Patent Publication Number: US-2023137156-A1

Title: Friction ring plier

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to U.S. Provisional Patent Application Ser. No. 63/273,011, filed on Oct. 28, 2021, which is incorporated by reference herein in its entirety. 
    
    
     FIELD OF THE INVENTION 
     The present subject matter relates generally to plier tools such as split ring or snap ring pliers. 
     BACKGROUND 
     Split rings (also called snap rings, retaining rings, or friction rings) are circular retaining elements usable to limit translation of various mechanical elements such as bearings, gears, pulleys, sockets relative to a shaft. For example, a friction ring can engage an annular groove formed in an anvil of an impact driver, such to inhibit axial translation by engaging a removable socket at least partially encompassing the anvil. In such an example, the friction ring can be replaced by a user by first engaging, and then expanding, the friction ring with a ring plier until an internal diameter of the friction ring is greater than a diameter of the anvil to thereby enable the friction ring to be axially translated relative to the anvil. Friction rings of a variety of tools or equipment can be replaced using a similar method. 
     Various types of ring pliers may be used to replace split rings of various tools, equipment, or machinery. For example, ring pliers may be used to replace a friction ring located on an anvil of impact driver. Such ring pliers may include a pair of pivotably coupled arms each defining a handle at a proximal end of each arm and a protrusion extending beyond a distal end of each arm. The protrusions extending from the arms are configured to engage opposing ends of the friction ring by extending into a gap or split in the friction ring. For example, when the protrusions of the pair of arms are positioned within the gap or split in the friction ring, a user can squeeze (e.g., move inwardly or toward each other) the handles of the pair of arms to cause the protrusions to move away from each other, thereby expanding a diameter of the friction ring, such as beyond a diameter of an anvil of an impact driver. 
     The user may maintain inward force on the handles of the arms and move the pliers to install the friction ring onto the anvil of the impact driver, or move the ring pliers to remove the friction ring from the anvil of the impact driver. However, currently available ring pliers have a pair of arms that can often slip off or otherwise disengage the opposing ends of the friction ring during removal or installation of the friction ring. This is especially problematic should the friction ring contact the anvil of the impact driver during installation or removal and may result in several time-consuming installation or removal attempts for the user as the friction ring either is launched from the arms during installation or slips off the arms and back onto the anvil for removal. Additionally, friction rings can possess a significant amount of stored elastic energy when in an expanded state, which can cause the friction ring fly off the protrusions and pose a danger to the user or those about the user during the installation or removal process. 
     After the friction ring has been removed from the anvil using the ring plier, a user can alternatively utilize an anvil block instead of the ring plier to install a replacement friction ring. In general, an anvil block is a body defining a first bore configured to receive a replacement friction ring and a second co-axial bore extending deeper into the handle, relative to the first bore, and configured to receive a portion of the anvil of the impact driver about which the friction ring is to be received thereon. For example, when a friction ring is located within the first bore, a user can insert a portion of the anvil of the impact driver axially through the friction ring and into the second bore, such that the friction ring is expanded by the anvil moving therethrough, until the friction ring is received within an annular groove defined by the anvil. However, such anvil blocks are separate from the pliers and must be located for installation. In view of the above issues, an improved ring plier is desirable. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. 
         FIG.  1    illustrates an isometric view of a friction ring plier, in accordance with one embodiment of the present application. 
         FIG.  2    illustrates an isometric view of the friction ring plier of  FIG.  1    engaging a friction ring of an impact driver. 
         FIG.  3 A  illustrates an isometric view of a second handle of the friction ring plier of  FIG.  1    with a friction ring removed therefrom. 
         FIG.  3 B  illustrates an isometric view of a second handle of the friction ring plier of  FIG.  1    with a friction ring received therein. 
         FIG.  4    illustrates a flowchart of a method of replacing a friction ring of an impact driver using a friction ring plier, in accordance with one embodiment of the present application. 
     
    
    
     DETAILED DESCRIPTION 
     The following description and the drawings sufficiently illustrate specific examples to enable those skilled in the art to practice them. Other examples may incorporate structural, process, or other changes without departing from the scope of the present subject matter. 
     The present disclosure addresses the issues described herein, and others as known to a person of skill in the art. In various embodiments, the present subject matter provides a friction ring plier capable of engaging opposing ends of a friction ring to prevent disengagement of it from the friction ring plier during installation or removal of the friction ring. For example, in various embodiments, the friction ring plier includes a pair of protrusions extending outwardly from a central axis of a pair of arms. The protrusions are positioned within a gap or split of a friction ring to engage opposing ends of the friction ring, thereby expanding the friction ring for installation or removal of the friction ring. In various embodiments, the projections engage an inner surface of the friction ring so as to limit expansion of the friction ring with respect to the protrusions. This allows the split ring to be enlarged without undue force on the split ring for the sake of removal or installation of the split ring. 
