Patent Description:
Many manufacturing fields use fasteners, such as blind fasteners, for securing two objects to one another when, for example, only one side of a joint is accessible. The aerospace and other industries utilize blind fasteners in a variety of manufacturing capacities such as fuselage manufacture, floor panel assembly, and the like. Previous blind fastener designs include rods that thread into collets with clamping feet radially expanded by the rods. When expanded, the clamping feet slide under a lower workpiece and act as a lower clamping arm, while, for example, a surface in the body of the fastener, acts as an upper clamping arm that engages an upper workpiece.

However, the inventor has recognized several drawbacks with previous removable fasteners. For instance, in certain types of fasteners, as the fastener's grip length is decreased, the collet retracts into a housing but the rod protrudes from the distal end of the collet and in some cases the rod's position may remain relatively stationary with regard to the housing. Consequently, prior fasteners may pose installation challenges in spaced constrained environments. The inventor has also recognized drawbacks in other fasteners with regard to fastener packaging and load carrying capabilities.

Reference <CIT> discloses a fastener in agreement with the preamble of instant claim <NUM>.

Facing the aforementioned challenges, the inventor developed a fastener to a least partially overcome some of the challenges. In one example, the fastener includes a block fixedly coupled to an interior spindle and mated with a slot in a threaded retaining spindle. The fastener further includes a drive nut engaged with the threaded retaining spindle. The fastener also includes an unthreaded collet coupled to the threaded retaining spindle and including a plurality of flexible legs each including a clamping foot. The fastener even further includes a body that circumferentially surrounds the block and the threaded retaining spindle. The block, the body, and the threaded retaining spindle of the fastener are configured to axially translate in relation to one another and are substantially prevented from rotation in relation to one another, during different stages of fastener operation. In this way, the fastener can achieve a "double" axial translation and anti-rotation functionality. The "double" axial translation and anti-rotation functionality can allow the fastener's overall length to be decreased as its grip length is decreased. The compactness of the fastener is increased as a result, allowing the fastener to be deployed in more space constrained environments, if desired.

In one example, the unthreaded collet may be axially captured in the slot in the threaded retaining spindle. In this way, the unthreaded collet may be positioned in a desired axial location and axial load may be transferred through the unthreaded collet to the threaded retaining spindle.

Further, in one example, in an initial stage of clamp-up, rotation of the drive unit in a first direction by a first amount drives the threaded retaining spindle in an axial direction. In one example, the threaded retaining spindle may be rotationally constrained by the cooperation of inner surfaces of the body and exterior surfaces of the block, and by the block being axially mated within the slot of the threaded retaining spindle. Translation of threaded retaining spindle in relation to the unthreaded collet to urge clamping feet of the unthreaded collet outward into a "clamping" configuration.

In such an example, once the clamping feet are in the "clamping" configuration, additional rotation of the drive nut in the first direction causes the block, interior spindle, and threaded retaining spindle to axially retract into the body in unison. Consequently, the interior spindle can be drawn into the body of the fastener once the clamping feet have been expanded, thereby increasing the fastener's space efficiency.

It should be understood that the summary above is provided to introduce in simplified form a selection of concepts that are further described in the detailed description. It is not meant to identify key or essential features of the claimed subject matter, the scope of which is defined uniquely by the claims that follow the detailed description. Furthermore, the claimed subject matter is not limited to implementations that solve any disadvantages noted above or in any part of this disclosure.

The present disclosure will be better understood from reading the following description of non-limiting embodiments, with reference to the attached drawings, wherein below:.

The following description relates to a removable fastener with an unthreaded collet that may be used secure two objects to one another, more specifically the fastener may be used to secure the two objects to one another when only one side of the joint is accessible (e.g., the fastener may be used as a blind fastener). In one example, the fastener may include a block coupled to an interior spindle (e.g., center spindle), a threaded retaining spindle that has a slot which retains the unthreaded collet, and a body. In such an example, the block, interior spindle, and threaded retaining spindle are designed with "double" axial translation and anti-rotation functionality, allowing the components to axially translate in relation to one another while rotation between the block and the threaded retaining spindle is substantially prevented, during different stages of clamping/unclamping in the fastener. In other words, the block, the body, and the threaded retaining spindle of the fastener are configured to axially translate in relation to one another and are substantially prevented from rotation in relation to one another, during different stages of fastener operation. The "double" axial translation/anti-rotation feature allows the fastener's overall length to be decreased as its grip length is varied during clamping, increasing the fastener's space efficiency. Other features, aspects, and advantages of the fastener will become apparent in the following description.

In one example, in an initial stage of clamp-up, rotation of the drive nut threadingly drives the threaded retaining spindle in an axial direction. Further, in the initial clamp-up stage, the threaded retaining spindle may be rotationally constrained by the cooperation of the inner surfaces of the body and exterior surfaces of the block, and by the block being axially mated within the slot of the threaded retaining spindle. Additionally, the centerline alignment may be facilitated by the cooperating surfaces of said features and also by an interior spindle that may be fixed center. To elaborate, rotation of the drive nut in a first direction by a first rotational amount causes a corresponding axial translation of the threaded retaining spindle and the collet trapped within by a first axial translation amount. A spring (surrounding the threaded retaining spindle) located between the drive nut and the block may urge the block against its resting stop throughout the threaded retaining spindle's first axial translation. The threaded retaining spindle may axially translate with respect to the block as the slot of the threaded retaining spindle may be sized to accommodate the size of the block and the first axial translation. Fixedly linked to the block may be the center spindle. The center spindle may fit within corresponding center holes in the threaded retaining spindle and collet. As the block is urged to maintain its first position throughout the threaded retaining spindles first axial motion, the center spindle may maintain its original position. As the threaded center spindle is axially drawn throughout its first axial motion, the collet may be held therein. In such a construct, the collet via the connection to the threaded retaining spindle may be pulled over the center spindle which may be held stationary via its connection to the block. As such, the sizing of these interacting components can facilitate the fingers of the collet being fully opened by the center spindle at the end of the threaded retaining spindle's first axial translation. Additionally, the sizing of these interacting components may be such that once the collet legs are fully opened, the block may axially engage with the threaded retaining spindle and begin to axially transverse up the body (overpowering the urging of the spring and thus compressing the spring). However, other spring designs have been contemplated.

<FIG> is an exploded view of an example fastener according to the embodiments disclosed herein. <FIG> and <FIG> depict different stages of assembly of the fastener. <FIG> show different views of the assembled components of <FIG> and <FIG>. <FIG> show different views of the assembled components of <FIG> and <FIG> partially inserted into a portion of a body of the fastener. <FIG> depicts a cross-sectional view of the assembled fastener. Cross-sectional views of the fastener in a "ready to install" configuration are shown in <FIG> and <FIG>. Cross-sectional views of the fastener in a "ready to clamp" configuration are shown in <FIG> and <FIG>. Cross-sectional views of the fastener in a "clamped" configuration are shown in <FIG> and <FIG>. <FIG> depict the fastener clamping two objects together. <FIG> is a flow chart of a method for operating the fastener according to the embodiments disclosed herein.

A set of reference axes <NUM> are provided in <FIG> for comparison between views shown, indicating a y-axis, a z-axis, and an x-axis. In some examples, the y-axis may be a vertical axis (e.g., parallel to a gravitational axis) and the z-axis may be a lateral axis. However, the axes may have other orientations, in other examples.

