Process for the treatment of laundry in a washing machine

• US 4,794,661 A
• Filed: 03/06/1987
• Issued: 01/03/1989
• Est. Priority Date: 03/11/1986
• Status: Expired due to Term

• Current Assignee: Industrie Zanussi S.P.A. (AB Electrolux)
• Original Assignee: Zanussi Elettrodomestici SPA (Zanussi SpA)
• Inventors: Durazzani, Piero
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US07/022,871
• Time in Patent Office: 669 Days
• Field of Search: 8/158, 8/159, 68/12 R, 68/24, 68/58
• US Class Current: 8/158
• CPC Class Codes: D06F 35/006 for washing or rinsing only

Abstract

A process for treatment of laundry in a basket rotatably mounted in a tub of a washing machine by actuating a valve to introduce water into the tub from a hot water supply until the tub is partially filled so as to soak the laundry contained in the basket, rotating the basket first at low speed and in alternate directions for a predetermined period of time and then at high speed in a single direction for a predetermined period of time while simultaneously recirculating water from a collector below the basket back into the basket during rotation thereof, and discharging the liquid contained in the basket after rotation of the basket is stopped. The method of the present invention allows preheating of the laundry in the basket, the basket and the tub such that it is not necessary to reheat the washing liquid during a subsequent washing program.

Claims

1. A process for treatment of laundry in a basket rotatably mounted in a tub of a washing machine prior to the start of a washing program comprising:

introducing water into the tub from a hot water supply located externally from and connected to the washing machine until the tub is partially filled with the water so as to soak the laundry contained in the basket;

rotating the basket; and

recirculating the water in the washing machine to preheat the laundry in the basket, the basket and the tub of the washer, said steps of introducing water into the tub, rotating the basket and recirculating the water being performed without introducing detergent into the tub and being performed prior to the start of a washing program whereby the temperature of the water used in a subsequent washing program can be maintained at a desired temperature since the water introduced for the selected washing program will not be cooled to an undesirable temperature by contact with the laundry contained in the basket, the basket and the tub.

2. The process of claim 1, wherein the basket is rotated for a predetermined period of time in alternating direction at low speed.

3. The process of claim 1, wherein the basket is rotated for a predetermined period of time in a single direction at high speed.

4. The process of claim 1, wherein the basket is initially rotated for a predetermined period of time in alternating directions at low speed and then for a predetermined period of time in a single direction at high speed.

5. The process of claim 1, wherein water from a cold water supply is mixed with the water from the hot water supply during the step of partially filling the washing machine with water from the hot water supply.

6. The process of claim 5, wherein the water from the cold water supply is mixed with the hot water during preset time intervals.

7. The process of claim 1, wherein the water in the washing machine is recirculated simultaneously with rotation of the basket.

8. The process of claim 1, wherein the water in the washing machine is discharged from the washing machine after the basket is rotated for a predetermined period of time.

9. The process of claim 1, further comprising washing laundry in the tub of the washing machine by carrying out a washing program after completing said step of recirculating water in the washing machine to preheat the laundry.

10. The process of claim 1, further comprising washing laundry in the tub of the washing machine by carrying out a washing program after completing the step of recirculating water in the washing machine to preheat the laundry, the washing machine being free to any means for electrically heating water circulated therein, said steps of introducing water into the tub, rotating the basket and recirculating water in the washing machine being the only method by which the temperature of the water used in the washing program is prevented from being cooled to an undesirable temperature by contact with the laundry contained in the basket, the basket itself and the tub since the laundry in the basket, the basket and the tub are preheated by the steps introducing water into the tub, rotating the basket and recirculating the water in the washing machine