Patent ID: 12186149

DESCRIPTIONS OF REFERENCE NUMERALS

100: electric toothbrush head;200: drive mechanism;300: handle;301: clamping protrusion;1: housing;11: mounting cavity;111: shock absorbing pad;112: spring seat;113: accommodating groove;12: mounting hole;13: tail hood;131: clamping groove;132: clamping hole;14: buckle;15: second fixed hole;2: transmission assembly;21: first transmission rod;211: movable portion;212: movable groove;213: first push rod;214: second push rod;215: connecting seat;216: spring;217: screw hole;218: first shaft hole;219: protrusion;22: second transmission rod;221: second shaft hole;23: third transmission rod;231: first fixed hole;232: third shaft hole;24: rotating shaft;3: cleaning head;31: rotating base;32: bristle;33: mounting seat;331: first rotating groove;332: second rotating groove;333: avoidance groove;334: limiting groove;4: first limiting post;5: second limiting post;51: metal sleeve;6: third limiting post;7: limiting bolt;8: connecting member;81: soft rubber ball disk;82: soft rubber suction disk;83: groove; and9: magnetic member.

The realization of the objectives, the functional features, and the advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the drawings.

DETAILED DESCRIPTION OF EMBODIMENTS

The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to drawings in the embodiments of the present invention. It is clear that the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear) are involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationships, the motion situations and the like between individual components under a certain pose (as shown in the drawings), and if the certain pose is changed, the directional indications are changed accordingly.

In addition, if there are descriptions relating to “first”, “second” and the like in the embodiments of the present invention, the descriptions of “first”, “second” and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance thereof or implicitly indicating the quantities of the indicated technical features. Thus, a feature defined by “first” or “second” may explicitly or implicitly include at least one such feature. In addition, “and/or” appearing herein is meant to include three parallel solutions, and taking “A and/or B” as an example, it includes solution A, or solution B, or both solution A and solution B. In addition, the technical solutions among various embodiments may be combined with each other, however, this combination must be based on that it can be realized by those of ordinary skill in the art. When the combination of the technical solutions is contradictory or cannot be realized, such a combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring toFIGS.1to10, the present invention provides an electric toothbrush head100. The electric toothbrush head100comprises: a housing1, wherein the housing1is provided with a mounting cavity11and a mounting hole12communicated with the mounting cavity11; a transmission assembly2, wherein the transmission assembly2is arranged in the mounting cavity11, the transmission assembly2comprises a first transmission rod21, a second transmission rod22and a third transmission rod23, one end of the first transmission rod21, one end of the second transmission rod22and one end of the third transmission rod23are rotatably connected through a rotating shaft24, and the other end of the third transmission rod23is hinged in the mounting cavity11; and a cleaning head3, wherein the cleaning head3is rotatably mounted in the mounting cavity11from the mounting hole12, a bottom of the cleaning head3is eccentrically provided with a first rotating groove331, and one end of the second transmission rod22away from the first transmission rod21is arranged in the first rotating groove331.

Specifically, the electric toothbrush head100is mounted on an electric toothbrush, and the electric toothbrush at least comprises a drive mechanism200for driving the first transmission rod21on the electric toothbrush head100to reciprocate up and down; in addition, the electric toothbrush head further comprises a handle300for accommodating the drive mechanism200and mounting the electric toothbrush head100. The drive mechanism200is well known in the art and is not limited herein. In an example, the drive mechanism200may transmit power by using a magnetic principle, and the drive mechanism200based on the magnetic principle usually controls an internal magnet to engage with a magnetic component on the electric toothbrush head100by using a built-in small direct current motor. When the motor rotates, the power can be transmitted to the transmission assembly2in the electric toothbrush head100through a magnetic action, so that the transmission assembly reciprocates up and down, and the cleaning head3is driven to rotate under the action of the transmission assembly2, thereby achieving the cleaning action. In another example, the drive mechanism200may also be directly in a form of a motor and a push-pull rod, and the push-pull rod is driven by the motor to move linearly, so as to drive the transmission assembly2in the electric toothbrush head100to reciprocate up and down.

