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 Household-type refrigerators are largely known to require defrosting periodically, or cyclically, so as to allow for an efficient operation of the refrigerating circuit, while the frost that so melts into water must of course be appropriately removed from the appliance.
 Compressors are since a long time now used, which are to such a purpose provided with a proper evaporation pan which is mounted on top of the shell of the compressor, and in which the defrost water is discharged from the interior of the refrigerator via an appropriate flexible tube. The heat that is generated by the compressor and transferred to the pan thereupon causes the so collected defrost water to evaporate in an automatic and effective manner.
 Assembling the pan upon the compressor constitutes a technical problem that has up to now been solved with various means and methods.
 The Italian utility model application no PN2000U 000023, at this same Applicant describes a refrigeration compressor provided with a moulded plastic pan that is mounted upon the shell of the compressor by means of a profile section adapted to slide in a vertical direction into a through-aperture provided in the body of the pan This profile section terminates at its lower end portion with a hook-like portion engaging the border that joins the lower body of the compressor casing with the upper shell thereof. The profile section is kept in position owing to a serrated surface thereof engaging an elastic tongue protruding from the though-aperture in the body of the pan.
 The solution disclosed in the above cited utility model is certainly a convenient and effective one. However, it can be further improved In fact, the border of the compressor to which said profile section is due to hook on may be rounded off or bevelled, so that such a hook-on coupling may become unstable owing to the vibrations which it is exposed to when the compressor is operating. Furthermore, the use of a tool, albeit a simple screwdriver, is always required in order to remove the pan from the compressor.
 The technical solution according to the present invention enables such drawbacks to be done away with by having the pan for the evaporation of the defrost water of the refrigerator hooked on to one of the tubes that connect the compressor to the refrigerating circuit, as well as by providing the lower end portion of the related hook-on coupling profile section with a retention tab, as recited in the appended claims.
 Features and advantages of the present invention will anyway be more clearly and readily understood from the description that is given below by way of non-limiting example with reference to the accompanying drawings, in which:
 With reference to
 Such a compressor
 Upon the shell
 According to the present invention, the pan
 Said profile section
 In order to enable the profile section
 According to the present invention, the profile section
 By hooking the profile section
 The solution according to the present invention therefore improves the solution described and claimed in the former utility model application no. PN2000U 000023 filed by this same Applicant, while adding the advantages of a particular effectiveness and convenience to the inherent advantages of that solution.