CN214104722U - Electric toothbrush three-sided brush head adopting torsion springs - Google Patents

Abstract

The utility model relates to the field of machinary, concretely relates to electric toothbrush brush head. A three-sided brush head of an electric toothbrush adopting a torsion spring comprises a brush head, wherein the brush head comprises a brush head handle, a front brush plate, a rear brush plate and an upper brush plate. Through the design, the utility model provides a three-sided brush head of the electric toothbrush adopting the torsional spring, and the three-sided brush hair of the brush head is driven by the motor to move, thereby improving the cleaning effect of the teeth; and through the surrounding type effect that trilateral brush hair produced and along with the thickness change of incisor to the molar, the self-adaptation effect of brush hair automatic laminating satisfies the tooth cleaning demand of the crowd of different oral cavities and tooth sizes, and the design of trilateral brush hair has solved the clean problem in the region that the tooth inboard should not be brushed, avoids the production of various bad habits of brushing teeth, simplifies the process of brushing teeth, has improved the efficiency of brushing teeth.

Description

Electric toothbrush three-sided brush head adopting torsion springs

Technical Field

The utility model relates to the field of machinary, specifically, relate to electric toothbrush brush head.

Background

The brush head of the existing electric toothbrush only has one side of brush hair, and because the upper and lower rows of teeth are convex, the upper side and the inner side of the teeth are not easy to be effectively cleaned, and a tooth brushing blind area is easy to form; when brushing teeth, must clean teeth through brush hair friction tooth surface, however current electric toothbrush can only drive the vibrations of the one side brush hair of brush head or rotate through the motor, and is not good to the cleaning effect of tooth, needs the first direction of many times conversion brush, just can clean the outside of tooth, inboard and the surface of grinding one's teeth in a molar manner, wastes time and energy, and forms bad brush teeth custom easily.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric toothbrush three-sided brush head adopting a torsional spring to solve at least one technical problem.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a three-sided brush head of an electric toothbrush adopting a torsional spring comprises a brush head and is characterized in that the brush head comprises a brush head handle, a front brush plate, a rear brush plate and an upper brush plate, wherein brush hair is arranged on the rear side surface of the front brush plate, brush hair is arranged on the front side surface of the rear brush plate, and brush hair is arranged on the lower side surface of the upper brush plate;

the front part of the brush head handle is provided with a first mounting groove, a first fixed shaft and a rotating part are arranged in the first mounting groove, a first rotating shaft hole for penetrating through the first fixed shaft is formed in the middle of the rotating part, an embedded groove is formed in the front part of the rotating part, a block-shaped bulge matched with the embedded groove is formed in one side of the first fixed shaft, the width of the embedded groove is gradually increased from bottom to top, and a first notch is formed in the rear part of the rotating part;

a first through hole is formed in the brush head handle and is communicated with the first mounting groove, a transmission rod used for transmitting power of a motor penetrates through the first through hole, the transmission rod is connected with a swinging piece, the swinging piece comprises a block body, a first insertion hole used for being inserted into the front part of the transmission rod is formed in the lower part of the block body, and a first columnar bulge used for extending into the first notch is formed in the upper part of the block body;

a first fixing plate which is longitudinally arranged is arranged below the front part of the brush head handle, a second fixing shaft is arranged in the middle of the first fixing plate, a second rotating shaft hole which is used for penetrating through the second fixing shaft is arranged in the middle of the rear brush plate, the rear brush plate is arranged on the front side of the first fixing plate, a second through hole is arranged at the upper part of the first fixing plate, an upright post penetrates through the second through hole, the upper part of the upright post props against the lower part of the rotating part, and the lower part of the upright post props against the upper part of the rear brush plate;

a torsion spring is arranged between the rear brush plate and the first fixing plate, a first limiting column is arranged on the rear brush plate, a second limiting column is arranged on the first fixing plate, the torsion spring comprises a coil part, a first torsion arm connected with the coil part and a second torsion arm connected with the coil part, the coil part is sleeved on the second fixing shaft, one side part of the first torsion arm props against the first limiting column, and one side part of the second torsion arm props against the second limiting column;

the upper part of the first fixing plate is connected with a second fixing plate which is transversely arranged, the second fixing plate is arranged on the front side of the brush head handle, a first strip-shaped opening is formed between the first fixing plate and the second fixing plate, the upper part of the rear brush plate is provided with a swinging rod, the upper part of the swinging rod penetrates through the first strip-shaped opening, and the swinging rod is provided with a second strip-shaped opening which is longitudinally arranged;

