WO2017088113A1 - 用于电动清洁器具、可往复旋转的头部组件 - Google Patents

用于电动清洁器具、可往复旋转的头部组件 Download PDF

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Publication number
WO2017088113A1
WO2017088113A1 PCT/CN2015/095484 CN2015095484W WO2017088113A1 WO 2017088113 A1 WO2017088113 A1 WO 2017088113A1 CN 2015095484 W CN2015095484 W CN 2015095484W WO 2017088113 A1 WO2017088113 A1 WO 2017088113A1
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WO
WIPO (PCT)
Prior art keywords
head assembly
drive shaft
follower rod
axis
rotation
Prior art date
Application number
PCT/CN2015/095484
Other languages
English (en)
French (fr)
Inventor
戴晓国
徐振武
Original Assignee
上海携福电器有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海携福电器有限公司 filed Critical 上海携福电器有限公司
Priority to EP15909025.7A priority Critical patent/EP3381403B1/en
Priority to US15/779,075 priority patent/US10582990B2/en
Priority to PCT/CN2015/095484 priority patent/WO2017088113A1/zh
Priority to ES15909025T priority patent/ES2807254T3/es
Priority to JP2018527127A priority patent/JP6710757B2/ja
Publication of WO2017088113A1 publication Critical patent/WO2017088113A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/222—Brush body details, e.g. the shape thereof or connection to handle
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B5/00—Brush bodies; Handles integral with brushware
    • A46B5/0095—Removable or interchangeable brush heads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/225—Handles or details thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
    • A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
    • A61C17/3409—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor characterized by the movement of the brush body
    • A61C17/3418—Rotation around the axis of the toothbrush handle
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
    • A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor

Definitions

  • This invention relates to a reciprocating head assembly for an electric cleaning appliance, and more particularly to a reciprocating rotation of an electric cleaning appliance having a safety structure that prevents the head assembly from coming off the handle during operation of the cleaning appliance. Head component.
  • the torque of the drive shaft is often reliably transmitted to the head for cleaning by the interaction between the drive shaft and the coupling structure, and the torque transmission is maintained under load.
  • the interaction between the drive shaft and the coupling structure must also ensure that the head is held on the drive shaft during operation of the cleaning implement, and that the user can be easily driven from the head when the cleaning implement is not in operation. The shaft is removed.
  • the invention patent of the publication number CN101902986 B discloses a brush head/handle interface for an electric toothbrush, comprising: a brush head assembly having a brush member for cleaning teeth at one end thereof; a drive shaft from the toothbrush The handle portion extends and is driven to vibrate at a selected rotational angle, the drive shaft having one or more contact regions in which the interface surface is positioned, and a coupling member positioned at the brush head assembly
  • the other end has a body portion, wherein the coupling member includes one or more interface portions, the interface surface of the one or more interface portions and the drive shaft when the drive shaft is inserted into the coupling member a physical contact; and a spring member positioned to surround a portion of the body portion to apply a sufficient force to the body portion and the coupling member such that the one or more interface portions of the coupling member Physical contact with the one or more contact areas of the drive shaft sufficient to maintain the set of heads during operation of the toothbrush Actually held on the drive shaft, while allowing the user to remove the brushhead assembly from the driveshaft when
  • the head assembly has the advantages of small size, simple structure, long service life, and convenient assembly operation.
  • the reciprocating head assembly for an electric cleaning appliance is detachably coupled to a handle, and a drive shaft in the handle projects upwardly in a direction of its rotation axis and reciprocally rotates about its rotation axis, thereby driving
  • the head assembly reciprocally rotates about a rotational axis of the drive shaft, the head assembly including a cleaning element, a head assembly housing, a head assembly follower rod in a cavity of the hollow head assembly housing of the head assembly housing, the head assembly
  • the follower rod is provided with a head assembly follower shaft for accommodating the drive shaft, and at least one head assembly follower rod notch is provided in a region surrounding the hollow hollow body, so that the head assembly follower rod along the head
  • the radial direction of the cross-section of the hollow body of the component follower rod is elastic; at least one inner side groove of the head assembly outer casing is distributed on the inner side wall of the head assembly outer casing, and the inner side groove is configured to receive the head assembly from The corresponding head assembly on the moving rod protrudes
  • the head assembly follower rod notches may be distributed on the head assembly follower rod in a direction that is not perpendicular to the axis of rotation of the drive shaft.
  • the angle between the center line of the head member follower notch and the axis of rotation of the drive shaft is greater than -90 degrees and less than 90 degrees; or the angle is greater than -45 degrees and less than 45 degrees; or the angle is zero degrees.
  • the width of the head member follower rod notch is 0.3 mm to 2 mm, and preferably the width is 0.7 mm to 1.2 mm.
  • the head assembly follower rod projection is located below the top end of the head assembly follower rod notch in the direction of the axis of rotation of the drive shaft.
  • Two head assembly follower rod projections are symmetrically distributed on the head assembly follower rod along the head assembly housing axis, and the head assembly follower rod protrusion is located at the head assembly follower rod notch Driving the axis below the top of the axis of rotation, corresponding
  • the inner side groove of the head assembly housing may be disposed on the side wall of the inner cavity of the head assembly housing.
  • Two head assembly outer casing grooves are symmetrically distributed along the head assembly housing axis on the side wall of the head assembly housing.
  • the components of the head assembly are made of plastic.
  • the head assembly follower rod is distributed at the lower part with two lower end protruding head assembly follower rod elastic buckles, and the elastic buckle cooperates with the drive shaft annular groove provided on the drive shaft, so that the elastic buckle
  • the lower end projection may enter the drive shaft annular groove in whole or in part to constrain movement of the head assembly follower rod relative to the drive shaft in the direction of the axis of rotation of the handle drive shaft.
  • the drive shaft when the drive shaft is inserted into the head assembly follower rod, there is a one-sided interference amount of the head assembly follower rod and the drive shaft, and the head assembly follower rod protrusion formed by the head assembly follower rod notch
  • the elasticity and the fit of the inner side groove of the head assembly housing and the protrusion of the head assembly the drive shaft can push the head assembly from the moving rod protrusion deeper into the inner groove of the head assembly housing, so that the head
  • the inner groove of the component housing more reliably limits the movement of the head assembly follower rod projection along the axis of rotation of the drive shaft, thereby ensuring that the head assembly is driven when the drive shaft is inserted into the head assembly and begins to drive the head assembly for reciprocating rotational movement.
  • the rod is retained in the head assembly housing in a non-releasable manner, thereby effectively preventing the head assembly housing from escaping from the head assembly from the moving rod during movement to harm the user.
  • the driving shaft can move the head assembly from the moving rod protrusion in the direction of the groove deeper into the inner side of the head assembly housing, a first component of the head assembly of the head assembly follower rod and a second plane of the head assembly follower rod toward the first plane of the drive shaft on the drive shaft and the second plane of the drive shaft.