Turning now to <FIG>, an exploded side view of components of an example fastener <NUM> according to the embodiments disclosed herein is illustrated. The function of these components of the fastener <NUM> is described in further detail with respect to <FIG>, with <FIG> depicting how the components are assembled within the fastener <NUM>. The fastener <NUM> includes a body (see <FIG>) that houses the internal components of the fastener <NUM>. In some embodiments, the body may be an assembly comprised of a first end cap <NUM>, a center section <NUM>, and a second end cap <NUM>. The center section <NUM> of the body may be a hollow tube-like structure comprised of two outer portions that have different diameters. A first outer portion <NUM> may include a first section <NUM> that may extend from a first end <NUM> of the center section. A second outer portion <NUM> may include a second section <NUM> that extends from a second end <NUM> of the center section <NUM> and terminates at a point <NUM> in face-sharing contact with the first section <NUM>. A diameter <NUM> of the first outer portion <NUM> may be smaller than a diameter <NUM> of the second outer portion <NUM>. The interior cavity of the center section <NUM> may have one diameter that spans the length of the center section <NUM> (e.g., the internal cavity may have the same dimensions in both the first and second sections of the center section <NUM>). The interior cavity may be of suitable dimensions where a tubed portion <NUM> of the second end cap <NUM> may be inserted into the second section <NUM> of the center section <NUM> at the second end <NUM> so that the outer edges of a top <NUM> of the second end cap <NUM> may be in flush, face-sharing contact with the second end <NUM> after insertion.

The outer dimensions of the first end cap <NUM> designed to mate with an interior opening of the center section <NUM>, in one example. To elaborate, in some instances, the first end cap <NUM> may be of suitable dimensions where the first end <NUM> of the center section <NUM> may be inserted into a first face <NUM> of the first end cap <NUM> so that the first section <NUM> of the center section <NUM> is housed within the first end cap <NUM> and the first face <NUM> is in flush, face-sharing contact with the second outer portion <NUM> of the center section <NUM>. However, other configurations of the fastener body have been contemplated. In some embodiments, the internal components of the fastener <NUM> may be assembled (as further described with respect to <FIG> and <FIG>) and inserted within the interior cavity of the center section <NUM> of the body and the two end caps (e.g., the first end cap <NUM> and the second end cap <NUM>) may be mechanically grounded to the center section <NUM> so that both ends of the body of the fastener <NUM> are sealed. For example, the first end cap <NUM> may be mechanically grounded to the first end <NUM> of the center section <NUM> and the second end cap <NUM> may be mechanically grounded to the second end <NUM>.

In other embodiments, the body assembly may not include the first end cap <NUM>. For example, the first end cap <NUM> and the center section <NUM> may be jointly constructed (e.g., constructed as a monolithic structure). Further, in some examples, the center section <NUM> may be enlarged (e.g., to accommodate the internal components of the fastener <NUM>) and constructed (e.g., cast (die cast), machined, etc.) to include a cap on the first end <NUM> so that the body assembly may include the capped center section and the second end cap <NUM>. The end cap <NUM> may be a monolithic structure that may be die cast, for instance. In one example, the center section <NUM> may be die cast with all of the internal and external features in place, then the interior components may be installed, and then the end of the center section <NUM> may be swaged to capture the interior fastener components. A retaining ring may be added to the proximal end of the capped center section (e.g., within the interior cavity of the center section <NUM> just inside of the first end <NUM>) so that the internal components of the fastener may be held in a secured position. In additional embodiments, the center section <NUM> of the body may be enlarged to accommodate the internal components of the fastener <NUM> and the first end <NUM> deformed to secure the components in position at final assembly, thus eliminating the need for a proximal cap or a proximal retaining ring, if wanted. In some embodiments, the body of the fastener <NUM> may be constructed out of a metal such as steel, aluminum, titanium, etc. However, in other embodiments, the body may be constructed out of a polymer or a combination of materials.

In addition to housing the first section <NUM> of the center section <NUM>, the inner cavity of the first end cap <NUM> may be of suitable dimensions to accommodate a drive nut <NUM>. The drive nut <NUM> may include a shaft <NUM> fixedly attached to a first surface <NUM> of a section <NUM>. The threaded internal surface of the drive nut <NUM> may accommodate a threaded portion <NUM> of a threaded retaining spindle <NUM>. The threaded retaining spindle <NUM> may further include a non-threaded portion <NUM> that contains a first slot <NUM> and a second slot <NUM>. The first slot <NUM> and the second slot <NUM> may be of suitable dimensions to accommodate the lateral insertion (e.g., parallel to the z-axis) of a block <NUM> and an enlarged head <NUM> as well as a portion of a shank <NUM> of an unthreaded collet <NUM>, respectively. The slots <NUM> and <NUM>, block <NUM>, and unthreaded collet <NUM> are shown and described in further detail with respect to <FIG> and <FIG>. The threaded retaining spindle may include an opening <NUM>, shown in <FIG>, configured to mate with an unthreaded interior spindle described in greater detail herein. The opening <NUM> may axially extend through the threaded retaining spindle <NUM> at a first face <NUM> located on the non-threaded portion <NUM> and terminate within the threaded portion <NUM> (see at least <FIG>). The opening <NUM> may be of suitable dimensions to accommodate an unthreaded interior spindle <NUM> that may be inserted into and through the unthreaded collet <NUM> as further described below.

Continuing with <FIG>, the fastener <NUM> may include a first washer <NUM> be positioned around the shaft <NUM> of the drive nut <NUM> (e.g., the diameter of an inner aperture of the first washer may be larger than the outer diameter of the shaft <NUM>). The fastener <NUM> may include a second washer <NUM> adjacent to a second face <NUM> on the section <NUM> of the drive nut <NUM> and an inner aperture may accommodate the threaded retaining spindle <NUM>. The fastener <NUM> may further include a free-spin spring <NUM> and a spreader spring <NUM>. The spreader spring <NUM> may fit in the space existing between the internal faces of the body and the external faces of the threaded retaining spindle <NUM> and pushes on one end against the drive nut <NUM> (or the washer next to the drive nut) and on the other end against the top or proximal end of the block <NUM>. As shown in <FIG>, the outer edges of the block <NUM> may directly interact with the internal faces of the body such that no spring may slip past. Further, as shown in <FIG> the spreader spring <NUM> may touch the drive nut <NUM> or the washer <NUM> on one end and on the other end located at the top or proximal end of the block <NUM>.

In an initial portion of fastener clamp-up, rotation of the drive nut <NUM> in a first direction by a first rotational amount may cause a corresponding axial translation of the threaded retaining spindle <NUM> and the collet <NUM> which may be trapped within by a first axial translation amount. The spreader spring <NUM> (surrounding the threaded retaining spindle) located between the drive nut <NUM> and the block may urge the block against its resting stop throughout the threaded retaining spindle's first axial translation.

Turning now to <FIG>, a view of three different stages during the assembly of the fastener <NUM> of <FIG>. A first assembly stage <NUM> shows how the block <NUM> and the unthreaded collet <NUM> may be laterally inserted into the threaded retaining spindle <NUM>. A second assembly stage <NUM> shows how the interior spindle <NUM> may be inserted into the threaded retaining spindle <NUM> after lateral insertion of the block <NUM> and the unthreaded collet <NUM>. A third assembly stage <NUM> shows the threaded retaining spindle <NUM>, the unthreaded collet <NUM>, the block <NUM>, and the interior spindle <NUM> in an assembled configuration (as shown in <FIG>). The block <NUM> may be symmetrically shaped with two beveled sides (a first side <NUM> and a second side <NUM>). A first aperture <NUM> may laterally (e.g., parallel to the z-axis) traverse the block <NUM> through the middle of the first side <NUM> and the second side <NUM>. A second aperture <NUM> may traverse the center of the block <NUM> through a third side <NUM> and a fourth side <NUM>. The first aperture <NUM> and/or second aperture <NUM> may be configured as lateral access slots. The access slot may have a deformed (e.g., bent) portion of the spindle <NUM> residing therein, which is discussed in greater detail herein.