a second mounting groove for mounting the upper brush plate is formed in the second fixing plate, a rotating shaft is arranged in the second mounting groove, mounting holes for inserting the rotating shaft are formed in two side walls of the second mounting groove, a second cylindrical protrusion is arranged on one side portion, close to the oscillating rod, of the rotating shaft, one side portion of the second cylindrical protrusion extends into the second strip-shaped opening, a fixing ring is arranged on the upper portion of the upper brush plate, and the rotating shaft penetrates through the fixing ring;

the upper brush plate is provided with a connecting rod, and the front brush plate is provided with a through hole for the connecting rod to penetrate;

a cover plate is arranged above the second fixing plate, a third fixing plate is arranged on the front side of the cover plate, the upper part of the third fixing plate is connected with the front part of the cover plate, and a sliding groove for mounting the front brush plate is formed in the third fixing plate;

a second notch is formed in the rear part of the cover plate, and a second flaky protrusion used for abutting against the second notch is formed in the front part of the brush head handle;

a spring is provided in the second mounting groove, one side portion of the spring is fixed to the rear portion of the second fixing plate, and the other side portion of the spring is fixed to the front portion of the cover plate.

The cross sections of the front side part and the rear side part of the rotating shaft are circular, the cross section of the middle part of the rotating shaft is rectangular, the middle part of the fixing ring is provided with a third through hole, the cross section of the fixing ring is rectangular, and the middle part of the rotating shaft penetrates through the third through hole.

The protruding transversal personally submitting of second columnar order is circular, the diameter of axis of rotation is greater than the protruding diameter of second columnar order, the central line of axis of rotation with the protruding central line of second columnar order is parallel arrangement.

One side part of the connecting rod is arranged on the left side of the front part of the upper brush plate, the other side part of the connecting rod penetrates into the penetrating hole, and the penetrating hole is arranged on the right side of the upper part of the front brush plate.

The lower surface of the upright post is arc-surface-shaped. The upper side surface of the rear brush plate is arc-surface-shaped.

And a third flaky protrusion extending upwards is arranged on the cover plate close to the second notch.

The upper brush plate is provided with a spring clamping piece for fixedly connecting the spring. The spring is two, and two the spring sets up respectively the both sides of axis of rotation, be equipped with a draw-in groove on the upper brush board, the spring fastener includes an annular body, the annular body cover is established the outside of axis of rotation, the lower part card of annular body is gone into in the draw-in groove, the both sides of annular body all are equipped with a fourth slice arch that is used for stretching into the spring.

The two sides of the first notch are provided with vertical rods which are cylindrical, the front part of the brush head handle is provided with a third strip-shaped opening with a circular arc-shaped cross section, and the upper part of each vertical rod extends into the corresponding third strip-shaped opening.

The brush hair of setting on the lower surface of last brush board is vertical arranging, sets up brush hair on the trailing flank of preceding brush board is the slope and arranges, sets up brush hair on the leading flank of back brush board is the slope and arranges.

When the toothbrush is used, the front face of the toothbrush is placed in an oral cavity, a user pushes the brush head handle along the tooth brushing direction, the brush head handle rotates around the fixed shaft, the second sheet-shaped bulge arranged on the front side of the brush head handle pushes and props the cover plate from the second notch, so that the distance between the front brush plate and the rear brush plate is increased to adapt to the corner of teeth, the brush head handle is continuously pushed, the distance between the front brush plate and the rear brush plate changes along with the thickness of the teeth, the thickness between the door teeth and the molar is self-adaptive, then the front brush plate and the rear brush plate are tensioned through the spring to be attached to the teeth, and the self-adaptive effects of brush head expansion, close attachment and angle free transformation are achieved;

