CN210384097U

CN210384097U - Brush head subassembly and electric toothbrush

Info

Publication number: CN210384097U
Application number: CN201920326736.6U
Authority: CN
Inventors: 胡斐凡; 胡建坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-14
Filing date: 2019-03-14
Publication date: 2020-04-24
Anticipated expiration: 2029-03-14

Abstract

The utility model provides a brush head subassembly and electric toothbrush for overcoming the problem that there is the defect in the interface mode of brush head subassembly and drive shaft among the prior art. The utility model provides a brush head component, which comprises a brush head body, a connecting component and a locking core; the utility model discloses a brush head assembly, it sets up component assembly chamber at the end of brush head body to install connection component and embedding at component assembly intracavity and all make the most stroke of drive shaft insertion in-process all very smooth and easy convenience including the deformable locking core of the force application portion that fulcrum atress portion and both ends exerted elasticity, only just produce pressure locking drive shaft when two last force application portions all contact with the drive shaft, and the locking that this kind of elasticity produced can keep for a long time. Ensuring the torque transmission and axial holding capacity thereof.

Description

Brush head subassembly and electric toothbrush

Technical Field

The utility model relates to an electric toothbrush field especially indicates that brush head assembly locks the field with the torque transmission and the axial retention function of accomplishing the drive shaft with the drive shaft.

Background

As is well known, an electric toothbrush includes a handle assembly including a housing, and a battery, a motor, a control board, etc. disposed in the housing, and a driving shaft hermetically extended from a front end of the housing, the driving shaft being detachably connected to the brush head assembly. When the electric toothbrush is used, the driving shaft of the handle component swings back and forth along the axis at high frequency, the brush head component inserted on the driving shaft is driven to swing back and forth along with the driving shaft, and the bristles on the brush head component are driven to swing to clean teeth. This requires sufficient on-shaft locking force to transmit torque, yet the brush head can be easily removed for cleaning or replacement.

When the brush head assembly swings back and forth along the axis at a high frequency, particularly when the swinging moment and the swinging amplitude are large, if the locking force on the shaft is insufficient, the torque transmission is problematic, and the toothbrush assembly can fall off from the driving shaft when in use.

A known method for providing a locking force on a shaft is to install a coupling member and a C-shaped spring inside a brush head assembly, the C-shaped spring is wrapped outside the coupling member, and a shaft core into which a driving shaft is inserted is formed inside the coupling member; the C-spring exerts sufficient force on the body portion of the coupling member to cause physical contact between the coupling member and one or more contact areas of the drive shaft into and out of the coupling member with sufficient force to lock the brush head.

However, the interface mode has the defect that the drive shaft is stressed in a long distance when being plugged and unplugged, so that the drive shaft is stressed in plugging and unplugging, the locking force on the drive shaft is insufficient due to repeated plugging and unplugging, and the torque is transmitted to cause the falling of the brush head assembly.

SUMMERY OF THE UTILITY MODEL

For the interface mode of overcoming among the prior art brush head subassembly and drive shaft has the defect, there is longer distance's atress process each other during its drive shaft plug for more labouring during the plug, and a lot of plugs easily cause the locking force insufficient on the drive shaft, and the problem is passed out in the torque, leads to the problem that brush head subassembly drops, the utility model provides a brush head subassembly and electric toothbrush.

The utility model provides a brush head component, which comprises a brush head body, a connecting component and a locking core;

the front end of the brush head body is provided with bristles, and the rear end of the brush head body is provided with a component assembly cavity;

the locking core is a deformable elastic piece and comprises a fulcrum stress part positioned in the middle and force application parts positioned at two ends and used for applying elasticity; the connecting line of the two force application parts and the fulcrum stress part is distributed in a V shape;

the coupling component comprises a base part and a component main body, wherein an axial center inserting hole for inserting a driving shaft is formed in the inner axial centers of the base part and the component main body;

the component main body is arranged in the component assembling cavity, a lock cylinder assembling cavity is formed between the component main body and the inner wall of the component assembling cavity, and the lock cylinder assembling cavity is communicated with the axis inserting hole;

the locking core is embedded in the lock core assembly cavity, so that when the driving shaft is inserted into the shaft center inserting hole, the driving shaft is locked by the elastic force generated by elastic deformation of the locking core through the two force application parts.