  • the movement fits more closely, thereby increasing the pressure and friction between the follower rod and the drive shaft of the head assembly. During the movement of the head assembly, this increased friction helps the head assembly follower to remain in stable engagement with the drive shaft, thereby preventing the head assembly from flying out of the drive shaft during motion and damaging the user. .
  • Figure 1 is a front elevational view of an electric cleaning appliance (e.g., an electric toothbrush) of the present invention
  • Figure 2 is a front elevational view of the handle of the electric cleaning appliance (such as an electric toothbrush) shown in Figure 1;
  • Figure 3 is a perspective view of the electric cleaning device shown in Figure 2 (such as an electric toothbrush) fixed to the drive shaft of the handle;
  • FIG. 4 is another perspective view of the electric cleaning device shown in FIG. 2 (such as an electric toothbrush) fixed to a drive shaft of the handle;
  • Figure 5 is a perspective view of the head assembly follower rod
  • Figure 6 is a bottom view of the follower rod of the head assembly shown in Figure 5;
  • Figure 7 is a bottom plan view of the combination of the head assembly housing and the cleaning elements
  • Figure 8 is a perspective view of the head assembly of the electric cleaning appliance (e.g., electric toothbrush) shown in Figure 1;
  • the electric cleaning appliance e.g., electric toothbrush
  • Figure 9 is a side elevational view of the head assembly of Figure 8.
  • Figure 10 is a schematic cross-sectional view of the head assembly housing taken along line A-A of Figure 9;
  • Figure 11 is a cross-sectional view of the head assembly of Figure 8 taken along line A-A of Figure 9;
  • Figure 12 is a combination view of the head assembly of Figure 8 taken along line B-B of Figure 9, including the entire head assembly follower rod and the entire drive shaft and a portion of the head assembly housing;
  • Figure 13 is a combination diagram of the head assembly follower rod and the handle drive shaft of Figure 8.
  • L 1 is the axis of rotation of the drive shaft
  • first, second, etc. are used to describe a plurality of elements or components, the elements or components are not limited by these words. These terms are only used to distinguish one element or component and another element or component, and do not include "order”. Therefore, the first element or component that is discussed below is referred to as a second element or component without departing from the spirit and scope of the invention.
  • an electric cleaning implement in an embodiment of the invention, includes a handle 1 that houses a drive portion therein and a head assembly 2 that is detachably coupled to the handle 1, a drive shaft that drives the head assembly 2 to rotate 11 (in FIG. 2 shows a portion thereof exposed, 3 and 4 shows the entire driveshaft) comprises a projecting portion of the handle 1 is exposed upward in a direction of its rotational axis L.
  • the head assembly 2 includes a cleaning element 21, a head assembly housing 22, and a head assembly follower rod 23 within the head assembly housing 22.
  • the drive shaft 11 is rotatable about the drive shaft axis of rotation L 1 reciprocal rotating motion so as to drive the head assembly 2
  • the reciprocating rotational motion about the rotational axis L 1 of the drive shaft is rotatable about the drive shaft axis of rotation L 1 reciprocal rotating motion so as to drive the head assembly 2
  • the reciprocating rotational motion about the rotational axis L 1 of the drive shaft is rotatable about the drive shaft axis of rotation L 1 reciprocal rotating motion so as to drive the head assembly 2
  • the reciprocating rotational motion about the rotational axis L 1 of the drive shaft.
  • a drive shaft annular groove 112 is distributed on the drive shaft 11, and the drive shaft annular groove 112 divides the drive shaft 11 into upper and lower portions, and the lower portion is fixedly coupled to the drive in the handle 1.
  • mechanism, thereby driving a shaft in the handle 11 may be driven about an actuator shaft reciprocally rotating the rotation axis L 1; a generally cylindrical body portion, wherein the cylinder presents a cylindrical region of the region of the drive shaft 113.
  • the upper portion is also distributed with a drive shaft first plane 111 and a drive shaft second plane 114 which are parallel to each other, that is, the upper portion is substantially a cylindrical body formed by cutting two mutually parallel planes.
  • the upper portion may also be a cone or a rectangular parallelepiped formed by cutting two mutually parallel planes, and the use of a cone or a rectangular parallelepiped does not exceed the scope of the present invention.
  • the head assembly follower rod 23 is distributed with a head assembly follower rod hollow body 239 for receiving the drive shaft 11. At least a head assembly follower rod notch 231 is distributed around the area of the head member of the head assembly follower rod.
  • the follower rod notch 231 causes the head assembly follower rod 23 to follow the head assembly follower rod hollow body.
  • 239 is radially elastic in cross section, and two elastic head assembly follower rod elastic buckles 232 are distributed under the head assembly follower rod 23, and the head assembly follower rod elastic buckles 232 are elastically Coupled to the drive shaft annular groove 112.
  • Two head assembly follower rod protrusions 233 are distributed on the outer side of the head assembly follower rod of the head assembly follower rod 23 near the head assembly follower rod elastic buckle 232, and the head assembly follower rod is convex
  • the lower portion 233 is located below the top end of the head assembly follower rod notch 231 in the direction of the drive shaft rotation axis L 1 ; the periphery of the hollow body 239 of the head assembly follower rod is distributed with the first axis 111 of the drive shaft.
  • the head assembly follower rod first plane 236; at the periphery of the head assembly follower hollow body 239 adjacent to the head assembly follower rod notch 231 are distributed two head assemblies that cooperate with the drive shaft second plane 114 a second plane 237 of the follower rod; a head assembly follower portion cylindrical cavity region 238 that is coupled to the drive shaft cylinder region 113 on the drive shaft 11 at a periphery of the hollow body 239 of the head assembly follower rod;
  • the head assembly follower rod 23 is distributed with a head assembly follower rod fixing portion 234 and a head assembly follower rod fixing portion recess 235.
  • the head assembly follower rod includes a portion of the cylindrical cavity region 238, it is apparent that a conical cavity region may be substituted for the cylindrical cavity region in this example, which is also within the scope of the present invention.
  • the drive shaft includes a partial cylindrical region 113, it is apparent that a cone region may be substituted for the cylindrical region in this example, which is also within the scope of the present invention.
  • a head assembly outer casing 22 is provided with a hollow head assembly housing interior 222 for receiving the head assembly follower rod 23.
  • a head assembly housing protrusion 223 is distributed in the upper portion of the head assembly housing inner cavity 222 for mechanical fastening with the head assembly follower rod fixing portion recess 235.
  • the head assembly housing 22 and the head assembly follower rod 23 are both plastic products, and the plastic products are suitable for mass industrial production and have good economy, but the mechanical fastening force between the plastic products is due to the plastic material.
  • the creep properties deteriorate with time, so that the mechanical fastening of simple plastic articles cannot be fixed to each other reliably and for a long time.
  • the head assembly housing inner groove 221 may be distributed on the side wall of the head assembly housing inner cavity 222, and the head assembly housing inner groove 221 is for receiving the corresponding head assembly follower rod protrusion.
