US 1982145 A
Description (OCR text may contain errors)
Nov. 27, 1934. J. w. sHERA GLOSURE DEVICE FOR METALLIC CONTAINERS Filed May 4, 1932 2 Sheets-Sheet 1 ilnullnmrwww m m m.
Nv.27,1934. 1 w. SHERA 4 1,982,145
CLOSURE DEVICE FOR METALLIC'CONTA-INERS v Filed May 4,4 1932 2 sheets-sheet 2 4 55' forming the seal cap;
n Patented Nov. 27, 1934 CLOSURE DEVICE FOR IVIETALLIC CONTAINERS John W. Shera, Chicago, lll., assigner to American Flange & Manufacturing Company, Chicago,
Ill., a corporation of Illinois `App1ication May 4, 1932, serial No. 609,093
My invention relates generally to metallic containers such as drums, barrels, and the like, and it has to do particularly with closure means for 'the filling and/or discharge' openings thereof.
My invention is well adapted for use in connection with containers fitted for the transportation and storage of oil, gasoline and the like.
The principal object of my invention is to provide an improved, simple and inexpensive closure assembly for openings in containers of the foregoing character, which closure assembly is adapted to positively seal the container opening against leakage andis of a character which insures against undetectable tampering.
Another object is to provide a closure embodying a threaded bushing member deningthe conf tainer opening land adapted to be closed by a" gasket-carrying plug, the bushing member being provided with an angularly-disposed seat surface above its threaded part adapted to be engaged by the head oi' the plug for limiting the depth of insertion of the plug and predetermining the sealing position of the plug and its gasket.
A further object is to provide an improved and novel seal cap adapted to be securely mounted over the closure plug to conceal and render the latter inaccessible, the cap being so constructed and being so associated with its mounting that it cannot be removed without so distorting and fracturing the same that its further usefulness is destroyed.
-An additional, and more specic, object is to provide a seal cap for a closure opening dened by annular wall structure projecting outwardly from the container wall, which cap has a smooth skirt portion of -suflicient length .to extend, when secured in place, into close proximity to the container wall thereby preventing detachment or loosening o f the same by insertion o f an object,
under the free edge of its skirt, such cap being cross-scored through its top a'nd skirt to permit of removal of the same by fracturing and tearing away the scored portion.
Other objects and advantages will become apparent as this description progresses and by reference to the drawings wherein,
Figure 1 is a vertical sectional view o f one form of closure assembly embodying my invention;
Fig. 2 is an elevational view, partially in section, of the closure, illustrating the position of the seal vcap thereon prior to its securement; Fig. 3 is a separated plan view of the plug and gasket assembly shown in Fig. 2; Fig. 4 is a plan view of one form. of blank for (Cl. 22o-39) Fig. 5 is a bottom plan view of a seal cap formed from the blank of Fig. 4;
Fig. 6 is a perspective view of a modied form of cap embodying my invention;
Fig. l is a plan view of anothermodied form of a cap blank embodying -my invention; and
Fig. 8 is a perspective view of a cap formed from the blank of Fig.
Referring particularly to the structure shown in Figs. 1 to 5, inclusive, the container wall 10 is 65 provided with a circular opening deiined by an outwardly-projecting, annular flange 11 struck, preferably, from the metal of the container wall. The wall surface at the base of the flange 11 is struck outwardly providing an annular boss 12 70 forming a pocket 13 adapted to receive the horizontal flange 14 of an internally threaded bushing 15, the body 15a of which is adapted to t snugly within the flange 11. The pocket 13 and bushing flange 14 are, preferably (but not neces- 75 sarily), of octagonal shape in outline for preventing rotation of the bushing 15 within the ilange 11. To securely lx the bushing 15 to the ange 11 against-axial displacement, the upper edge of the bushing above its threads 15b is gradually 80 thinned and is extended upwardly and rolled over the outer edge of the flange 11 forming a bead 17 thereat. Any suitable sealing member or com pound 18 may be inserted between the top wall of the pocket 13 and the bushing aange 14 and, 85 with the parts secured as just described, a leakproof joint is provided as between the bushing 14, the container wall and the ange 11. 'I'he bead 17 provides at the outer edge of the container opening a rounded, angular seat above the bushing thread which is utilized in a manner which will be described more fully hereinafter.
