KR102345580B1 - Electric toothbrush - Google Patents

Abstract

An electric toothbrush according to the present invention comprises: a handle; a driving motor installed inside the handle and rotating a rotating shaft protruding in front of the handle in a forward and backward direction along the length of the handle to reciprocate forward and reverse within a predetermined angle range; Front and rear bristle units arranged in a line at the front end of the rotation shaft to reciprocate forward and backward in the forward and backward directions together with the rotation shaft, respectively, in which bristles are implanted; The line and rear bristle units are arranged in a line between the units, and are bound to the rotation shaft so as to be able to rotate forward and reverse in a vertical direction that is perpendicular to the rotation axis as an axis, and include a central bristle unit in which bristles are implanted. As described above, if the electric toothbrush according to the present invention is used, there is an advantage that the complex movement of the bristles for correct brushing can be implemented simply.

Description

Electric toothbrush

The present invention relates to an electric toothbrush powered by an electric motor.

In general, when an electric toothbrush is driven by supplying electricity to a motor built in a handle, the bristle unit coupled to the rotation shaft of the motor automatically moves.

Republic of Korea Patent Publication No. 10-0931012 (registration date; December 02, 2009) discloses 'an electric toothbrush capable of a compound movement of forward and backward movement and left and right vibration'. Looking at this prior patent, as an electric toothbrush consisting of a toothbrush rest 10 and a brush unit 20 that is detachably installed on the toothbrush rest 10, the toothbrush rest 10 converts the rotation of the drive shaft into a forward and backward motion to convert the brush unit ( 20), and the second operation unit 200 that converts the rotation of the drive shaft into left-right motion and transmits it to the brush unit 20, so that the brush performs forward and backward motion and A technique for performing a compound motion of left and right vibrations is disclosed.

However, the electric toothbrush according to the prior art has problems in that the structure is complicated, the size is large and heavy, and the unit price is high because each independent movement mechanism must be provided in order to implement the compound movement of the brush, that is, bristles. In addition, there are many difficulties in implementing the complex motion of the bristles as described above, so there is a problem in that there is a limit in realizing the motion of the bristles for correct brushing.

Republic of Korea Patent Publication No. 10-0931012 (Registration date; December 02, 2009)

The present invention has been devised to solve the above problems, and an object of the present invention is to provide an electric toothbrush capable of simply implementing the compound motion of bristles for correct brushing with one rotation axis.

An electric toothbrush according to the present invention for realizing the above object, the handle; a driving motor installed inside the handle and rotating a rotating shaft protruding in front of the handle in a forward and backward direction along the length of the handle to reciprocate forward and reverse within a predetermined angle range; Front and rear bristle units arranged in a line at the front end of the rotation shaft to reciprocate forward and backward in the forward and backward directions together with the rotation shaft, respectively, in which bristles are implanted; The line and rear bristle units are arranged in a line between the units, and are bound to the rotation shaft so as to be able to rotate forward and reverse in a vertical direction that is perpendicular to the rotation axis as an axis, and include a central bristle unit in which bristles are implanted.

Further comprising a head body coupled to the front end of the handle in the front and rear direction, the head body is inserted through the rotation shaft, the rear bristle unit and the central bristle unit is formed an internal space is built, the bottom surface tip On the side, the central bristle unit is positioned so as to reciprocate forward and backward, and a first opening hole through which the bristles of the central bristle unit are exposed outside the head body is formed, and the rear bristle unit is capable of forward and reverse reciprocating movement on the rear end of its bottom surface. a second opening hole positioned so as to expose the bristles of the rear bristle unit to the outside of the head body is formed, and a tip opening hole is formed at the tip end thereof so that the rotation shaft can protrude toward the front of the head body; The front bristle unit includes a head cap having bristles implanted therein, and the head cap is positioned in front of the head body to form a head shape in combination with the head body to cover the tip opening hole of the head body and the inside The rotating shaft may be integrally inserted so as to reciprocate forward and backward.

The rear bristle unit is located in the second opening hole of the head body and includes a bristle implanted plate, wherein the bristle plate is a curved curvature along the left and right width directions in response to the forward and reverse reciprocating motion of the rear bristle unit. It is formed of a curved surface consisting of; The second opening hole of the head body may be formed in a curved surface to correspond to the implantation plate made of the left and right both sides of the curved surface, respectively.

