' Oct. 1,1946. ~ ~ |__ L, LAUVE ' ‘ 2,408,465 CONTAINER CAP » ' Filed May i, 1942 2 Sheets-Sheet 1 0a. 1, 1946. .L. L. LAUVE ' I 2,408,465 ' ‘CONTAINER CAP Filed May 1, 1942 2 Sheets-Sheet 2 \\\ \\\ \\ \\\\ \\\\ : ‘ \\\ \ \ \\\ \ \\ \ \\\\\ LguisL.Lauv,e, .; a i ,4 2,408,465 Patented Oct. 1, 1946 UNITED STATES PATENT orFicE .QQNTAINER CAP Louis L. Lauve, Baltimore, Md., assignor to ‘Crown Cork & Seal Company, Inc., Baltimore, Md., a corporation of New York I I Application May 1, 1942, Serial No. 441,357 4 Claims. (Cl. 215—38) This invention relates to container caps of the type designed for snap-on and pry-o? 'coaction with a peripheral locking ring of a container, and is an improvement on the closure of. Such type disclosed in Patent N0. 2,109,805, granted, March 1, 1938, to Robert J. Stewart. The said patent discloses, in particular, a skirted metal cap having six equi-distantly spaced iii-pressed lugs in the skirt, the internal diameter of the skirt being sufficiently greater than the maximum diameter of the container locking ring or bead so that upon application or removal of ' the cap the skirt portions intermediate the lugs 2 radial component at the lugs, with the cap ap plied, may be such that the top of the cap there above will be distorted upwardly, thereby impair ing the seal between the cap and the container lip just .above the lugs._ ' I have discovered that a cap which will afford an effective seal and willyet have satisfactory removal characteristics, results when its skirt is provided with a small number of twin lug forma tions or dents, the lugs preferably starting in, a curled edge of the skirt, running at a rather wide angle into the skirt above the curled edge, and being shaped for point contact with the locking ring when applied. The lug-s of each twin lug can flex temporarily inwardly, e.., straighten somewhat, whereby the skirt portions at the lugs 15 formation are preferably spaced as closely as possible with respect to each other without sub are enabled to flex outwardly to release the lugs jecting the skirt to destructive bending stresses in without ole-formation‘, thereof. A cap which is manufacture. By the provision of these twin lug re-usable many times with substantially original formations, each formation providing; a double locking efliciency is thus provided. 7 While the eap of the Stewart patent is entirely 2.0 point contact with the locking ring, a'cap having three such formations will, of course, have the satisfactory in use so far as sealing efficiency is concerned, the considerable number of lugs (six) same number of gripping points as a cap having renders the cap rather dif?clllt to remove,v par ticularly when the lugs are formed in the curled angular extent of the free arcs between two adja lower edge of the skirt. One, reason for this is that when the pry-oil tool is applied atany point six equi-distantly spaced lugs. However, the cent lug formations is substantially greater than that between adjacent lugs of- a six lug cap whose lugs are equidistantly- spaced, and these longer arcs can more readily flex toward the locking immediately adjacent the point of leverage appli ring in cap removal or application. As compared cation tend to be drawn under the locking ring of the container and so resist the tilting‘off of the 30 to a cap having three equi-distantly spaced single under the cap edge and leverage is exerted, lugs lugs, the lugs of the twin lug formations may be merged into the skirt at a wider angle for the facilitation of cap removal. moval and avoid lug deformation, the outward In the accompanying drawings, I have shown component of the force exerted on the cap by the I pry-on tool results in a stretching effect toward 35 two variants of the invention by way of example and the description will proceed with reference the tool which resists outward ?exing of the skirt Y to these ‘drawings in which: portion, thus opposing the outward camming of Figure 1 shows in elevation a cap in accordance the skirt portion by the lugs which are adjacent with the invention, the cap being shown as applied the tool. ' to the neck portion of a container which appears It is stated in the patent that as few as three also in elevation. lugs may be used, and while this is so in many Figure 2 is a bottom plan view of the cap of situations, a three lug cap may fail where high Figure l, internal pressures are encountered. Further, as Figure 3 is an enlarged fragmental section on to the six lug cap, it might be supposed that case line‘ 343 of Figure 2, the section including the of removal would be facilitated by easing the top adjacent portion of a container. angle of the lugs somewhat into the skirt there Figure 4 is an enlarged fragmental section on above, as compared tothe rather