The utility model discloses a brush head assembly, it sets up component assembly chamber at the end of brush head body to at the deformable locking core of component assembly intracavity installation coupling component and embedding including fulcrum atress portion and the force application portion that elasticity was applied at both ends. This locking core makes when the drive shaft inserts when brushing the interior axle center jack of head subassembly, the head of its drive shaft is through the first application of force portion of two application of force portions of locking core and when not contacting second application of force portion, and the drive shaft can not receive pressure, only when the drive shaft contacts second application of force portion, just begins to receive the elasticity that two application of force portions were applyed through the lever effect of locking core, makes the plug process more convenient and smooth and easy like this. Only when finally inserted in place, the driving shaft is locked by the elastic deformation of the locking core and the generated elastic force acting on the driving shaft through the two force application parts. The locking core enables most of the strokes of the driving shaft in the insertion process to be smooth and convenient, the driving shaft is locked only by generating pressure when the last two force application parts are in contact with the driving shaft, and the locking generated by the elastic force can be kept for a long time. Ensuring the torque transmission and axial holding capacity thereof.

Further, the component assembly cavity sequentially comprises a front limiting hole, a main assembly cavity and a component lock cavity from front to back;

the front end of the component main body of the connecting component is provided with a guide column, the rear end of the component main body is provided with a buckling part, and the buckling part is connected with the base part; the guide post is inserted into the front limit hole; the component body is assembled in the main assembling cavity; the buckling part is locked in the component locking cavity;

the front limiting table is arranged at the joint of the front end of the component main body and the guide column, and the buckle bulge is arranged at the joint of the rear end of the component main body and the buckle part; the lock cylinder assembly cavity is formed between the front limiting table and the buckle bulge and between the front limiting table and the inner wall of the component assembly cavity;

the inner wall of the component assembly cavity at the corresponding position of the lock cylinder assembly cavity is used as a lock cylinder force exerting part, and the lock cylinder force exerting part is abutted against the fulcrum force bearing part when the lock cylinder is stressed, so that the lock cylinder is elastically deformed.

The connecting component and the locking core assembling structure with the specific structure can conveniently and quickly assemble the locking core and the connecting component into the component assembling cavity of the brush head component.

Furthermore, a rear limiting piece is installed at the rear part of the component lock cavity, and the buckle protrusion is clamped into the component lock cavity in front of the rear limiting piece, so that the component main body is installed in the component assembling cavity. This way is easier to manufacture and implement for installation.

Furthermore, a limiting shaft is arranged at the fulcrum stress part in the middle of the locking core, and the locking core is limited in the lock core assembly cavity by the limiting shaft and cannot fall into the axis jack.

Furthermore, a shaft seat is arranged on the part of the component main body, which is positioned between the front limit table and the buckle bulge;

the limiting shaft is arranged in the shaft seat.

Further, a filling piece is also installed in the tail part of the base part. The filler member can guide the insertion of the drive shaft while adjusting the moment of inertia of the brushhead assembly.

Further, the brushhead assembly includes a plurality of locking cores; lock core assembly cavities with the number corresponding to that of the locking cores are formed between the component main body and the inner wall of the component assembly cavity, and the lock core assembly cavities are communicated with the axis jacks; and the locking cores are correspondingly assembled into the locking core assembly cavities.

Furthermore, the locking core is formed by bending an elastic metal sheet, and the force application parts at two ends are of inward-folded structures formed by bending two ends of the elastic metal sheet; two sides of the fulcrum stress part at the middle part form annular limiting rings; the limiting ring enables the locking core to be embedded in the lock core assembly cavity.

The second invention of the utility model provides an electric toothbrush, which comprises a brush head component and a handle component, wherein the handle component comprises a shell, a motor, a control panel and a battery, wherein the motor, the control panel and the battery are arranged in the shell; a drive shaft of the motor extends from the housing; the brushhead assembly is insertable onto the drive shaft.