The rear bristle unit is located in the second opening hole of the head body, the bristles are implanted, and the left and right width corresponding to the forward and reverse reciprocating motion of the rear bristle unit is formed in a rectangle smaller than the second opening hole of the head body. ; It may include a sealing cover that covers the gap between the implantation plate and the second opening hole of the head body and is elastically deformed in response to the forward and reverse reciprocating motion of the rear bristle unit.

The central bristle unit is installed at regular intervals in the vertical direction below the rotation shaft, and is installed between the circular plate having the bristles on its outer surface, and the circular plate and the rotation shaft to change the direction of the forward and reverse reciprocating rotational force of the rotation shaft. Includes a rotational force conversion unit to transmit to the disk; The rotational force conversion unit includes an eccentric cam coupled to one side to rotate integrally forward and reverse to the rotation shaft, and an eccentric cam formed to protrude upward and downward toward the rotation shaft on the inner surface of the disc, and is bound to the forward and reverse reciprocating rotation of the eccentric cam, after the eccentric shaft is front and back It may include a locking protrusion formed with a fitting portion into which the other side of the eccentric cam eccentric from the rotation shaft is fitted so as to be movable relative to the vertical and horizontal directions.

The electric toothbrush according to the present invention can implement correct brushing because it can simultaneously independently implement left and right forward and reverse reciprocating motion and vertical reciprocating motion by one rotating shaft, and the overall structure for this purpose is simple, compact, and light, so the feeling of use is good . In addition, the present invention can improve brushing more efficiently because the front bristle unit, which enters relatively deeper into the mouth when brushing teeth, is implemented independently from the head body and can be dynamically driven.

1 is a perspective view illustrating a part of a forward motion state of an electric toothbrush according to a first embodiment of the present invention.
FIG. 2 is a perspective view illustrating a reverse movement state of the electric toothbrush shown in FIG. 1 .
FIG. 3 is a bottom view of the powered toothbrush shown in FIG. 1 ;
FIG. 4 is a side view of the powered toothbrush shown in FIG. 1 ;
5 is a front cross-sectional view taken along line '' shown in FIG.
6 is a front cross-sectional view taken along line '' shown in FIG.
7 is a side cross-sectional view of the rear bristle unit in the electric toothbrush according to the second embodiment of the present invention.
8 is a side cross-sectional view of the rear bristle unit in the electric toothbrush according to the third embodiment of the present invention.
9 is a side view corresponding to FIG. 4 as an electric toothbrush according to a fourth embodiment of the present invention.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 6 , the electric toothbrush according to the first embodiment of the present invention includes a handle 2 , a driving motor (not shown), and a head 6 .

The handle 2 may be formed in a long shape in one direction, that is, in the front-rear direction. An inner space in which a driving motor, etc. is installed is formed inside the handle 2, and the inner space of the handle 2 is a front-end opening opened in the front-rear direction so as to communicate with the head 6 at the front end of the head 6 side. A hole is formed. A switch capable of operating the driving motor is installed on one side of the handle 2 .

The driving motor is installed on one side of the inner space of the handle (2). The drive motor rotates the rotation shaft 4 forward and reverse reciprocally within a predetermined angle, preferably within a range of 40 degrees to 45 degrees. The rotation shaft 4 of the drive motor may be installed long along the front-rear direction so that it can be rotated about the longitudinal direction of the handle 2 , that is, the front-rear direction as an axis. In particular, the rotating shaft 4 of the drive motor protrudes toward the front of the handle 2 through the opening hole at the tip of the handle 2 so that it can be inserted into the head 6 .

