Patent ID: 9327951
Filing Date: 2016-05-03
CPC Classification: A47B,B66F

Claim Text:
1. A drive system for controlling hydraulic cylinders used in a lift system comprising: a housing including a screw jack having an end extending from said housing; a thrust nut coupled to said screw jack, wherein said housing is generally rectangular and said thrust nut is shaped to slide along the inside surface of said housing, and wherein said thrust nut includes a body having a plurality of axially spaced ribs which engage an inner surface of said housing to minimise the frictional engagement of said thrust nut with said housing; at least one hydraulic cylinder including a piston rod coupled to said thrust nut such that rotation of said screw jack provides pressure to said hydraulic cylinder, wherein said thrust nut includes an aperture extending therethrough such that an end of said piston rod can be mounted to said thrust nut and be removed by pushing said rod from a side of said thrust nut opposite the cylinder with which said piston rod is associated; and wherein said end of said screw jack is configured to receive one of a manual crank arm and a drive motor assembly for the rotation of said screw jack.