USRE19422E - Container closure - Google Patents

Description

Jan. 15, Q W BOOTH CONTAINER CLOSURE v 3 Sheets-Sheet l Jan. 15, 1935.

G. W, BOOTH CONTAINER CLOSURE origin-a1 Filed sept. 1e, 1932 5 sheets-sheet 2 Jan. 15, 1935. G. w. BOOTH Re.v 19,422

CONTAINER GLOSURE Original Filed Sept. 16. 1932 3 Shqets-Sheet 3 Ressued `Ilan. .15, 19,35 l l Re,

UNITED STATES PATENT OFFICE CONTAINER CLOSURE George W. Booth, Baltimore, Md., sssig'nor to Crown Cork & Seal Company, Inc., Baltimore, Md., a corporation of New York original No. 1,956,212, dated April 24, 1934, sex-iai No. 633,515, September 16, 1932. Application for reissue October 5, 19,34, Serial No. 747,108

1 claim. (ci. zzo-51) The present invention relates to container punch stamping machine and associated conclosures of the type designed to be fed from a veyor; stack and has to do with the form of the closure Figure 2 is a plan view of cutting and form'- land a method for producing and stacking the ing dies forming parts of the punching mecha- 5 closures so that adequate spacing of the closures nism; 5

`in-the stack is afforded. Figure 3 is a section on the line 3-3 of Fig- In order that the closures may be .surely sepure 2; arated and fed, it is desirable that they be stacked Figure 4 is a plan View of a closure disc proin uniformly spaced relation and such spacing duced by the illustrated punching mechanism; l is particularly necessary where the closures are Figure 5 is a section on line 5-5 of Figure 4; 10 cupped so as to tend to nest together tightly. Figure 6 is a greatly enlarged section on line While the present invention is of general applica- 6-6 of Figure 4. tion, I shall describe it with particular reference Figure '1 shows in section portions of two to a type of closure shown in my copending apstacked discs; l plication Serial No. 553,464, filed July 2'?, 1931, Figure 8 is an elevation partly in section of the l5 in the United States Patent Oillce. In the ap- Conveyor mechanism shown in Figure l and its plication referred to, I have shown a closure in. associated stacking mechanism; the form oi a substantially flat disc comprising Figure 9 iS a SectiOn 0n line 9-9 0f Figure 8; metal and nbrous iaminations adhesively united, Figure 10 shows in plan the bed 0f the punch- 2o the metal lamination being ductile so that the ing mechanism. the conveyor being Shown in ele- 20 marginal portion of the disc may be ironed and vation; and drawn over a container bead to take a natural Figure 11 ShOWSin axial CIOSS Section 8 package locking crimp therebeneath. As a desirable fea- 0f the new closure discs. ture in the stamping of such closure discs, the .Refenmg t0 the drawings and particularly t0 diameter of the disc is somewhat reduced in the Figures 1 t0 3 and lof reference numeral 12 des' 25 stamping operation by slightly off-setting the ignates the inclined Ped 0f Suitable stamping ap' central from the marginal portion thereof so params the bed havmg arfangeq therein the two that a shoulder is presented at the inner edge of rows of dies a to e and a to e Figure 10' the the marginal portion. I have found that Where a dehor (llefow bengtis'lggered relative to those lamination of fibrous material is used as the sealgud g (acdAs cse any SOT inl ing facing, the bending thereof in forming the le'c pr s a cy n ca an die 13 and a cylindrical forming die 14 and as shoulder causes a slight breaking and fraying here shown, the top inner edge of the forming of the ilbres at the bend and that these bres, die is provided with notches 14 spaced at ninety When the discs are Stacked engage the adjacent degreeintervals, the die shown in-Figures 2 and 3 35 disc surface with suilicient frictional effect to and in Figure 1 1n cross section being the die a, impair the feeding operation. In order to over- Figure 10, come this objectionable feature, I provide the The bed is provided with bores concentric with diSCS, acCording t0 the present invention, with the dies and extending through the bores and protuberances in such manner that the prointo the severaldies are ythe upwardly spring 40 tuberances of no two adjacent discs can come pressed` and reciprocable ejecting plungers 15. completely into register and even spacing of all` Guided in the frame 16 for reciprocation at the discs is thereby secured.' The provision of right angles to the bed is a head 1'7 in which are these protuberances and the proper stacking of mounted the usual cutting punches 18 and formthe discs to assure that no two discs with simiing punches 19, the former being adapted to colarly spaced protuberances shall be adjacent, operate with the dies 13 and the latter with the gives rise to certain problems with the solution of dies 14. A stripper plate 20 is spaced a suitable which the present invention is also concerned. distance above bed 12 and provided with aper- With this general introduction, I shall proceed tures through which the stamped blanks may'be to describe the invention with reference to the ejected. The stripper plate is continued beyond accompanying drawings which are illustrative, the lower edge of the bed and at its extremity but by no means restrictive, thereof. supports brackets 21 upon which is mounted a In the drawings, plate or trough 22 which supports the upper run Figure l is a cross section through a multiple of a conveyor belt 23, the conveyor being coexten- 55 sive with the bed and including head and foot pulleys 24 and 25, Figure 10, the former of which may be driven from any suitable means and at a speed related to the speed of operation of the punching mechanism. Preferably the head pulley is driven through suitable gearing from a rotary shaft of the punching mechanism.

