Abstract:
A pallet for the cold storage or transportation of goods consists virtually of a single framework molded from a plastics material, and having a hollow interior filled with a refrigerant without the aid of any bag.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a pallet on which goods are placed for cold storage or transportation. 
     2. Description of the Prior Art 
     There has long been known a pallet which is usually made of wood or metal, and on which goods are placed for cold storage or transportation in, for example, a refrigerator container which is loaded or unloaded by a forklift. The use of the known pallet has, however, given rise to a serious problem, i.e., during the handling or transportation of cold or frozen goods, they obtain a higher temperature by absorbing heat from the pallet and thereby become lower in quality. 
     In view of the above problem, Japanese Utility Model Publication No. Sho 61-37622 has proposed a pallet having a refrigerating power. It comprises a plurality of hollow deck boards made of aluminum, and held together at both ends by beams, and each containing a polyethylene bag which holds a refrigerant for keeping goods cold. The proposed pallet has, however, a number of drawbacks. As it is composed of a large number of parts, its fabrication calls for a great deal of time and labor and the pallet is, therefore, expensive. Moreover, it is not easy to fit the bag in intimate contact with the inner surface of the deck board, but a layer of air is very likely to form between the deck board and the bag and have an adverse effect on the conduction of heat therebetween and thereby the effective cooling of the goods by the refrigerant. 
     SUMMARY OF THE INVENTION 
     Under these circumstances, it is an object of this invention to provide a pallet for the storage or transportation of goods which can effectively keep the goods cold by employing a refrigerant, and yet which is free from any possibility of being corroded by the refrigerant. 
     It is another object of this invention to provide a pallet which has only a small number of parts and can be fabricated easily and at a low cost. 
     It is still another object of this invention to provide a pallet which is suitable for transportation by a forklift. 
     These objects are essentially attained by a pallet which comprises a single framework formed from a plastics material, and having a hollow interior filled directly with a refrigerant. 
     The refrigerant fills the hollow interior of the framework directly, i.e. without the aid of any bag, and therefore, can effectively keep cold the goods carried on the pallet. The framework is not corroded by the refrigerant contacting it directly, since it is formed from a plastics material. As the framework can be molded as a single body, the pallet of this invention consists virtually solely of the framework and can, therefore, be constructed easily and at a low cost, as compared with the known pallet of the type containing a refrigerant. 
     The pallet preferably has two sets of holes each adapted for receiving a prong of a forklift therein. 
     Other features and advantages of this invention will become apparent from the following description and the accompanying drawing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a pallet embodying this invention; and 
     FIG. 2 is a sectional view taken along the line II--II of FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A pallet embodying this invention is shown in the drawing, and comprises a rectangular framework 1 molded from a plastics material, such as polyethylene, polyvinyl chloride, or glass fiber-reinforced plastics, and having a hollow interior. The framework 1 has a top face 1a, a bottom face 1b, a first pair of opposite side faces 1c and 1d, and a second pair of opposite side faces 1e and 1f. The framework 1 has a plurality of slots 6 extending in parallel to the side faces 1c and 1d and terminating somewhat inwardly of the side faces 1e and 1f, respectively. The slots 6 are open at the top and bottom faces 1a and 1b of the framework 1 to allow the passage of cold air therethrough when the pallet stays in a refrigerator. 
     The slots 6 divide the framework 1 into a plurality of elongate compartments 2 extending parallel to the side faces 1c and 1d of the framework 1 and connected with one another along the side faces 1e and 1f, respectively. The compartments 2 are filled with a refrigerant 3. The refrigerant 3 may, for example, be composed of water, and an organic compound such as alcohol or glycol, or an inorganic salt such as sodium or calcium chloride. It performs a cooling action by absorbing sensible or latent heat. 
     The framework 1 has a port 4 formed in one of its side faces 1f for admitting the refrigerant 3. After the compartments 2 have been filled with the refrigerant 3, the port 4 is closed by an adhesively bonded cover 5, or a plug (not shown). 
     The framework 1 has two parallel sets of holes 7 aligned with one another and formed through the framework portions defining the compartments 2 at right angles thereto. The two sets of holes 7 are appropriately spaced apart from each other for receiving two prongs, respectively, of a forklift which will be employed for lifting and carrying the pallet. 
     If the pallet carrying goods thereon is placed in a refrigerator container, the refrigerant can keep the goods cold, even when the refrigerator is out of order. If the pallet is pre-cooled, it is possible to keep the goods cold and avoid any undesirable change in quality thereof for a certain length of time before the pallet is placed in a refrigerator container, or after its removal therefrom. 
     As the pallet is a product molded from a plastics material which is resistant to corrosion by the refrigerant, the refrigerant can be employed to fill its hollow interior without the aid of any bag. Therefore, the pallet of this invention is simpler in construction, and easier to fabricate than the known pallet containing a refrigerant, and yet can keep the goods cold effectively.