wherein, the transmission rod in the brush head handle transmits the power output by the motor in the electric toothbrush to the swinging part, the transmission rod rotates along with the rotating shaft of the motor and continuously changes the steering, the transmission rod drives the swinging part to move, the columnar bulge on the swinging part pushes the rotating part from the first gap, so that the rotating part rotates around the fixed shaft and continuously changes the steering, the block bulge in the mounting groove on the brush head handle is arranged in the embedded groove of the rotating part, the block bulge moves along the side wall of the embedded groove along with the rotation of the rotating part, and then the rotating part moves up and down, when the rotating part moves down, the column pushes one side of the rear brush plate through the column, so that the rear brush plate deflects around the second fixed shaft in the middle part of the rear brush plate, the first spacing column on the rear brush plate and the second spacing column on the first fixed plate compress the torsion spring, the torsion spring can push the rear brush plate to reset when the rotating part moves up, and then the back brush board can be continuous around the second fixed axle in its middle part and take place left and right deflection, and then the swinging arms on the back brush board takes place left and right swing, because the second columnar protrusion of axis of rotation one side stretches into in the second strip opening on the swinging arms, the swinging arms drives the axis of rotation when swinging takes place to rotate, the axis of rotation drives the brush board through solid fixed ring and moves, and then go up the brush board and can take place left and right deflection around the axis of rotation, go up the brush board and drive the connecting rod that sets up on one side of last brush board when deflecting left and right, the up-and-down motion is done to the connecting rod, the connecting rod plays the effect of pushing down or lifting to the front brush board from the hole that penetrates, the front brush board is driven and is done, the down-and-down motion in the spout, the trilateral brush.

Through the design, the utility model provides a three-sided brush head of the electric toothbrush adopting the torsional spring, and the three-sided brush hair of the brush head is driven by the motor to move, thereby improving the cleaning effect of the teeth; and through the surrounding type effect that trilateral brush hair produced and along with the thickness change of incisor to grinding one's teeth, the self-adaptation effect of the automatic laminating of brush hair satisfies the tooth cleaning demand of the crowd of different oral cavities and tooth sizes, the design of trilateral brush hair has solved the clean problem in the region that the tooth inboard should not be brushed, avoid various bad habits of brushing teeth to produce, the user no longer need initiatively change brush head position and look for clean point, only need promote the brush head and can accomplish the overall process of brushing teeth, simplify the process of brushing teeth, the efficiency of brushing teeth has been improved.

Drawings

FIG. 1 is a schematic view of a part of the structure of the present invention;

fig. 2 is a bottom view of the present invention;

FIG. 3 is an exploded view of the present invention;

fig. 4 is a partial structural view of the rotating member of the present invention;

FIG. 5 is a schematic view of a part of the structure of the brush head handle of the present invention;

FIG. 6 is a partial schematic structural view of the swinging member of the present invention;

fig. 7 is a partial schematic structural view of the first fixing plate of the present invention;

FIG. 8 is a schematic view of a portion of the structure of the rear brush plate of the present invention;

fig. 9 is a schematic view of a partial structure of the rotating shaft of the present invention;

FIG. 10 is a schematic view of a part of the upper brush plate of the present invention;

fig. 11 is a schematic view of a part of the structure of the cover plate of the present invention;

