Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Reexamination Certificate
2008-03-11
2008-03-11
Rinehart, Kenneth (Department: 3749)
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
Reexamination Certificate
active
07340849
ABSTRACT:
Drum in a laundry dryer, and method for fabricating the same, wherein the drum in a dryer including a steel layer which forms a base, anti-corrosive metal film on the steel layer, and an organic film on the metal film, and the method includes the steps of providing a metal sheet having a steel layer, a metal film thereon, and an organic film thereon, rolling the metal sheet into a cylinder, and welding abut joining parts, to form a cylindrical drum, reducing diameters of opposite ends of the cylindrical drum, forming beads in a middle portion of the cylindrical drum except the reduced diameter portions, and hemming opposite edges of the cylindrical drum of the reduced diameter portions, to fold the opposite edges, respectively, thereby reducing production cost significantly, preventing easy visibility of dents in an inside circumferential surface of the drum with naked eyes different from the related art, preventing occurrence of rust, and improving bonding strength of the felt which is a sealing material.
REFERENCES:
patent: 1645971 (1927-10-01), Riegel
patent: 6465114 (2002-10-01), Honda et al.
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Rinehart Kenneth
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