USRE14713E - putnam - Google Patents

Description

A. L. PUTNAM. PROCESS OF FORMING TAPERING CROSS SECTION DISKS.

APPLICATION FILED JAN.19.I9IB.

Beissued Aug. 19, 1919.

3 866)? L fVznam WWW A. LQPUTNAM. PROCESS OF FORMING TAPERING CROSS SECTION DISKS.

APPLICATION FILED JAN. I9. 1918.

Reiasued Aug. 19, 1919. I 14,713.

2 SHEETS-SHEET 2.

awuemto z Cutaway-6" I UNITED S A PATENT OFFICE ALDEN L. rurmm, or DETROIT, MICHIGAN, assmnon. To DETROIT PRESSED STEEL COMPANY, or DETROIT, mrcnxom, A conrona'rron or MICHIGAN.

PROCESS OF FDBMING TAPERING CROSS-SECTION DISH.

Specification of Relssued Letters Patent. Reissued Aug. 19,1919, I

Originall'o. 1,245,270, dated November 6, 1917, Serial No. 151,800, filed February 28,1917. Application for reissue filed January 19, 1918. SerlalNo. 212,789.

To all whom it may concern:

Be it, known that I, ALDEN L. PUTNAM, a citizen of the United States of America, residing at Detroit, in the county of Wayne I and State of Michigan, have invented certain new and useful Improvements in Processes of Formin Tapering Cross-Section Disks, of which,t e following is a specification, reference being had therein to the accompanying drawings.

The invention relates to the manufacture of sheet metal disks of tapering cross section and more particularly to disks designed for use in the construction of vehicle wheels;-

It is the object of the invention, first, to avoid wasteof stock; and second, to facilitate the formation of a tapering cross section or varying gage. from a blank of uniform gage.

With these objects in view the invention com rises the novel method as hereinafter set orth.

In the drawings: v

Figures 1 and 2 are respectively a plan view and side elevation of. the blank;

Fig. 3 is an elevation showing the first of forming the blank into an annulus;

ste l ig. 4 is alongitudinal. section thereof;

ping the cylindrical blank;

Fig. 6 shows the initial operation of expanding the cylinder into disk form;

Fig. 7 is a similar vew at the completion of the operation;

Fig. 8 is a cross-section through the completed disk; and

Fig. 9 is a similar view showing a modification.

The specific embodiment of my invention illustrated is a method of formlng disks for vehicle wheel bodies, the characteristic feature of which is a tapering gage or crosssection from the center to the periphery. Disks of this character may be formed from circular flat blanks of sheet metal which are rolled or otherwise expanded in diameter and thinned in cross section. Such a method Fig. 5 illustrates the second step of cup is, however, open to objection that there is a large waste of sheet metal in the cutting of circular blanks. Furthermore, the opera 'tion of expanding. the blanks diametrically blank diametrically or in the plane thereof,

it is first formed into a cylindrical annulus and the latter is then expanded, with the result that the gage orflcross-section is tapered at the same time that the form is changed.

In detail, A is a rectangular sheet-metal blank preferably of a gage or thickness equal to the desired thickness of the central portion of the disk. This blank is first bent into an annulus B, Fig. 3, and the opposite ends thereof are butt-welded at C. The cylinder thus formed is then expanded at one end, preferably by rolling between tapering rolls, such as D and E, which will change the form from that shown in Fig.

6 to that shown in Fig. 7. l If desired the operation may be continued until allportions of the blank are substantially in the same plane but for the construction of vehicle wheels this is not desirable, a dished disk being of greater strength. Thus Fi 8 illustrates such a construction of dished fisk while Fig. 9 shows a disk having all portions in the same plane.

Where the central aperture in the disk is relatively small it may be necessary to contract the diameter of one end of the cylindrical blank before expanding the other end thereof. This step is shown in Figs. 4 and 5, Fig. 4 illustrating the cylindrical blank just formed and Fig 5 a blank with a cupped or contracted end-which is formed from the construction of Fig. 4 by the operation of suitable dies.

By use of my improved method the cost of manufacture is greatly reduced both in the savin of stock and the lessening of the diflicu ty in expanding the blank. It

will be understood that the operations are metal, bending said blank into an annulus,

simultaneously change the same into disk form and progressively thin the cross-section thereof.

3. The method of forming tapering disks, comprising the cutting of a substantially rectangular blank from sheet-metal of uniform gage, bending said blank to form an annulus, welding contracting or cupping one end of the annulus to reduce the diameter of the aperture therein and expanding the o posite end of the annulus to simultaneous y change the same into disk form and tapering the cross section thereof.

4. The method of forming dished disks of tapering cross section, comprisin the cutting of a substantially rectangu ar blank from sheet-metal of uniform gage, bending the blank to form an annulus, weldin the ends of the blank to each other, cupping or contractin oneend of the annulus'to reduce the iameter of the aperture therein, and expanding the opposite end of the annulus to increase the diameter and reduce the cross-section thereof until a dished disk of the desired form is obtained. i

5. The method of forming disks .of tapering cross-section, comprising the cutting of a substantially rectangular blank from sheet-metal of uniform gage, bending said blank to form an annulus, welding the abutting ends of the blank to each other and roll ing the annulus to expand the diameter of the ends of the blank to each other,

one end thereof simultaneously to progressively reduce the cross-section thereof.

6. The method of forming" disks of tapering cross-section, comprising the application of reduction pressure progressively from one end toward the other, of an annulus to enlarge the diameter and. decrease the the periphery.

8. The method of forming tapering disks, comprising the forming of an annulus, cupping one end of said annulus to reduce the diameter of the aperture therein and pro: gressively expanding the annulus toward its opposite end to increase the diameter and reduce the thickness.

9. The method of forming disned disks of tapering crosssection, comprising the forming of a cupped annulus, and the rolling of the walls of said cup to rogressi'vel increase the diameter and re uce the thic ness thereof.

In testimony whereof I have hereunto afiix'ed my; signature at Detroit, WVayne county, Michigan, upon this 4th day of J anuary, 1918.

ALDEN L. PU'i NAM.

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