CONTAINER FOR THE TRANSPORTATION AND STORAGE OF LIQUIDS
Description of the Invention The invention relates to containers for the transport and storage of liquids comprising a lower platform-like frame, an interchangeable internal container of synthetic material with four side walls, a lower floor and an upper floor, a top opening of filling to close, and a lower outlet opening with a draining device, as well as an outer jacket constituted by vertical and horizontal metal lattice rods surrounding the outer jacket. During the filling and emptying of the containers for liquids of this type known from the German patent document DE 195 11 723 Cl and, when agitating the liquids in this type of containers, for example for mixing purposes, due to the friction of the liquid, electrical charges may be generated on the surfaces of the container. The main risk of the electrostatic charge lies in the concurrence of sources of ignition with explosive mixtures of gases and vapors. Due to the ability to be charged electrostatically from the inner plastic container, containers for transport and storage of the type under consideration can not be used in enclosures that present an explosion hazard and can not be filled with explosive liquids. Another disadvantage of floor containers of the type under consideration is that they are not sufficiently fire resistant in the event of a fire, a condition that is due to the outer jacket composed of vertical and horizontal trellis rods. The insufficient fire resistance of the known container implies higher storage costs compared to fire-resistant containers, which are due to higher insurance premiums. The object of the invention is the task of improving the construction of the container for the transport and storage of liquids of the type under consideration, in the sense that the inner plastic container is prevented from being charged electrostatically during the filling and emptying of liquids and , that a greater resistance to the fire of the container is achieved. According to the invention, this task is solved by a container for transport and storage having the features of claim 1. The subordinate claims cover advantageous and convenient improvements of the invention. The invention, in the case of a container for the transport and storage of liquids that is provided with an internal container of synthetic material, an outer jacket constituted by horizontal and vertical metal trellis rods as well as with a lower frame in the manner of platform, lies in providing a support piece with four side walls made of a material capable of conducting electricity, preferably metal, sandwiched between the inner container of synthetic material and the outer jacket, so that the electrical charges that are eventually created on the surfaces of the inner container of synthetic material when filling and emptying the container for transport and storage, are derived to earth through the interleaved support piece, the outer jacket and the lower frame as a platform, which is also constituted by an electrically conductive material. The electrical grounding of the plastic inner container allows the container to be used for transport and storage as a container for hazardous materials for flammable liquids such as paints, lacquers or varnishes and solvents with a flash point of < 35 ° C, as well as the use of the container in operating rooms in which an explosive atmosphere can be formed due to gases, vapors or fog. The interspersed support piece helps to increase the physical resistance of the plastic inner container, so that the manufacturing costs of the container for transport can be reduced due to a decrease in the number of lattice rods of the outer jacket and the lower number of crossing points to be welded on the lattice rods. -Measuring the interleaved support piece is additionally achieved an improved fire resistance of the container. Finally, the interleaved support piece provides the inner plastic container with effective protection against external shock and shock as well as protection against the incidence of light, in particular a protection against ultraviolet radiation for light-sensitive liquids. . The invention is explained below based on the figures of the drawing, which represent the following: Figure 1 a perspective representation of a container for transport and storage, Figure 2 an amplified partial section of the bottom region, and 3 shows an enlarged partial section of the region of the lid of the container, and FIG. 4 shows an enlarged section of the emptying fitting of the container protected by a slide. The container 1 for the transport and storage of liquids according to figure lr which can be used as a disposable container and as a returnable container comprises as main parts an internal container 2 of interchangeable polyethylene in the shape of a parallelepiped, with four walls 2a-2d lateral, a lower floor 3 configured as a drainage floor and a top floor 4 with a filler neck 5 for closing with a screw cap 6, as well as with a discharge nozzle 7 with a tap 8 for intake, an outer shirt 8 formed by rods 9, 10 of vertical and horizontal metal lattices intersecting, a lower frame 12 as a platform with a floor tub 13 made of sheet metal to shapely receive the inner container 2 of synthetic material, as well as with a lid 