Patent ID: 8006628
Filing Date: 2011-08-30
Classification: B61D

Abstract:
1. An extendable staircase installed to a vehicle proximate an opening of the vehicle, comprising: a plurality of staircase step forming members, each of the staircase step forming members comprising: a pair of guide parts arranged at a distance and in parallel with each other, a step plate interposed between the pair of guide parts, and a protrusion provided in at least one of the guide parts adjacent two of the step forming members at a contacting portion between the guide parts adjacent two of the step forming members, the pair of guide parts each having a squarish U-shape cross-section, and arranged such that recesses of the squarish U-shapes of the pair of guide parts face each other, the step plate connecting the pair of guide parts so as to transverse the pair of guide parts diagonally and have each end of the step plate extend to a recess of the squarish U-shape of each of the pair of guide parts; wherein the guide parts of adjacent two of the step forming members have sizes that are different by thicknesses of one of the guide parts, and wherein the staircase step forming members form stairs extending toward a guideway surface by sliding the step forming members with respect to each other.