The block <NUM> may be configured for lateral insertion into the first slot <NUM> of the threaded retaining spindle <NUM>. To elaborate, the block <NUM> may be inserted into the first slot <NUM> until the second aperture <NUM> is aligned with a central axis (in the opening of the threaded retaining spindle <NUM>. The length (e.g., parallel to the Y-axis) of the block <NUM> may be less than the length of the first slot <NUM> of the threaded retaining spindle <NUM> to allow axial translation therein. The width (e.g., parallel to the z-axis) of the block <NUM> may be greater than the diameter of the threaded retaining spindle <NUM> where, after insertion, the beveled sides may extend laterally beyond the outer perimeter of the threaded retaining spindle <NUM> (e.g., the sides <NUM> and <NUM> (e.g., beveled sides) of the block <NUM> as well as a portion of the side surfaces <NUM>, <NUM> and the third side <NUM> (e.g., bottom surface) may protrude from the first slot <NUM> of the threaded retaining spindle <NUM> along the z-axis). The side surface <NUM> and side surface <NUM> may be contoured as opposing faces. Further, the fourth side <NUM> (e.g., top surface) and the third side <NUM> (e.g., bottom surface) may be contoured as opposing faces (e.g., planar faces).

The unthreaded collet <NUM> may include a shank <NUM> fixedly attached to the enlarged head <NUM>, with a continuous interior cavity running through both components. The interior cavity may be parallel and aligned to a central axis (e.g., parallel to the y-axis) of the unthreaded collet <NUM>. An end of the shank <NUM> opposite the enlarged head <NUM> may include a plurality of flexible legs <NUM> connected to a plurality of clamping feet <NUM>. The plurality of flexible legs <NUM> may include a first leg <NUM>, a second leg <NUM>, and so on around the outer diameter of the shank <NUM>. The legs may extend axially from the shank <NUM>, with a slot formed between each adjacent leg of the plurality of flexible legs <NUM>. Each leg of the plurality of flexible legs <NUM> may include a clamping foot, thereby forming the plurality of clamping feet <NUM>. For example, the first leg <NUM> may include a first clamping foot <NUM>, the second leg <NUM> may include a second clamping foot, and so on.

When the unthreaded collet <NUM> is axially translated is a first direction, the plurality of clamping feet <NUM> may be radially retracted. The radially retracted clamping feet diameter may be designed to retract to a diameter at or below the shank diameter of the collet <NUM>. Specifically, in one example, the diameter of the central slot <NUM> may be smaller than the diameter of the interior cavity of the unthreaded collet <NUM>. However, other relative sizes of these diameters may be used, in other examples. As the plurality of flexible legs <NUM> are attached the plurality of clamping feet <NUM>, the plurality of flexible legs <NUM> may angle inward (e.g., relative to the shank <NUM>) towards the central slot <NUM> in a closed position when the plurality of clamping feet <NUM> are radially retracted (e.g., the slots formed between adjacent legs may taper towards the central slot <NUM>), allowing the unthreaded collet to be inserted into workpiece openings. When the unthreaded collet <NUM> is axially translated is a second direction. In one example, as the plurality of clamping feet <NUM> are spread apart, the ends of the plurality of flexible legs <NUM> attached to the plurality of clamping feet <NUM> may also be spread apart so that the legs may be substantially axially aligned with the shank <NUM> and be in an open position (e.g., the legs and the shank <NUM> may form a straight line along the y-axis).

The enlarged head <NUM> and a portion of the shank <NUM> adjacent to the enlarged head <NUM> may be laterally inserted into the second slot <NUM> of the threaded retaining spindle <NUM> so that the interior cavity of the unthreaded collet <NUM> may be aligned with a central axis (e.g., parallel to the y-axis) and the opening of the threaded retaining spindle <NUM> as well as the second aperture <NUM> of the block <NUM>. After insertion, the shank <NUM> of the unthreaded collet <NUM> may extend away from the first face <NUM> along the y-axis, with a portion of the shank <NUM> outside of the threaded retaining spindle <NUM>.

Further in one example, the interior cavity of the unthreaded collet <NUM>, the opening of the threaded retaining spindle <NUM>, and the second aperture <NUM> of the block <NUM> may be concentric and in some cases may have similar dimensions, where the dimensions may accommodate insertion of the interior spindle <NUM>. Insertion of the interior spindle <NUM> may occur in the second assembly stage <NUM> of assembly after the first assembly stage <NUM> has been completed (e.g., the block <NUM> and the unthreaded collet <NUM> have been laterally inserted into the threaded retaining spindle <NUM>). In the second assembly stage <NUM>, the plurality of clamping feet <NUM> of the unthreaded collet <NUM> may be adjusted to an open position. In the open position, a first end <NUM> of the interior spindle <NUM> may be inserted through the central slot <NUM> and into the shank <NUM>, along the central axis of the threaded retaining spindle <NUM>. The length of the interior spindle <NUM> may be inserted through the central slot <NUM> so that a second end <NUM> the interior spindle <NUM> is within the unthreaded collet <NUM>. During insertion, the interior spindle <NUM> may pass through one or more openings in the proximal end of the threaded retaining spindle <NUM> and into or through the second aperture <NUM> of the block <NUM> and may extend into opening <NUM> of the threaded retaining spindle <NUM> (see at least <FIG>) as shown in the third assembly stage <NUM>. Specifically, the threaded retaining spindle may include two center holes (or openings) along the long axis of the spindle. One hole may be between the collet slot and the block slot and the other hole may extend at least partially from the block slot towards the proximal end. The first hole allows the interior spindle <NUM> to extend from the unthreaded collet into the block where it may be fixedly attached. The second hole may be optionally included in the fastener and may be helpful from an engineering standpoint as it can provide stability and may help the parts maintain a smooth action along the centerline. The third assembly stage <NUM> shows the threaded retaining spindle <NUM>, the unthreaded collet <NUM>, the block <NUM>, and the interior spindle <NUM> in an assembly <NUM> (e.g., after the first assembly stage <NUM> and the second assembly stage <NUM> have been completed).

Once the assembly <NUM> has been formed using the previously mentioned assembly steps, the interior spindle <NUM> may be axially (e.g., parallel to the y-axis) linked (e.g., fixedly coupled) to the block <NUM> as shown in <FIG> are side perspective views of the assembly <NUM> with the interior of the assembly <NUM> shown in phantom. By linking or fixedly attaching the interior spindle <NUM> to the block <NUM>, the interior spindle <NUM> and the block <NUM> may move in unison within the first slot <NUM> (e.g., along the y-axis, parallel to the central axis of the interior spindle <NUM>) of the interior spindle <NUM>. In some embodiments, the interior spindle <NUM> may be axially linked to the block <NUM> by deforming a portion of the interior spindle <NUM> housed within the block <NUM> in the assembly <NUM>. The interior spindle <NUM> may be located within the shank <NUM> of the unthreaded collet <NUM>, the second aperture <NUM> of the block <NUM>, and the opening (see at least <FIG>) of the threaded retaining spindle <NUM> after being inserted through the central slot <NUM> of the unthreaded collet <NUM> as described with respect to <FIG>. The portion of the interior spindle <NUM> residing within the second aperture <NUM> of the block <NUM> (e.g., in between the third side <NUM> and the fourth side <NUM>) may be deformed by inserting a deforming tool (e.g., a punch tool or other suitable tool) into the first aperture <NUM> of the block <NUM>. The deforming tool may be inserted into the first aperture <NUM> through the first side <NUM> or the second side <NUM>. After deformation, the portion of the interior spindle <NUM> residing within the second aperture <NUM> of the block <NUM> may no longer be straight (e.g., parallel with the y-axis) as shown in <FIG>. A deformed portion <NUM> of the interior spindle <NUM> residing within the second aperture <NUM> may have a kink or indentation that locks the interior spindle <NUM> to the block <NUM>. The deformed portion <NUM> may prevent the interior spindle <NUM> from sliding axially within the second aperture <NUM> of the block <NUM> and with respect to the block <NUM>. Thus, after the block <NUM> and the interior spindle <NUM> may axially translate as a unit. In some embodiments, the interior spindle <NUM> may be linked (e.g., fixedly attached) within the second aperture <NUM> of the block <NUM> by another suitable technique (e.g., welding, mechanical attachment (e.g., bolting or clamping), combinations thereof, and the like).

