Patent ID: 9073516
Filing Date: 2015-07-07
Classification: B60S,B66C,B66F

Abstract:
1. A leveling jack for establishing clearance between a first surface and a second surface, said leveling jack comprising a piston, a fluid pump and a fluid reservoir within a sealed housing mountable on one of said surfaces, said piston being slidable in said sealed housing and including a piston rod extending from said housing to engage the other of said surfaces to control the clearance between said first surface and second surface in response to sliding of the piston, said sealed housing comprising internal fluid passages in fluid communication with said pump, said piston and said reservoir without fluid communication into said sealed housing from a source exterior of said sealed housing, and a motor connected to and configured to drive said fluid pump; wherein said sealed housing includes a leveling cylinder defining a bore slidably receiving said piston, said piston rod extending from one end of said bore, said piston cooperating with another end of said bore to define an extension chamber; wherein said pump is mounted in a pump unit defined within said sealed housing, said reservoir being defined within said pump unit; and wherein said pump unit is defined within a housing having an end closed by a cap also closing said another end of said bore, one of said passages being defined in said cap, a check valve mounted within said cap.