  • Two head assembly follower rod projections 233 are symmetrically distributed on the head assembly follower rod 23 along the head assembly housing axis, and the head assembly follower rod projections 233 are located at the head assembly gap lever 231 downward along the drive shaft to the top of the axis of rotation of L 1, respectively, in the inside of the recess 221 of the head assembly housing 222 is provided on the housing interior side wall of the head assembly.
  • two head assembly outer casing inner grooves 221 are symmetrically distributed along the head assembly housing axis on the side wall of the head assembly housing inner cavity 222.
  • Two head assembly housing snap recesses 224 are disposed on the lower end side wall of the head assembly housing inner cavity 222 for receiving the head assembly follower lever spring clips 232.
  • Head assembly housing may be designed to snap-fit groove 224 is sufficient to allow the head assembly to the driven shaft 232 and an elastic snap-locking groove of the head assembly housing 224 along a non-interfering manner to the drive shaft perpendicular to the axis of rotation L 1 The direction of movement.
  • the head assembly 23 defines the driven shaft along the rotation axis L direction of the drive shaft having a head assembly driven shaft gap 231
  • head assembly 231 can be driven lever the head gap assembly 23 driven by the lever L 1 perpendicular to the drive shaft axis of rotation when external forces or force components in the direction of displacement of the drive shaft along the axis of rotation of L 1 perpendicular component force when the external force disappears or head assembly
  • the follower lever 23 can be restored to the state when the external force or component is not applied by the elasticity of the material itself.
  • This feature in the present specification is called a head assembly driven lever 23 has elasticity in the drive shaft 1 perpendicular to the axis of rotation L.
  • the head assembly 23 in the direction of the driven shaft axis of rotation perpendicular to the drive shaft of L 1 is provided with two driven head assembly bar protrusion 233, and the head assembly driven lever projection 233 is located the head assembly driven lever 231 along the drive shaft below the top of the notch on the axis of rotation of L 1, Similarly, since the head assembly driven lever 23 having a head assembly driven distribution bar gap 231, head assembly The follower lever projection 233 also has elasticity in a direction perpendicular to the rotational axis L 1 of the drive shaft.
  • the head assembly follower rod 23 can be elastic in a direction perpendicular to the rotation axis L 1 of the drive shaft and
  • the head assembly follower lever projection 233 has elasticity in a direction perpendicular to the rotational axis L 1 of the drive shaft.
  • the plurality of head assembly follower rod notches 231 also have the above features, as long as the bit line of the head assembly follower rod notch 231 is not perpendicular to the drive shaft rotation axis L 1 , the head assembly follower rod 23 can be realized.
  • a head assembly having a resilient projection follower lever 233 has elasticity in the direction perpendicular to the rotational axis of the drive shaft of L 1 the axis of rotation of L 1.
  • the respective median lines of the plurality of head assembly follower bars 231 may be parallel to each other or may be interlaced with each other. I will not repeat them here.
  • the head member follower bar notch 231 has a width of 0.3 mm to 2 mm, and the preferred head assembly follower bar notch 231 has a width of 0.7 mm to 1.2 mm.
  • the head assembly follower lever 23 is distributed at the lower portion with two head assembly follower lever spring clips 232 which cooperate with the drive shaft annular recess 112.
  • the projection disposed at the lower end of the head assembly follower lever spring clip 232 may fully or partially enter the drive shaft annular groove 112, thereby constraining the head assembly follower lever 23 relative to the drive shaft 11 along the handle drive shaft rotation axis L Movement in 1 direction.
  • the lower end of the head assembly follower rod 23 is a hollow head assembly follower rod hollow body 239, and the head assembly follower rod is in the cavity of the hollow body 239
  • the cross-sectional contour is roughly composed of a circular arc and two straight segments, that is, the head assembly follower hollow body 239 is substantially surrounded by a partial cylindrical side and two planes.
  • the head assembly follower rod hollow body 239 includes a head assembly follower rod first plane 236, a head assembly follower rod second plane 237, and a head assembly follower rod portion cylindrical cavity region 238.
  • the head assembly follower rod first plane 236 mates with the drive shaft first plane 111 to constrain the rotation of the head assembly follower rod 23 relative to the drive shaft 11.
  • the head assembly follower rod second plane 237 mates with the drive shaft second plane 114 to constrain the rotation of the head assembly follower rod 23 relative to the drive shaft 11.
  • the head assembly follower rod portion cylindrical cavity region 238 mates with the drive shaft cylinder region 113 on the drive shaft 11.
  • the drive shaft first plane 111 and the drive shaft second plane 114 are distributed at the upper end of the drive shaft 11, and the drive shaft first plane 111 and the drive shaft second plane 114 are parallel to each other, and the drive shaft first plane 111 or the drive shaft second plane 114 the width perpendicular to the axis of rotation of the drive shaft of L 1 is 40% to 100% of the drive shaft 113 corresponding to the region of the cylinder diameter.
  • the width in the direction of the drive shaft rotation axis L 1 is 50% of the diameter corresponding to the width on the drive shaft cylinder region 113.
  • the first plane with the drive shaft 111 of the head assembly with a first follower rod 236 in a plane perpendicular to the width direction of the axis of rotation on the drive shaft of L 1 slightly larger than or equal to a first driving shaft 111 is perpendicular to the plane of rotation of the drive shaft
  • the width in the direction of the axis L 1 , the width of the head assembly follower second plane 237 mated with the second plane 114 of the drive shaft in a direction perpendicular to the axis of rotation L 1 of the drive shaft is slightly greater than or equal to the second of the drive shaft plane 114 in the width direction of the axis of rotation of L 1 perpendicular to the drive shaft.
  • the geometry of the cylindrical cavity region 238 of the head member follower portion is smaller than the geometric dimension of the drive shaft cylinder region 113, and the head assembly follower portion of the cylindrical cavity region The diameter of 238 is smaller than the diameter of the drive shaft cylindrical region 113. More specifically, the head assembly follower rod portion cylindrical cavity region 238 and the drive shaft cylinder region 113 are of an interference fit.
  • two head assembly portion of the driven shaft relative to the cylindrical cavity region 238 symmetrically to the drive shaft axis of rotation L 1, two regions of the drive shaft 113 with respect to the cylinder axis L 1 of the drive shaft rotational symmetry.
  • the head assembly follower portion cylindrical cavity region 238 has a diameter that is 0.02 mm to 2 mm smaller than the diameter of the corresponding drive shaft cylinder region 113, i.e., the head assembly follower portion cylindrical cavity region 238 and the drive shaft cylinder body region 113 in the direction perpendicular to the drive shaft axis of rotation L of the amount of interference unilateral 0.01mm to 1mm.
  • the above-described unilateral interference amount is defined as the unilateral interference amount of the head member follower rod and the drive shaft.
  • the one-sided interference amount is 0.20 mm.
  • the present invention creatively provides at least one head assembly housing inner groove 221 on the head assembly housing 22, and at least one head assembly follower rod projection 233 on the head assembly follower rod 23, the head assembly is driven said head assembly bar protrusion driven lever notches 233,231 along the drive shaft below the top of the axis of rotation of L 1, the head assembly 221 are housed inside the housing recess a respective follower pin projection head assembly 233.