The utility model discloses an electric toothbrush, it sets up component assembly chamber at the end of brush head body to install the connection component and imbed the deformable locking core including fulcrum atress portion and the force application portion that both ends exerted elasticity at component assembly intracavity. This locking core makes when the drive shaft inserts when brushing the interior axle center jack of head subassembly, the head of its drive shaft is through the first application of force portion of two application of force portions of locking core and when not contacting second application of force portion, and the drive shaft can not receive pressure, only when the drive shaft contacts second application of force portion, just begins to receive the elasticity that two application of force portions were applyed through the lever effect of locking core, makes the plug process more convenient and smooth and easy like this. Only when finally inserted in place, the driving shaft is locked by the elastic deformation of the locking core and the generated pressure acting on the driving shaft through the two force application parts. The locking core enables most of the strokes of the driving shaft in the insertion process to be smooth and convenient, the driving shaft is locked only by generating pressure when the last two force application parts are in contact with the driving shaft, and the locking generated by the elastic force can be kept for a long time. Ensuring the torque transmission and axial holding capacity thereof.

Furthermore, a lock core matching surface matched with the locking core is arranged on the driving shaft; one or two grooves matched with the force application part of the locking core are arranged on the matching surface of the lock core. The recess makes the locking effect more reliable when it is in the locking position. Meanwhile, the elastic deformation of the locking core is partially rebounded, so that the elasticity of the locking core is easier to maintain for a long time.

Drawings

FIG. 1 is a perspective view of an electric toothbrush according to an embodiment of the present invention;

FIG. 2 is an exploded perspective view of a brush head assembly provided in an embodiment of the present invention;

FIG. 3 is an exploded cross-sectional view of a brush head assembly provided in an embodiment of the present invention;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

FIG. 5 is a schematic perspective view of a coupling member provided in an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a coupling member provided in an embodiment of the present invention;

fig. 7 is a perspective view of a lock core according to an embodiment of the present invention;

fig. 8 is a perspective view of another locking core provided in an embodiment of the present invention;

FIG. 9 is a perspective view of the locking core and coupling member assembly provided in accordance with an embodiment of the present invention;

FIG. 10 is a perspective view of another embodiment of the present invention providing an assembly of a locking core and a coupling member;

fig. 11 is a schematic view of a locking core and a driving shaft according to an embodiment of the present invention;

fig. 12 is a perspective view of a further preferred locking core provided in an embodiment of the present invention;

FIG. 13 is a schematic view of the locking core provided in FIG. 12 in cooperation with a drive shaft;

fig. 14 is a schematic view of a preferred modification of the drive shaft provided in an embodiment of the present invention;

fig. 15 is a schematic perspective view of a further preferred embodiment of the present invention, in which locking cores are disposed at upper and lower sides;

FIG. 16 is a schematic view of an unlocked position in which the drive shaft is not fully inserted into the brushhead assembly according to an embodiment of the present invention;

fig. 17 is an enlarged schematic view at B in fig. 16;

FIG. 18 is a schematic view of a locked position of the drive shaft fully inserted into the brushhead assembly, in accordance with an embodiment of the present invention;

fig. 19 is an enlarged schematic view at C in fig. 18.

Wherein, 1, brush head component; 2. a handle assembly;

11. a brush head body; 111. brushing; 112. a component assembly chamber; 1121. a main assembly chamber; 1122. a component lock cavity; 1123. a front limiting hole; 1124. a lock cylinder assembly cavity; 1125. a rear stop; 1126. a lock cylinder force application part;

12. a locking core; 121. a force application part; 122. a limiting shaft; 123. a limiting ring; 121a, a first force application part; 121b, a second force application part; 1211. an arc-shaped face; 124. a fulcrum force receiving portion;

13. a coupling member; 130. an axis jack; 131. a member body; 132. a fastening part; 133. a guide post; 134. a base; 1311. a front limit table; 1312. a shaft seat; 1321. the buckle is protruded; 1301. a lower end landing part of the driving shaft;

14. a filling member;

21. a drive shaft; 211. a lock core matching surface; 212. a component mating surface; 2111. a groove;

22. a power switch;

23. and an indicator light.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in FIG. 1, the present example discloses a power toothbrush comprising a handle assembly 2 and a brushhead assembly 1; in this example, the handle assembly 2 is of a known technique and includes a housing, a motor, a control panel and a battery disposed within the housing; a drive shaft 21 of the motor extends from the housing. The brush head assembly 1 is insertable onto the drive shaft 21. The housing is generally provided with a power switch 22, an indicator light 23, etc., which are not modified in this example and therefore will not be described in detail.

