Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate
2005-07-12
2005-07-12
Omgba, Essama (Department: 3726)
Metal working
Method of mechanical manufacture
Assembling or joining
C029S509000, C029S510000, C029S511000, C029S243500, C413S004000, C413S006000, C413S026000, C413S027000, C072S379400
Reexamination Certificate
active
06915553
ABSTRACT:
Seaming apparatus and method for seaming ends to cans are described. The seaming apparatus includes a seaming chuck received by the can end. The chuck includes an anvil portion and a peripheral upper anvil wall. The upper anvil wall is inclined at an angle α of greater than or equal to 6 degrees. The seaming apparatus also includes a seaming roll having a seaming surface for engaging the peripheral curl of the can end in a seaming operation to compress the peripheral curl against the peripheral flange and the peripheral upper anvil wall of the seaming chuck. The seaming surface of the seaming roll is inclined relative to the longitudinal axis by an angle β. The value of β is selected to be greater than about 4 degrees, and more preferably from between about 8 and about 14 degrees. Additionally, the value of β bears a close approximate relationship to the value of α, and in particular the value of angle β=α±up to about 4 degrees.
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Reynolds Metals Company, Double Seam Manual, 22 pages (1971).
Forrest Randall G.
Gogola Michael R.
Turner Timothy L.
McDonnell Boehnen & Hulbert & Berghoff LLP
Omgba Essama
Rexam Beverage Can Company
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