fig. 12 is a partial structural schematic diagram of the front brush plate of the present invention.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1 to 12, a three-sided brush head of an electric toothbrush using a torsion spring comprises a brush head, the brush head comprises a brush head handle 1, a front brush plate 4, a rear brush plate 3, and an upper brush plate 10, wherein the rear side surface of the front brush plate is provided with brush bristles, the front side surface of the rear brush plate is provided with brush bristles, and the lower side surface of the upper brush plate is provided with brush bristles; the front part of the brush head handle is provided with a first mounting groove 25, a first fixed shaft 7 and a rotating part 19 are arranged in the first mounting groove, the middle part of the rotating part is provided with a first rotating shaft hole 21 for penetrating through the first fixed shaft, the front part of the rotating part is provided with an embedded groove 22, one side of the first fixed shaft is provided with a block-shaped bulge 26 matched with the embedded groove, the width of the embedded groove is gradually increased from bottom to top, and the rear part of the rotating part is provided with a first notch 23; a first through hole 11 is formed in the brush head handle and is communicated with the first mounting groove, a transmission rod used for transmitting the power of the motor penetrates through the first through hole, the transmission rod is connected with a swinging piece 9, the swinging piece comprises a block body, a first insertion hole 28 used for being inserted into the front part of the transmission rod is formed in the lower part of the block body, and a first columnar bulge 29 used for extending into the first gap is formed in the upper part of the block body; a first fixing plate 2 which is longitudinally arranged is arranged below the front part of the brush head handle, a second fixing shaft 30 is arranged in the middle of the first fixing plate, a second rotating shaft hole 37 for penetrating the second fixing shaft is arranged in the middle of the rear brush plate, the rear brush plate is arranged on the front side of the first fixing plate, a second through hole 35 is arranged on the upper part of the first fixing plate, an upright post 20 penetrates through the second through hole, the upper part of the upright post props against the lower part of the rotating part, and the lower part of the upright post props against the upper part of the rear brush plate; a torsion spring 15 is arranged between the rear brush plate and the first fixing plate, a first limit column is arranged on the rear brush plate, a second limit column 36 is arranged on the first fixing plate, the torsion spring comprises a coil part, a first torsion arm connected with the coil part and a second torsion arm connected with the coil part, the coil part is sleeved on the second fixing shaft, one side part of the first torsion arm props against the first limit column, and one side part of the second torsion arm props against the second limit column; the upper part of the first fixing plate is connected with a second fixing plate 31 which is transversely arranged, the second fixing plate is arranged at the front side of the brush head handle, a first strip-shaped opening 34 is arranged between the first fixing plate and the second fixing plate, the upper part of the rear brush plate is provided with a swinging rod 39, the upper part of the swinging rod penetrates through the first strip-shaped opening, and the swinging rod is provided with a second strip-shaped opening 38 which is longitudinally arranged; a second mounting groove 33 for mounting the upper brush plate is formed in the second fixing plate, a rotating shaft 14 is arranged in the second mounting groove, mounting holes 32 for inserting the rotating shaft are formed in two side walls of the second mounting groove, a second cylindrical protrusion 40 is arranged on one side portion of the rotating shaft close to the swinging rod, one side portion of the second cylindrical protrusion extends into the second strip-shaped opening, a fixing ring 43 is arranged on the upper portion of the upper brush plate, and the rotating shaft penetrates through the fixing ring; a connecting rod 41 is arranged on the upper brush plate, a penetrating hole 47 for penetrating the connecting rod is arranged on the front brush plate, a cover plate 5 is arranged above the second fixing plate, a third fixing plate 46 is arranged on the front side of the cover plate, the upper part of the third fixing plate is connected with the front part of the cover plate, and a sliding groove 45 for installing the front brush plate is arranged on the third fixing plate; the rear part of the cover plate is provided with a second gap 44, the width of the second gap is gradually increased from front to back, and the front part of the brush head handle is provided with a second flaky bulge 27 for abutting against the second gap; a spring 17 is provided in the second mounting groove, one side portion of the spring is fixed to the rear portion of the second fixing plate, and the other side portion of the spring is fixed to the front portion of the cover plate. Through the design, the utility model provides a three-sided brush head of the electric toothbrush adopting the torsional spring, and the three-sided brush hair of the brush head is driven by the motor to move, thereby improving the cleaning effect of the teeth; and through the surrounding type effect that trilateral brush hair produced and along with the thickness change of incisor to grinding one's teeth, the self-adaptation effect of the automatic laminating of brush hair satisfies the tooth cleaning demand of the crowd of different oral cavities and tooth sizes, the design of trilateral brush hair has solved the clean problem in the region that the tooth inboard should not be brushed, avoid various bad habits of brushing teeth to produce, the user no longer need initiatively change brush head position and look for clean point, only need promote the brush head and can accomplish the overall process of brushing teeth, simplify the process of brushing teeth, the efficiency of brushing teeth has been improved.