The central inventive concept in this example is to modify the brushhead assembly 1 to better lock the connection with the drive shaft 21. The brush head assembly 1 disclosed in the present application will be further explained in detail with reference to the accompanying drawings.

As shown in fig. 2 and 3, the brush head assembly 1 disclosed in this example comprises a brush head body 11, a coupling member 13 and a lock core 12; the front end of the brush head body 11 is provided with bristles 11, and the rear end is provided with a component assembly cavity 112; the front end and the rear end are relative concepts, and the structure of the brush hair 11 on the brush head body 11 is known and will not be described too much, and the core in this example is the interface structure formed by the rear end inner member assembling cavity 112, the connecting member 13 and the locking core 12. The head body 11 is usually made of plastic material and is formed integrally.

As shown in fig. 4, 5 and 6, the coupling member 13 includes a base 134 and a member main body 131, and an axial center insertion hole 130 for inserting the driving shaft 21 is provided at an axial center of the base 134 and the member main body 131; the hub insertion hole 130 is shaped to fit the drive shaft 21, and is typically configured as an asymmetric insertion hole. When the drive shaft 21 is inserted into the axial center insertion hole 130, the reverse prevention function is provided, and the drive shaft 21 cannot freely rotate in the axial center insertion hole 130, so that the drive shaft 21 and the coupling member 13 are relatively stationary. Thereby enabling the oscillating torque and vibration energy output from the drive shaft 21 to be transmitted to the head body 11, i.e., to the bristles 11 of the head body 11. The component main body 131 is arranged in the component assembling cavity 112, and a lock cylinder assembling cavity 1124 is formed between the component main body and the inner wall of the component assembling cavity 112, and the lock cylinder assembling cavity 1124 is communicated with the shaft center insertion hole 130; the lock cylinder assembly cavity 1124 is used to limit the position of the lock cylinder 12, and its specific shape and position are not limited as long as the lock cylinder 12 does not fall into the axis insertion hole 130, and at the same time, two force application portions 121 (specific reference numbers refer to the following figures) of the lock cylinder 12 can enter the axis insertion hole 130 to form a pressing lock with the driving shaft 21.

As shown in fig. 5 and 6, the base 134 is formed into a flared structure with a diameter gradually enlarged from the member main body 131, and the flared structure makes the member main body 131 closely butt against the end of the head body 11 after being installed into the end of the head body 11. As a result, when the drive shaft 21 of the handle assembly 2 is inserted from the base 134, the distal end of the base 134 (left side in the drawing) is fitted to the end of the housing of the handle assembly 2 from which the drive shaft 21 is drawn.

Specifically, as shown in fig. 7, the locking core 12 is a deformable elastic member, and includes a fulcrum force-receiving portion 124 located at the middle portion and force-applying portions 121 located at the two ends and capable of deforming to apply an elastic force, and a connection line between the two force-applying portions 121 and the fulcrum force-receiving portion 124 is distributed in a V shape; in this embodiment, the whole locking core 12 is in a V-shape or U-shape, and the material of the locking core may be plastic or metal, so that the locking core 12 has a certain elastic deformation capability, and when the force application part 121 is pressed, the fulcrum force receiving part 124 abuts against the key cylinder force application part 1126, so that the locking core 12 is elastically deformed, and further, the two force application parts 121 output elastic force generated by elastic deformation. The specific form and material of the lock core 12 are not particularly limited. So long as it can deform to generate elastic force when being pressed, thereby pressing the driving shaft 21.

The lock core 12 is embedded in the key cylinder assembly cavity 1124, so that when the driving shaft 21 is inserted into the shaft center insertion hole 130, the lock core 12 is deformed by being pressed to generate an elastic force and the two force application parts 121 apply the elastic force to lock the driving shaft 21.