An apron 26 is spaced below the projecting portion of the stripper plate 20 and forms with the latter a guide through which sheet material is fed to the stamping apparatus. An inclined apron 27 is arranged to guide the stamped closures to the conveyor 23.

In the operation of the apparatus, a sheet of material being fed to the punching apparatus, head l'l descends and the cutting punches 18 in cooperation with the dies 13, cut out discs whose marginal portions overlie dies 14 and are' gripped between the top surfaces of the latter and the lower ends of the cutting punches. Hereupon the forming punches 19 are moved relative to the cutting punches and within the upper ends of the forming dies a limited distance so that the central portions of the discs are downwardly off-set relative to their marginal portions and the disc metal is drawn into the notches 14', corresponding indentations being formed on the opposite side of the discs. Since the die 14 has four notches 14'. the disc produced thereby will have four protuberances bridging the anglek between the marginal portion of the disc and its central portion and angularly spaced about the disc center. 'Ihesheet is fed with its fibrous facing up so that the protuberances are on the metal faces of the blanks.

Theblanksfrom diesatoeand a' toe' areall ejected simultaneously and ordinarily pass to the conveyor 23 in the order a, a', b, b', etc., due to the staggered relation of the dies of the two rows. According to the invention, no two successive discs will have the same arrangement of protuberances so that since the discs are intended to be stacked in the order in which they reach the conveyor 23, the protuberances of no two adjacent discs can completely register and the discs will therefore be held in spaced relation by the protuberances. Theoretically, it will suillce if all of the discs produced by punches a to e had the same arrangement of protuberances and if the discs produced by punches a' to e' had, as among themselves, the same arrangement of protuberances but an arrangement different from that of discs a to e. However, in order to be on the safe side, it is preferred that each disc have an arrangement of protuberances dierent from that of all the other discs. Thus; as shown in Figure 10. each die has a different arrangement of notches, this arrangement by way of illustration, being as follows:

Die No. Notches Spacing-degrees warmem.

anblalhihblllh It is, of course, desirable and essential, unless all the discs of each series have differently spaced protuberances, to run conveyor 23 at such a speed relative to the stamping apparatus that the discs formed in any one operation will reach the conveyor 23 only after the discs of the previous operation have been moved out of the way. 'I'hat is to say, the disc formed in one operation 'by the die e' should be moved by the conveyor 23 beyond the position of the dlsc formed by the die a in the succeeding operation before the latter disc reaches the conveyor. Any suitable drive means are therefore provided to enable the conveyor 23 to be driven at a speed` related to the speed of operation of the stamping apparatus to the end that there shall be no overlapping on conveyor 23 of discs produced by successive operations.