<FIG>, <FIG> show different views of the assembly <NUM> including the deformed portion <NUM> that may axially link the interior spindle <NUM> to the block <NUM>. <FIG> shows a side view of the assembly <NUM> along the y-axis. An axis A1 may define the central axis of the assembly <NUM> which may be aligned to a central axis of the threaded retaining spindle <NUM>. <FIG> is a cross-sectional view of the view of <FIG> defined by a cut plane extending through the center of the assembly <NUM> (e.g., across axis A1). The cross-sectional views illustrated in <FIG> may defined by similar cut planes.

Continuing with <FIG>, <FIG>, as previously described, the interior spindle <NUM> may be inserted within the assembly <NUM> so that the first end <NUM> may be located within an opening <NUM> of the threaded retaining spindle <NUM> and the second end <NUM> may be located within the unthreaded collet <NUM>. After being linked to the block <NUM>, the interior spindle <NUM> may axially translate within the threaded retaining spindle <NUM> (e.g., move back and forth through the first slot <NUM>, the second slot <NUM>, and the opening <NUM> along the y-axis) as well as into and out of the unthreaded collet <NUM> (e.g., via the central slot <NUM>) as the block <NUM> axially translates within the first slot <NUM>. <FIG> is a <NUM> degree rotated view of the view of <FIG> along the axis A1. As previously described, after lateral insertion of the block <NUM> into the threaded retaining spindle <NUM>, the beveled sides of the block <NUM> as well as a portion of the side surface <NUM> and the side surface <NUM> may protrude from the first slot <NUM> along the z-axis. The protruding parts of the block <NUM> may prevent the assembly <NUM> from rotating within the center section <NUM> of the fastener <NUM> as further described with respect to <FIG>.

<FIG> is a cross-sectional view of the view of <FIG> taken at the center of the assembly <NUM> (e.g., across axis A1). As previously described, the deformed portion <NUM> that may axially link the interior spindle <NUM> to the block <NUM> may reside between the third side <NUM> and the fourth side <NUM> of the block <NUM>. The block <NUM> may axially translate back and forth within the first slot <NUM>. For example, the block <NUM> may slide back so that the third side <NUM> may be adjacent to a proximal side <NUM> of the first slot <NUM>. When the third side <NUM> is adjacent to the proximal side <NUM>, the first end <NUM> of the interior spindle <NUM> may be within the opening <NUM> of the threaded retaining spindle <NUM> and the second end <NUM> may be housed within the unthreaded collet <NUM>. In another example, the block <NUM> may slide forward where the fourth side <NUM> may be adjacent to a distal side <NUM> of the first slot <NUM>. When the fourth side <NUM> is adjacent to the distal side <NUM>, the first end <NUM> of the interior spindle <NUM> may still remain within the opening <NUM> but the first end <NUM> may be closer in proximity to the first slot <NUM> than when the block <NUM> is in contact with the proximal side <NUM>. Further, when the fourth side <NUM> of the block <NUM> is adjacent to the distal side <NUM>, the second end <NUM> of the interior spindle <NUM> may be outside the unthreaded collet <NUM> (e.g., the second end <NUM> may protrude from the unthreaded collet <NUM> through the central slot <NUM>). The block <NUM> may axially translate within the first slot <NUM> between the proximal side <NUM> and the distal side <NUM>, with the position and movement of the interior spindle <NUM> linked to that of the block <NUM>. Once the interior spindle <NUM> has been axially linked to the block <NUM>, the assembly <NUM> may be inserted into the body of the fastener <NUM> as further described with respect to <FIG>.

<FIG> shows a side perspective view of the assembly <NUM> partially inserted into the center section <NUM> of the fastener <NUM>. As previously mentioned the center section <NUM> may include the interior cavity <NUM>. An inner surface <NUM> of the center section <NUM> that may define the interior cavity <NUM> may be shaped with anti-rotation features that may prevent rotation of the assembly <NUM> and the second end cap <NUM> after insertion into the center section <NUM>. In some embodiments, the inner surface <NUM> may be hexagonally shaped where the corners of the inner surface <NUM> may be complementary to the beveled sides of the block <NUM>. However, other polygonal shapes of the inner surface have been envisioned. The interior cavity <NUM> may be of suitable dimensions to accommodate insertion of the assembly <NUM> through the second end <NUM> (e.g., along the y-axis) of the center section <NUM>. During and/or after insertion, the beveled sides (e.g., first side <NUM> and second side <NUM>) of the block <NUM> may be mated with the inner surface <NUM>.

<FIG> shows a cross-sectional view of a portion of the assembly <NUM> shown in <FIG>, as defined by a lateral cut taken along dashed line 5B-5B, illustrated in <FIG>. Specifically, as shown in <FIG>, the first side <NUM> and the second side <NUM> of the block <NUM> may be adjacent to two opposing corners of the hexagonally-shaped inner surface <NUM> of the center section <NUM> after and/or during insertion of the assembly <NUM> into the center section <NUM>. As previously described, the side surface <NUM> and the third side <NUM> (e.g., bottom surface) of the block <NUM> may be adjacent to the inner surfaces of the first slot <NUM> of the threaded retaining spindle <NUM> after lateral (e.g., parallel to the z-axis) insertion. Thus, the external profile of the block <NUM> interacts with the first slot <NUM> to provide anti-rotation functionality while allowing for axial translation between the block <NUM> and the threaded retaining spindle <NUM>. The block <NUM> may first be confined to axial translation without rotation within the first slot <NUM> and secondly confined to axial translation without rotation within the body of the fastener <NUM>. In doing so, the cooperation of the block <NUM>, body (e.g., an assembly of the center section <NUM>, the first end cap <NUM>, and the second end cap <NUM>), and threaded retaining spindle <NUM> may create a double axial translation without the possibility of rotation, as further described below.

Turning now to <FIG>, a cross-sectional side view of the fully assembled fastener <NUM> is illustrated. As previously described, a body <NUM> of the fastener <NUM> may include the center section <NUM>, the first end cap <NUM>, and the second end cap <NUM>. The body <NUM> may surround and maintain the position of the inner components of the fastener <NUM>. An outer surface of the tubed portion <NUM> of the second end cap <NUM> may be complementary in shape and dimensions to the inner surface <NUM> of the center section <NUM>. After insertion of the second end cap <NUM> into the second section <NUM> at the second end <NUM> of the center section <NUM>, the outer surface of the tubed portion <NUM> may be in face-sharing contact with the inner surface <NUM> and the outer edges of the top <NUM> of the second end cap <NUM> may be in flush, face-sharing contact with the second end <NUM>. The top <NUM> may include an aperture <NUM> which may accommodate the diameter of the shank <NUM> of the unthreaded collet <NUM>. The shank <NUM> may extend away from the body <NUM> of the fastener <NUM> parallel to the y-axis and aligned to the central axis of the fastener <NUM>. The unthreaded collet <NUM> may be radially constrained by the threaded retaining spindle <NUM> at the boundary of the enlarged head <NUM> within the second slot <NUM>.

