Patent Publication Number: US-2023140465-A1

Title: Removable brush head

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is related to U.S. application Ser. No. 16/822,935 titled “Brush Head for Oral Cleansing Device,” filed on Mar. 18, 2020, which is incorporated by reference herein for all purposes. 
    
    
     TECHNICAL FIELD 
     One or more embodiments of the present disclosure relate generally to oral cleansing devices and more particularly, for example, to systems and methods for a removable brush head of an oral cleansing device. 
     BACKGROUND 
     Electric toothbrushes and/or combination units that provide a toothbrush function along with an irrigating function sometimes include a cleaning attachment removably connected to a drive system. The connection between the cleaning attachment and the drive system can break or wear out, such as due to repeated attachment and removal of the cleaning attachment to and from the drive system. This breakdown or wearing out of the connection between the cleaning attachment and the drive system may cause performance degradation over time. For example, the connection may lose its friction fit tolerances, leading to inefficient transfer of rotational motion of the drive system to the brush head. Additionally, many coupling features may require multiple components, which increase the cost and complexity of manufacturing of the cleaning attachment. 
     Therefore, there is a need in the art for systems and methods for a removable brush head or other accessory for an oral cleansing device that addresses the deficiencies noted above, other deficiencies known in the industry, or at least offers an alternative to current techniques. 
     SUMMARY 
     According to one embodiment, a brush head for an oral cleansing device is disclosed. The brush head may include a brush body defining a shaft cavity, one or more contact pads coupled to the brush body and extending at least partially into the shaft cavity, and a biasing arm coupled to the brush body and extending at least partially into the shaft cavity, where the biasing arm exerts a biasing force towards the one or more contact pads. 
     According to one embodiment, an accessory for an oral cleansing device is disclosed. The accessory includes a brush body defining a shaft cavity and an attachment assembly positioned within the shaft cavity and configured to selectively couple to a shaft received within the shaft cavity and transfer motion from the shaft to the brush body. The attachment assembly includes a contact pad and a biasing arm partially extending into the shaft cavity, where the biasing arm exerts a biasing force in a direction towards the contact pad. 
     Additional features are set forth in part in the description that follows and will become apparent to those skilled in the art upon examination of the specification and drawings or may be learned by the practice of the disclosed subject matter. A further understanding of the nature and advantages of the present disclosure may be realized by reference to the remaining portions of the specification and the drawings, which forms a part of this disclosure. 
     One of skill in the art will understand that each of the various aspects and features of the disclosure may advantageously be used separately in some instances, or in combination with other aspects and features of the disclosure in other instances. Accordingly, individual aspects can be claimed separately or in combination with other aspects and features. Thus, the present disclosure is merely exemplary in nature and is in no way intended to limit the claimed invention or its applications or uses. It is to be understood that structural and/or logical changes may be made without departing from the spirit and scope of the present disclosure. 
     The present disclosure is set forth in various levels of detail and no limitation as to the scope of the claimed subject matter is intended by either the inclusion or non-inclusion of elements, components, or the like in this summary. In certain instances, details that are not necessary for an understanding of the disclosure or that render other details difficult to perceive may have been omitted. Moreover, for the purposes of clarity, detailed descriptions of certain features will not be discussed when they would be apparent to those with skill in the art so as not to obscure the description of the present disclosure. The claimed subject matter is not necessarily limited to the arrangements illustrated herein, with the scope of the present disclosure is defined only by the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The description will be more fully understood with reference to the following figures in which components may not be drawn to scale, which are presented as various embodiments of the brush head or oral cleansing accessory described herein and should not be construed as a complete depiction of the scope of the brush head or cleansing accessory. 
         FIG.  1    is an isometric, partially exploded view of an oral cleansing device in accordance with an embodiment of the disclosure. 
         FIG.  2 A  is a rear elevation view of a brush head in accordance with an embodiment of the disclosure. 
         FIG.  2 B  is an exploded view of the brush head of  FIG.  2 A  in accordance with an embodiment of the disclosure. 
