Liquid dispensing module

• US 4,921,129 A
• Filed: 07/11/1988
• Issued: 05/01/1990
• Est. Priority Date: 07/11/1988
• Status: Expired due to Fees

• Current Assignee: Danny Lemberg, Pacific Bio Systems Incorporated, Shelby A. Carl
• Original Assignee: Pacific Bio Systems Incorporated
• Inventors: Caldwell, Richard J., Jones, K. Tom
• Primary Examiner(s): Shaver, Kevin P.
• Assistant Examiner(s): Bollinger, David H.
• Application Number:
  US07/217,303
• Time in Patent Office: 659 Days
• Field of Search: 222/51, 222/23, 222/64, 222/66, 222/147, 222/165, 222/325, 222/192, 137/558, 73/304 R, 116/227, 239/74, 239/310, 239/375, 134/113, 134/117, 134/199, 128/65, 128/66
• US Class Current: 222/23
• CPC Class Codes: A47L 15/44 Devices for adding cleaning agents; Devices for dispensing cleaning agents, rinsing aids or deodorants
• CPC Class Codes: D06F 39/022 in a liquid state D06F39/024 takes precedence
• CPC Class Codes: G01F 23/242 Mounting arrangements for electrodes
• CPC Class Codes: Y10T 137/8342 Liquid level responsive indicator, recorder or alarm

Abstract

A disposable liquid dispensing module in the form of a hollow plastic container for holding liquid, such as a cleaning solution or soap, has at least one liquid level sensing probe permanently mounted in it. The module is made to be inserted into a lavage machine or similar apparatus and includes a connector to which a connection plug having a liquid withdrawal pipe and connectors to the liquid level sensing probe is attached. The pipe is connected to an elongated flexible tube and the connectors for the liquid level sensing probe are connected to flexible wires, so that the plug including these components may be attached to the container outside the lavage machine in which it is used. When the level of liquid falls below a predetermined threshold, a signal is provided to the apparatus indicating that replacement of the container is to be made. The entire module then is withdrawn and the plug to the apparatus is disconnected. The original module is discarded and a new module filled with cleaning solution is attached to the plug and placed in the machine.

Claims

1. A system for dispensing liquid from a disposable liquid dispensing module to equipment having apparatus for withdrawing liquid from such module, the system including in combination:

a hollow container for holding liquid to be dispensed;

liquid level sending means permanently mounted in said container for sensing when the level of liquid in said container is less than a predetermined minimum threshold;

a liquid withdrawal opening for connection to apparatus for withdrawing liquid;

indicator coupling means attached to said sensing means;

removable plug means;

a liquid withdrawal pipe and at least one indicator connector means mechanically mounted together in said removable plug means having dimensions such that when said plug means is interconnected with said hollow container, said pipe extends through the liquid withdrawal opening in said container, and said indicator connector means is releasably interconnected with said indicator coupling means; and

means for closing said withdrawal opening during shipping and storage of such container.

2. The combination according to claim 1 wherein said pipe in said plug means is coupled with a flexible hose for withdrawing liquid, and said indicator connector means is connected to a flexible electrical wire.

3. The combination according to claim 2 wherein said liquid level sensing means comprises a pair of spaced-apart conductive probes having different lengths for establishing said predetermined minimum threshold;

and said coupling means comprises means for releasably connecting each of said probes with said indicator connector means.

4. The combination according to claim 3 wherein said container has a top and a bottom;

and further including a sump portion in the bottom of said container comprising the lowest point in said container when said container is used; and

wherein said liquid level sensing means is located at least in part in said pump portion.

5. The combination according to claim 4 wherein said means for closing said withdrawal opening during shipping and storage of said container is removed when said plug means is interconnected with said container.

6. The combination according to claim 5 further including a handle on said container.

7. The combination according to claim 6 wherein said container has a top and a bottom and at least first and second ends;

and said handle is located on said first end thereof.

8. The combination according to claim 7 wherein the length and width of said container are less than the height thereof.

9. The combination according to claim 8 wherein the cross-section across the width of said container is substantially rectangular, the height of said container is substantially less than the width thereof, and the length of said container is substantially greater than the width thereof.

10. The combination according to claim 9 wherein said hollow container is made of plastic.

11. The combination according to claim 2 wherein said liquid level sensing means comprises at least one electrically conductive probe extending into said container spaced from said withdrawal pipe when said withdrawal pipe extends into said container;

and said withdrawal pipe is made of electrically conductive material, with said indicator connector means coupled to said pipe and to said probe for providing an indication of the conductivity therebetween.

12. The combination according to claim 11 wherein said container has a top and a bottom;

and further including a sump portion in the bottom of said container comprising the lowest point in said container when said container is used; and

wherein said liquid level sensing means is located at least in part in said sump portion.

13. The combination according to claim 12 wherein said conductive pipe has a length greater than the length of said conductive probe, with said conductive pipe extending into said sump.

14. The combination according to claim 1 wherein said liquid level sensing means comprises spaced apart electrical conductive probes.

15. The combination according to claim 14 wherein said container has a top and a bottom;

and further including a sump portion in the bottom of said container comprising the lowest point in said container when said container is used; and

wherein said liquid level sensing means is located at least in part in said sump portion.

16. The combination according to claim 15 wherein at least one of said probes extends into said sump portion.

17. The combination according to claim 1 wherein said hollow container is made of plastic.

18. The combination according to claim 17 further including a handle on said container.

19. The combination according to claim 18 wherein said container has a top and a bottom and at least first and second ends;

and said handle is located on said first end thereof.

20. The combination according to claim 19 wherein the cross-section across the width of said container is substantially rectangular, the height of said container is substantially less than the width thereof, and the length of said container is substantially greater than the width thereof.

21. The combination according to claim 1 wherein said liquid level sensing means comprises at least one electrically conductive probe extending into said container spaced from said withdrawal pipe when said withdrawal pipe extends into said container;

and said withdrawal pipe is made of electrically conductive material, with said indicator connector means coupled to said pipe and to said probe for providing an indication of the conductivity therebetween.