14 of sheet metal to protect the inner container 2. The floor tub 13 is placed at a certain height above the floor on legs 15, 16 of the corners and the center and a frame 17 of legs or runners, so that for the transport of the container 1 for storage and storage the forks of Lifting a transport apparatus, such as a forklift, can be inserted under the floor tub 13 on any of its four sides. The legs 15, 16 and the leg frame 17 or the runners are made of metal or some electrically conductive synthetic material, for example polyethylene with a proportion of conductive carbon. The pallet-like lower frame 12 of the container 1 for transport and storage has measures of length and width that meet European standards. Between the inner container 2 of synthetic material and the outer jacket 9 of the container 1 for transport is arranged a support piece 18 interspersed with four lateral walls 18a-18d. The interposed support piece 18 made in one piece is manufactured by the drawing of a tubular metal element in a straightening press. In the case of a modified embodiment, the interleaved support piece 18 is constituted by two metal elements TJ shaped. There is also the possibility of manufacturing the support piece 18 interleaved plaques made of electrically conductive synthetic material. The side walls 18a-18d of the interleaved support piece 18 are immobilized between the floor tub 13 and the retracted lower ends 10a of the rods 10 vertical lattice of the shirt 9 outside. There is additionally the possibility of screwing the side walls 18a-18d of the support piece 18 interposed to the lower ends 10a of the vertical rods 10 of the lattice and / or to the lower lattice rod 19 of the outer jacket 9. By means of a slightly angled upper edge 20 outside the interleaved support piece 18, insertion of the inner container 2 into the interposed support piece is facilitated., and damage to the inner container is avoided when inserting it. The electric charges that are eventually generated by friction of liquid on the surfaces of the inner plastic container 2 when filling the container 1 for transport and storage with a liquid and when emptying the liquid from the container 1 are earthed through the piece 18 of interleaved support, the outer jacket 9, the floor tub 13, the legs 15, 16 of the corners and the center, and the leg frame 17. The cover 14 of the container 1 for transport and storage has a central opening 21 for access to the filling nozzle 5 of the inner container 2 which is closed with a threaded cover 6, and a peripheral groove 23 with holes 24 for the water to drain which extends along the inner side of the rim 22 of the lid. The cover 14 inset with its edge 22 on the edge
The upper part of the interposed support piece 18 is bolted together with the support piece 18 interposed at the upper ends 10b of the vertical rods 10 of the lattice of the outer jacket 9. The discharge nozzle 7 with the intake tap 8 which is arranged in a depression 25 of the front side 2a of the inner container 2 in the region of the lower floor 3, as well as the region of the outlet below the intake tap 8 formed by the central leg 16 can be covered by a metal slide 26, which is inserted between the front wall 18a trimmed in its lower region of the interposed support piece 18, the lower horizontal rod 19 and the upper horizontal rod 11 of the shirt 9 outside. The slide 26 has a guide surface 27 that slopes slightly outwardly from the region 26a of the bottom edge, which has a slot 28 disposed in the upper region so that the penultimate horizontal lower rod 11 of the lattice of the sleeve 9 engages. outside in the closing position of the slide 26. To be able to empty liquid from the container 1 the slide that has a handle 29 embedded in the upper region 26b of the edge is pulled upwards and is hung by the slot 28 in a horizontal rod 11 of the lattice. In the event of a fire, the inner container 2 of synthetic material is protected against the effects of a fire on the outside by the floor tank 13, the support piece 18 interspersed with the slide 26 and the cover 14, which 13, 18 and 14 are made of metal. The water leaving a fire-fighting installation that falls on the lid 14 of the container 1 and drains through the water drip holes 24 of the peripheral groove 23 of the lid 14 between the side walls 2a-2d of the inner container 2 and the side walls 18a-18d of the support piece 18 interspersed and drained to the ground through holes for draining water in the floor vat 13, exerts a cooling effect on the inside recipe 2 against the effect of heat due to fire. In one embodiment with reduced fire resistance, the container for transport and storage can be equipped with a metal or plastic swiveling protective cover for the discharge connection and the tap which is used as a hinge for the penultimate lower horizontal rod of the lattice of the outer jacket, and the interleaved support piece may have window holes. The interposed support piece 18 and the pallet-like lower frame 12 of the container 1 for transport and storage are preferably made of metal. In the case of a reduced fire resistance of the container 1, the interleaved support part and the lower frame can be made of a synthetic material with electric conduction capacity, for example of polyethylene with a proportion of conductive carbon.