| 摘要 |
A stabilizing jack for vehicles comprises a pair of jack legs advanceable between retracted and extended positions by a single drive screw having left and right hand threaded sections which is mounted on a slide frame which is slidably mounted to and below a base frame. The base frame is securable to the frame of a vehicle such as a recreational vehicle for use in stabilizing the vehicle when parked. The drive screw has a screw follower or trunnion secured to each threaded section. Each leg is pivotally secured at a first end thereof to one of the screw followers. Struts or leg braces are pivotally connected at one end to each leg, medially thereof, and are pivotally connected at opposite ends to the base frame at the ends closest the respective leg. When the legs are extended or lowered on uneven ground, one leg will engage the ground before the other preventing that leg from further downward advancement but causing the drive assembly to drive the slide frame in an opposite direction while the other leg continues to advance downward until it engages the ground. Once both legs engage the ground, the balanced forces acting through the legs prevents the slide frame from sliding relative to the base frame such that the legs push downward on the ground with equal pressure, pushing upward on the mounting frame and raising the vehicle.
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