Fluid-dispensing and refilling system for a power toothbrush

• US 6,220,772 B1
• Filed: 09/24/1999
• Issued: 04/24/2001
• Est. Priority Date: 01/13/1999
• Status: Expired due to Fees

• Current Assignee: Philips Oral Healthcare Incorporated (Koninklijke Philips N.V.)
• Original Assignee: Optiva Corp. (Koninklijke Philips N.V.)
• Inventors: Taylor, Richard K.
• Primary Examiner(s): Eloshway, Charles R.
• Application Number:
  US09/404,972
• Time in Patent Office: 578 Days
• Field of Search: 401/146, 401/149, 401/150, 401/274, 401/286, 401/289, 401/176, 401/179, 15/221, 433/216, 417/211, 417/469, 921/62.R
• US Class Current: 401/176
• CPC Class Codes: A61C 17/227 with reservoirs, e.g. for toothpaste
• CPC Class Codes: A61C 17/36 with rinsing means

Abstract

A pump used in a power toothbrush for fluid delivery to the bristles. The pump moves fluid provided to it to a dispensing valve located in the brushhead. The pump includes a pump chamber with a piston ball located therein. The piston ball moves within the chamber in response to movement of the brushhead, moving fluid out a discharge end of the pump chamber under pressure. The pump includes a fluid exit channel which connects the discharge end of the pump chamber with an opening in the brushhead in which the dispensing valve is located.

Claims

1. A pump for use in a fluid delivery system for a power toothbrush, comprising:

a pump member for moving fluid provided thereto to a dispensing member located in a brushhead portion of the toothbrush, the pump member being adapted for location in the brushhead portion of the toothbrush, wherein the pump member includes a pump bore chamber having an inlet end and a discharge end and a piston member which moves within the chamber between the inlet and discharge ends in response to movement of the brushhead during operation of the toothbrush, wherein fluid entering the pump bore chamber at the inlet end moves therealong under the action of the piston member and out the discharge end thereof, the pump member further including a fluid exit channel portion which extends away from the pump bore chamber at the discharge end thereof, the exit channel portion adapted to be connected to said dispensing member.

2. A pump of claim 1, wherein the pump bore chamber includes a concave surface at the discharge end thereof, the concave surface having approximately the same curvature as that of the piston member, the piston member being ball-shaped, wherein discharge of fluid from the pump bore chamber is through an outlet separate from the concave surface, and wherein the piston member in operation comes into contact with the concave surface at the end of a discharge part of a pumping cycle.

3. A pump of claim 2, wherein the concave surface is part of a plug which forms the discharge end of the pump bore chamber.

4. A pump of claim 1, including two projections which extend inwardly of the fluid exit channel from opposing longitudinal sides thereof, resulting in a narrowing of the width of the fluid exit channel, located between the discharge end of the pump bore and said opening in the brushhead portion.

5. A pump of claim 4, wherein the projections are tapered so that the width of the fluid exit channel decreases gradually over the length of the projections.

6. A pump article of claim 5, wherein the greatest width of the fluid exit channel is approximately 0.10 inches, and wherein the channel narrows to approximately 0.04 inches between the spaced projections.

7. A pump of claim 1, wherein the pump is defined by a cut-out portion within the brushhed and by a mating cover member covering the cut-out portion.

8. A pump of claim 1, wherein the piston element is made from tungsten carbide.

9. A pump for use in a fluid delivery system for an oral care device, comprising:

a pump member for moving fluid provided thereto to a dispensing member, the pump member being adapted for location in a moving end portion of the oral care device, wherein the pump member includes a pump bore chamber having an inlet end and a discharge end and a piston member which moves within the chamber between the inlet and discharge ends in response to movement of the end portion during operation of the oral care device, wherein fluid entering the pump bore chamber at the inlet end moves therealong under the action of the piston member and out the discharge end thereof, the pump member further including a fluid exit channel portion which extends away from the pump bore chamber at the discharge end thereof, the exit channel portion adapted to be connected to said dispensing member.

10. A pump of claim 9, wherein the pump bore chamber includes a concave surface at the discharge end thereof, the concave surface having approximately the same curvature as that of the piston member the piston member being ball-shaped, wherein discharge of fluid from the pump bore chamber is through an outlet separate from the concave surface, and wherein the piston member in operation comes into contact with the concave surface at the end of a discharge part of a pumping cycle.

11. A pump of claim 10, wherein the concave surface is part of a plug which forms the discharge end of the pump bore chamber.

12. A pump of claim 9, including two projections which extend inwardly of the fluid exit channel from opposing longitudinal sides thereof, resulting in a narrowing of the width of the fluid exit channel, located between the discharge end of the pump bore and said opening in the end portion.

13. A pump of claim 12, wherein the projections are tapered so that the width of the fluid exit channel decreases gradually over the length of the projections.

14. A pump of claim 13, wherein the greatest width of the fluid exit channel is approximately 0.10 inches, and wherein the channel narrows to approximately 0.04 inches between the spaced projections.

15. A pump of claim 9, wherein the pump is defined by a cut-out portion within the end portion and by a mating cover member covering the cut out portion.

16. A pump of claim 9, wherein the piston element is made from tungsten carbide.