Title:
DUAL SPRING RATE DAMPER
Document Type and Number:
WIPO Patent Application WO2005021990
Kind Code:
A3
Abstract:
A damper has a piston having an axis, an outer surface, and opposing ends. Elastomeric seals are in sealing contact with the outer surface of the piston, the seals being coaxial with the piston and limiting movement of the piston to a path along the axis of the piston. The seals also define fluid chambers adjacent the ends of the piston. A primary passage communicates the fluid chambers, and a selectively switchable valve for controls a flow of fluid from one of the chambers to another of the chambers through the primary passage. When the flow of fluid through the primary passage is permitted, movement of the piston is resisted by a first spring rate due to a shear force required to cause shear deflection of the seals. When the flow of fluid through the primary passage is restricted, movement of the piston is resisted by a second spring rate due to a fluid force required to cause bulging deflection of the seals.
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Inventors:
STAMPS FRANK B (US)
SMITH MICHAEL R (US)
BOTHWELL CHRISTOPHER M (US)
CORSO LAWRENCE M (US)
BRASWELL JAMES L JR (US)
POPELKA DAVID A (US)
SCHELLHASE ERNST C (US)
HOLLIMON CHARLES L (US)
NEWMAN THOMAS J (US)
BASKIN BRYAN (US)
CAMPBELL THOMAS C (US)
ROBERTSON DANIEL B (US)
SMITH MICHAEL R (US)
BOTHWELL CHRISTOPHER M (US)
CORSO LAWRENCE M (US)
BRASWELL JAMES L JR (US)
POPELKA DAVID A (US)
SCHELLHASE ERNST C (US)
HOLLIMON CHARLES L (US)
NEWMAN THOMAS J (US)
BASKIN BRYAN (US)
CAMPBELL THOMAS C (US)
ROBERTSON DANIEL B (US)
Application Number:
PCT/US2004/027964
Publication Date:
May 12, 2005
Filing Date:
August 27, 2004
Export Citation:
Assignee:
BELL HELICOPTER TEXTRON INC (US)
STAMPS FRANK B (US)
SMITH MICHAEL R (US)
BOTHWELL CHRISTOPHER M (US)
CORSO LAWRENCE M (US)
BRASWELL JAMES L JR (US)
POPELKA DAVID A (US)
SCHELLHASE ERNST C (US)
HOLLIMON CHARLES L (US)
NEWMAN THOMAS J (US)
BASKIN BRYAN (US)
CAMPBELL THOMAS C (US)
ROBERTSON DANIEL B (US)
STAMPS FRANK B (US)
SMITH MICHAEL R (US)
BOTHWELL CHRISTOPHER M (US)
CORSO LAWRENCE M (US)
BRASWELL JAMES L JR (US)
POPELKA DAVID A (US)
SCHELLHASE ERNST C (US)
HOLLIMON CHARLES L (US)
NEWMAN THOMAS J (US)
BASKIN BRYAN (US)
CAMPBELL THOMAS C (US)
ROBERTSON DANIEL B (US)
International Classes:
B60G13/00; B60G15/00; B64C27/51; F16F5/00; F16F7/00; F16F9/00; F16F9/10; F16F9/34; F16F11/00; F16F13/08; F16F13/24; F16F13/26; B64C; F16D; (IPC1-7): B60G13/00; B60G15/00; F16F5/00; F16F7/00; F16F9/00; F16F9/10; F16F9/34; F16F11/00
Foreign References:
| US5662046A | 1997-09-02 | |||
| US6644445B2 | 2003-11-11 | |||
| US6668986B2 | 2003-12-30 | |||
| US5775677A | 1998-07-07 |
Other References:
See also references of EP 1658184A4
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