         FIG.  3 A  is a front isometric view of a retainer in accordance with an embodiment of the disclosure. 
         FIG.  3 B  is a cross-section view of a retainer taken along line  3 B- 3 B in  FIG.  3 A  in accordance with an embodiment of the disclosure. 
         FIG.  4 A  is a rear isometric view of a biasing collar in accordance with an embodiment of the disclosure. 
         FIG.  4 B  is a is a cross-section view of a biasing collar taken along line  4 B- 4 B in  FIG.  4 A  in accordance with an embodiment of the disclosure. 
         FIG.  4 C  is a rear elevation view of a biasing collar in accordance with an embedment of the disclosure. 
         FIG.  5 A  is a cross-section view of a brush head coupled to a drive shaft in accordance with an embodiment of the disclosure. 
         FIG.  5 B  is an enlarged view of the cross-section of  FIG.  5 A  in accordance with an embodiment of the disclosure. 
     
    
    
     Embodiments of the invention and their advantages are best understood by referring to the detailed description that follows. It should be appreciated that like reference numerals are used to identify like elements illustrated in one or more of the figures. 
     DETAILED DESCRIPTION 
     According to the present disclosure, a brush head is provided that improves a coupling between a drive shaft and the brush head. The brush head may also act to maintain the tightness of the coupling as components wear over time and/or experience external forces, such as a brushing force applied to the brush head by a user. The brush head may include a retainer or brush retention feature including an engagement arm, such as a cantilevered beam, that flexes to engage both with an outer surface of the drive shaft and an interior surface of the brush head. The engagement arm may be loaded when engaged with the drive shaft to help ensure a tight connection and transfer motion between the drive shaft and the brush head, e.g., allow the drive shaft to move the brush head, such as in an oscillating motion. In some implementations, the engagement arm may be configured to transition from a cantilevered beam as the drive shaft is inserted, e.g., including a single supported end, into a simply supported beam, with two supported ends. This may help to increase the force generated by the engagement arm, without requiring an increased form factor. 
     Optionally, the retainer may include a keyed or anti-clocking surface or element on an interior thereof. The keyed surface may engage with a corresponding keyed surface or feature on the drive shaft, such as a flat or recessed surface on the drive shaft, to prevent relative motion between the brush head and the drive shaft (e.g., ensure that the drive shaft does not oscillate within the brush head, but rather acts to oscillate the brush head itself). The keyed surface may also act to clock the brush head and drive shaft together, ensuring that they oscillate or move together at the same rotational rate. In some embodiments, the retainer may be formed as a unitary or integral component, helping to reduce manufacturing cost and increase ease of assembly as compared to conventional retaining features for oral cleansing devices. 
     The brush head may include a biasing collar that acts to ensure a tight fit between the drive shaft and an internal surface of the brush head. The biasing collar may include a biasing arm, such as an integrated biasing arm, which may be in the form of a cantilevered beam, that biases the drive shaft against one or more contact pads. The biasing force helps to ensure that the drive shaft is engaged or pressed against the one or more contact pads (either in the biasing collar or within the brush head) to help ensure a tight fit between the brush head and the drive shaft. The biasing force compensates for reduced thickness or wear between the components, e.g., worn down contact pads. In conventional brush heads, as components wear over time the coupling between the drive shaft and the brush head may begin to feel loose or “wobbly,” which may reduce the motion transfer to the brush head by the drive shaft, as well as create a poor user experience while using the oral cleansing device. The biasing collar helps to counteract wear between components and ensure a tight fit, even as components wear over time. Additionally, in some embodiments, the biasing arm may be configured to transition from a cantilevered beam to a simply supported beam as the drive shaft engages the biasing collar. This transition allows the force generated by the biasing arm to be increase as compared to conventional retaining structures, while allowing a small or reduced form factor. 
