Patent Description:
The present disclosure relates to systems and methods for the assembly of industrial break-down spools.

The present disclosure relates generally to industrial break-down spools and methods of assembling and disassembling such spools. Industrial break-down spools often have two flanges and a barrel which connects the flanges. Industrial materials such as wire, cable, tubing, rope, yarn, or the like may be wound onto the barrel of the spool. The spools can be taken apart (i.e. the flanges removed from the barrel) during shipping or after use, for example, to conserve space and minimize shipping costs.

Typically, the flanges and barrel of an industrial spool twist and lock together with integral holding snaps on the flange that are very stiff in order to maintain the barrel/flange connection during winding and unwinding. To remove the flanges from the barrel, a user must lift the snaps that lock the spool parts together, often using a specialized tool to pry the snap away from the barrel because the force required to lift the snaps is greater than can be achieved manually with a finger. This is undesirable because users generally prefer to avoid purchasing, managing, and using special tools where possible. In addition, if the snap is damaged or destroyed during use, lifting with the tool, shipment, or the like, the entire flange must be discarded and replaced. The spool may be unusable in such condition. <CIT> describes a winding spool for wire end cable that has holding and locking fixtures forming a bayonet fixture between a removable flange and the spool core, which is held in the closed position by a locking mechanism in the form of a rocker in a recess within the flange.

A sliding lock has been developed for engaging and maintaining an industrial breakdown spool in a locked position. The sliding lock is easily engaged and disengaged without the use of any tool and can be stored within the flange construction when not in use. In addition, extra sliding locks can be stowed within the flange in case of failure, damage, or destruction of a sliding lock. In such case, the flange does not need to be discarded or replaced - merely the lock itself is replaced.

The invention is directed to a locking system for a spool, as described in independent claim <NUM>, comprising: a barrel comprising a first longitudinal end and a second longitudinal end, wherein at least the first longitudinal end comprises at least one barrel detent; a first flange removably affixable to the first longitudinal end of the barrel, wherein the first flange comprises at least one receiving location for a sliding lock, the receiving location comprising: at least one flange detent, wherein the at least one flange detent is aligned with the at least one barrel detent to form at least one track; and at least one sidewall having at least one recessed portion; and a sliding lock comprising: a body portion comprising a proximate end, a distal end, two sides, an outer surface and an inner surface; at least one rail disposed on the inner surface of the body portion, wherein the at least one rail is slidable in the at least one track; at least one flexible arm, wherein the at least one arm initiates near the proximate end of the body portion and extends adjacent to one of the sides of the body portion, toward the distal end of the body portion; at least one catch disposed on the at least one arm, wherein the catch is configured to slidably move into the at least one recessed portion of the flange receiving location and is restricted from moving out of the at least one recessed portion; a retaining portion extending from the distal end of the sliding lock, opposite the proximate end, wherein the retaining portion is configured to snap-fit onto a portion of a rib of the flange; and a lip extending from the proximate end of the sliding lock, opposite the distal end, wherein the lip is configured to engage with the flange within the receiving location.

In an embodiment, the sliding lock of the invention engages with an industrial spool flange and barrel. In the locked position, the sliding lock prevents the flange from rotating on the barrel and prevents disassembly of the spool. In an embodiment, the sliding lock has two rails that slide into detents in the flange and barrel, preventing flange rotation on the barrel. The sliding lock is removable and replaceable, without the need to replace the entire flange or barrel. The sliding lock is snap-fit into the flange and/or barrel in an embodiment, utilizing flexing arms and catches that lock it into place. The sliding lock can be engaged by sliding the lock radially inward (locked), with reference to the flange, and disengaged by squeezing the arms and sliding the lock radially outward (unlocked).

Depending on various factors, such as how heavy the wound media is, the industrial spool and sliding lock system may be configured for assembly in various ways, such as, for example, a flange comprising: (<NUM>) one sliding lock and no snaps (also referred to herein as locking tabs or flexible tabs); (<NUM>) one sliding lock in conjunction with a snap; or (<NUM>) two sliding locks and no snaps. If a snap is utilized, the snap may serve as a visual aid, making it easier to align the flange onto the barrel. Additionally, when the sliding lock is removed from the flange, there is a direct line of sight to the detents on the barrel, making it easier to align the flange to the barrel.

Other features of the present invention and combinations of features will become apparent from the detailed description to follow, taken in conjunction with the accompanying drawings.

For the purpose of illustrating the invention, the drawings show forms that are presently preferred. It should be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings.

The present invention relates to a breakdown spool of the type having a barrel and at least one flange formed separately from the barrel. The barrel is defined by a longitudinal axis, a substantially annular winding surface surrounding the longitudinal axis, and an insertion section formed on at least one axial end of the barrel. In one aspect of the present invention, the insertion section includes an annular ring spaced from the axial end of the barrel and projecting radially from the winding surface. The flange includes a support surface and a receiving channel formed within the support surface. The receiving channel is provided for receiving the insertion section of the barrel to form the completed spool. The receiving channel includes a first portion for receipt of the axial end of the barrel and a second portion for receiving the annular ring of the insertion section. The second portion of the channel is recessed within the support surface such that the annular ring mates with and aligns, preferably flush, with the support surface on the flange upon insertion of the axial end of the barrel into the receiving channel.

The barrel and/or flange(s) may comprise integrally molded thermoplastic material and the barrel may be substantially centrally hollow, the hollow portion defined by an inside wall of the winding surface. In a further aspect of the flange, the receiving channel within the flange may include an internal support wall, positioned to fit within the portion of the central hollow at the insertion section. The internal support wall may be formed at an inwardly directed acute angle with respect to the inside wall of the barrel when the insertion section of the barrel is secured within the receiving channel. The angle of the support wall preferably creates a space between a portion of the support wall and the inside wall of the barrel. In addition, a plurality of support tabs may be formed inwardly of the support wall for structurally stiffening the support wall.