The head 6 is coupled to the tip of the handle 2 along the front-rear direction, and bristles are implanted. The head 6 implements the compound motion of the bristles, and in particular, as described later, may be of a relatively long shape in the front and back directions in response to the complex motion of the bristles along the front and back directions. The shape of the bottom surface of the head 6, that is, the surface on which the bristles are implanted, can be divided into a line and a rear portion along the front-to-back direction, and the front portion of the head 6 has a curved line of a certain curvature, and the width toward the tip of the head 6 is increased. This may be a narrow form, and the rear portion of the head 6 may be of a form in which the width becomes narrower toward the rear end of the head 6 in a substantially straight line. The leading end of the head 6 may be longer than the rear of the head 6 . This head 6 includes a head body 10 , a front bristle unit 20 , a central bristle unit 30 , and a rear bristle unit 40 . In particular, the front bristle unit 20, the central bristle unit 30, and the rear bristle unit 40 of the head 6 are arranged in a line along the front-rear direction.

The head body 10 is directly and fixedly coupled to the tip of the handle 2 along the front-rear direction, and thus the front-end opening hole of the handle 2 is sealed. The head body 10 may have a shape that forms the remaining portion of the head 6 by cutting the head cap 22 to be described later in the front-rear direction among the overall shape of the head 6 . The head body 10 has an internal space in which the rotation shaft 4 of the driving motor is inserted and penetrated, and the rear bristle unit 40 and the central bristle unit 30 are built-in.

The rear end surface of the head body 10 may be flat to correspond to the front end surface of the handle 2 so as to be closely coupled to the front end surface of the handle 2 . A rear end opening hole is formed in the rear end surface of the head body 10 so that the rotating shaft 4 of the driving motor can be inserted thereinto.

The front end surface of the head body 10 may be flat so as not to interfere with the forward and reverse reciprocating motion of the front bristle unit 20 as will be described later. A front end opening hole may be formed in the front end surface of the head body 10 so that the front end of the rotating shaft 4 of the driving motor can protrude toward the front of the head body 10 .

A first opening hole 12 opened in the vertical direction is formed at the front end of the bottom surface of the head body 10 . In the first opening hole 12 of the head body 10, the central bristle unit 30 is positioned so as to be able to rotate forward and backward with respect to the vertical direction as an axis, and the bristles 31 of the central bristle unit 30 are located in the head body ( 10) may be exposed outside the head body 10 through the first opening 12. The first opening 12 of the head body 10 is formed to correspond to the shape of the central bristle unit 30, and may preferably be circular.

A second opening hole 14 opened in the vertical direction is formed at the rear end of the bottom surface of the head body 10 . In the second opening hole 14 of the head body 10, the rear bristle unit 40 is positioned so that forward and reverse reciprocating motion is possible with the front and rear directions as an axis, and the bristles 41 of the rear bristle unit 40 are attached to the head body 10 ) may be exposed outside the head body 10 through the second opening hole 14 .

The second opening hole 14 of the head body 10 can be formed in a long shape along the left and right width directions in response to the rear bristles unit 40 moving forward and backward along the left and right width directions with the front and rear directions as an axis. have.

The front bristle unit 20 is arranged in the frontmost direction along the front and rear direction, and the longitudinal direction of the rotation shaft 4 together with the rotation shaft 4 of the drive motor, that is, the front and rear direction as an axis, to move forward and backward along the left and right width directions. . In particular, the front bristle unit 20 is a part that goes relatively deeper into the inside of the mouth when brushing, and has an independent structure separated from the head body 10 so that it can be driven more dynamically for efficient brushing.

That is, the front bristle unit 20 includes a head cap 22 in which the bristles 21 are implanted. The head cap 22 is arranged at the front end of the head body 10 to cover the front end opening hole of the head body 10 , and forms the shape of the above-described head 6 together with the head body 10 . Preferably, the bottom surface of the head cap 22 may have a semicircular convex shape toward the front of the head 6 along the front and rear direction so as to be able to enter the corner of the mouth. The head cap 22 has an internal space so that the rotation shaft 4 of the driving motor can be inserted, and the rear end face thereof is relatively uninterrupted with respect to the head body 10 so that the left and right reciprocating motions are not interfered with the head body 10 It is planar corresponding to the front end surface of , and the rear end opening hole opened in the front and rear direction may be formed on the rear end surface. The bristles 21 exposed to the outside are implanted on the bottom surface of the head cap 22 .