     The projections prevent the friction ring from slipping off a distal end of the protrusions during installation or removal (e.g., during proximal or distal translation of the friction ring plier), such as to improve the ease with which a user can replace a friction ring located on an anvil of an impact driver. Further, in various embodiments, a handle of the friction ring plier can include an anvil block. For example, a handle of a first arm or a second arm of the friction ring plier can define a first bore configured to receive and retain a replacement friction ring therein, and a second co-axial bore configured to receive a portion of the anvil of the impact driver. The handles conveniently expand and retain a replacement friction ring and improve the ease with which a user can install a replacement friction ring onto an anvil of an impact driver. 
       FIG.  1    illustrates an isometric view of a friction ring plier  100 , in accordance with one embodiment of the present application. Also shown in  FIG.  1    is a central axis Al, and orientation indicators “proximal” and “distal.” In the demonstrated exemplary embodiment, friction ring plier  100  includes a first arm  102  and a second arm  104 . The first arm  102  can include a proximal portion  106  and a distal portion  108 , and the second arm  104  can include a proximal portion  110  and a distal portion  112 . The proximal portion  106  of the first arm  102  and the proximal portion  110  of the second arm  104  each include a first handle  114  and a second handle  116 , respectively. The first handle  114  and the second handle  116  can be configured to receive and encompass at least a segment of the proximal portion  106  of the first arm  102  and proximal portion  110  of the second arm, respectively. 
     In various embodiments, the second handle  116  of the second arm  104  define a first bore  118  and a second bore  120 . In various embodiments, the first bore  118  is configured to receive a friction ring  122  therein. For example, the first bore  118  may be configured to contact an outer surface of the friction ring  122 , such that the friction ring  122  is press-fit into the first bore  118 . The second bore  120  can be defined coaxially with the first bore  118  of the second handle  116  and can be configured to receive at least a portion of an anvil of an impact driver, such as by extending deeper into the second handle  116  relative to the first bore  118 . In various embodiments, the first handle  114  of the first arm  102  may define the first bore  118  and the second bore  120 . In still further embodiments, the first and second bore are attached to a handle in the form of a polymeric, hard rubber, metal, or plastic device attachable to either handle. 
     The distal portion  108  of the first arm  102  includes a first protrusion  124  and the distal portion  112  of the second arm  104  includes a second protrusion  126 . The first protrusion  124  and the second protrusion  126  extend axially distally from the distal portion  108  of the first arm  102  and the distal portion  112  of the second arm  104 , respectively, such as parallel to and laterally offset from the central axis A 1 . The first protrusion  124  may include a first projection  128  and the second protrusion  126  may include a second projection  130 . In various embodiments, the first projection  128  extends away from a portion of the first protrusion  124 , and the second projection  130  extends away from a portion of the second projection  130 , relative to the central axis A 1 , and each protrusion extend away from each other to better engage a friction ring. The first protrusion  124  and the first projection  128 , and the second protrusion  126  and the second projection  130 , are configured to collectively engage a friction ring, such as the friction ring  122 . 
     The first arm  102  is pivotably coupled or otherwise pivotably connected to the second arm  104 . For example, the first arm  102  can define a first pivot bore  132  and the second arm  104  can define a second pivot bore  134 . Each of the first pivot bore  132  and the second pivot bore  134  can be configured to contact and receive a fastener  136 , such that the first arm  102  is pivotable relative to the second arm  104  and to the central axis Al. The fastener  136  can be, for example, but not limited to, any of a rivet, screw, bolt, or another type of fastener. The fastener  136  can inserted into the first pivot bore  132  and the second pivot bore  134 , such as the fastener  136  extends transversely through the distal portion  108  of the first arm  102  and the distal portion  112  of the second arm  104 . The fastener  136  can thereby form a pivot point and pivot axis of the friction ring plier  100 . 
     In various embodiments, the friction ring plier  100  includes a biasing feature  138 . The biasing feature  138  may be, for example, but not limited to, a leaf or coil spring. The biasing feature  138  can be located between, and be coupled to, the first arm  102  and the second arm  104 . The biasing feature  138  can be coupled to the first arm  102  and the second arm  104  in various locations, such as generally between the proximal portion  106  and the distal portion  108 , and generally between the proximal portion  110  and the distal portion  112 . In various embodiments, the biasing feature  138  can be configured to bias the distal portion  108  of the first arm  102  toward the distal portion  112  of the second arm  104  or to bias the distal portion  108  of the first arm  102  away from the distal portion  112  of the second arm  104 . 
