CN217525472U - Brush head assembly of electric toothbrush and electric toothbrush - Google Patents

Abstract

The embodiment of the application discloses a brush head assembly of an electric toothbrush and the electric toothbrush, wherein the brush head assembly of the electric toothbrush comprises a connecting shaft and a brush head, the brush head is detachably connected to one end of the connecting shaft and comprises a brush head main body and a brushing part, the brush head main body comprises a head part, a rod part and a metal buckle sleeve, and the head part is connected to one end of the rod part; in the axial direction of the shaft part, the length of the shaft part is less than or equal to that of the head part, and the maximum width W1 of the cross section of the shaft part is less than the maximum width W2 of the cross section of the head part; the end face of the rod part, far away from the head part, is provided with an installation groove, the metal buckle sleeve is of a cylindrical structure with one open end, the metal buckle sleeve is fixedly embedded in the installation groove, and the open direction of the metal buckle sleeve is consistent with the open direction of the installation groove; the inner wall surface of the metal buckle sleeve is provided with a guide groove and a limiting groove.

Description

Brush head assembly of electric toothbrush and electric toothbrush

Technical Field

The application relates to the field of articles for daily use, in particular to a brush head assembly of an electric toothbrush and the electric toothbrush.

Background

The electric toothbrush makes the brush head generate high-frequency vibration through the quick rotation or vibration of the electric machine core, the toothpaste is instantly decomposed into fine foam, when in use, a user puts the brush head of the electric toothbrush into the oral cavity, the slit between the teeth is deeply cleaned through the electric toothbrush, and meanwhile, the vibration of the brush hair can promote the blood circulation in the oral cavity, and the gum tissue is massaged.

Electric toothbrush includes interconnect's handle and brush head, and the brush head is provided with the motor including the head of installing the scrubbing part and the pole portion that is used for connecting the motor shaft in the handle, the motor shaft stretch out the handle and with the pole portion fixed connection of brush head. The connection part of a motor shaft and a brush head of the existing electric toothbrush is close to a handle, and the whole structure of the brush head is longer. The head of the brush head is provided with bristles, the rod part of the brush head extends towards the handle direction, and the diameter of the tail end of the rod part is enlarged to be matched with the handle, so that the whole volume of the brush head is large, and the use comfort is influenced.

The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.

Disclosure of Invention

The main purpose of this application is to provide a brush head assembly of electric toothbrush, aim at solving the whole very big technical problem of volume of current electric toothbrush's brush head.

In order to achieve the above objects, the present invention provides a brush head assembly of an electric toothbrush, including a connecting shaft and a brush head, the brush head being detachably connected to one end of the connecting shaft,

the brush head comprises a brush head main body and a brushing part, the brush head main body comprises a head part, a rod part and a metal buckle sleeve, wherein,

the head is connected to one end of the rod part; in the axial direction of the shaft part, the length of the shaft part is less than or equal to that of the head part, and the maximum width W1 of the cross section of the shaft part is less than the maximum width W2 of the cross section of the head part; the end face of the rod part, far away from the head part, is provided with an installation groove, the metal buckle sleeve is of a cylindrical structure with one open end, the metal buckle sleeve is fixedly embedded in the installation groove, and the open direction of the metal buckle sleeve is consistent with the open direction of the installation groove; the inner wall surface of the metal buckle sleeve is provided with a guide groove and a limiting groove, the guide groove extends along the axial direction of the metal buckle sleeve, the limiting groove is arranged on the side wall surface of the guide groove, and the limiting groove is inwards deviated from an opening of the metal buckle sleeve;

the brushing part is fixedly arranged on the head part;

the connecting shaft comprises a shaft main body and a limiting bulge, the shaft main body comprises an inserting end inserted in an inner cavity of the metal buckle sleeve, the limiting bulge is connected with the inserting end and protrudes out of the outer peripheral surface of the inserting end, and the limiting bulge extends into the inner cavity of the metal buckle sleeve along the guide groove along with the inserting end and is clamped with the limiting groove along with the rotation of the inserting end.

In some examples, the metal snap sleeve has a bottom surface towards its open end; the brush head main body also comprises an elastic piece arranged in the inner cavity of the metal buckle sleeve; when the limiting protrusion is clamped with the limiting groove, one end of the elastic piece is abutted against the insertion end, and the other end of the elastic piece is abutted against the bottom surface of the metal buckle sleeve.

In some examples, the metal snap sleeve comprises an outer snap sleeve and an inner snap sleeve embedded in an inner cavity of the outer snap sleeve;

the outer buckle sleeve is of a cylindrical structure with one open end, the open direction of the outer buckle sleeve is consistent with the open direction of the mounting groove, and the rod part is injected and coated on the outer buckle sleeve; the inner buckle sleeve is of a cylindrical structure with two open ends; the guide groove with the spacing groove is seted up in interior buckle cover, just the guide groove with the spacing groove link up interior outer wall of interior buckle cover.

