Capacitive sensing faucet including a conductive polymer

Patent metadata

Field	Value
Publication number	US-9243390-B2
Application number	US-201414199267-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 14, 2013
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A capacitive sensing faucet is provided. In one exemplary embodiment, the faucet includes a a faucet body hub; a spout coupled to the faucet body hub; an insulator defining a capacitive coupling between the faucet body hub and the spout, wherein the insulator is formed from an electrically conductive polymer; a capacitive sensor having an electrode coupled to the faucet body hub; and a controller coupled to the capacitive sensor, the controller determining if the spout is touched by a user based on an output signal from the capacitive sensor.

First claim

The invention claimed is:

1. A faucet comprising:
a faucet body hub;
a spout coupled to the faucet body hub;
an insulator defining a capacitive coupling between the faucet body hub and the spout, wherein the insulator is formed from an electrically conductive polymer;
a capacitive sensor having an electrode coupled to the faucet body hub; and
a controller coupled to the capacitive sensor, an output signal from the capacitive sensor being supplied to the controller.

2. The faucet of claim 1 , wherein the controller determines if the spout is touched by a user based on the output signal from the capacitive sensor.

3. The faucet of claim 1 , wherein the insulator allows rotation of the spout about the faucet body hub.

4. The faucet of claim 1 , wherein the electrically conductive polymer comprises a polymer and an electrically conductive filler.

5. The faucet of claim 4 , wherein the polymer is polyoxymethylene.

6. The faucet of claim 4 , wherein the electrically conductive filler is selected from the group consisting of carbon powder, carbon black, carbon fiber, carbon nanotubes, graphite, and metallic additives.

7. The faucet of claim 4 , wherein the polymer further comprises a lubricant.

8. The faucet of claim 1 , further comprising:
a manual valve handle movably coupled to the faucet body hub to control a manual valve, the manual valve handle being electrically coupled to the faucet body hub;
wherein the controller further determines if the manual valve handle is touched by a user based on the output signal from the capacitive sensor.

9. The faucet of claim 8 , wherein the controller uses the output signal from the capacitive sensor to distinguish between when the manual valve handle is tapped by the user, when the manual valve handle is grabbed by the user, when the spout is tapped by the user, and when the spout is grabbed by the user to control operation of the faucet in different modes.

10. The faucet of claim 8 , wherein the faucet comprises a single hole mount faucet.

11. The faucet of claim 8 , wherein a first output signal change is detected by the controller when the manual valve handle is touched by the user, and a second output signal change is detected by the controller when the spout is touched by the user, the first output signal change being greater than the second output signal change.

12. The faucet of claim 11 , wherein a magnitude of the second output signal change is about 40% of a magnitude of the first output signal change.

13. A faucet comprising:
a faucet body hub;
a manual valve supported by the hub, the valve including a movable valve stem;
a manual valve handle movably supported by the hub and operably coupled to the valve stem to control the manual valve, the manual valve handle including a user input member;
a spout supported by the hub; and
a capacitive coupling defined by an insulator positioned intermediate the hub and one of the spout and the handle, wherein the insulator is formed from an electrically conductive polymer.

14. The faucet of claim 13 , further comprising:
a capacitive sensor coupled to the hub; and
a controller operably coupled to the capacitive sensor, the controller determining which of the user input member of the manual valve handle and the spout is touched by a user based on an output signal from the capacitive sensor.

15. The faucet of claim 13 , wherein the hub includes a base and an upwardly extending inner member concentrically received within the spout, and the insulator includes a side wall positioned intermediate the inner member and the spout.

16. The faucet of claim 13 , wherein the capacitive coupling is defined by the insulator positioned intermediate the hub and the user input member of the handle.

17. The faucet of claim 16 , wherein the insulator allows rotation of the spout about the faucet body hub.

18. The faucet of claim 13 , wherein the electrically conductive polymer comprises a polymer and an electrically conductive filler.

19. The faucet of claim 18 , wherein the polymer is polyoxymethylene.

20. The faucet of claim 18 , wherein the electrically conductive filler is selected from the group consisting of carbon powder, carbon black, carbon fiber, carbon nanotubes, graphite, and metallic additives.

21. The faucet of claim 18 , wherein the electrically conductive filler is a carbon powder.

22. The faucet of claim 18 , wherein the polymer further comprises a lubricant.

23. The faucet of claim 14 , wherein the controller uses the output signal from the capacitive sensor to distinguish between when the user input member of the handle is tapped by the user, when the user input member of the handle is grabbed by the user, when the spout is tapped by the user, and when the spout is grabbed by the user to control operation of the faucet in different modes.

24. The faucet of claim 13 , wherein the faucet comprises a single hole mount faucet.

25. The faucet of claim 14 , wherein a first output signal change is detected by the controller when the user input member of the handle is touched by the user, and a second output signal change is detected by the controller when the spout is touched by the user, the first output signal change being greater than the second output signal change.

26. The faucet of claim 25 , wherein a magnitude of the second output signal change is about 40% of a magnitude of the first output signal change.

27. The faucet of claim 13 , wherein the faucet body hub and at least one of the manual valve handle and the spout is formed of an electrically conductive polymer.

28. The faucet of claim 13 , wherein the faucet body hub and at least one of the manual valve handle and the spout further includes an electrically conductive coating.

29. The faucet of claim 28 , wherein the capacitive coupling includes the electrically conductive coating of the faucet body hub and the electrically conductive coating of the at least one of the manual valve handle and the spout.

30. The faucet of claim 28 , wherein the electrically conductive coating includes a metallic powder.

Assignees

• Masco Corp
• Delta Faucet Co

Inventors

• Rosko Michael Scot
• Sawaski Joel D
• Nelson Alfred C

Classifications

• E03C1/057

  touchless, i.e. using sensors · CPC title

• E03C1/055 Primary

  Electrical control devices, e.g. with push buttons, control panels or the like · CPC title

• Y10T137/9464

  Faucets and spouts · CPC title

• Y10T137/1842

  Ambient condition change responsive · CPC title

• F16K21/00

  Fluid-delivery valves, {e.g. self-closing valves}(for liquid handling B67D; for flushing devices for water-closets or the like E03D) · CPC title