Abstract: A trailer suspension system for controlling the ride characteristics of a trailer. The trailer suspension system includes at least one suspension assembly being designed for being coupled between a frame of the trailer and an axle of the trailer. The suspension assembly is designed for absorbing shock from the axle of the trailer. The suspension assembly comprises a frame mounting assembly being designed for being coupled to the frame of the trailer. An axle mounting assembly is pivotally coupled to the frame mounting assembly. The axle mounting assembly is designed for being coupled to the axle of the trailer. An air spring assembly is coupled between the frame mounting assembly and the axle mounting assembly whereby the air spring assembly is designed for damping movement of the axle mounting assembly when the trailer is traveling over a surface.

Abstract: A suspension system for wheeled vehicles, in particular, trailers and especially semi-trailers. The suspension system includes a platform with a top seat supported above an arcuate bottom saddle. The bottom saddle of the platform is designed for resting on an axle of a vehicle such that the top seat is positioned above the axle. Upper and lower pivot arms are provided each having a pair of opposite ends. A first end of each of the pivot arms is pivotally coupled to the platform. A hanger member has a top plate and a side brace downwardly extending from the top plate of the hanger member. The top plate of the hanger member has a proximal portion and a distal portion. The side brace of the hanger member is coupled to the proximal portion of the top plate. The top plate of the hanger member is positioned above the top seat of the platform. The top plate of the hanger member is designed for attachment to a support frame of a trailer. A second end of each of the pivot arms is pivotally coupled to the side brace.

Abstract: A front axle suspension for a heavy duty vehicle including an elongated leaf spring having its front end affixed to the vehicle frame. The spring has its mid section mounted to the axle beam. An equalizer lever assembly is mounted on the rear end of the leaf spring for pivotal movement about an axis transverse to the frame. The rear end of the lever is affixed a shackle pivotally affixed to the frame. A rubber spring is positioned on the forward end of the lever to bear against the underside of the frame. The leaf spring and the equalizer assembly including the rubber spring combine to provide a smooth ride and improved steering control.