Patent Description:
Fasteners commonly include mechanisms or design features for ensuring that fastener elements do not loosen over time, potentially allowing joined elements to loosen or separate. Examples of mechanisms include thread bore inserts and screw thread profiles that deform when tightened. Fasteners accessories like lock members, cotter pins, and lock wires are also commonly used with fasteners to prevent fastener elements from loosening. Adhesive materials, like epoxy, can be applied to fastener threads to stake fastener elements and prevent fastener elements from loosening. However, conventional fastener mechanisms, accessories, and adhesive materials may not be suitable for some applications, such as high temperature environments or with structures subject to extreme vibration.

Moreover, the time and cost required to manufacture fastener assemblies could be reduced. For example, at least some fastener mechanisms or accessories for ensuring that fastener elements do not loosen over time require custom or specialized manufacturing processes. Such processes can increase the time and cost required to manufacture fastener assemblies. <CIT> reveals a fixing device with a locking mechanism including a bolt having a hexagonal head, a seat attached to the bottom face of the bolt head, and a washer to be fit onto the threaded shaft of the bolt.

Accordingly, there is a need for an improved fastener assembly that do not loosen over time and can be produced using manufacturing processes that are less expensive and quicker than manufacturing processes for conventional fasteners.

This task is solved by a fastener assembly with the features of claim <NUM>. The subclaims show preferred further embodiments of the invention. The fastener assembly includes a threaded member including a threaded body portion and a head portion. The fastener assembly also includes a first lock member including a plurality of axially-extending ratchet teeth and defining an aperture extending therethrough. The aperture is sized to receive the threaded body portion. The fastener assembly further includes a second lock member including a base portion configured to couple to the threaded member for rotation therewith and at least one spring finger extending axially from the base portion. The at least one spring finger has a proximal end joined to the base portion and a free end opposite the proximal end. The second lock member has a lock position in which the free end of the at least one spring finger is configured to engage the plurality of axially-extending ratchet teeth and an unlock position in which the free end of the at least one spring finger is spaced from the plurality of axially-extending ratchet teeth.

In another aspect, a locking mechanism for a fastener assembly is provided. The locking mechanism includes a first lock member including a plurality of axially-extending ratchet teeth and a body defining an aperture extending therethrough. The aperture is sized to receive a threaded member of the fastener assembly. The body has an inner circumferential surface, an outer circumferential surface, and an annular surface extending between the inner circumferential surface and the outer circumferential surface. The axially-extending ratchet teeth extend upward from the annular surface. The fastener assembly also includes a second lock member including an annular ring configured to couple to the threaded member for rotation therewith and a pair of spring fingers extending axially from the annular ring. Each spring finger of the pair of spring fingers has a proximal end joined to the annular ring and a free end opposite the proximal end. The second lock member has a lock position in which each free end is configured to engage the plurality of axially-extending ratchet teeth and an unlock position in which each free end is spaced from the plurality of axially-extending ratchet teeth.

In yet another aspect, a method of assembling a locking mechanism for a fastener including a threaded body portion is provided. The method includes providing a first lock member including a plurality of axially-extending ratchet teeth. The first lock member defines a first aperture extending therethrough. The first aperture is sized to receive the threaded body portion. The method also includes forming a base portion of a second lock member. The base portion defines a second aperture extending therethrough. The second aperture is sized to receive the threaded body portion. The method further includes forming at least one spring finger of the second lock member. The at least one spring finger has a proximal end joined to the base portion and a free end opposite the proximal end. The method also includes bending the at least one spring finger at an angle relative to the base portion such that the at least one spring finger extends axially from the base portion. The second lock member is positionable between a lock position in which the free end of the at least one spring finger is configured to engage the plurality of axially-extending ratchet teeth and an unlock position in which the free end of the at least one spring finger is spaced from the plurality of axially-extending ratchet teeth. The base portion and the at least one spring finger are a single piece.

In still another aspect, a fastener assembly is provided. The fastener assembly includes a threaded member including a threaded body portion, a nut configured to threadably engage the threaded body portion, a first lock member, and a second lock member. The first lock member includes a plurality of axially-extending ratchet teeth and defines an aperture extending therethrough. The aperture is sized to receive the threaded body portion. The first lock member includes at least one anti-rotation structure configured to rotationally fix the first lock member with respect to the threaded member. The second lock member includes a base portion configured to couple to the nut for rotation therewith and at least one spring finger extending axially from the base portion. The at least one spring finger has a proximal end joined to the base portion and a free end opposite the proximal end. The second lock member has a lock position in which the free end of the at least one spring finger is configured to engage the plurality of axially-extending ratchet teeth and an unlock position in which the free end of the at least one spring finger is spaced from the plurality of axially-extending ratchet teeth.

Accordingly, a value modified by a term or terms such as "about," "approximately," and "substantially" are not to be limited to the precise value specified. Here and throughout the specification and claims, range limitations may be combined and/or interchanged; such ranges are identified and include all the sub-ranges contained therein unless context or language indicates otherwise.

Relative descriptions herein such as axial, radial, upward, downward, left, right, up, down, length, height, width, thickness and the like are with reference to the Figures, and not meant in a limiting sense. Additionally, the illustrated embodiments can be understood as providing exemplary features of varying detail of certain embodiments, and therefore, features, components, modules, elements, and/or aspects of the illustrations can be otherwise combined, interconnected, sequenced, separated, interchanged, positioned, and/or rearranged without materially departing from the disclosed fastener assemblies. Additionally, the shapes and sizes of components are also exemplary and can be altered without materially affecting or limiting the disclosed technology.

Embodiments described herein are implemented and utilized in numerous ways, including without limitation as a process, an apparatus, a system, a device, a method of installation and removal, and a method for applications now known and later developed. These and other unique features of the technology described herein will become more readily apparent from the following description and the accompanying drawings.

The fastening devices and systems described herein provide many advantages over known fastening devices and systems. In general, threaded fasteners are used to fixedly connect two or more components in a variety of applications such as, without limitation, surgical implants, industrial applications, aerospace applications, and building applications. Among other features and benefits, the disclosed fastening devices and systems facilitate one or more of quick and easy installation and/or removal, reduced torque requirements, vibration resistant secured tightness, and/or single end access for blind fastening applications.