abrupt top angle line li—ll of Figure 2 and adjacent container disclosed in the patent. This, however, does not cap, That is to say, while the skirt portions at the lugs should ?ex outwardly to facilitate re overcome the above described tendency for the portion. ' lugs adjacent the point of leverage ‘application to 50 Figure 5 shows the parts on the section line of pull under the locking ring in resistance to the ' Figure 4, but in a different relationship. outward eammihg action enforced by the move Figure 6 is an enlarged outside fragment of the cap of Figure 1 in elevation. ment of the lugs upwardly‘ across the locking ring. Figure‘? is an, enlarged ‘inside fragment of the For another thing, if the tops of the lugs are run. upwardly into the skirt at too wide an angle, the 55 cap in Figure l in elevation. 2,408,465 3 4 Figure 8 is a view like that of Figure 4 showing a slightly modi?ed form of lug. pear in Figure 2, adjacent ends of the curves of Figure 9 is a bottom plan view of a cap in accordance with the invention with lug forma tions of modi?ed design. Figure 10 is an enlarged fragmental section on line iii-40 of Figure 9, including a portion of a container to which the cap is applied. Figure 11 is an enlarged fragmental section on line lL-H of Figure 9 and adjacent container portion. an outwardly curved portion 23’. The inclination at 33 of the lugs and the di ameter of the circle tangential to the lower ex tremities of the said portions are such that when the cap is set on the container, as in Figure 5, pressure applied to the top of the cap will cause any lug formation above the ring to be cammed readily radially outwardly as the lugs move downwardly across the ring, the uninterrupted or Figure 12 is an enlarged fragmental section on line i2—i2 of Figure 9 and adjacent container portion. unmutilated arc portions 36 of the edge 23, be tween the lug formations, straightening some what during this operation so as to avoid or Figure 13 is an enlarged outside fragment of the cap of Figure 9 in elevation. the lugs of each set being immediately joined by , ' Figure 14 is an enlarged inside fragment 0 minimize the deforming effect on the lugs. With normal tolerances, the spacing between the lock ing ring 29 and the arc portions 36 is such that when the apices 34 are on the maximum circle of the ring 29 the center portions of the arcs will ure 13. 20 not quite touch the ring. As the apices pass be The cap 20 shown in Figures 1 to 7 is formed ‘low the maximum circle of the ring the inclined portions 35 exert a camming action as the lugs of the usual resilient sheet metal and comprises a circular solid top portion 2| and a substantially and the arc portions 36 resume substantially cylindrical depending skirt 22 having at its lower their original relationship, and gasket 24 is drawn edge a continuous outwardly curled or rolled edge 25 forcibly against lip 28 so that the latter is sub stantially embedded in the gasket as shown in 23. An annular gasket 24, preferably of mate Figures 3 and 4. rial such as semi-vulcanized rubber, is adhered to the under surface of the cap top and the latter, Due to the double gripping points provided by as shown, is provided with a circular top inden each of the twin lug formations, the cap is held tation 25. Reference numeral 26 designates a 30 securely on the container, but due to the localiza container, here shown as being a glass jar, the tion of the gripping zones, and also to the rela container having a mouth 21, an angular lip 28 tively easy angle of the upper lug portions 35, adapted to engage the gasket below the circular the cap can ‘be readily removed by a prying tool indentation 25, a continuous external locking and this without danger of damaging the locking ring or bead 29, and a pry-off ledge 30 which is 35 ring. In view of the outward spacing of the cap the cap of Figure 9 in elevation, and ‘ Figure 15 is a section on line i5—l5 of Fig appropriately spaced below the edge 23 when the skirt from the locking ring, the portions 35 of cap is applied to the container as in Figures 1, 3 the lug will always be sufficient to take care of and 4. With normal tolerances, the internal di minimum tolerances in the locking ring. The ameter of the skirt is materially greater than the apices 34 should be sumciently low to permit the maximum diameter of the ring 29, as seen in 40 portionsv 35 to accommodate maximum tolerances Figure 3. of the locking ring, it, of course, being neces The skirt 22 is provided with three equi-dis sary in all cases that the portions 35 engage be low the ring for locking effect. tantly spaced twin lug formations, each of the said formations comprising two lugs 3| and 32 The angle of the upper portion 35 may be var struck inwardly in the curled