The housing1is configured to accommodate the remaining structures of the electric toothbrush head100. The shapes of the housing1, the mounting cavity11and the mounting hole12are not subject to excessive limitations, as long as a mounting space is reserved for the remaining structures. The mounting cavity11is formed along a length direction of the housing1, the mounting hole12is of a through-hole structure, the mounting hole12is formed at a top of the housing1and communicated with the mounting cavity11, and the mounting hole12is configured to mount the cleaning head3.

Further, the transmission assembly2is configured to transmit a force from the drive mechanism200of the electric toothbrush to the cleaning head3to achieve rotation of the cleaning head3. One end of the first transmission rod21is connected to the drive mechanism200of the electric toothbrush, so that the drive mechanism200drives the first transmission rod21to reciprocate along a length direction of the mounting cavity11. The second transmission rod22and the third transmission rod23are rotatably connected to one end of the first transmission rod21away from the drive mechanism200through a rotating shaft24, wherein the rotating shaft24includes but is not limited to a screw, a pin, a rivet and other structures, shaft holes for the rotating shaft24to penetrate through are respectively formed between the first transmission rod21, the second transmission rod22and the third transmission rod23, when the first transmission rod21, the second transmission rod22and the third transmission rod23are hinged, the shaft holes on the transmission rods are coaxially arranged, the first transmission rod21, the second transmission rod22and the third transmission rod23are movably connected by sequentially penetrating the rotating shaft24through the shaft holes of the transmission rods, and the first transmission rod21, the second transmission rod22and the third transmission rod23can rotate around the rotating shaft24.

Furthermore, the cleaning head3is of a block structure with bristles32, and the cleaning head3is connected to the second transmission rod22and is driven to rotate when the second transmission rod22moves eccentrically. The second transmission rod22and the third transmission rod23are rotatably connected to one end of the first transmission rod21away from the drive mechanism200through a rotating shaft24, so that in the up-and-down movement of the first transmission rod21, the second transmission rod22also synchronously moves up and down and rotates around the rotating shaft24, thereby driving the cleaning head3connected to the other end of the second transmission rod22to rotate. Meanwhile, one end of the third transmission rod23also rotates around the rotating shaft22, since one end of the third transmission rod23away from the rotating shaft22is hinged to an inner wall of the mounting cavity11, the third transmission rod23is still limited to the inner wall of the mounting cavity11when swinging due to the force applied by the first transmission rod21, and in this case, the third transmission rod23provides a pulling force to the second transmission rod22, which ensures the second transmission rod22keeps stably stressed in the movement process, and prevents the second transmission rod22from greatly deviating from a track in the high-speed movement of the transmission assembly2, causing uneven power transmission to the cleaning head3and affecting the cleaning effect and user experience.

In this embodiment, a mounting seat33protrudes from one side of the cleaning head3away from the bristles32, and the mounting seat33is mounted in the mounting cavity11and connected to the second transmission rod22of the transmission assembly2. In the reciprocating motion of the first transmission rod21along a length direction of an inner cavity, the second transmission rod22and the third transmission rod23synchronously move, and meanwhile the second transmission rod22swings towards two sides under the action of the rotating shaft24to drive the cleaning head3at the other end of the second transmission rod22to rotate. In addition, one end of the third transmission rod23is constrained in the mounting cavity11, and when one end of the third transmission rod connected to the rotating shaft24moves along with the first transmission rod, the other end of the third transmission rod provides a pulling force for the second transmission rod22, which ensures the second transmission rod22keeps stably stressed in the movement process, and prevents the second transmission rod22from greatly deviating from a track in the high-speed movement of the transmission assembly2, causing uneven power transmission to the cleaning head3.

Referring toFIGS.2to10, in an embodiment, an inner wall of the mounting cavity11is provided with a first limiting post4, and an end portion of the third transmission rod is provided with a first fixed hole231rotatably mounted with the first limiting post4. The housing1and the first limiting post4may be of an integrally formed structure, and an assembling position may also be provided in the mounting cavity11to fix the first limiting post4. Meanwhile, a first fixed hole231is formed in an end portion of the third transmission rod23, the first fixed hole231is a through hole, the third transmission rod23and the first limiting post4are rotatably connected in a shaft hole fitting manner, the first limiting post4is configured to ensure that the third transmission rod23is limited at a specific position, a connecting structure is provided between the third transmission rod23and the housing1, and meanwhile, the first limiting post4is used to achieve hinging of the third transmission rod23, which improves the structural rotation strength, so that the rotation process of the entire structure is more stable, and the entire structure can bear stress of the transmission assembly2in the movement process.