In some embodiments, a locking mechanism includes an elongated threaded member having a threaded segment, a lock member having axially-extending engagement teeth, a first lock member having an aperture to receive the threaded member and a plurality of ratchet teeth, and a second lock member having an annular body with an upstanding spring finger and at least one tooth configured to engage the ratchet teeth of the first lock member. In some embodiments, a spring finger of the second lock member cooperates with an axial slot coupled to the threaded segment of the threaded member to fix the lock member in rotation relative to the threaded member. In other embodiments, one of the first lock member or the second lock member includes one or more engagement features that engage the threaded member and allow rotation only therewith. The tooth of the second lock member is displaceable radially or axially relative to the first lock member for engaging and disengaging the engagement teeth. In a lock position, the tooth of the second lock member intermeshes with the ratchet teeth to prevent rotation of the first lock member relative to the second lock member in at least one direction. In an unlock position, the second lock member is rotatable relative to the first lock member such that the second lock member and the threaded member are rotatable relative to the first lock member.

In further embodiments, the threaded member can include a flat or two or more flats or other features designed to prevent rotation of the first or second lock member in relation to the threaded member. The flat can extend axially along a length of threaded member. The banking feature of the threaded member can include the flat. The flat can be radially adjacent to the threaded segment of the threaded member. The flat can be a first flat, and the threaded member can include one or more second flats. The banking feature can include both the first flat and the second flat. The second flat can extend axially along the threaded member. The second flat can be disposed on a side of the threaded member diametrically opposite the first flat. The threaded segment can extend circumferentially about the threaded member and couple the first flat with the second flat.

Also, in some embodiments, the first or second lock member can have opposed axial surfaces separated by an axial thickness of the lock member. Engagement teeth can extend axially away from at least one of the axial surfaces. Alternatively, the engagement teeth can be disposed on a radial surface of a circumferential wall and extend radially from the circumferential wall. A central aperture can extend through the thickness of the lock member between the axial surfaces of the lock member. The central aperture can include the banking portion that complements the banking feature of the threaded member. For example, one or more flat segments can bound the central aperture. The flat segment can correspond with the banking feature of the threaded member. The central aperture can include one or more arcuate segments bounding the central aperture. The arcuate segment can correspond to the threaded segment(s) of the threaded member. The central aperture can include both flat and arcuate segments, and a stress reduction feature can be disposed at an intersection of a flat segment and an arcuate segment.

In addition, in some embodiments, the first or second lock member can include a spring finger having a free end and a proximal end. The proximal end can be connected to the annular body of the lock member. A tooth and the spring finger can be circumferentially aligned with one another. The annular body of the lock member can have a round, oval, square, rectangular, or any suitably shaped axial profile. The spring finger can be displaced in response to inward force exerted on the spring finger at a location between the fixed and free ends of the spring finger. The spring finger can be a first spring finger, and the lock member can include a second spring finger connected to the annular body on a side of the annular body opposite the first spring finger.

Moreover, in further embodiments, the first or second lock member can have first and second teeth that each extend axially outward or radially outward from a spring tab or finger coupled to the annular body. The teeth can be disposed on the free end of the spring finger spaced from the annular body. It is also contemplated that more than one circumferentially adjacent tooth can be on a first spring finger, and that more than one circumferentially adjacent tooth can be on a second spring finger.

In some embodiments, a nut member or head of the threaded member can have a cavity arranged to receive the annular body of the lock member. The nut member or head can have a circumference with a plurality of faces. The plurality of faces of the nut member or head can form a hexagonal circumference extending about the nut member or head. One or more of the faces of the nut member or head can have an axial slot. The axial slot can extend between the cavity and an end of the nut member or head opposite the cavity. It is contemplated that the nut member or head can have faces with axial slots disposed on faces that are diametrically opposed to one another.

In addition, in some embodiments, the threaded member, the first lock member, and the second lock member can cooperate as a locking mechanism. The locking mechanism can have a lock position wherein the spring finger of the second lock member urges the teeth into engagement with the engagement teeth of the first lock member, fixing the second lock member in rotation relative to the first lock member and preventing loosening of the fastening mechanism. The locking mechanism can have a tighten or unlock position wherein the teeth on the spring finger of the second lock member are disengaged from the teeth of the first engagement member, rendering the second lock member rotatable relative to the first lock member.

Also, in some embodiments, a spinal fixation system includes a fastener locking mechanism as described above and a rod. The rod seats in the threaded member and below the lock member. It is contemplated that tightening the nut member exerts force on the lock member which in turn presses the rod against the threaded member.

In addition, in some embodiments, the threaded member can have a head portion coupled to an end of a stem section. The head portion can be fixed relative to the stem portion. A joint can be interposed between the head portion and the stem portion, the head portion thereby being movable relative to the stem portion. The head portion can be pivotable relative to the stem portion, such as in a conical movement envelope. The head portion can have a first threaded segment and the stem portion can have a second threaded segment. The first threaded segment can be a male threaded segment corresponding to a female threaded segment defined by the bore of the nut member. The second threaded segment can taper between an end adjacent to the head member and an end of the stem portion opposite the head portion. It is contemplated that the second threaded segment can have threads adapted for seating the threaded member to a bone structure, such as a pedicle.

Moreover, in some embodiments, the threaded member can include a tulip head. The tulip head can have a slot extending therethrough for seating the rod. The slot can be centrally disposed, extending across the top of the threaded member. The slot can be laterally disposed, extending across a side of the threaded member. Lobes can be defined on opposite sides of the slot. The lobes can have the banking feature of the threaded member defined thereon. The lobes can have the threaded segment of the threaded member defined thereon. In a contemplated exemplary embodiment, each lobe has portions of both the threaded segment and the banking feature defined thereon.

In addition, in further embodiments, the first or second lock member can include a central bar portion. The central bar portion can extend across the lock member central aperture and divide the central aperture into first and second portions. One lobe of the threaded member tulip head can extend through the first portion of the central aperture, and another lobe of the threaded member tulip head can extend through the second portion of the central aperture. The central bar portion can extend from the banking portion of the lock member, if present, such that, when the central bar portion is seated with the slot of the tulip head, the lock member is fixed in rotation relative to the tulip head. It is contemplated that central bar portion can seat in the slot of the tulip head, overlay the rod, and can be disposed between the nut member, lock member, and the stem of the threaded member.