In a further aspect of the spool, the receiving channel may include an outer wall formed at an acute angle with respect to the longitudinal axis of the barrel when the insertion section of the barrel is secured within the receiving channel. The barrel also includes an extension foot directed radially outward from the insertion section adjacent the axial end. The foot portion is located on the barrel axially outward of the annular ring. The foot preferably engages the outer wall of the receiving channel when the insertion end of the barrel is secured within the receiving channel. The fixing means portion of the locking mechanism may be formed at least partially within the foot on the barrel end, with the foot forming the notch for receipt of the protrusion on the end of the flexible tab.

In a further aspect of the spool, a plurality of spaced extension feet are provided, with each foot preferably forming a radial projection on the outer surface of the axial end of the barrel. Each extension foot projection is contemplated to fit within the space created by the projections within the receiving channel. Upon radial rotation of the barrel within the receiving channel, the projections and protrusions are contemplated to overlap and, in an embodiment, axially lock the barrel within the receiving channel. In other embodiments which will be described herein, at least one sliding lock is utilized to lock the barrel within the receiving channel.

Referring to the figures, where like numerals identify like elements, there is shown an embodiment of a breakdown spool designated by the numeral <NUM>. As generally shown in <FIG>, the spool <NUM> is comprised of a barrel <NUM> and one or more flanges <NUM>. Two flanges <NUM> are shown in the figures, although a functional winding spool may include only a single flange, if desired. The barrel <NUM> as shown is defined by an annular winding surface <NUM>, which is generally formed about a longitudinal axis <NUM>. The flanges <NUM> include a support surface <NUM> directed inwardly towards the winding surface <NUM> of the barrel <NUM> and a second support surface <NUM> directed outwardly away from the winding surface <NUM> of the barrel <NUM>. The winding surface <NUM> and the support surface(s) <NUM> form engagement surfaces for the elongate material (not shown) to be wound on the spool <NUM>.

In <FIG>, the spool <NUM> is shown with its constituent parts being separated. As illustrated, the barrel <NUM> includes an insertion section <NUM> on each longitudinal end <NUM>. Formed within the support surface <NUM> of each flange <NUM> is a receiving channel <NUM> having a generally circular form. The connection of one of the flanges to one end of the barrel is described below. It should be understood that in a two-flange construction, each flange will be formed in a similar fashion, as will each end of the barrel. In addition, the barrel structure is contemplated to be integrally molded. Similarly, the structure of the flange preferably has an integrally molded construction.

In <FIG>, there is shown the interaction of the insertion section <NUM> on the axial end <NUM> of the barrel <NUM> with the receiving channel <NUM> of the flange <NUM>. The barrel <NUM> is shown in section with the winding surface <NUM> directed radially outward and surrounding the longitudinal axis <NUM>. The inner portions of the barrel <NUM> define a cylindrical central hollow having an inner wall <NUM> that is preferably cylindrical. The circular channel <NUM> as shown includes an inner support wall <NUM> that is spaced radially inward from an outer wall <NUM>. As detailed further below, the space between the inner wall <NUM> and the outer wall <NUM> is formed to receive the insertion section <NUM> of the axial end <NUM> of the barrel <NUM>. Stiffening ribs <NUM> are provided radially inward of the inner wall <NUM>, with the remaining portion of the recess being open. As shown on the rear portion of the flange (opposite of the support surface), a plurality of ribs are provided to strengthen the flange. In addition, various holes or openings are provided in the wall of the central portion of the flange. These openings may provide for engagement by a drive means for the spool and gripping holes for handling the spool during use and assembly.

The insertion section <NUM> of the barrel <NUM> includes an axial end portion <NUM> and an annular ring <NUM> that projects radially outward from the winding surface <NUM> of the barrel <NUM>. The axial end portion <NUM> fits within the channel <NUM> and is positioned between the inner support wall <NUM> and the outer wall <NUM>. The annual ring <NUM> is spaced from the axial end <NUM> of the barrel <NUM> and mates with support surface <NUM> of the flange <NUM>.

A cross sectional view of the relative positioning of the insertion section <NUM> of the barrel <NUM> within the receiving channel <NUM> is shown in <FIG>. The axial end <NUM> of the insertion section <NUM> is positioned within the channel <NUM> between the inner support wall <NUM> and the outer wall <NUM>. An outwardly directed barrel tab or foot <NUM> is formed on the axial end <NUM> and projects from the barrel surface <NUM>. As shown in <FIG>, multiple feet <NUM> are provided around the circumference of the end of the barrel <NUM>. Each foot <NUM> is provided at a spaced location.

As shown in <FIG>, a space is preferably provided between the inner support wall <NUM> and the inner wall <NUM> of the barrel <NUM>. This space is created in part by the inward tapering <NUM> of the inner support wall <NUM> relative to the inner barrel wall <NUM>, which is preferably parallel to and concentric with the longitudinal axis <NUM>. The outer wall <NUM> of the receiving channel <NUM> as shown is angled <NUM> relative to the barrel wall <NUM> and thus the longitudinal axis <NUM> of the barrel <NUM>. The angle <NUM> of the outer wall <NUM> may be in the range of <NUM> to <NUM> degrees, relative to a line parallel to the longitudinal axis (<NUM>), and may be greater than the taper <NUM> of the inner support wall <NUM>.

The radial projection of the ring <NUM> is contemplated to be greater than the projection of the foot <NUM> from the barrel surface <NUM>. The top surface <NUM> of the ring <NUM> is aligned to be flush with the support surface <NUM> of the flange <NUM>, creating a continuous surface. The projected tip <NUM> of the ring <NUM> conforms to a receiving edge <NUM> of the outer wall <NUM> of the receiving channel <NUM>. The mating of the ring tip <NUM> with the receiving edge <NUM> provides axial support for the ring <NUM>. Below the ring <NUM> is created an engagement space <NUM>. In the cross section of <FIG>, the engagement space <NUM> is further refined by the position of the projecting foot <NUM>.