In some examples, the outer snap sleeve has a bottom surface towards its open end, the bottom surface of the outer snap sleeve being perforated with a first via; the elastic piece is clamped in the first via hole and is in limit fit with the first via hole along the axial direction of the rod part;

the elastic piece comprises a first lug, an intermediate connecting section and a second lug which are sequentially connected, the maximum outer peripheral diameters of the first lug and the second lug are larger than the inner diameter of the first via hole, and the intermediate connecting section is inserted into the first via hole;

the first lug, the second lug and the middle connecting section are integrally arranged and are made of elastic materials; the peripheral surface of the second bump is arranged in a gradually reducing manner along the direction departing from the inserting end.

In some examples, the metal snap sleeve comprises an inner snap sleeve and an outer snap sleeve, wherein,

the inner buckle sleeve is of a cylindrical structure with one open end, and the open direction of the inner buckle sleeve is consistent with the opening direction of the mounting groove; the inner buckle sleeve comprises a first connecting section and a second connecting section connected with the first connecting section, an opening of the inner buckle sleeve is formed in the second connecting section, the guide groove and the limiting groove are both arranged in the second connecting section, and the guide groove and the limiting groove penetrate through the inner wall surface and the outer wall surface of the second connecting section;

the outer buckle sleeve is of a cylindrical structure with two open ends, is sleeved on the periphery of the second connecting section and enables the first connecting section to protrude out of the outer buckle sleeve; the rod part is injected and coated on the first connecting section and the outer buckle sleeve.

In some examples, the outer wall of the second connecting section is convexly provided with a limiting flange, and the limiting flange is arranged close to the first connecting section; the outer buckle sleeve is abutted against the limiting flange; the rod part is further coated on the limiting flange.

In some examples, an inner diameter of the first connection section is smaller than an inner diameter of the second connection section; the inner circumferential surface of the first connecting section is in inclined transition connection with the inner circumferential surface of the second connecting section;

the elastic piece is a compression spring, and the outer diameter of the elastic piece is matched with the inner diameter of the first connecting section; when the limiting protrusion is clamped with the limiting groove, one end of the elastic piece is abutted against the bottom surface of the inner cavity of the first connecting end, and the other end of the elastic piece is abutted against the inserting end.

In some examples, the plugging end is radially provided with a second through hole; the connecting shaft comprises a shaft main body and a locking piece, the locking piece is embedded in the second via hole, and the part, protruding out of the outer peripheral face of the insertion end, of the locking piece forms the limiting protrusion.

In some examples, an annular groove is formed on a sidewall of the second via, the annular groove being formed with a stop surface facing an inner wall surface of the metal snap sleeve; the locking piece comprises a locking part and a convex part connected with the locking part; when the inserting end is inserted into the inner cavity of the metal buckle sleeve, the locking part is embedded in the annular groove, one end of the locking part is abutted against the stop surface, and the other end of the locking part is abutted against the inner wall surface of the metal buckle sleeve; the protruding portion is inserted into the second via hole, and one end, far away from the locking portion, of the protruding portion protrudes out of the outer peripheral surface of the inserting end to form the limiting protrusion.

The application also discloses an electric toothbrush, including handle, motor and as in any one above electric toothbrush's the first subassembly of brush, motor fixed mounting in the handle, the drive end of motor with the one end fixed connection of brush head is kept away from to the connecting axle, the connecting axle is close to the one end of brush head is stretched out the handle setting.

The maximum width of the cross section of the rod part is smaller than that of the cross section of the head part, so that the size of the position of the rod part is reduced, and the brush head can be conveniently placed into an oral cavity; the mounting groove is formed in the rod part, the metal buckle sleeve is embedded in the mounting groove, and the guide groove and the limiting groove are formed in the metal buckle sleeve, so that the brush head can be conveniently integrally molded, and the processing performance of the brush head is improved; the characteristics of convenient slotting and high strength of metal are utilized, so that slotting processing is conveniently carried out on the metal buckle sleeve; through cooperateing at axle main part and spacing arch, insert the inner chamber in-process that the metal buckle overlaps at the grafting end of axle main part, realize spacing bellied simultaneous movement, utilize spacing arch and spacing groove's mutual joint, the restriction is pegged graft and is held along axial removal, and then prevents to brush the head and drop.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a construction of one embodiment of a brushhead assembly of the power toothbrush of the present application;