In embodiments described herein, a fastener mechanism includes an elongated threaded member and at least one lock member. For example, a first lock member may be coupled to a head of the threaded member or a lock nut for rotation therewith. In some embodiments, the fastener mechanism includes a second lock member that engages the first lock member to allow rotation of the threaded member in a first direction and prevent rotation of the threaded member in a second direction. At least one of the first and second lock members includes at least one tab or spring finger that is positionable to switch the lock member between a lock position in which a free end of the at least one tab or spring finger is configured to engage a plurality of ratchet teeth and an unlock position in which the free end is spaced from the plurality of ratchet teeth. In some embodiments, the at least one tab or finger is integrally formed with the first or second lock member and allows the fastener mechanism to be at least partially formed using a stamping process. As a result, the time and cost required to assemble the fastener locking mechanism is reduced in comparison to at least some known fastener mechanisms.

<FIG> is a perspective view of an exemplary embodiment of a fastener assembly <NUM> including a first lock member <NUM> and a second lock member <NUM>. <FIG> is a side view of fastener assembly <NUM>. <FIG> is a front view of fastener assembly <NUM>. <FIG> is a top view of fastener assembly <NUM>. <FIG> is a bottom view of the fastener assembly <NUM>. In the exemplary embodiment, fastener assembly <NUM> includes a first lock member <NUM>, a second lock member <NUM>, and a threaded member <NUM>. Threaded member <NUM> extends along an axis <NUM>. As used herein, the terms "axial" and "axially" refer to a direction parallel to axis <NUM>. The terms "radial" and "radially" refer to a direction perpendicular to axis <NUM>. Threaded member <NUM> includes a head portion <NUM> and an elongated threaded body portion <NUM> extending axially from head portion <NUM>. Alternatively, threaded member <NUM> may be free of head portion <NUM>. For example and without limitation, threaded member <NUM> may be a bolt, a screw, or any other threaded component that enables fastener assembly <NUM> to function as described herein.

In the exemplary embodiment, head portion <NUM> is a hexagonal head. Alternatively, head portion <NUM> is any form, for example and without limitation, a spline head, a socket cap, a tulip head, and a pan head, that enables fastener assembly <NUM> to function as described herein.

Also, in the exemplary embodiment, second lock member <NUM> is configured to releasably couple to head portion <NUM> of threaded member <NUM> for rotation therewith. In alternative embodiments, second lock member <NUM> is coupled to head portion <NUM> in any manner that enables fastener assembly <NUM> to function as described herein. For example, in some embodiments, second lock member <NUM> is permanently attached to head portion <NUM>. In further embodiments, second lock member <NUM> and head portion <NUM> are integrally formed as a single piece.

In addition, in the exemplary embodiment, head portion <NUM> includes anti-rotation features to prevent rotation of second lock member <NUM> relative to threaded member <NUM>. Anti-rotation features include, for example and without limitation, flats, notches, grooves, slots, or any other feature that enables threaded member <NUM> to function as described herein. In the exemplary embodiment, anti-rotation features include a pair of opposing longitudinally extending slots formed in head portion <NUM>. Slots <NUM> are substantially equal in size and shape, and extend along the entire length of head portion <NUM>. In alternative embodiments, threaded member <NUM> includes any anti-rotation features that enable threaded member <NUM> to operate as described herein. For example, in some embodiments, anti-rotation features are formed at least partially in threaded body portion <NUM>.

In the exemplary embodiment, threaded member <NUM>, first lock member <NUM>, and second lock member <NUM> are fabricated from a metal, for example and without limitation, steel, aluminum, titanium, or a superalloy. Alternatively, threaded member <NUM>, first lock member <NUM>, and second lock member <NUM> are fabricated from any material that enables fastener assembly <NUM> to function as described herein, such as, without limitation, composite materials, resins, fiber reinforced resins, plastics, and fiber reinforced plastics.

<FIG> is a perspective view of first lock member <NUM> of fastener assembly <NUM> (shown in <FIG>). First lock member <NUM> includes an inner portion <NUM> defining an axial aperture <NUM> therethrough and an outer portion <NUM> having a plurality of axially-extending teeth <NUM>. Axial aperture <NUM> is sized to facilitate freely sliding lock member <NUM> onto threaded body portion <NUM> of threaded member <NUM> (shown in <FIG>). As such, axial aperture <NUM> has a diameter slightly greater than a diameter of threaded body portion <NUM> (shown in <FIG>). First lock member <NUM> also includes an anti-rotation structure. The anti-rotation structure includes, for example and without limitation, a member, indent, wedge, or any other component configured to engage another anti-rotation feature. In the exemplary embodiment, the anti-rotation features include a pair of pins <NUM> extending downward from inner portion <NUM> of first lock member <NUM>. Pins <NUM> are received within openings <NUM> defined in panel <NUM> (shown in <FIG>) to rotationally fix first lock member <NUM> relative to panel <NUM> when fastener assembly <NUM> is tightened against panel <NUM>. In alternative embodiments, first lock member <NUM> includes any anti-rotation features that enable first lock member <NUM> to function as described herein. For example, in some embodiments, first lock member <NUM> includes one or more axial or radial features such as engagement surfaces that constrain rotation of first lock member <NUM>.

In the exemplary embodiment, outer portion <NUM> includes an upper surface <NUM>, a lower surface <NUM>, and a radially outer surface <NUM> extending axially between upper surface <NUM> and lower surface <NUM>. Axially-extending teeth <NUM> extend upward from upper surface <NUM>. Specifically, axially-extending teeth <NUM> extend upward from upper surface <NUM> along an entire circumference of first lock member <NUM> and form a continuous ring. In the exemplary embodiment, each tooth <NUM> includes a sloped surface <NUM> and an engagement surface <NUM> extending in the axial direction. As a result, opposing teeth are able to travel over teeth <NUM> along sloped surface <NUM> in one circumferential direction but are prevented from traveling in the opposite direction by engagement surface <NUM>. Accordingly, teeth <NUM> are ratchet teeth that allow ratcheting movement of opposed teeth when the teeth are engaged. In alternative embodiments, outer portion <NUM> includes any teeth <NUM> that enable first lock member <NUM> to function as described herein.

<FIG> is a perspective view of second lock member <NUM> of fastener assembly <NUM> (shown in <FIG>). Second lock member <NUM> includes an annular body <NUM> and one or more spring fingers <NUM>. In the illustrated embodiment, annular body <NUM> has a ring-like shape. It is contemplated that annular body <NUM> may be round, oval, ellipsoid, or any other suitable shape, and may be constructed from a resilient material, such as an elastomer or spring steel. In response to a radial force exerted thereon by one or more spring fingers <NUM>, annular body <NUM> may become more or less round depending upon the amount of radial force exerted on annular body <NUM> and the spring constant of second lock member <NUM>.