In <FIG>, there is shown an optional locking tab <NUM> formed as part of the body of the flange <NUM>. The locking tab <NUM> is formed within an opening <NUM> within the wall of the flange <NUM>. The tab <NUM> is cantilevered from a fixed base <NUM> and contemplated to be flexible, such that a head portion <NUM> is moveable away from the normal plane of the tab <NUM>. The tab <NUM> forms a portion of an optional locking mechanism for the barrel <NUM> and flange <NUM> by engaging means within the end of the barrel <NUM> to fix the radial position of the barrel <NUM> within the receiving channel <NUM>.

In <FIG>, the tab <NUM> is shown in cross section with the head portion <NUM> engaged within a notch <NUM> formed on the bottom surface of a foot <NUM> on the end of the barrel <NUM>. The notch <NUM> is contemplated to have defined sidewalls (not shown) such that the tab head <NUM> is engaged on all sides. The engagement of the head <NUM> of the tab <NUM> within the notch <NUM> on the foot portion <NUM>, resulting from the spring force of the tab <NUM> and the shape of the head portion <NUM> and notch <NUM>, preferably resists rotational movement between the barrel <NUM> and the flange <NUM>.

As shown in <FIG>, a radially inward protrusion or flange tab <NUM> is formed on the outer wall <NUM> of the receiving channel <NUM>. The flange tab <NUM> fits within the space <NUM> (see also <FIG>) between the ring <NUM> and the foot <NUM> on the axial end <NUM> of the barrel <NUM>. The combination of foot <NUM> and tab <NUM> forms a part of an optional locking mechanism for the barrel <NUM> and the flange <NUM>. The overlap of the foot <NUM> with the tab member <NUM> of the insertion section <NUM> within the channel <NUM> axially secures the barrel <NUM> with the flange <NUM>.

As shown in the exploded view of <FIG>, a number of inwardly directed tabs <NUM> are formed within the channel <NUM>. The tabs <NUM> are contemplated to be equidistantly spaced around the outer wall <NUM> in the channel <NUM>. The barrel <NUM> is provided with a corresponding number of feet <NUM> that are also spaced around the perimeter of the axial end <NUM> of the barrel. The spacing is contemplated to permit the barrel insertion section <NUM> to be axially inserted into the channel <NUM>, with the tabs <NUM> and feet <NUM> alternating within the channel <NUM>. In this embodiment, a radial rotation of the barrel <NUM> relative to the flange <NUM> causes each individual foot <NUM> to move under a corresponding tab <NUM> to axial lock the flange <NUM> to the barrel <NUM>. The surfaces of the tabs <NUM> and feet <NUM> may be sized and formed to create a frictional engagement as part of the overlapping relationship. This frictional locking of the tabs <NUM> within the engagement space <NUM> further secure the barrel <NUM> and flange <NUM> together, resisting a radial rotation of the parts. In an embodiment, the fixing means formed by the flexible tab <NUM> engagement with the notch <NUM> in the foot <NUM> further secures the radial position of the barrel <NUM> within the channel <NUM> of the flange <NUM>. In an embodiment, a single locking tab <NUM> is provided on the flange <NUM> and is positioned within the area of the receiving channel <NUM> between two of the inwardly directed tabs <NUM>.

The above-noted locking mechanism between the flange <NUM> and the barrel is preferably releasable. The flexibility of the tab <NUM> permits the head portion <NUM> to move away from its engagement position within the notch <NUM>, allowing the relative rotation of the flange <NUM> and the barrel <NUM>, until the rotation causes the feet <NUM> to move into the area adjacent the spaced tabs <NUM> within the channel <NUM>. Once the barrel feet <NUM> are no longer overlapping with the tabs <NUM>, the insertion end <NUM> of the barrel <NUM> may be axially withdrawn from the channel <NUM> and separated from the flange <NUM>.

The spool <NUM> as illustrated and described is an efficient assembly of two to three pieces and creates a bond between the barrel <NUM> and the flange(s) <NUM> that is strong enough to meet or exceed industry strength requirements. The assembly is created by rotating the barrel <NUM> relative to the flange(s) <NUM>. In this embodiment, the two parts are further locked into place by the engagement of the elements of the barrel insertion section <NUM> and the structures within the receiving channel <NUM>. The locking tab <NUM> engagement of the barrel axial end <NUM> may further be released for breakdown of the spool elements. Movement of the tab <NUM> is dependent on the flexibility of the tab. In an embodiment, disassembly may include the breaking of the tab to permit rotation and release. Due to at least this possibility, in an embodiment described below, a locking tab <NUM> may be utilized in combination with a sliding lock in a flange <NUM>.

The corner defined by intersection of the winding surface of the barrel and the support surface of the flange often creates a stress concentration within known spool constructions. The stress due to normal use (and disuse) may further cause unintended failure of the assembly (or molded parts). Material fatigue in the area of the barrel/flange intersection may result in damage to the material wound on the spool or cause a snag in the winding (and unwinding) operation. In the embodiments shown, a fillet is provided at the intersection of the ring <NUM> and the winding surface <NUM> of the barrel <NUM>. The radial extension of the ring <NUM> forms a start-up for the flange support surface <NUM> and separates the stress, which may be caused by deflection of the flange <NUM>, from the intersection with the barrel wall <NUM>. The angle <NUM> of the outer wall <NUM> may also serve to diminish stress concentrations. The support of the end <NUM> of the ring <NUM> by the receiving surface <NUM> on the flange serves to diminish stress on the ring <NUM>. Further, the dimensional relationships of the engagement of the insertion section <NUM> of the barrel <NUM> with the receiving channel <NUM> of the flange preferably fix the barrel and flange to form a relatively rigid spool construction.

