Patent Publication Number: US-5293761-A

Title: Boiling-water clothes washing machine

Description:
BACKGROUND OF THE INVENTION 
     The present invention is related to a boiler-water clothes washing machine including a heater mounted in a tub to boil washing water at a predetermined temperature. 
     PRIOR ART 
     A conventional warm water clothes washing machine operates a heater in a water container corresponding to the washing procedures to warm washing water, but it generates much steam vapor which rises to the upper portion of the tub while heating washing water at a high temperature. Therefore, during the operation of the heater the steam vapor requires perfect sealing with respect to the upper opening that there be achieve portion of the tub for safety, i.e., protecting the electrical components of the washing machine as well as reducing the thermal losses. 
     A tub cover of the washing machine is usually fitted into the upper inner diameter portion of the tub with its outer periphery edge being projected downward, and the outer periphery edge is then coupled by means of a number of bolts to the upper portion of the tub. The tub cover also includes a center opening covered an inner cover positioned to enable a user to insert/remove washing clothes therefrom, a hole formed at a predetermined size to supply washing water therethrough and a water feeder communicating with an outside water tap. 
     However, this clothes washing machine is available for washing clothes with warm water, not boiled water. That is to say, the tub cover as well as the inner cover would be deformed at a high temperature to create wide clearances relative to the wall portion of the tub and against each other, thereby causing great leakage of steam vapors thermal losses. Even though the water feeder is very simple in configuration, it has the critical problem that under the assumption that the pressure of washing water from the water tap is uneven, the strong pressure of washing water causes difficulties in achieving a smooth water supply and furthermore flow across the tub cover, thereby producing damage to electrical parts of the washing machine. 
     Such a configuration is typically disclosed in U.S. application Ser. Nos. 07/885,885 and 07/884,196, each of which shows a water container structure and a tub cover structure for laundering clothes at a very high temperature, for example 95° C. 
     In order to resolve these problems, a main object of the present invention is to provide a boiling-water clothes washing machine which is capable of processing wash water of a very high temperature in addition to hot water washing. 
     Another object of the present invention is to provide a boiling-water clothes washing machine including an inner cover having the effective sealing with the upper portion wall of a tube without deforming at a high temperature. 
     Another object of the present invention is to provide a boiling-water clothes washing machine including a water supply apparatus for providing smooth water supply of wash water communicating with an outside tap without disturbing the opening/closing of a tub cover. 
     SUMMARY OF THE INVENTION 
     The present invention comprises a boiling clothes washing machine, in which a tub has a cover made of materials withstanding a high temperature and including inner and outer projecting portions projected downward at a predetermined spacing to form a coupling groove. The groove tightly receives an upper rim of the tub to prevent distortion of the cover. A water supply apparatus includes a water feeding fitting connected to a water tap, an intermediate connector for adjusting the supplied washing water pressure and a water feeder which is a corrugated pipe made of flexible materials. 
     Thus, the present invention provides a prominent washing effect with the high temperature process of cleaning, reduces loss due to the tight seal of the inner cover on the tube during the hot or boiling water wash cycle, and protects the electrical components of a heater by preventing the leakage of the steam vapor. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will be now explained in detail with reference to the attached drawings, in which: 
     FIG. 1 is a vertical cross-sectional view illustrating a boiling-water clothes washing machine according to the present invention; 
     FIG. 2 is an enlarged fragmentary view of FIG. 1; and 
     FIG. 3 is a plan view of the upper surface of a tub cover according to the present invention. 
    
    
     DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 
     FIG. 1 shows the configuration of a boiling-water clothes washing machine. A body 1 forms an internal space and includes a cover 7. That internal space contains a tub 2 which retains washing-water therein. Disposed within an internal space formed by the tub is a wash tank 3 which receives clothing. The tub includes the wash tank 3 and a heater 6 mounted between the outer bottom of the wash tank 3 and its inner bottom. The wash tank 3 has an agitator 4 positioned therein which is connected to a driving portion 5 constituted as a conventional gear box and motor. 
     The tube has a tub cover 10 and is provided with a water supply apparatus. The tub 2 includes a washing water guide conduit 12 slightly projected outward from its upper wall to receive the supplied wash water. The tub cover 10 is made of materials capable of withstanding a high temperature and mounted on the upper wall of the tub in a manner that two inner and outer projecting flanges 15 and 16 of the cover are extended continuously around its periphery edge to form a coupling groove, with the rim of the tub upper wall being tightly fitted in the groove. The tub cover 10 also includes an inner door or cover 14 pivoted to a hinge 13 for covering an access opening which enables clothes to be loaded into/removed from the wash tank 3. Therefore, the seal of the tub 10 blocks the leakage of the steam vapor. 
     The water supply apparatus includes an intermediate connector 8 having a predetermined volume to adjust the pressure of the inflow wash water, a water feeding fitting 9 directed to a water tap and a water feeder 11 coupled to the intermediate connector 8 for feeding wash water into the tub. The feeder 11 communicates with a hole formed on the tub cover 10. The intermediate connector 8 comprises an empty box forming an enlarged chamber which relieves the pressure of washing water from the water received feeding fitting 9. The water feeder 11 is made of flexible material in the form of a corrugated hose. Therefore, the pressure-adjusted wash water is smoothly supplied to the tub without flowing across the tub cover 10. 
     Accordingly, the present invention protects electrical equipment from damage caused by steam vapors and reduces the thermal loss, thereby promoting the associated optimal performance of the washing machine. Furthermore, it is noted that the installation of a tub cover allows clothes to be washed at temperatures higher than a conventional washing machine which uses hot water, thereby increasing the washing efficiency of the washing machine.