Source: http://www.google.com/patents/US4640733?dq=6,073,142
Timestamp: 2014-03-16 07:00:39
Document Index: 92198493

Matched Legal Cases: ['art 12', 'art 18', 'art 18', 'art 20', 'art 18', 'art 20', 'art 20', 'art 20']

Patent US4640733 - Apparatus for forming and inserting an internal lid in a container - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn apparatus for inserting an internal lid (6, 7) in a tubular formed container (1) and for sealed connections of the lid to the inner of the container tube by constant heat welding, high frequency welding or ultrasonic welding and comprising a carrier (8) for holding the container tube (1) while introducing...http://www.google.com/patents/US4640733?utm_source=gb-gplus-sharePatent US4640733 - Apparatus for forming and inserting an internal lid in a containerAdvanced Patent SearchPublication numberUS4640733 APublication typeGrantApplication numberUS 06/694,400PCT numberPCT/SE1984/000180Publication dateFeb 3, 1987Filing dateMay 19, 1984Priority dateMay 19, 1983Fee statusLapsedAlso published asCA1230003A1, DE3465453D1, EP0148205A1, EP0148205B1, WO1984004507A1Publication number06694400, 694400, PCT/1984/180, PCT/SE/1984/000180, PCT/SE/1984/00180, PCT/SE/84/000180, PCT/SE/84/00180, PCT/SE1984/000180, PCT/SE1984/00180, PCT/SE1984000180, PCT/SE198400180, PCT/SE84/000180, PCT/SE84/00180, PCT/SE84000180, PCT/SE8400180, US 4640733 A, US 4640733A, US-A-4640733, US4640733 A, US4640733AInventorsIngemar S. B. BogrenOriginal AssigneeBogren Ingemar S BExport CitationBiBTeX, EndNote, RefManPatent Citations (8), Referenced by (18), Classifications (32), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetApparatus for forming and inserting an internal lid in a containerUS 4640733 AAbstract An apparatus for inserting an internal lid (6, 7) in a tubular formed container (1) and for sealed connections of the lid to the inner of the container tube by constant heat welding, high frequency welding or ultrasonic welding and comprising a carrier (8) for holding the container tube (1) while introducing and weld connection the lid (6, 7), a support provided above the carrier (8) for positioning a plane punched out lid blank having a larger outer periphery than the inner periphery of the container tube, a piston means (16) pressing the lid blank into the container tube while folding a narrow edge rim (7) upwards from the lid plane (6) and in which the piston means comprises a lower piston part (18) and an upper piston part (20) which are axially movable in relation to each other and an expandable means (19) between said two piston parts (18, 20) which expandable means is pressed radially outwards when the two piston parts (18, 20) are compressed. The bottom of the lower piston part (18) is formed with a thin press edge (21) having an outwards-downwards sloping surface (24) which at the inner part thereof is directly succeeded by a flute (22). The upper piston part (20) which at the bottom is cup-shaped (25) is axially movable on the lower piston part (18) into and from contact with the expandable means (19). The expandable means preferably is a rubber ring (23) the form of which is changed when the upper piston part and the lower piston part are compressed, whereby the rubber ring is formed with a radially outwards directed pressure line (26) engaging the fold up lid rim (7) adjacent the very lid plane (6). The carrier (8) and the press piston (16) has substantially parallel cylindrical sides, whereby the weld pressure practically solely is provided by the expandable means (19) within area of the means (10) of the carrier for providing welding heat.
I claim: 1. Apparatus whereby an internal closure having a flat lid portion surrounded by an upwardly projecting rim portion is inserted into an upper end portion of a tubular container sleeve and whereby said rim portion is sealed to the sleeve by welding, said apparatus being of the type comprising a carrier in which a container sleeve is receivable for immobilized support, a welding ring in said carrier for surrounding said upper end portion of a sleeve therein and heating the same, and a piston means movable up and down relative to the carrier between a raised position above a sleeve in the carrier and a defined lowered position wherein the piston means is received in the carrier and at which a closure carried by the piston means has its rim portion radially opposite said welding ring, said piston means comprising coaxial upper and lower piston parts which are axially movable relative to one another and a resilient ring confined between said piston parts to be radially outwardly expanded by relative motion of said piston parts towards one another, for cooperation with the carrier in clamping the rim portion and the sleeve in tight engagement with one another, said apparatus being characterized by:A. said resilient ring being toroidal; B. said lower piston part having(1) a flat bottom surface for closely overlying the lid portion of a closure, (2) a circumferential groove which is spaced above said bottom surface and in which said resilient ring is closely received when unexpanded, and (3) an annular upper surface which is inclined downwardly and radially outwardly, into which said groove merges downwardly and which cooperates with said bottom surface to define a thin edge around the bottom of the lower piston part; C. said upper piston part having an annular lower portion with cylindrical and concentric radially inner and outer surfaces that concentrically surrounds said lower piston part above said annular upper surface thereon, said upper piston part further having an annular bottom surface with a radially inner edge and a radially outer edge at its respective junctions with said radially inner and outer surfaces(1) which annular bottom surface opposes said upper surface on the lower piston part, (2) which annular bottom surface has an arcuate cross-section profile between said inner and outer edges that substantially mates with the upper portion of the resilient ring when the same is unexpanded, and (3) which annular bottom surface has said radially outer edge at a level substantially below the level of said radially inner edge so that upon downward motion of the upper piston part relative to the lower piston part said annular bottom surface cooperates with said annular upper surface to so expand the resilient ring radially outwardly that the maximum girth thereof is in a plane which is parallel and near to said flat bottom surface and which passes through said welding ring all around the same. 2. The apparatus of claim 1 wherein said carrier has a first substantially cylindrical internal surface below said welding ring wherein a container sleeve is closely receivable, further characterized by:(1) said welding ring having a slightly conical inner surface that widens upwardly, and (2) the carrier having a second substantially cylindrical inner surface above said welding ring with a diameter equal to that of the widest part of the welding ring. 3. The apparatus of claim 2 further characterized by said carrier having a circumferential downwardly facing internal shoulder around the top of said second substantially cylindrical inner surface that defines the uppermost position of a container sleeve received therein.