In the exemplary embodiment, second lock member <NUM> includes a pair of spring fingers <NUM>. Each spring finger <NUM> extends axially from annular body <NUM> and extends between a proximal end <NUM> and a free end <NUM>. Proximal end <NUM> is joined to annular body <NUM>. Each spring finger <NUM> extends radially outward from proximal end <NUM> such that free end <NUM> is disposed radially outward of proximal end <NUM>. In the illustrated embodiment, spring fingers <NUM> extend from diametrically opposite sides of annular body <NUM>. Free ends <NUM> of spring fingers <NUM> are biased outward such that lock member <NUM> is in the lock position when no external forces act on lock member <NUM>, i.e., when lock member <NUM> is at rest. Free ends <NUM> define a maximum width of second lock member <NUM> when second lock member <NUM> is in a lock position. In alternative embodiments, second lock member <NUM> includes any spring finger <NUM> that enables second lock member <NUM> to function as described herein. For example, in some embodiments, second lock member <NUM> includes one spring finger <NUM> or three or more spring fingers <NUM>.

Also, in the exemplary embodiment, at least one axially-extending tooth <NUM> is disposed on free end <NUM> of each spring finger <NUM>. Each tooth <NUM> includes an engagement surface <NUM> and a sloped surface <NUM> that correspond to sloped surfaces <NUM> and engagement surfaces <NUM> of first lock member <NUM> (shown in <FIG>). In the illustrated embodiment, each free end <NUM> includes a plurality of teeth <NUM> that are configured to engage teeth <NUM> (shown in <FIG>) when fastener assembly <NUM> (shown in <FIG>) is in a lock configuration. In alternative embodiments, second lock member <NUM> includes any teeth <NUM> that enable second lock member <NUM> to function as described herein.

<FIG> is a perspective view of second lock member <NUM> in a laid flat configuration. In the exemplary embodiment, second lock member <NUM> is formed in the laid flat configuration from a sheet of material such as, for example and without limitation, steel, aluminum, titanium, or a superalloy. After forming the laid flat configuration, spring fingers <NUM> of second lock member <NUM> are bent at an angle relative to annular body <NUM> and positioned to extend axially from annular body <NUM>. Accordingly, second lock member <NUM> is able to be assembled using a stamping process at a reduced cost in comparison to at least some known lock members.

<FIG> is a perspective view of threaded member <NUM> of fastener assembly <NUM> (shown in <FIG>). Head portion <NUM> of threaded member <NUM> has a cavity <NUM> and is configured to receive second lock member <NUM> (shown in <FIG>) such that annular body <NUM> (shown in <FIG>) is positioned in cavity <NUM> and spring fingers <NUM> (shown in <FIG>) extend through slots <NUM>. Cavity <NUM> is circular and has a diameter greater than a diameter of annular body <NUM>. A circumferential lip <NUM> extends axially from a top of head portion <NUM> around cavity <NUM>. A collar <NUM> extends radially inward from lip <NUM> and is sized to extend at least partially over second lock member <NUM> (shown in <FIG>) to secure annular body <NUM> in cavity <NUM> when annular body <NUM> is positioned in cavity <NUM>. Second lock member <NUM> (shown in <FIG>) is at least partially compressible to allow positioning of second lock member <NUM> in cavity <NUM> through the opening defined by collar <NUM>. In alternative embodiments, second lock member <NUM> is coupled to threaded member <NUM> in any manner that enables fastener assembly <NUM> to function as described herein.

<FIG> is a perspective view of fastener assembly <NUM> and two components coupled together by fastener assembly <NUM>. <FIG> is a sectional view of the components and fastener assembly <NUM> with second lock member <NUM> in the lock position. Fastener assembly <NUM> is able to couple many types of components together. For example, fastener assembly <NUM> is used to couple panel <NUM> to a substrate <NUM>. Fastener assembly <NUM> is positioned through openings <NUM> in panel <NUM> and threaded into a threaded bore <NUM> of substrate <NUM> to secure panel <NUM> to substrate <NUM>. First lock member <NUM> engages anti-rotation structures, e.g., openings <NUM>, of panel <NUM> to prevent rotation of first lock member <NUM> relative to panel <NUM> as first lock member <NUM> is pressed against panel <NUM>. Fastener assembly <NUM> has a lock position that prevents loosening of fastener assembly <NUM> when fastener assembly <NUM> is tightened against panel <NUM>. For example, second lock member <NUM> is coupled to threaded member <NUM> for rotation therewith. Second lock member <NUM> is in the lock position in which second lock member <NUM> engages first lock member <NUM> to prevent rotation of second lock member <NUM> and threaded member <NUM> relative to first lock member <NUM>. Specifically, teeth <NUM> on spring fingers <NUM> engage teeth <NUM> of first lock member <NUM>. The engagement of teeth <NUM> and teeth <NUM> allow tightening of fastener assembly <NUM> in threaded bore <NUM> but prevent threaded member <NUM> from rotating in the opposite direction.

<FIG> is a sectional view of fastener assembly <NUM> coupling components <NUM>, <NUM> together and a tool <NUM> for positioning second lock member <NUM> in an unlock position. <FIG> is an enlarged perspective view of tool <NUM> engaging second lock member <NUM> and positioning second lock member <NUM> in the unlock position. Tool <NUM> includes a body <NUM> having a stepped bore <NUM> extending axially therethrough. Stepped bore <NUM> includes a cylindrical portion <NUM> and an engagement portion <NUM>. Stepped bore <NUM> has a diameter or width configured to receive fastener assembly <NUM> therein such that body <NUM> engages outer portions of second lock member <NUM>, as is described herein. Stepped bore <NUM> extends axially through body <NUM> a predetermined distance configured to facilitate receiving the entirety of fastener assembly <NUM> in stepped bore <NUM>. Engagement portion <NUM> of stepped bore <NUM> includes wrenching surfaces <NUM> extending from cylindrical portion <NUM> to a first end <NUM> of body <NUM>. Wrenching surfaces <NUM> correspond in shape and size to head portion <NUM> and are configured to engage head portion <NUM> of fastener assembly <NUM>. At a second end <NUM> of body <NUM>, stepped bore <NUM> includes a driver connection <NUM> for receiving driving torque from a driving member (not shown), such as a ratchet. In alternative embodiments, fastener assembly <NUM> is used with any tool <NUM> that enables fastener assembly <NUM> to operate as described herein. For example, in some embodiments, tool <NUM> includes bore <NUM> without a cylindrical portion <NUM>.