       FIG.  1    illustrate an isometric, partially exploded view of an oral cleansing device  100  in accordance with an embodiment of the disclosure. The oral cleansing device  100  may include many configurations. For example, the oral cleansing device  100  may be in the form of a handheld device and include a handle  102  and a brush head  104 . Depending on the application, the oral cleansing device  100  may be a toothbrush, an oral irrigator, a combination of a toothbrush and an oral irrigator, or any other handheld device designed for oral care. For example, in the embodiment illustrated in  FIG.  1   , the oral cleansing device  100  includes a brushing function. In other embodiments, however, the oral cleansing device  100  may be a combination brushing/irrigating device, a handheld oral irrigator, or other device with a cleaning attachment. In such embodiments, “brush head” may refer to any cleaning attachment that is securable to the handle  102  without intent to limit. 
     The handle  102  may include many configurations. For example, the handle  102  may be defined by a housing  110  that extends between a base end  112  and a brush end  114 . The housing  110  may be generally cylindrical in shape to ergonomically fit in the hand of a user, although the housing  110  may be formed in any other desirable ergonomic shape. In some embodiments, the cylindrical shape of the housing  110  may taper in the direction of the brush end  114  to define a smooth transition or taper to the brush head  104 . The base end  112  of the housing  110  may be generally flat such that the handle  102  may be stood upright on a level surface. 
     As shown, the handle  102  may include a drive shaft  120  extending from the brush end  114  of the housing  110  to drive operation of the brush head  104 . For example, the drive shaft  120  may oscillate to cause corresponding oscillation of the brush head  104 , as detailed more fully below. In such embodiments, the oral cleansing device  100  may include a power train assembly coupled to the drive shaft  120 . The power train assembly may include many configurations operable to oscillate the drive shaft  120  and the brush head  104  connected thereto. An example of a power train assembly that may drive the drive shaft  120  is shown and described in U.S. Pat. No. 10,449,023 entitled “Oral Cleansing Device with Energy Conservation,” which is incorporated herein in its entirety for all purposes. 
     The drive shaft  120  may include one or more features facilitating attachment of the brush head  104  to the drive shaft  120 . For example, the drive shaft  120  may include a tip  122  with a keyed feature  124 , such as a flat defined thereon. In such embodiments, the tip  122  may include a non-circular cross-sectional shape that mates, at least partially, with a correspondingly-shaped structure of the brush head  104  to rotationally couple the brush head  104  to the drive shaft  120 , as explained below. The drive shaft  120  may include a base  128  having a circular or substantially circular cross-section. In such embodiments, a shoulder  130  may be defined at a transition between the non-circular cross-sectional shape of the tip  122  and the circular cross-sectional shape of the base  128 . A shaft retention feature  131  may be defined as a lip on an outer surface of the drive shaft  120  and may be positioned on an opposite side of the drive shaft  120  from the keyed feature  124  or flat and in some embodiments may be positioned between the tip  122  and the shoulder  130  of the drive shaft  120 , such as in a middle portion of the keyed feature  124 . 
       FIG.  2 A  illustrates a rear elevation view of the brush head  104  in accordance with an embodiment of the disclosure.  FIG.  2 B  illustrates an exploded view of the brush head  104  in accordance with an embodiment of the disclosure. The brush head  104  may include the brush body  150  that may include a shaft portion  157  and a head portion  158  extending from one end thereof. The head portion  158  may define a bristle support or bristle base to which the cleaning elements  152 , such as the bristles  154 , may be coupled. A trim recess  155  may defined towards an end of the brush body  150 , such as a bottom end opposite of the brush head  104 . The trim recess  155  may be configured to receive a trim ring  118  thereon, which may be used as an identifier to correspond the brush head  104  to a particular user (e.g., different colored trim rings  118  may identify brush heads  104  belonging to different users). For example the trim recess  155  may define one or more recesses or apertures into which one or more detents on the interior surface of the trim ring  118  may seat to secure the trim ring  118  to the brush head  104 . 
     The brush head  104  may also define an opening  166  at the bottom end where the opening  166  may define an entrance to a shaft cavity  156 . The shaft cavity  156  may define a hollow or partially hollow cavity within the shaft portion  157  of the brush body  150 . In shaft cavity  156  is configured to receive the drive shaft  120  of the handle  102  and in embodiments where the handle  102  may include an irrigating function may also include a fluid pathway or define a fluid pathway to fluidly couple a pump to the nozzle. 