FIG. 2 is a front view of FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a partial enlarged view of the portion B in FIG. 3;

FIG. 5 is an exploded view of one embodiment of a brushhead assembly of the power toothbrush of the present application;

FIG. 6 is an exploded view of another embodiment of a brushhead assembly of the electric toothbrush of the present application;

FIG. 7 is a right side view of one embodiment of the brushhead assembly of the electric toothbrush of the present application;

FIG. 8 is a cross-sectional view taken along line C-C of FIG. 7;

FIG. 9 is an enlarged view of a portion D of FIG. 8;

FIG. 10 is a cross-sectional view taken along line E-E of FIG. 7;

FIG. 11 is an exploded view of yet another embodiment of a brushhead assembly of the power toothbrush of the present application;

FIG. 12 is a schematic view of an embodiment of the powered toothbrush of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 and 2, the brush head assembly of the electric toothbrush disclosed in the present application has a connecting shaft 30 and a brush head including a brush head body 100 and a brushing part 101, wherein the brush head body 100 is connected to the connecting shaft 30, and the brushing part 101 is used for brushing teeth. The brushing part 101 may be a hair bundle, silica gel, or the like, and only needs to clean teeth. The brushing unit 101 may be fixedly mounted to the head 10 of the head body 100 by means of gluing, clamping, or the like.

Referring to fig. 2, the head 10 is connected to the shaft 11, and the head 10 is disposed at one end of the shaft 11, when the brush head body 100 is manufactured, the shaft 11 and the head 10 may be integrally formed by injection molding, so that the mounting groove 111 is formed during the injection molding process. The length of the stem 11 is equal to or less than the length of the head 10 in the axial direction of the stem 11, and the brush part 101 is fixedly attached to the head 10. The shaft 11 and the head 10 form a unitary head body 100, wherein the shaft 11 and the head 10 may be integrally formed. By making the length of the shaft portion 11 shorter than or equal to the length of the head portion 10, the entire length of the head main body 100 can be shortened to improve the comfort when the head main body 100 is put into the oral cavity. In some examples, the maximum width W1 of the cross section of the shaft portion 11 is smaller than the maximum width W2 of the cross section of the head portion 10, so that the brush head body 100 is in a structure that the cross section is gradually reduced from the head portion 10 to the shaft portion 11, the head portion 10, in which the brushing portion 101 is arranged, in the brush head body 100 has a relatively large volume, and the shaft portion 11 has a relatively small volume, so that the brush head body can be conveniently placed in a mouth, and the comfort is further improved.

Referring to fig. 3 and 4, in some examples, the rod portion 11 is provided with an installation groove 111, the installation groove 111 is a sinking groove arranged along an axial direction of the rod portion 11, wherein one end of the installation groove 111 is open, and for convenience of description, the opening of the installation groove 111 is referred to as an insertion hole 112.

Referring to fig. 5 and 6, in some examples, a metal buckle sleeve 20 is disposed in the mounting groove 111, and the metal buckle sleeve 20 is provided with a guide groove 23 and a limiting groove 24. The metal buckle sleeve 20 is a hollow cylindrical structure, the metal buckle sleeve 20 has an opening, and the opening direction of the metal buckle sleeve 20 is consistent with the insertion hole 112, so that the insertion hole 112 communicates with the inner cavity of the metal buckle sleeve 20. In some examples, the guide groove 23 is disposed along an axial direction of the metal buckle sleeve 20, one end of the guide groove 23 communicates with a section of the open end of the metal buckle sleeve 20, and the other end of the guide groove 23 may penetrate to the other axial end of the metal buckle sleeve 20. The limiting groove 24 is communicated with the guide groove 23, and when the limiting groove 24 is manufactured, a groove can be formed in the side wall of the guide groove 23, so that the extending direction of the limiting groove 24 and the extending direction of the guide groove 23 form a certain included angle. The spacing groove 24 is far away from the opening of the metal buckle sleeve 20, so that the spacing groove 24 has a spacing surface facing away from the opening of the metal buckle sleeve 20. In some examples, the retention groove 24 extends circumferentially of the metal snap sleeve 20. The guide groove 23 and the stopper groove 24 may be provided so as to penetrate the inner and outer wall surfaces of the metal buckle sleeve 20, or may be a recessed groove formed in the inner wall surface of the metal buckle sleeve 20. When the guide groove 23 and the limiting groove 24 are sunken grooves formed in the metal buckle sleeve 20, the rod portion 11 can be coated on the periphery of the metal buckle sleeve 20 through injection molding, and when the injection molding material is solidified, the metal buckle sleeve 20 is similar to a core of the rod portion 11, and the installation groove 111 is naturally formed on the outer portion of the metal buckle sleeve 20.

