Abstract: An air spring for providing a variable spring rate for a suspension system has an auxiliary fluid reservoir formed within a hollow interior of one of the spaced end members of the air spring. A flexible elastomeric sleeve extends between the end members and forms a main air chamber therebetween which is in communication with the auxiliary fluid reservoir. A fluid supply line communicates with the auxiliary fluid reservoir for changing the volume of fluid within the reservoir. In one embodiment, one end of the flexible sleeve is closed and forms a flexible membrane which extends across an entrance of the auxiliary reservoir and separates the air chamber from the auxiliary reservoir. In another embodiment, a separate inflatable bladder is mounted in the hollow interior of the end member and provides the flexible membrane which separates the air chamber from the auxiliary reservoir.

Abstract: A roofing system and method of securing insulation board to a roof deck free of mechanical fasteners includes the deck, a plurality of the insulation boards, and a flexible waterproof membrane which covers the boards. First and second embodiments of the invention include flexible polyisobutylene pads and strips respectively, which have opposite top and bottom pressure sensitive adhesive surfaces. A plurality of the pads are adhered to the insulation boards by their adhesive top surface at locations where mechanical fasteners otherwise would be necessary to secure the boards to the roof deck. A pair of the strips are adhered to the boards by their adhesive top surface at spaced locations. After removal of a release sheet from the bottom surface of the pads or strips, the boards are placed and pressed on the roof deck, and the exposed adhesive secures the boards to the deck free of mechanical fasteners.