초록 ▼

A combination comprising a movable floor for arenas or the like adapted to be elevated or lowered by lifting elements above the level of a stationary base floor, a plurality of first box-like framing elements having lifting brackets and beam elements interconnected to form a grid pattern throughout

A combination comprising a movable floor for arenas or the like adapted to be elevated or lowered by lifting elements above the level of a stationary base floor, a plurality of first box-like framing elements having lifting brackets and beam elements interconnected to form a grid pattern throughout the movable floor structure, the lifting elements being supported in a plurality of second box-like framing elements embedded in a base floor beneath the movable floor. Flooring sections made preferably of concrete extend between the beam elements and first box-like framing elements to complete the movable floor structure. The lifting elements each include a vertically extending threaded shaft upon which a horizontally extending lifting plate is removably mounted. The lifting plate extends beneath the lifting brackets attached to the first box-like framing elements. The grid construction of the movable floor permits lifting forces to be carried around a first box-like framing element through adjacent beams to adjacent box-like framing elements and lifting brackets in the happenstance that one lifting element fails.

대표청구항 ▼

A system including the combination of a substantially unitized movable floor and lifting element means adapted to elevate and lower said moveable floor above the level of a stationary base floor wherein: said movable floor includes a plurality of open-ended first box-like connecting elements having

A system including the combination of a substantially unitized movable floor and lifting element means adapted to elevate and lower said moveable floor above the level of a stationary base floor wherein: said movable floor includes a plurality of open-ended first box-like connecting elements having lifting bracket means attached to an inside surface of substantially rigid side walls forming said first box-like elements; beam elements connected between adjacent first box-like elements on an outside surface of said side walls forming said first box-like elements to form a substantially unitized grid pattern of a plurality of similar sections comprising said beam elements on the sides thereof and said first box-like elements at the corners thereof; flooring sections extending between adjacent beam elements and first box-like elements at the corners thereof forming said grid pattern, wherein the top level of said flooring sections, beam elements, and first box-like elements are at substantially the same height to form a substantially smooth movable floor surface; said lifting bracket means attached to said beam elements and said first box-like elements; and lifting elements supported by said base floor, said lifting elements operatively connected to corresponding ones of said lifting bracket means whereby said lifting elements are adapted upon actuation to apply a lifting force to said lifting bracket means and elevate said movable floor to a pre-selected height above said base floor and to support said movable floor at said pre-selected height.