With continued reference to fig. 4 and fig. 6, in some examples, the connection shaft 30 includes a shaft main body 301 and a limiting protrusion 31, the shaft main body 301 has a plugging end 302, wherein the plugging end 302 is used for being plugged into the mounting groove 111, the limiting protrusion 31 is disposed on the plugging end 302, and the limiting protrusion 31 at least partially protrudes from an outer peripheral surface of the plugging end 302. When the inserting end 302 is inserted into the inner cavity of the metal buckle sleeve 20 from the inserting hole 112, the limiting protrusion 31 moves towards the inside of the metal buckle sleeve 20 along the guide groove 23, and when the inserting end moves to the position of the limiting groove 24, the inserting end 302 is rotated to rotate the inserting end 302 relative to the rod portion 11, and during the synchronous rotation process of the limiting protrusion 31 and the inserting end 302, the limiting protrusion 31 is clamped into the limiting groove 24. The limiting projection 31 at least partially abuts on the limiting surface of the limiting groove 24. Because the limiting groove 24 is formed in the side wall of the guide groove 23, the limiting protrusion 31 is limited in the limiting groove 24, so that the plugging end 302 cannot move axially, and the plugging end 302 is axially limited. In some examples, the stop protrusion 31 is a protrusion integrally formed with the insertion end 302. In some examples, the stop tab 31 is removably coupled to the mating end 302.

Because the length of the rod part 11 is less than or equal to the length of the head part 10, the maximum width of the cross section of the rod part 11 is less than the maximum width of the cross section of the head part 10, and the whole volume of the position of the rod part 11 is relatively small, the processing difficulty of slotting the inner wall surface of the mounting groove 111 at the position of the rod part 11 is increased when the brush head main body 100 is molded; if the injection molding is used to form the groove 23 and the stopper groove 24, the difficulty of demolding the stem portion 11 increases. By adopting the metal buckle sleeve 20 with the inner cavity and arranging the guide groove 23 and the limiting groove 24 in the metal buckle sleeve 20, the guide groove 23 and the limiting groove 24 can be conveniently formed and processed. During the forming process, the metal buckle sleeve 20 may be first provided with the guide groove 23 and the limiting groove 24, and then the metal buckle sleeve 20 and the rod portion 11 may be connected and fixed to each other.

Because the machinable performance of metal material is higher relatively, the shaping degree of difficulty of guide way 23 and spacing groove 24 is lower relatively, can make things convenient for the shaping, and can conveniently process the volume of metal buckle cover 20 littleer, metal buckle cover 20 through the volume littleer mutually supports with pole portion 11, can be favorable to the 11 tip spaces of make full use of pole portion, improve space utilization, and be favorable to further reducing the volume of pole portion 11, when putting into the oral cavity with brush head whole, 11 positions in pole portion of brush head main part 100 are less relatively, make the use of brush head experience better. Because the metal buckle sleeve 20 is made of a relatively high-strength material, the metal buckle sleeve is not easy to deform during slotting, so that the deformation caused by slotting can be avoided, the guide groove 23 and the limiting groove 24 in the preset shapes can be conveniently formed, and the overall appearance of the metal buckle sleeve 20 is not damaged.

Because the overall material strength of the metal buckle sleeve 20 is superior to that of the plastic brush head assembly of the common electric toothbrush, the connection strength can be effectively improved by using the metal buckle sleeve 20 as a connection intermediate structure of the connection shaft 30 and the rod part 11. Since the deformation resistance of the metal buckle sleeve 20 is relatively higher, by clamping the limiting protrusion 31 in the limiting groove 24, when the limiting protrusion 31 moves along the axial direction of the rod part 11, the deformation and damage of the metal buckle sleeve 20 are relatively smaller, and the metal buckle sleeve 20 is not easily damaged.

Referring to fig. 5, in some examples, the metal buckle sleeve 20 is provided with a limiting through groove 28, the inner wall surface of the mounting groove 111 is provided with a bump, and the bump is embedded in the limiting through groove 28, so that the bump limits the relative movement of the metal buckle sleeve 20 and prevents the metal buckle sleeve 20 from being dislocated. When the rod portion 11 is coated outside the metal buckle sleeve 20 by injection molding, the injection molding material enters the limiting through groove 28 in the metal buckle sleeve 20, and a bump structure is formed.

Referring to fig. 4, in some examples, an annular flange is disposed on an inner wall surface of the insertion hole 112 of the mounting groove 111, and an open end of the metal snap sleeve 20 abuts against the annular flange to prevent the metal snap sleeve 20 from moving axially.

