ELECTRIC TOOTHBRUSH

• US 20180055616A1
• Filed: 08/30/2017
• Published: 03/01/2018
• Est. Priority Date: 08/31/2016
• Status: Active Grant

• Current Assignee: Ningbo Aolbea Oral Care Products Co., Ltd.
• Original Assignee: Ningbo Aolbea Oral Care Products Co., Ltd.
• Inventors: ZHENG, Jianli, XIONG, Sijun
• Granted Patent: US 10,617,501 B2
• Time in Patent Office: Days
• CPC Class Codes: A46B 9/04 Arranged like in or for toothbrushes
• CPC Class Codes: A61C 17/225 Handles or details thereof

Abstract

A electric toothbrush comprises a handle and a brush head. A motor is arranged in the handle and a transmission rod is arranged in the brush head. The motor has a rotating shaft, which extends from a casing of the motor. A transmission connection member is arranged between the transmission rod and the rotating shaft of the motor, one end of the transmission connection member is connected with the rotating shaft, the other end is connected with the transmission rod. A sealing member surrounding the rotating shaft is arranged at the rotating shaft extending position of the outer surface of the casing. The sealing member extends from the outer surface of the casing of the motor to the transmission connection member, and a gap between the inside of the sealing member and the rotating shaft constitutes a first cavity. A second cavity is formed between the sealing member and a sleeving cavity of the transmission connection member.

Claims

1. An electric toothbrush, comprising a handle and a brush head, a motor being arranged in the handle, a transmission rod being arranged in the brush head, the motor being provided with a rotating shaft, the rotating shaft extending from a casing of the motor, a transmission connection member being arranged between the transmission rod and the rotating shaft of the motor, one end of the transmission connection member being connected with the rotating shaft, the other end being connected with the transmission rod, and a sealing member surrounding the rotating shaft being arranged at the rotating shaft extending position of the outer surface of the casing, wherein the sealing member extends from the outer surface of the casing of the motor to the transmission connection member, and a gap between the inside of the sealing member and the rotating shaft constitutes a first cavity;

an end face, facing the rotating shaft, of the transmission connection member and the outer surface of the sealing member form rotatory sealing connection;

a second cavity is formed between the sealing member and a sleeving cavity of the transmission connection member.

2. The electric toothbrush according to claim 1, wherein the sealing member is a cylindrical thin casing of which one end is opening, the opening end of the thin casing faces the motor, the inner diameter of the sealing member is larger than the diameter of the rotating shaft, the rotating shaft penetrates through the axle hole of the bottom of the thin casing, and the opening end of the sealing member extends outwardly from a sealing flange.

3. The electric toothbrush according to claim 2, wherein the inside of the handle is provided with a fixation wall facing the motor, and the fixation wall is abutted against the sealing flange to compress the sealing member to be hermetically abutted against the casing of the motor.

4. The electric toothbrush according to claim 1, wherein an end face, facing the rotating shaft, of the transmission connection member is also provided with a sleeving cavity sleeving the sealing member, the sleeving cavity sleeves the cylindrical surface of the sealing member from the outside, and the outer surface of the sealing member and the sleeving cavity form rotatory sealing connection.

5. The electric toothbrush according to claim 4, wherein the cylindrical outer surface of the sealing member is circumferentially provided with seal ribs.

6. The electric toothbrush according to claim 5, wherein three seal ribs are arranged.

7. The electric toothbrush according to claim 1, wherein the first cavity is filled with sealing oil.

8. The electric toothbrush according to claim 1, wherein a spacing is kept between the end face of the sealing member and the bottom surface of the sleeving cavity, and the outside of the end face of the sealing member and the sleeving cavity enclose a second cavity.

9. The electric toothbrush according to claim 8, wherein the second cavity is filled with the sealing oil.

10. The electric toothbrush according to claim 1, wherein the bottom surface of the sealing member is of a conical structure protruding towards the transmission connection member.

11. The electric toothbrush according to claim 1, wherein the inside of the second cavity is also provided with an obstruction rib which is arranged in a manner that the outer surface of the sealing member is protruded and surrounds the rotating shaft, and a gap is kept between the top surface of the obstruction rib and the inner surface of the sleeving cavity.

12. The electric toothbrush according to claim 5, wherein the inner surface of the sleeving cavity of the transmission connection member and the seal ribs are abutted and simultaneously keep mutual rotation.

13. The electric toothbrush according to claim 3, wherein the end part of the fixation wall is abutted against the sealing flange of the sealing member, and compresses the sealing flange of the sealing member to be abutted against the casing of the motor.

14. The electric toothbrush according to claim 3, wherein the fixation wall extends towards an inner lower direction from a port of the handle, and the sealing flange extends from the lower port of the sealing member to the outside of the fixation wall along an outer radial direction.

15. The electric toothbrush according to claim 4, wherein the lower end of the sleeving cavity is opening, the lower end of the sleeving cavity is of a stepped shape having a large-diameter upper end and a small-diameter lower end, the opening end sleeves the rotating shaft, the upper end of the rotating shaft is inserted into the upper-end cavity of the sleeving cavity, and the sealing members are arranged between the lower-end cavity and the outer surface of the casing of the motor and between the lower-end cavity and the rotating shaft.