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APYH 19, 1965 T. <5. w. BRACKMANN ETAL 3,245,792
PLASTIC COVER FOR PRESS-—IN COVER CANS Filed Sept. 18, 1963 3 Sheets-Sheet 2
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April 19, 1955 T. e. w. BRACKMANN ETAL 3,246,792
PLASTIC COVER FOR PRE5S—IN COVER CANS
Filed Sept. 18, 1963 3 Sheets-Sheet 5
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INVENTORS THEODOR GERHHRD umu BRACKMANN (13. EBERHARD S\EGFR\ED UEBERT
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3,246,7 92 PLASTIC COVER FOR PRESS-IN COVER CANS Theodor Gerhard Willi Brackmann, Braunschweig, and Eberhard Siegfried Liebert, Hamburg-Bergedorf, Germany, assignors to J. A. Schmalback Aktiengesellschaft, Bi-aunschweig, Germany Filed Sept. 18, 1963, Ser. No. 309,686 Claims priority, application Germany, Sept."20, 1962, Sch 32, 6 13 Claims. (Cl. 220-31)
This invention concerns a plastic cover for press-in cover cans.
It is known in the manufacture of containers in the form of cans or the like of various materials, such as sheet metal, pasteboard or even from plastic, to provide the containers With press-in covers, and fit the same with a cover, which likewise consists of plastic. Such press-in covers consisting of plastic are used, in particular, for coffee cans, tea cans or the like, from which the contents are to be taken each time in portions, importance being attached to the tight sealing of the container. The plastic cover, because of its nature of being readily deformable, can be put on and removed without the exertion of great force.
In containers intended for -receiving contents to be removed in portions, it is desirable that the plastic cover not only be easily put on and removed, but also that it be so attached to the container that it may not be laid aside as a detached part each time the container is opened. On the other hand, the cover should not, after opening, hinder access to the inside of the container.
The problem sought to be solved by this invention is that of designing a plastic cover for press-in cans, so that it meets the above mentioned requirements. '
In the solution of this problem, the herein disclosed invention provides that the press-in part of the cover is connected with a cover rim to be fastened to the cover ring of the can, through at least one hinge strip, and has at least one projecting tongue or flap means close to the hinge strip, which, when the cover is raised or opened, is supported on the cover ring of the can, holding the cover in the open position. p
By this new design of the plastic cover, the end is gained that the cover is joined in hinged fashion to the cover rim fastened on the cover ring of the can, the tongue or flap means serving by its support on the cover ring when the cover is in the open or raised position, to oppose the tendency of the elastic hinge strips to bring the cover back to the closed position, thereby to hold the cover in the open position.
The tongue or flap means in its projecting length is so designed that in the raising or opening movement of the cover, with slight elastic deformation through bending of its free end, said flap means is placed against the cover ring in the zone of the opening rim in position to be supported there or against the cover ring. In the closing movement of the cover, the tongue or flap means is conversely brought -back again into the original position, without hindering the closing process.
Preferably, two spaced hinge strips with a tongue or flap between them are provided, since in this way the cover, even in the open position, is held secure against
twisting movements and only one tongue or flap is needed. '
However, it is quite possible to arrange between the press-in part of the cover and its rim just one hinged strip, and on each side of this hinged strip, a tongue or flap means, through which the cover may be properly supported in the open position.
To increase the supporting effect of the projecting flap or flaps, this invention also provides that the flapiis reinforced as compared with the rest of the cover parts, or Provided with ribs to increase resistance to bending.
A sure release of the opening rim of the cover ring is obtained, also, if cans are used on which the cover ring has somewhat the shape of a reclining S, and if, according to this invention, the hinged strip or strips are designed longer than cor-responds to the distance between the press-in part and the rim of the cover, so that in the closed condition of the can, the hinged strips, laid together or in fold-like relation, are received in the circular depression which is formed ‘by the cover ring and wherein, when the can is opened, the tongue or flap means are supported.
The secure and perfect opening and closing of the container by -means of the press-in cover requires that the cover rim be securely joined with the cover ring so that the latter cannot fall away as a separate part and be lost. In cans or other containers which have a removal opening much smaller than the end surface, it is recommended that the cover rim of the press-in cover be joined with the cover ring through the medium of pressure knob means, for in such an arrangement only a relatively narrow cover rim on one side is necessary, the same being supported on the cover ring.
In an-other form of the invention, it is provided that the cover rim grips over the whole circumference of the can and is equipped with a stacking flange.
The cover may also be designed to constitute a safety or tamper-proof closure, if according to a further feature of the invention, the press-in part is connected with the cover rim not only by at least one hinge strip but also by one or more stays distributed around the circumference and which are readily rupturable in the first opening. These stays may be formed without difliculty in the production of the cover, so that no additional working step is required in forming the cover as a safety closure.
With the above and other objects in view that will hereinafter appear, the nature of the invention will -be more clearly understood by reference to the following detailed description, the appended claims and the several views illustrated in the accompanying drawings.
In the drawings:
FIGURE 1 shows a section through the upper part of a can, oblong in general cross section, with a press-in cover designed according to the invention, and in which the access opening extends over only a part of the cross section area.
FIGURE 2 shows a top view of the cover according to ‘F-IGURE 1.
FIGURE 3 shows an enlarged fragmentary section along the line III—III in FIGURE 2. *
FIGURES 4 and 5 show the arrangement according to
FIGURES 1 to 3, in ditierent opening positions of the.
FIGURES 6 t-o 8 show, in a representation corre-I
sponding generally to that of FIGURES 1 to 5, another modified form and arrangement of the cover and the oblong can, in which FIGURES 7A, 7B and 8 correspond generally to FIGURES 3, 4 and 5, respectively.
FIGURE 9 shows an enlarged radial section through the upper part of a can with a cover, equipped with lliinged strips different in design from those of FIGURES
FIGURE 10 is a fragmentary plan view showing the parts illustrated in FIGURE 9.
FIGURE 11 is a plan view illustrating another form of the invention designed for the closing of cans with round cross section.
FIGURES 12 and 13 show sections through the closure arrangement shown in FIGURE 11, the sections being taken on the lines XII——XII and XIII-—XIII, respectively.
In all of the figures, 1 is the jacket or body of the can, to which the cover ring 2 is seam-secured or applied in other known manner. The press-in part of the cover