The front bristle unit 20 has the head cap 22 connected to the rotation shaft 4 of the drive motor by a coupling element so that the head cap 22 can reciprocate in the left and right width directions with the rotation shaft 4 of the drive motor as the axis. can be integrally coupled to For example, a screw thread may be formed at the tip of the rotation shaft 4 of the driving motor inserted into the head cap 22 , and a nut may be fastened to the tip of the rotation shaft 4 of the driving motor inside the head cap 22 .

The central bristle unit 30 is arranged in a line between the front and rear bristle units 20 and 40 along the front and rear directions, and rotates forward and backward with respect to the vertical direction, that is, the vertical direction with respect to the rotation axis 4 .

The central bristle unit 30 includes a disk 32 and rotational force conversion units 34 and 36 .

The disk 32 is formed to fit the first opening 12 of the head body 10 and is positioned so as to be reciprocally rotatable from the rotation shaft 4 in the vertical direction of the rotation shaft 4 to the bottom of the head body 10 . It is installed at regular intervals toward the surface. The bristles 31 are implanted on the outer surface exposed to the outside of the disk 32 .

The rotational force conversion units 34 and 36 bind the central bristle unit 30 to the rotation shaft 4 so that the central bristle unit 30 can be rotated forward and reverse by the rotation shaft 4 . That is, the rotational force conversion units 34 and 36 are installed between the disk 32 and the rotation shaft 4 to convert the forward and reverse reciprocating rotational force of the rotation shaft 4 that rotates in the front and rear direction to the shaft, and transmits it to the disk 32 and transmits it to the disk (32) makes the axis rotate in the vertical direction.

These rotational force conversion units 34 and 36 may be implemented with various mechanisms for rotational force conversion. Preferably, the rotational force conversion parts 34 and 36 are made of an eccentric cam 34 and a locking protrusion 36 and can be densely and simply implemented in the free space between the disk 32 and the rotating shaft 4 .

The eccentric cam 34 may be formed in a shape that is long in one direction, and becomes narrower toward the end in one direction. One longitudinal side of the eccentric cam 34, particularly a relatively wide part, is formed with a shaft hole 34a so as to be fitted on the outside of the rotating shaft 4 in the front-rear direction. The eccentric cam 34 is bound to the rotation shaft 4 by force fitting or welding, and can be rotated forward and reverse along the left and right width directions. The other long side (34b) of the eccentric cam (34) eccentric from the rotation shaft (4) is engaged with the locking jaw (36) so as to be hooked.

The locking jaw 36 is linked to the forward and reverse rotation of the eccentric cam 34 in the left and right width directions so that the disk 32 can be rotated forward and reverse in the vertical direction as the axis in the vertical direction. ) is associated with These locking projections 36 are formed to protrude in the vertical direction on the inner surface of the disk 32 . As the eccentric cam 34 rotates forward and backward along the left and right width directions, the other long side 34b of the eccentric cam 34 reciprocates within a certain range in the vertical and front-rear directions relative to the locking jaw 36. As it moves, the locking jaw 36 is bound to the left and right movement of the eccentric cam 34, and the eccentric cam 34 is relatively movable in the vertical direction and the front and rear directions of the other long side 34b of the eccentric cam 34. ) is formed with a fitting portion (36a) into which the other long side (34b) is fitted. The fitting portion 36a of the locking jaw 36 is formed by dividing the locking jaw 36 into two left and right sides around the other long side 34b of the eccentric cam 34, or the eccentric cam 34 in the middle of the locking jaw 36. ) of the other longitudinal side (34b) may be formed as a groove that can be fitted in the front-rear direction and the vertical direction.

Meanwhile, the central bristle unit 30 may further include a support pin 37 for rotatably coupling the disk 32 to the head body 10 . The support pin 37 is located between the rotation shaft 4 and the disk 32 in the vertical direction, and may be installed in a vertical direction along the radial direction of the disk 32 with respect to the rotation shaft 4, that is, long in the left and right directions. . Both left and right ends of the support pin 37 may be fixed to the side surface of the head body 10 , respectively. In addition, the support plate 37 passes through the through hole 36b formed in the locking protrusion 36 and spans the locking step 36 , thereby supporting the disc 32 so as not to fall out from the head body 10 . The through hole 36b of the locking protrusion 36 is elongated along the rotation path of the disk 32 so that the disk 32 can rotate relative to the support pin 36 .

