Dual height airspring having adjusted spring rate

Details Dual height airspring having adjusted spring rate Dual height airspring having adjusted spring rate

2005-08-02

2005-08-02

Butler, Douglas C. (Department: 3683)

Spring devices

Vehicle

Comprising compressible fluid

C267S064190, C267S064230

Reexamination Certificate

active

06923434

ABSTRACT:
An air spring having a relatively low and a relatively high spring height includes a retainer, a base housing, an elastomeric sleeve secured to the retainer at a first end and secured to the base housing at a lower end to form a chamber, the elastomeric sleeve expanding from a relatively collapsed configuration at the low air spring height into an expanded configuration at the high air spring height. A confined bladder is disposed within the chamber, the bladder being inflatable to displace a variable portion of an expanded volume within the sleeve chamber at the high air spring height. The spring rate of the air spring is adjusted by an adjustment to the volume of air displaced by the inflated bladder within the sleeve chamber and by overpressurizing the bladder relative to the air spring sleeve, whereby the air spring is adapted to provide a relatively low spring rate at the lower height and a relatively high spring rate at the higher height.

REFERENCES:
patent: 4629170 (1986-12-01), Warmuth, II
patent: 5413316 (1995-05-01), Easter
patent: 5580033 (1996-12-01), Burkley et al.
patent: 6332602 (2001-12-01), Oishi
patent: 6386524 (2002-05-01), Levy et al.
patent: 6511057 (2003-01-01), Berg
patent: 6561500 (2003-05-01), Schisler et al.
patent: 3531542 (1986-04-01), None
patent: 3107630 (1991-05-01), None
patent: 3177633 (1991-08-01), None

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