The bushing opening is adapted to be closed by a metallic plug 19 which may be formed of any suitable material and in any desired manner to 95 the shape best shown in Figs. 1 and 3. Specically, this plug is provided with a cup-shapedbody 19 (Fig. 3) having its lower portion threaded for engagement with the bushing threads 15b, and it is further provided with a head 19b of slightly 100 larger diameter than the diameter of its threaded body portion. The surface 19c between the plug -head 19b and the threaded plug body serves to support a gasket 2 0 formed from any suitable material, such as rubber, ber, etc., with'an outside 105 diameter approximately the same as the diameter of the plug head 19h. 'Ihis gasket, as will be seen hereinafter, seals the threaded connection between the bushing 15and plug 19. The bottom portion of the surface 19c adjacent the plug no threads is approximately the same depth as the plug threads but the upper portion of the same is roundedl and is slightly deeper than the plug threads providing a well defined groove in which the gasket is retained'and compressed when the plug is screwed into closure position. Insertion and removal of the plug is facilitated by a pair of opposed lugs 19d projecting inwardly from the inner wall of the plug body (Fig. 1).
I have found that, in closure devices of the foregoing character, unless guarded against, the plug may (due to lack of proper care and skill) be screwed into the bushing beyond its desired sealing position with the result that the gasket is forced into the bushing and plug thread thereby cutting and distorting the same in such a way that the desired sealing effect is destroyed. If such a condition should exist, the usefulness of the gasket is destroyed and a new gasket must be substituted, otherwise the proper seal cannot be effected. To guard against the foregoing, and to insure (in a fool-proof manner) that the plug will always be moved to a proper andpredetermined sealing position, I relate the plug head 19h, bead seat surface 17e, gasket groove 19, and the threaded connection between the plug 19 and bushing 15 in such a way that the extent to which the plug may be screwed into the bushing is limited-to that predetermined position. wherein the gasket effects the desired positive seal against the threaded connection between the bushing and plug 19. Specifically, the width ofthe plug head 19b is such that its bottom edge strikes the irmer rounded bead seat surface 17 (Fig. 1) slightly below the top of the bead, and the plug groove 19c and gasket 20 are of such relative size that as the plug head reaches the foregoing position the gasket is fully compressed and sealed upon the bushing and plug threads forming a tight seal. Furthermore, due to the head engaging the inner rounded (downwardly and inwardly inclined) seat surface of the bead, the engagement thus effected provides a wedging-like action which further insures the tightness of the seal and aids in prevention of loosening of the plug due to vibration, shock and other causes. I
To complete the closure assembly, I employ a seal cap 21 (Figs. 1 and 2) which seats over the plug 19 with its skirt portion 21*l contracted around and behind the bead 17 and extending down along the flange 11- thereby concealing the plug 19 and rendering the same inaccessible. It is highly desirable that this seal be so constructed and applied that, once applied, it cannot be removedV and/or reapplied without detection. To this end, I provide a cap ,which cannot be removed without fracture which destroys its further usefulness. The cap can only be removed by tearing away scored sections-andV the cap skirt is so related to its supporting structure that it cannot be pried or forced outwardly from the closure structure by the insertion of an object under the free edge of its skirt. Specifically, the top of cap 21 is slightly raised so as to seat upon the plug 19.
' and its outer peripheral edge portion is slightly depressed as at 21b defining a surface which supports a gasket 22 of any suitable material. This gasket has, normally, an inside diameter approximating the outside vdiameter of the plug head'19b so that it will fit freely around the edge of the plug head and upon the top of the bead 17. The cap skirt 21* is of suchV length that when the cap is secured in place, its free edge extends into such close proximity to the surface of the boss 12 that it would be practically impossible for a person to project an object beneath such edge capable of prying loose the cap 21. Protection in this respect is further given by forming the cap skirt with asmooth surface, so that when it is secured in place it fits snugly around the flange 11 and there are no projecting parts or` surfaces which may be engaged by an object for the purpose above mentioned.
T'he cap 21,'before being secured to the closure, may take the form best shown in Figs. 2 and 5. It will be 4noted in Fig. 2 that the cap when assembled upon the closure before securement is in a somewhat raised position due mainly to the thickness of the gasket 22 which is compressed during the cap-securing operation. The cap is, preferably, secured by means of a tool of the character disclosed in the copending application of Fleck W. Sample, Serial No. 573,695. In the application of the cap by the tool just stated, the cap skirt is rst moved radially inward against the outer' rounded bead surface which translates the cap skirt movement into axial movement so that the cap skirt is contracted uniformly behind the bead 17 and into snug-fit engagement with the flange l1 throughout its circumference, as best shown in Fig. 1. During this cap-securing operation, the gasket 22 is compressed upon the top of the bead, the top of the cap is seated upon the plug v19 and a leak-proof joint is provided as between the cap and the bead 17.
