Expansible chamber devices – Piston with rigid axially extending hollow stem
Reexamination Certificate
2007-06-12
2007-06-12
Leslie, Michael (Department: 3745)
Expansible chamber devices
Piston with rigid axially extending hollow stem
Reexamination Certificate
active
11206986
ABSTRACT:
A piston rod has a hollow section with an open end, a housing, and a fastening connection for a piston. The housing includes a cap welded to the open end, a tubular intermediate piece welded to the cap, and a bottom part attached to the fastening connection. The cap has a shoulder received in the intermediate piece to form an annular space which functions as a labyrinth seal to receive any weld spatters formed during the friction welding process. The outside surface of the piston rod is machined to final dimensions and surface coated following welding.
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Search Report corresponding to the European application dated Oct. 6, 2005.
Breun Wolfgang
Eberlein Ludwig
Sauer Klaus
Wilhelm Ralf
Cohen Pontani Lieberman & Pavane LLP
Leslie Michael
ZF Friedrichshafen AG
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