Importance

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Abstract

A pneumatic seat suspension assembly including upper and lower support members with scissors linkages extending therebetween, a pneumatic spring operatively attached between one set of opposing parallel scissors arms, a height adjuster in communication with the pneumatic spring, a dump valve in communication with the pneumatic spring and a safety rollover valve in communication with the pneumatic spring. The scissors linkage provides the mechanical connection between the seat bottom and the seat support while the pneumatic spring provides the structure to raise and lower the seat bottom by use of compressed air which causes the parallel scissors linkages to be pushed upward causing the seat to rise. The height adjuster consists of an air valve connected via air lines to the pneumatic spring and to a valve to transmit or vent pressurized air to or from the spring to allow the seat to be biased vertically within a range while the pressurized air within the air spring compensates for the weight of the seat occupant. The dump valve provides a trigger which, when actuated, releases the air from the pneumatic suspension assembly to lower the seat to its lowest point to allow easy access to the seat such that when re-activated allows for the seat to regain its pre-dump position. The rollover valve is connected along the main air line to the pneumatic spring such that, when the plane of the seat bottom reaches approximately 80.degree. from the horizontal, the air in the pneumatic spring is released allowing for the seat bottom to descend to its lowest position.

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First Claim