Appeal No. 2005-1727
Application No. 09/925,013
receiving housing 3, away from the piston 1 in a chain
tensioning direction, whereas force pulses from the chain
cause the tensioner housing 2 to retract against the
action of the compression spring 13 into the tensioner
housing 2, over the piston 1. The non-return valve 7 with
a ball as a closing member can open during the extension
of the tensioner housing 2 and is closed during
retraction. The hydraulic oil contained in the high
pressure chamber 8 flows out of the tensioner housing 2
through a leak gap 14 between the piston 1 and the
tensioner housing 2 during retraction. This pressing-out
of hydraulic oil from the high pressure chamber 8 of the
tensioner housing 2 is accompanied by a high fluid
friction and thus has a damping effect on the chain to be
tensioned which transmits its force pulses to the
tensioner housing 2 [column 3, line 40, through column 4,
line 17].
In applying Stief against independent claim 1 (see pages 3 and
4 in the answer), the examiner reads the claim limitations relating
to the piston, cylinder, pressure chamber and control member on
Stief’s tensioner housing 2, receiving housing 3, pressure chamber
8 and non-return valve 7, respectively. As for the leakage gap
5
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Last modified: November 3, 2007