     In the operation of various embodiments, a user can remove the friction ring  122  ( FIG.  2   ) from an anvil  144  ( FIG.  2   ) of an impact driver  146  ( FIG.  2   ) with the friction ring plier  100 . The user can insert the first protrusion  124  and the second protrusion  126  into a gap  140  ( FIG.  2   ) defined by the friction ring  122 , such as by translating the friction ring plier  100  distally along the central axis A 1  until a distal surface  152  ( FIG.  2   ) of the first protrusion  124  and a distal surface  158  ( FIG.  2   ) of the second protrusion  126  contacts an outer surface  147  ( FIG.  2   ) of the anvil  144 . The user can then engage the first handle  114  and the second handle  116  (e.g., move inwardly or toward each other and the central axis A 1 ) to cause the first protrusion  124  and the second protrusion  126  to move away from each other and the central axis A 1 , thereby expanding the friction ring  122  by moving opposing ends  142  ( FIG.  2   ) of the friction ring  122  defining the gap  140  away from each other and the central axis A 1 , to increase a diameter of the inner surface  143  of the friction ring  122  beyond a dimension of an outer surface  147  ( FIG.  2   ) of the anvil  144 . 
     During such engagement, the opposing ends  142  of the friction ring  122  can be in contact with the first protrusion  124  and the second protrusion  126  to expand the friction ring  122 , and the inner surface  143  ( FIG.  2   ) of the friction ring  122  can be in contact with the first projection  128  and the second projection  130  to prevent distal translation of the friction ring  122  relative to the first protrusion  124  and the second protrusion  126 . A user can finally remove the friction ring  122  from within an annular groove  148  ( FIG.  2   ) defined by the anvil  144  ( FIG.  2   ) via proximal translation of the friction ring pliers  100 , while maintaining inward pressure on the first handle  114  and the second handle  116  to maintain the friction ring  122  in an expanded state. 
     A user can further install the friction ring  122  onto the anvil  144  of the impact driver  146  using a similar method, such as by repeating the above steps, but translating the friction ring plier  100  distally, rather than proximally, while maintaining inward pressure on the first handle  114  and the second handle  116  to maintain the friction ring  122  in an expanded state. In the operation of various embodiments, a user can alternatively install the friction ring  122  onto the anvil  144  of the impact driver  146  using the first bore  118  and the second bore  120 , such as defined in the second handle  116 . For example, when the friction ring  122  is located and retained within the first bore  118 , a user can insert a portion of the anvil  144  axially through the friction ring  122  located within the first bore  118  to contact and expand the inner surface  143  of the friction ring  122  with the outer surface  147  ( FIG.  2   ) of the anvil  144 . The user can then continue to translate the anvil  144  through the friction ring  122  into the second bore  120 , such as until a distal surface of the anvil  144  contacts an end of the second bore  120  to align the friction ring  122  with the annular groove  148  defined by the anvil  144 , to cause the inner surface  143  of the friction ring  122  to become received within the annular groove  148 . 
       FIG.  2    illustrates an isometric view of the friction ring plier  100  of  FIG.  1    engaging a friction ring  122  of an impact driver  146 . Also shown in  FIG.  2    is the central axis A 1 , and orientation indicators Proximal and Distal. The friction ring  122  can include an outer surface  149 . When the friction ring  122  installed on the anvil  144 , the inner surface  143  can be received within the annular groove  148  (shown in shadow in  FIG.  2   ) defined by the anvil  144 , and the outer surface  147  can extend outwardly beyond the outer surface  147  of the anvil  144 , such as to engage and retain a removable socket configured to be positionable on and encompass anvil  144 . In various embodiments, the inner surface  143  of the friction ring  122  can define a diameter measuring about, but not limited to, 0.2-0.4 inches, 0.5-0.7 inches, or 0.8-1.0 inches. In various embodiments, the inner surface  143  of the friction ring  122  can define a diameter measuring 0.375 inches, 0.5 inches, 0.75 inches, or 1.0 inches. 
     The first protrusion  124  can include the first projection  128 , a distal surface  152 , an angled surface  154 , and an outer surface  156 . Similarly, the second protrusion  126  can include the second projection  130 , a distal surface  158 , an angled surface  160 , and an outer surface  162 . The first protrusion  124  and the second protrusion  126 , such as including the first projection  128 , the distal surface  152 , the angled surface  154 , the outer surface  156 , the distal surface  158 , the angled surface  160 , or the outer surface  162 , or any portion or combination thereof, can individually or collectively form various three-dimensional shapes, such as, but not limited to, a cylinder or a semi-cylindrical shape, an ellipse or an ellipsoidal or semi-ellipsoidal shape, or a triangular, rectangular, hexagonal, or octagonal prism. 
