Patent ID: 7758103
Filing Date: 2010-07-20
Classification: B60P

Abstract:
1. Mobile living quarters having a liftable top comprising a pump for communicating fluid through fluid lines, said pump including a plurality of pistons, each said piston slidably retained in a cylinder, each piston and cylinder forming a chamber for pumping fluid into said lines, each of said chambers connected to a single fluid line, said liftable top being supported by a plurality of lifting members including a piston slidably retained in a cylinder, said piston and cylinder forming a chamber for receiving or discharging fluid, said piston containing a bore along its entire axis, said bore receiving a plug, said plug located at the uppermost end of said piston external to said chamber, said plug releasably retained to permit bleeding of fluid from said chamber of said lifting member, said lifting members extending upon receipt of fluid and retracting upon discharging fluid, said fluid discharged at a rate which is a function of the weight borne by each said lifting member, each said lifting member connected to said pump through a fluid line in communication with said pump and terminating at said lifting member, each said fluid line including a flow control valve between said pump and said lifting member, said fluid communicated through said flow control valve to said lifting member connected to said pump, said fluid also communicated through said flow control valve when fluid is discharged from said lifting member, said flow control valve limiting the flow rate of said fluid to a constant predetermined rate when said fluid is discharged from said lifting member.