In order to further understand the assembling relationship, as shown in the enlarged view of fig. 4, the component assembling cavity 112 includes a front limiting hole 1123, a main assembling cavity 1121 and a component locking cavity 1122 in sequence from front to back; the "front" is shown on the left side of the paper and the "rear" is shown on the right side of the paper.

As shown in fig. 5 and 6, the member body 131 of the coupling member 13 is provided with a cylindrical guide post 133 at the front end thereof and a latch portion 132 at the rear end thereof, and the latch portion 132 is connected to the base portion 134; of course, the guide post 133 is not necessarily limited to a cylindrical shape, and may be a triangle or a square or other polygonal shape as long as it corresponds to the shape of the front limiting hole 1123. The guide post 133 is inserted into the front limiting hole 1123; the member body 131 is fitted within the main fitting cavity 1121; the latch 132 latches within the member lock chamber 1122;

in this example, a front stopper 1311 is provided at a connection point between the front end of the member body 131 and the guide post 133, and a locking protrusion 1321 is provided at a connection point between the rear end of the member body 131 and the locking part 132; the key cylinder assembly chamber 1124 is formed between the front stopper 1311 and the catch projection 1321, and between inner walls of the member assembly chamber 112; the member lock chamber 1122 takes on the function of catching and locking the entire member body 131 from falling out of the member fitting chamber 112, and therefore, a card slot (not shown) for engaging with the catch projection 1321 needs to be formed therein; in this example, the engaging protrusions 1321 are provided in the vertical and horizontal directions of the member main body 131, and the engaging protrusions 1321 are engaged with the engaging grooves provided in the member lock chamber 1122.

The inner wall of the component assembly cavity 112 at the position corresponding to the lock cylinder assembly cavity 1124 serves as a lock cylinder force exerting part 1126, and the lock cylinder force exerting part 1126 abuts against the fulcrum force exerting part 124 when the locking core 12 is stressed, so that the locking core 12 is elastically deformed.

The structure for assembling the connecting member 13 and the locking core 12 can conveniently and quickly assemble the locking core 12 and the connecting member 13 into the member assembling cavity 112 of the brush head assembly 1.

In this embodiment, the brush head body 11 is an integrally formed plastic member, and since the plastic member has a small size, it is not preferable to form a complicated structure on the inner surface during the forming, in this embodiment, preferably, a rear stopper 1125 is installed at the rear of the member lock cavity 1122, a locking groove is formed in the member lock cavity 1122 by the rear stopper 1125, and the locking protrusion 1321 is locked into the member lock cavity 1122 in front of the rear stopper 1125 (i.e., into the locking groove in the member lock cavity 1122) to fixedly install the member body 131 in the member mounting cavity 112. This way is easier to manufacture and implement for installation.

Similarly, the coupling member 13 is usually made of plastic, which has a certain requirement for wall thickness during molding, and when the wall is too thick, the plastic shrinks unevenly to affect the appearance, and therefore, the base 134 is provided with a trumpet-shaped structure formed by gradually enlarging the diameter, and the filling member 14 can be further installed in the tail of the base 134. The filler 14 can guide the insertion of the drive shaft 21 while adjusting the moment of inertia of the brushhead assembly 1.

The manner in which the lock cylinder 12 is retained in the cylinder assembly cavity 1124 is not particularly limited, and various manners are possible, as will be described in the following examples. For example, as shown in fig. 7, a limiting shaft 122 is disposed at a fulcrum force-receiving portion 124 of the middle portion of the locking core 12, and the limiting shaft 122 limits the locking core 12 in the lock core assembly cavity 1124 and does not fall into the shaft center insertion hole 130.

Preferably, as shown in fig. 5 and 6, a shaft seat 1312 is provided on the member body 131 between the front stopper 1311 and the catch protrusion 1321;

as shown in fig. 5, 6 and 9, the limit shaft 122 is installed in the shaft seat 1312, in this example, the shaft seat 1312 is provided with an annular groove having an engaging notch (not marked) at an upper end thereof, and the limit shaft 122 can be engaged with the engaging notch. The shaft seat 1312 is divided into two left and right parts, and the two limit shafts 122 are respectively installed in the shaft seat 1312, so that the locking core 12 can rotate around the limit shaft 122 and can not be separated from the shaft seat 1312.