The free-spin spring <NUM> may be positioned around the shank <NUM> adjacent to the enlarged head <NUM> within the second slot <NUM>. The free-spin spring <NUM> may be adjacent to the first face <NUM> of the threaded retaining spindle <NUM> (e.g., located on the non-threaded portion <NUM>) and a bottom surface <NUM> of the top <NUM> of the second end cap <NUM>. The block <NUM> may be located within the first slot <NUM> of the threaded retaining spindle <NUM> and engage with the inner surface <NUM> of the center section <NUM> of the body <NUM> of the fastener <NUM>, as previously described. The block <NUM> may be axially linked to the interior spindle <NUM> and engage with the inner surface <NUM> of the center section <NUM> of the body <NUM>. The interior spindle <NUM> may be aligned to the central axis of the fastener <NUM> and positioned within the unthreaded collet <NUM>. The spreader spring <NUM> may surround the threaded portion <NUM> of the threaded retaining spindle <NUM> within the interior cavity <NUM> of the center section <NUM>. Further, a distal end of the spreader spring <NUM> may, in certain configurations, push against portions of the fourth side <NUM> of the block <NUM> that protrude from the first slot <NUM> of the threaded retaining spindle <NUM>. Further, the proximal end of the spreader spring <NUM> may cooperate with the drive nut <NUM>.

The first section <NUM> of the center section <NUM> may be inserted into the first end cap <NUM> so that the first face <NUM> of the first end cap <NUM> is flush with the second section <NUM>. Thus, the proximal end cap may be press fit into the center section, in one example, although other suitable attachment techniques (e.g., welding, mechanical attachment, etc.) between the components may be additionally or alternatively used in other examples. A second face <NUM> (e.g., opposite the first face <NUM>) of the first end cap <NUM> may include an aperture <NUM>. The aperture <NUM> may be shaped to accommodate the shaft <NUM> of the drive nut <NUM>, where the shaft <NUM> may be rotated by an external force. For example, a user may rotate the shaft <NUM> using a tool <NUM> (e.g., a hex tool, a socket tool, a screw bit tool, etc.). In one example, the tool <NUM> may include memory <NUM> and a processor <NUM>. In such an example, the tool may be configured to implement automated or partially automated tooling processes. However, in other examples, the tool <NUM> may be configured for manual operation. The drive nut <NUM> may be positioned within the fastener <NUM> where the section <NUM> of the drive nut <NUM> may be housed within the first end cap <NUM>. The shaft <NUM> of the drive nut <NUM> may extend through the aperture <NUM>, away (e.g., along the y-axis) from and out of the body <NUM> of the fastener <NUM> (e.g., the shaft <NUM> may be located outside of the fastener <NUM> and be perpendicular to the second face <NUM>).

The first washer <NUM> may be positioned around the shaft <NUM> and located between the first surface <NUM> of the section <NUM> and a back surface <NUM> of the first end cap <NUM>. The second washer <NUM> may be adjacent to the second face <NUM> on the section <NUM> and the first end <NUM> of the center section <NUM>. An inner interior portion <NUM> of the drive nut <NUM> may include a first inner non-threaded region <NUM>, a second inner non-threaded region <NUM>, and an inner threaded region <NUM> located in between the two inner non-threaded regions.

The first inner non-threaded region <NUM> may span a portion of and be located at the end of the shaft <NUM>. The inner non-threaded region <NUM> may be shaped to receive a driver of the tool that may be used to rotate the drive nut <NUM>. Additionally, the drive nut <NUM> may be configured to receive tooling such as a wrench or socket. Further, the outside of the main body <NUM> and/or the outside of the end cap <NUM> may also be configured to receive tooling such as a wrench. The inner threaded region <NUM> may extend down the length of the shaft <NUM> and terminate within the section <NUM> of the drive nut <NUM>. The second inner non-threaded region <NUM> of the drive nut <NUM> may span the remaining interior portion <NUM> within the section <NUM>. However, other arrangements of the drive nut sections have been envisioned. The tool <NUM> may be inserted, manually or via automation, into an end <NUM> of the drive nut <NUM>, where the tool <NUM> mates with the first inner non-threaded region <NUM> so that torque may be transferred from the tool <NUM> to the drive nut <NUM>.

The length of the interior portion <NUM> of the drive nut <NUM> accommodates the length of the threaded portion <NUM> of the threaded retaining spindle <NUM>, in one example. In other examples, the threaded retaining spindle may be sized so that it protrudes past the end of <NUM> when in use. Specifically, the inner threaded region <NUM> of the drive nut <NUM> may engage part of the threaded portion <NUM> of the threaded retaining spindle <NUM>. Thus, the drive nut <NUM> may be threadingly engaged with the threaded retaining spindle <NUM>. Additionally, in one example, the threaded portion <NUM> may pass through the second washer <NUM> and into the inner threaded region <NUM> through the second face <NUM> of the section <NUM>. The washers may aid in the promotion of a smooth feel while using the fastener. However, in other examples, the washers may be omitted from the fastener.

As previously discussed, the block <NUM> may be fixedly coupled to the interior spindle <NUM> and mated within the threaded retaining spindle <NUM> which may be coupled to the unthreaded collet <NUM>. Additionally, the body <NUM> of the fastener <NUM> may circumferentially surround the block <NUM> and the threaded retaining spindle <NUM>. In this configuration, the block <NUM>, the body <NUM>, and the threaded retaining spindle <NUM> are designed to axially translate with regard to one another but are substantially prevented from rotation with regard to one another, during different clamping stages. To elaborate, in one example, rotation of the drive nut <NUM> in a first direction <NUM> (e.g., clamping direction) causes axial translation of the threaded retaining spindle <NUM> upward (indicated via arrow <NUM>) while the block <NUM> remains substantially stationary as the urging of the spreader spring pushes the block down against <NUM> even though the threaded retaining spindle (<NUM>) axially travels towards the proximal end. and rotation between the components is substantially inhibited. As the threaded retaining spindle <NUM> and coupled unthreaded collet <NUM> move upward into the body <NUM>, and while the temporarily stationary block and fixedly attached to <NUM>, the first end <NUM> (e.g., the distal end) of the interior spindle <NUM> interacts with the plurality of flexible legs of the unthreaded collet <NUM> to push the legs radially outward into a clamping configuration. The fastener is capable of achieving this functionality because the spreader spring may be powerful enough to hold the block and corresponding spindles (e.g., spindle <NUM>) in place while the threaded retaining spindle and linked collet axially travel to the point that the fingers open on the collet. In other words, the spreader spring may overcome the axial force demanded to pull the closed fingers of the collet over the spindle <NUM> and open the fingers. Once the fingers are open, the slot in spindle <NUM> may be sized so that the block hits the end of the slot in spindle <NUM>. At this point, the spring is incapable of overcoming the threaded action of the spindle <NUM> and the drive nut and compresses while the threaded retaining spindle and attached collet and joined block/spindle (where the block now resides at bottom of slot in the spindle <NUM>) all travel axially toward the proximal end as the threading action continues.

