Patent GB-824039-A (GB)
Title: Improvements in and relating to collapsible containers
IPC: B65D3/10
Filed: 1957-05-10
Abstract: 824,039. Portable containers ; cartons ; closures. FEDERAL PAPER BOARD CO. Inc. May 10, 1957 [May 24, 1956; Nov. 5, 1956; March 11, 1957], No. 14908/57. Classes 18, 66 and 125(3). A closed end construction for a collapsible container and/or for a collapsible lid for a container, comprises at the said closed end a plurality of inwardly extending flanges which together support an end closure, each flange comprising two fingers connected to each other, one also being connected to the main or body portion of the container or lid and the other to a continuous marginal band which extends from the closed end and is in engagement with a surface of the body portion, one of the two fingers of each flange being shorter than the other and providing direct support for the end closure, whilst the longer fingers serve to brace the short fingers. Fig. 1 shows a typical blank for making a cylindrical container having a closed bottom end formed according to the invention. The blank has scored lines 32, 34, 36, 43 and 44 thereon and apertures 38 punched therein, the material between each adjacent pair of apertures and between the scored lines 32, 36 constituting a connected pair of fingers 33, 35. The blank is folded as in Fig. 4 so that the fingers of each pair abut one another and lie alongside the main body portion 31 of the blank. At the same time, and as indicated by the dotted lines in Fig. 4, marginal bands 37, 42 at opposite ends of the blank are folded over and glued in position against the body portion 31. The side margins of the blank are then folded over and joined to form a container 48 shown in Fig. 6 in a collapsed condition suitable for storage or shipment in bulk. When the container of Fig. 6 is opened out to a cylindrical shape the flanges 49 formed by the fingers 33, 35 take up an initial position shown as shown in Fig. 8 and are moved to a substantially flat condition shown in Fig. 10 when a closure disc 51 is pressed downwardly into position. The marginal flange 37 to which the fingers 35 are connected may slidably embrace the outer surface of the container wall 31 as shown in Fig. 10 or it may be slidable within the wall 31, Fig. 14 (not shown), and to ensure proper positioning of the disc-supporting flanges the marginal flange may abut, in the case of a relatively shallow container 59 shown in Fig. 20, a marginal band 61 at the top end of the container, or alternatively, abutment lugs 89, Fig. 24, may be provided, the lugs 89 being excised from the material of the fingers adjacent their interconnection with the container body portion (see Fig. 22 not shown). Adjacent disc-supporting flanges may abut one another at their ends or their adjacent ends may telescope into one another, Fig. 34 (not shown). End constructions formed according to the invention may be provided at both ends of a container or at one end of the container and /or in a detachable lid for the container (see e.g. Fig. 24). Flexible cardboard is mentioned as a suitable material and it is stated that containers embodying the invention may be of any desired shape such as oval or conical, and may be capable of being nested in their erected condition.