Appeal 2007-1215
Application 10/702,724
to the closed position by a hydraulically operated control having a switching
valve, said hydraulically operated control tapping fluid pressure from
between said accumulator and said cylinder and relaying that fluid pressure
through said switching valve to an actuation side of said pilot-actuated
valve;
a reset spring on a reset side of said pilot-actuated valve biasing said
pilot-actuated valve toward said open position thereof, forming a neutral
position thereof; and
a connecting line providing fluid communication between said reset
side and a tank connection.
The Examiner relies upon the following references as evidence of
obviousness:
Runkel US 5,246,247 Sep. 21, 1993
Brandenburger (DE ‘448) DE 4,242,448 C1 Mar. 31, 1994
Wallestad US 6,578,855 B2 Jun. 17, 2003
Stanfield US 6,641,155 B2 Nov. 4, 2003
Sorum US 6,669,217 B2 Dec. 30, 2003
Appellant’s claimed invention is directed to a hydropneumatic
suspension comprising a suspension cylinder, a suspension accumulator, and
a controllable, proportional, and pilot-actuated valve which connects the
cylinder and the accumulator. When the pilot-actuated valve is in the open
position it provides fluid communication between the suspension cylinder
and the suspension accumulator. The pilot-actuated valve is movable to a
closed position by a hydraulically operated control having a switching valve,
and the control taps fluid pressure from between the accumulator and the
cylinder and relays that fluid pressure through the switching valve to the
actuation side of the pilot-actuated valve.
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