After this initial phase, additional rotation of the drive nut <NUM> in the clamping direction causes both the interior spindle <NUM> and the unthreaded collet <NUM> to axially translate upward into the body <NUM> while rotation between the body <NUM> and the block <NUM> is again, substantially inhibited. This functionality may be achieved because the spreader spring <NUM> may be powerful enough to hold the block and corresponding spindles in place while the threaded retaining spindle <NUM> and linked collet axially travel to the point that the fingers open on the collet. Thus, the spreader spring overcomes the axial force demanded to pull the closed fingers of the collet over the spindle <NUM> and open the fingers. Once the fingers are open, the slot in spindle <NUM> may be sized so that the block hits the end of the slot in the spindle <NUM>. At this point, the spring <NUM> may have no chance to overcome the threaded action of the threaded retaining spindle and the drive nut and simply compresses while the threaded retaining spindle and attached collet and joined block all travel axially toward the proximal end as the threading action continues. The axial translation of the interior spindle and the unthreaded collet continues until the block (previously held axially stationary at the urging of the spreader spring even though <NUM> was axially translating toward the proximal end) reaches the distal end of the slot in <NUM> and now axially translates toward the proximal end along with spindle <NUM>. As such, once the block has reached the end of the slot in <NUM> and begins axially translating with spindle <NUM>, the spreader spring begins to compress. Additionally, since the block is axially traveling with the spindle <NUM> then the spindle <NUM>, which is fixedly attached to the block, also axially translates with the block. In this way, once the fastener <NUM> has placed the collet's feet into a clamped configuration, the <NUM>, block, <NUM> (attached to the block), and collet are all axially drawn into the body <NUM> enabling the fastener's overall length to be decreased as the grip length decreases. The fastener <NUM> can therefore achieve greater compactness during clamping. The different sequences of clamping and unclamping action in the fastener <NUM> are elaborated upon below.

<FIG> show different configurations of the assembled fastener <NUM> prior to and/or during use and will be described collectively, with the described components and features labeled within the figures. <FIG> and <FIG> depict the fastener <NUM> in a "ready to install" configuration, with <FIG> showing a cross-sectional top view of this position and <FIG> showing a cross-sectional side view. In the "ready to install" position, the unthreaded collet <NUM> may be urged to axially translate in tandem with the threaded retaining spindle <NUM> via the cooperation of the enlarged head <NUM> within the second slot <NUM> of the threaded retaining spindle <NUM>, with the second slot <NUM> primarily securing the unthreaded collet <NUM> in an axial direction. The cooperation of the enlarged head <NUM> within the second slot <NUM> may carry/transfer the axial load and also position the unthreaded collet <NUM> axially at a desired location. The unthreaded collet <NUM> may be partially radially constrained to the threaded retaining spindle <NUM> at the boundary of the enlarged head <NUM> and diameter of the shank <NUM> within the second slot <NUM>. Further, the interior spindle <NUM> may simultaneously reside within the threaded retaining spindle <NUM>, the block <NUM>, and the unthreaded collet <NUM>, with the interior spindle <NUM> fixedly attached to the block <NUM>. Thus, the unthreaded collet <NUM> may be radially constrained directions (e.g., in all directions) perpendicular to the long axis (e.g., parallel to the y-axis) of the fastener <NUM> via cooperation of these parts.

The fixed attachment of the interior spindle <NUM> to the block <NUM> may radially locate the block <NUM> to the central axis of the threaded retaining spindle <NUM> and within the first slot <NUM>. Thus, the block <NUM> may be radially located within the threaded retaining spindle <NUM> and may axially translate within the first slot <NUM> while remaining centered (e.g., the block <NUM> may axially translate within the first slot <NUM> without rotation). Thus, the interior spindle <NUM> and the block <NUM> may axially translate as a unit, while the interior spindle <NUM> retains the ability to axially translate within the other aforementioned components (e.g., the interior spindle <NUM> may still axially translate within the unthreaded collet <NUM> and into the opening <NUM> of the threaded retaining spindle <NUM> with the block <NUM> in tow). In some embodiments, a lip <NUM> may be introduced toward the distal end of the body <NUM> that may substantially prevent the block <NUM> and the interior spindle <NUM> from axially translating beyond the lip <NUM>. For example, the lip <NUM> may be created by the boundary formed between a mechanically bound end of the tubed portion <NUM> of the second end cap <NUM> to the center section <NUM> of the body <NUM>. The spreader spring <NUM> may push against the fourth side <NUM> of the block <NUM> so that the block <NUM> and the interior spindle <NUM> may be held against the lip <NUM>.

The drive nut <NUM> may be rotated in a loosening direction where a proximal end <NUM> of the threaded retaining spindle <NUM> may be expelled from the inner threaded region <NUM> of the drive nut <NUM> which, in turn, may cause the free-spin spring <NUM> to be compressed. Compression of the free-spin spring <NUM> may result in a return spring force that persistently urges the proximal end <NUM> to remain in contact with the threads of the inner threaded region <NUM> of the drive nut <NUM>. Further, the interior spindle <NUM> may be positioned within the unthreaded collet <NUM> such that the plurality of flexible legs <NUM> are in a closed position (as previously described with respect to <FIG>). Once the fastener <NUM> is in the "ready to install" position, it may transition to a "ready to clamp" configuration as shown in <FIG> and <FIG>. <FIG> is a cross-sectional view of the "ready to clamp" configuration and <FIG> is a cross-sectional side view of the "ready to clamp" configuration.

To transition to the "ready to clamp" configuration, rotation of the drive nut <NUM> may be changed to a tightening direction (e.g., opposite the loosening direction). As the drive nut <NUM> rotates, threads within the inner threaded region <NUM> may re-engage with the threaded portion <NUM> of the threaded retaining spindle <NUM>, with the compressed free-spin spring <NUM> urging the end <NUM> of the threaded retaining spindle <NUM> into the section <NUM> of the drive nut <NUM>. Thus, as rotation continues, the threaded portion <NUM> may be drawn into the drive nut <NUM> without rotating the threaded retaining spindle <NUM>. Further, as the threaded retaining spindle <NUM> is drawn into the drive nut <NUM>, the first slot <NUM> and the unthreaded collet <NUM> may be simultaneously drawn toward the end <NUM> of the fastener <NUM>, without the unthreaded collet <NUM> undergoing rotation. The axial motion of the threaded retaining spindle <NUM> toward the end <NUM> of the fastener <NUM> may occur as the spreader spring <NUM> pushes against the fourth side <NUM> of the block <NUM>. The spring force exerted by the spreader spring <NUM> may hold the block <NUM> and interior spindle <NUM> at a stationary position against the lip <NUM> as the threaded retaining spindle <NUM> is drawn into the drive nut <NUM>. The spreader spring <NUM> may be continually compressed between the drive nut <NUM> and the block <NUM> as the threaded retaining spindle <NUM> is drawn into the drive nut <NUM>. Concurrently, compression of the free-spin spring <NUM> may decrease (e.g., the free-spin spring <NUM> may expand) as the drive nut is tightened. The relative motion of the threaded retaining spindle <NUM> past the block <NUM> may be facilitated via the sizing and position of the first slot <NUM> and the cooperation of the first slot <NUM> with respect to the block <NUM>. As the threaded retaining spindle <NUM> and unthreaded collet <NUM> axially translate with drive nut <NUM> tightening, the block <NUM> (being held against the lip <NUM>) may come into closer proximity with a distal end <NUM> of the first slot <NUM>, as the side surfaces of the block <NUM> cooperate with the adjacent inner surfaces of the first slot <NUM>. For example, the inner surfaces of the first slot <NUM> may include grooves or threads complimentary to grooves or threads located on the side surfaces of the block <NUM> thereby facilitating cooperation of the block <NUM> within the first slot <NUM>.

