# US 12,765,983 B2 · Shaft sealing assembly of handheld device, front end waterproof assembly, and host device

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- Number: US 12,765,983 B2
- Document ID: US12765983B2
- Status: Granted
- Kind: B2
- Application number: 18/764,289
- Filed: 2024-07-04
- Published: 2025-06-12
- Granted: 2026-10-20
- Earliest claimed: 2023-12-11
- Assignees: Shenzhen Shuye Technology Co., Ltd.
- Applicants: Shenzhen Shuye Technology Co., Ltd.
- Inventors: Hongxin Ye
- Web page: https://patentgrep.com/patent/US12765983B2

## CPC

- A61C 17/225: {Handles or details thereof}
- F16J 15/3456: {without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip}
- F16J 15/32: with elastic sealings, e.g. O-rings
- F16J 15/3208: provided with tension elements, e.g. elastic rings
- F16J 15/3212: with metal springs
- A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

A shaft sealing assembly of a handheld device includes: a center shaft; and a movable sealing assembly, including a fixation seat and a movable sealing member. The fixation seat defines a sleeving hole, an inner circumferential surface of the sleeving hole defines an annular sealing slot, the sealing slot has a front wall surface and a rear wall surface opposite to the front wall surface in an axial direction. The movable sealing member is made of flexible material, the movable sealing member is received in the sleeving hole and extends into the sealing slot, the movable sealing member defines a fixation shaft hole which is sealed to and fixedly sleeves the center shaft, the movable sealing member is sealed to and rotatably mated to the front wall surface and the rear wall surface.

## Claims

### Claim 1

A shaft sealing assembly of an electric toothbrush, comprising:
a center shaft; and
a movable sealing assembly, comprising a fixation seat and a movable sealing member;
wherein the fixation seat defines a sleeving hole, an inner circumferential surface of the sleeving hole defines an annular sealing slot, the sealing slot has a front wall surface and a rear wall surface opposite to the front wall surface in an axial direction;
the movable sealing member is made of flexible material, the movable sealing member is received in the sleeving hole and extends into the sealing slot, the movable sealing member defines a fixation shaft hole which is sealed to and fixedly sleeves the center shaft, the movable sealing member is sealed to and rotatably mated to the front wall surface and the rear wall surface;
wherein the fixation seat comprises a base and a front cover fixedly connected to the base, the base and the front cover cooperatively enclose the sleeving hole and the sealing slot, the sleeving hole comprises a rear opening defined in the base and a front opening defined in the front cover, the front wall surface of the sealing slot is formed on the front cover, and the rear wall surface of the sealing slot is formed on the base;
wherein the base comprises a sealing cylinder, an inner periphery of the sealing slot is formed on the sealing cylinder, an inner wall surface of a front end of the sealing cylinder defines an annular slot; the front cover comprises a cover plate and an inner stopping port, the cover plate covers an opening at a front side of the sealing cylinder, the inner stopping port is annular and protrudes from a rear side of the cover plate, the inner stopping port is mated to be embedded in the annular slot;
wherein the base further comprises a positioning projection disposed on a front end face of the sealing cylinder, an outer edge of the front cover defines a positioning slot that is mated to the positioning projection;
wherein the positioning projection extends axially and protrudes from an outer circumferential surface of the sealing cylinder, and an inner wall surface of a static sealing member defines an insertion slot which is mated to the positioning projection.

### Claim 2

A front end waterproof assembly, comprising:
a housing, defining a cavity, wherein a front end face of the housing defines a sealing hole communicated to the cavity;
a static sealing member, received in and mated with the sealing hole, wherein the static sealing member defines a movable shaft hole communicated with the cavity; and
a shaft sealing assembly, comprising:
a center shaft; and
a movable sealing assembly, comprising a fixation seat and a movable sealing member;
wherein the fixation seat defines a sleeving hole, an inner circumferential surface of the sleeving hole defines an annular sealing slot, the sealing slot has a front wall surface and a rear wall surface opposite to the front wall surface in an axial direction; the movable sealing member is made of flexible material, the movable sealing member is received in the sleeving hole and extends into the sealing slot, the movable sealing member defines a fixation shaft hole which is sealed to and fixedly sleeves the center shaft, the movable sealing member is sealed to and rotatably mated to the front wall surface and the rear wall surface;
wherein the center shaft extends through the movable shaft hole and extends out of the housing, the center shaft is sealed to and rotatably mated with the movable shaft hole; and
the movable sealing assembly is received in the cavity and is disposed at a rear side of the static sealing member, the fixation seat is fixedly disposed relative to the housing;
wherein an outer circumferential surface of the fixation seat is arranged with a positioning projection extending in the axial direction, an inner wall surface of the static sealing member defines an insertion slot mated to the positioning projection.

### Claim 3

A shaft sealing assembly of an electric toothbrush, comprising:
a center shaft; and
a movable sealing assembly, comprising a fixation seat and a movable sealing member;
wherein the fixation seat defines a sleeving hole, an inner circumferential surface of the sleeving hole defines an annular sealing slot, the sealing slot has a front wall surface and a rear wall surface opposite to the front wall surface in an axial direction;
the movable sealing member is made of flexible material, the movable sealing member is received in the sleeving hole and extends into the sealing slot, the movable sealing member defines a fixation shaft hole which is sealed to and fixedly sleeves the center shaft, the movable sealing member is sealed to and rotatably mated to the front wall surface and the rear wall surface;
wherein the fixation seat comprises a base, the base comprises a sealing cylinder and a positioning projection disposed on a front end face of the sealing cylinder,
the positioning projection extends axially and protrudes from an outer circumferential surface of the sealing cylinder, and an inner wall surface of a static sealing member defines an insertion slot which is mated to the positioning projection.