In <FIG>, there is shown a barrel and flange combination having some different structural features from those shown in the prior figures. In <FIG> and <FIG>, a barrel <NUM>' is shown having a cylindrical winding surface <NUM>' and an insertion section <NUM>' on each end. The insertion section <NUM>' is defined by an annular ring <NUM> spaced from an axial end <NUM>' of the barrel <NUM>' and a plurality of projection feet <NUM> around the perimeter of the axial end <NUM>'. On the axial end <NUM>' of the barrel, between some or all of the adjacent feet <NUM>', is provided a plurality of engagement means <NUM>'. As more particularly shown in <FIG>, the engagement means <NUM>' is formed by a projection <NUM> positioned between two barrel detents <NUM> within the axial end <NUM>' of the barrel <NUM>'. The engagement means <NUM>' engages with additional structures on the flange (see <FIG>, discussed below) to fix the radial position of the barrel <NUM>', when locked to the flange. In some embodiments, two engagement means <NUM>' may be disposed on the axial end <NUM>' of the barrel (<FIG>). In other embodiments, one or four engagement means <NUM>' may be disposed on the axial end <NUM>' of the barrel (<FIG>).

In <FIG>, there is shown one face of a flange <NUM>' having a support surface <NUM>' surrounding a receiving channel <NUM>' for the insertion section <NUM>' of the barrel <NUM>' of <FIG> and <FIG>. The receiving channel <NUM>' is similar to that of <FIG>, having an inner support wall <NUM>', an outer wall <NUM> and a plurality of inwardly projecting tabs <NUM>' spaced around the defined channel <NUM>'. In this embodiment, a flexible tab <NUM>' is defined in the flange <NUM>' and is positioned between two locking tabs <NUM>'. The head <NUM>' of the flexible tab <NUM>' includes an opening <NUM> formed to engage a projection <NUM> on the axial end <NUM>' of the barrel <NUM>'.

In <FIG>, a portion of the flange <NUM>' is shown engaged with an end of the barrel <NUM>' of <FIG> and <FIG>. The flexible tab <NUM>' includes an opening <NUM> and is aligned within the receiving channel <NUM>' in the space between two of the inwardly projecting tabs <NUM>'. As the barrel end (<NUM>') is rotated within the receiving channel <NUM>', the feet <NUM>' rotate into the space between the bottom of the channel <NUM>' and the inwardly projecting tabs <NUM>'. The overlap of the feet <NUM>' and the inward projections <NUM>' within the channel serve as an axial locking mechanism for the barrel <NUM>' and flange <NUM>'. In the view of <FIG>, two of the feet <NUM>' are shown within openings formed in the body of the flange <NUM>'. Further locking of the barrel <NUM>' and flange <NUM>' occurs during the relative rotation of the barrel <NUM>' and flange <NUM>'. One of the projections <NUM> on the axial end <NUM>' of the barrel <NUM>' (<FIG> and <FIG>) moves into contact with the flexible tab <NUM>'. The flexible tab <NUM>' flexes to permit the projection <NUM> to move into alignment with the opening <NUM>. Once aligned, the projection <NUM> is engaged within the opening <NUM> and the radial position of the barrel <NUM>' and the flange <NUM>' is fixed.

The engagement of the flexible tab <NUM>' on the flange <NUM>' with the projection <NUM> on the axial end <NUM>' of the barrel <NUM>' is shown in <FIG>. The two barrel detents <NUM> (see <FIG>) permit the tab <NUM>' to flex to its normal position, once the projection <NUM> is positioned within the opening <NUM> on the end of the tab <NUM>'. The ring <NUM>' is spaced from the flexible tab <NUM>'. Although there are some differences in structure in the present embodiment, the end of the ring <NUM>' is contemplated to engage and align flush with the support surface of the flange in the manner shown in <FIG> and <FIG>. In addition, in the present embodiment a fillet is shown at the intersection of the ring <NUM>' and the barrel wall, as is also discussed above.

In the invention, the locking tab <NUM> and/or the flexible tab <NUM>' described above may be substituted with or may be utilized in addition to a sliding lock system <NUM>. For example, in an embodiment, the spool of the present invention may comprise a locking tab <NUM> and/or a flexible tab <NUM>' in a first position of a flange <NUM> and a sliding lock system <NUM> in a second position of the flange <NUM>, as shown in <FIG> (illustrating the flexible tab <NUM>' and the sliding lock <NUM>). The first and second positions may be opposite one another with respect to a central axis of the barrel <NUM> and/or center of the flange <NUM>. In this embodiment, the flexible tab <NUM>' may be more flexible than would ordinarily be required without use of a sliding lock <NUM> because the sliding lock system <NUM> will receive much of the torque load during rotation.

In this embodiment, the flexible tab <NUM>' may additionally serve as a flange-to-barrel alignment feature. That is, upon rotation, one of the projections <NUM> on the axial end <NUM>' of the barrel <NUM>' moves into contact with the flexible tab <NUM>'. The flexible tab <NUM>' flexes to permit the projection <NUM> to move into alignment with the opening <NUM>. Once aligned, the projection <NUM> is engaged within the opening <NUM> and the radial position of the barrel <NUM>' and the flange <NUM>' is fixed. Once aligned, the sliding lock <NUM>, described below, may be inserted.

As noted above, the locking tab <NUM> and/or the flexible tab <NUM>' may be used in connection with a sliding lock system <NUM>. One or more locking tabs and/or flexible tabs <NUM>' may be disposed on a flange which also comprises one or more sliding lock systems. Alternatively, the locking tab <NUM> and/or the flexible tab <NUM>' may be eliminated altogether and a single sliding lock system <NUM> or two or more sliding lock systems <NUM> may be disposed on the flange <NUM>.

In an embodiment, the sliding lock <NUM> is completely removable from the flange <NUM> and/or barrel <NUM>. Thus, if the sliding lock <NUM> is damaged or destroyed, the sliding lock <NUM> may be inexpensively replaced without replacement of the entire flange <NUM>. In this embodiment, a flange <NUM> which comprises a sliding lock system <NUM> may continue to be used even if an integral locking tab <NUM> and/or the flexible tab <NUM>' becomes damaged or destroyed. In an embodiment shown in <FIG>, the sliding lock system <NUM> may have a locked position (<FIG>) and an unlocked position (<FIG>). The sliding lock <NUM> is slidable between the locked and unlocked position.

