US 2194147 A
Description (OCR text may contain errors)
March 19, 1940. MAUSER 2,194,147
PACKING OF A SEALING CAP FOR THE SEALING AND TIGHTENING 0F CONTAINER CLOSURES, ESPECIALLY BUNG ULOSURES Original Filed Doc. 1, 1934 2 Sheets-Sheet 1 I 3nnentor.: /7. 77762136)" 1 attorney March 19, 1940. A MAUSER 2,194,147
0 CAP FOR was ssALmq PACKING OF A SEALIN AND TIGHTENING 0F GONTAINER CLOSURES, ESPECIALLY BUNG CLOSURES Original Filod D09;- 1, 1934 2 Sheets-Shoot 2 Jnnentor:
Gttorneg Patented Mar. 19, 1940 UNITED STATES;
PATENT OFFICE CLOSURES Alfons Mauser, Marlenburg, Cologne, Germany,
' aseignor, by mesne assignments, to N.
Serlox, The Hague, Netherlands 1 Application Deoember 1, 1934, Serial No. 755,592.
Renewed December 28, 1938.
cember 21, 1933 In Brazil n 2 Claims. (Cl. 220-39) This invention relates to a packing for sealing caps for the sealing and tightening of container closures, especially bung closures, wherein the cap surrounds with its edge an annular flange 5 provided at the opening of the container and serving as an abutment.
It is known to use the cap for an'additional sealing by providing a packing between the edge of the opening and the upper part of the cap. In order to make such sealing effective, considerable pressure must be exerted on the top of the can while the edge of the cap is drawn in, by
means of a pressing tool, beneath the annular flange of the container opening, the annular flange serving as an abutment. Containers having bung closures are usually made of very thin material so that the pressure exerted on the cap leads to a deformation of the parts of the container'. Locking tools have been proposed wherein only a pressure exerted radially on the cap ment, the cap sliding downwards when drawn in against the annular flange surface which is inclined downwards. This assumption has proved to be incorrect. When the radial pressure is exerted on the edge of the cap, the upper part thereof which is stiffened by the top of the cap affords the greatest resistance so that when the flexible lower edge is drawn in, the cap slips upward instead of downward. This undesired 3 counteracting could be prevented-by abutments provided on the cap edges for the clamping jaws which effect the drawing in. However, it is necessary in connection with the sealing caps that the drawn-in cap edge bears tightly, and.without leaving a projection, against the neck of the annular flange of the opening of the container so as to preventany inducement for an unauthorized manipulation of the sealing cap. Consequently, in connection with such a sealing method of the sealing ca-p, the-exertion of considerable axial pressure on the cap cover when locking the same is unavoidable if the scaling is to be eflfective. In such cases, as for instance in bung closures, wherein the packing by the abovedescribed cap sealing method cannot take place directly upon the body of the container, the additional sealing eflect does not take place. Fl-
nally, the tightening is greatly affected by the upper part of the annular flange being :damaged which easily occurs for ObViQllS reasons.
The aforesaid drawbacks are obviated by the present invention. According to the invention, the sealing cap is provided in the interior of the edge to be drawn in with a compressible lining 'edge must cause the cap to make an axial moveor covering of cork, rubber, asbestos or the like, or the outwardly extending part of the closure opening is provided therewith. Band-like material prepared from waste atflow cost may be used for the aforesaid sealing, or a homogeneous or adhesive applying of the packing material may take place. The sealing cap provided with such a packing effects byonly a lateral pressure exertion on the edge to be drawn in an absolutely reliable sealing against the annular flange and collar of the closure opening. Cons'equently, the previously 'requisite simultaneous exertion of an axial pressure on the cap is dispensed with. The sealing thus acts all the more favorably since the lateral faces of the projecting edge of the closure are not subjected'to any possibilities of being damaged. The thickness [of the packing may be comparatively small. owing to the possibility of exerting a strong lateral pressure. If necessary the entiresealing cap may be lined with a compressible packing material and a suitably preliminarily pressed cap of packing material maybe inserted in the sealing cap. There results therefrom the possibility of providing a packing along the entire outer part of the closure edge, including the upper part of the annular flange of the container closure, since the locking tool is provided with means which, when drawing in the edge of the cap, presses the cap cover against the annular flange and prevents an escape of the cap upwards. This fact complies with the desire to use the sealing cap as sealing means and as the sole packing means. The omission of the usual sealing means as for instance bung plugs with packing results in a great saving in the cost price of the closure.
The lateral arrangement of the packing allows of the notch lines being extended over the edge of the sealing cap without the sealing being thereby affected. The removal of the cap at the opening of the closure is thereby greatly facilitated because the remaining portion of the edge can be pulled through without any difliculty. It is thus also possible to make the cap of thicker material.