Referring toFIGS.4to10, in an embodiment, one end of the second transmission rod22is provided with a second limiting post5, and the second limiting post5is positioned in the first rotating groove331. The second limiting post5may be fixedly connected to the second transmission rod22, and one end of the second limiting post5away from the second transmission rod22is rotatably arranged in the first rotating groove331. In an optional embodiment, the second limiting post5may also be rotatably connected to the second transmission rod22, so that the force transmission between the second transmission rod22and the cleaning head3is smoother. The second limiting post5is used as a connection structure between the second transmission rod22and the cleaning head3, and is configured to transmit the force of the second limit rod moving up and down and swinging towards two sides to the cleaning head3, so as to rotate the cleaning head3.

Referring toFIGS.4to10, in an embodiment, the inner wall of the mounting cavity11is further provided with a third limiting post6, a second rotating groove332rotatably connected to the third limiting post6is formed in the bottom of the cleaning head3, and the second rotating groove332is positioned at a rotation center of the cleaning head3. The third limiting post6is arranged between the cleaning head3and the mounting cavity11to serve as a structure for achieving rotary connection, which further limits the movement range of the cleaning head3, the movement track of the cleaning head3is adjusted to move in an arc around the third limiting post6, and since the cleaning head3is limited in the mounting cavity11by the third limiting column6, when the second transmission rod22moves to drive the cleaning head3to move, the cleaning head3will not deviate from the movement track, so that the rotation stability of the cleaning head3is further improved. In addition, since the third limiting post6is positioned at the rotation center, when the second transmission rod22swings, the movement track of the second transmission rod is blocked by the third limiting post6, and the second transmission rod22can only drive the cleaning head3to rotate in an amplitude of about 30° in a reciprocating manner, so that the rotation stability of the cleaning head3is improved.

Referring toFIGS.4to8, in an embodiment, the first transmission rod21is provided with a movable portion211, the movable portion211is provided with a movable groove212, the second transmission rod22is inserted into the movable groove212, and the third transmission rod23is arranged outside the movable portion211. In an example, two side plates are convexly arranged at one end of the movable portion211, the movable groove212is formed between the two side plates, a through hole is formed in each of the two side plates, the two through holes are both communicated with the movable groove212, through holes for the rotating shaft24to penetrate through are formed in two sides of the movable groove212, the second transmission rod22is arranged in the movable groove212through the rotating shaft24, and meanwhile, one end that is of the rotating shaft24and that is far away from a connection with the second transmission rod22extends out of the movable groove212to connect to the third transmission rod23outside the movable portion211. In another optional embodiment, the movable groove212may not be provided, and only a through hole is formed on the movable portion211, and the rotating shaft24penetrates through the through hole and extends out from two sides, so as to rotatably connect two ends of the rotating shaft24to the second transmission rod22and the third transmission rod23respectively. The design of the movable groove212improves the stability of the second transmission rod22, and the second transmission rod22is limited in the movable groove212to avoid shaking towards a direction perpendicular to the movement track in the movement process, which affects the stability of the entire movement. Meanwhile, the second transmission rod22and the third transmission rod23are arranged at an inner side and an outer side of the movable portion211respectively, so that the second transmission rod and the third transmission rod are prevented from structural interference in the movement process.

Referring toFIGS.4to10, in an embodiment, two opposite sides of the movable portion211are provided with first shaft holes218, one end of the second transmission rod22far away from the second limiting post5is provided with a second shaft hole221, one end of the third transmission rod23far away from the first limiting post4is provided with a third shaft hole232, and the rotating shaft24penetrates through the first shaft holes218, the second shaft hole221and the third shaft hole232. Specifically, the first shaft hole218, the second shaft hole221and the third shaft hole232are all of through hole structures, in the assembling process, the second transmission rod22is placed into the movable groove212, the third transmission rod23is lapped on the outer side of the movable portion211, the first shaft hole218, the second shaft hole221and the third shaft hole232are butted through fine position adjustment to ensure that the first transmission rod21, the second transmission rod22and the third transmission rod23are placed at corresponding positions, and then the rotating shaft24movably penetrates through the first shaft hole218, the second shaft hole221and the third shaft hole232, and therefore movable connection among the three transmission rods is achieved. Further, the first shaft hole218, the second shaft hole221and the third shaft hole232are all arranged on end portions of the corresponding structures, so that energy loss in the transmission process is reduced, and the efficiency of force transmission is improved.