In addition, in the exemplary embodiment, tool <NUM> is arranged to engage second lock member <NUM> coupled to threaded member <NUM> when fastener assembly <NUM> is received in stepped bore <NUM>. For example, spring fingers <NUM> of second lock member <NUM> extend over and along sides of head portion <NUM> at least partially through slots <NUM> when annular body <NUM> is positioned in cavity <NUM>. The maximum width of second lock member <NUM> is greater than a width of head portion <NUM> such that free ends <NUM> of spring fingers <NUM> extend beyond the outer surface of head portion <NUM> when second lock member <NUM> is in the unlock position. Accordingly, tool <NUM> contacts free ends <NUM> when tool <NUM> is fitted over head portion <NUM>. Slots <NUM> are sized and shaped to allow displacement of spring fingers <NUM> radially inward of teeth <NUM> on first lock member <NUM> when body <NUM> of tool <NUM> contacts spring fingers <NUM> of second lock member <NUM>. Accordingly, tool <NUM> contacts outer surfaces of spring fingers <NUM> and displaces spring fingers <NUM> radially inward such that teeth <NUM> disengage from teeth <NUM>. In such a manner, tool <NUM> is used to position second lock member <NUM> in the unlock position which allows rotation of second lock member <NUM> and threaded member <NUM> relative to first lock member <NUM> and panel <NUM>.

<FIG> is a perspective view of an alternative exemplary embodiment of a fastener assembly <NUM>. <FIG> is an exploded perspective view of fastener assembly <NUM>. Fastener assembly <NUM> includes a first lock member <NUM>, a second lock member <NUM>, a threaded member <NUM>, and a nut <NUM>. Fastener assembly <NUM> is similar to fastener assembly <NUM> (shown in <FIG>) except fastener assembly <NUM> includes nut <NUM> that releasably couples to second lock member <NUM>.

In the exemplary embodiment, threaded member <NUM>, first lock member <NUM>, second lock member <NUM>, and nut <NUM> are fabricated from a metal, for example and without limitation, steel, aluminum, titanium, or a superalloy. Alternatively, threaded member <NUM>, first lock member <NUM>, second lock member <NUM>, and nut <NUM> are fabricated from any material that enables fastener assembly <NUM> to function as described herein, such as, without limitation, composite materials, resins, fiber reinforced resins, plastics, and fiber reinforced plastics.

<FIG> is a perspective view of first lock member <NUM> of fastener assembly <NUM> (shown in <FIG> and <FIG>). In the exemplary embodiment, first lock member <NUM> includes a plurality of axially-extending ratchet teeth <NUM> and a body <NUM> defining an aperture <NUM> extending therethrough. Body <NUM> has an inner circumferential surface <NUM>, an outer circumferential surface <NUM>, and an annular surface <NUM> extending between inner circumferential surface <NUM> and outer circumferential surface <NUM>. Axially-extending ratchet teeth <NUM> extend upward from annular surface <NUM>. Aperture <NUM> is sized to receive threaded member <NUM>. In alternative embodiments, fastener assembly <NUM> includes any first lock member <NUM> that enables fastener assembly <NUM> to function as described herein.

In addition, in the exemplary embodiment, first lock member <NUM> includes at least one anti-rotation feature configured to rotationally fix first lock member <NUM> with respect to threaded member <NUM> (shown in <FIG> and <FIG>). Anti-rotation features of first lock member <NUM> and threaded member <NUM> prevent rotation of first lock member <NUM> relative to threaded member <NUM>. Anti-rotation features include, for example and without limitation, flats, notches, grooves, slots, or any other feature that enables fastener assembly <NUM> to function as described herein. In the exemplary embodiment, the anti-rotation features on first lock member <NUM> include a flat or planar engagement area <NUM> formed in inner circumferential surface <NUM>. In alternative embodiments, fastener assembly <NUM> includes any anti-rotation feature that enables threaded member <NUM> to operate as described herein.

<FIG> is a perspective view of second lock member <NUM> of fastener assembly <NUM> (shown in <FIG> and <FIG>). Second lock member <NUM> is configured to couple to nut <NUM> (shown in <FIG> and <FIG>) for rotation therewith. In addition, second lock member <NUM> is configured to engage first lock member <NUM> (shown in <FIG>) when second lock member <NUM> is in a lock position. Second lock member <NUM> includes a base portion <NUM> and at least one spring finger <NUM> extending axially from base portion <NUM>. In the exemplary embodiment, base portion <NUM> of second lock member <NUM> comprises an annular ring. In alternative embodiments, second lock member <NUM> includes any base portion <NUM> that enables fastener assembly <NUM> to function as described herein.

Also, in the exemplary embodiment, second lock member <NUM> includes diametrically opposed spring fingers <NUM> extending axially from opposite sides of base portion <NUM>. Each spring finger <NUM> has a proximal end <NUM> joined to base portion <NUM> and a free end <NUM> opposite proximal end <NUM>. Each free end <NUM> includes a plurality of axially-extending teeth <NUM>. Second lock member <NUM> has a lock position in which teeth <NUM> on free end <NUM> of each spring finger <NUM> are configured to engage axially-extending ratchet teeth <NUM> on first lock member <NUM> (shown in <FIG>) and an unlock position in which free ends <NUM> are spaced from ratchet teeth <NUM>. In the exemplary embodiment, second lock member <NUM> is a single piece. In alternative embodiments, fastener assembly <NUM> includes any second lock member <NUM> that enables fastener assembly <NUM> to function as described herein. For example, in some embodiments, spring fingers <NUM> are one or more separate pieces coupled to base portion <NUM>.

<FIG> is a perspective view of nut <NUM> of fastener assembly <NUM> (shown in <FIG> and <FIG>). In the exemplary embodiment, nut <NUM> is a hexagonal nut and is rotatable using a tool such as a wrench. In alternative embodiments, fastener assembly <NUM> includes any nut <NUM> that enables fastener assembly <NUM> to operate as described herein.