In an embodiment, the sliding lock <NUM> simultaneously engages with the flange <NUM> and the barrel <NUM>. In an embodiment, at least one sliding lock <NUM> is positioned on the flange <NUM> approximately adjacent the aligned axial end portion <NUM> of the barrel <NUM>. If two or more sliding locks <NUM> are utilized, they may be positioned about the circumference of the flange <NUM> approximately adjacent the aligned axial end portion <NUM> of the barrel <NUM>. In the locked position, the sliding lock <NUM> prevents the flange <NUM> from rotating on the barrel <NUM> and also prevents disassembly of the spool <NUM>. In the unlocked position, the sliding lock <NUM> is disengaged from the barrel <NUM> (and optionally the flange <NUM>) and the spool <NUM> may be disassembled.

<FIG> illustrates a view of the aligned flange <NUM> and barrel <NUM> without the sliding lock <NUM> in place. <FIG> illustrates the aligned flange <NUM> and barrel <NUM> with the sliding lock <NUM> in its unlocked position. <FIG> illustrates an exploded view of the flange <NUM> receiving location <NUM> for the sliding lock <NUM>. The receiving location <NUM> may have a proximate end <NUM> (nearer the center of the flange <NUM> and central axis <NUM> of the barrel), a distal end <NUM> (nearer the outer circumference of the flange <NUM>), and a width W. The receiving location <NUM> may comprise an opening in the flange <NUM> wherein at least the engagement means <NUM> (more particularly the projection <NUM> and the barrel detents <NUM>) of the barrel <NUM> is visible. The opening may aid in alignment of the barrel <NUM> and flange <NUM>.

As can be seen in <FIG>, when the flange <NUM> and barrel <NUM> are aligned, at least one track <NUM> is created between the barrel detents <NUM> (within engagement means <NUM> of the barrel <NUM>) and the flange detents <NUM>. In an embodiment, two parallel tracks <NUM> are created. However, the invention is not so limited and three, four, or any number or tracks <NUM> are contemplated. In an embodiment, the receiving location <NUM> of the flange <NUM> has a pair of concentric flange detents <NUM>, as shown in <FIG>, one pair of flange detents <NUM> being located circumferentially outward of the other pair of flange detents <NUM>. Any number of concentric flange detents <NUM> may be used. That being said, the receiving location <NUM> of the flange <NUM> may comprise only one flange detent <NUM> or only one pair of flange detents <NUM> in other embodiments. Likewise, the barrel <NUM> may comprise any number of concentric barrel detents <NUM>. A plurality of concentric flange detents <NUM> or barrel detents <NUM> may increase the strength of the sliding lock system <NUM> and, thereby, the load capacity of the spool <NUM>. The number of flange detents <NUM> positioned about the circumference of the flange <NUM> in each receiving location <NUM> (not counting concentric detents) should correspond to the number of barrel detents <NUM> in an engagement means <NUM> of the barrel <NUM>, in an embodiment. For example, if two barrel detents <NUM> are utilized, two flange detents <NUM> should be utilized, creating two tracks <NUM>.

The receiving location <NUM> may be disposed in an offset portion <NUM> of the flange <NUM> which is elevated above a circumferential portion <NUM> of the flange (see <FIG>). In such an embodiment, a sidewall <NUM> (<FIG>) may connect the offset portion <NUM> and the circumferential portion <NUM> of the flange <NUM>. The receiving location <NUM> may be disposed in the offset portion <NUM> and the sidewall <NUM>. The flange detents <NUM>, for example, may be disposed in the sidewall <NUM>. Further, one or more circumferential ribs <NUM> may be disposed radially outward of the sidewall <NUM> and concentric flange detents <NUM> may be disposed in said circumferential ribs <NUM>.

In an embodiment, the flange detents <NUM> may be separated by one or more flange projections <NUM> (see <FIG>). The flange projections <NUM> may have a depth dimension. The flange projections <NUM> may be flush with or approximately flush with the offset portion <NUM> of the flange <NUM>, in an embodiment. The flange detents <NUM> may extend into the sidewall <NUM> of the flange <NUM>, in an embodiment. In an embodiment, the depth of the flange detents <NUM> is the same as or is approximately the same as the depth of the barrel detents <NUM>. In an embodiment, the width of the flange detents <NUM> is the same as or is approximately the same as the width of the barrel detents <NUM>.

In an embodiment, the barrel detents <NUM> are angled such that the sidewalls <NUM> of the barrel detents <NUM> direct inwardly. That is, the outer face of a barrel detent <NUM> (with reference to the interior and exterior of the barrel <NUM>) may be wider than the inner face of the barrel detent <NUM>. As will be understood herein, this configuration may direct the rails of the sliding lock <NUM> into the correct alignment. Any angle known in the art may be utilized in this embodiment. Likewise, in some embodiments, no such angle may be necessary. For example, <FIG> illustrates barrel detents <NUM> which are formed at right angles which correspond to the size of the rails <NUM>.