  • the drive shaft 11 is not inserted into the driven shaft 23 is a head assembly
  • the head assembly housing and the inside of the recess 221 between a head component driven lever projection 233 to the drive shaft is present in the vertical direction of the rotational axis L 1 Clearance 240.
  • the gap length of the drive shaft 240 perpendicular to the axis of rotation L 1 is greater than or equal to unilateral head assembly 23 and the drive shaft 11 between the driven lever interference amount.
  • the present invention in the inventive head assembly follower rod 23 to a non-vertical direction of the rotation axis L of the drive shaft 1 is distributed at least one head assembly 231 driven lever notch, the notch 231 in the bit line head assembly follower rod
  • the angle with the axis of rotation L 1 of the drive shaft is greater than -90 degrees and less than 90 degrees.
  • the angle between the center line of the head assembly follower notch 231 and the handle drive shaft rotation axis L 1 is greater than -45 degrees and less than 45 degrees, and more preferably, the head assembly is in the middle of the driven rod notch 231
  • the angle between the bit line and the axis of rotation L 1 of the drive shaft is zero degrees.
  • the respective median lines of the plurality of head assembly follower bars 231 may be parallel to each other or may be interlaced with each other.
  • the head assembly 231 of the head gap follower lever assembly driven lever 23 has elasticity in a vertical axis of rotation to the drive shaft of L 1, and a head assembly driven lever protrusion 233 is perpendicular to the rotation axis L of the drive shaft The direction of 1 is elastic.
  • the interference present in the direction perpendicular to the rotation axis L of the drive shaft according to the present invention, the cylindrical head portion of the driven lever assembly cavity region 238 and the drive shaft cylindrical region 113, the amount of interference of the interference unilateral Known as the head assembly follower rod and the handle drive shaft unilateral interference.
  • the head assembly follower rod and the drive shaft have a single side interference amount of 0.01 mm to 1 mm, and the head assembly follower rod notch 231 causes the head assembly follower rod protrusion 233 to be perpendicular to the drive shaft rotation axis L 1 Elastic, the head assembly outer side recess 221 receives the head assembly follower rod projection 233.
  • the head assembly housing 22 and the gap between the head assembly 23 on the follower rod 240 perpendicular to the longitudinal direction of the rotational axis L of the drive shaft 1 is greater than or equal to
  • the head assembly has a single-sided interference amount from the driven rod and the drive shaft.
  • the drive shaft 11 When the drive shaft 11 is inserted into the head assembly follower rod 23, there is a unilateral interference amount of the head assembly follower rod and the drive shaft, and the head assembly follower rod protrusion formed by the head assembly follower rod notch 231
