Tank apparatus for holding a reserve supply of coolant for a radiator on a vehicle
BACKGROUND OF THE INVENTION 
     This invention relates to a tank apparatus for holding a reserve supply of coolant for a radiator on large size vehicles such as construction and industrial vehicles. 
     Large size vehicles are usually equipped with a reserve coolant tank, in addition to a coolant tank or tanks on and/or below the radiator, for holding an additional supply of coolant to be dispensed as required. The reserve coolant tank may be either installed away from the radiator assembly, comprising the radiator itself and the radiator guard, or built into the radiator assembly. The installation of the reserve coolant tank away from the radiator assembly is objectionable because of the additional installation space required. This objection can of course be overcome by building the tank into the radiator assembly. However, this alternative has heretofore had its own weakness. Since the reserve coolant tank has so far been fabricated from either metal or plastic, the deformation of the radiator guard has been easy to lead to the cracking of the tank, resulting in the leakage of the coolant therefrom. Further, having been permanently or semipermanently secured to the radiator assembly, as by welding, the tank when cracked has not been readily removable from the radiator assembly for replacement with a new one. 
     SUMMARY OF THE INVENTION 
     The present invention overcomes the noted problems of the prior art by providing an improved reserve coolant tank apparatus including a tank proper which is compactly built into the tank assembly but which is not to be cracked in the face of the deformation of the other parts of the tank assembly. The tankapparatus is also well calculated to allow easy replacement of the tank. 
     Stated briefly, the improved reserve coolant tank apparatus in accordance with our invention comprises rigid enclosure means disposed internally of a radiator guard and secured thereto to define a tank receiving space of prescribed shape open to an aperture in the radiator guard. Relatively closely received in the tank receiving space is a tank of elastic material having an approximate shape of the tank receiving space and supported by the enclosure means. The tank has a mouth disposed in register with the aperture in the radiator guard. A rigid closure member closes the mouth in the elastic tank by being bonded or otherwise firmly attached thereto. The closure member is further detachably secured to the enclosure means so as to be exposed through the aperture in the radiator guard. 
     Preferably the tank is an integral molding of sheet rubber. The sheet rubber tank, together with the rigid closure member closing its mouth, can be readily pushed into the tank receiving space within the enclosure means through the aperture in the radiator guard. The installation of the tank can be completed simply as the closure member is subsequently screwed or otherwise removably fastened to the enclosure means. When thus received in the tank receiving space, the tank is held at nearly all parts against the enclosure means for firmly holding coolant that is to be charged into the tank through filler means formed on the rigid closure member. 
     Of course, the sheet rubber tank is absolutely free from the possibility of cracking despite the possible deformation of the radiator guard during vehicle operation. Further, when the need arises for tank replacement, the rigid closure member may first be detached from the enclosure means, and then the tank with the closure member thereon may be withdrawn from the tank receiving space through the aperture in the radiator guard by taking advantage of the elasticity of the tank. 
     The above and other features and advantages of this invention and the manner of realizing them will become more apparent, and the invention itself will best be understood, from a study of the following description and appended claims, with reference had to the attached drawings showing a preferred embodiment of the invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a partial, diagrammatic side elevation of the vehicle incorporating the improved reserve coolant tank apparatus of this invention, showing in particular the radiator and the radiator guard on the vehicle; 
     FIG. 2 is a rear elevation of the arrangement of FIG. 1, as seen from the right hand side of FIG. 1; 
     FIG. 3 is a section through the arrangement of FIGS. 1 and 2, taken along the line III--III of FIG. 2; 
     FIG. 4 is an enlarged, fragmentary, vertical sectional view showing in detail the reserve coolant tank apparatus constructed in accordance with the invention and as adapted for use with the vehicle of FIGS. 1 through 3; 
     FIG. 5 is a plan view of the reserve coolant tank apparatus of FIG. 4; 
     FIG. 6 is a vertical section through the reserve coolant tank apparatus, taken along the line VI--VI in FIG. 4; and 
     FIG. 7 is an exploded perspective view of the tank proper and rigid closure member of the tank apparatus of FIGS. 4 through 6. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIGS. 1 through 3 of the above drawings diagrmmatically illustrate, to an extent necessary for a full understanding of the present invention, the organization of a vehicle to which the invention finds application. At 10 in FIG. 1 there is shown the main frame of the vehicle which as a radiator 12 and radiator guard 14 fixedly mounted at or adjacent its front end. The radiator guard 14 has a conventional pair of hydraulic implement actuator cylinders 16 operatively mounted externally on its opposite sides. 