<FIG> illustrate the sliding lock <NUM> in a top view (<FIG>) and a bottom view (<FIG>). The sliding lock <NUM> comprises, in an embodiment, a central body portion <NUM> and at least one arm <NUM>, preferably two arms <NUM>. The body portion <NUM> may be generally square, rectangular, ovular, elliptical, or may have an irregular shape. The width of the body portion <NUM> may generally correspond to the width of the receiving location <NUM> in the flange <NUM> for the sliding lock <NUM>. The body portion <NUM> may comprise a proximate end <NUM>, a distal end <NUM>, and two sides <NUM>, wherein the proximate end <NUM> is closer to the central axis <NUM> of the barrel <NUM> when engaged and the distal end <NUM> is further from the central axis <NUM> of the barrel <NUM> when engaged. In an embodiment, the proximate end <NUM> of the sliding lock <NUM> comprises a lip <NUM> which has a reduced thickness as compared to the body portion <NUM>. The lip <NUM> may be designed to engage with an edge <NUM> of the offset portion <NUM> of the flange <NUM> within the receiving location <NUM> (see <FIG>). In this embodiment, the lip <NUM> may slide under the edge <NUM> of the offset portion <NUM> of the flange <NUM> to secure the sliding lock <NUM> in place. In an embodiment, the portion of the sliding lock <NUM> which contacts the edge <NUM> of the offset portion <NUM> of the flange <NUM> may be a flattened rim <NUM>. The rim <NUM> may stop upon contact with the edge <NUM> of the offset portion <NUM> of the flange <NUM>. In an embodiment, the lip <NUM> may have a plurality of reduced thicknesses or may gradually become thinner as it moves away from the body portion <NUM> toward the proximate end <NUM>.

<FIG> illustrates an embodiment wherein the lip <NUM> has an increased length, such that it secures the sliding lock <NUM> against the flange over a larger surface area. In this embodiment, the lip <NUM> may engage the flange in the locked and the unlocked positions. As shown, the extended lip <NUM> engages the underside of the flange in both the locked and the unlocked positions.

In this embodiment, the sliding lock <NUM> may be inserted into the flange receiving location <NUM> at an angle or in a tilted position (see <FIG>), with the lip <NUM> inserted first and the body portion <NUM> angled or tilted as compared to the flange surface. Once the lip <NUM> is engaged with the flange, the body portion <NUM> of the sliding lock <NUM> may then be moved into a position which is parallel to or adjacent the surface of the flange. Likewise, to remove the sliding lock <NUM> from the flange, the sliding lock must be moved into an angled position to remove the elongated lip <NUM> from the receiving location <NUM>.

In an embodiment, the sliding lock <NUM> may have an outer surface <NUM>, designed to face outwardly, away from the spool <NUM>, and an inner surface <NUM>, designed to face inwardly, toward the flange <NUM> and barrel <NUM>, when the sliding lock <NUM> is engaged. In an embodiment, the inner surface <NUM> of the sliding lock <NUM> comprises at least one rail <NUM>. In a particular embodiment, the inner surface <NUM> of the sliding lock <NUM> comprises at least two rails <NUM>. The rails <NUM> may be elongated three-dimensional elements which correspond to the shape and size of the flange detents <NUM> and barrel detents <NUM> of the barrel engagement means <NUM>. For example, the flange detents <NUM> and barrel detents <NUM> may be generally square or rectangular and the rails <NUM> may comprise rectangular prisms. Likewise, the flange detents <NUM> and barrel detents <NUM> may be generally triangular and the rails <NUM> may comprise elongated triangular pyramids. In use, the rails <NUM> slide into and through the track <NUM> created by the flange detents <NUM> and barrel detents <NUM>. This rail/track connection, once the sliding lock <NUM> is fully engaged and locked, prevents rotation of the flange <NUM> separately from the barrel <NUM>. In an embodiment, the rails <NUM> may initiate near the proximate end <NUM> of the sliding lock. In an embodiment, the rails <NUM> may initiate at or near the location of the rim <NUM> of the sliding lock <NUM>, but on the inner surface <NUM> of the body <NUM>. In an embodiment, the rails <NUM> may extend along the length of the sliding lock <NUM> and may terminate at or near the distal end <NUM> of the sliding lock. In an embodiment, the rails <NUM> extend elongate on the body portion <NUM>, along the sides <NUM> of the sliding lock.

In an embodiment, the body portion <NUM> may comprise a finger hold <NUM>. In this embodiment, the finger hold <NUM> may comprise any feature or texture which allows a user to more easily grip, hold, move, or place the sliding lock <NUM> into position (engage or disengage). In an embodiment, the finger hold <NUM> comprises a generally concave divot with a raised central portion that may be gripped between a finger and a thumb, for example. The finger hold <NUM> may allow a user to push or pull the sliding lock <NUM> along the rails <NUM> and track <NUM> or may allow a user to move the sliding lock <NUM> in and out of position, for use and storage.

In an embodiment, each arm <NUM> of the sliding lock <NUM> may initiate along an opposite side <NUM> of the proximate end <NUM> of the sliding lock <NUM> and extend along each side <NUM> of the body portion <NUM>, toward the distal end <NUM>. Each arm <NUM> may connect to the body portion at the proximate end <NUM>, but may be separated from the body portion <NUM> along each side <NUM> of the body portion. Each arm <NUM> may have flexibility such that it is biased toward an initial extended position (shown in <FIG>), but can be moved toward a compressed position by applying pressure to the arm in the direction of the body portion <NUM>. In an embodiment, each arm <NUM> may terminate at or near the distal end <NUM> of the sliding lock <NUM>. The end of each arm <NUM> may curve away from the body portion <NUM>, in an embodiment. Any shape or configuration which may be adapted to receive finger pressure may be presented, however. In an embodiment, the arms <NUM> may be repeatedly compressed using external force (finger pressure) and may extend to their biased position upon release of the external force. In an embodiment, the pressure required to compress the arms <NUM> may be determined based upon the angles between the body portion <NUM> and the arms <NUM>, the thickness of the arms, and like factors. Such may be determined on a case-by-case basis depending on the weight of the material to be wound or like factors.

In an embodiment, each arm <NUM> may have a catch <NUM>. The catch <NUM> may be disposed on the interior surface (facing toward the body <NUM>) or exterior surface <NUM> (facing away from the body <NUM>) of the arm <NUM>. The catch <NUM> may comprise any mechanism that allows movement of the sliding lock <NUM> in one direction (first direction D<NUM> (see <FIG>)), but prevents movement of the sliding lock <NUM> (without application of exterior force) in the opposite direction (a second direction D<NUM> (see <FIG>)). For example, the catch <NUM> may comprise a generally triangular feature. In an embodiment, the catch <NUM> may comprise a right triangle which allows movement of the sliding lock <NUM> such that the angled portion <NUM> (i.e. the hypotenuse) does not prevent movement in the first direction D<NUM> and, once locked, the flattened base portion <NUM> (i.e. the leg) restricts or prevents movement in the second direction D<NUM>. In an embodiment, the catch <NUM> is positioned on the arm <NUM> approximately midway between the distal end <NUM> of the sliding lock <NUM> and the proximate end <NUM> of the sliding lock <NUM>. In an embodiment, the catch <NUM> is formed integrally with the sliding lock <NUM>.