When the shaft 11 is molded, the metal snap sleeve 20 is placed at a predetermined position in a mold, and after the shaft 11 is injection molded, an injection molding material covers the metal snap sleeve 20 to form an annular flange structure at one axial end of the shaft 11.

Referring to fig. 4, in some examples, the metal snap sleeve 20 includes an outer snap sleeve 21 and an inner snap sleeve 22, wherein the outer snap sleeve 21 is a hollow cylindrical structure with an open end, and the open end of the outer snap sleeve 21 is coincident with the insertion hole 112; the inner buckle sleeve 22 is embedded in the inner cavity of the outer buckle sleeve 21, the inner buckle sleeve 22 can be a hollow cylindrical structure with two open ends, and the guide groove 23 and the limiting groove 24 can be arranged on the inner buckle sleeve 22. The strength of the metal snap sleeve 20 can be improved by adopting the outer snap sleeve 21 and the inner snap sleeve 22 to cooperate. In some examples, the limiting groove 24 and the guide groove 23 penetrate through the inner and outer surfaces of the inner snap sleeve 22, and when the inner snap sleeve 22 is machined, the groove can be directly formed along the radial direction of the inner snap sleeve 22, so that the limiting groove 24 and the guide groove 23 can be quickly machined. In some examples, the stopper groove 24 is opened in a side wall of one axial end of the guide groove 23. The inner snap sleeve 22 has a proximal end near the insertion hole and a distal end far from the insertion hole, wherein a limiting groove 24 is opened at the distal end of the inner snap sleeve 22 to facilitate the opening of the groove.

Since the outer buckle sleeve 21 is sleeved on the periphery of the inner buckle sleeve 22, the outer buckle sleeve 21 covers the outer surface of the inner buckle sleeve 22. When the rod part 11 is formed by injection molding, the injection molding material covers the outer wall of the outer buckle sleeve 21, and the injection molding material cannot enter the limiting groove 24 and the guide groove 23 of the inner buckle sleeve 22 through the shielding of the outer buckle sleeve 21, so that the blocking of the limiting groove 24 and the guide groove 23 is avoided.

Referring to fig. 4, in order to prevent the connection shaft 30 from falling off, in some examples, the head body 100 further includes an elastic member 25. The metal snap fit sleeve 20 has a bottom surface facing the open end thereof, the elastic member 25 is disposed adjacent to the bottom surface of the metal snap fit sleeve 20, and the elastic member 25 is located between the bottom surface of the metal snap fit sleeve 20 and the end surface of the plug end 302 when the plug end 302 is inserted into the metal snap fit sleeve 20. When the limiting protrusion 31 is engaged with the limiting groove 24, the elastic member 25 elastically abuts against the end surface of the insertion end 302. In some examples, the elastic member 25 may be a spring, a rubber block, or a combination of various structures having elasticity. Through setting up elastic component 25, after spacing protruding 31 joint to spacing inslot 24, elastic component 25 produced the elastic force of outside butt to plug-in terminal 302, and spacing protruding 31 receives the elastic force effect, and the butt is on spacing face, and then makes spacing protruding 31 compressed tightly in spacing inslot 24, prevents that spacing protruding 31 from deviating from in spacing inslot 24 to improve connecting axle 30's stability.

In some examples, the inner snap sleeve 22 is a cylindrical structure with two open ends, the outer snap sleeve 21 has a bottom surface facing the open end thereof, one end of the elastic member 25 abuts on the bottom surface of the outer snap sleeve 21, and the other end of the elastic member 25 extends into the inner snap sleeve 22 from one axial end of the inner snap sleeve 22. When the limiting protrusion 31 is clamped in the limiting groove 24, the other end of the elastic element 25 abuts against the end face of the insertion end 302.

