US2050799A - Closure cap - Google Patents

Description

Aug. 141, 1936. rR. LANDAU cLosiJRE CAP Filed April 1, 1952 Patented Aug. 11, 1.936

UNITED SAES Application April 1, 1932, Serial No. 602,602 In Sweden August 20, 1931 1 Claim.

This invention relates to a closure cap of elastic material the rim of which is so subdivided by contacting or bearing elements Vinto spring segments that these latter are stretchedby the forcing of the cap on to-the mouth of the vessel to be closed, and are' thereby rmly pressed for a portion of their length against the side of the said mouth. Closure caps of this type are already known in which the contacting or bearing elements provided between the spring segments of the rim are formed by depressions in the said rim. These depressions; however, have hitherto been in the form either of pointed indentations or of grooves on longitudinal generatrices of the rim, and in either case have only extended over a portion of the part of the rim above the margin to be bent inwards about the neck of the Vessel to be capped. The portions of the rim thus left free both above and below the depressions become deformed during the application of the cap, and render the subsequent removal of the same difficult. Since, further, caps of this type can be removed and replaced without leaving any visible indication of such removal and replacement these caps cannot be used as a guarantee that the contents of vessels closed by them are genuine and unadulterated.

The closure cap provided by the present invention overcomes the rst-mentioned drawback by having longitudinal indentations which preferably commence at the head of the cap and extend as far as the marginal portion to be bent inwards, thus forming stiening ribs extending over the entire width of the rim proper. These ribs are capable of withstanding any tendency to become deformed, and serve, both during the application and the removal of the cap, as guides or runners for the movement of the cap relatively to the vessel; In order that the cap may also act as g a safeguard against misuse the marginal portion of the rim is provided with dividing lines or marks which do not destroy the unity of this portion during the original application of the cap, but which become torn open by the removal of 5 the cap and thus, in conjunction with a hollowing in of the head of the cap produced by the action of the closing implement, clearly distinguishes the cap as having been already used, without, however, rendering the cap unfit for further use; on the contrary, after the first removal the cap can be employed as often as desired for temporarily closing a vessel the contents of which have only partly been used, or for any other purpose. These dividing lines or marks are preferably arranged as continuations of the above described indentations, so that, in the first place, these indentations may prevent the undesired tearing of the rim beyond the ends of these marks, and, in the second place, the tongues or segments of the marginal portion thus formed may 5 participate in the pressing-on of the rim segments eiected inthe described manner by the provision of the indentations in the` main portion of the rim.

Two forms of construction embodying the inl0 vention are illustrated, by way of example, in the accompanying drawing, in Which:-

Fig. 1 shows the closure `cap attached to the neck of a vessel, in section on the line I--I of Fig. 2. l5

Fig. 2 shows the same form of cap in perspective.

Fig. 3 shows a modied cap, in elevation and part section.

Referring to the drawing, the closure cap shown in Figs. 1 and 2 consists in a known manner of a head a and a cylindrical rim b the diameter' of which is preferably somewhat larger than the outside diameter of the thickened orifice c of the vessel d to be closed. In the periphery of the rim b there are impressed at equal distances indentations f which preferably proceed directly from the head of the cap a and extend to the marginal portion e of the flange b to be bent inwards. These indentations follow longitudinal generatrices of the rim b, and form inwardly projecting stiffening ribs. This shaping of the cap makes 'it possible for the cap to be manufactured with the indentations f in a single operation. For the purpose of obtaining gas-tight closure there are provided in the head a of the cap a layer g of oiled or parchment paper and a cork disc h.

On the application of the closure cap to the vessel d by means of pressure exerted upon the 4o head a of the cap the stiening ribs formed of the indentations f, each diametrically opposed pair of which are slightly less widely spaced apart than the diameter of the head c of the vessel, are y automatically forced apart radially in a known manner, so that the middle portion of the segments between the indentations f are stretched and thereby pressed against the head c of the vessel. The stiii'ening ribs f extending over the entire .x width o f the rim b up to the marginal portion take vup, without any deformation, all strains occurring both in a-.longitudinal and in a transverse direction, and thus act as guides or runners which facilitate the application, and more particularly the removal, of the closure cap. If the closure cap be employed in connection with a vessel oriiice c which is not circularly cylindrical but, for lnstance, conical the stiflening ribs f will rock outwards in the manner of one-armed levers about the cap head as a pivot, and thus adapt the clolsure cap to the shape of the orifice, without impairing the eiectiveness of these ribs as guides or runners for the movement of the cap. In the event of the indentations f being made to proceed right from -the head a of the cap these indentations can be made with the closure cap in a single operation.

In the modified form of the cap shown in Fig. 3 there is provided in the marginal portion e be- ,neath each ot the indentations f a dividing mark l produced by weakening of the material, a narrow web k being preferably left between each indentation and mark. During the original mechanical application of the closure cap the marginal portion e forms a continuous encircling jacket which, after having been bent into engagement with the construction immediately following the thickened portion of the neck c of the vessel to be closed, firmly secures the cap to the vessel. When the closure cap is removed with the aid of a suitable implement the crimped margin e is so subjected to tensile strain,`both by the direct action of the said implement and by the drawing of this marginal portion over the thickened neck c of the vessel, that this marginal portion e is torn apart where the'resistance is least, namely, along the dividing marks I. This tearing is eiiected in practice only throughout the length of these dividing marks l, and possibly across the web lc, since the resistance of the upper, main portion of the rim is very considerably increased by the arch-shaped stiitening ribs f. The closure cap which is thus distinguished as having been already used, as also by the bending in of the head a by the action of the sealing tool, is thus capable of serving as a safeguard against adulteration of the contents o! the vessel. and is at the margin are caused to participate in the radial 1 compression of the spring segments of the main portion of the cap rim eiected in the described manner by the stiifening ribs f.

The dividing marks l can equally well be provided at any desired points intermediate the 1 grooves f, or can be replaced by incisions.

I claim:

A closure cap made from material possessing elasticity, for application to the mouth of a receptacle having a beaded neck portion, comprising 2 in combination a substantially disc-shaped head, a normally cylindrical ange depending from the extreme outer edge of the said head, the inside circumference of the said ange being greater than the outside circumference of the said neck portion of the receptacle, a marginal portion on the said flange adapted to be crimped into engagement beneath the beading on the said neck portion, inwardly impressed longitudinal channels in the said ilange extending continuously from the o said head to the commencement of the said marginal portion. said channels being provided at and through the said head so that they are openended at the top, the circle inscribed within the said channels being smaller than the outside ciro cumference of the said neck portion of the receptacle, and the said marginal portion being at least partly cut through longitudinally at intervals round its periphery from the lower edge upwards for a distance amounting at the most to the width o! the said marginal portion.

ROBERT LANDAU.

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