US2036408A - Closure - Google Patents

Description

- April 7, 1936e G. GQEBEL CLOSURE Filed May 23,1954

etv

atented Apr. 7l 1936 wel lDlLUSURE George Goebel, Baltimore, Md., asslgnor to Crown Cork & Seal Company, Inc., Baltimore, Md., a corporation of New York Application May 23, 1934, Serial No. 'l'lhld The present invention relates to caps and more particularly to a two-part screw cap for bottles, jars, and the like.

An essential feature of the invention resides in a cap of this type having (l) an outer shell which is smooth and continuous; (2) an inner shell or member having thread engaging portions completely enclosed in said outer shell and provided Witha screw thread; (3) the two shells connected at their lower ends so that they will will not rotate with respect to each other, nor distort when the cap is turned on a container.

The inner shell has its lower edge outwardlyr folded and flattened against the skirt to form a strenghtenng hem. This hemmed edge is roughened or provided with an irregular contact surface preferably upon each side.

The free edge of the outer shell is curled inwardly to embrace and engage the roughened hemmed edge of the inner shell to flxedly associate the two shells; whereby when the shells are assembled and the cap is turned on a container, the shells will not rotate relative to each other.

Other objects and advantages of the invention will become apparent from the following description when taken in conjunction with the accompanying claims and drawing.

Referring to the drawing in which is disclosed a preferred embodiment of the invention:

Figure 1 is a side elevation of a two-piece cap made in accordance with the invention showing the smooth continuous exterior.

Figure 2 is an enlarged cross-sectional view of the cap of Figure 1.

Figure 3 is an enlarged detailed section oi the means for securing the shells together against relative rotation when the cap. is turned. f

Referring to the drawing in which like numerals indicate like parts in the several views, l0 designates as a whole, a two-piece metallic cap for use as a closure on containers, such as bottles, jars, and the like.

The cap I0 comprises a preformed inner shell or member Il having a top preferably formed Vwith a circular medially raised at portion l2 connected'to the outer marginal or depressed portion I3 by a circumferentially inclined portion I4. The inner members has 'a metallic skirt I5, knurled as at I5', and spirally threaded or grooved below the knurling as at I6 so as to detachably connect the cap to a container having a threaded finish. The skirt I 5 has an outwardly dared portion I1 which terminates in the free end i8, as shown ln Figures 2 and 3. The free end I8 is spaced from the adjacent wall of the container when the cap is applied thereto and forms an enlarged entrant portion. The end it is preferably folded outwardly, as at lll, and the folded portion flattened upon the skirt to form the flat doubled wall or herinner edge 2. The double wall or hemmed edge 2t acts to strengthen and rigidify the cap.

The flattened or hemmed edge 2t' has its surfaces roughened preferably upon each side, i. e., interiorly and exteriorly of the inner shell as at 2l, and as shown in Figure 2. Theroughenng may be produced in any suitable manner as by vertically corrugating or indenting the hemmed edge.

The shell ll is completely enclosed within an outer shell 22, which preferably has a curved, substantially continuous top 23, that is engaged and supported by the top of the inner shell along spaced circular lines 24 and 25 to maintain the outer top in its preformed shape. The shell 22 has a smooth, depending metallic skirt 26 continuous with the top 23, and may be ornmented in any suitable fashion.

It will be observed that the inner shell is completely formed prior to assembly Within the outer shell.

'I'he outer shell has its free edge curled vinwardly, as shown at 2l, so that when the shells are assembled, as shown in Figure 2, the inner shell is completely enclosed by the outer shell and the curl 21 embraces and engages the roughened hemmed edge 20. This firm engagement is assisted bythe resiliency of the outwardly flared portion I1 of the inner shell and the inward curl of the outer shell constantly maintaining the parts in contact and gripping relation.

The curl is formed `by bending the free edge of the skirt of the outer shell under the hemmed edge and upwardly and inwardly so that the free edge lies on the interior of the cap as shown at 28.

The inward bend of the portion 28 produces a circumferential groove 29, whereby the edge 30 of the' curl will circumferentially engage the roughening 2| on the interior of the hemmed edge.

It will be observed that the roughened hemmed edge is flatly engaged on one side by the adjacent wall of the skirt of the outer shell 22, as at 3|, and on the other side by the free edge 3D. In this manner, the two shells are firmly clamped together against relative rotation when the cap is turned on a container.

By hemming the lower edge of the inner shell, it is strengthened and, in like manner, the curl produced on the outer shell acts to rigidify the outer shell. When the assembled cap is turned on a container, the hem and curl of the respective shells absorb the strain and prevent distortion of the skirt portions of the shells. 'I'he curled edge 27 and the free edge 28 are smooth and continuous and cooperate with the flared portion i1 to form an unobstructed entrant portion for the cap. 'I'he flared portion will act to center the cap on the container or neck, and is suiciently yieldable to accomplish this result without producing strain, such as would tend to distort the smooth continuous appearance of the outer shell.

It will be understood that the inner shell is completely preformed and the outer shell, after the inner shell is inserted therein, will be subjected to the simple operation of forming the curl 2l'. In some cases, the curl is pressed into engagement with the roughened surfaces of the hemmed edge, but usually the curling of the edge 2l -Will sulice to produce a rigid contact between the same and the roughened hemmed edge, such that the shells are not rotatable with respect to each other upon turning of the cap.

The form of the invention herewith shown and described is merely illustrative of a preferred embodiment, and such changes may be made thereto as fall Within the purview of one skilled in the art Without departing from the spirit of the invention and the scope of the appended claims.

I claim:

1. A container closure comprising a shell having a top and a depending skirt, and an inner member overlying said skirt portion and formed With thread engaging portions, the lower edge of said inner member being folded on the body thereof to provide a thickened reinforcing hem, the inner surface of said hemmed portion being roughened to resist rotation thereof within the shell and the lower edge of said skirt on the shell being curled over said hemmed edge and the free edge of said curled over portion grippingly engaging said hern, whereby the inner member is fixedly held Within said shell.

2. A container closure comprising a shell having a top and a depending skirt, and an inner member overlying said skirt portion and formed with thread engaging portions, the lower edge of said inner member being folded on the body thereof to provide a thickened reinforcing hem, the inner and outer surfaces of said hemmed portion being roughened to resist rotation thereof within the shell and the lower edge of said skirt on the shell being curled over said hemmed edge and the free edge of said curled over portion grippingly engaging said hem, whereby the inner member is xedly held within said shell.

GEORGE GOEBEL.

Images