centering and guiding the rods 9 and for this purpose, suitable bearings l5, upstandingfrom the bed l, may be provided. It is also preferred, toward the same end, to provide one ot the rods 9 with a reduced axial extension 1G and the other rod with a slot or opening 17 to recoive said extension`v during the movements ot' the rods to expand the dies.

The cylinder to be shaped is `placed be tween the dies, it being assumed that the latter are retracted as tar as possible from one another and that their die sections are'in collapsed relation. Thereupon the dies are moved simultaneously and axially toward one another` ultimately vpassing through the ends Ot the cylinder. The axial movement of the dies is arrested by the engagement of `the heads S against the ends of the barrel but the axial movements ot the rods 9 continues against the tension ot the springs however, and until it is arrested by the en; gagelnent ot' the collars let against the heads S or by the engagement-ot said rods against one another. ln this last stage. ot' their-axial niovement the rods 9 are etliective, through the, agency ot the sleeves 10, the collars Ill in the r mr oit said sleeves, and the links 12, to move the die sections 5 outwardly on their pivots, thereby expanding the dies 2 and causing the latter to bulge the barrel.

Thereupon the movements of the rods 9 are reversed, that is to say said rods are simultaneously retracted; and during the first portion of such retractile movements throughout which the springs 13 hold the heads 8 against the ends of the barrel, the dies are collapsed, the necessary movement of the sleeves 10 with the rods 9 being imparted by the collars 11 which are immediately in advance of said sleeves. Thereafter, as the outward movement of the rods 9 continues, the collars 11 engage the heads 8 and the dies are positively withdrawn from the barrel, as is obvious.

In order that the bulging or changing of the barrel body may be uniform throughout the extent of said body, each die section 5 is preferably provided along its sides with teeth 1S which are constantly in mesh with the teeth of the adjacent die sections, both in the collapsed and expanded condition of the dies. .In this way continuous spaces between the die sections, when the dies are expanded, are eliminated; and it follows that the formation of flat longitudinal areas at intervals throughout the barrel body will be prevented and the barrel will be uniformly convex throughout its extent.

Having fully described my invention, I claim 1. In a machine of the type set forth, a collapsible die including a head and die sections pivoted thereon, an axially movable rod, a yielding connection betw en the rod and the head, and positive connections between the rod and the die sections to canse movements of the latter on their pivots consequent to the movements of the rod.

2. In a machine of the type set forth, a collapsible die including a head, die sections pivoted thereon, an axially movable rod, an expansive coil spring interposed between the head and the rod, and link connections interposed between the rod and the die sections to cause movements of the latter on their pivots consequent to movements of the rod.

3. In a machine of the type set forth, a collapsible die including a head, die sections pivoted thereon, an axially movable rod, an expansive coil spring interposed between the head and the rod, a sleeve loose on the rod, collars fast on the rod and between which the sleeve is mounted, and links connecting the collars and the die sections.

4. In machine of the type. set forth, a collapsible die including a head and die sections pivoted thereon, an axially movable their pivots consequent to movements of the rod.

6. In a machine of the type set forth, an expansible and collapsible die including a plurality of die sections, annularly arranged and mounted for radial movement, each die section having its sides formed with teeth which constantly intermesh with the teeth of the adjacent die sections.

7. In a machine of the type set forth, a. pair of end opposed expansible and collapsible dies, die operating means including axially movable rods and connections between each rod and a corresponding die to produce axial movements of Said dies and also expanding and collapsing movements thereof.

8. In a machine of the type set forth, a pair ofend opposed expansible and collapsible dies, die operating means including rods which are movable axially and simultaneously in opposite directions, and connections between each rod and a corresponding die to produce axial movements of said dies and also expanding and collapsing movements thereof.

9.l In a machine of the type set forth, an axially movable rod, a head having an opening through which the rod loosely passes,a plurality of die sections pivoted in the head for radial movement, and link connections between the rod and the die sections.

10. In a machine of the type set forth, an axially movable rod, a head having an opening through which the rod loosely passes, a plurality of die sections pivoted in the head for radial movement, link connections between the rod and the die sections, and a resilient connection between the rod and the head.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES A. IIUFFORD. lllitnesses HENRY STELCK,

J. I-I. TRIMBLE.

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

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