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US 12,644,337 B2Granted
Portable staircase
AssigneeMA Staircase LLC, Paracorp Incorporated
InventorTorsten Leines
Life of this patent
Estimating the term…
Abstract
The disclosure relates to portable staircases having a staircase assembly including an outer staircase and an inner staircase that can move in a telescoping relationship with respect to the outer staircase. Portable staircases of the disclosure are particularly useful for accessing an oil drilling rig as they are independently supported with respect to the drilling rig, thus providing numerous safety improvements and advantages. Methods of using the portable staircases of the disclosure are also disclosed.
Claims7
A portable staircase comprising:
- a trailer having a frame, a plurality of wheels, and a wheel frame;
- a staircase assembly secured to the frame, the staircase assembly including an outer staircase connected to the frame and an inner staircase mounted in a telescoping fashion with respect to the outer staircase;
- wherein the outer staircase includes a railing and the inner staircase includes a railing;
- a first hydraulic lift assembly arranged and configured to vary an angle of the staircase assembly with respect to a surface on which the trailer is positioned;
- and
- a second hydraulic lift assembly arranged and configured to vary a position of the inner staircase with respect to the outer staircase;
- wherein the first hydraulic lift assembly is interconnected with the frame and wherein the frame includes a first portion pivotally connected to the wheel frame and also pivotally connected to a first set of brackets that connect the first portion to opposing sides of the outer staircase, wherein the frame further includes a second portion pivotally connected to the first hydraulic lift assembly and also pivotally connected to a third portion that is pivotally connected to a second set of brackets that connect the third portion to opposing sides of the outer staircase;
- and
- the portable staircase further comprises a first support post provided on the second portion to extend perpendicularly away from the second portion so that the third portion can engage and disengage the first support post.
6 more elements
Dependencies are inferred from the claim text.