In the exemplary embodiment, nut <NUM> is configured to releasably couple to second lock member <NUM> (shown in <FIG>). Nut <NUM> includes an upper surface <NUM>, a lower surface <NUM> opposite upper surface <NUM>, and a circumferential surface <NUM> extending between upper surface <NUM> and lower surface <NUM>. A threaded bore <NUM> is defined in nut <NUM> and extends along a central axis <NUM> of nut <NUM> from lower surface <NUM> to upper surface <NUM>. Threaded bore <NUM> is configured to engage threaded member <NUM> such that nut <NUM> is able to be threaded on threaded member <NUM>.

Also, in the exemplary embodiment, circumferential surface <NUM> has at least one axially-extending slot <NUM> defined therein. In the exemplary embodiment, a pair of diametrically opposite slots <NUM> are defined by circumferential surface <NUM> and are arranged to receive spring fingers <NUM> (shown in <FIG>). In addition, slots <NUM> are configured to at least partially engage spring fingers <NUM> to fix rotation of second lock member <NUM> relative to nut <NUM> when second lock member <NUM> is coupled to nut <NUM>.

In addition, in the exemplary embodiment, nut <NUM> defines a cavity <NUM> sized to receive base portion <NUM> of second lock member <NUM> (shown in <FIG>). Nut includes a lip <NUM> that extends axially outward from upper surface <NUM> and at least partially around cavity <NUM>. A collar <NUM> extends radially inward from lip <NUM> to retain base portion <NUM> of second lock member <NUM> in cavity <NUM>. Lip <NUM> includes notches <NUM> aligned with slots <NUM> and sized to receive spring fingers <NUM> (shown in <FIG>). Notches <NUM> allow spring fingers <NUM> to extend into slots <NUM>. Accordingly, second lock member <NUM> (shown in <FIG>) is configured to couple to nut <NUM> such that base portion <NUM> is positioned in cavity <NUM> and spring fingers <NUM> extend at least partially through slots <NUM>. In alternative embodiments, second lock member <NUM> couples to nut <NUM> in any manner that enables fastener assembly <NUM> to function as described herein.

<FIG> is a sectional view of tool <NUM> and fastener assembly <NUM> with second lock member <NUM> in the lock position. In the lock position, second lock member <NUM> is coupled to nut <NUM> and second lock member <NUM> engages first lock member <NUM> to prevent rotation of second lock member <NUM> and threaded member <NUM> relative to first lock member <NUM>. Specifically, teeth <NUM> on spring fingers <NUM> engage teeth <NUM> of first lock member <NUM>. The ratcheting engagement of teeth <NUM> and teeth <NUM> allow rotation of nut <NUM> to tighten nut <NUM> on threaded member <NUM> and prevent rotation of nut <NUM> in the opposite direction when teeth <NUM> are positioned to engage teeth <NUM>.

<FIG> is a sectional view of tool <NUM> and fastener assembly <NUM> with second lock member <NUM> in an unlock position. <FIG> is an enlarged perspective view of tool <NUM> engaging second lock member <NUM> and positioning second lock member <NUM> in the unlock position. Tool <NUM> is configured to switch fastener assembly <NUM> between the lock position and the unlock position. Tool <NUM> is usable with both fastener assembly <NUM> (shown in <FIG> and <FIG>) and fastener assembly <NUM> because tool <NUM>, fastener assembly <NUM>, and fastener assembly <NUM> include structures having similar sizes and shapes. Accordingly, fastener assembly <NUM> and fastener assembly <NUM> do not required tools having custom dimensions or features for unlocking. In alternative embodiments, fastener assembly <NUM> is unlocked using any tool <NUM> that enables fastener assembly to operate as described herein.

In addition, in the exemplary embodiment, stepped bore <NUM> of tool <NUM> is sized to receive fastener assembly <NUM> such that body <NUM> of tool <NUM> extends around and engages second lock member <NUM> coupled to threaded member <NUM>. For example, spring fingers <NUM> of second lock member <NUM> extend over and along sides of nut <NUM> and at least partially through slots <NUM> when base portion <NUM> is positioned in cavity <NUM>. The maximum width of second lock member <NUM> is greater than a width of nut <NUM> such that free ends <NUM> of spring fingers <NUM> extend beyond the outer surface of nut <NUM>. Accordingly, tool <NUM> contacts free ends <NUM> when tool <NUM> is fitted over nut <NUM>. Slots <NUM> are sized and shaped to allow displacement of spring fingers <NUM> radially inward of teeth <NUM> on first lock member <NUM> when body <NUM> of tool <NUM> contacts spring fingers <NUM> of second lock member <NUM>. For example, tool <NUM> contacts outer surfaces of spring fingers <NUM> and displaces spring fingers <NUM> radially inward such that teeth <NUM> disengage from teeth <NUM> when tool <NUM> is positioned over fastener assembly <NUM>. Accordingly, tool <NUM> is arranged to position second lock member <NUM> in the unlock position which allows rotation of second lock member <NUM> and nut <NUM> relative to threaded member <NUM>.

<FIG> is a perspective view of an exemplary embodiment of a fastener assembly <NUM> not forming part of the invention. <FIG> is a side view of fastener assembly <NUM>. Fastener assembly <NUM> includes a first lock member <NUM>, a second lock member <NUM>, and a threaded member <NUM>. Fastener assembly <NUM> is similar to fastener assembly <NUM> (shown in <FIG>) except second lock member <NUM> of fastener assembly <NUM> is in the form of a lock washer.

In the exemplary embodiment not forming part of the invention, threaded member <NUM>, first lock member <NUM>, and second lock member <NUM> are fabricated from a metal, for example and without limitation, steel, aluminum, titanium, or a superalloy. Alternatively, threaded member <NUM>, first lock member <NUM>, and second lock member <NUM> are fabricated from any material that enables fastener assembly <NUM> to function as described herein, such as, without limitation, composite materials, resins, fiber reinforced resins, plastics, and fiber reinforced plastics.

<FIG> is a top view of a portion of fastener assembly <NUM> with a head portion of threaded member <NUM> removed to allow illustration of first lock member <NUM> engaging second lock member <NUM>. First lock member <NUM> is configured to engage threaded member <NUM> for rotation therewith. Second lock member <NUM> is configured to engage first lock member <NUM> to prevent rotation of first lock member <NUM> and threaded member <NUM> when second lock member <NUM> is in the lock position. In addition, second lock member <NUM> is positionable in an unlock position to allow rotation of first lock member <NUM> and threaded member <NUM> relative to second lock member <NUM>.

