Electric double-head counter-rolling toothbrush head structure

Abstract

An electric double-head counter-rolling toothbrush head structure comprises two brush head bodies, a transmission component, a hollow neck and a back shell. The transmission component is used for connecting the brush head bodies with the output end of a motor. The back shell comprises a side wall and a back wall. The side wall is arranged on the periphery of the back wall in an encircling mode, and is connected with the back wall. An accommodating cavity is formed in the back shell. The two brush head bodies are arranged in the accommodating cavity. The top end of the neck is fixedly connectedwith the back shell. A through hole communicated with an inner cavity of the neck is formed in the side wall of the back shell. The transmission component passes through the through hole downwards toenter the inner cavity of the neck. Compared with conventional double-head counter-rolling toothbrushes, the electric double-head counter-rolling toothbrush head structure has the advantages that discomfort caused by the fact that reverse sides of the brush head bodies rub oral cavity walls and impact on teeth can be avoided, vibration generated during rotation of the brush head bodies can be relieved, and frictional noise can be reduced; the brush head thickness can be basically equivalent to that of conventional manual toothbrushes, thinner brush heads can easily extend into oral depths, and the tooth brushing effect is better.

Description

technical field [0001] The invention relates to the technical field of personal cleaning appliances, in particular to a brush head structure of an electric double-head counter-rolling toothbrush. Background technique [0002] Chinese patent document CN109223231A discloses a variety of brush head structures for electric counter-rolling toothbrushes. These brush heads disclosed in the document are simplified in transmission structure compared with previous counter-rolling toothbrush heads, and the overall structure of the brush head has also become more compact. , which is conducive to the reduction of mass production costs. [0003] However, there are still the following problems in the scheme disclosed in the above-mentioned patent documents: 1. When brushing teeth, the two brush head bodies rotate, and the back of the brush head body will contact and rub against the oral cavity wall during the movement, which affects the comfort of brushing teeth Spend. Since the interlac...

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Problems solved by technology

[0003] However, there are still the following problems in the scheme disclosed in the above-mentioned patent documents: 1. When brushing teeth, the two brush head bodies rotate, and the back of the brush head body will contact and rub against the oral cavity wall during the movement, which affects the comfort of brushing teeth Spend

On the back of the two brush head bodies, the interlaced parts are directly exposed, and there is a potential risk of damage to the inner wall of the oral cavity

In addition, during the brushing process, the back of the high-speed vibrating brush head may easily collide with the teeth, causing discomfort

2. In the brush heads disclosed in the above documents, the shaft connected to the brush body not only serves as a transmission shaft, but also serves as the rotation axis of the brush body. Since the shaft connected to the brush body requires Extending down to the handle, the length of the shaft is longer, and after the brush head body is connected to the shaft, most of the weight of the brush head body is located outside the shaft, such a design will easily cause the brush head body to rotate There is beating / vibration in the middle, so that the two brush head bodies rub against the contact part to generate noise

3. Since the rotation axis of the brush head body (that is, the aforementioned shaft) is located in the middle or on the inner side of the width direction (the so-called "inside" refers to the side where the tooth-shaped gap is opened on the brush head body, the so-called "outside" Refers to the position on the side opposite to the inner position. When the brush head body rotates, the movement range of the outer side is relatively large, and the outer side of the brush head body is also the part that will be in contact with the oral cavity wall. The outer wall of the brush head body is relatively large Friction against the oral wall, further affecting the comfort of brushing teeth

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