'I'he disc produced -by die a is shown in Figures 4, 5, and 6, reference numeral 28 designating a lamination of ductile metal and 29 a lamination of fibrous material such as paper butter chip, or the like. The disc constituted by these laminations, while substantially flat, has a marginal portion 30 from which is upwardly onset slightly a central portion 3l, an annular shoulder 32 joining the two portions. At four points spaced at ninety degrees, the angle between the shoulder 32 and marginal portion 30 of the disc is bridged by protuberances 33. Each protuberance is substantially angular in cross section, that is, in a plane passing therethrough at right angles to the sectional plane of Figure 6 and the ridge line of each protuberance is substantially rectilinear. as shown in Figure 6 and extends between the shoulder and the flat marginal portion of the closure member. 'Ihis disposition of protuberances is preferred, although not essential, since upon application of the disc to the beaded mouth of the container in the manner described in my above mentioned application, the protuberances do not interfere with the capping operation and are, moreover, drawn out during the capping operation, disappearing so that smooth conformation of the disc margin to the upper external surface of the bead is secured.

In Figure 7, two stacked discs 34 and 35 are shown, the protuberance 34' of disc 34 being considered to be somewhat behind the protuberance 35' of disc 35 so that an unmutilated or undistorted portion of the annular edge 36 contacts with the protuberances 35' to maintain the discs in properly spaced relation. It is at this edge 36 that the somewhat broken condition of the fibres. above referred to, occurs.

It will be noted that preferably the height, or at least the effective height, of the protuberances is less than the height of the central offset portion of the disc. As can be seen from Figure 7, the result is that while the discs are spaced apart, their onset portions are still somewhat nested.

In Figure 11, reference numeral 37 designates a tubular container or package receiving a considerable number of discs, generally designated at 38, in stacked relation, uniform spacing of the discs being maintained by their protuberances. It will be understood that with the protuberances of each disc differently spaced from those of the adjacent disc or discs, one protuberance of one disc may register with an indentation of the superposed disc but the remaining protuberances of said one disc will serve to maintain the spacing of the discs. Preferably the spacing of the protuberances is such that each disc is supported by the subjacent disc against tilting.

Referring to Figures 8 and 9, conveyor 23 delivers to stacking mechanism 39 by means of a chute 40. 'I'he stacking mechanism comprises a pair of oppositely threaded and inwardly rotating screws 41 and 42 xed on suitably j ournaled shafts 43 and 44, the shafts having fixed thereto worm wheels 45 and 46 engaged by worms 4'? and 48 xed on a suitsmy jornaled shaft 49. snm 49 has a pulley 50 fixed on one end thereof and connected through a drive belt 51 with a motor pulley 52. In

the woll known manner, discs falling from chute l 40 have their edges gripped by the threads of screws 41 and 42 and are advanced into a. triangular stacking trough 53 at the delivery end of the screws, the discs being taken from the trough for packaging in the manner shown in Figure 11.

It will be understood that the invention is not necessarily limited as to the form of cap to which it is applicable nor to the manner of treatment of the cap to secure the spacing means. Obviously the invention is not limited as to the apparatus used in carrying it out. I do not limit myself in any o! these respects except as determined in th following claim.

I claim:

A container closure in the form of a substantially nat ductile disc having a substantially at marginal portion and a portion offset to form an annular shoulder portion inwardly oi' said marginal portion, the angle between said marginal portion and shoulder portion being bridged at widelyspaced intervals around the shoulder portion by protuberances having substantially straight ridge lines extending between the shoulder portion and marginal portion, said protuberances serving to prevent full nesting of the closure with a similar closure.

. GEORGE W. BOOTH.

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