<FIG> is a perspective view of second lock member <NUM> of fastener assembly <NUM> (shown in <FIG>). Second lock member <NUM> includes an inner portion <NUM>, an outer portion <NUM>, and a base portion <NUM>. In the exemplary embodiment not forming part of the invention, inner portion <NUM> and outer portion <NUM> are formed as a single piece. Base portion <NUM> is configured to couple to inner portion <NUM> and outer portion <NUM>. Specifically, second lock member <NUM> includes a plurality of engagement features, e.g., pins <NUM>, that retain inner portion <NUM>, outer portion <NUM>, and base portion <NUM> together for conjoint rotation. In alternative embodiments, base portion <NUM> is coupled to outer portion <NUM> or inner portion <NUM> in any manner that enables second lock member <NUM> to function as described herein. For example, in some embodiments, base portion <NUM> is permanently attached to inner portion <NUM>. In further embodiments, inner portion <NUM>, outer portion <NUM>, and base portion <NUM> are integrally formed and second lock member <NUM> is a single piece.

<FIG> is a perspective view of a portion of second lock member <NUM>. Inner portion <NUM> defines an aperture <NUM> extending therethrough. Aperture <NUM> is sized to receive threaded member <NUM>. Outer portion <NUM> includes at least one tab <NUM> extending circumferentially about and axially from inner portion <NUM>. In the exemplary embodiment not forming part of the invention, outer portion <NUM> includes a pair of diametrically opposite tabs <NUM>. Each tab <NUM> has a proximal end <NUM> joined to inner portion <NUM> and a free end <NUM> opposite proximal end <NUM>. Each free end <NUM> includes a plurality of radially-extending teeth <NUM>. In addition, each tab <NUM> includes bends <NUM> between proximal end <NUM> and free end <NUM>. Bends <NUM> are configured such that radially-extending teeth <NUM> on free ends <NUM> of tabs extend radially inward toward first lock member <NUM>. For example, each bend <NUM> defines an angle of 45o or greater. In alternative embodiments, second lock member <NUM> includes any tab <NUM> that enables second lock member <NUM> to function as described herein.

<FIG> is a perspective view of base portion <NUM> of second lock member <NUM>. Base portion <NUM> includes an annular body <NUM> defining an aperture <NUM> sized to receive threaded member <NUM> (shown in <FIG>). Aperture <NUM> is aligned with aperture <NUM> (shown in <FIG>) when base portion <NUM> is coupled to inner portion <NUM>. Base portion <NUM> includes a plurality of pins <NUM> that are received in openings in inner portion <NUM> to couple base portion <NUM> to inner portion <NUM> and outer portion <NUM>. In addition, base portion <NUM> includes at least one anti-rotation structure configured to engage components, such as components <NUM> (shown in <FIG>), and restrict movement of second lock member <NUM> relative to the components. In the exemplary embodiment not forming part of the invention, anti-rotation structures include pins <NUM> that extend axially from a lower surface of base portion <NUM>.

<FIG> is a perspective view of first lock member <NUM> of fastener assembly <NUM>. First lock member <NUM> includes a body <NUM> having an inner circumferential surface <NUM>, an outer circumferential surface <NUM>, and opposed annular surfaces <NUM> extending between inner circumferential surface <NUM> and outer circumferential surface <NUM>. Inner circumferential surface <NUM> defines an aperture <NUM> extending through body <NUM> and sized to receive threaded member <NUM> (shown in <FIG>). In addition, first lock member <NUM> includes a plurality of radially-extending ratchet teeth <NUM> extending radially outward from outer circumferential surface <NUM>. Ratchet teeth <NUM> are configured to engage radially-extending teeth <NUM> when second lock member <NUM> is in the lock position.

In addition, in the exemplary embodiment not forming part of the invention, first lock member <NUM> includes at least one anti-rotation feature configured to rotationally fix first lock member <NUM> with respect to threaded member <NUM> (shown in <FIG>). Anti-rotation features include, for example and without limitation, flats, notches, grooves, slots, or any other feature that enables fastener assembly <NUM> to function as described herein. In the exemplary embodiment not forming part of the invention, anti-rotation features include a flat or planar engagement area <NUM> formed in inner circumferential surface <NUM>. In alternative embodiments, fastener assembly <NUM> includes any anti-rotation features that enable fastener assembly <NUM> to operate as described herein.

<FIG> is a perspective view of threaded member <NUM> of fastener assembly <NUM>. Threaded member <NUM> includes a head portion <NUM> and an elongated threaded body portion <NUM> extending axially from head portion <NUM>. Alternatively, threaded member <NUM> may be free of head portion <NUM>. For example and without limitation, threaded member <NUM> may be a threaded rod, a bolt, a screw, or any other threaded component that enables fastener assembly <NUM> to function as described herein.

In the exemplary embodiment not forming part of the invention, head portion <NUM> is a hexagonal head. Alternatively, head portion <NUM> is any form, for example and without limitation, a spline head, a socket cap, a tulip head, and a pan head, that enables fastener assembly <NUM> to function as described herein.

In the exemplary embodiment not forming part of the invention, threaded member <NUM> includes at least one anti-rotation feature to prevent rotation of first lock member <NUM> relative to threaded member <NUM> when first lock member <NUM> is positioned on threaded body portion <NUM>. Anti-rotation features include, for example and without limitation, flats, notches, grooves, slots, or any other feature that enables threaded member <NUM> to function as described herein. In the exemplary embodiment not forming part of the invention, anti-rotation features include a flat or planar engagement area <NUM> formed on threaded body portion <NUM>. In alternative embodiments, threaded member <NUM> includes any anti-rotation features that enable threaded member <NUM> to operate as described herein.

<FIG> is a perspective view of components <NUM> coupled together using fastener assembly <NUM>. <FIG> is a sectional view of components <NUM> coupled together using fastener assembly <NUM> with second lock member <NUM> of fastener assembly <NUM> in a lock position. In the lock position, free ends <NUM> of tabs <NUM> are spaced axially from inner portion <NUM> and radially-extending teeth <NUM> are configured to engage ratchet teeth <NUM> of first lock member <NUM>. Accordingly, first lock member <NUM> and threaded member <NUM> are prevented from rotating relative to second lock member <NUM>. In addition, pins <NUM> engage components <NUM> to prevent rotation or loosening of fastener assembly <NUM> relative to components <NUM> when fastener assembly <NUM> is in the lock configuration.

