Apparatus and method for automatically injecting laundry treating chemicals into a commercial washing machine

• US 4,932,227 A
• Filed: 09/21/1988
• Issued: 06/12/1990
• Est. Priority Date: 09/21/1988
• Status: Expired due to Fees

• Current Assignee: Lever Brothers Company (Unilever PLC)
• Original Assignee: Lever Brothers Company (Unilever PLC)
• Inventors: Hogrefe, James T.
• Primary Examiner(s): Stinson, Frankie L.
• Application Number:
  US07/247,196
• Time in Patent Office: 629 Days
• Field of Search: 68/17 R, 68/207, 68/12 R, 134/57 D, 222/1, 222/59, 222/651
• US Class Current: 68/17.00R
• CPC Class Codes: D06F 39/022 in a liquid state D06F39/024 takes precedence

Abstract

An apparatus for cleaning fabrics includes a washing machine having a housing, a wash chamber, hot and cold water inlet conduits in the housing leading to the chamber, and at least one laundry chemical inlet conduit. Water flow sensing means are placed in the hot and cold water lines, respectively, located outside of the housing. The flow of water generates a signal in the sensing means which then sends an electronic impulse to a control head having a program that stores and selectively activates a plurality of pumps. These pumps deliver laundry chemicals from supply containers into the wash chamber of the machine.

Claims

1. An apparatus for washing fabrics in a washing sequence, the apparatus comprising:

a washing device having;

a housing;

a wash chamber in said housing;

a hot and a cold inlet conduit in said housing communicating with said chamber; and

at least one laundry treating chemical inlet conduit in said housing communicating with said chamber; and

a hot water line outside said housing connecting a source of hot water to said hot water inlet conduit;

a cold water line outside said housing connecting a source of cold water to said cold water inlet conduit;

at least two sensing means for sensing a flow of water and converting a flow signal therefrom into an electronic impulse to thereby sense each stage of the washing sequence, a first of said means connected to and sensing a flow in said hot water line and a second of said means connected to and sensing a flow in said cold water line;

a plurality of pumps;

a control head receiving and storing said electronic impulses and comprising a program to selectively activate said plurality of pumps;

a plurality of laundry treating chemical supply containers, one of said containers holding a detergent, said chemical supply containers being located outside said housing; and

at least one conduit connecting said supply containers to said at least one laundry treating chemical inlet conduit, said pumps activating transfer of detergent through said conduit.

2. An apparatus according to claim 1 further comprising a wash program selector in said housing and a means for communicating between said wash program selector and said control head.

3. An apparatus according to claim 1 wherein said sensing means continuously generates an electronic impulse over the period of time that there is any flow of water in the respective hot and cold water lines.

4. An apparatus according to claim 1 wherein said program has at least one step which upon receipt of an electronic impulse does not instruct any of said pumps to be activated and thereby does not cause dispensing of a laundry treating chemical into said wash chamber.

5. An apparatus according to claim 1 wherein one of said chemical supply containers holds a fabric softener and said fabric softener is delivered as the last chemical in a washing sequence.

6. An apparatus according to claim 1 wherein said supply containers hold one or more chemicals selected from the group consisting of fabric softeners, bleaches, souring agents, alkali, fluorescent whitening agents, anti-redeposition agents, perfumes and mixtures thereof.

7. A method for delivering laundry treating chemicals utilizing the washing device as claimed in claim 1 wherein the method comprises:

installing a sensing means for sensing a flow of hot water in a line connecting a source of hot water to the hot water inlet conduit of the washing device;

installing a sensing means for sensing a flow of cold water in a line connecting a source of cold water to the cold water inlet conduit of the washing device;

converting a water flow signal sensed by said sensing means into an electronic impulse;

sending said electronic impulse to a control head which receives and stores said impulse;

activating a program in said control head through said electronic impulse;

activating one or more pumps through said program; and

delivering a detergent and other laundry treating chemicals from their supply containers to the wash chamber of the washing device by the action of the activated pump.