Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate
2011-04-05
2011-04-05
Chang, Rick K (Department: 3726)
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
C029S888049, C029S888050, C092S172000, C092S186000
Reexamination Certificate
active
07918022
ABSTRACT:
A method of producing a cooling channel piston for an internal combustion engine having a cooling channel in its piston crown, wherein a piston lower section with piston bosses, piston pin bores and piston skirts attach to the piston crown, wherein a piston blank is first produced with a circumferential collar radially projecting in the area of the piston crown, wherein the collar is then formed over, wherein, a seating area for the collar is formed in a transition zone between the piston crown and the piston lower section and the collar is formed over in such a way until its outer radially circumferential edge comes very close to or butts completely against the seating area to form a closed cooling channel.
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Marked-up 6,763,757.
Chang Rick K
KS Kolbenschmidt GmbH
Young & Basile
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