     With reference to  FIG.  2 B , an attachment assembly  160  may be configured to be received within the shaft cavity  156  of the brush head  104 . The attachment assembly  160  selectively secures the brush head  104  to the drive shaft  120  and enables the transfer of motion between the drive shaft  120  and the brush head  104 , while reducing relative motion between the two. 
       FIG.  3 A and  3 B  illustrate views of a retainer  162  for the attachment assembly  160 . The retainer  162  may be configure to couple the drive shaft  120  to the brush body  150  and transfer motion from the drive shaft  120  to the brush body  150 . The retainer  162  may be defined as a general tubular body having a first end  176  and a second end  178 , with a shaft passage  172  extending between the two ends  176 ,  178 , where the shaft passage  172  is defined by an interior surface  174  or wall. The first end  176  may include an annular flange that extends about the outer surface of the retainer  162  and may be used to assist in securing the retainer  162  to the brush body  150 . Similarly, the second end  178  may also define a flange or collar portion to assist in securing the retainer  162  within the brush body  150 . The second end  178  may also include a keyed end  180 , which may define a shoulder or tab extending radially outwards from the outer surface of the retainer  162 . The keyed end  180  may also include a recessed surface on the terminal end thereof. 
     An engagement arm  170  may be defined on or coupled to the retainer  162 . In many embodiments, the engagement arm  170  may be formed integrally with the retainer  162 , reducing the number of components for the attachment assembly  160 , reducing manufacturing cost and enabling ease of assembly. The engagement arm  170  may have an attached end  188  and a free end  190  so as to form a cantilevered and flexible beam. In one embodiment, the attached end  188  may be adjacent the first end  176  of the retainer and the free end  190  be adjacent to the second end  178  of the retainer  162 , but in other configurations may be differently orientated. The engagement arm  170  may include a curvature along its length. In one example, the engagement arm  170  may include a dip or concave portion between the attached end  188  and the free end  190 . Additionally, in some embodiments, a thickness of the engagement arm  170  may taper in the longitudinal direction, such that the attached end  188  may have a larger thickness than the free end  190 , which may allow the engagement arm  170  to have an increased flexibility. 
     The engagement arm  170  is flexible and configured to exert a biasing or spring force to assist in securing the drive shaft  120  to the retainer  162  and the retainer  162  to the brush body  150  as discussed in more detail below. Further, a load may be distributed along the length of the engagement arm  170 , which may help to prevent the engagement arm  170  from experiencing a failure (e.g., breaking) as the brush head  104  is inserted and removed from the drive shaft  120 . 
     A retention feature  182  may be formed on an interior surface of the engagement arm  170 , e.g., on an surface facing towards the shaft passage  172 . The retention feature  182  may be formed as a raised or protruding surface feature and optionally may be oriented at location corresponding to the dip or concave portion of the engagement arm  170 . In one example, the retention feature  182  may be defined as a flat surface on the bottom engagement arm  170 . In this manner, the retention feature  182  may be located an interior most location for the engagement arm  170 , e.g., a location positioned most closely to a center axis of the retainer  162 . 
     With continued reference to  FIGS.  3 A and  3 B , a keyed surface  184 , which may be defined as a shaft keyed or flat surface, may be formed on an interior of the retainer  162 , e.g., defined on an interior wall  174  of the retainer  162 . The keyed surface  184  may be defined as a raised or protruding surface that extends into the shaft passage  172 . In one example, the keyed surface  184  may include a beveled front edge  192  that transitions the interior wall  174  into the keyed surface  184 . The shape and dimensions of the keyed surface  184  are configured to correspond to a corresponding keyed feature  124  on the drive shaft  120  and so may be varied to define a “fit” or coupling between the two components. The keyed surface  184  is configured to couple to the drive shaft  120  and prevent rotation of the drive shaft  120  relative to the retainer  162 , e.g., ensure that all motion of the drive shaft  120  is transmitted to the retainer  162 . 