The relative motion of the threaded retaining spindle <NUM> and the unthreaded collet <NUM>, with respect to the temporarily fixed block <NUM> and interior spindle <NUM>, may result in a distal end <NUM> of the unthreaded collet <NUM> being drawn closer and closer to the second end <NUM> of the interior spindle <NUM>. As the two ends are drawn into closer proximity, the interior spindle <NUM> may cause the plurality of flexible legs <NUM> to shift from a closed position to an open position. Thus, after insertion and activation of the fastener <NUM>, the interior spindle <NUM> may serve to keep the plurality of flexible legs <NUM> open during clamping as the clamping force itself may urge the plurality of flexible legs <NUM> to close should the distal end of the interior spindle <NUM> not be positioned within the plurality of flexible legs <NUM>. Further, as the second end <NUM> of the interior spindle <NUM> is drawn toward the distal end <NUM> of the unthreaded collet <NUM>, the first end <NUM> of the interior spindle <NUM> may be drawn away from the opening <NUM> (e.g., the interior spindle <NUM> may occupy the opening <NUM> to a lesser degree than when the fastener <NUM> is in a "ready to clamp" configuration as shown in <FIG> and <FIG>).

Further rotation of the drive nut <NUM> in the tightening direction may bring the fastener <NUM> into a "clamped" configuration as depicted in <FIG> and <FIG>. <FIG> is a cross-sectional view of the "clamped" configuration and <FIG> is a cross-sectional side view of the "clamped" configuration. As the drive nut <NUM> is tightened, the threaded retaining spindle <NUM> and the unthreaded collet <NUM> may be drawn further toward the proximal end <NUM> of the fastener <NUM> as it transitions to the "clamped" configuration. As the unthreaded collet <NUM> is drawn toward the proximal end <NUM> of the fastener <NUM>, the distal end <NUM> of the unthreaded collet <NUM> may come into closer proximity to the second end cap <NUM> of the body <NUM> as well as the second end <NUM> of the interior spindle <NUM> as the block <NUM> and the interior spindle <NUM> are held in position (e.g., via the spring force of the spreader spring <NUM> and the lip <NUM>). These combined actions may continue as the drive nut <NUM> is tightened until the second end <NUM> of the interior spindle <NUM> protrudes past the distal end <NUM> of the unthreaded collet <NUM> and, in doing so, may mechanically assure that the plurality of flexible legs <NUM> are in an open expanded (e.g., fully expanded) position, in one embodiment.

Further, the first slot <NUM> may be sized and positioned so that when the plurality of flexible legs <NUM> are held in an open position via the interior spindle <NUM> via the aforementioned sequence of events, the distal end <NUM> of the first slot <NUM> may begin to cooperate with (e.g., solid contact may occur between) the third side <NUM> of the block <NUM>. Further tightening of the drive nut <NUM> may continue to draw the threaded retaining spindle <NUM> via threading action toward the proximal end <NUM> of the fastener <NUM> as well as the now mechanically bound first slot <NUM>. As such, the block <NUM> may be forcibly drawn toward the proximal end <NUM> of the fastener <NUM> (e.g., the block <NUM> may axially translate without rotation) via the threading action between the drive nut <NUM> and threaded portion <NUM> of the threaded retaining spindle <NUM>. The threading action may overcome the resistance of the partially compressed spreader spring <NUM> and further compress the spreader spring <NUM>. As such, the threaded retaining spindle <NUM>, unthreaded collet <NUM>, block <NUM>, and interior spindle <NUM> may act as a single unit via their respective cooperating features as they are drawn toward the proximal end <NUM> of the fastener <NUM> via tightening of the drive nut <NUM>.

As tightening continues, the unthreaded collet <NUM> (with the plurality of flexible legs <NUM> in an open/expanded (e.g., fully expanded) position), the threaded retaining spindle <NUM>, block <NUM>, and interior spindle <NUM> may axially travel in tandem toward the proximal end <NUM> of the fastener <NUM>, so that the fastener <NUM> may impart a threadably driven clamping action to the objects to be clamped via the tightening torque applied to the drive nut <NUM>. In this way, rotation of the drive nut in one direction induces axial translation of the threaded retaining spindle in relation to the block and radial expansion of the clamping feet outward.

Further, after the fastener <NUM> is in the "clamped" configuration, the fastener <NUM> may be returned to the "ready to install" configuration by rotating the drive nut <NUM> in the loosening direction which may reverse the sequence of events described above. Thus, the fastener <NUM> may be used as a temporary fastener. Additionally, it will be appreciated, that in the configuration described herein, the fastener <NUM> may apply clamping forces to workpieces with a wide variety of thicknesses.

By transitioning between the different configurations described with respect to <FIG>, the fastener <NUM> may be used to fasten at least two objects together as shown in <FIG> is a side view of the fastener <NUM> in a "ready to install" configuration (e.g., as previously described with respect to <FIG> and <FIG>). The collet <NUM> of the fastener <NUM> may be inserted through a front face <NUM> into a blind hole <NUM> traversing a first object <NUM>. The blind hole <NUM> may be complementary in shape (e.g., circular) and dimensions to accommodate the outer diameter of the collet <NUM>, in some instances. Further, in some examples, the blind hole <NUM> may be a drilled hole that traverses the first object <NUM> so that, after insertion, a tip <NUM> of the collet <NUM> may exit a back face <NUM> of the first object <NUM>. The tip <NUM> may include the plurality of flexible legs <NUM> attached to the plurality of clamping feet <NUM> as previously described (see <FIG>). After passing through the first object <NUM>, the tip <NUM> of the collet <NUM> may be further inserted through a front face <NUM> of a second object <NUM> into a through-hole <NUM>.

The blind hole <NUM> and the through-hole <NUM> may be aligned to one another as well as the central axis, as may be defined by axis A1, of the fastener <NUM> after the collet <NUM> has been inserted into both objects. After collet <NUM> insertion, the drive nut <NUM> of the fastener <NUM> may be rotated in a tightening direction thereby transitioning the fastener <NUM> from the "ready to install" configuration to the "ready to clamp" configuration as previously described with respect to <FIG> and <FIG>. As the drive nut <NUM> is tightened, the tip <NUM> of the collet <NUM> may expand within the second object <NUM> as the second end <NUM> of the interior spindle <NUM> is drawn to and through the tip <NUM>. As the interior spindle <NUM> is drawn toward the tip <NUM>, the second end <NUM> may force the plurality of flexible legs <NUM> from the closed position to the open position. As the plurality of flexible legs <NUM> transition from closed to open (e.g., the plurality of clamping feet <NUM> are forced radially outward), the tip <NUM> may become secured within and to the through-hole <NUM> as shown in <FIG>. In some examples, the interior spindle <NUM> may be configured such that the plurality of flexible legs <NUM> may be closed upon insertion of the fastener <NUM> into a hole at the impetus of the hole itself. As such, after fastener insertion and transition to the "ready to clamp" configuration, the interior spindle <NUM> would serve to keep the legs open during clamping as the clamping force itself would urge the legs to close should there be no the interior spindle <NUM>.

<FIG> is a side view of the fastener <NUM> in a "clamped" configuration as described with respect to <FIG> and <FIG>. After the tip <NUM> is secured to the through-hole <NUM> of the second object <NUM>, continual tightening of the drive nut <NUM> will draw the first object <NUM> and the second object <NUM> into closer and closer proximity to the distal end of the fastener <NUM> as the threaded retaining spindle <NUM> to which the collet <NUM> is coupled is drawn into the drive nut <NUM>. The drive nut <NUM> may be tightened until applied torque no longer rotates the drive nut <NUM> and the first object <NUM> is fastened (e.g., securely joined) to the second object <NUM>.

