Nova Patents
CA2467039C

Can end and method for fixing the same to a can body

Abstract

A can end (22) comprising a peripheral cover hook (23), a chuck wall (24) dependent from the interior of the cover hook, an outwardly concave annular reinforcing bead (25) extending radially inwards from the chuck wall, and a central panel (26) supported by an inner portion (27) of the reinforcing bead, characterised in that, the chuck wall (24) is inclined to an axis perpendicular to the exterior of the central panel at an angle between 20.degree. and 60.degree., and the concave cross-sectional radius of flee reinforcing bead (25) is less than 0. 75 mm.

CA2467039C, drawing sheet 1
Sheet 1 of 21

Term

Term ended

Expired 25 March 2016, 10.5 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

81 claims: 34 independent, 47 dependent

  1. 1
    CA 02467039 2004-06-04 28589-20(D) CLAIMS :1. A metal can end adapted to be joined to a can body, said can end comprising: a peripheral cover hook adapted to be seamed onto a can body;a chuck wall extending inwardly and downwardly from the cover hook;an outwardly concave annular reinforcing bead extending inwardly and downwardly from the chuck wall, the reinforcing bead having an outer wall, an interior angle between said outer wall and said chuck wall being not more than 165°;and a central panel supported by and extending inwardly from the reinforcing bead;wherein, prior to being joined to said can body: (i) the location at which said chuck wall extends from said peripheral cover hook defines a first point, (ii) the location at which said reinforcing bead extends from said chuck wall defines a second point, and (iii) a line extending between the first point and the second point has a length of from 3.96 to 5.82 mm.
  2. 3
    The can end of either one of claims 1 and 2, wherein the concave reinforcing bead is approximately semicircular in cross-section.
  3. 4
    The can end of any one of claims 1 to 3, wherein the outer wall of the reinforcing bead is inclined to a line CA 02467039 2004-06-04 28589-20(D) perpendicular to the central panel of the can end at an angle between -15° and +15°.
  4. 5
    The can end of any one of claims 1 to 4, wherein the reinforcing bead has an inner wall that is parallel to the outer wall, said inner wall and said outer wall being joined by a concave radius.
  5. 6
    The can end of any one of claims 1 to 5, wherein the ratio of the diameter of the central panel to the diameter of the peripheral cover hook is 80% or less.
  6. 7
    The can end of any one of claims 1 to 6, wherein the can end is made of a laminate of thermoplastic polymer film and a sheet aluminum alloy or tinplate or electrochrome coated steel.
  7. 8
    The can end of any one of claims 1 to 7, wherein the line extending between the first point and the second point is inclined to an axis perpendicular to an exterior of the center panel at an angle of between 30° and 60°.
  8. 9
    The can end of any one of claims 1 to 7, wherein the line extending between the first point and the second point is inclined to an axis perpendicular to an exterior of the center panel at an angle of between 40° and 60°.
  9. 10
    The can end of any one of claims 1 to 7, wherein the line extending between the first point and the second point is inclined to an axis perpendicular to an exterior of the center panel at an angle of between 40° and 45°.
  10. 11
    The can end of any one of claims 1 to 7, wherein the center panel is substantially planar and defines an axis perpendicular to the plane of the center pane 1_, and wherein the line between said first and second points is inclined at CA 02467039 2004-06-04 28589-20(D) an angle of between 30° and 60° to the axis perpendicular to said plane of the central panel.
  11. 12
    Ά can end adapted to be joined to a can body, said can end comprising:a peripheral cover hook adapted to be seamed onto a can body so as to form a joint therewith;a chuck wall extending from the cover hook;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, said central panel defining a first plane;wherein, the outer wall of said annular reinforcing bead is inclined to a line perpendicular to the center panel at an angle between -15° and +15°;the concave reinforcing bead is arcuate in crosssection and has a cross-sectional radius of less than 0.75 mm;and the outer wall of said annular reinforcing bead has a height of up to 2.5 mm.
  12. 15
    The can end of any one of claims 12 to 14, wherein the concave reinforcing bead is approximately semi-circular in cross-section.
  13. 16
    The can end of any one of claims 12 to 15, wherein the ratio of the diameter of the central panel to the diameter of the peripheral cover hook is 80% or less.
  14. 17
    The can end of any one of claims 12 to 16, wherein the can end is made of a laminate of thermoplastic polymer film and a sheet aluminum alloy or tinplate or electrochrome coated steel.
  15. 18
    The can end of any one of claims 12 to 17, wherein, prior to being joined to said can body:(i) the location at which said chuck wall extends from said peripheral cover hook defines a first point, (ii) the location at which said reinforcing bead extends from said chuck wall defines a second point, and (iii) a line extending between the first point and the second point has a length of from 3.96 to 5.82 mm.
  16. 23