     The first protrusion  124  and the second protrusion  126  can extend from the first arm  102  and the second arm  104 , respectively, by various linear distances, such as defined as the distance between the distal surface  152  and the distal surface  158 , and the distal portion  108  and the distal portion  112 , respectively, relative to the central axis A 1 . Such a linear distance can be configured, for example, based on a linear distance defined between the inner surface  143  and the outer surface  149  of the friction ring  122 , such as to help enable the first projection  128  and the second projection  130  to contact the inner surface  143  of the friction ring  122 . The linear distance between the distal surface  152  and the distal portion  108 , and the linear distance between the distal surface  158  and distal portion  112 , can be about, but not limited to, 1-1.5 millimeters, 1.6-2.0 millimeters, 2.1-2.5 millimeters, or 2.6-3.0 millimeters. In various embodiments, the linear distance between the distal surface  152  and the distal portion  108 , and the linear distance between the distal surface  158  and distal portion  112 , can be about 2.1 or 2.5 millimeters. In various embodiments, the linear distance between the distal surface  152  and the distal portion  108 , and the linear distance between the distal surface  158  and distal portion  112 , can be similar or different relative to each other. 
     The first projection  128  can extend laterally outward from the first protrusion  124 , such as from any of various locations between the distal surface  152  and the distal portion  108  of the first arm  102 , and the second projection  130  can extend laterally outward from the second protrusion  126 , such as from any of various location between the distal surface  158  and the distal portion  112  of the second arm  104 . The first projection  128  can extend laterally outward beyond the outer surface  156  of the first protrusion  124 , and the second projection  130  can extend laterally outward beyond the outer surface  162  of the second protrusion  126 , respectively, by any of various linear distances. Such a linear distance can be configured based on, for example, a linear distance defined by the gap  140  of the friction ring  122 , such as measured between the opposing ends  142 , such as to help enable the first projection  128  and the second projection  130  pass through the gap  140  to the inner surface  143  of the friction ring  122 . 
     The first projection  128  can extend laterally outward beyond the outer surface  156  of the first protrusion  124 , and the second projection  130  can extend laterally outward beyond the outer surface  162  of the second protrusion  126 , by about, but not limited to, 0.05-0.10 millimeters, 0.11-0.15 millimeters, 0.16-0.20 millimeters, or 0.21-0.25 millimeters. In various embodiments, the first projection  128  can extend laterally outward beyond the outer surface  156  of the first protrusion  124 , and the second projection  130  can extend laterally outward beyond the outer surface  162  of the second protrusion  126  by 0.15 millimeters or 0.17 millimeters. The first projection  128  can extend laterally outward beyond the outer surface  156  of the first protrusion  124 , and the second projection  130  can extend laterally outward beyond the outer surface  162  of the second protrusion  126  by a linear distance that is similar or different relative to each other. The first projection  128  and the second projection  130  can also extend laterally outward beyond the outer surface  156  and the outer surface  162 , respectively, at similar or at different angles relative to each other and to the central axis A 1 . 
     In various embodiments, the outer surface  156  of the first protrusion  124  and the outer surface  162  of the second protrusion  126  can extend axially distally from the distal portion  108  of the first arm  102  and the distal portion  112  of the second arm  104 , respectively, such by extending parallel to and laterally offset from the central axis A 1  by various linear distances. Such a linear distance can be configured based on, for example, a linear distance defined between the inner surface  143  and the outer surface  149  of the friction ring  122 , such as to help enable the first projection  128  and the second projection  130  to contact the inner surface  143  of the friction ring  122 . In various embodiments, the outer surface  156  of the first protrusion  124  and the outer surface  162  of the second protrusion  126  can also extend at other angles relative to the central axis A 1 , such as at about, but not limited to, 50-60 degrees, 61-70 degrees, 71-80, degrees, 81-90 degrees, 91-100 degrees, 101-110 degrees, or 111-120 degrees. 