When the toothbrush is used, the front face of the toothbrush is placed in an oral cavity, a user pushes the brush head handle along the tooth brushing direction, the brush head handle rotates around the fixed shaft, the second sheet-shaped bulge arranged on the front side of the brush head handle pushes and props the cover plate from the second notch, so that the distance between the front brush plate and the rear brush plate is increased to adapt to the corner of teeth, the brush head handle is continuously pushed, the distance between the front brush plate and the rear brush plate changes along with the thickness of the teeth, the thickness between the door teeth and the molar is self-adaptive, then the front brush plate and the rear brush plate are tensioned through the spring to be attached to the teeth, and the self-adaptive effects of brush head expansion, close attachment and angle free transformation are achieved; wherein, the transmission rod in the brush head handle transmits the power output by the motor in the electric toothbrush to the swinging part, the motor can be set to be in an operation mode of alternate clockwise rotation and anticlockwise rotation, and a rotation angle of the clockwise rotation and the anticlockwise rotation of the motor rotating shaft is set, the transmission rod rotates along with the rotating shaft of the motor and continuously changes the steering, the transmission rod drives the swinging part to move, the columnar bulge on the swinging part pushes the rotating part from the first gap, so that the rotating part rotates around the fixed shaft and continuously changes the steering, the block bulge in the mounting groove on the brush head handle is arranged in the embedded groove of the rotating part, the block bulge moves along the side wall of the embedded groove along the rotating part along with the rotation of the rotating part, and then the rotating part moves up and down, when the rotating part moves down, the rotating part pushes one side of the rear brush plate through the upright post, so that the rear brush plate deflects around the second fixed shaft in the middle part, the torsion spring is compressed by the first limit post on the rear brush plate and the second limit post on the first fixed plate, the torsion spring can push the rear brush plate to reset when the rotating piece moves upwards, and then the rear brush plate can continuously deflect left and right around the second fixed shaft in the middle of the rear brush plate, and then the swinging rod on the rear brush plate swings left and right, because the second column-shaped bulge on one side of the rotating shaft extends into the second strip-shaped opening on the swinging rod, the rotating shaft is driven to rotate when the swinging rod swings, the rotating shaft drives the upper brush plate to move through the fixed ring, and further the upper brush plate can deflect left and right around the rotating shaft, the connecting rod arranged on one side of the upper brush plate is driven to move up and down when the upper brush plate deflects left and right, the connecting rod penetrates through the hole to play a role of pressing down or lifting up the front brush plate, the front brush plate is driven to move up and down in the chute, and three sides of the brush head are driven by the motor, the cleaning effect of the teeth is improved.

In order to ensure the using effect of the brush head, the upper part of the first fixing plate is provided with a fourth rotating shaft hole for penetrating the fixing shaft. The second through hole is one, and the second through hole sets up one side at the second pivot hole.

The second fixing shaft and the third fixing shaft are both provided with a limiting ring 16. The limiting ring on the second fixing shaft is used for limiting the position of the rear brush plate, and the limiting ring of the third fixing shaft is used for limiting the position of the front brush plate.

In order to ensure the effect that the rotating shaft drives the upper brush plate to deflect left and right, the cross sections of the front side part and the rear side part of the rotating shaft are circular, the cross section of the middle part of the rotating shaft is rectangular, the middle part of the fixing ring is provided with a third through hole with the rectangular cross section, and then the middle part of the rotating shaft penetrates through the third through hole. For the convenience of installation, the rotating shaft passes through the third through hole, and the diameter of the front part of the rotating shaft is not larger than the height of the middle part of the rotating shaft.

In order to ensure that the swinging rod drives the rotating shaft to rotate, the cross section of the second cylindrical protrusion is circular, the diameter of the rotating shaft is larger than that of the second cylindrical protrusion, and the central line of the rotating shaft and the central line of the second cylindrical protrusion are arranged in parallel.

In order to guarantee the effect of the up-and-down movement of the front brush plate, one side part of the connecting rod is arranged on the left side of the front part of the upper brush plate, the other side part of the connecting rod penetrates into the penetrating hole, and the penetrating hole is arranged on the right side of the upper part of the front brush plate.

The lower surface of the upright post is arc surface shaped. The upper side surface of the rear brush plate is arc surface-shaped. The deflection of the rear brush plate is smooth, and the using effect of the brush head is ensured.

A third sheet-shaped bulge 6 extending upwards is arranged on the cover plate close to the second gap. The sum of the height of the third sheet-shaped protrusion and the thickness of the cover plate is not less than the sum of the thickness of the second sheet-shaped protrusion and the depth of the embedded groove. The effect that the second flaky bulges at the front side of the brush head handle push and open the cover plate is ensured.

The upper brush plate is provided with a spring fastener 18 for fixedly connecting a spring. The number of the springs is two, the two springs are respectively arranged on two sides of the rotating shaft, a clamping groove 42 is formed in the upper brush plate, the spring clamping piece comprises an annular body, the annular body is sleeved on the outer side of the rotating shaft, the lower portion of the annular body is clamped into the clamping groove, and fourth flaky protrusions used for extending into the springs are arranged on two sides of the annular body. Spring fastener and last brush board fixed connection are passed through at the spring middle part, all receive the pulling force of spring on preceding, the rear direction of going up the brush board, and then when the second slice arch of brush head handle front side promoted and propped open the apron, the position of going up the brush board is comparatively fixed and can be close to the intermediate position department of preceding brush board and back brush board, can play better clean effect to the upper surface of user's molar.