       FIGS.  4 A- 4 C  illustrate various views of a biasing collar  164  that may form part of the attachment assembly  160 . The biasing collar  164  is configured to exert a biasing coupling force on the drive shaft  120  to help retain the drive shaft  120  within the brush body  150  and maintain a tight connection, e.g., prevent a “wobble” or other relative movement between the brush body  150  and the drive shaft  120 . The biasing collar  164  may be formed to include a hollow passageway, e.g., a shaft passageway  202  that extends between a first end  204  and a second end  206  of the biasing collar  164 . A seating surface  208  or shelf may be inset from the first end  204  and define a seating surface to receive a component, such as a seal or mechanical coupling to secure the handle  102  to the brush body  150 . 
     The first end  204  and second end  206  may include one or more alignment and/or securing features  218 ,  220 , such as tabs, that may be defined as raised protrusions that extend about the outer surface of the biasing collar  164 . The first end  204  and second end  206  may also define flanged portions that have a wider diameter than the intermediate sections of the biasing collar  164 , which may act to assist in anchoring the biasing collar  164  within the brush body  150 . 
     One or more contact pads  216   a ,  216   b  may be defined as raised protrusions on the interior surface  218  of the biasing collar  164 . In one embodiment, there may be two contact pads  216   a ,  216   b  that may be positioned on opposite sides of a center axis of the biasing collar  164  one another, but in other embodiments, there may be fewer (e.g., one) or more (e.g., four) contact pads  216   a ,  216   b . Similarly, although the contact pads  216   a ,  216   b  are shown as being positioned on the biasing collar  164 , in other embodiments, the contact pads  216   a ,  216   b  may be formed within the brush body  150 , such as within an interior surface of the brush body  150  defining the shaft cavity  156 . 
     A biasing arm  200  may be defined a spring or flexible arm including an attached end  212  and a free end  214 , where the biasing arm  200  has a longitudinal length extending parallel to a center axis C A  of the biasing collar  164 . In one example, the attached end  212  may be positioned adjacent the first end  204  and the free end  214  may be positioned adjacent the second end  206 , but in other embodiments may be differently configured (e.g., oriented in an opposite manner). The biasing arm  200  may have a concave curvature that curves inwardly towards the center axis C A  of the biasing collar  164  along a length of the biasing arm  200 . This curvature may bias the biasing arm  200  towards the center axis of the biasing collar  164 . The biasing arm  200  may be configured to be biased towards the shaft passage  202 , which as described below, may assist in exerting a force on the drive shaft  120  to assist in engaging the drive shaft  120  with the contact pads  216   a ,  216   b.    
     A coupling surface  210  or coupling pad may be defined on a bottom or interior surface of the biasing arm  200 . In one example, the coupling surface  210  is defined as a flat surface on the interior curve surface of the biasing arm  200  and may correspond to a bottom most surface of the biasing arm  200 , e.g., the portion of the biasing arm  200  positioned closest to the center axis C A  of the biasing collar  164 . In some embodiments, the coupling surface  210  may function as a contact pad and define a flexible point of contact on the drive shaft  120  as discussed in more detail below. 
     The attachment assembly  160  may be positioned within the brush head  104 . For example, the retainer  162  may be inserted through the opening  166  of the brush body  150  and into the shaft cavity  156 . The second end  178  may be inserted first such that the keyed end  180  engages against an interior wall within the shaft cavity  156  of the brush body  150  and the first end  176  is oriented to face towards the bottom end of the brush body  150  (e.g., towards opening  166 ). The biasing collar  164  may be positioned within the brush head  104 , such as positioned within the shaft cavity  156  adjacent to the retainer  162  and positioned between the retainer  162  and the opening  166  of the brush body  150 . For example, the second end  206  of the biasing collar  164  may abut against the first end  176  of the retainer  162 . The shaft passage  202  of the biasing collar  164  may align with the shaft passage  172  in the retainer  162 , allowing the drive shaft  120  to extend through each of the biasing collar  164  and retainer  162 . Optionally, the alignment features  218 ,  220  of the biasing collar  164  may be aligned with corresponding features, e.g., grooves or adjacent other ribs, to align and retain the biasing collar  164  within the cavity  156  of the brush body  150 . Once positioned, the first end  204  of the biasing collar  164  may be aligned with and flush with the bottom end of the brush body  150 . In some embodiments, both the retainer  162  and the biasing collar  164  may engage with the interior surfaces of the brush body  150  defining the shaft cavity  156 , which will act to prevent relative rotation between the brush body  150  and the attachment assembly  160 . 