     The angled surface  154  of the first protrusion  124  can be a surface of the first protrusion  124  extending between the distal surface  152  and the outer surface  156 , and the angled surface  160  of the can be a surface of the second protrusion  126  extending between the distal surface  158  of the outer surface  162 . The angled surface  154  and the angled surface  160  can extend at various angled relative to the central axis A 1 , such as at about, but not limited to, 1-20 degrees, 21-40 degrees, 41-60 degrees, 61-80 degrees, or 81-90 degrees. In various embodiments, the angled surface  154  and the angled surface  160  can formed a beveled, chamfered, concave, or convex shape, or any combination thereof, such as configured to help facilitate the insertion of the first protrusion  124  and the second protrusion  126  into the gap  140  of the friction ring  122  by contacting the opposing ends  142  thereof during insertion. In various embodiments, any component of the friction ring plier  100  such as including the first arm  102 , the second arm  104 , the first protrusion  124 , and the second protrusion  126 , can be made from various materials such as, but not limited to, metals, plastics, composites, or other materials, or a combination thereof. 
     When the first protrusion  124  and the second protrusion  126  are inserted into the gap  140  defined by the friction ring  122 , the first projection  128  and the second projection  130  can concurrently contact the inner surface  143  of the friction ring  122 , and the outer surface  156  of the first protrusion  124  and the outer surface  162  of the second protrusion  126  can concurrently contact the opposing ends  142  of the friction ring  122 . The opposing ends  142  can generally be opposing surfaces and can include a first end or a first surface and a second end or a second surface. In view of the above, the friction ring plier  100  can thereby engage the friction ring  122  along two axes concurrently, such as by both expanding the friction ring  122  via the outer surface  156  and the outer surface  162 , and preventing distal translation and disengagement of the friction ring  122  from the friction ring plier  100  via the first projection  128  and the second projection  130  during installation or removal (e.g., distal or proximal translation of the friction ring plier  100 ) of the friction ring  122  from the anvil  144  of the impact driver  146 . 
       FIG.  3 A  illustrates an isometric view of a second handle  116  of the friction ring plier  100  of  FIG.  1    with a friction ring  122  removed therefrom.  FIG.  3 B  illustrates an isometric view of a second handle  116  of the friction ring plier  100  of  FIG.  1    with a friction ring  122  received therein.  FIGS.  3 A- 3 B  are discussed below concurrently. For brevity, the following description discusses various aspects and features of the friction ring plier  100  with reference to the second handle  116  of the second arm  104  (shown in shadow in  FIGS.  3 A- 3 B ), but the first handle  114  ( FIG.  1   ) of the first arm  102  ( FIG.  1   ) can also include any of the following aspects or features. 
     The second handle  116  can include an inner portion  164  and an outer portion  166 . The outer portion  166  can generally be a portion of the second handle  116  configured to receive and encompass the proximal portion  106  of the first arm  102  and the proximal portion  110  of the second arm  104 . The inner portion  164  can generally be a portion of the second handle  116  extending inwardly, such as toward the central axis A 1  ( FIG.  1   ) from the outer portion  166 . The inner portion  164  and the outer portion  166  can individually or collectively form various three-dimensional shapes. For example, the inner portion  164  or various portions thereof, such as front surface or a back surface, can form a generally circular or semi-circular, ellipsoidal or semi-ellipsoidal, or rectangular shape. The outer portion  166  can form a generally elongated or flattened shape, such as similar or generally conforming to a shape, or shapes defined by, various portions of the second arm  104 . As discussed with regard to  FIG.  1    above, the second handle  116  can define a first bore  118  and a second bore  120 . The first bore  118  and the second bore  120  can extend at least partially through a depth or height of the inner portion  164  of the handle  116 , such as orthogonally or otherwise transversely relative to the central axis A 1  ( FIG.  1   ). 
     The first bore  118  can be configured to receive the friction ring  122 . For example, the first bore  118  can be configured to contact and engage the outer surface  149  of the friction ring  122 , such as to retain or store the friction ring  122  therein. As such, the first bore  118  can define a diameter corresponding to, or otherwise based on, a diameter defined by the outer surface  149  of the friction ring  122 . For example, the first bore  118  can define a diameter of about, but not limited to, 0.2-0.5 inches, 0.5-0.7 inches, or 0.7-1.0 inches, and the outer surface  149  of the friction ring  122  can define a diameter of about, but not limited to, 0.19-0.49 inches, 0.49-0.69 inches, or 0.69-0.99 inches, respectively. In one embodiment, the first bore  118  can define a diameter of about 0.52 inches and the outer surface  149  of the friction ring  122  can define a diameter of about 0.51 inches. The second bore  120  can be configured to receive the anvil  144  ( FIG.  2   ) of the impact driver  146  ( FIG.  2   ) therein. For example, the second bore  120  can be configured to contact and engage at least a portion of the outer surface  147  ( FIG.  2   ) of the anvil  144 . 
