Abstract: A pivot assembly particularly adapted for pivotally interconnecting a pair of relatively thin parallel walls spaced an appreciable distance from one another. A stud with a pivot joint on one end is interposed between the walls.

Abstract: A mobile human life unit includes an elevatable platform supported by a ladder mounted on a wheeled vehicle. A first embodiment of the mobile human lift unit utilizes a winch with a winch cable reeved over a pulley carried by a support having at least three legs which are held in fixed positions on the platform. A second embodiment of the mobile human lift unit has an overhead crane with a track which swings about a vertical pivot axis and carries a trolley with a winch.

Abstract: A modular platform system comprising at least one platform unit of a predetermined length, the platform unit having predrilled holes at predetermined intervals; at least one stair unit of a predetermined length connectable with at least one platform unit, the stair unit further comprising a number of steps connectable by a pair of side rails, the side rails causing the steps to slant in a downward direction at a predetermined angle; at least one end unit of a predetermined height connectable with at least one platform unit; at least one stair railing unit of a predetermined length connectable to at least one platform unit and to at least one stair unit; and, at least one platform railing unit of a predetermined length connectable to at least one platform unit, wherein a platform system of varying dimensions can be customized by a user.