  • the head assembly follower rod 23 When the reciprocating rotary motion is performed, the head assembly follower rod 23 is held in the head assembly housing 22 in a non-detachable manner, thereby effectively preventing the head assembly housing 22 from coming off the head assembly follower rod 23 during the movement and injuring the use.
  • the drive shaft first plane 111 and the drive shaft second plane 114 on the drive shaft 11 are moved or more closely engaged with each other, thereby increasing the between the head assembly follower rod 23 and the drive shaft 11 Pressure and friction. This increased friction during the movement of the head assembly helps the head assembly follower 23 to remain stably coupled to the drive shaft 11 at all times, thereby preventing the head assembly 2 from flying out of the drive shaft 11 during motion. And hurt the user.

Abstract

用于电动清洁器具、可往复旋转的头部组件（2），包括清洁元件（21）、头部组件外壳（22）、处于外壳（22）的中空头部组件外壳内腔（222）中的头部组件从动杆（23），从动杆（23）设有用于容纳驱动轴（11）的中空腔体（239），在围绕中空腔体（239）的区域中设有至少一个从动杆缺口（231），外壳内腔（222）侧壁上分布有至少一个外壳内侧凹槽（221），用以容纳设于从动杆（23）上的相应从动杆凸起（233），从动杆（23）还包括部分圆柱腔体区域或圆锥腔体区域（238），所述区域（238）的直径或该区域（238）相应结合部分的最大直径小于驱动轴（11）圆柱体区域（113）的直径，当驱动轴（11）未被插入头部组件从动杆（23）时，所述外壳内侧凹槽（221）和从动杆凸起（233）之间在垂直于驱动轴（11）旋转轴线方向（L1）上存在间隙（240），该间隙（240）在垂直于驱动轴（11）旋转轴线方向（L1）上的长度大于或等于头部组件从动杆（23）和驱动轴（11）之间的单边干涉量。

Description

用于电动清洁器具、可往复旋转的头部组件 技术领域
本发明涉及一种用于电动清洁器具、可往复旋转的头部组件，更具体地说，涉及一种具有安全结构、能防止清洁器具工作期间头部组件脱离手柄的电动清洁器具的可往复旋转的头部组件。
背景技术
在电动清洁器具中，往往借助驱动轴和联接结构之间的相互作用将驱动轴的转矩可靠地传递至用于清洁的头部，并且在负载下保持转矩传递。此外，驱动轴和联接结构之间的相互作用还必须保证既在清洁器具的运转过程中将头部保持在驱动轴上，又能在清洁器具不操作时允许使用者方便地将头部从驱动轴移除。
例如，授权公告号为CN101902986 B的发明专利公开了一种用于电动牙刷的刷头/手柄接口，包括：刷头组件，其一端具有用于清洁牙齿的刷子构件；驱动轴，其从牙刷的手柄部分延伸，并被驱动成经过选定的旋转角度振动，所述驱动轴具有一个或多个接触区域，接口表面定位在所述接触区域中；联接构件，其定位在所述刷头组件的另一端且具有主体部分，其中所述该联接构件包括一个或多个接口部分，当所述驱动轴插入所述联接构件时所述一个或多个接口部分与所述驱动轴的所述接口表面物理接触；以及弹簧构件，其定位为围绕所述主体部分的一部分，以对所述主体部分和所述联接构件施加足够大的力，以使得所述联接构件的所述一个或多个接口部分与所述驱动轴的所述一个或多个接触区域之间的物理接触足以在所述牙刷的操作过程中维持所述刷头组件在所述驱动轴上的实际保持，同时在所述牙刷不操作时允许使用者将所述刷头组件从所述驱动轴移除。
发明内容
本发明的目的是提供一种用于电动清洁器具、具有新颖的安全结构 的往复旋转的头部组件，该安全结构在器具工作期间可确保头部组件不与手柄脱离。此外，该头部组件还具有体积小、结构简单、使用寿命长、且装配操作方便的优点。
根据本发明的用于电动清洁器具、可往复旋转的头部组件与手柄可拆卸地联接，处于手柄内的驱动轴沿其旋转轴线方向向上伸出手柄，且绕其旋转轴线往复旋转，从而带动头部组件绕驱动轴旋转轴线往复旋转运动，头部组件包括清洁元件、头部组件外壳、处于头部组件外壳的中空头部组件外壳内腔中的头部组件从动杆，该头部组件从动杆设有用于容纳驱动轴的头部组件从动杆中空腔体，在围绕中空腔体的区域中设有至少一个头部组件从动杆缺口，致使头部组件从动杆沿头部组件从动杆中空腔体横截面的径向具有弹性；在头部组件外壳内腔侧壁上分布有至少一个头部组件外壳内侧凹槽，该内侧凹槽用以容纳设于头部组件从动杆上的相应头部组件从动杆凸起，致使头部组件外壳内侧凹槽约束头部组件从动杆凸起沿驱动轴旋转轴线方向的移动；头部组件从动杆还包括部分圆柱腔体或圆锥腔体区域，该圆柱腔体或圆锥腔体区域的直径或相应的结合部分的最大直径小于驱动轴圆柱体或圆锥体区域的直径或相应的结合部分的最大直径，二者为过盈配合；当驱动轴未被插入头部组件从动杆时，头部组件外壳内侧凹槽和头部组件从动杆凸起之间在垂直于驱动轴旋转轴线方向上存在间隙，该间隙在垂直于驱动轴旋转轴线方向上的长度大于或等于头部组件从动杆和驱动轴之间的单边干涉量，该单边干涉量可以为0.01mm至1mm，优选为0.20mm。
头部组件从动杆缺口可以沿非垂直于驱动轴旋转轴线的方向分布在头部组件从动杆上。优选头部组件从动杆缺口的中位线和驱动轴旋转轴线的夹角大于-90度且小于90度；或者该夹角大于-45度且小于45度；或者该夹角为零度。头部组件从动杆缺口的宽度为0.3mm-2mm，优选该宽度为0.7mm-1.2mm。
头部组件从动杆凸起位于所述头部组件从动杆缺口沿驱动轴旋转轴线的方向上的顶端的下方。头部组件从动杆上沿头部组件外壳轴线对称地分布有两个头部组件从动杆凸起，且所述头部组件从动杆凸起位于所述头部组件从动杆缺口沿驱动轴旋转轴线的方向上的顶端的下方，相应 地，头部组件外壳内侧凹槽可以设置在头部组件外壳内腔的侧壁上。在头部组件外壳内腔侧壁上沿头部组件外壳轴线对称地分布有两个头部组件外壳内侧凹槽。
所述头部组件的各部件都由塑料制成。
头部组件从动杆在下部分布有两个下端凸起的头部组件从动杆弹性卡扣，该弹性卡扣和设于驱动轴上的驱动轴环形凹槽配合，致使所述弹性卡扣下端的凸起可以全部或部分地进入驱动轴环形凹槽，从而约束头部组件从动杆相对于驱动轴沿手柄驱动轴旋转轴线方向上的运动。