     The first bore  118  can define a first end  168  and the second bore  120  can define a second end  170 . The second end  170  of the second bore  120  can be defined at a greater linear distance within the second handle  116  relative to the first end  168  of the first bore  118 , such as to allow the anvil  144  ( FIG.  2   ) to extend axially through the friction ring  122  to contact and expand the inner surface  143  of the friction ring  122  when inserted into and at least partially located within the second bore  120 . For example, the first end  168  can be configured to support the friction ring  122  at a depth within the second handle  116  configured to align the annular groove  148  ( FIG.  2   ) of the anvil  144  with the inner surface  143  of the friction ring  122 , such as to help enable a user to install the friction ring  122  thereon or thereinto by inserting the anvil  144  through the first bore  118  and the friction ring  122  to contact the second end  170  of the second bore  120  with a distal surface of the anvil  144 . 
     The second handle  116 , and any features or components thereof, can be made from various materials, such as, but not limited to, rubber, plastic, metals, composites, other materials, or a combination thereof. For example, the second handle  116  can be made from an elastically deformable material, such as to help allow the inner surface  143  and the outer surface  149  of the friction ring  122  expand within the first bore  118  during insertion of the anvil  144  through the friction ring  122 . In various embodiments, the second handle  116  can be a handle portion of any currently available pivotable split ring pliers or other plier tools, such as configured to receive an arm of any currently available pivotable split ring pliers or other plier tools to enable such split ring pliers or other tools to receive and retain a replacement split ring therein. 
       FIG.  4    illustrates a flowchart of a method of replacing a friction ring of an impact driver using a friction ring plier, in accordance with one embodiment of the present application. The steps or operations of the method  200  are illustrated in a particular order for convenience and clarity. The discussed operations can be performed in parallel or in a different sequence without materially impacting other operations. The method  200  as discussed includes operations that can be performed by multiple different actors, devices, and/or systems. It is understood that subsets of the operations discussed in the method  200  can be attributable to a single actor device, or system, and could be considered a separate standalone process or method. 
     The method  200  can include operation  202 . The operation  202  can include inserting a first protrusion and a second protrusion extending from a first pivotable arm and a second pivotable arm, respectively, into a gap defined by a first friction ring located on an anvil of the impact driver to concurrently engage opposing ends of the first friction ring and an inner surface of the first friction ring. For example, a friction ring can be a split ring including opposing ends defining a gap extending between an inner surface and an outer surface of the friction ring. A user can position the friction ring plier such that the opposing ends of the friction ring are in contact with an outer surface of each of the first protrusion and the second protrusion. When the opposing ends of the friction ring are in contact with an outer surface of each of the first protrusion and the second protrusion, a distal surface of each of the first protrusion and the second protrusion can contact the anvil of the impact driver, and the first projection and the second projection can extend outwardly beyond an outer surface of the first protrusion and the second protrusion to contact an inner surface of the friction ring. The friction ring plier can thereby retain the friction ring along at least two axes during expansion of the inner surface of the friction ring beyond an outer surface of the anvil via translation of the first protrusion away from the second protrusion. 
     The operation  200  can include operation  204 . The operation  204  can include engaging the first pivotable arm and the second pivotable arm to expand the inner surface of the first friction ring beyond an outer surface of the anvil; and translating the friction ring plier proximally along the central axis to remove the first friction ring from the anvil of the impact driver. For example, a user can translate the friction ring plier toward themselves, such as proximally along a central axis, while concurrently engaging the first arm and the second arm to maintain inward pressure on a first handle of the first arm and a second handle of the second arm to maintain a friction ring in an expanded state. The friction ring plier can thereby retain a friction ring along at least two axes during removal of the friction ring from the anvil of the impact driver. 
     The operation  200  can include operation  206 . The operation  206  can include inserting a first protrusion and a second protrusion extending from a first pivotable arm and a second pivotable arm, respectively, into a gap defined by a second friction ring to concurrently engage opposing ends of the second friction ring and an inner surface of the second friction ring, wherein inserting includes translating the friction ring plier distally along the central axis. For example, a friction ring can be a split ring including opposing ends defining a gap extending between an inner surface and an outer surface of the friction ring. A user can position the friction ring plier such that the opposing ends of the friction ring are in contact with an outer surface of each of the first protrusion and the second protrusion. When the opposing ends of the friction ring are in contact with an outer surface of each of the first protrusion and the second protrusion, the first projection and the second projection can extend outwardly beyond an outer surface of the first protrusion and the second protrusion to contact an inner surface of the friction ring. The friction ring plier can thereby retain the friction ring along at least two axes during expansion of the inner surface of the friction ring beyond an outer surface of the anvil via translation of the first protrusion away from the second protrusion. 
