Patent GB-1092915-A (GB)
Title: Improvements in closure for barrels, drums, pails and like containers
IPC: B65D47/12
Filed: 1965-03-16
Abstract: 1,092,915. Container closures; bunghole bushes; stoppers. TECHS Inc. March 16, 1965 [Dec. 31, 1964], No. 11188/65. Heading B8T. A closure for a barrel, drum, &c. comprises a resilient sealing member 28 having an annular skirt engaging a flange 22 on the barrel opening and a central cylinder attached to the skirt by an initially upwardly extending ring 34 decreasing in thickness to a thin flexible portion 32a at the junction with the skirt, a V-shaped groove 37 being formed in the top of the central cylinder which has a bore 38; and a screw threaded closure plug 42 engaging threads 30a on the annular skirt, a central boss 42a on the closure plug abutting against a boss 36 on the sealing member thereby pushing it down so that the thin flexible portion forms a seal with the flange on the barrel opening and the V-shaped groove closing so that the ring lies in a horizontal plane. Prior to inserting the closure device in the barrel opening a tap is screwed into threads 36a in the lower part of a bore 38 in the boss 36. The tap may be retrieved by gripping a fin 41 on a membrane 40 to remove the sealing member 28 from the barrel opening. Recesses 43, enable the sealing member 28 to be removed by a tool if the membrane 40 and fin 41 have been broken off. When the closure plug 42 is screwed down on to the sealing member 28, the part 32a<SP>1</SP> of the flexible portion 32a is pushed outwards thereby gripping the barrel opening below the flange 22 and forming a seal. Additionally an outer annular boss 42b on the closure plug 42 compresses the internally threaded wall 32 of the sealing member 28 against the upper shoulder 26 of the inwardly lipped portion of the flange 22 to form a second seal. By pressing against the ring 34 the boss 42b also prevents internal pressure in the barrel releasing the seal formed by the part 32a<SP>1</SP> of the flexible portion 32a. A plug 42d is screwed into the boss 42a but may be unscrewed by gripping a cross web 42e and replaced by the tap after the membranes 40, 42a<SP>1</SP> have first been ruptured. Lugs 42c enable the closure plug 42 to be removed by a spanner wrench. A metal, polythene, &c. cap 44 with a tear strip may be placed over the closure device and made removable only by being destroyed. A neck liner may be placed between the flange 22 and the sealing member 28. In a modification, Figs. 5, 6 (not shown), a sealing member (55) is formed with external threads (58) and a central cylindrical boss 62 has annular rings 63a, 63b, 63c of semicircular cross-section formed on its inner wall 63. A pouring spout 65 has an upper outwardly extending flange 65a which seats on the upper end 62a of the boss 62 when a cap 70 is screwed down on to the sealing member 55. A thin flexible portion 60 of the sealing member 55 is forced outwards and seals under a lip 51 of the flange 50 in the barrel opening. To discharge the barrel contents, the cap 70 is unscrewed by grasping serrations 73 on its outside and a membrane 65c in the top of the spout 65 is punched out around its line of weakness 65d. The wall of the spout 65 fits tightly against the annular rings 63a, 63b, 63c and a flange 65b on the lower end of the spout prevents its complete removal from the sealing member 55.