CN-121987377-A - Toothbrush head for electric toothbrush

CN121987377ACN 121987377 ACN121987377 ACN 121987377ACN-121987377-A

Abstract

The invention provides a toothbrush head for an electric toothbrush. The toothbrush head comprises a handle portion, a brush disc and a swing rod, wherein the handle portion is provided with a proximal end and a distal end, the distal end is connected to a handle main body of the electric toothbrush, the brush disc is rotatably arranged at the proximal end of the handle portion, the swing rod is arranged in the handle portion and swings around a rotation axis L1 to drive the brush disc to do reciprocating rotation, the toothbrush head further comprises a brush head permanent magnet and an elastic piece, the brush head permanent magnet is fixed to the swing rod, the elastic piece is arranged to apply elastic force between the handle portion and the swing rod, the brush head permanent magnet comprises a first brush head permanent magnet portion and a second brush head permanent magnet portion, the first brush head permanent magnet portion and the second brush head permanent magnet portion are provided with magnetic pole faces with opposite polarities towards the distal end of the handle portion, the magnetic pole faces provide non-contact magnetic coupling, and the first brush head permanent magnet portion and the second brush head permanent magnet portion are arranged in a radial offset mode relative to the rotation axis L1. The adoption of the toothbrush head can effectively improve the noise and vibration of the electric toothbrush and reduce the energy loss.

Inventors

DAI XIAOGUO
ZHANG CHANGJIN

Assignees

戴晓国
上海携福电器有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A brush head for an electric toothbrush, the brush head comprising: A handle portion having a proximal end and a distal end, the distal end configured to be connected to a handle body of the electric toothbrush; a brush disc rotatably disposed at the proximal end of the handle portion, and The proximal end of the swing rod is connected to the brush disc, and the swing rod is arranged in the handle rod part and swings reciprocally around a rotation axis L1 to drive the brush disc to rotate reciprocally; It is characterized in that the method comprises the steps of, The toothbrush head further comprises a brush head permanent magnet fixed to the swing rod and an elastic member arranged between the handle portion and the swing rod to apply an elastic force The brush head permanent magnet comprises a first brush head permanent magnet part and a second brush head permanent magnet part, the first brush head permanent magnet part and the second brush head permanent magnet part are provided with magnetic pole faces with opposite polarities towards the far end of the handle rod part, And the first and second brushhead permanent magnet portions are disposed radially offset relative to the axis of rotation L1.
2. The toothbrush head of claim 1, wherein the pole faces of the first and second head permanent magnet portions provide a non-contact magnetic coupling, the other pole face opposite the pole face being shorted by a shorting magnetizer, the shorting magnetizer being secured to the pendulum bar.
3. The toothbrush head of claim 1, wherein the handle portion comprises a housing and a bushing disposed within a distal end of the housing, the bushing having a pivot portion pivotally connected to the swing link, The bushing has a hollow sized to receive a movable drive shaft permanent magnet disposed on the drive shaft of the handle body, the central axis of the drive shaft permanent magnet within the hollow being parallel to but not coincident with the swing axis L1 of the swing link.
4. A toothbrush head according to claim 3 characterised in that a through hole is formed in the proximal end wall of the sleeve, the head permanent magnet being inserted close to or at least partially into the through hole so that the magnetic pole face of the head permanent magnet is exposed towards or close to the hollow of the sleeve.
5. The toothbrush head according to claim 1 wherein the pole faces of the head permanent magnets always face the pole faces of the drive shaft permanent magnet with a gap therebetween when a drive shaft permanent magnet provided on the drive shaft of the handle body is received inside the handle shaft portion.
6. The toothbrush head of claim 1, wherein the elastic member is a coil spring disposed radially adjacent to the head permanent magnet, a first fixed end of the coil spring being secured to the swing link, and a second fixed end of the coil spring being secured to the handle portion.
7. The toothbrush head of claim 6, wherein a distal end of the oscillating bar is provided with an oscillating bar pivot, and the helical spring is sleeved on the oscillating bar pivot.
8. The toothbrush head according to claim 1, wherein the elastic member is a leaf spring, a first fixed end of the leaf spring is fixed to the swing link, a second fixed end of the leaf spring is fixed to the handle portion through a leaf spring holder, The plate springs are arranged parallel to the swing rod or perpendicular to the swing rod, and the plate springs and the brush head permanent magnets are axially arranged.
9. The toothbrush head of claim 8, further comprising a leaf spring holder, the leaf spring holder being wedge-shaped, the leaf spring holder tapering in axial cross-section from distal to proximal, The inner wall of the handle part is provided with a concave part matched with the shape, and the plate spring retainer and the handle part are fixed through the shape matching.
10. The toothbrush head of claim 1, wherein the first and second head permanent magnet portions are disposed in pairs about a median plane of oscillation of the pendulum rod, the oppositely polarized pole faces of the first and second head permanent magnet portions toward the distal end of the handle portion being on the same radial plane and having substantially the same size.