     The operation can include operation  208 . The operation  208  can include engaging the first pivotable arm and the second pivotable arm to expand the inner surface of the second friction ring beyond an outer surface of the anvil; and translating the friction ring plier distally along the central axis to install the second friction ring onto the anvil of the impact driver. The method  200  can include operation  208 . The operation  208  can include translating the friction ring plier distally along the central axis to install the second friction ring onto the anvil of the impact driver. For example, a user can translate the friction ring plier away from themselves, such as distally along the central axis, while concurrently engaging the first arm and the second arm to maintain inward pressure on a first handle of the first arm and a second handle of the second arm, until the friction ring is aligned and received within an annular groove defined by the anvil. The friction ring plier can thereby retain the friction ring along at least two axes during installation of the friction ring onto the anvil of the impact driver. 
     The method  200  can include operation  210 . The operation  210  can include inserting a second friction ring into a first bore defined in the first pivotable arm or the second pivotable arm such that the second friction ring contacts a first end of the first bore; and inserting the anvil of the impact driver into the first bore and a second bore defined coaxially with the first bore to install the second friction ring onto the anvil of the impact driver. For example, the first end of the first bore can be configured to support the friction ring at a depth within the handle configured to align an annular groove of the anvil with the inner surface of the friction ring to install the friction ring thereon or thereinto when the anvil is inserted through the first bore and the friction ring such that distal surface of the anvil contacts the second end of the second bore. 
     The above detailed description includes references to the accompanying drawings, which form a part of the detailed description. The drawings show, by way of illustration, specific embodiments in which the invention can be practiced. These embodiments are also referred to herein as “examples.” In this document, the terms “a” or “an” are used, as is common in patent documents, to include one or more than one, independent of any other instances or usages of “at least one” or “one or more.” The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. 
     NOTES AND EXAMPLES 
     The following, non-limiting examples, detail certain aspects of the present subject matter to solve the challenges and provide the benefits discussed herein, among others. 
     Example 1 is a plier tool for expanding a friction ring having a first opposing end and a second opposing end, comprising: a first arm including a distal portion comprising a first protrusion extending distally from a central axis and a first projection extending outwardly from the first protrusion away from the central axis, the first projection configured to engage the first opposing end of the friction ring; and a second arm including a distal portion comprising a second protrusion extending distally from the central axis and a second projection extending outwardly from the second protrusion away from the central axis, the second projection configured to engage the second opposing end of the friction ring; wherein the second arm is pivotably connected to the first arm to cause the distal portion of the first arm and the distal portion of the second arm to move away from each other and the central axis so as to expand the friction ring for installation or removal. 
     In Example 2, the subject matter of Example 1 includes, wherein the first projection and the second projection extend radially outwardly beyond an outer surface of the first protrusion and the second protrusion, respectively, between about 0.10 millimeters and about 0.20 millimeters. 
     In Example 3, the subject matter of Examples 1-2 includes, wherein the first protrusion includes a first angled surface extending between a distal surface of the first protrusion and the first projection, and the second protrusion includes a second angled surface extending between a distal surface of the second protrusion and the second projection. 
     In Example 4, the subject matter of Example 3 includes, wherein the first angled surface and the second angled surface each extend at an angle of between about 20 degrees and about 40 degrees relative to the central axis. 
     In Example 5, the subject matter of Examples 1-4 includes, wherein a distance defined between the distal surface of the first protrusion and the distal portion of the first arm, and a distance defined between a distal surface of the second protrusion and the distal portion of the second arm is between about 2 millimeters and about 3 millimeters. 
     In Example 6, the subject matter of Examples 1-5 includes, a biasing element extending between the proximal portion of the first arm and the proximal portion of the second arm, the biasing element configured to bias the proximal portion of the first arm away from the proximal portion of the second arm and the central axis. 
     In Example 7, the subject matter of Examples 1-6 includes, wherein the proximal portion of the first arm and the proximal portion of second arm are each received within and encompassed by first handle and a second handle, respectively. 
     In Example 8, the subject matter of Example 7 includes, wherein the first handle or the second handle defines a first bore extending at least partially therethrough, and a second bore extending co-axially within the first bore, wherein the first bore is configured to receive a friction ring therein and the second bore is configured to receive at least a portion of an anvil of an impact driver therein. 