利用本发明，当驱动轴插入头部组件从动杆时，由于存在头部组件从动杆和驱动轴单边干涉量，且由于头部组件从动杆缺口形成的头部组件从动杆凸起的弹性以及头部组件外壳内侧凹槽和头部组件从动杆凸起的配合，驱动轴可将头部组件从动杆凸起更深地推入头部组件外壳内侧凹槽，使头部组件外壳内侧凹槽更可靠地限制头部组件从动杆凸起沿驱动轴旋转轴线运动，从而确保在驱动轴插入头部组件、开始驱动头部组件作往复旋转运动时，头部组件从动杆不可脱离地保持在头部组件外壳中，从而有效防止头部组件外壳在运动期间脱离头部组件从动杆飞出而伤害使用者。
利用本发明，当驱动轴插入头部组件从动杆时，由于头部组件从动杆和驱动轴之间存在单边干涉量，且由于头部组件从动杆缺口形成的头部组件从动杆凸起的弹性以及头部组件外壳内侧凹槽和头部组件从动杆凸起的配合，驱动轴可以使头部组件从动杆凸起沿更深入头部组件外壳内侧凹槽方向运动，分布在头部组件从动杆上的头部组件从动杆第一平面和头部组件从动杆第二平面朝向与各自配合的位于驱动轴上的驱动轴第一平面和驱动轴第二平面运动或更紧密地贴合，从而加大了头部组件从动杆和驱动轴之间的压力和摩擦力。在头部组件运动过程中，这种增大了的摩擦力有助于头部组件从动杆始终保持和驱动轴稳定联接，从而防止头部组件在运动期间脱离驱动轴飞出而伤害使用者。
附图说明
图1为本发明的电动清洁器具(如电动牙刷)的正面图；
图2为图1所示的电动清洁器具(如电动牙刷)的手柄的正面图；
图3为图2所示的电动清洁器具(如电动牙刷)的固联于手柄的驱动轴的立体姿态视图；
图4为图2所示的电动清洁器具(如电动牙刷)的固联于手柄的驱动轴的另一立体姿态视图；
图5为头部组件从动杆的立体姿态视图；
图6为图5所示的头部组件从动杆仰视示意图；
图7为头部组件外壳和清洁元件组合的仰视示意图；
图8为图1所示的电动清洁器具(如电动牙刷)的头部组件的立体姿态视图；
图9为图8所示头部组件的侧视图；
图10为头部组件外壳沿图9中A-A方向剖切的示意图；
图11为图8所示头部组件沿图9中A-A方向剖切的示意图；
图12为图8所示头部组件沿图9中B-B方向剖切、包含整个头部组件从动杆和整个驱动轴以及部分头部组件外壳的组合示意图；
图13为图8所示头部组件从动杆和手柄驱动轴的组合示意图。
主要附图标记说明
1   为手柄
2   为头部组件
11  为驱动轴
12  为手柄外壳
13  为开关按钮
21  为清洁元件
22  为头部组件外壳
23  为头部组件从动杆
111 为驱动轴第一平面
112 为驱动轴环形凹槽
113 为驱动轴圆柱体区域
114 为驱动轴第二平面
221 为头部组件外壳内侧凹槽
222 为头部组件外壳内腔
223 为头部组件外壳凸起
224 为头部组件外壳卡扣凹槽
231 为头部组件从动杆缺口
232 为头部组件从动杆弹性卡扣
233 为头部组件从动杆凸起
234 为头部组件从动杆固定部分
235 为头部组件从动杆固定部分凹槽
236 为头部组件从动杆第一平面
237 为头部组件从动杆第二平面
238 头部组件从动杆部分圆柱腔体区域
239 为头部组件从动杆中空腔体
240 为头部组件外壳和头部组件从动杆间的间隙
L1  为驱动轴旋转轴线
具体实施方式
下文以电动牙刷的头部组件为例并结合附图更详细地描述本发明。虽然下面仅以电动牙刷为例进行解释说明，但本发明不限于此。显然，本发明也可用于其他电动清洁器具，例如电动洗脸刷等。
在本申请中采用了表述空间相对位置的术语如“内”、“外”、“上”、“下”、“上部(或上端)”、“下部(或下端)”等来简单描述如图所示的一个元件或特征与另一元件(一或多个)或特征(一或多个)的相互关系。在本说明书中，“内”和“外”是相对于电动清洁器具的径向而言的，邻近其中心定义为内，远离中心定义为外；“上”、“下”、“上部”、“下部”、“上端”、“下端”是相对于电动清洁器具的驱动轴旋转轴线而言的，当电动清洁器具处于直立或倾斜的工作状态时，邻近清洁元件端定义为“上”、“上部”、或“上端”，与其相反的一端定义为“下”、“下部”、或“下端”。
将元件描述为“在……上”或“联接到”另一元件时，其可以是直接位于或联接到另一元件上，或者可以存在居于其间的元件。而将元件描述为“直 接在……上”或“直接联接到”另一元件时，其间则没有元件存在。对于描述元件之间关系的其他词语应理解为具有类似的含义(例如“在……之间”与“直接在……之间”相对，等)。
尽管本申请中使用了词语第一、第二等来描述多个元件或构成部分，这些元件或构成部分不应受这些词语的限制。这些词语仅用于区分一个元件或构成部分和另一元件或构成部分，而不包含“顺序”。因此，将下面讨论的第一元件或构成部分称为第二元件或构成部分也没有超出本发明的构思和范围。
参照附图1-7，在本发明一实施例中，电动清洁器具包括内部容纳有驱动部分的手柄1和与手柄1可拆卸地联接的头部组件2，驱动头部组件2旋转的驱动轴11(图2中示出的是其外露部分，图3,4示出了整个驱动轴)包括沿其旋转轴线L1方向向上伸出手柄1的外露部分。头部组件2包括：清洁元件21、头部组件外壳22、处于头部组件外壳22内的头部组件从动杆23。通过头部组件从动杆23和驱动轴11的配合可将头部组件2可拆卸地安装在手柄1上，驱动轴11可绕驱动轴旋转轴线L1往复旋转运动，从而带动头部组件2绕驱动轴旋转轴线L1往复旋转运动。
参照图3-4，在驱动轴11上分布有驱动轴环形凹槽112，驱动轴环形凹槽112将驱动轴11分为上、下两部分，下部分可固定地联接于手柄1中的传动机构，从而驱动轴11可被手柄1中的传动机构驱动绕驱动轴旋转轴线L1往复旋转；上部分大体为圆柱体，呈现圆柱体特征的区域为驱动轴圆柱体区域113。上部分还分布有相互平行的驱动轴第一平面111和驱动轴第二平面114，也就是说，上部分大致为被切割出两个相互平行的平面后形成的圆柱形实体。显然，上部分也可以是被切割出两个相互平行的平面后形成的圆锥体或长方体等，采用圆锥体或长方体均未超出本发明的范围。
参照图5-6，头部组件从动杆23分布有头部组件从动杆中空腔体239，该中空腔体用来容纳驱动轴11。在围绕头部组件从动杆中空腔体239的区域至少分布有一个头部组件从动杆缺口231，从动杆缺口231使头部组件从动杆23沿头部组件从动杆中空腔体239横截面的径向具有弹性，在头部组件从动杆23下部分布有两个具有弹性的头部组件从动杆弹性卡扣232，这些头部组件从动杆弹性卡扣232可弹性地联接到驱动轴环形凹槽112。在头部组 件从动杆23的靠近头部组件从动杆弹性卡扣232的头部组件从动杆外侧上分布有两个头部组件从动杆凸起233，头部组件从动杆凸起233位于所述头部组件从动杆缺口231沿驱动轴旋转轴线L1的方向上的顶端的下方；在头部组件从动杆中空腔体239周边分布有和驱动轴第一平面111配合的头部组件从动杆第一平面236；在头部组件从动杆中空腔体239周边临近头部组件从动杆缺口231处分布有两个和驱动轴第二平面114配合的头部组件从动杆第二平面237；在头部组件从动杆中空腔体239周边分布有和驱动轴11上的驱动轴圆柱体区域113配合的头部组件从动杆部分圆柱腔体区域238；在头部组件从动杆23上部区域分布有头部组件从动杆固定部分234和头部组件从动杆固定部分凹槽235。虽然在本例中，头部组件从动杆包括部分圆柱腔体区域238，显然，也可用圆锥腔体区域代替本例中的圆柱腔体区域，这亦落入本发明的范围内。虽然在本例中，驱动轴包括部分圆柱体区域113，显然，也可用圆锥体区域代替本例中的圆柱体区域，这亦落入本发明的范围内。
