Storage container for liquids and method of producing the outer container of the storage container

Abstract

A storage container for liquids has a blow-molded plastic inner container, which has four sidewalls, a bottom, and a convex top with various connecting sockets. A blow-molded plastic outer container is formed by four sidewalls, a bottom, and a removable, convex plastic cover with corresponding through-holes for the connections of the inner container and serves to make the inner container leakproof. An outer cage consists of metal grating bars. Finally, a pallet-like support base is made of metal for standing and moving the storage container by forklift or similar handling equipment.

I claim:  
     
         1 . A storage container for liquid, comprising: a plastic inner container which is fillable with the liquid and has four sidewalls, a bottom, and a top that has a filler connection, a drain connection, a vent connection, and a connection for inserting a level indicator; a blow-molded plastic outer container that holds the inner container for leakproofness of the inner container, the outer container having four sidewalls, a bottom and a removable cover, which has corresponding through-holes for the filler connection, the drain connection, the vent connection, and the connection for the level indicator of the inner container; a metal, pallet-like support base, the cover having a cover edge that is drawn down, encloses an upper opening edge of the outer container, and has clamping elements formed on it for fastening the cover on the opening edge of the outer container, the opening edge being provided with corresponding holding devices; and an outer cage that consists of vertical and horizontal grating bars made of metal and is mounted on the metal support base.  
     
     
         2 . The storage container in accordance with  claim 1 , wherein a sidewall of the inner container has a vertical groove that forms a channel between the inner and outer containers for holding one of a leakage probe and a suction hose for leakage liquid.  
     
     
         3 . The storage container in accordance with  claim 1 , wherein the cover of the outer container is upwardly convex and has a peripheral, flat marginal strip, on which a base frame of the support base of a stacked storage container is set.  
     
     
         4 . The storage container in accordance with  claim 3 , wherein the cover has a middle section with a flat collecting depression for leakage liquid dripping from connection screw couplings and fittings.  
     
     
         5 . The storage container in accordance with  claim 4 , and further comprising at least one locking hoop, which consists of a flat bar material, fit on the convex cover of the outer container, and is fastened to two opposite frame parts of an upper frame of the outer cage.  
     
     
         6 . The storage container in accordance with  claim 5 , wherein the locking hoop is fastened by screwing.  
     
     
         7 . The storage container in accordance with  claim 5 , wherein slide edges are formed on the cover of the outer container and run along the locking hoops, gripping arms of a handling device sliding on the slide edges during lifting of a stacked storage container.  
     
     
         8 . The storage container in accordance with  claim 1 , wherein the plastic inner container has one of a cubic shape and a three dimensional rectangular shape.  
     
     
         9 . A method of producing an outer container for a storage container for liquid which has a plastic inner container which is fillable with the liquid and has four sidewalls, a bottom, and a top that has a filler connection, a drain connection, a vent connection, and a connection for inserting a level indicator, the outer container, a metal, pallet-like support base, and an outer cage that consists of vertical and horizontal grating bars made of metal and is mounted on the metal support base, the method comprising the steps of: blow molding of a body of the outer container with four sidewalls, a bottom, and a convex top with a displaced, flat, horizontal, or slightly outwardly sloped marginal strip from an extruded plastic parison, such that the marginal strip turns into four upper, inwardly displaced marginal sections of the four sidewalls of the body of the outer container via a frame-like edge with four marginal sections running parallel to the sidewalls of the body of the outer container and four inwardly curved, narrow connecting sections, such that the frame-like edge of the top projects outwardly a small distance beyond the upper marginal sections of the four sidewalls of the body of the outer container; and, after the blow-molded body of the outer container has cooled, separating the top, which forms the cover of the outer container by cutting out the connecting sections from the closed, blow-molded body of the outer container.