Referring toFIGS.4to8, in an embodiment, the first transmission rod21comprises a first push rod213and a second push rod214fixedly connected to the first push rod213, one end of the second push rod214far away from the first push rod213is rotatably connected to the second transmission rod22and the third transmission rod23, and an included angle between the first push rod213and the second push rod214is an obtuse angle. The first push rod213and the second push rod214may be of an integrally formed structure, so that the first push rod213and the second push rod214can work cooperatively when the first transmission rod21moves, and one end of the second push rod214away from the first push rod213extends to form the movable portion211to connect to the second transmission rod22and the third transmission rod23, so that force transmission and rotation are achieved. The obtuse angle between the first push rod213and the second push rod214helps to adjust the angle and output size of the force transmitted from the first transmission rod21to the second transmission rod22.

Referring toFIGS.4to8, in an embodiment, an included angle between the second push rod214and the third transmission rod23is greater than an included angle between the second transmission rod22and the third transmission rod23. In a specific implementation, a range of the included angle between the third transmission rod23and the second push rod214and the second transmission rod22can be adjusted by changing the mounting position of the third transmission rod23. In an example, an included angle formed between the second push rod214and the third transmission rod23in the figure is 130°, an included angle formed between the second transmission rod22and the third transmission rod23is 70°, in the swing process of the second transmission rod22, the two included angles are gradually reduced, and the included angle between the second push rod214and the third transmission rod23is always greater than the included angle between the second transmission rod22and the third transmission rod23. Due to the larger included angle between the second push rod214and the third transmission rod23, a larger moment is generated when the first transmission rod21moves upwards, thereby improving the movement efficiency of the second transmission rod22.

Referring toFIGS.4to8, in another embodiment, an included angle between the second push rod214and the third transmission rod23is less than an included angle between the second transmission rod22and the third transmission rod23. In an example, the included angle formed between the second push rod214and the third transmission rod23is 90°, and the included angle formed between the second transmission rod22and the third transmission rod23is 110°. Since the included angle between the second transmission rod22and the third transmission rod23is larger, a lever force between the third transmission rod23and the second transmission rod22is increased when the first transmission rod21moves upwards, and then the pulling force effect of the third transmission rod23is improved, so that the entire movement is more stable.

Referring toFIGS.2to7, in an embodiment, the cleaning head3comprises a rotating base31and bristles32arranged on the rotating base31, the rotating base31is rotatably mounted in the mounting cavity11, the bristle32is arranged on one side of the rotating base31away from the mounting cavity11, the rotating base31is convexly provided with a mounting seat33, an avoidance groove333is formed in an eccentric position of the mounting seat33, and the first rotating groove331is formed on an inner wall of the avoidance groove333. The mounting seat33protrudes from one side of the rotating base31away from the bristles32, and a radius of the mounting seat33is less than that of the rotating base31. The purpose of the avoidance groove333formed at the eccentric position is to reserve enough space on the rotation track of the rotating base31to prevent the rotating base31and the second transmission rod22from structural interference in the movement process.

Referring toFIGS.4to10, in an embodiment, the electric toothbrush head100further comprises a limiting bolt7, the housing1is provided with a second fixed hole15, a side wall of the mounting seat33is provided with a limiting groove334, and the limiting bolt7extends into the limiting groove334from the second fixed hole15. Specifically, the limiting groove334is an arc-shaped groove formed along the movement track of the cleaning head3, and the limiting bolt7is perpendicular to the third limiting post6. In an example, an assembly process of the cleaning head3is provided, after the cleaning head3is mounted into the mounting cavity11from the mounting hole12and connected to the second transmission rod22, the limiting bolt7is inserted into the limiting groove334through the second fixed hole15, and the end portion of the limiting bolt is fixed in the second fixed hole15; in this case, an inner sidewall of the limiting groove334is limited by the limiting bolt7, so as to avoid shaking in a direction perpendicular to the rotation track, so that the assembly stability of the cleaning head3is improved, and the rotation stability of the cleaning head3is further improved.