Referring to <FIG> and <FIG>, the flange <NUM> may comprise a recessed portion <NUM> along the sidewall <NUM> of the receiving location <NUM>. The recessed portion <NUM> may comprise any size or shape known in the art, but is designed to receive the catch <NUM>. Thus, the recessed portion <NUM> may comprise a recessed square, rectangle, or triangle, in an embodiment. The distal wall <NUM> (positioned furthest from the center of the flange <NUM>) of the recessed portion <NUM> may be sized and configured to match the size and configuration of the flattened portion <NUM> of the catch <NUM>. In an embodiment, a portion of sidewall <NUM> is positioned radially outward of the recessed portion <NUM>. In an embodiment, the distal wall <NUM> is perpendicular or approximately perpendicular to that of the sidewall <NUM>. In an embodiment, the width W<NUM> of the arms <NUM> may be greater than the width W<NUM> between each portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM> (see <FIG> and <FIG>). In an embodiment, the width W<NUM> of the catches <NUM> may be greater than the width W<NUM> between each portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM> (see <FIG> and <FIG>).

In an embodiment, the recessed portion <NUM> may be disposed within a perpendicular rib <NUM> which connects the circumferential rib <NUM> to the offset portion <NUM> of the flange <NUM>. The recessed portion <NUM> may extend into perpendicular rib <NUM> and away from the flange detents <NUM>. In an embodiment, the perpendicular rib <NUM> may comprise the sidewall <NUM>.

In operation, the sliding lock <NUM> may be positioned as set forth in <FIG>, with the rails <NUM> in the tracks <NUM> and manually pushed toward the center of the flange <NUM>, through the track <NUM>. If the width W<NUM> of the arms <NUM> is greater than the width W<NUM> between each portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM>, the arms <NUM> must flex inwardly to move through this space. Likewise, if the width W<NUM> of the catches <NUM> is greater than the width W<NUM> between each portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM>, the arms <NUM> must flex inwardly to move through this space. The angled portion <NUM> of the catches <NUM> should allow the catches <NUM> to slide against the portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM> while the arms <NUM> flex inwardly. This inward flex should occur without external application of lateral force to the arms <NUM> (other than the force of pushing the sliding lock radially inward). Once the apex <NUM> (see <FIG>) of the catches <NUM> pass the portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM>, the catch <NUM> enters the recessed portion <NUM>. The tension between the arm <NUM> and/or catch <NUM> and the portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM> is released and the arms <NUM> return to their extended position (see <FIG>). In some embodiments, an audible snap may be heard as the arms <NUM> return to their extended position and contact sidewall <NUM>. The rim <NUM> of the sliding lock <NUM> may stop upon contact with the edge <NUM> of offset portion <NUM> of the flange <NUM>. In an embodiment, the lip <NUM> of the sliding lock <NUM> may slide underneath the edge <NUM> of the offset portion <NUM> of the flange <NUM>. The flattened portion <NUM> of the catch <NUM> may be positioned against the distal wall <NUM> of the recessed portion <NUM> and prevents reverse movement (radially outward) of the sliding lock <NUM>. The sliding lock <NUM> cannot move radially outward with the catch <NUM> positioned within the recessed portion, against the distal wall <NUM>. In some embodiments, the distal wall <NUM> is connected to a cover portion <NUM>, which covers the catch <NUM> when the sliding lock <NUM> is in the locked position. For example, see <FIG> (locked position) and <NUM> (shown without sliding lock <NUM> in position). As can be seen in 13A, the catch <NUM> is hidden beneath the cover portion <NUM> when the sliding lock <NUM> is locked. <FIG> illustrates the underside of the sliding lock <NUM> wherein the catch <NUM> is in a locked position within the cover portion <NUM>. This feature aids in keeping the sliding lock <NUM> positioned against the flange. If someone or something should inadvertently bump or snag the arms <NUM>, the cover portion <NUM> helps to hold the arms <NUM> in position and protects the arms <NUM> from damage.

In an embodiment (see <FIG>, <FIG>, and <FIG>), the sliding lock <NUM> may one or more comprise stops <NUM> which prevent further movement of the sliding lock <NUM> radially inwardly, toward the center of the flange <NUM>, by contacting the one or more stops <NUM> with a rib or other portion of the flange <NUM> or barrel <NUM>. For example, ribs <NUM> (which may comprise partial ribs approximately sized to that of the flange projections <NUM>) are shown in <FIG> on the flange which may contact an inner surface <NUM> of the stops <NUM> on the sliding lock <NUM> to prevent further inward movement of the sliding lock <NUM>.

In another embodiment, the stops <NUM> may comprise hold-down feet which pass underneath the ribs <NUM>, <NUM>, and may secure the sliding lock <NUM> in position, against the flange. The channel <NUM> through which the stops or hold-down feet <NUM> pass is shown in <FIG>. <FIG> illustrates a top view of the sliding lock <NUM> in the locked configuration. In this embodiment, the hold-down feet <NUM> are shown disposed under the ribs <NUM>. <FIG> illustrates a top view of the sliding lock <NUM> in the unlocked configuration. In this embodiment, the hold-down feet <NUM> are shown disposed under the ribs <NUM>. <FIG> illustrates the rails <NUM> and hold-down feet <NUM> disposed under the ribs <NUM>, in a locked configuration (the top portion of the sliding lock <NUM> has been removed for viewability purposes). <FIG> illustrates the underside of the flange, with the sliding lock <NUM> in a locked position. As can be seen, the hold-down feet <NUM> are disposed in the position of the inner ribs <NUM>. In each case (locked or unlocked configuration), the hold-down feet <NUM> secure the sliding lock <NUM> in position within the flange. It will be understood that the hold-down feet <NUM> (and thus the sliding lock <NUM> itself) can be removed from the flange when the hold-down feet <NUM> are positioned between the first and second set of ribs <NUM>, <NUM>. Removal of the sliding lock <NUM> is shown in <FIG>.