Referring to fig. 4 and 6, in some examples, the elastic member 25 is a cylinder or a combination of a plurality of cylinder structures. In order to facilitate fixing of the elastic member 25, in some examples, the elastic member 25 includes a first protrusion 251, an intermediate connecting section 253, and a second protrusion 252 connected in sequence, wherein a maximum outer diameter of the first protrusion 251 and the second protrusion 252 is larger than a maximum outer diameter of the intermediate connecting section 253, so that the elastic member 25 has a structure with two large ends and a small middle. The bottom surface of the outer buckle sleeve 21 is provided with a first through hole 211, and the maximum outer peripheral diameters of the first convex block 251 and the second convex block 252 are both larger than the inner diameter of the first through hole 211. The middle connecting section 253 of the elastic member 25 is inserted into the first through hole 211, and the first projection 251 and the second projection 252 of the elastic member 25 are respectively clamped at two axial ends of the first through hole 211 to clamp the elastic member 25 on the bottom surface of the outer clamping sleeve 21. In some examples, the first projection 251, the second projection 252 and the intermediate connecting section 253 of the elastic member 25 are integrally formed, and are made of an elastic material, for example, the elastic member 25 may be integrally formed by rubber. In some examples, the second bump 252 penetrates through the first via hole 211, so that the second bump 252 is located outside the outer snap sleeve 21, one end of the first bump 251 facing the bottom surface of the outer snap sleeve 21 abuts against the outer snap sleeve 21, and one side of the first bump 251 facing away from the bottom surface of the outer snap sleeve 21 may be used to abut against the end surface of the inserting end 302. In order to facilitate the elastic member 25 to be clamped on the first via hole 211 of the outer clamping sleeve 21, in some examples, the second protrusion 252 is located at the outer side of the outer clamping sleeve 21, the first protrusion 251 is located at the inner side of the outer clamping sleeve 21, and the outer peripheral surface of the second protrusion 252 is tapered along a direction departing from the insertion end 302, so that the second protrusion 252 has a tapered structure to facilitate the insertion thereof into the first via hole 211, thereby improving the installation efficiency.

Referring to fig. 7, 8 and 9, in some examples, the metal snap-fit sleeve 20 includes an outer snap-fit sleeve 21 and an inner snap-fit sleeve 22, wherein the inner snap-fit sleeve 22 is a cylindrical structure with an open end, the open direction of the inner snap-fit sleeve 22 is consistent with the insertion hole 112, the outer snap-fit sleeve 21 is a cylindrical structure with open ends, the inner snap-fit sleeve 22 is partially embedded in the inner cavity of the outer snap-fit sleeve 21, and the guide groove 23 and the limiting groove 24 are both formed on the inner snap-fit sleeve 22. By adopting the inner layer and the outer layer, the strength of the metal buckle sleeve 20 can be improved, and the metal buckle sleeve 20 is prevented from deforming. In some examples, the inner snap sleeve 22 includes a first connecting section 261 and a second connecting section 262 connected with each other, the second connecting section 262 is a hollow cylindrical structure with two open ends, and the guide groove 23 and the limiting groove 24 are opened on the second connecting section 262. The first connecting section 261 has a bottom wall facing the insertion hole 112, the second connecting section 262 of the outer buckle sleeve 21 is embedded in the inner cavity of the outer buckle sleeve 21, and the metal buckle sleeve 20 forms an inner-outer double-layer structure at the second connecting section 262 of the inner buckle sleeve 22. The guide groove 23 and the limiting groove 24 are disposed to penetrate through the inner and outer wall surfaces of the second connection section 262, so as to facilitate rapid grooving on the second connection section 262. The rod portion 11 is injection molded and coated on the outer snap sleeve 21 and the first connecting section 261 to facilitate rapid molding. The outer buckle sleeve 21 is sleeved, so that the injection molding material can be blocked by the outer buckle sleeve 21, and the injection molding material is prevented from blocking the guide groove 23 and the limiting groove 24.

Referring to fig. 10 and 11, in some examples, when the elastic element 25 is disposed, the elastic element 25 is a spring, the elastic element 25 is disposed along the axial direction of the inner snap sleeve 22, one end of the elastic element 25 abuts against the bottom wall of the first connection section 261, and the other end of the elastic element 25 extends toward the insertion hole 112, so that the other end of the elastic element 25 can abut against the end surface of the insertion end 302. To avoid the elastic member 25 from falling off, in some examples, the inner diameter of the first connecting section 261 is smaller than the inner diameter of the inner cavity of the second connecting section 262, and the outer diameter of the elastic member 25 is matched with the inner diameter of the first connecting section 261, so as to facilitate the elastic member 25 to be partially clamped in the first connecting section 261, and prevent the elastic member 25 from falling off. In some examples, to facilitate installation of the elastic member 25, the inner peripheral surfaces of the first connecting section 261 and the second connecting section 262 are connected in a slant transition.

Referring to fig. 11, in order to limit the outer snap sleeve 21 conveniently, in some examples, the second connecting section 262 is provided with a limiting flange 263, the limiting flange 263 is disposed near the first connecting section 261, and when the outer snap sleeve 21 is sleeved on the second connecting section 262, an axial end surface of the outer snap sleeve 21 abuts against the limiting flange 263 to limit the outer snap sleeve 21. When the shaft 11 is formed, the shaft 11 is injection molded and covers the first connecting section 261, the limiting flange 263 and the external snap-fit sleeve 21. The stop flange 263 may have the same outer diameter as the outer snap ring 21 to facilitate the process, improve the surface smoothness of the metal snap ring 20 during injection molding, and further reduce the injection molding defects.