Referring toFIGS.2to6, in an embodiment, the electric toothbrush head100further comprises a shock absorbing pad111, the shock absorbing pad111is arranged in the mounting cavity11, and a top of the shock absorbing pad111abuts against an outer wall of the second transmission rod22.

Specifically, since the second transmission rod22requires a certain moving space to normally swing, the second transmission rod is suspended in the mounting cavity11; however, since a certain space is reserved between the second transmission rod22and the inner wall of the mounting cavity11, when the second transmission rod22drives the cleaning head3to rotate along an arc-shaped track, the second transmission rod22can swing in a direction perpendicular to the rotation direction, which causes the cleaning head3to vibrate. The shock absorbing pad111is made of a flexible material, including but not limited to rubber and silica gel, which not only fills a space gap between the second transmission rod22and the mounting cavity11, but also avoids generating excessive interference on the movement of the second transmission rod22, thereby further playing a certain shock absorption role.

Further, the inner wall of the mounting cavity11is further provided with an accommodating groove113for accommodating the shock absorbing pad111. A shape and a size of the accommodating groove113are adapted to those of the shock absorbing pad111, which ensures that the shock absorbing pad111can be stably placed at the bottom of the mounting cavity11, and will not shift or fall off during use, thereby improving the stability of the cleaning head3.

Referring toFIGS.5to6, in an embodiment, a metal sleeve51is sleeved on the second limiting post5. In this embodiment, the second limiting post5is fixedly connected to the second transmission rod22, and one end of the second limiting post5away from the second transmission rod22is rotatably arranged in the first rotating groove331. The metal sleeve51is movably sleeved on the second limiting post5, and the transmission efficiency of force between the second limiting rod and the cleaning head3is improved through the engagement of the metal sleeve51and the first rotating groove331, so that the second limiting rod rotates in the first rotating groove331more smoothly.

Referring toFIGS.2to10, in an embodiment, the first transmission rod21is further provided with a connecting member8, one end of the first transmission rod21far away from the second transmission rod22is provided with a connecting seat215, and the connecting seat215is configured to mount the connecting member8.

Specifically, the connecting member8is configured to connect to a drive end of the drive mechanism200, so as to transmit the force of the drive mechanism200along an axial direction of the electric toothbrush head100to the transmission assembly2. When the drive mechanism200is driven by a motor, the connecting member8receives a pushing force from the drive mechanism200and transmits the pushing force to the transmission assembly2, which makes the transmission assembly reciprocate up and down, so that the cleaning head3is driven to rotate under the action of the transmission assembly2, and the cleaning effect is achieved.

Further, the connecting member8and the connecting base215may be connected by using a protrusion219and a groove83, a buckle position and a groove83, or other manners. In a preferred embodiment, the connecting base215is provided with a protrusion219, the protrusion219is provided with an annular buckle position, and the connecting member8is provided with a groove83engaged with the protrusion219; and through the flexibility of the connecting member8, the protrusion219is pushed into the groove83, and the buckle position is engaged with a limiting structure on a periphery of the groove83to achieve clamping.

Furthermore, the connecting member8is made of a flexible material and has good elasticity and deformability. When the connecting member8is impacted or vibrated by the drive mechanism200, the material of the connecting member can be elastically deformed to absorb and disperse energy from the vibration or the impact, so that the vibration transmitted to the connecting member8and the transmission assembly2connected to the connecting member is reduced, and the movement stability of the cleaning head3is further improved.

Referring toFIGS.2to8, in an embodiment, a spring216is sleeved on an outer side of the first transmission rod21, the mounting cavity11is provided with a spring seat112, and the spring216is positioned between the spring seat112and the connecting seat215. When the connecting member8receives the pushing force from the drive mechanism200, the first transmission rod21moves linearly in a direction of the cleaning head3, and the spring216is compressed in a direction of the spring seat112; and when the drive mechanism200stops providing power, the spring216releases the pressure to recover, and drives the first transmission rod21to move linearly in a direction away from the cleaning head3.

