Lifting jack arrangement for lifting platforms
AssigneeMaha Maschinenbau Haldenwang GmbH & Co. KG
InventorHubert Wanner
Life of this patent
Estimating the term…
Abstract
A lifting jack arrangement for lifting platforms. The lifting jack has a liftable and lowerable, dimensionally stable guide tube on the upper end of which support elements, for example for a motor vehicle, can be mounted. A driving unit would typically be coupled with the guide tube for lifting and lowering it. A stationary guiding sleeve has sliding elements which are in contact with the guide tube. The guide tube is coated with a reduced-friction, abrasion resistant sliding layer consisting of a permanently adhering synthetic material containing PTFE.
Claims20
A lifting jack arrangement for lifting platforms comprising:
- a liftable and lowerable, dimensionally stable guide tube having an upper end configured to include support elements for supporting a motor vehicle, wherein the guide tube is coated with a reduced-friction, abrasion resistant sliding layer;
- and
- a stationary guiding sleeve comprising sliding elements that are in contact with the guide tube.
A lifting jack arrangement for lifting platforms comprising:
- a liftable and lowerable, dimensionally stable guide tube having an upper end configured to include support elements for supporting a motor vehicle, wherein the guide tube is coated with a reduced-friction, abrasion resistant sliding layer;
- a stationary guiding sleeve comprising sliding elements that are in contact with the guide tube;
- and
- a driving unit comprising at least one hydraulic piston/cylinder unit disposed inside or outside of the guide tube, said hydraulic piston/cylinder unit further comprising a stationary piston rod and a liftable and lowerable cylinder housing, said stationary rod being supported by a lower base and the liftable and lowerable cylinder housing of said piston/cylinder unit being fixedly connected to the upper end of the guide tube via a massive plate element.
A method of providing a lifting jack arrangement for lifting platforms with longer wearing paired sliding surfaces, the lifting jack arrangement comprising:
- a liftable and lowerable, dimensionally stable guide tube having an upper end configured to include support elements for supporting a motor vehicle;
- and
- a stationary guiding sleeve comprising sliding elements that are in contact with the guide tube, the method comprising the steps of:
- cleaning the surface of the guide tube;
- roughening the surface of the guide tube;
- applying a reduced-friction layer to the guide tube;
- and
- heating the guide tube to about 200° C. to about 250° C.,
- wherein reduced-friction layer provides longer wear to the paired sliding surfaces.
Dependencies are inferred from the claim text.