Of course, the axle seat 1312 is not necessary, and as shown in fig. 10, even if there is no axle seat 1312, the two position-limiting axles 122 on the locking core 12 can still ensure that the locking core 12 will not fall into the axle center insertion hole 130.

As an example, the locking core 12 may be a plastic part as shown in fig. 2, 3, and 7, or may be made of a metal material. As shown in fig. 8, the locking core 12 is formed by bending an elastic metal sheet, and the force application parts 121 at two ends are inward-folded structures formed by bending two ends of the elastic metal sheet; two sides of the fulcrum bearing part 124 at the middle part form an annular limiting ring 123; the stop collar 123 allows the lock cylinder 12 to be inserted into the lock cylinder assembly cavity 1124 and not to fall out of the lock cylinder assembly cavity 1124 into the spindle hub 130.

As an example, the driving shaft 21 in the handle assembly 2 has two mating surfaces, i.e., a component mating surface 212 mating with the lower attachment portion 1301 of the driving shaft and a lock cylinder mating surface 211 mating with the lock cylinder 12; at least one of the member engagement surface 212 and the plug engagement surface 211 is flat to ensure the insertion direction and the transmission torque.

Preferably, as shown in fig. 11, the driving shaft 21 is provided with a cylinder engagement surface 211 that engages with the lock cylinder 12, and the cylinder engagement surface 211 is preferably a flat surface.

For convenience of explanation, as shown in fig. 11, in this embodiment, the force application portions 121 on the lock core 12 are further respectively labeled, wherein the force application portions 121 are respectively named as a first force application portion 121a and a second force application portion 121b, assuming that the direction along which the drive shaft 21 is inserted into the axial center insertion hole 130; the first biasing portion 121a and the second biasing portion 121b are not particularly limited as long as they can generate elastic force against the drive shaft 21 when pressed by the drive shaft 21.

As another embodiment, as shown in fig. 12 and 13, the lock cylinder engagement surface 211 of the driving shaft 21 that engages with the lock cylinder 12 is a cylindrical surface, and in this case, the force application portion 121 of the locking member is provided as an arc-shaped surface 1211 that engages with the driving shaft 21. The manufacture of the drive shaft 21 is facilitated.

Preferably, as shown in fig. 14, a lock cylinder engagement surface 211 that engages with the lock cylinder 12 is provided on the drive shaft 21; one or two grooves 2111 (two grooves 2111 in this example) are provided in the key cylinder engagement surface 211 to engage with the force application portion 121 of the lock cylinder 12. The notch 2111 may provide a more secure locking effect when in the locked position. At the same time, the elastic deformation of the lock core 12 is partially rebounded, and the change of the stress can make the elasticity of the lock core more easily maintained for a long time.

Preferably, as shown in fig. 15, the brush head assembly 1 comprises a plurality of locking cores 12, for example, an upper locking core 12 and a lower locking core 12; lock core assembly cavities 1124 the number of which corresponds to that of the lock cores 12 are formed between the component main body 131 and the inner wall of the component assembly cavity 112, and the lock core assembly cavities 1124 are communicated with the shaft center insertion hole 130; each of the lock cores 12 is fitted into each of the key cylinder fitting cavities 1124, respectively.

The assembly process of the brush head assembly 1 and the handle assembly 2 disclosed in this example is described as follows:

as shown in fig. 16 and 17, when the tip (or head) of the drive shaft 21 of the handle assembly 2 is gradually inserted into the axial center insertion hole 130 of the brush head assembly 1, the tip (or head) of the drive shaft 21 passes through the first biasing portion 121a of the lock core 12, but does not contact the second biasing portion 121b, the drive shaft 21 is not pressed. The insertion process is convenient and smooth. As shown in fig. 18 and 19, only when the front end (or the head) of the driving shaft 21 contacts the second force application portion 121b, the fulcrum force receiving portion 124 thereof contacts the key cylinder force application portion 1126, and the driving shaft 21 starts to be pressed by both contact portions of the first force application portion 121a and the second force application portion 121b by the small-angle rotation by the lever action of the lock cylinder 12. When the locking member is inserted into the position, the driving shaft 21 is pressed against the driving shaft lower end force application part 1301 on the inner wall of the shaft center insertion hole 130 of the coupling member 13 by the pressure generated by the elastic deformation of the locking core 12 and the combined action of the core force application parts 1126 of the member assembly cavity 112 acting on the driving shaft 21 through the two contact parts of the first force application part 121a and the second force application part 121b, and the driving shaft 21 is locked. The driving shaft 21 starts to bear force only when the second force application part 121b is contacted with the front limiting table 1311, and the force bearing distance is short, so that the plugging and the unplugging are convenient, and abrasion is not easy to generate.

