Expansible chamber devices – Piston – Open-ended hollow skirt type
Reexamination Certificate
2007-03-23
2011-12-20
Lazo, Thomas E (Department: 3745)
Expansible chamber devices
Piston
Open-ended hollow skirt type
C092S217000
Reexamination Certificate
active
08079299
ABSTRACT:
An upper part (1) of an assembled piston is disclosed, comprising a radially directed inner contact surface (2) arranged on the underside of an annular rib (15) and a radially directed outer contact surface (3) arranged on the underside of an annular wall (25), the outer (3) and the inner contact surface (2) each having a grooved profile in the form of concentric grooves with an average depth between Rz10and Rz30. The wear on the contacting surfaces of the upper piece and the lower piece of the assembled piston is thus reduced.
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International Search Report.
Geissler Christof
Messmer Dieter
Schmidt Roland
Collard & Roe P.C.
Lazo Thomas E
MAHLE International GmbH
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