公开(公告)号：US5100105A

公开(公告)日：1992-03-31

申请号：US758278

申请日：1991-08-27

申请人： Robert H. Schneider ,  John W. Raffensperger, Jr.

发明人： Robert H. Schneider ,  John W. Raffensperger, Jr.

IPC分类号： B60S9/12

CPC分类号： B60S9/12

摘要： A lifting and lowering system for a trailer includes one or more extendible and retractable legs, with the legs being provided with springs or the like urging the legs toward their retracted position. The system is a pressurized air/hydraulic system, and includes an air-operated booster valve for extending the legs when loaded. A master valve assembly is provided for controlling supply of air to the system and for allowing retraction of the legs. The master valve and air valve include a common actuator shaft so that the system is selectively connected to pressurized air or vented, as appropriate, when leg extension or retraction occurs. The master valve includes a cam actuator/cam follower piston operated system for selectively providing fluid pressure to a lock valve associated with each leg. The lock valve is biased toward a normally closed position, and is selectively movable to an open position for allowing extension or retraction of the legs.

摘要翻译： 用于拖车的提升和降低系统包括一个或多个可伸缩和伸缩的腿，腿部设置有弹簧或类似物，以将腿朝向其缩回位置推动。 该系统是加压空气/液压系统，并且包括用于在加载时延伸腿的气动增压阀。 提供主阀组件用于控制向系统供应空气并允许腿部缩回。 主阀和空气阀包括公共致动器轴，使得系统选择性地连接到加压空气，或者当腿部延伸或缩回发生时适当地排气。 主阀包括用于选择性地向与每个支腿相关联的锁定阀提供流体压力的凸轮致动器/凸轮从动件活塞操作系统。 锁定阀被朝向常闭位置偏置，并且可选择性地移动到打开位置以允许腿的伸展或缩回。