参照图7-11，头部组件外壳22上分布有中空的头部组件外壳内腔222，头部组件外壳内腔222用来容纳头部组件从动杆23。头部组件外壳内腔222上部中分布有头部组件外壳凸起223，用以和头部组件从动杆固定部分凹槽235机械紧固。
本发明中，头部组件外壳22和头部组件从动杆23都为塑料制品，塑料制品适合于大批量工业生产以及具备良好的经济性，但塑料制品之间的机械紧固力由于塑料材料的蠕变特性会随时间的推移而变差，因而单纯的塑料制品的机械紧固不能可靠地、长时间地相互固定在一起。
为此，本发明中在头部组件外壳内腔222侧壁上可以分布有头部组件外壳内侧凹槽221，头部组件外壳内侧凹槽221用以容纳相应的头部组件从动杆凸起233，头部组件外壳内侧凹槽221约束头部组件从动杆凸起233沿驱动轴旋转轴线L1方向的移动，两者的联接通过凹槽221和凸起223的配合实现，因此，头部组件外壳内侧凹槽221对头部组件从动杆凸起233的约束不会随时间的推移而变差。在头部组件从动杆23上沿头部组件外壳轴线对称地分布有两个头部组件从动杆凸起233，且所述头部组件从动杆凸起233位于所述头部组件从动杆缺口231沿驱动轴旋转轴线L1的方向上的顶端的下方，相应地，在头部组件外壳内侧凹槽221设置在在头部组件外壳内腔222 侧壁上。优选在头部组件外壳内腔222侧壁上沿头部组件外壳轴线对称地分布有两个头部组件外壳内侧凹槽221。在头部组件外壳内腔222下端侧壁上分布有两个头部组件外壳卡扣凹槽224用以容纳头部组件从动杆弹性卡扣232。可将头部组件外壳卡扣凹槽224设计成足以允许头部组件从动杆弹性卡扣232以和头部组件外壳卡扣凹槽224无干涉的方式沿着垂直于驱动轴旋转轴线L1的方向运动。
参照图5、图13，本例中，在头部组件从动杆23沿驱动轴旋转轴线L1方向上开设有头部组件从动杆缺口231，头部组件从动杆缺口231可以使头部组件从动杆23在受到垂直于驱动轴旋转轴线L1方向的外力或分力时沿着垂直于驱动轴旋转轴线L1的方向产生位移，当上述外力或分力消失时，头部组件从动杆23可以依靠自身材料的弹性恢复到没有施加所述外力或分力时的状态。本说明书中将这种特性称之为头部组件从动杆23在垂直于驱动轴旋转轴线L1方向上具有弹性。如上所述，头部组件从动杆23在垂直于驱动轴旋转轴线L1的方向上设置有两个头部组件从动杆凸起233，且所述头部组件从动杆凸起233位于所述头部组件从动杆缺口231沿驱动轴旋转轴线L1的方向上的顶端的下方，同理，由于头部组件从动杆23分布有头部组件从动杆缺口231，头部组件从动杆凸起233在垂直于驱动轴旋转轴线L1的方向上也具有弹性。显然，只要头部组件从动杆缺口231的中位线不垂直于驱动轴旋转轴线L1，即可实现头部组件从动杆23在垂直于驱动轴旋转轴线L1的方向上具有弹性以及头部组件从动杆凸起233在垂直于驱动轴旋转轴线L1的方向上具有弹性。显然，多个头部组件从动杆缺口231也具有上述特征，只要头部组件从动杆缺口231中位线不垂直于驱动轴旋转轴线L1，即可实现头部组件从动杆23在垂直于驱动轴旋转轴线L1的方向上具有弹性以及头部组件从动杆凸起233在垂直于驱动轴旋转轴线L1的方向上具有弹性。所述多个头部组件从动杆缺口231各自的中位线可以相互平行也可以相互交错。在此不再赘述。
在本案中，所述头部组件从动杆缺口231的宽度为0.3mm-2mm,优选的头部组件从动杆缺口231的宽度为0.7mm-1.2mm。
参照图13，头部组件从动杆23在下部分布有两个头部组件从动杆弹性卡扣232，头部组件从动杆弹性卡扣232和驱动轴环形凹槽112配合。设置 在头部组件从动杆弹性卡扣232下端的凸起可以全部或部分地进入驱动轴环形凹槽112，从而约束头部组件从动杆23相对于驱动轴11沿手柄驱动轴旋转轴线L1方向上的运动。
参照图3、图4、图6，如上所述，头部组件从动杆23的下端为中空的头部组件从动杆中空腔体239，头部组件从动杆中空腔体239的腔体横截面轮廓线大致由圆弧和两段直线段组成，即头部组件从动杆中空腔体239大致为由部分圆柱体侧面和两个平面围绕而成。头部组件从动杆中空腔体239包括头部组件从动杆第一平面236、头部组件从动杆第二平面237和头部组件从动杆部分圆柱腔体区域238。头部组件从动杆第一平面236和驱动轴第一平面111配合，从而约束头部组件从动杆23相对于驱动轴11的旋转。头部组件从动杆第二平面237和驱动轴第二平面114配合，从而约束头部组件从动杆23相对驱动轴11的旋转。头部组件从动杆部分圆柱腔体区域238和驱动轴11上的驱动轴圆柱体区域113配合。驱动轴第一平面111和驱动轴第二平面114分布在驱动轴11的上端，驱动轴第一平面111和驱动轴第二平面114相互平行，驱动轴第一平面111或驱动轴第二平面114在垂直于驱动轴旋转轴线L1的方向上的宽度为驱动轴圆柱体区域113对应的直径的40％-100％。优选，驱动轴第一平面111在垂直于驱动轴旋转轴线L1的方向上的宽度为驱动轴圆柱体区域113上与该宽度处对应的直径的100％，驱动轴第二平面114在垂直于驱动轴旋转轴线L1的方向上的宽度为驱动轴圆柱体区域113上与该宽度处对应的直径的50％。优选与驱动轴第一平面111配合的头部组件从动杆第一平面236在垂直于驱动轴旋转轴线L1的方向上的宽度略大于或等于驱动轴第一平面111在垂直于驱动轴旋转轴线L1的方向上的宽度，与驱动轴第二平面114配合的头部组件从动杆第二平面237在垂直于驱动轴旋转轴线L1的方向上的宽度略大于或等于驱动轴第二平面114在垂直于驱动轴旋转轴线L1的方向上的宽度。
参照图3、图6、图12、图13，头部组件从动杆部分圆柱腔体区域238的几何尺寸小于驱动轴圆柱体区域113的几何尺寸，头部组件从动杆部分圆柱腔体区域238的直径小于驱动轴圆柱体区域113的直径。更具体地，头部组件从动杆部分圆柱腔体区域238和驱动轴圆柱体区域113属于过盈配合。本例中两个头部组件从动杆部分圆柱腔体区域238相对于驱动轴旋转轴线 L1对称分布，两个驱动轴圆柱体区域113相对于驱动轴旋转轴线L1对称分布。优选头部组件从动杆部分圆柱腔体区域238的直径比对应的驱动轴圆柱体区域113的直径小0.02mm至2mm，即，头部组件从动杆部分圆柱腔体区域238和驱动轴圆柱体区域113在垂直于驱动轴旋转轴线L1方向上单边干涉量为0.01mm至1mm。本说明书中，定义上述单边干涉量为头部组件从动杆和驱动轴的单边干涉量。优选地，所述单边干涉量为0.20mm。
本发明创造性地在头部组件外壳22上设置至少一个头部组件外壳内侧凹槽221，在头部组件从动杆23上设置至少一个头部组件从动杆凸起233，头部组件从动杆凸起233位于所述头部组件从动杆缺口231沿驱动轴旋转轴线L1的方向上的顶端的下方，头部组件外壳内侧凹槽221分别容纳相应的头部组件从动杆凸起233。显然，当驱动轴11未被插入头部组件从动杆23时，头部组件外壳内侧凹槽221和头部组件从动杆凸起233之间在垂直于驱动轴旋转轴线L1方向上存在间隙240。优选间隙240在垂直于驱动轴旋转轴线L1方向上的长度大于或等于头部组件从动杆23和驱动轴11之间的单边干涉量。
