Receptacles – End wall structure – Joint or seam between sidewall and end wall
Patent
1997-11-21
2000-05-23
Castellano, Stephen
Receptacles
End wall structure
Joint or seam between sidewall and end wall
220620, 220906, 220623, B21D 5144
Patent
active
060656344
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an end wall for a container and more particularly but not exclusively to an end wall of a can body and a method for fixing the end wall to the can body by means of a double seam.
U.S. Pat. No. 4,093,102 (KRASKA) describes can ends comprising a peripheral cover hook, a chuck wall dependent from the interior of the cover hook, an outwardly concave annular re-inforcing bead extending radially inwards from the chuck wall and a central panel joined to an inner wall of the reinforcing bead by an annular outwardly convex bead. This can end is said to contain an internal pressure of 90 psi by virtue of the inclination or slope of the chuck wall, bead outer wall and bead inner wall to a line perpendicular to the centre panel. The chuck wall slope D.degree. is between 14.degree. and 16.degree., the outer wall slope B is less than 4.degree. and the inner wall slope C.degree. is between 10 and 16.degree. leading into the outwardly convex bead. We have discovered that improvements in metal usage can be made by increasing the slope of the chuck wall and limiting the width of the anti peaking bead.
U.S. Pat. No. 4,217,813 (KRASKA) describes an alternative design of can end in which the countersink has inner and outer flat walls, and a bottom radius which is less than three times the metal thickness. The can end has a chuck wall extending at an angle of approximately 24.degree. to the vertical. Conversely, our European Patent application EPO340955A describes a can end in which the chuck wall extends at an angle of between 12.degree. and 20.degree. to the vertical.
Our European Patent No. 0153115 describes a method of making a can end suitable for closing a can body containing a beverage such as beer or soft drinks. This can end comprises a peripheral flange or cover hook, a chuck wall dependant from the interior of the cover hook, an outwardly concave reinforcing bead extending radially inwards from the chuck wall from a thickened junction of the chuck wall with the bead, and a central panel supported by an inner portion of the reinforcing bead. Such can ends are usually formed from a prelacquered aluminum alloy such as an aluminum magnesium manganese alloy such as alloy 5182.
Our International Patent Application published no. WO93/17864 describes a can end suitable for a beverage can and formed from a laminate of aluminum/manganese alloy coated with a film of semi crystalline thermoplastic polyester. This polyester/aluminum alloy laminate permitted manufacture of a can end with a narrow, and therefore strong reinforcing bead in the cheaper aluminum manganese alloy.
These known can ends are held during double seaming by an annular flange of chuck, the flange being of a width and height to enter the anti-peaking bead. There is a risk of scuffing if this narrow annulus slips. Furthermore a narrow annular flange of the chuck is susceptible to damage.
Continuing development of a can end using less metal, whilst still permitting stacking of a filled can upon the end of another, this invention provides a can end compromising a peripheral cover hook, a chuck wall dependent from the interior of the chuck wall, an outwardly concave annular reinforcing bead extending radially inwards from the chuck wall, and a central panel supported by an inner portion of the reinforcing bead, characterised in that, the chuck wall is inclined to an axis perpendicular to the exterior of the central panel at an angle between 30.degree. and 60.degree., and the concave bead narrower than 1.5 mm (0.060"). Preferably, the angle of the chuck wall to the perpendicular is between 40.degree. and 45.degree..
In a preferred embodiment of the can end an outer wall of the reinforcing bead is inclined to a line perpendicular to the central panel at an angle between -15.degree. to +15.degree. and the height of the outer wall is up to 2.5 mm.
In one embodiment the reinforcing bead has an inner portion parallel to an outer portion jointed by said concave radius.
The ratio of the diameter of the central panel to the diameter of the peripher
REFERENCES:
patent: D279265 (1985-06-01), Turner et al.
patent: D285661 (1986-09-01), Brownbill
patent: D300608 (1989-04-01), Taylor et al.
patent: D304302 (1989-10-01), Dalli et al.
patent: D337521 (1993-07-01), McNulty
patent: D347172 (1994-05-01), Heynan et al.
patent: D352898 (1994-11-01), Vacher
patent: D406236 (1999-03-01), Brifcani et al.
patent: 3023927 (1962-03-01), Ehman
patent: 3967752 (1976-07-01), Cudzik
patent: 4015744 (1977-04-01), Brown
patent: 4024981 (1977-05-01), Brown
patent: 4148410 (1979-04-01), Brown
patent: 4150765 (1979-04-01), Mazurek
patent: 4210257 (1980-07-01), Radtke
patent: 4217843 (1980-08-01), Kraska
patent: 4276993 (1981-07-01), Hasegawa
patent: 4286728 (1981-09-01), Fraze et al.
patent: 4448322 (1984-05-01), Kraska
patent: 4606472 (1986-08-01), Taube et al.
patent: 4674649 (1987-06-01), Pavely
patent: 4681238 (1987-07-01), Sanchez
patent: 4685582 (1987-08-01), Pulciani et al.
patent: 4809861 (1989-03-01), Wilkinson et al.
patent: 4893725 (1990-01-01), Ball et al.
patent: 5064087 (1991-11-01), Koch
patent: 5129541 (1992-07-01), Voigt et al.
patent: 5494184 (1996-02-01), Noguchi et al.
Brifcani Mouayed Mamdooh
Hinton Peter James
Kysh Mark Christopher
Castellano Stephen
Crown Cork & Seal Technologies Corporation
LandOfFree
Can end and method for fixing the same to a can body does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Can end and method for fixing the same to a can body, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Can end and method for fixing the same to a can body will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1830763