Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Reexamination Certificate
2008-09-02
2008-09-02
Schwartz, Christopher P (Department: 3683)
Spring devices
Vehicle
Mechanical spring and nonresilient retarder
C267S141000, C213S03200A
Reexamination Certificate
active
10455857
ABSTRACT:
A friction damper comprises a channel member including at least one friction channel and a wedge member including at least one friction wedge received by a corresponding friction channel for sliding motion along the channel relative to the channel member. Each friction channel has a pair of internal sidewalls connected by an internal transverse wall, wherein at least one of the pair of sidewalls forms an obtuse angle with the transverse wall. In a preferred construction, the sidewalls are symmetrically convergent as they approach the connecting transverse wall. Each friction wedge includes a pair of external sidewalls parallel to the internal sidewalls of the channel, wherein the external sidewalls of the friction wedge are movable into surface-to-surface engagement with the internal sidewalls of the friction channel by adjusting the depth of receipt of the friction wedge in the friction channel. The friction damper of the present invention makes it possible to increase the equivalent friction coefficient by a factor of up to ten to twenty times.
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Lee George C.
Liang Zach
Hodgson & Russ LLP
Schwartz Christopher P
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