The rear bristles unit 40 is arranged at the rearmost side along the front and rear direction, and reciprocates forward and backward along the left and right width directions along the front and rear direction together with the rotation shaft 4 of the drive motor.

The rear bristle unit 40 may include a bristle plate 42 and a holder 44 .

The bristle plate 42 is located at the center of the forward and reverse reciprocating motion path of the rear bristle unit 40, that is, when the bristles 41 are vertically disposed in the second opening hole 14 of the head body 10. Correspondingly, it may be a shape that can be covered. For example, as shown, the tufting plate 42 may have a substantially long rectangular shape from side to side. The bristles 41 are implanted on the outer surface of the hair implantation plate 42 .

The holder 44 is integrally coupled to the rotation shaft 4 of the drive motor and supports the transplantation plate 42 to bind the transplantation plate 42 to the rotation shaft 4 of the drive motor. The holder 44 may have an upper portion fitted to the outside of the rotation shaft 4 , and a lower portion thereof may be coupled to the inner surface of the implantation plate 42 . The holder 44 may be integrally coupled to the rotation shaft 4 by force fitting or welding to the rotation shaft 4 . The holder 44 may be integrally formed with the implantation plate 42 or may be integrally coupled to the implantation plate 42 by welding or the like.

When explaining in detail the effects of the electric toothbrush according to an embodiment of the present invention configured as described above, as follows.

When the driving motor is driven, the rotation shaft 4 of the driving motor rotates forward and backward reciprocally with respect to the front and rear axes.

Accordingly, the front bristle unit 20 and the rear bristle unit 40 are integrally with the rotation shaft 4 of the driving motor and reciprocate forward and backward along the left and right width directions with the front and rear direction as an axis. The bristles 21 of the front bristle unit 20 and the bristles 41 of the rear bristle unit 40 are brushed by the movement of the front bristle unit 20 and the rear bristle unit 40 . In particular, brushing by the front bristle unit 20 and the rear bristle unit 40 is effective in wiping the interdental space on both sides of the teeth.

In addition, the central bristle unit 30 receives rotational force from the rotation shaft 4 through the rotational force conversion units 34 and 36 and rotates forward and reverse in the vertical direction as an axis, and thus the bristles 31 brush the teeth. Brushing by the central bristle unit 30 is particularly effective for cleaning the side surfaces of the teeth.

In this way, brushing by the left and right forward and reverse reciprocating translation motions and brushing by the up and down forward and backward reciprocating rotational motions are simultaneously implemented in a complex manner, so that the teeth are wiped by the rotation and translation motions as a whole, and in particular, the interdental space is also thoroughly cleaned, so that correct brushing can be achieved.

Hereinafter, the electric toothbrush according to the second embodiment of the present invention will be described in detail as shown in FIG. 7 .

The electric toothbrush according to the second embodiment of the present invention can be implemented in the same manner as the first embodiment of the present invention described above, except for the bristle plate 142 of the rear bristle unit 140, the overlapping description will be omitted. do.

The bristle plate 142 of the rear bristle unit 140 is convex from the inside to the outside of the head body 110, and is curved along the left and right width direction in response to the forward and reverse reciprocating rotation path of the rear bristle unit 140. It is formed by a curved surface consisting of The bristle plate 142 is the first opening hole 112 of the head body 110 to always cover the first opening hole 112 of the head body 110 even when the rear bristle unit 140 rotates forward and backward. It may be formed longer than the left and right width. The length of the front and rear direction of the implantation plate 142 is formed shorter than the left and right width of the implantation plate 142 .

In addition, the first opening hole 112 of the head body 110 is formed in a curved surface corresponding to the implantation plate 142 made of the left and right both sides, respectively, the curved surface. The first opening hole 112 of the head body 110 has a length in the front and rear direction corresponding to the length in the front and rear direction of the tuft plate 142 .

Hereinafter, an electric toothbrush according to a third embodiment of the present invention will be described in detail as shown in FIG. 8 .

The electric toothbrush according to the second embodiment of the present invention can be implemented in the same manner as in the first embodiment of the present invention, except for the rear bristle unit 240, a bar overlapping description will be omitted.