     With reference to  FIGS.  1 ,  5 A, and  5 B , to position the brush head  104  on the handle  102 , the user may orient the brush head  104  such that the cleaning elements  152  are facing in the same direction as the faceplate  140  of the housing  110 . The user inserts the drive shaft  120  into the opening  166  on the brush body  150  and through the shaft passage  202  of the biasing collar  164  and the shaft passage  172  of the retainer  162 . The drive shaft  120  may slide within the biasing collar  164  and the retainer  162  until the beveled front edge  192  impacts the shoulder  130  of the drive shaft  120 . The engagement between the beveled front edge  192  of the keyed surface  184  and the shoulder  130  of the drive shaft  120 , prevents the drive shaft  120  from moving further along a length of the brush body  150 . The keyed feature  124  or flat of the drive shaft  120  aligns with and engages the keyed surface  184  of the retainer  162 . The keyed feature  124  of the drive shaft  120  may assist in ensuring that the drive shaft  120  is secured in a correct orientation relative to the brush head  104  and prevent the drive shaft  120  from being inserted and secured in incorrect orientations. 
     As the drive shaft  120  slides into engagement with the keyed surface  184  of the retainer  162 , the drive shaft  120  exerts a force against the engagement arm  170 , causing the engagement arm  170  to flex outwards, e.g., away from a center axis of the retainer  162 , e.g., causing the free end  190  to move relative to the attached end  188  (see flexed position in  FIGS.  5 A and  5 B ). The retention feature  182  then engages the outer surface of the drive shaft  120 , causing the engagement arm  170  to be secured in a flexed or deformed position. The free end  190  of the engagement arm  170 , is flexed outwards and engages or abuts the interior wall of the brush body  150 . With the engagement of the free end  190  against the interior wall, the engagement arm  170  may be converted from a cantilevered beam structure to a simply supported beam structure as the free end  190  is supported on the interior of the brush body  150 . This may act to increase the rigidity of the engagement arm  170 , which helps to increase the biasing force exerted by the engagement arm  170  against the drive shaft  120 . In some embodiments, such a configuration may allow the retainer  162 , and specifically, the engagement arm  170 , to be smaller in dimension, allowing more compact constructions for the brush head  104 . 
     With reference to  FIG.  5 B , the force exerted on the drive shaft  120  from the engagement arm  170  presses the keyed feature  124  of the drive shaft  120  against the keyed surface  184  of the retainer  162 , preventing the drive shaft  120  from being inadvertently removed from the brush head  104 . Additionally, when the drive shaft  120  is aligned on the keyed surface  184 , the retainer  162  will act as a clocking feature, and translate motion from the drive shaft  120  to the brush body  150 . The retainer  162  will also prevent relative motion between the drive shaft  120  and the brush body  150 , e.g., all motion from the drive shaft  120  will transfer to the brush head  104  without slippage. 
     In some embodiments, as the drive shaft  120  is inserted, it may contact the retention feature  182 , which causes the engagement arm  170  to bend or flex as substantially a rigid body. Due to this the insertion force to insert the drive shaft  120  into the retainer  162  may be relatively low. 
     As the drive shaft  120  is positioned within the brush head  104 , the drive shaft  120  engages the biasing collar  164  and exerts a force on the coupling surface  210  of the biasing arm  200 . This force causes the biasing arm  200  to flex or deform and the free end  214  to move away from the center axis C A  of the biasing collar  164 . The free end  214  engages against an interior surface of the brush body  150  (see flexed position in  FIGS.  5 A and  5 B ). In some embodiments, as the free end  214  engages the interior surface or wall, the biasing arm  200  is converted from a cantilevered beam to a simply supported beam as the free end  214  is supported by the wall or surface. In these configurations, as with the engagement arm  170 , the biasing arm  200  may become more rigid and be configured to exert an increased force as compared to conventional retaining structures, but at a smaller overall size. In other words, the biasing force exerted by the biasing collar  164  may be increased over other similarly sized but differently configured retention structures. 