edge. As seen in ied somewhat and in Figure 8 the corresponding Figure 4, for example, each lug is of generally portion 35’ has an angle of around 20°. The ?at V-section in a bisecting axial plane and has angle should not be so slight and run so far up a lower portion 33 in the curled edge inclined into the skirt as to give too much of a radial downwardly and outwardly from the apex 34 and component, since, as has been mentioned, in such an upper portion 35 inc1ined upwardly and out— 50 case the cap will tend to lift just above the lugs wardly and merging into the skirt portion above so that the seal at these points is apt to be im - paired. the curled edge at an angle of about 30°. The lower and upper portions of the lugs a?ord a It may be mentioned that Figures 1 and 2 show shoe horn eifect in the cap applying and remov a cap in a substantially exact commercial size, ing operations, respectively, easing the lugs 55 the inside diameter of the skirt being about 21/4 across the locking ring in either direction. The inches with the circumference thus slightly over circle tangent to the apices 34 of the lugs has a seven inches. The engaging points of the lugs of diameter appropriately smaller than the maxi each lug formation are substantially one-half mum diameter of the ring 29. As seen in Fig inch apart, this spacing enabling the lugs to be ures 4 and 5, the curled edge is somewhat ?at 60 formed without danger of damaging the skirt tened at the lugs, but this is merely incidental to metal. The same spacing of the twin lugs can the forming operation. be maintained in caps of larger diameter. The distance between adjacent sets of lugs is always It will be noted that the outer extremity of the edge portion 23' between the lugs 3| and 32 is at least twice the distance between the contact tangential to the outer circle of the edge 23 so 65 points of the lugs of each set. In the example that the lugs are well de?ned. Ordinarily, these shown in Figures 1 and 2 the distance between lugs are placed as closely together as is possible the lugs of each set is about 1/14 of the circum without; subjecting the skirt to destructive bend ference. ing stresses in manufacture. The lugs are sub If it is desired to space the lugs of the twin lug stantially arcuate, perhaps approaching a V, in a sectional plane normal to the cap axis so that during application to the container the lugs have line contact with the ring 29 and point contact when in ?nally applied relation. The inward curves of the lugs in the curled edge clearly ap ' formations more closely, the design shown in Fig ures 9 to 15 may be used. According to this mod i?cation, the twin lugs 31 and 38 are in effect substantially the same as before, but the portion 35 of the curled edge between the lugs terminates outwardly substantially within the outer curve of 2,408,465 , 6 5 the full arc portions 40 of the edge. Since there is less extreme bending of this portion 39 as com pared to the portion 23' of the ?rst embodiment, ' maximum diameter than the maximum inside skirt diameter when the cap is applied, said lower and upper portions affording a shoehorn effect the adjacent lugs can be substantially closer to- . in, the cap applying and removing operations re gether without danger of injury’ to the metal in 5 spectively, the distance between the contact manufacture. The lugs 25‘! and 38 are somewhat points of the lugs of each set of lugs being about sharper, i. e., more nearly of V shape, in cross one-fourteenth or less of the inside circumfer section than the lugs of the ?rst embodiment, but ence of the skirt. their contours in axial planes are substantiall 3. The combination with a container having a the same. . ‘ portion de?ning a mouth terminating in a lip, The central axial section of the intervening said portion including a rigid'continuous exter edge portions 39 is substantially as shown in Fig nal locking ring, of a snap-on and pry-o? cap including a top and a resilient substantially ure 11. As in the ?rst embodiment, there is line contact at each lug during application and point cylindrical ski-rt depending from said top and engagement with the locking ring when the cap, ‘ is fully engaged; The sealing e?