The rear bristle unit 240 includes a bristle plate 242 , a holder 244 and a sealing cover 246 .

The implantation plate 242 has a quadrangular shape, and the length in the front and rear direction is the same as the length in the front and rear direction of the second opening hole 214 of the head body 210, so as not to interfere with the head body 210 during forward and reverse reciprocating rotation. The width of the second opening 214 of the 210 is shorter than the left and right widths.

The sealing cover 246 covers the space between the bristle plate 242 and the second opening hole 214 of the head body 210, but is made of a material that can elastically deform in response to the forward and reverse reciprocating rotation of the rear bristle unit 240. is done As an example, the sealing cover 246 may be formed of a pair installed symmetrically left and right with respect to the implantation plate 242 . Each sealing cover 246 is formed in a curved surface curved with a curvature corresponding to the forward and reverse reciprocating motion of the rear bristle unit 240, one end is bound to the bristle plate 242, and the other end is on the head body 210. can be bound Each sealing cover 246 may have a bellows structure to facilitate elastic deformation in the left and right directions.

Meanwhile, on the inner surface of the head body 210 , a support piece 216 to which the sealing cover 246 is bound may be protruded upward and downward toward the inside of the head body 210 . The support piece 216 includes a curved portion 216a formed of a curved surface corresponding to the sealing cover 246 formed of a curved surface, and a second opening hole 214 of the head body 210 in the left and right direction from the upper end of the curved portion 216a. ) may be formed of a binding portion 216b bent toward and bound to the sealing cover 246 .

Hereinafter, an electric toothbrush according to a fourth embodiment of the present invention will be described in detail as shown in FIG. 9 .

The electric toothbrush according to the fourth embodiment of the present invention includes a handle 302 , a driving motor (not shown), and a head 306 .

The head 306 includes a head body 310 , a front bristle unit 320 , a central bristle unit 330 , and a rear bristle unit 340 .

The head body 310 includes a head case 312 and a head cover 314 .

In the head case 312, the rotation shaft 304 of the driving motor is inserted, and the above-mentioned line and rear bristle units 320 and 340 and the central bristle unit 330 are built-in, and an internal space with an open bottom surface is formed. A bearing (not shown) for supporting the rotation shaft 304 may be installed in the inner space of the head case 312 so that the rotation shaft 304 can freely rotate relative to the head case 312 . The head case 312 may be integrally coupled or integrally formed with the handle 302 .

The head cover 314 is coupled to the head case 312 so as to cover the open bottom surface of the head case 312 . The head cover 314 has first, second, and third opening holes 314a, 314b, and 314c that are opened vertically in a line along the front-rear direction. In the first opening hole 314a of the head cover 314, the bristles 321 of the front bristle unit 320 are positioned so as to be able to reciprocate forward and backward with respect to the front-rear direction as an axis. In the second opening hole 314b of the head cover 314, the bristles 331 of the central bristle unit 330 are positioned so as to be able to rotate forward and backward with respect to the vertical direction as an axis. In the third opening hole 314c of the head cover 314, the bristles 341 of the rear bristle unit 340 are positioned so as to be able to reciprocate forward and backward with respect to the front-rear direction as an axis.

The front and rear bristle units 320 and 340 may be made the same as the rear bristle unit of the first embodiment of the present invention described above.

The central bristle unit 330 is also approximately the same as the central bristle unit of the first embodiment of the present invention described above with a circular plate (not shown), an eccentric cam 334, a locking jaw 336, and a support pin 337. However, the eccentric cam 334 is composed of a cam portion (334a) and a pin portion (334b).

The cam portion 334a of the eccentric cam 334 is coupled to rotate integrally with the rotation shaft 304 . The cam portion 334a of the eccentric cam 334 is spaced a predetermined distance from the locking jaw 336 in the front-rear direction to the rear side.

The pin portion 334b of the eccentric cam 334 is eccentric with respect to the rotation shaft 304 and protrudes from the cam portion 334a toward the locking projection 336 in the front-rear direction, and is fitted into the fitting portion of the locking projection 336 .

When explaining the effects of the electric toothbrush according to the fourth embodiment of the present invention configured as described above in detail, as follows.