     As will be seen from FIG. 2, the interior of the radiator guard 14 has a pair of mounting means 18 on its opposite sides reserved for the mounting and operation of the implement actuator cylinders 16. A space 20 intervening the spaces 18 is intended for the installation of the reserve coolant tank, not shown in FIGS. 1 through 3, in accordance with the invention. The reserve coolant tank is to be communicated with the radiator 12 by way of conduit seen at 22 in FIG. 3. 
     Reference is now directed to FIGS. 4 through 7 for a more detailed description of the reserve coolant tank apparatus in accordance with the invention. It will be observed from FIGS. 4 through 6 that a rigid, dual enclosure 24 is disposed internally of the radiator guard 14 and is welded or otherwise firmly attached thereto to define a tank receiving space 26 of prescribed shape which is open to an aperture 28 defined in the top of the radiator guard. The dual enclosure 24 comprises a relatively thin inner enclosure 30 and a thicker outer enclosure 32, both made of metal. Preferably, and as shown in FIG. 4, a pair of flat reinforcement members 34 are secured directly to the inside surface of the radiator guard 14 and coact with the dual enclosure 24 to define the tank receiving space 26. These reinforcement members may be considered parts of the enclosure 24. 
     Received in the tank receiving space 26 is a reserve coolant tank 36 best illustrated in FIG. 7. The tank 36 is shown as an integral molding of sheet rubber, either natural or synthetic, having approximately the same shape and size as the tank receiving space 26. The tank 36 has a mouth 38 formed in its top so as to be in register with the aperture 28 in the radiator guard 14 when the tank is received in the tank receiving space 26, as best shown in FIG. 4. The mouth 38 is permanently or semipermanently closed by a rectangular closure member 40 of metal, complete with a pair of mounting flanges 42 at its opposite ends, which may be bonded to the rubber tank by the vulcanization of the latter. The tank 36 has a comparatively small outlet opening 44 formed in one side thereof which also is semipermanently closed by a closure member 46 of metal. This second closure member may also be bonded to the rubber tank 36 by vulcanization. An outlet pipe 48 extends through the second closure member 46 for the dispensation of the coolant contained in the tank. 
     The tank 36 of the above construction is so pliant that it can be readily pushed into the tank receiving space 26 through the radiator guard aperture 28. The mounting of the tank 36 can be completed simply by subsequently fastening the pair of mounting flanges 42 of the first closure member 40, closing the tank mouth 38, to the pair of reinforcement members 34 as by screws 50. When thus mounted in position, the tank 36 has nearly all its parts held against the enclosure 24 to be supported thereby, as will be seen from FIGS. 4 and 6. 
     Exposed through the radiator guard aperture 28, the first closure member 40 has mounted thereon a filler neck 52, complete with a filler cap 54, and a level sensor 56. As clearly seen in FIG. 6, the second closure member 46 is partly received in, and exposed through, an opening 58 in the enclosure 24, so that the outlet pipe 48 extends outwardly of the enclosure for communication with the radiator 12 through the conduit 22 shown in FIG. 3. 
     Such being the construction of the reserve coolant tank apparatus in accordance with the invention, it will be seen that coolant can be charged into the tank 36 through the filler neck 52 and dispensed from the tank through the outlet pipe 48 in the usual manner. The tank 36 can be firmly maintained in shape in the tank receiving space 26 despite such coolant introduction and withdrawal since it is nearly wholly held against the rigid enclosure 24 and since the rigid first closure member 40 integral with the tank is screwed to the reinforcement members 34. 
     Being molded of rubber, the tank 36 is of course not to crack in spite of the possible deformation of the radiator guard 14 or of the enclosure 24 during the operation of the vehicle. Further, as required, the tank 36 can be readily withdrawn from the tank receiving space 26 through the radiator guard aperture 28 by loosening the screws 50. 
     It will of course be understood that the details in the construction of the reserve coolant tank apparatus are subject to change depending upon each particular vehicle to which the invention is applied. Various changes may therefore be made in the form, details, arrangements, and proportions of the parts without departing from the scope of the invention as set forth in the appended claims.