Washing machine with means for preventing propagation of microorganism

• US 6,463,766 B2
• Filed: 01/29/2001
• Issued: 10/15/2002
• Est. Priority Date: 01/28/2000
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kojima, Kenji, Iwai, Takayoshi, Hatayama, Tsutomu, Koketsu, Tadaaki, Kubota, Tooru
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US09/770,241
• Publication Number:
  US 20010010165A1
• Time in Patent Office: 624 Days
• Field of Search: 68/121.8, 68/17.R, 682/07
• US Class Current: 68/12.18
• CPC Class Codes: D06F 2103/20 Washing liquid condition, e.g. turbidity
• CPC Class Codes: D06F 2105/60 Audible signals
• CPC Class Codes: D06F 34/22 Condition of the washing liquid, e.g. turbidity
• CPC Class Codes: D06F 34/28 Arrangements for program selection, e.g. control panels therefor; Arrangements for indicating program parameters, e.g. the selected program or its progress
• CPC Class Codes: D06F 35/004 using chlorine generators

Abstract

A washing machine includes a wash tub, a water-supply mechanism for supplying water into the wash tub, and a disposition section in which a solid antimicrobial agent containing an organic compound having a nitrogen-halogen atomic combination is disposed. The disposition section is provided in the water-supply mechanism. The antimicrobial agent is brought into contact with water thereby to release hypohalogenous acid into the water.

Claims

1. A washing machine comprising:

a wash tub;

a water-supply mechanism for supplying water into the wash tub; and

a disposition section in which a solid antimicrobial agent containing an organic compound having a nitrogen-halogen atomic combination is disposed, the disposition section being provided in the water-supply mechanism, the antimicrobial agent being brought into contact with water thereby to release hypohalogenous acid into the water.

2. The washing machine according to claim 1, wherein the organic compound comprises one or a mixture of a brominated hydantoine compound, a chlorinated hydantoine compound, and an iodinated hydantoine compound.

3. The washing machine according to claim 1, wherein the organic compound comprises a brominated isocyanuric compound.

4. The washing machine according to claim 1, wherein the water-supply mechanism includes a water-supply path for supplying the water from a water source to the wash tub, and the disposition section is provided in the midst of the water-supply path, and the washing machine further comprising a filter provided downstream with respect to a portion of the water-supply path on which the disposition section is provided.

5. The washing machine according to claim 1, wherein the water-supply mechanism includes a water-supply path for supplying the water from a water source to the wash tub, and the water-supply path includes an antimicrobial water supply path provided with the disposition section and a normal water supply path provided with no disposition section.

6. The washing machine according to claim 5, further comprising a control device selectively executing an antimicrobial water supply mode in which water having passed through the antimicrobial water path is supplied into the wash tub in a wash or rinse step and a normal water supply mode in which water having passed through the normal water path in the wash or rinse step, wherein the control device carries out the wash step or rinse step under the antimicrobial water supply mode for a longer time than under the normal water supply mode.

7. The washing machine according to claim 6, wherein the control device supplies into the wash tub the water having passed through the normal water supply path and thereafter supplies into the wash tub the water having passed through the antimicrobial water supply path under the antimicrobial water supply mode.

8. The washing machine according to claim 5, further comprising a measuring element measuring a number of times of an antimicrobial water supply operation in which the water is supplied through the antimicrobial water supply path into the wash tub and an informing element informing that the number of times of the antimicrobial water supply operation measured by the measuring element has reached a limit number of times.

9. The washing machine according to claim 5, further comprising a timing element measuring a time of an executed antimicrobial water supply operation in which the water is supplied through the antimicrobial water supply path into the wash tub and an informing element informing that the time measured by the timing element has reached a limit time.

10. The washing machine according to claim 5, further comprising a control device sequentially executing a wash step in which the water having passed through the normal water supply path is supplied into the wash tub so that a wash operation is carried out, a first rinse step in which the water having passed through the antimicrobial water supply path is supplied into the wash tub so that a rinse operation is carried out, and a second rinse step in which the water having passed through the normal water supply path is supplied into the wash tub so that a rinse operation is carried out.

11. The washing machine according to claim 5, further comprising a control device sequentially executing a first step in which the water having passed through the normal water supply path is supplied into the wash tub so that a wash operation is carried out, a second step in which a dehydration operation is carried out while the water having passed through the normal water supply path is supplied into the wash tub, and a third step in which the water having passed through the antimicrobial water-supply path is supplied into the wash tub so that a rinse operation is carried out.

12. The washing machine according to claim 1, wherein the water-supply mechanism includes a bathwater supply path provided for supplying bathwater into the wash tub, wherein the disposition section is provided in a midst of the bath water supply path.

13. The washing machine according to claim 1, wherein the antimicrobial agent has a predetermined dissolving speed when a water is at 25°

C., the dissolving speed being set so that an effective concentration of chloride contained in the water after contact with the antimicrobial agent is increased in a range of 0.1 ppm and 10 ppm relative to an effective concentration of chloride contained in the water before the contact with the antimicrobial agent.

14. The washing machine according to claim 1, wherein the water-supply mechanism includes a water supply path for supplying the water from a water source to the wash tub, and the water supply path is provided with a water reservoir, wherein the disposition section is provided in the water reservoir.

15. The washing machine according to claim 1, wherein the water-supply mechanism includes a pouring section for pouring water into the wash tub, wherein the disposition section is provided in the pouring section.

16. The washing machine according to claim 1, further comprising a cassette case allowing water to pass therethrough and detachably attached to the disposition section, wherein the antimicrobial agent is accommodated in the cassette case.

17. The washing machine according to claim 1, wherein the antimicrobial agent contains a rust-proofing component for a material of iron system.

18. The washing machine according to claim 1, wherein the water-supply mechanism includes a bathwater supply path provided for supplying bathwater into the wash tub and a tap water supply path provided for supplying tap water into the wash tub, the washing machine further comprising a control device selectively executing a bathwater supply operation in which water having passed through the bathwater supply path is supplied into the wash tub and a tap water supply operation in which water having passed through the tap water supply path is supplied into the wash tub, wherein a concentration of hypohalogenous acid contained in the water in a wash liquid during the bathwater supply operation is set to be higher than a concentration of hypohalogenous acid contained in the water in the washtub during the tap water supply operation.