‘iciency is the same as in the ?rst embodiment, the main dif ference being that the lug formations of the sec~ ond embodiment are less conspicuous and hence preferable in some situations. While with three sets of twin lugs added secu rity of seal’ is afforded as over three equi-dis tantly spaced single lugs, there is still maintained having a continuous curled bottom edge, a gas ket in said cap, said skirt being provided with three only of substantially equi-distantly spaced sets of two inwardly projecting lugs of which each , lug of each set has an upper portion which in clines gradually outwardly and upwardly relative to the inner surface of the skirt above said edge and merges into, said surface a distance above said edge and has a lower portion in said edge the desirable feature of the latter that the prying inclined gradually downwardly and outwardly off at one of the lug formations results in the relative to said inner surface, said lugs being en gaged under said ring each with point contact lifting up of more than half of the cap. . It will be understood that the invention is sus ceptible of other variations as to'form and ar rangement of parts without departure from the scope of the following claims. and with a wedging effect so that a continuing axial tension is exerted on said skirt whereby to compress said gasket between the cap top and the container lip, the internal diameter of said skirt being substantially greater than the maxi mum diameter of said locking ring, said lower and and a resilient substantially cylindrical skirt de- / upper portions affording a shoehorn effect in the pending from said top and including a continu cap applying and removing operations respective ous curled bottom edge, said skirt being provided . ~ ly, each lug having an inward curve in the plane with three only of substantially equi-distan-tly of said edge and the adjacent ends of the curves spaced sets of two inwardly projecting lugs of of the lugs of each set being immediately joined which each lug of each set has an upper portion by an outwardly curved portion of said edge, and which inclines gradually outwardly and upwardly the distance between adjacent sets of lugs being relative to the inner surface of the skirt above Iii) at least twice the distance between the contact I claim: 1. A snap-on andpry-o?f cap including a top said edge and merges into said surface a distance above said edge and has a lower portion in said edge inclined gradually downwardly and out wardly relative to said inner surface, said lugs being each engageable with point contact under a container locking ring of substantially less points of the lugs of each set. > 4. The combination with a container having a portion de?ning a mouth terminating in a lip, said portion including a rigid continuous exter 45 nal locking ring, of a snap-on and pry-off cap including a top and a resilient substantially cylin maximum diameter than the maximum inside drical skirt depending from said top and having skirt diameter when the cap is applied, said lower a continuous curled bottom edge, agasket in said and upper portions affording a shoehorn effect cap, said skirt being provided with three only of in the cap applying and removing operations re 50 substantially equi-distantly spaced sets of two in spectively, each lug having an inward curve in wardly projecting lugs of which each lug of each» the plane of said edge and the adjacent ends of set has an upper portion which inclines gradually the curves of the lugs of each set being immedi— outwardly and upwardly relative to the inner sur face of the skirt above said edge and merges into said edge, and the distance between adjacent sets 55 said surface a distance above said edge and has a ately joined by an outwardly curved portion of of lugs being at least twice the distance between lower portion in’ said edge inclined gradually the contact points of the lugs of each set. downwardly and outwardly relative to said inner 2. A snap-on and pry-off cap including a top surface, said lugs being engaged under said ring and a resilient substantially cylindrical skirt de each with point contact and with a wedging e?ect pending from said-top and including a continu 60 so that a continuing axial tension is exerted on ous curled bottom edge, said‘ skirt being pro said skirt whereby to compress said gasket be vided with three only of substantially equi-dis tween the cap top and the container lip, the in tantly spaced sets of two inwardly projecting lugs of which each lug of each set has an upper por tion which inclines gradually outwardly and up wardly relative to the inner surface of the skirt above said edge and merges into said surface a distance above said edge and has a lower portion in said edge inclined gradually downwardly and ’ outwardly relative to said inner surface, said lugs being each engageable with point contact under a container locking ring of substantially less ternal diameter of said skirt being substantially - greater than the maximum diameter of said lock ingring, said lower and upper portions affording a shoehorn effect in the cap applying and remov ing operations respectively, the distance’ between the contact points of the lugs of each set of lugs being about one-fourteenth or less of the inside circumference of the skirt. LOUIS, L; LAUVE.