US1027457A

US1027457A - Process of making metal caps.

Info

Publication number: US1027457A
Authority: US
Inventors: Oscar Zerk
Original assignee: ZERK Manufacturing Co
Current assignee: ZERK Manufacturing Co
Priority date: 1910-10-26
Filing date: 1910-10-26
Publication date: 1912-05-28
Anticipated expiration: 1929-05-28

Description

PROCESS 0F MA METAL CAPS.

IIIIIIIIIIIIIIIII 0T.26, 1910.

I. A "@vcafn md/M www UNITED STM-WENT OFFICE.

OSCAEAZERK, F CLEVELAND, OHIO, ASSIGNOR TO THE ZERK MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A .CORPORATION OF OHIO.

I To all lwhom t may concern.'

PaocEss or MAKING METAL cArs.

' Specification of LettersiPatent.

Be it known that I, OSCAR giving to t-he exterior of metal caps a suit- `my treatment.

able gripping surface, and the process 'con-- slsts of certain stepsby 'which the cap is held and breached without liability of'tear* ing, so 'that a thin metal cap may be given The drawing shows,I suitable dies lfo-r broaching the capuand thereby illustrates my process.

In the'drawings, Figure v1 is a central `sect-ion through the `male and female die 'and a cap in position to be broached; Fig. 2 is-a cross section of the female die; Fig. 3 `is a cross section of the male die; Fig. 4 is -a perspective view of the blank cap shown in vertical section inl Fig..1; Fig. .5 isa pern spective' of the cap complete; Fig. 6- is a' cross section ofthe cap completed, and'Fig.- 7 is a cross section of a completed cap zhav ing a modified form of exterior grippingv surface.

As shown in the drawings, 10 represents the male die, which-is'shown as a cylindrif cal member having a reduced cylindrical portion 11 on the same axis, an abrupt an- `nularishoulder 12 connecting the two cylindrical surfaces. The female die is indicated by 15.- AItis an' annular member having a- .fluted interior providedby suitable parallel ribs lfaboutits interior surface, which ribs are parallel with the axis ofthe open-- ing. .The smallest diameter of the o ening,`that is the distance betwee`nl the acesof ribs which are diametrically opposite, `is

preferably slightly greater than the dialneter of the male die. lThe face of the annu'-` l'ar portion of the female'die which'comes adjacent to the cap may be chamfered, as-

shown at 18, a sharp cutting edge being thus provided at the beginning of the flutes or'projections. y

1 20, in .the drawing, indicates a thin ymetal ZERi-i, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga andState.v

cap having a cylindrical wall and an integral top, designated 21. Before treatment with my d1es,the exterior of this cap may Patented May 28,1912. Application' mea october 26, 1910. serial No. 589,120. i

bejysmooth, and the cylindrical wall of thel cap may be of substantially the same thick- An ess or somewhat greater than the top por- -t1on, Accordingly, the blank which I use may be, itself,

stamped from a' disk of sheet metal.

Fig. 1 shows the blank cap 20 on hamale die ready for the female die'/ to be forced down thereon to. broach the 'exterior surface. .It will be seen thatthere /is .some space lbetween the extreme' end -of the portion 11 of the male die and the -top 21 of the cap, so that the thrust resultingfrorn the broaching actionis taken on the annu- .lar shoulder 12 by the cylindrical wall of the cap. This relieves the's'houflder of the cap where the top joins the cylindrical wall from any tension, which .might otherwise tear it.A lVith such a cap in such position, the female die is simply forced,downward` over the cap, brojaching theisurface thereof to produce the'cap` as Ashown in Figs.' 5 and An essential feature of the process is to holdthe cap7 ortheportion ofthe cap being br'oached,'under compression duringthe broaching. .This enables me to operatewon av thin metal, which might otherwise tear,

and it insures av uniform finished product.

The cap blank shown in Fig. is.adapted' tobe made by stamping a sheet metald-isk,

in ya manner well understood. vTliisstamping operation naturally thickens thecylin.

dricalwall and, thoughthe disk is thin, there is', accordingly, suflicient metal on the cylindrical wall to provide, not only vfor the 'breached exterior of this process,-but for the internal threads which are afterward turned into the cap, as shown at 24 .in Fig. 5. The ribs of the femaledie which determine the character of the broaching may have faces of some extent or may come .to a line, so that the'resulting gripping surface on the cap is of the character shown in Figs. 5 and 6, having parallel sided lribs 22, or of the form shown inF ig. 7 ,Where the ribs 23 are Vshaped'.

Having thus what I claim is l. The process 4of treating a .metal cap described my invention,`

having a top and side Wall consisting of breaching an exterior portion of the Wall f the cap while the metal adjoining such portion is held under, compression against a 'support and With pressure off ofthe top.'

2. The process of treating metal capslconsisting of holding a b1ank, having a cylindrical Wall and a top portion, with the base of the Wallagainst a support', and breaching the'exterior surfce of the wall by pres- 10 sure direc'ted toward said shoulder.

In testimony whereof, I hereunto aix my I signature in the presence of twolwitnesses.

y, OSCAR ZERK. Witnesses: l

B. M. A3011,

ALEX. FoRsTnIN.