<FIG> is a sectional view of components <NUM> coupled together using fastener assembly <NUM> with second lock member <NUM> of fastener assembly <NUM> in an unlock position. In the exemplary embodiment not forming part of the invention, a stepped bore <NUM> of a tool <NUM> is sized to receive fastener assembly <NUM> such that a body <NUM> of tool <NUM> extends around and engages second lock member <NUM> coupled to threaded member <NUM>. For example, tabs <NUM> of second lock member <NUM> extend beyond first lock member <NUM> because the maximum width of second lock member <NUM> is greater than a width of first lock member <NUM>. Accordingly, tool <NUM> contacts tabs <NUM> and displaces tabs <NUM> axially when tool <NUM> is fitted over fastener assembly <NUM>. Tool <NUM> contacts and displaces tabs <NUM> an axial distance such that teeth <NUM> disengage from teeth <NUM>. Accordingly, tool <NUM> is configured to position second lock member <NUM> in the unlock position and allow rotation of first lock member <NUM> and threaded member <NUM> relative to second lock member <NUM> and components <NUM>.

In some embodiments, the first and/or the second lock member are formed using an injection molding process from molded materials such as plastics. For example, in some embodiments, the moldable plastic materials are injecting into a mold during a multi-shot injection molding process and each component is formed as a single piece.

In some embodiments, the first or second lock member may be formed as two or more separate components. For example, in some embodiments, one or more of the lock members includes a base portion and an upper portion. The upper portion may be rigidly fixed to the base portion by a plurality of connection tabs or in any other suitable manner. The base portion and upper portion can be joined by clinching, welding and/or by rivets. At least one arm may extend from the upper portion and be configured to engage a lock nut and/or lock member. In addition, in some embodiments, at least one arm includes at least one vertical bend in the vertical or axial direction such that edge teeth are in a different plane than base portion and/or the upper portion. In further embodiments, the arms may include one or more 45o bends. As a result, the lock member provides a higher locking torque. In addition, the lock member may have areas of differing thickness to provide increased strength or sturdiness such as in the base. Also, the different components may have different dimensions. For example, the base member diameter can be larger without affecting the locking mechanism's diameter. In alternative embodiments, the lock members may include any number of pieces that enable the lock member to function as described herein, including, for example and without limitation, a single piece design.

In some embodiments, the fastener assemblies are assembled as a captive fastener assembly in which the threaded member, nut, and/or lock member(s) are coupled together and provided to a user as a single assembly. In such embodiments, the captive fastener assembly is ready for installation as a single unit without requiring additional components. Accordingly, the captive configuration simplifies installation and removal of the fastener assembly and reduces opportunities for damage by foreign objects.

The components as described herein provide locking and vibration resistant fastener assemblies. For example, as described in the embodiments herein, when the tool is removed from the associated fastener assembly, teeth on the first lock member again engage the locking apertures/teeth of the respective lock member. When the teeth are engaged, the lock member is positively locked in rotation due to the rotational locking relationship of the lock member to a component such as a panel. When the teeth are disengaged from the locking apertures/teeth, the lock member is a rotationally free relative to the engagement surface. In addition, the arrangements shown in the figures facilitate preventing over deflection of the lock members in response to the force "F" applied by tool.

Exemplary embodiments of systems and methods for rotationally locked fastener assemblies are described above. The systems and methods are not limited to the specific embodiments described herein but, rather, components of the systems and/or operations of the methods may be utilized independently and separately from other components and/or operations described herein. Further, the described components and/or operations may also be defined in, or used in combination with, other systems, methods, and/or devices, and are not limited to practice with only the systems described herein.

The fastening device technology described herein has unlimited application in industry and other uses. Particularly advantageous applications will involve use near motors or moving equipment in which severe vibration may cause loosening of traditional fasteners such as in automotive applications, aerospace applications, military applications, road and construction applications, oil and gas, and manufacturing machinery. The present fastening device technology is also well suited for medical applications such as attaching pedicle screws to spinal rods, attaching spinal plates and fracture plates, fixing artificial joints, like hips and knees, orthopedic and maxillofacial external fixator systems, and the like. In particular, those skilled in the art will readily appreciate that embodiments of the fastening device technology described herein can withstand high temperature applications, for example, they can withstand temperatures as high as the material they are fabricated from can tolerate, and are easily applied, removed and reused. In addition, it is contemplated that the tightening of a nut number on a threaded member can be blind. For example, instead of the head portions, flats defined on the threaded member can be held or otherwise fixed during tightening.

In addition, some embodiments described herein provide adjustable diameter locking and vibration resistant fastener assemblies. For example, as described in the embodiments herein, when a tool is removed from the associated fastener assembly, teeth on the lock member engage the notches or ratchet teeth of the respective engagement surface. When the teeth are engaged, the lock member is rotationally locked due to the rotational locking relationship of the lock member to the lock member. When the tool is applied to the lock member, at least a portion of the lock member is displaced radially or axially to disengage the teeth from the ratchet teeth. When the teeth are disengaged from the ratchet teeth, the lock member is rotationally free relative to the engagement surface.

Although specific features of various embodiments of the invention may be shown in some drawings and not in others, this is for convenience only. In accordance with the principles of the invention, any feature of a drawing may be referenced and/or claimed in combination with any feature of any other drawing.

Claim 1:
A fastener assembly (<NUM>) comprising:
a threaded member (<NUM>) comprising a threaded body portion (<NUM>) extending along an axis (<NUM>) and a head portion (<NUM>);
a first lock member (<NUM>) including a plurality of ratchet teeth (<NUM>) and defining an aperture (<NUM>) extending therethrough, the aperture sized to receive said threaded body portion, wherein the ratchet teeth extend from the first lock member in a direction parallel to the axis; and
a second lock member (<NUM>) comprising:
a base portion (<NUM>); and
at least one spring finger (<NUM>) extending axially from said base portion, said at least one spring finger having a proximal end (<NUM>) joined to said base portion and a free end (<NUM>) opposite said proximal end, wherein said second lock member has a lock position in which said free end of said at least one spring finger is configured to engage said plurality of ratchet teeth and an unlock position in which said free end of said at least one spring finger is spaced from said plurality of ratchet teeth, wherein said at least one spring finger is displaceable radially inward relative to the axis of said threaded body portion to switch said second lock member from the lock position to the unlock position and disengage said at least one spring finger from said plurality of ratchet teeth,
characterized in that said head portion of said threaded member is configured to receive said second lock member and includes a flange (<NUM>) configured to engage said base portion of said second lock member.