By securing the cap in the foregoing manner it is so firmly fixed in place that special provision must be made for detachment of the same by the user. To that end, I may provide the top of the cap and its skirt with scored sections 23 and 24 (Figs. 4 and 5). The cap is formed from a flat blank (Fig. 4) which is provided with score lines 23* and 24a which are continuous to the edge of the blank except for skip portions 2lib and 24h, the purpose of which will be explained hereinafter. When the cap is fully formed (Fig. 5), the skip portions 23b and 24b lie in the depressed peripheral portion 21h of the cap top and immediately above the gasket 22. These skip portions insure a uniform depression of the gasket 22b when the cap is applied, thereby effecting a uniform seal around the top of the bead. To remove this particular form of cap in an authorized manner, it is only necessary to break through the scored center of the cap and tear away some or all of the scored sections, the tear being continuous down through the fr ee edge of the skirt,` the relatively small skip portions 23h and 24b not interfering with this. I have found that a cap .formed in the foregoing manner may be made from relatively'heavy gauge sheet metal which further aids in the sureness of the seal and reduces the possibility of tampering with theclosure.
'Ihe scoring of the cap top may be varied. For
example, it may take the form shown in Fig. 6'
wherein only one scored section 25 is employed, which section is identical to the section 23 or 24 of Fig. 5. I may also employ a cap scored similarly to that oi! Fig. 6 except that it is further provided with a plurality of radial score lines 27 in its skirt portion 28. Such a cap and its blank are shown in Figs. 7 and 8. The purpose of these skirt scores is to further guard against undeto detach the cap, the cap skirt would tear said flange along the scored lines 27 without detaching the cap and it would clearly show tampering. Furthermore, if the cap should be tampered with in this manner, and the. skirt portion torn, the further usefulness of the cap is destroyed.
From the foregoing, the objects and advantages of my invention hereinabove Ilrst stated will be obvious. A fool-proof, properly sealed closure is insured., Undetectabletampering is guarded against. It will be understood that while I have shown and described only two forms of my invention, other changes in details and arrangement of parts maybe made without departing from the spirit and scope of my invention as denel by the claims which follow.
l. In structure of the class described, means providing an opening in a wall of the container,
the lower or inner part of which opening is threaded and the outer part of which opening is provided vm'th an unthreaded seat tapering downwardly and inwardly from the outer edge of said opening to the top of its threaded part, a closure plug having a threaded body part adapted to engage said threaded opening and having a head of greater diameter than its threaded body part and of less diameter than the outer part of said opening and adapted to engage the tapered surface of said seat somewhat above the threaded part of said opening to limit the depth of insertion of the plug in said opening, and a readily compressible gasket carried by said plug between its head and threaded body part and adapted to be compressed against said seat below the point of engagement between said seat and plug head and above the threads of said opening.
2. In structure of the class described, means providing an opening in the Wall of the container, the lower part of the wall of said opening being v threaded and its upper part above said threads` tapering uniformly outwardly from said threads, a plug having a threaded body adapted to engage said opening threads. and a head of less diameter than the outer portion of said upper tapered part and adapted to seat against said tapered opening wall above said threaded part, said plug also having an annular groove between its threads and head of a depth equal at least to the depth of said threads, and a gasket normally of substantially the same diameter as said head mounted in said groove;
3. In structure of the class described, means including an annular flange projecting outwardly at substantially right angles from a wall of the container forming an opening therein, a bead formed at the outer end of said ange, a plug mounted in said opening, and a cap member mounted over said plug and opening-forming means with its skirt portion contracted uniformly around and over said bead and with its free edge portion extending inwardly from said bead along in substantially parallel relation throughout to the latter, said skirt being of sufficient llength to permit the same to, be contracted overand behind said bead into snug ilt engagement with said ange and to project its free edge vertically into close proximity to said container wall at the base of said flange to pre-A vent access to said free edge for detachment of the cap', and a gasket carried by said cap and seated upon said bead and adapted to be compressed upon said bead as said cap is secured in place by contracting the skirt behind said bead.
4. In structure of the class'described, means fincluding an annular ange projecting outwardly Acap is secured in place.
container to form an opening in the latter. a bead upon and surrounding the outer end of said ange, a plug in said opening and having a head, and a cap member mounted over said plug and opening-forming means with its skirt portion extending inwardly towards said container wall over said bead and along said ange in substan tially parallel relation throughout to the latter,
lsaid skirt having a portion contracted uniformlyV and snugly over said bead, and said skirt being of suflicient length that after it has thus been contracted over said bead it extends. behind said bead and is contracted into snug nt engagement with said ange with its free edge extended ver-l tically into close proximity to said container lWall at the base of said i'lange thereby preventing access to saidfree edge for detachment of the cap, and a gasket carried by said cap and surrounding said plug head and seated upon saidr bead, the same being adapted to bev compressed upon said bead and to be confined in compressed relation between said cap skirt and said plug head as said cap is secured in place by contracting the skirt thereof over, upon and behind said bead.