Two sides of the first gap are respectively provided with a vertical rod 24 which is cylindrical, the front part of the brush head handle is provided with a third strip-shaped opening 8 with an arc-shaped cross section, and the upper part of the vertical rod extends into the third strip-shaped opening. This design makes first column arch on the swing piece be located between the pole setting of first breach both sides, and the first column arch on the swing piece of being convenient for promotes from first breach department and rotates the piece, and simultaneously, the upper portion of pole setting stretches into in the third strip opening, and then restricts the rotation range that rotates the piece, has guaranteed the clean effect of toothbrush.

In order to facilitate the transmission of the power of the motor by the transmission rod, a plug inserted into the first insertion hole is arranged at the front part of the transmission rod, and the height of the plug is larger than the width of the plug. The transmission rod comprises a first transmission rod 12 and a second transmission rod 13, the first transmission rod is connected with the second transmission rod, a second insertion hole for inserting a motor rotating shaft is formed in the rear portion of the first transmission rod, the cross section of the front portion of the first transmission rod is semicircular, a third insertion hole matched with the front portion of the first transmission rod in shape is formed in the rear portion of the second transmission rod, and the plug is arranged in the front portion of the second transmission rod.

In order to facilitate the installation, the front part of the brush head handle is provided with a fourth insertion hole, and the fixing shaft penetrates into the installation groove from the fourth insertion hole.

The block-shaped bulge and the brush head handle adopt an integrated structure. The rear brush plate and the swinging rod adopt an integrated structure. The upper brush plate and the connecting rod adopt an integrated structure. So as to ensure the structural strength of the brush head and the using effect of the brush head.

In order to guarantee the cleaning effect, the bristles arranged on the lower surface of the upper brush plate are vertically arranged, the bristles arranged on the rear side surface of the front brush plate are obliquely arranged, and the bristles arranged on the front side surface of the rear brush plate are obliquely arranged.

While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims (10)

1. A three-sided brush head of an electric toothbrush adopting a torsional spring comprises a brush head and is characterized in that the brush head comprises a brush head handle, a front brush plate, a rear brush plate and an upper brush plate, wherein brush hair is arranged on the rear side surface of the front brush plate, brush hair is arranged on the front side surface of the rear brush plate, and brush hair is arranged on the lower side surface of the upper brush plate;

the front part of the brush head handle is provided with a first mounting groove, a first fixed shaft and a rotating part are arranged in the first mounting groove, a first rotating shaft hole for penetrating through the first fixed shaft is formed in the middle of the rotating part, an embedded groove is formed in the front part of the rotating part, a block-shaped bulge matched with the embedded groove is formed in one side of the first fixed shaft, the width of the embedded groove is gradually increased from bottom to top, and a first notch is formed in the rear part of the rotating part;

a first through hole is formed in the brush head handle and is communicated with the first mounting groove, a transmission rod used for transmitting power of a motor penetrates through the first through hole, the transmission rod is connected with a swinging piece, the swinging piece comprises a block body, a first insertion hole used for being inserted into the front part of the transmission rod is formed in the lower part of the block body, and a first columnar bulge used for extending into the first notch is formed in the upper part of the block body;

a first fixing plate which is longitudinally arranged is arranged below the front part of the brush head handle, a second fixing shaft is arranged in the middle of the first fixing plate, a second rotating shaft hole which is used for penetrating through the second fixing shaft is arranged in the middle of the rear brush plate, the rear brush plate is arranged on the front side of the first fixing plate, a second through hole is arranged at the upper part of the first fixing plate, an upright post penetrates through the second through hole, the upper part of the upright post props against the lower part of the rotating part, and the lower part of the upright post props against the upper part of the rear brush plate;

a torsion spring is arranged between the rear brush plate and the first fixing plate, a first limiting column is arranged on the rear brush plate, a second limiting column is arranged on the first fixing plate, the torsion spring comprises a coil part, a first torsion arm connected with the coil part and a second torsion arm connected with the coil part, the coil part is sleeved on the second fixing shaft, one side part of the first torsion arm props against the first limiting column, and one side part of the second torsion arm props against the second limiting column;