When the rotation shaft 304 of the drive motor rotates forward and backward in the forward and backward directions as an axis, the front and rear bristle units 320 and 340 integrally move forward and reverse in the forward and backward directions as an axis, and the central bristle unit 330 rotates in the vertical direction as an axis rotates forward and reverse. At this time, when the eccentric cam 334 is rotated together with the rotating shaft 304, the pin portion 334b of the eccentric cam 334 moves forward and backward in the forward and backward directions as an axis while pushing the engaging jaw 336 to move the disc (not shown) up and down. Rotate forward and reverse reciprocally around the axis.

2; handle 4; axis of rotation
6; head 10; head body
12; first opening hole 14; 2nd opening hole
20; front bristle unit 22; head cap
30; central bristle unit 32; negative
34; eccentric cam 36; stumbling block
40; rear bristle unit 42; bed plate
44; holder

Claims (5)

delete with handle;
a driving motor installed inside the handle and rotating a rotating shaft protruding in front of the handle in a forward and backward direction along the length of the handle to reciprocate forward and reverse within a predetermined angle range;
Front and rear bristle units arranged in a line at the front end of the rotation shaft to reciprocate forward and backward in the forward and backward directions together with the rotation shaft, respectively, in which bristles are implanted;
The line and rear bristle units are arranged in a line between the unit, and are coupled to the rotation shaft to allow forward and reverse reciprocating rotation about the vertical direction that is perpendicular to the rotation axis, and a central bristle unit in which bristles are implanted;
Includes; a head body coupled to the front end of the handle in the front and rear direction;
the head body
The rotation shaft is inserted and penetrated to form an internal space in which the rear bristle unit and the central bristle unit are built,
The central bristle unit is positioned so as to be able to rotate forward and backward reciprocally on the tip side of the bottom surface, and a first opening hole is formed through which the bristles of the central bristle unit are exposed outside the head body,
A second opening hole is formed at the rear end of the bottom surface of the rear bristle unit so that the rear bristle unit is positioned so as to reciprocate forward and backward, and the bristles of the rear bristle unit are exposed outside the head body,
a front end opening hole is formed at the front end so that the rotating shaft can protrude in front of the head body;
The front bristle unit includes a head cap having bristles implanted, and the head cap is positioned in front of the head body to form a head shape in combination with the head body to cover the tip opening hole of the head body, and the inside An electric toothbrush, characterized in that the rotating shaft is inserted so as to integrally move forward and reverse. 3. The method of claim 2,
The rear bristle unit is located in the second opening hole of the head body and includes a bristle-implanted bristle plate,
The bristle plate is formed in a curved surface consisting of a curvature curved along the left and right width direction in response to the forward and reverse reciprocating motion of the rear bristle unit;
The second opening hole of the head body is an electric toothbrush, characterized in that the left and right both sides of the electric toothbrush, characterized in that formed in a curved surface corresponding to the implantation plate made of a curved surface, respectively. 3. The method of claim 2,
The rear bristles unit is
a bristle implantation plate positioned in the second opening hole of the head body to implant bristles, the left and right width corresponding to the forward and reverse reciprocating motion of the rear bristle unit is formed in a rectangle smaller than the second opening hole of the head body;
and a sealing cover that covers the gap between the bristle plate and the second opening hole of the head body and is elastically deformed in response to the forward and reverse reciprocating motion of the rear bristle unit. 3. The method of claim 2,
The central bristles unit is
A circular plate installed at regular intervals in the vertical direction below the rotation shaft and having the bristles on its outer surface, and installed between the circular plate and the rotation shaft to change the direction of the forward and reverse reciprocating rotational force of the rotation shaft to transfer the rotational force to the circular plate includes a transition;
The rotational force conversion unit
An eccentric cam coupled so that one side rotates integrally with the rotation shaft in a forward and reverse direction;
The other side of the eccentric cam eccentric from the rotation shaft is fitted on the inner surface of the disk to protrude upward and downward toward the rotation shaft and is bound to the forward and reverse reciprocating rotation of the eccentric cam so that the eccentric shaft can move relative to the front and rear directions and up and down directions An electric toothbrush comprising a locking jaw formed with a fitting portion.

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