     Example 9 is a plier tool for expanding a friction ring having a first opposing end and a second opposing end, comprising: a first arm including a distal portion comprising a first protrusion extending distally from a central axis and a first projection extending outwardly from the first protrusion away from the central axis, the first projection configured to engage the first opposing end of the friction ring; and a second arm including a distal portion comprising a second protrusion extending distally from the central axis and a second projection extending outwardly from the second protrusion away from the central axis, the second projection configured to engage the second opposing end of the friction ring, the first or the second handle defining a first bore configured to receive the friction ring therein and a second bore configured to receive at least a portion of an anvil of an impact driver therein; wherein the second arm is pivotably connected to the first arm to cause the distal portion of the first arm and the distal portion of the second arm to move away from each other and the central axis so as to expand the split ring for installation or removal. 
     In Example 10, the subject matter of Example 9 includes, wherein the first protrusion includes a first projection extending radially outwardly beyond an outer surface of the first protrusion orthogonally to the central axis, the first projection configured to engage an inner surface of the friction ring; and wherein the second protrusion includes a second projection extending radially outwardly beyond an outer surface of the second protrusion, the first projection configured to engage an inner surface of the friction ring. 
     In Example 11, the subject matter of Example 10 includes, wherein the first projection and the second projection extend radially outwardly beyond the outer surface of the first protrusion and the second protrusion, respectively, between about 0.10 millimeters and about 0.20 millimeters. 
     In Example 12, the subject matter of Examples 10-11 includes, wherein the first protrusion includes a first angled surface extending between a distal surface of the first protrusion and the first projection, and the second protrusion includes a second angled surface extending between a distal surface of the second protrusion and the second projection. 
     In Example 13, the subject matter of Example 12 includes, wherein the first angled surface and the second angled surface each extend at an angle of between about 20 degrees and about 40 degrees relative to the central axis. 
     In Example 14, the subject matter of Examples 12-13 includes, wherein a distance defined between the distal surface of the first protrusion and the distal portion of the first arm, and a distance defined between the distal surface of the second protrusion and the distal portion of the second arm is between about 2 millimeters and about 3 millimeters. 
     In Example 15, the subject matter of Examples 9-14 includes, a biasing element extending between a proximal portion of the first arm and the proximal portion of the second arm, the biasing element configured to bias the proximal portion of the first arm away from the proximal portion of the second arm and the central axis. 
     In Example 16, the subject matter of Examples 9-15 includes, wherein the first bore includes a first end configured to limit translation of the friction ring within the first bore, and wherein the second bore includes a second end configured to limit translation of the anvil of the impact driver to align an annular groove configured to receive the friction ring therein with the first end of the first bore. 
     In Example 17, the subject matter of Examples 10-16 includes, wherein the outer surface of the first protrusion and the outer surface of the second protrusion each form a semi-ellipsoidal shape, such that the outer surface of the first protrusion and the outer surface of the second protrusion collectively form an ellipsoidal shape. 
     Example 18 is a method of replacing a friction ring of an impact driver using a friction ring plier, the method comprising: inserting a first protrusion and a second protrusion extending from a first pivotable arm and a second pivotable arm, respectively, into a gap defined by a first friction ring located on an anvil of the impact driver to concurrently engage opposing ends of the first friction ring and an inner surface of the first friction ring, wherein inserting includes, translating the friction ring plier distally along a central axis; engaging the first pivotable arm and the second pivotable arm to expand the inner surface of the first friction ring beyond an outer surface of the anvil; and translating the friction ring plier proximally along the central axis to remove the first friction ring from the anvil of the impact driver. 
     In Example 19, the subject matter of Example 18 includes, inserting a first protrusion and a second protrusion extending from a first pivotable arm and a second pivotable arm, respectively, into a gap defined by a second friction ring to concurrently engage opposing ends of the second friction ring and an inner surface of the second friction ring, wherein inserting includes translating the friction ring plier distally along the central axis; engaging the first pivotable arm and the second pivotable arm to expand the inner surface of the second friction ring beyond an outer surface of the anvil; and translating the friction ring plier distally along the central axis to install the second friction ring onto the anvil of the impact driver. 
     In Example 20, the subject matter of Examples 18-19 includes, inserting a second friction ring into a first bore defined in the first pivotable arm or the second pivotable arm such that the second friction ring contacts a first end of the first bore; and inserting the anvil of the impact driver into the first bore and a second bore defined coaxially with the first bore to install the second friction ring onto the anvil of the impact driver. 
     Example 21 is at least one machine-readable medium including instructions that, when executed by processing circuitry, cause the processing circuitry to perform operations to implement of any of Examples 1-20. 
     Example 22 is an apparatus comprising means to implement of any of Examples 1-20. 
     Example 23 is a system to implement of any of Examples 1-20. 
     Example 24 is a method to implement of any of Examples 1-20.