本发明创造性地在头部组件从动杆23上沿非垂直于驱动轴旋转轴线L1的方向分布有至少一个头部组件从动杆缺口231，头部组件从动杆缺口231的中位线和驱动轴旋转轴线L1的夹角大于-90度且小于90度。优选地，头部组件从动杆缺口231的中位线和手柄驱动轴旋转轴线L1的夹角大于-45度且小于45度，更为优选地，头部组件从动杆缺口231的中位线和驱动轴旋转轴线L1的夹角为零度。所述多个头部组件从动杆缺口231各自的中位线可以相互平行也可以相互交错。头部组件从动杆缺口231使头部组件从动杆23在垂直于驱动轴旋转轴线L1的方向上具有弹性，并使头部组件从动杆凸起233在垂直于驱动轴旋转轴线L1的方向上具有弹性。
综上所述，根据本发明，头部组件从动杆部分圆柱腔体区域238和驱动轴圆柱体区域113在垂直于驱动轴旋转轴线L1方向上存在干涉，所述干涉的单边干涉量被称为头部组件从动杆和手柄驱动轴单边干涉量。头部组件从动杆和驱动轴单边干涉量为0.01mm至1mm，而头部组件从动杆缺口231使头部组件从动杆凸起233在垂直于驱动轴旋转轴线L1的方向上具有弹性，头部组件外壳内侧凹槽221容纳头部组件从动杆凸起233。在驱动轴11未被 插入头部组件从动杆23时，头部组件外壳22和头部组件从动杆23之间的间隙240在垂直于驱动轴旋转轴线L1方向上的长度大于或等于头部组件从动杆和驱动轴单边干涉量。
当驱动轴11插入头部组件从动杆23时，由于存在头部组件从动杆和驱动轴单边干涉量，且由于头部组件从动杆缺口231形成的头部组件从动杆凸起233的弹性以及头部组件外壳内侧凹槽221和头部组件从动杆凸起233的配合，驱动轴11可将头部组件从动杆凸起233更深地推入头部组件外壳内侧凹槽221，使头部组件外壳内侧凹槽221更可靠地限制头部组件从动杆凸起233沿驱动轴旋转轴线L1运动，从而确保在驱动轴11插入头部组件2、开始驱动头部组件2作往复旋转运动时，头部组件从动杆23不可脱离地保持在头部组件外壳22中，从而有效防止头部组件外壳22在运动期间脱离头部组件从动杆23飞出而伤害使用者。
参照图3、4、6、12、13，当驱动轴11插入头部组件从动杆23时，由于头部组件从动杆23和驱动轴11之间存在单边干涉量，且由于头部组件从动杆缺口231形成的头部组件从动杆凸起233的弹性以及头部组件外壳内侧凹槽221和头部组件从动杆凸起233的配合，驱动轴11使头部组件从动杆凸起233沿更深入头部组件外壳内侧凹槽221方向运动，分布在头部组件从动杆23上的头部组件从动杆第一平面236和头部组件从动杆第二平面237朝向与各自配合的位于驱动轴11上的驱动轴第一平面111和驱动轴第二平面114运动或更紧密地贴合，从而加大了头部组件从动杆23和驱动轴11之间的压力和摩擦力。在头部组件运动过程中，这种增大了的摩擦力有助于头部组件从动杆23始终保持和驱动轴11稳定联接，从而防止头部组件2在运动期间脱离驱动轴11飞出而伤害使用者。

Claims (14)

  1. 一种用于电动清洁器具、可往复旋转的头部组件(2)，其与手柄(1)可拆卸地联接，处于手柄(1)内的驱动轴(11)沿其旋转轴线(L1)方向向上伸出手柄(1)，且绕其旋转轴线(L1)往复旋转，从而带动头部组件(2)绕驱动轴旋转轴线(L1)往复旋转运动，
    其中，所述头部组件(2)包括清洁元件(21)、头部组件外壳(22)、处于头部组件外壳(22)的中空头部组件外壳内腔(222)中的头部组件从动杆(23)，该头部组件从动杆(23)设有用于容纳驱动轴(11)的头部组件从动杆中空腔体(239)，在围绕所述中空腔体(239)的区域中设有至少一个头部组件从动杆缺口(231)，致使头部组件从动杆(23)沿头部组件从动杆中空腔体(239)横截面的径向具有弹性；在所述头部组件外壳内腔(222)侧壁上分布有至少一个头部组件外壳内侧凹槽(221)，该内侧凹槽(221)用以容纳设于头部组件从动杆(23)上的相应头部组件从动杆凸起(233)，致使头部组件外壳内侧凹槽(221)约束头部组件从动杆凸起(233)沿驱动轴旋转轴线(L1)方向的移动；所述头部组件从动杆(23)还包括部分圆柱腔体或圆锥腔体区域(238)，该圆柱腔体或圆锥腔体区域(238)的直径或相应的结合部分的最大直径小于驱动轴圆柱体或圆锥体区域(113)的直径或相应的结合部分的最大直径，二者为过盈配合；当驱动轴(11)未被插入头部组件从动杆(23)时，头部组件外壳内侧凹槽(221)和头部组件从动杆凸起(233)之间在垂直于驱动轴旋转轴线(L1)方向上存在间隙(240)，该间隙(240)在垂直于驱动轴旋转轴线(L1)方向上的长度大于或等于头部组件从动杆(23)和驱动轴(11)之间的单边干涉量。
  2. 如权利要求1所述的头部组件(2)，其中，所述头部组件从动杆缺口(231)沿非垂直于驱动轴旋转轴线(L1)的方向分布在头部组件从动杆(23)上。
  3. 如权利要求2所述的头部组件(2)，其中，所述头部组件从动杆缺口(231)的中位线和驱动轴旋转轴线(L1)的夹角大于-90度且小于90度。
  4. 如权利要求3所述的头部组件(2)，其中，所述头部组件从动杆缺口(231)的中位线和驱动轴旋转轴线(L1)的夹角大于-45度且小于45度。
  5. 如权利要求4所述的头部组件(2)，其中，所述头部组件从动杆缺 口(231)的中位线和驱动轴旋转轴线(L1)的夹角为零度。
  6. 如权利要求1或2所述的头部组件(2)，其中，所述头部组件外壳内侧凹槽(221)设置在头部组件外壳内腔(222)的侧壁上。
  7. 如权利要求1或2所述的头部组件(2)，其中，头部组件从动杆凸起(233)位于所述头部组件从动杆缺口(231)沿驱动轴旋转轴线(L1)的方向上的顶端的下方。
  8. 如权利要求1或2或7所述的头部组件(2)，其中，头部组件从动杆(23)上沿头部组件外壳轴线对称地分布有两个头部组件从动杆凸起(233)，且所述头部组件从动杆凸起(233)位于所述头部组件从动杆缺口(231)沿驱动轴旋转轴线(L1)的方向上的顶端的下方，相应地，在所述头部组件外壳内腔(222)侧壁上沿头部组件外壳轴线对称地分布有两个头部组件外壳内侧凹槽(221)。
  9. 如权利要求1或2所述的头部组件(2)，其中，所述单边干涉量为0.01mm至1mm。
  10. 如权利要求9所述的头部组件(2)，其中，所述单边干涉量为0.20mm。
  11. 如权利要求1至5中任一项所述的头部组件(2)，其中，所述头部组件从动杆缺口(231)的宽度为0.3mm-2mm。
  12. 如权利要求11所述的头部组件(2)，其中，所述头部组件从动杆缺口(231)的宽度为0.7mm-1.2mm。
  13. 如权利要求1或2所述的头部组件(2)，其中，所述头部组件(2)的各部件都由塑料制成。
  14. 如权利要求1或2所述的头部组件(2)，其中，所述头部组件从动杆(23)在下部分布有两个下端凸起的头部组件从动杆弹性卡扣(232)，该弹性卡扣(232)和设于驱动轴(11)上的驱动轴环形凹槽(112)配合，致使所述弹性卡扣(232)下端的凸起可以全部或部分地进入驱动轴环形凹槽(112)，从而约束头部组件从动杆(23)相对于驱动轴(11)沿手柄驱动轴旋转轴线(L1)方向上的运动。
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