Vertically movable stage assembly

A mobile self-standing stage unit comprising:

• a) a main ground-engaging casing, defining a flooring member, freely engageable over ground, an integral peripheral upstanding wall having a top edge, and a access opening circumscribed by an upright wall top edge;
• b) a ram member, defining a cylinder section, fixedly mounted in upright position to said casing flooring member, and a piston section defining an inner section, slidingly engaged into said cylinder section, and an outer end;
• c) a platform, having an underface with a central area transversely anchored to said piston outer end of said ram member, and an opposite top face adapted to stably support at least one performer spacedly over ground, said platform template being diametrally smaller than said casing access opening;
• d) hydraulic power means, carried within said casing and operatively connected to said ram member for continuous, long-lasting, up and down reciprocating motion of said platform over said main casing;
• e) a number of upright post members defining top and bottom ends, said post members fixedly mounted at their bottom ends to said main casing upright wall top edge and fixedly connected at their top ends to a transverse top panel, wherein an open upright see-through cage is formed over said casing, said platform freely reciprocatable under power from said hydraulic power means through a lower section of said cage between a first downward limit position, approximately within said casing access opening, and a second upward limit position, intermediate said casing accessing opening and said top panel, so that a performer supported by the platform may move up and down therewith without contacting said top panel;
• wherein said mobile stage unit is destined to be freely mounted in upright condition over ground spacedly under the room ceiling and to be completely portable and freely movable as a single unit from one location to another, without special tools nor skilled labour and without modification to the ground surface.