     The curvature of the biasing arm  200  is biased or loaded and the coupling surface  210  acts to exert a force against the drive shaft  120 . The force exerted forces the drive shaft  120  away from the coupling surface  210  and towards the interior surface  218  of the biasing collar  164 . Specifically, the biasing arm  200  forces the drive shaft  120  towards the contact pads  216   a ,  216   b , ensuring that the drive shaft  120  outer surface abuts against the contact pads  216   a ,  216   b . Notably, even as the contact pads  216   a ,  216   b  or other features within the brush body  150  or the drive shaft  120  may wear and lose thickness over time, the force by the biasing collar  164  on the drive shaft  120  helps to ensure that the drive shaft  120  has multiple contact points within the attachment assembly  160 . In other words, the biasing collar  164  counteracts loss in tolerance due to wear or the like, helping to define a tight fit between the drive shaft  120  and the brush head  104 . 
     Once the brush head  104  is positioned on the handle  102 , the user may activate the motor  230  to use the oral cleansing device  100 . When activated, the motor  230  causes the drive shaft  120  to move, e.g., oscillate. Due to the clocked connection to the brush body  150  via the attachment assembly  160 , the motion generated by the motor  230  is translated to the brush head  104 , causing the brush head  104  to move correspondingly (e.g., oscillate). The attachment assembly  160  also prevents relative movement, such as slippage, between the drive shaft  120  and the brush body  150 , helping to ensure that almost all motion generated is transferred to the brush head  104 . 
     With reference to  FIG.  5 A , as a user places the brush head  104  in his or her oral cavity, e.g., along a tooth or gum surface, a brushing force B F  may be generated. The angle of the brushing force B F  will vary based on a position of the brush head  104  within the user&#39;s oral cavity, but often will be normal to the head portion  158  as the cleaning elements  152  may generally be oriented to be normal to the oral surface being cleaned. In these instances, the attachment assembly  160  and specifically the biasing arm  200  is configured to counteract such a force and flex against the interior surface of the brush body  150  to maintain the tight connection between the drive shaft  120  and the biasing collar  164 . In other words, the biasing arm  200  may be biased in the direction of the brushing force Bf or biased in a direction normal or perpendicular to the head portion  158  and in an opposite direction. 
     When cleaning is done or the user otherwise wishes to remove the brush head  104  (e.g., for replacement or the like), the user may pull on the brush head  104  in direction opposite of the handle  102 . This force overcomes the force generated by the retainer  162  and specifically the engagement arm  170 , causing the engagement arm  170  to further deform, defining a gap between the retention feature  182  and the drive shaft  120 , allowing the drive shaft  120  to move relative thereto. Similarly, the user force overcomes the force exerted by the biasing arm  200 , allowing the drive shaft  120  to move or slide relative thereto. This allows the user to then continue to move the handle  102  or brush head  104  relative to the other, removing the drive shaft  120  from the shaft cavity  156 . 
     All relative and directional references (including top, bottom, side, front, rear, and so forth) are given by way of example to aid the reader&#39;s understanding of the examples described herein. They should not be read to be requirements or limitations, particularly as to the position, orientation, or use unless specifically set forth in the claims. Connection references (e.g., attached, coupled, connected, joined, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. As such, connection references do not necessarily infer that two elements are directly connected and in fixed relation to each other, unless specifically set forth in the claims. 
     The present disclosure teaches by way of example and not by limitation. Therefore, the matter contained in the above description or shown in the accompanying drawings should be interpreted as illustrative and not in a limiting sense. The following claims are intended to cover all generic and specific features described herein, as well as all statements of the scope of the present method and system, which, as a matter of language, might be said to fall there between.