5.\In structure of the class described, -means forming an opening in a wall of the container which includes an outwarly extending annular flange and a bushing surrounded by said flange and turned upon the latter to provide a bead at the outer end of said flange, a plug mounted in said opening and having a head adapted to project somewhat above said bead and surrounded by the latter, a cap adapted to be mounted overr said plug and bead and having a smooth skirt wall normally of greater diameter than said bead and flange and of sufficient length when contracted-over and upon said bead and said iiange to extend its free edge to the wall of the'container at the base of said flange, said cap having the outer periphery of its top depressed somewhat below the periphery of said plug head, and a gasket supported by the depressed portion of said c ap top and adapted to be compressed upon said bead between said plug head and cap 6. In structure of the class described, an annular flange extending from a wall of the container and providing an opening, means forming a bead at the outer end of said flange, a plug closing said opening, a cap adapted to be mounted over said flange, bead and plug with its skirt portion uniformly contracted behind said bead in snug iit engagement with said flange and with the free edge of its skirt portion extending substantially into engagement with the wall of the container, a ring gasket between said bead and the top of the cap, said cap having a scored section extending across its top and down through its skirtv on opposite sides and adapted to be detached for removal of the cap, the scoring of said section lbeing interrupted at the periphery of the cap top immediately above said gasket.
7. In structure of the class described, means forming an Opening in a wall of the container with an exterior bead therearound, a plug mounted in saidopening, and a cap adapted to be mounted over said plug and bead with its skirtv is n ing threads and a gasket-receiving groove imme- -vided with internal threads extending from its inner end and terminating short of` its outer end with the outermost side of the outermost thread merging into the interior unthreaded wall of the bushing therebeyond to form a gasket seat -which is uniformly flared outwardly, a plug having a head of less widthy than the outermost diameter of said gasket seat, said plug also having a threaded body part in engagement with said bushdi'ately beneath said head, and a gasket of resilient material supported in said groove, said gasket being of such dimensions that it does not project laterally beyond said head, and upon screwing said head fully into said bushing the gasket is seated upon the outer side of the outermost of said threads and is compressed against and confined between said outermost thread, said head, said groove and the'inner wall of said bushing outwardly beyond said outermost thread, and said plug head is, at the same time. so related to said gasket seat that it is engaged with said seat inwardly of the outer end of the latter.
9. In structure of the class described, means forming an opening in the wall of a container which includes an outwardly extending' annular flange, means at the outer end of said flange forming a bead there around, a plug mounted in said opening and having a head adapted to lie within the confines of said bead being surrounded by the latter, a cap adapted to be mounted over said plug and bead and having the smooth skirt wall normally of greater diameter than said bead and flange and of sufficient length when contractedv over and upon said bead and flange to extend its free edge to the wall of the container at the base of the flange in substantially right angle relation with respect thereto, said c ap having the outer periphery of its top offset somewhat with respect to said plug head, and a gasket supported by the offset portion of said cap top and adapted to be compressed upon said bead at a point between said plug head and cap skirt wall as said cap is secured in place.
,10. A seal cap for structure of the class described which comprises a smooth top and a smooth skirt both of whichare imperforate, and a plurality of equally and i circumferentially spaced score lines in said skirt and extending throughout the length'of the latter whereby pressure applied at any point to the free edge of said skirt and axially of the cap will tend to fracture only the skirt without freeing the cap for re moval.
11. A seal cap for structure of the class described which comprises a top and a skirt portion bothof which are imperforate, an offset portion aroundthe periphery of said top portion defining a distinct and comparatively narrow gasket-supn porting surface, a scoredsection in and extending across said top portion with its opposite ends terminating at said gasket-supporting surface, and scored sections in and extending from the free edge of said skirt portion adjacent the opposite ends of said topscored section, said skirt scored sections being aligned with said top scored section and terminating at said gasketsupporting surface.
l2. A seal cap for structure of the class described which comprises atop and a skirt portion, both of which are imperforate, a comparatively narrow offset gasket-supporting surface around the periphery of said top portion, a plurality of scored vsections in and extending across said top portionat an angle to and intersecting each other, and scored sections in and extending of scored sections in said skirt portion all terminating at said gasket-supporting surface, and at least one of said skirt scored sections beingaligned with said top scored section.
14. A seal cap for structure'of the class de-` scribed which comprises a smooth top and a smooth skirt, both of which are imperforate, said top having a definitely defined and compartively narrow gasket-receiving surface formed around its periphery, a scored section extending transversely across said` top and terminating at but not passing through said gasket-receiving surface, a plurality of scored sections through the circumference of said skirt extending throughout the length of said skirt and terminating at said gasket-receiving surface, some of which latter sections are in alignment with said top scored section.
JOHN W. SHERA.