<FIG> shows a method <NUM> for operating a fastener. The method may be implemented by any of the fasteners or combinations of the fasteners described above with regard to <FIG>. However, in other examples, the method may be implemented by other suitable fasteners. It will be appreciated that the method <NUM> may be at least implemented in part via an automated process. As such, the method steps may be stored as instructions in non-transitory memory that when executed by the processor cause a controller to implement the method steps. It will be understood that the memory and processor may be included in hardware of a tooling apparatus. It will also be appreciated that the automated tooling apparatus may further include tooling attachments, arms, carriages, drivers, etc., for manipulating the fastener. However, at least some of the steps, in some examples, may be implemented via manufacturing personnel manually operating tooling apparatuses. The fastener may include a block fixedly coupled to an interior spindle and mated with a slot in a threaded retaining spindle, a drive nut engaged with the threaded retaining spindle, an unthreaded collet coupled to the threaded retaining spindle and including a plurality of flexible legs each including a clamping foot, and a body circumferentially surrounding the block and the threaded retaining spindle. The block, the body, and the threaded retaining spindle of the fastener are configured to axially translate with regard to one another and are substantially prevented from rotation with regard to one another.

At <NUM>, the fastener's collet is inserted into objects slated for clamping. Inserting the fastener's collet into the objects may include steps <NUM> and <NUM>. At <NUM>, the distal end of the collet is inserted through a hole in a first object and at <NUM> the distal end of the collet is inserted through a hole in a second object. It will be understood that in other embodiments, the collet may be inserted through additional workpieces slated for clamping. In one example, the collet's legs may be bent inward in an unclamped configuration during insertion through the workpieces. However, in another example, the plurality of flexible legs on the collet may be designed such that they remain in a clamped configuration even when the center spindle is not forcing their expansion. Therefore, in such an example, the collet legs may be bent inward into the unclamped configuration when they are inserted through the workpiece openings. As such, after fastener insertion, the interior spindle would serve to keep the legs open during clamping as the clamping force itself would urge the legs to close should there be no the interior spindle. It will be understood that the holes in the objects may be of suitable dimensions to accommodate the outer diameter of the shank of the collet.

At <NUM>, the fastener is transitioned into a clamped configuration. Transitioning the fastener into the clamped configuration may include steps <NUM> and <NUM>. These steps may be referred to as a first clamping stage and a second clamping stage. At <NUM>, the method includes rotating the drive nut in a clamping direction to place the collet legs in a clamped configuration. As the drive nut is rotated, the threaded retaining spindle becomes threadingly engaged with the drive nut thereby drawing the threaded retaining spindle, as well as the unthreaded collet, toward the proximal end and upward into the body of the fastener. In the first clamping stage, as the threaded retaining spindle and the unthreaded collet are drawn toward the proximal end of the body, the block and the interior spindle fixedly coupled to the block may be remain in a substantially fixed position with regard to the fastener body. In some embodiments, the block and the interior spindle may be held in position via a spring force exerted on the block (e.g., the spring force of the spreader spring <NUM> as described with respect to <FIG>) or a combination of spring force and lips within the body of the fastener (e.g., the block may be pressed against a lip via an exerted spring force thereby holding the block at a relative position within the fastener). These combined actions may continue as the drive nut is tightened until the distal end of the interior spindle protrudes past the distal end of the unthreaded collet and, in doing so, may mechanically assure that the plurality of flexible legs are in an open/expanded position. In this way, the plurality of flexible legs in the collet transition to a clamping configuration (e.g., pushed radially outward by the interior spindle).

At <NUM>, the method <NUM> further includes, rotating the drive nut in the clamping direction to induce axial translation of the threaded retaining spindle, collet, block, and interior spindle in unison into the fastener body. The drive nut may be continually rotated, thereby drawing the threaded retaining spindle and the unthreaded collet further toward the proximal end of the fastener as it transitions to a "clamped" configuration. As the threaded retaining spindle axially translates and is drawn into the drive nut via threading action, the block may come into closer and closer proximity with a distal end of the slot. The surfaces of the block mated with the slot may cooperate (e.g., the interacting surfaces of the block and the slot may have complimentary grooves or threads) so that the block (positioned within the body by an exerted spring force and a lip or lips) may remain in a stationary position relative to the movement of the threaded retaining spindle. Thus, the slot may axially delimit the block as the threaded retaining spindle axially translates so that the block may remain at a desired radial position but the position of the block is not set within the fastener. Once the drive nut has been rotated so that the block is adjacent to the distal end of the slot, further rotation may result further axially translation of the threaded retaining spindle and the unthreaded collet upward, where the grip length of the fastener is decreased. During this second stage, the clamping feet in the collet legs are brought closer to the workpieces. Drive nut rotation may be discontinued when a desired clamping force is exerted on the workpieces via the fastener.

At <NUM>, the fastener may be unclamped by rotating the drive nut in an unclamping direction (e.g., a direction opposite the clamping direction). Unclamping the fastener may include, at <NUM>, rotating the drive nut in an unclamping direction to induce axial translation of the threaded retaining spindle, collet, block, and interior spindle in unison away from the fastener body. As the drive nut is rotated, the sequence of events described with respect to step <NUM> may be reversed. The threaded retaining spindle and unthreaded collet may translate away from the body thereby increasing the fastener's grip length as the drive nut is rotated. Unclamping the fastener may further include, at <NUM>, rotating the drive in the unclamping direction to place the collet legs in an unclamped configuration. In this second unclamping stage, as the threaded retaining spindle is drawn out of the drive nut with rotation, the threaded retaining spindle and unthreaded collet axially translate away from the block. Thus, as the interior spindle is fixedly coupled to the block, the distal end of the unthreaded collet may move away from the distal end of the interior spindle so that the plurality of flexible legs may radially retract (e.g., the distal end of the interior spindle is no longer mechanically forcing the legs outward).

Unclamping the fastener may further include, at <NUM>, rotating the drive nut in the unclamping direction such that the drive nut freely spins in relation to the threaded retaining spindle. In this way, additional rotation in the unclamping direction threadingly decouples the threaded retaining spindle from the drive nut so that the drive nut may freely spin when torque is applied in the unclamping direction. However, when the fastener is in the free-spin configuration, the threaded retaining spindle may compress a free-spin spring within the fastener located adjacent to the distal end of the threaded retaining spindle. Compression of the free-spin spring may result in a spring force being exerted on the distal end of the threaded retaining spindle that urges the proximal end into the drive nut. Thus, when the drive nut is again rotated in a clamping direction, the threaded retaining spindle may re-engage with the drive nut. In this way, the fastener may be efficiently transitioned back to the clamping configuration. After step <NUM>, method <NUM> may end.

Claim 1:
A fastener (<NUM>) comprising:
a block (<NUM>) fixedly coupled to an interior spindle (<NUM>);
a threaded retaining spindle (<NUM>);
a drive nut (<NUM>) engaged with the threaded retaining spindle (<NUM>);
an unthreaded collet (<NUM>) coupled to the threaded retaining spindle (<NUM>) and including a plurality of flexible legs (<NUM>) each including a clamping foot (<NUM>); and
a body (<NUM>) circumferentially surrounding the block (<NUM>) and the threaded retaining spindle (<NUM>);
wherein the block (<NUM>), the body (<NUM>), and the threaded retaining spindle (<NUM>) are configured to axially translate in relation to one another; and
the body (<NUM>) and the threaded retaining spindle (<NUM>) are substantially prevented from rotation in relation to one another, during different stages of fastener operation;
characterized in that
the block (<NUM>) is mated with a slot (<NUM>) in the threaded retaining spindle (<NUM>); and
the block (<NUM>), the body (<NUM>), and the threaded retaining spindle (<NUM>) are substantially prevented from rotation in relation to one another, during different stages of fastener operation.