Referring to fig. 9 and 11, in some examples, the plugging end 302 has a second through hole 32 formed thereon along the radial direction; the connecting shaft comprises a shaft main body and a locking piece, wherein the locking piece is embedded in the second via hole 32, and the part of the locking piece protruding out of the second via hole 32 forms a limiting protrusion 31. The locking member may have a substantially T-shaped structure, such that the locking member is partially retained at one axial end of the second through hole 32, and the locking member partially protrudes from the second through hole 32 and protrudes from the outer circumferential surface of the insertion end to form a retaining protrusion 31.

In order to limit the locking member conveniently, in some examples, an annular groove 27 is formed in a side wall of the second through hole 32, the annular groove 27 is formed with a stop surface facing an inner wall surface of the metal snap sleeve 20, and the locking member partially abuts against the stop surface to limit the locking member from moving in the axial direction along the second through hole 32.

In some examples, the locking member includes a locking portion 311 and a protruding portion 312 connected to the locking portion 311, the locking portion 311 stops and limits at one axial end of the second via hole 32, and the locking portion 311 is embedded in the annular groove 27; the protruding portion 312 penetrates through the second via hole 32, and a limiting protrusion 31 is formed at one end of the protruding portion 312, which is far away from the locking portion 311, and the limiting protrusion 31 protrudes out of the other axial end of the second via hole 32 and protrudes out of the outer peripheral surface of the insertion end 302. The maximum outer circumferential diameter of the locking portion 311 is larger than the inner diameter of the second through hole 32 so that the locking portion 311 cannot be inserted into the second through hole 32. The maximum outer peripheral diameter of the protrusion 312 is smaller than the inner diameter of the second through hole 32, so that the protrusion 312 can penetrate through the second through hole 32 and partially protrude outside the second through hole 32. When the inserting end 302 and the limiting protrusion 31 are inserted into the inner cavity of the metal buckle sleeve 20, one end of the locking portion 311 abuts against the stop surface formed by the annular groove 27, and the end surface of the locking portion 311 away from the protruding portion 312 can abut against the inner wall surface of the metal buckle sleeve 20, so that the limiting protrusion 31 is prevented from falling off.

Referring to fig. 12, the present application further provides an embodiment of a powered toothbrush based on a brushhead assembly of the powered toothbrush. The electric toothbrush includes a handle 40, a motor, and a brushhead assembly of the electric toothbrush as described in any one of the examples above. The motor is arranged in the handle 40, the driving end of the motor is fixedly connected with one end, far away from the toothbrush head, of the connecting shaft 30 of the toothbrush head assembly of the electric toothbrush, and one end, close to the toothbrush head, of the connecting shaft 30 extends out of the handle 40. The connecting shaft 30 serves to transmit the vibration of the motor to the head body 100 to achieve the relative movement of the head body 100. Since the mounting groove 111 of the shaft 11 of the head body 100 can be relatively reduced, the overall volume of the head body 100 is reduced, and the comfort in use is greatly improved when the head body 100 is put into the mouth.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A brush head component of an electric toothbrush comprises a connecting shaft and a brush head, wherein the brush head is detachably connected with one end of the connecting shaft,

the brush head comprises a brush head main body and a brushing part, the brush head main body comprises a head part, a rod part and a metal buckle sleeve, wherein,

the head part is connected to one end of the rod part; in the axial direction of the shaft part, the length of the shaft part is less than or equal to that of the head part, and the maximum width W1 of the cross section of the shaft part is less than the maximum width W2 of the cross section of the head part; the end face of the rod part, which is far away from the head part, is provided with a mounting groove, the metal buckle sleeve is of a cylindrical structure with one open end, the metal buckle sleeve is fixedly embedded in the mounting groove, and the open direction of the metal buckle sleeve is consistent with the opening direction of the mounting groove; the inner wall surface of the metal buckle sleeve is provided with a guide groove and a limiting groove, the guide groove extends along the axial direction of the metal buckle sleeve, the limiting groove is arranged on the side wall surface of the guide groove, and the limiting groove is inwards deviated from an opening of the metal buckle sleeve;

the brushing part is fixedly arranged on the head part;

the connecting shaft comprises a shaft main body and a limiting bulge, the shaft main body comprises an inserting end inserted in the inner cavity of the metal buckle sleeve, the limiting bulge is connected with the inserting end and protrudes out of the outer peripheral surface of the inserting end, and the limiting bulge extends into the inner cavity of the metal buckle sleeve along with the inserting end along the guide groove and is clamped with the limiting groove along with the rotation of the inserting end.