    A can end adapted to be joined to a can body, said can end having an overall can end diameter, said can end comprising :a peripheral cover hook adapted to be seamed onto a can body so as to form a joint therewith;a chuck wall extending from the cover hook;an outwardly concave annular reinforcing bead extending radially inwards from the chuck wall;a central panel supported by an inner portion of the reinforcing bead, said central panel having a central panel diameter;and the central panel diameter being less than or equal to 80% of the overall can end diameter.
  17. 25
    The can end of either one of claims 23 and 24, wherein the concave reinforcing bead is approximately semicircular in cross-section.
  18. 26
    The can end of any one of claims 23 to 25, wherein _ an. .outer. wall- of. the xe±n.forcing_bead- is- inclined.to - a line___ perpendicular to the central panel of the can end at an angle between -15° and +15°. CA 02467039 2004-06-04 28589-20(D)
  19. 27
    The can end of any one of claims 23 to 26, wherein the reinforcing bead has an inner wall that is parallel to the outer wall, said inner wall and said outer wall being joined by a concave radius.
  20. 28
    The can end of any one of claims 23 to 27, wherein the can end is made of a laminate of thermoplastic polymer film and a sheet aluminum alloy or tinplate or electrochrome coated steel.
  21. 29
    The can end of any one of claims 23 to 28, wherein, prior to being joined to said can body:(i) the location at which said chuck wall extends from said peripheral cover hook defines a first point, (ii) the location at which said reinforcing bead extends from said chuck wall defines a second point, and (iii) a line extending between the first point and the second.point has a length of from 3.96 to 5.82 mm.
  22. 33
    34. A metal can end adapted to be joined to a can body, said can end comprising:a peripheral cover hook adapted to be seamed onto a can body so as to form a joint therewith;a chuck wall extending inwardly and downwardly from the cover hook;an outwardly concave annular reinforcing bead extending inwardly and downwardly from the chuck wall;and a central panel supported by and extending inwardly from the reinforcing bead;wherein, prior to being joined to said can body: (i) the location at which said chuck wall extends from said peripheral cover hook defines a first point, (ii) the location at which said reinforcing bead extends from said chuck wall defines a second point, and (iii) a line extending between the first point and the second point is inclined to an axis perpendicular to the exterior of the central panel at an angle of between 30° and 60°.
  23. 36
    37. The can end of any one of claims 34 to 36, wherein the reinforcing bead comprises an outer wall that is inclined to said axis at an angle between -15° and +15°.
  24. 37
    38. The can end of any one of claims 34 to 37, wherein the reinforcing bead has inner and outer walls, a lower portion of the outer wall spaced apart from a lower portion of the inner wall by less than 1.5 mm.
  25. 38
    39. The can end of any one of claims 34 to 38, wherein the reinforcing bead has an inner wall that is parallel to the outer wall, said inner wall and said outer wall being joined by a concave radius.
  26. 39
    40. The can end of any one of claims 34 to 39, wherein the chuck wall extends between said first and second points along an essentially straight line.
  27. 40
    41. The can end of any one of claims 34 to 40, wherein the line extending between the first point and the second point is inclined to said axis at an angle between 40° and 45°.
  28. 41
    42. The can end of any one of claims 34 to 41, wherein the ratio of the diameter of the central panel to the diameter of the peripheral cover hook is 80% or less.
  29. 42
    43. The can end of any one of claims 34 to 42, wherein the can end is made of a laminate of thermoplastic polymer film and a sheet aluminum alloy or tinplate or electrochrome coated steel.
  30. 43
    44. The can end of any one of claims 34 to 42, wherein the can end is made of tinplate.
  31. 44
    45. The can end of any one of claims 34 to 42, wherein the can end is made of electrochrome coated steel. CA 02467039 2004-10-19 28589-20(D)
  32. 45
    46. A method of forming a double seam between a can body and a can end, said method comprising the steps of:a) providing a can end having a circumferentially extending peripheral curl and a wall extending circumferentially and radially inward from said curl and an annular reinforcing bead extending radially inward from said wall, said reinforcing bead having an interior surface, said peripheral curl comprising a seaming panel and a radiused portion extending from said seaming panel to said wall, said wall inclined between about 20° and about 60° with respect to an axial centerline of said can end;b) placing said curl of said can end into contact with a circumferentially extending flange of a can body;c) providing a rotatable chuck having first and second circumferentially extending walls, said first and second walls forming a juncture therebetween;bringing said chuck into engagement with said can end so that said juncture of said first and second walls of said chuck contacts said inclined wall of said can end;d) rotating said chuck;e) performing a first seaming operation by placing a first seaming roll into contact with said can end curl while rotating said can end so as to partially deform said curl and said can body flange into a partial seam, said rotation of said can end during said first seaming operation driven by said rotating chuck through driving contact between said juncture of said first and second walls of said chuck and said inclined wall of said can end without driving contact between said chuck and said can end bead interior surface;CA 02467039 2005-03-22 28589-20(D) 2 7 f) performing a second seaming operation by placing a second seaming roll into contact with said partially deformed can end curl so as to further deform said curl and said can body flange so as to further form said seam.