the upper part of the first fixing plate is connected with a second fixing plate which is transversely arranged, the second fixing plate is arranged on the front side of the brush head handle, a first strip-shaped opening is formed between the first fixing plate and the second fixing plate, the upper part of the rear brush plate is provided with a swinging rod, the upper part of the swinging rod penetrates through the first strip-shaped opening, and the swinging rod is provided with a second strip-shaped opening which is longitudinally arranged;

a second mounting groove for mounting the upper brush plate is formed in the second fixing plate, a rotating shaft is arranged in the second mounting groove, mounting holes for inserting the rotating shaft are formed in two side walls of the second mounting groove, a second cylindrical protrusion is arranged on one side portion, close to the oscillating rod, of the rotating shaft, one side portion of the second cylindrical protrusion extends into the second strip-shaped opening, a fixing ring is arranged on the upper portion of the upper brush plate, and the rotating shaft penetrates through the fixing ring;

the upper brush plate is provided with a connecting rod, and the front brush plate is provided with a through hole for the connecting rod to penetrate;

a cover plate is arranged above the second fixing plate, a third fixing plate is arranged on the front side of the cover plate, the upper part of the third fixing plate is connected with the front part of the cover plate, and a sliding groove for mounting the front brush plate is formed in the third fixing plate;

a second notch is formed in the rear part of the cover plate, and a second flaky protrusion used for abutting against the second notch is formed in the front part of the brush head handle;

a spring is provided in the second mounting groove, one side portion of the spring is fixed to the rear portion of the second fixing plate, and the other side portion of the spring is fixed to the front portion of the cover plate.

2. The electric toothbrush three-sided brush head adopting the torsion spring as claimed in claim 1, wherein the front and rear sides of the rotation shaft have a circular cross-section, the middle of the rotation shaft has a rectangular cross-section, the middle of the fixing ring has a third through hole with a rectangular cross-section, and the middle of the rotation shaft passes through the third through hole; the diameter of the front portion of the rotating shaft is not greater than the height of the middle portion of the rotating shaft.

3. The electric toothbrush three-sided brush head adopting the torsion spring as claimed in claim 1, wherein the second cylindrical protrusion has a circular cross section, the diameter of the rotation shaft is greater than that of the second cylindrical protrusion, and the center line of the rotation shaft is parallel to that of the second cylindrical protrusion.

4. The electric toothbrush three-sided brush head using a torsion spring according to claim 1, wherein one side portion of the connecting rod is disposed at a left side of a front portion of the upper brush plate, and the other side portion of the connecting rod penetrates into the penetration hole disposed at a right side of an upper portion of the front brush plate.

5. The electric toothbrush three-sided brush head adopting the torsion spring as claimed in claim 1, wherein the lower surface of the pillar is arc-shaped; the upper side surface of the rear brush plate is arc-surface-shaped.

6. A three-sided brush head for an electric toothbrush using a torsion spring according to claim 1, wherein a third plate-like projection extending upward is provided on the cover plate near the second notch.

7. The electric toothbrush three-sided brush head adopting the torsion spring as claimed in claim 1, wherein the upper brush plate is provided with a spring clip for fixedly connecting the spring.

8. The electric toothbrush three-sided brush head adopting the torsion spring as claimed in claim 7, wherein the number of the springs is two, the two springs are respectively disposed at both sides of the rotation shaft, the upper brush plate is provided with a slot, the spring fastener comprises an annular body, the annular body is sleeved at the outside of the rotation shaft, the lower portion of the annular body is clamped into the slot, and both sides of the annular body are provided with fourth plate-shaped protrusions for extending into the springs.

9. The electric toothbrush three-sided brush head using the torsion spring as claimed in claim 1, wherein the first notch is provided with a vertical rod at both sides, the vertical rod is cylindrical, the front portion of the brush head handle is provided with a third opening having an arc-shaped cross section, and the upper portion of the vertical rod extends into the third opening.

10. The electric toothbrush three-sided brush head using the torsion spring according to claim 1, wherein the bristles disposed on the lower surface of the upper brush plate are arranged vertically, the bristles disposed on the rear side surface of the front brush plate are arranged obliquely, and the bristles disposed on the front side surface of the rear brush plate are arranged obliquely.

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