2. The brushhead assembly of the electric toothbrush of claim 1, wherein the metal snap sleeve has a bottom surface toward its open end; the brush head main body also comprises an elastic piece arranged in the inner cavity of the metal buckle sleeve; when the limiting protrusion is clamped with the limiting groove, one end of the elastic piece is abutted against the insertion end, and the other end of the elastic piece is abutted against the bottom surface of the metal buckle sleeve.

3. The brushhead assembly of the power toothbrush of claim 2, wherein the metal snap fit sleeve includes an outer snap fit sleeve and an inner snap fit sleeve disposed in an interior cavity of the outer snap fit sleeve;

the outer buckle sleeve is of a cylindrical structure with one open end, the open direction of the outer buckle sleeve is consistent with the open direction of the mounting groove, and the rod part is injected and coated on the outer buckle sleeve; the inner buckle sleeve is of a cylindrical structure with two open ends; the guide groove with the spacing groove is seted up in interior buckle cover, just the guide groove with the spacing groove link up interior outer wall of interior buckle cover.

4. The brushhead assembly of claim 3, wherein the outer snap sleeve has a bottom surface facing the open end thereof, the bottom surface of the outer snap sleeve being formed with a first through hole; the elastic piece is clamped in the first via hole and is in limit fit with the first via hole along the axial direction of the rod part;

the elastic piece comprises a first lug, an intermediate connecting section and a second lug which are sequentially connected, the maximum outer peripheral diameters of the first lug and the second lug are larger than the inner diameter of the first via hole, and the intermediate connecting section is inserted into the first via hole;

the first lug, the second lug and the middle connecting section are integrally arranged and are made of elastic materials; the peripheral surface of the second bump is arranged in a gradually reducing manner along the direction departing from the inserting end.

5. The brushhead assembly of the power toothbrush of claim 2, wherein the metal snap sleeve includes an inner snap sleeve and an outer snap sleeve, wherein,

the inner buckle sleeve is of a cylindrical structure with one open end, and the open direction of the inner buckle sleeve is consistent with the opening direction of the mounting groove; the inner buckle sleeve comprises a first connecting section and a second connecting section connected with the first connecting section, an opening of the inner buckle sleeve is formed in the second connecting section, the guide groove and the limiting groove are formed in the second connecting section, and the guide groove and the limiting groove penetrate through the inner wall surface and the outer wall surface of the second connecting section;

the outer buckle sleeve is of a cylindrical structure with two open ends, is sleeved on the periphery of the second connecting section and enables the first connecting section to protrude out of the outer buckle sleeve; the rod part is injected and coated on the first connecting section and the outer buckle sleeve.

6. The brushhead assembly of claim 5, wherein a retaining flange is raised from the outer wall of the second attachment section, the retaining flange being located adjacent the first attachment section; the outer buckle sleeve is abutted against the limiting flange; the rod part is further coated on the limiting flange.

7. The brushhead assembly of the electric toothbrush of claim 6, wherein the inner diameter of the first connecting section is smaller than the inner diameter of the second connecting section; the inner circumferential surface of the first connecting section is in inclined transition connection with the inner circumferential surface of the second connecting section;

the elastic piece is a compression spring, and the outer diameter of the elastic piece is matched with the inner diameter of the first connecting section; when the limiting protrusion is clamped with the limiting groove, one end of the elastic piece is abutted against the bottom surface of the inner cavity of the first connecting end, and the other end of the elastic piece is abutted against the inserting end.

8. The brushhead assembly of an electric toothbrush, according to any one of claims 1 to 7, wherein the spigot end has a second through hole formed radially thereon; the connecting shaft comprises a shaft main body and a locking piece, the locking piece is embedded in the second via hole, and the part, protruding out of the outer peripheral face of the insertion end, of the locking piece forms the limiting protrusion.

9. The brushhead assembly of an electric toothbrush, according to claim 8, wherein an annular groove is formed in the side wall of the second through hole, the annular groove being formed with a stop surface facing the inner wall surface of the metal snap sleeve; the locking piece comprises a locking part and a convex part connected with the locking part; when the inserting end is inserted into the inner cavity of the metal buckle sleeve, the locking part is embedded in the annular groove, one end of the locking part is abutted against the stop surface, and the other end of the locking part is abutted against the inner wall surface of the metal buckle sleeve; the protruding portion is inserted into the second via hole, and one end, far away from the locking portion, of the protruding portion protrudes out of the outer peripheral surface of the inserting end to form the limiting protrusion.

10. An electric toothbrush, characterized in that, includes a handle, a motor and a brush head assembly of the electric toothbrush according to any one of claims 1 to 9, the motor is fixedly installed in the handle, the driving end of the motor is fixedly connected with one end of the connecting shaft far away from the brush head, and one end of the connecting shaft near the brush head is extended out of the handle.

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