Referring toFIGS.2to8, in an embodiment, the connecting member8comprises a soft rubber suction disk82, and an end portion of a soft rubber ball disk81is provided with a suction disk portion connected to an end portion of a drive assembly. The soft rubber suction disk82is made of a flexible material including but not limited to rubber or silica gel, a surface of which has adsorption capacity, so that the soft rubber suction disk can be firmly attached to the smooth surface; and a connecting handle300is arranged at a drive end of the drive mechanism200, and the soft rubber suction disk82applies pressure to the bottom of the connecting member8, so that negative pressure is generated between the soft rubber suction disk and the surface, and stable fixing is achieved. In addition, since the soft rubber suction disk82is made of a flexible material, the soft rubber suction disk has good wear resistance and durability in the power transmission process, and can keep stable performance in long-term use.

Referring toFIGS.2to8, in an embodiment, the connecting member8comprises a soft rubber ball disk81, and an end portion of the soft rubber ball disk81is provided with an ellipsoid portion connected to an end portion of a drive assembly. The soft rubber ball disk81is of a hemispherical structure, which can provide flexible connection in multiple directions and is configured to connect the drive end of the drive mechanism200with an irregular or curved surface, and thus having strong adaptability and stability. In addition, an elastic force of the spring216abuts against the first transmission rod21, which ensures that tight connection is kept between the connecting member8and the drive end of the drive mechanism200, and prevents the unstable connection between the first transmission rod21and the drive mechanism200from affecting the transmission efficiency and uniformity of the force, thereby causing unstable rotation of the electric toothbrush head100.

Referring toFIGS.2to9, in an embodiment, the transmission assembly2further comprises a magnetic member9, the magnetic member9is fixedly arranged at one end of the first transmission rod21far away from the second transmission rod22, and the magnetic member9is magnetically attracted to a drive shaft of the electric toothbrush. The magnetic member9is configured to generate magnetic attraction with the drive end of the drive mechanism200and drive the transmission assembly2by magnetic force to achieve reciprocating linear motion. The drive mechanism200based on magnetic principle in the electric toothbrush is a mature technology in the field. Details are not described herein.

Referring toFIGS.2to9, in an embodiment, the magnetic member9is a screw, and the first transmission rod21is provided with a screw hole217adapted to the screw. The screw hole217is internally provided with an internal thread adapted to the screw, the magnetic member9is configured in the form of a screw, which ensures a stable mounting of the magnetic member9. Since the screw is a common fixing member, mounting and replacement are simpler, and assembly efficiency is improved.

Referring toFIGS.2to10, in an embodiment, one end of the housing1away from the cleaning head is provided with a tail hood13, an outer side of the housing1is provided with a bendable buckle14, and the tail hood13is provided with a clamping groove engaged and clamped with the buckle14.

Specifically, the tail hood13serves as a direct connection assembly between the housing1and the handle300, the tail hood13is provided with structures connected to the housing1and the handle300, and after the tail hood13is detachably mounted at the bottom of the housing1, and then through the direct connection structure between the tail hood13and the handle300, the housing1of the electric toothbrush head100is mounted on the electric toothbrush.

Further, the tail hood13is provided with an inserting portion with a diameter less than that of the mounting cavity11, and the inserting portion is arranged in the mounting cavity11in a penetrating manner to enable the tail hood13to be in butt joint with the housing1. In addition, an opened clamping groove is further formed in the tail hood13, the design of the buckle14and the clamping groove131enable the design of the housing1to have certain flexibility, in the pushing-in process, since the buckle14can be bent, the buckle14can be pressed up by an inner wall of the tail hood13until the buckle14moves to the clamping groove131, in this case, the tail hood13and the housing1are fixed through the clamping between the buckle14and the clamping groove131, when the tail hood13needs to be detached, the buckle14is pressed, and the tail hood13can be pulled out, so that the detaching and mounting are convenient.

Furthermore, mutually engaging connection structures are provided between the tail hood13and the handle300at the bottom of the electric toothbrush. Referring toFIG.11, in an example, the tail hood13is provided with a circular clamping hole132, and a circular clamping protrusion301protrudes from the handle300.

The above mentioned contents are only optional embodiments of the present invention and are not intended to limit the patent scope of the present invention, and under the inventive concept of the present invention, the equivalent structural transformations made by using the contents of the specification and the drawings of the present invention, or direct/indirect applications to other related technical fields, are all included in the patent protection scope of the present invention.