Patent ID: 8113314
Filing Date: 2012-02-14
Classification: B60R,E06C

Abstract:
1. A stair system for a mobile oilfield storage tank, the stair system comprising: a platform subsystem attached to a front wall of the mobile oilfield storage tank, the platform subsystem comprising: a staircase subsystem comprising: wherein the second staircase member is pivotally rotatable between a retracted mode and an extended mode, wherein, when the second staircase member is in the retracted mode, at least a portion of the second staircase member is positioned above at least a portion of the first staircase member, and wherein, when the second staircase member is in the extended mode, the staircase subsystem is suitable for use as a stairway to the platform; and a hand rail subsystem comprising: wherein the second hand rail member is pivotally rotatable relative to the first hand rail member, and wherein the moveable support is pivotally rotatable relative to the vertical support.