  33. 58
    59. A method of forming a double seam between a can body and a can end intended for use in packaging a carbonated beverage, said method comprising the steps of:a) providing a can end having (i) a circumferentially extending peripheral cover hook, said peripheral cover hook comprising a seaming panel to be formed into a portion of said double seam during a seaming operation, (ii) an annular reinforcing bead, and (iii) a circumferentially extending wall extending from said seaming panel to said reinforcing bead, said wall comprising first and second wall portions, said first wall portion to be formed into another portion of said double seam during said seaming operation, said first wall portion extending from said seaming panel to a first location on said wall and comprising a radiused portion extending from said seaming panel, said second wall portion extending from said first wall portion at said first wall location to a second location on said wall that forms a transition with said reinforcing bead, whereby said first and second locations form end points of said second wall portion, and wherein a straight line extending between said first and second locations on said wall is inclined between about 20° and about 60° with respect to an axial centerline of said can end ;b) placing said cover hook of said can end into contact with a circumferentially extending flange of a can body ;c) providing a rotatable chuck comprising a first circumferentially extending wall, said chuck first wall being substantially cylindrical;d) bringing said chuck into engagement with said can end;and CA 02467039 2004-10-19 28589-20(D) 30 e) performing said seaming operation by placing one or more seaming rolls into contact with said peripheral cover hook of said can end while said can end rotates so as to deform said seaming panel of said cover hook and said first wall portion and said can body flange into said double seam, said seaming operation deforming said first wall portion such that at least a portion of said first wall portion after seaming is substantially cylindrical, said first location on said wall after said seaming operation forming the transition from said substantially cylindrical wall portion to said second wall portion, said line between said first and second locations on said wall remaining inclined between about 20° and about 60° with respect to said axial centerline after completion of said seaming operation.
  34. 76
    77. A method of forming a double seam between a can body and a can end intended for use in packaging a carbonated beverage, said method comprising the steps of:a) providing a can end having (i) a circumferentially extending peripheral cover hook, said peripheral cover hook comprising a seaming panel to be formed into a portion of said double seam during a seaming operation and (ii) a circumferentially extending wall CA 02467039 2004-10-19 28589-20(D) comprising first and second portion, said first wall portion to be formed into another portion of said double seam during said seaming operation, said first wall portion extending from said seaming panel to a first location on said wall and comprising a radiused portion extending from said seaming panel, said second wall portion extending from said first wall portion at said first wall location on said wall to a second location on said wall, whereby said first and second locations form end points of said second wall portion, said second wall location being the lowermost point of said wall, and wherein a straight line extending between said first and second locations on said wall is inclined between about 20° and about 60° with respect to an axial centerline of said can end;b) placing said cover hook of said can end into contact with a circumferentially extending flange of a can body ;c) providing a rotatable chuck comprising a first circumferentially extending wall, said first chuck wall being substantially cylindrical;d) bringing said chuck into engagement with said can end;and e) performing said seaming operation by placing one or more seaming rolls into contact with said peripheral cover hook of said can end so as to deform said seaming panel of said cover hook and said first wall portion and said can body flange into said double seam, said first portion of said can end wall being pressed against said chuck first wall so that at least a portion of said first portion of said can end wall is bent upward through an angle of at least about 16°, said first location on said wall after said seaming operation forming the transition from CA 02467039 2004-10-19 28589-20(D) said double seam to said second wall portion, said line between said first and second locations remaining inclined between about 20° and about 60° with respect to said axial centerline .
Independent claims34