In the electric toothbrush and brushhead assembly 1 disclosed in this example, a member fitting chamber 112 is provided at the distal end of the brushhead body 11, and a coupling member 13 and a lock core 12 including a fulcrum force receiving portion 124 and a force applying portion 121 whose both ends are deformable to apply an elastic force are fitted into the member fitting chamber 112. The locking core 12 makes the head of the driving shaft 21 pass through the first force application part 121a of the two force application parts 121 of the locking core 12 and not contact with the second force application part 121b when the driving shaft 21 is inserted into the axial center insertion hole 130 in the brush head assembly 1, the driving shaft 21 can not be stressed, and only when the driving shaft 21 contacts with the second force application part, the driving shaft 21 starts to receive the elastic force applied by the two force application parts 121 through the lever action of the locking core 12 and the rotation of a small angle, so that the inserting and pulling process is more convenient and smooth. Only when finally inserted into position, the driving shaft 21 is locked by the elastic deformation of the lock core 12 and the generated pressing force acting on the driving shaft 21 through the two urging portions 121. The locking core 12 makes most of the stroke of the insertion of the driving shaft 21 smooth and convenient, and the driving shaft 21 is locked by the pressure generated only when the last two force application parts 121 are in contact with the driving shaft 21, and the locking by the elastic force can be maintained for a long time. Ensuring the torque transmission and axial holding capacity thereof.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A brush head component is characterized by comprising a brush head body, a connecting component and a locking core;

2. The brushhead assembly of claim 1, wherein the member mounting cavity includes, in order from front to back, a front retention aperture, a primary mounting cavity and a member lock cavity;

3. The brushhead assembly of claim 2, wherein a rear retainer is mounted to the rear of the member lock chamber, the snap tabs snapping into the member lock chamber forward of the rear retainer to mount the member body in the member mounting chamber.

4. The brush head assembly of claim 3, wherein a limiting shaft is disposed at the fulcrum bearing portion of the middle portion of the locking core, and the limiting shaft limits the locking core in the lock core assembly cavity and prevents the locking core from falling into the axial insertion hole.

5. The brushhead assembly of claim 4, wherein an axle seat is provided on the body of the member at a location between the front stop and the catch projection;

the limiting shaft is arranged in the shaft seat.

6. The brushhead assembly of claim 1, wherein a filler member is also mounted in the tail portion of the base portion.

7. The brushhead assembly of claim 1, wherein the brushhead assembly includes a plurality of locking cores; lock core assembly cavities with the number corresponding to that of the locking cores are formed between the component main body and the inner wall of the component assembly cavity, and the lock core assembly cavities are communicated with the axis jacks; and the locking cores are correspondingly assembled into the locking core assembly cavities.

8. The brush head assembly of claim 1, wherein the locking core is formed by bending an elastic metal sheet, and the force application parts at two ends are inward-folded structures formed by bending two ends of the elastic metal sheet; two sides of the fulcrum stress part at the middle part form annular limiting rings; the limiting ring enables the locking core to be embedded in the lock core assembly cavity.

9. An electric toothbrush comprising a brushhead assembly and a handle assembly, the handle assembly comprising a housing, a motor disposed within the housing, a control panel and a battery; a drive shaft of the motor extends from the housing; wherein the brushhead assembly of any one of claims 1 to 8 is insertable onto the drive shaft.

10. The electric toothbrush according to claim 9, wherein the driving shaft is provided with a lock cylinder engagement surface for engaging with the lock cylinder; one or two grooves matched with the force application part of the locking core are arranged on the matching surface of the lock core.