The apparatus shown in FIG. 3 comprises a carrier 8 for carrying the container sleeve 1 when the lid is formed and is being weld connected to the container. The carrier 8 has substantially the same outer shape as the sleeve 1, but at the lower part it is formed with a guide cone 9 for making it easy to introduce the sleeve 1 from underneath the carrier. it is also formed with an annular welding tool 10, which is preferably a ring for transmitting high frequency heat or ultrasonic heat to the weld joint of the lid and/or the container sleeve. In order to give the part of the sleeve located above the weld tool 10 a possibility of expanding slightly during the welding operation the welding tool 10 preferably is slightly conically widened in an upward direction. The cone 11 of the welding tool 10 is very little and can hardly be observed by the naked eye, the cone angle may be between 2 welding tool and in the direction upwards the carrier 8 is widened to a parallel cylinder 12 the periphery of which coincides with the upper edge of the welding tool 10. For providing a stop edge defining the uppermost position of the container sleeve in the carrier the said widened part 12 may be formed with a shoulder.
For this purpose the lower part 18 of the press piston is formed with a very thin press edge 21 which slopes outwards-downwards as best shown in FIGS. 5 and 6. The lower part 18 also is formed with a flute around it that extends some distance radially into the lower part and the shape of which corresponds to the shape of the expandable means 19 in its non-expanded state. The expandable means is a toroidal ring 23 of rubber or any other suitable elastic material, preferably having a circular cross-section when unexpanded, and the flute 22 consequently is of circular cylindrical form. The flute 22 may be of such circumferential extent in cross section as to enclose between 90 of the rubber ring. The lower end of the flute 22 directly merges into the outwards-downwards sloping surface 24 of the press edge 21. The press edge 21 has an outer diameter which is so much less than the inner diameter of the container sleeve 1 that the lid can be pressed down in the container sleeve with an easy slip fit. The outer diameter of the press edge therefore should be less than the inner diameter of the sleeve by an amount corresponding to twice the thickness of the lid material plus a tolerance play of 0.5-1%. The upper part 20 is movable outside the lower part 18 with an easy slip fit and it should have an outer diameter which is slightly larger than the outer diameter of the press edge 21. The bottom edge of the lower part 20 is cup shaped at 25 with a size which corresponds to or is larger than the diameter of the rubber ring 23. The form of the cup shaped surface 25 should be such as to give the rubber ring 23 as low an outer pressure line 26 as possible when compressing the ring, and for this purpose the cup surface 25 is lower at the outer surface than at the inner surface of the upper piston part 20.
At previously mentioned the carrier 8 is formed with a lower guide cone 9, and the welding tool 10 has an upwardly directed cone 11 which is directly succeeded by the widened cylindrical portion 12. The cone parts of the carrier are very small. In a practical embodiment of the tool, which is intended for manufacture of a circular cup-container of cardboard having an inner diameter of 72.6 mm, the carrier is formed with a guide cone of 7 with an upwardly widened cone of 3 widened cylindrical portion of about 0.2 mm. In a practical embodiment of the invention a container was made of the same material as the sleeve and the lid, and the material was cardboard which at the surface that became the inside of the container was laminated with aluminum and a weldable polyethylene. The total thickness of the material was 0.5 mm. The container had an inner diameter of 72.6 mm and the diameter of the press edge 21 was 71.2 mm, which means a tolerance of 0.4 mm in addition to the width of twice the thickness of the material. The outer diameter of the upper part 20 was made without any tolerance and therefore has a diameter of 71.6 mm.
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