A further essential advantage is obtained with the invention by simplifying the sealing of the closure. For instance, in bung closures, the pack-- ing, which is' provided externally and laterallyaround the collar of the outwardly extending flange of the container is so proportioned that it" also surrounds the edge of the annular flange of the event of using an ordinary packing ring or z gasket of flat rubber which is smaller in diameter than the outwardly extending annular flange, the packing ring will automatically fit tightly around the annular flange inwardly when the packing ring is stretched around the collar of the container flange. The bung plug may be directly screwed in and the sealing cap mounted thereon. A further substantial saving in the cost price results from the omission of the special bung plug packing.
With reference to the accompanying drawings, some constructional forms of the invention are shown therein.
Figure I shows a bung closure, wherein a bung bush b, externally surrounded by the body of the container, is provided with an annular flange which projects outwardly in the upper part. The closure is effected by the packing d and by the bung 0 adapted to be screwed in the bung bush. The cap packing e is placed around the receding neck of the opening edge b. The sealing cap I is loosely slipped over the sealing means and not yet flanged.
Figure II shows the same bung closure as Figure I, the edge of the sealing cap f being drawn in through the jaws g of the locking tool and tightly pressed against the packing e. When tightening the edge of the cap, a holding memher h of the locking tool bears on the sealing cap I and prevents the same from sliding upward. The cap bears on the bung plug 0 whereby the sealing of the sealing cap 1 against the outwardly inclined and upwardly rising flange edge becomes effective. The lower edge of the sealing cap is pressed tightly against the collar of the opening edge so that unauthorized manipulations by means of a tool are prevented. The arrangement of the packing, e on the flange of the container allows of the packing being used several times.
Figures III and IV show the same closure as Figures I and II. The packing e is provided in the collar edge of the sealing cap f. Figure III shows the sealing cap before the tightening of the edge while Figure IV shows the ready mounted and sealed cap I.
In the constructional form according to Figure V, the sealing cap I is completely lined with a packing material or a complete packing cap 1. The packing is effected on the entire outer part of the opening edge including the upper part of the annular flange N. This efiective sealing by means of the sealing cap eventually dispenses with the insertion of a hung plug or the like.
Figure V also shows another form of the bung bush securing means. The packing of the sealing cap 1 against the body a of the container is only rendered possible in such a bung closure by the arrangement of the cap packing e, i according to the invention.
The constructional form according to Figure VI differs from that of Figure V in that the opening edge is formed with the annular flange b of the material a of the container. This is a simplifled form of the closure wherein the sealing cap serves simultaneously as sealing means and locking means. V
Figure VII is a plan view of the closure with extends over the annular flange b so that it is 10 used simultaneously as cap packing and bung plug packing. Figure VIII shows how the cylindrical packing ring e of flat rubber, which is smaller in diameter than the annular flange b bears tightly around the annular flange b 15 inwardly when the packing ring is stretched around the collar b of the bung. Figure IX shows the closure according to Figure VIII with screwed in bung c and ready mounted sealing cap I. It is shown in Figures X and In as compared with the illustration in Figures VIII and IX how a flat or conical packing ring disk e adapted to the bung packing surface can be used instead of a cylindrical packing ring ea. It is obvious from Figure X how the outwardly ex- 25 tending annular disk e is pressed downward by the sealing cap I and placed around the annular flange 12 Figure XI shows the completely sealed closure with the mounted sealing cap 1 and packing e pressed thereon.
It is obvious that instead oi. the rubber packings e and e indicated by way of example, packings consisting of other compressible material may also be used. The packings may also be preliminarily pressed in a form adapted to the annular form.
1. In a structure of the class described, a container having a wall and an opening therein, a
flange surrounding said opening having a sub- 40 stantially annular external surface and an outer edge, a sealing cap applied over said flange and having a skirt portion surrounding the'latter, a closure plug fltted in said opening, and a compressible packing member interposed between the I skirt of said cap and the external surface or said flange and extending inwardly around the edge of the latter and being interposed between said edge and said plug thereby forming a seal between said plug and said flange and between said I0 flange and said skirt.
2. In a structure of the class described, a container having a wall and an opening therein, a flange surrounding said opening and constituted by said wall, said flange having a substantially ll annular external surface and an outer edge, a sealing cap applied over said flange and having a skirt portion surrounding the latter, a closure plug fitted in said opening, and a compressible packing member interposed between the skirt of 00 said cap and the external surface of said flange and extending inwardly around the edge of the latter and being interposed between said edge and said plug thereby forming a seal between said plug and said flange and between said 68 flange and said skirt.