Laundry washing machine

• US 4,580,421 A
• Filed: 12/03/1984
• Issued: 04/08/1986
• Est. Priority Date: 12/06/1983
• Status: Expired due to Term

• Current Assignee: Industrie Zanussi S.P.A. (AB Electrolux)
• Original Assignee: Industrie Zanussi S.P.A. (AB Electrolux)
• Inventors: Durazzani, Piero, Frucco, Giuseppe, Babuin, Piero
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US06/677,302
• Time in Patent Office: 491 Days
• Field of Search: 68/12 R, 68/207, 68/16, 68/58, 68/18 F
• US Class Current: 68/12.13
• CPC Class Codes: D06F 23/02 and rotating or oscillating about a horizontal axis
• CPC Class Codes: D06F 39/04 Heating arrangements
• CPC Class Codes: D06F 39/083 Liquid discharge or recirculation arrangements

Abstract

A laundry washing machine includes a washing tub, a washing drum for containing laundry to be washed, a collector for collecting washing liquid, and a recirculation pump connected to the collector and to the tub for recirculating the washing liquid from the collector to the tub and to spray it onto the laundry. The collector has therein at least one heating element and a thermostatic sensor for heating the washing liquid and for thermostatically controlling the temperature thereof, respectively. Level sensors and controls are provided for carrying out "intense" and "gentle" laundering programs for washing the laundry in a conventional manner, and with further sensors and controls for carrying out "intense" laundering programs at reduced filling levels of the washing liquid within the tub by repeatedly recirculating the liquid to the tub.

Claims

1. A laundry washing machine comprising:

a washing tub;

a drum rotatably mounted in said tub;

a washing liquid collector disposed at a position below said tub and communicating with an outlet thereof;

electric circulation pump means having an inlet and an outlet connected respectively to said collector and to said tub for repeatedly recirculating washing liquid from said collector to said tub;

said electric pump being connected in an electrical circuit including means for heating the washing liquid, means for controlling the filling level of washing liquid into said tub, and means for controlling the temperature to which the washing liquid is heated by said heating means;

said filling level control means comprising a first group and a second group of level control elements calibrated in such a manner that said elements of said first group are effective to establish filling levels that are lower than those established by said elements of said second group; and

actuating means for connecting said heating means and said temperature control means in series selectively with said elements of said first group in parallel with said electric recirculation pump means or with said elements of said second group.

2. A laundry washing machine as claimed in claim 1, wherein said actuating means comprise first and second switch means connected respectively with said elements of said first group and said second group, said first switch means are connected with said electric recirculation pump means by respective electric contact means and are movable from a first operative position, in which said first switch means are connected in series with each other and to said second switch means while said contact means maintain said electric pump in a de-energized state, to a second operative position, in which said first switch means are connected in series to the respective said elements of said first group and said electric pump is energized via the respective said contact means.

3. A laundry washing machine as claimed in claim 2, wherein said second switch means is movable from first to second operative positions for selectively activating the respective said elements of said second group.

4. A laundry washing machine as claimed in claim 2, further comprising at least one motor for driving said drum and including respective windings for a high spinning speed and for a low washing speed, the latter said winding being adapted to be intermittently energized for rotation in opposite directions by means of a first inverter switch, and a second inverter switch for energizing said windings and adapted to be connected to said first inverter switch and to be activated through contact means associated with a single one of said first switch means.

5. A laundry washing machine as claimed in claim 4, wherein said motor is operable to drive said recirculation pump means.

6. A laundry washing machine as claimed in claim 1, wherein said heater means and said temperature control means are accommodated in said collector together with at least one filtering element disposed within the recirculation path of the washing liquid.

7. A laundry washing machine as claimed in claim 1, wherein said tub is supported by a substantially cruciform bracket provided with a hub portion for mounting therein a drive shaft of said drum, said hub portion is formed with an interior chamber communicating via a conduit with said outlet of said electric recirculation pump means, and said chamber communicating with the interior of said drum via axially extending bores formed in said shaft and via a number of conduits formed with perforations.