Description

Toothbrush head for electric toothbrush Technical Field The present invention relates to the technical field of personal care devices, and in particular to a toothbrush head for an electric toothbrush. Background In the current market, electric toothbrushes are of a wide variety, and they are mostly equipped with drive means capable of reciprocating movement, which are connected to the cleaning members of the toothbrush head to perform the cleaning action. An electric toothbrush is characterized in that a permanent magnet is arranged on a driving shaft of a handle. When the toothbrush head is in butt joint with the handle, the permanent magnet is attracted with the moving assembly in the toothbrush head through magnetic force, and the brush disc of the toothbrush head is driven to rotate in a reciprocating mode along with the reciprocating motion of the driving device in the handle. However, the design of such electric toothbrushes has a problem in that there is a direct mechanical connection between the drive shaft of the handle and the moving parts of the toothbrush head. At high speeds, small periodic relative movements may occur at the joint, which not only results in energy losses, but also generates high frequency noise. In the face of consumer's improvement to electric toothbrush use experience requirement, the high frequency noise and vibration that the electric toothbrush produced in the use of reduction is urgently needed in the market, reduces the energy loss simultaneously. Disclosure of Invention To overcome the deficiencies of the prior art, the present invention provides a toothbrush head for an electric toothbrush, the toothbrush head comprising a handle portion having a proximal end and a distal end, the distal end being configured to be connected to a handle body of the electric toothbrush, a brush plate rotatably disposed at the proximal end of the handle portion, and a swing link, the proximal end of the swing link being connected to the brush plate and the swing link being disposed within the handle portion to swing about an axis of rotation L1 to effect reciprocal rotation of the brush plate, wherein the toothbrush head further comprises a head permanent magnet secured to the swing link and an elastic member arranged to exert an elastic force between the handle portion and the swing link, the head permanent magnet comprising a first head permanent magnet portion and a second head permanent magnet portion, the first head permanent magnet portion and the second head permanent magnet portion having oppositely polarized magnetic pole faces toward the distal end of the handle portion, the magnetic pole faces providing a non-contact magnetic coupling, the first head permanent magnet portion and the second head permanent magnet portion being disposed radially offset with respect to the axis of rotation L1. According to one aspect of the invention, the other pole face of the first and second brush head permanent magnet portions opposite the pole face is shorted by a shorting magnetizer that is held on the swing link. According to yet another aspect of the invention, the handle portion comprises a housing and a bushing disposed within the distal end of the housing, the bushing being provided with a pivot portion pivotally connecting the pendulum bar, the bushing having a hollow portion sized to receive a movable drive shaft permanent magnet disposed on a drive shaft of the handle body, the axis of motion of the drive shaft permanent magnet being parallel to but non-coincident with the pendulum bar's swing axis L1. According to a further aspect of the invention, a through hole is formed in the proximal end wall of the sleeve, and the brushhead permanent magnet is inserted adjacent to or at least partially into the through hole such that the pole faces of the brushhead permanent magnet face distally and adjacent to the hollow portion of the sleeve. According to yet another aspect of the invention, the pole faces of the brush head permanent magnets always face the pole faces of the drive shaft permanent magnet poles with a gap therebetween when the drive shaft permanent magnets are received within the handle portion. According to a further aspect of the invention, the resilient member is a coil spring arranged radially offset with respect to the permanent magnet of the brush head, a first fixed end of the coil spring being fixed to the pendulum rod and a second fixed end of the coil spring being fixed to the handle portion. Preferably, the far end of the swing rod is provided with a swing rod pivot, and the spiral spring is sleeved on the swing rod pivot. According to still another aspect of the present invention, the elastic member is a plate spring, a first fixed end of the plate spring is fixed to the swing lever, a second fixed end of the plate spring is fixed to the handle portion through the plate spring holder, the plate spring is arranged parallel to the swing lever or perpendicular to the