In an embodiment, the stops <NUM> may be generally rectangular and may extend inwardly from the rails <NUM> toward the central body <NUM> of the sliding lock. However, any shape or configuration which prevents radial movement of the sliding lock <NUM> may be utilized.

In this position (shown in <FIG>), the sliding lock <NUM> is latched and locked in position, engaged with both the flange <NUM> and the barrel <NUM>. The flange <NUM> cannot rotate separately from the barrel <NUM>. The sliding lock <NUM> cannot be removed from the flange <NUM>/barrel <NUM> without exertion of external forces. The spool <NUM> is secure for transportation, winding, or unwinding, or any other use known in the art. The sidewall <NUM> may comprise a load-bearing wall which receives torque forces during winding and unwinding processes.

To remove the sliding lock <NUM>, in an embodiment, a user must exert pressure on at least one of the arms <NUM>, inwardly toward the central body <NUM> of the sliding lock <NUM>. This may be a compression or squeezing pressure. As the arms <NUM> move inwardly, the catches <NUM> likewise move inwardly. Once the apex <NUM> of each the catches <NUM> moves inwardly enough such that the width of the catches <NUM> (from one apex to the other apex) is less than the width W<NUM> of the portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM>, the catch <NUM> can be removed from the recessed portion <NUM> by sliding radially outwardly along the tracks <NUM>, along the portion of sidewall <NUM> that is positioned radially outward of the recessed portion <NUM>. The sliding lock <NUM> can then be slid further radially outwardly until it is disengaged from at least the barrel <NUM>. The barrel <NUM> can then be separated from the flange <NUM>, if desired.

In an embodiment, the stops <NUM> which prevent further movement of the sliding lock <NUM> toward the center of the flange <NUM> may also prevent further movement of the sliding lock <NUM> radially outwardly, away from the center of the flange, by contacting a rib or other portion of the flange <NUM> or barrel <NUM>. For example, ribs <NUM> (which may comprise partial ribs approximately sized to that of the flange projections <NUM>) are shown in <FIG> on the flange which may contact the outer surface <NUM> of the stops <NUM> on the sliding lock <NUM> to prevent further radially outward movement of the sliding lock <NUM>. Thus, in this embodiment, the sliding lock <NUM> may be slidable only between ribs <NUM> and ribs <NUM>, unless the sliding lock <NUM> is lifted out of the plane of the flange <NUM> by a user.

The sliding lock according to the invention is shown in <FIG>. The sliding lock <NUM> comprises a retaining feature <NUM> disposed on the distal end <NUM> of the sliding lock. The retaining feature <NUM> extends outwardly from the distal end <NUM>, opposite the proximate end <NUM> and the lip <NUM>. In an embodiment, the retaining feature <NUM> comprises two retaining members <NUM> which are biased to a first position (shown in <FIG>) but can flex into a flexed position (not shown) to move past a post <NUM> in a retained position (shown in <FIG>). The retaining members <NUM> may comprise elongated extensions from the distal end <NUM> of the sliding lock <NUM>. The retaining members <NUM> may be parallel or substantially parallel to one another and perpendicular or substantially perpendicular to the distal end <NUM> of the sliding lock <NUM>. The retaining members <NUM> may flex away from one another when passing over the post <NUM>. The fit between the retaining members <NUM> and the post <NUM> may comprise a snap-fit. The retaining members <NUM> may comprise textured elements on the surfaces thereof which face each other. The retaining members <NUM> may comprise a bulbous end portion <NUM> which partially surrounds the post <NUM> when the retaining feature <NUM> is engaged with the post <NUM>. The bulbous end portion <NUM> of each retaining member <NUM> may extend inwardly, toward the other retaining member <NUM>, in an embodiment. The tip <NUM> of each retaining member <NUM> may have a curved or angled surface so that the respective retaining member <NUM> slides more easily past the post <NUM>.

In an embodiment, the post <NUM> is disposed along a beam <NUM>. In an embodiment, the beam <NUM> runs perpendicular or substantially perpendicular to the ribs of the flange. In an embodiment, the ribs of the flange may be characterized as beams or vice versa. In this embodiment, the beam <NUM> may extend between each of the retaining members <NUM> when the sliding lock <NUM> is in the unlocked position (<FIG>). The beam <NUM> may provide another stabilizing feature such that the sliding lock <NUM> is less likely to be inadvertently removed from the flange or damaged when the sliding lock is in its unlocked position. The beam <NUM> and post <NUM> may be an integral part of the flange, in an embodiment.

In use, the retaining members <NUM> may allow the sliding lock <NUM> to be positioned in the unlocked position (see <FIG>) but still retained on the flange. This provides a more secure positioning and lesser likelihood of loss of the sliding lock <NUM>. The retaining feature <NUM> additionally ensures that when the sliding lock <NUM> is in the unlocked position, it is flush with and/or is disposed against the flange. This positioning prevents or reduces the likelihood that an inadvertent bump, jarring, or contact with the sliding lock <NUM> will cause the sliding lock <NUM> to become disengaged from the flange or become damaged.

In an example not part of the present invention, when not in use, such as when the flange <NUM> and barrel <NUM> are disassembled, the sliding lock <NUM> may be stored within the flange <NUM>. The sliding lock <NUM> may be stored on the inner surface of the flange <NUM> or the outer surface of the flange. The storage location <NUM> of the sliding lock <NUM> is different from the receiving location <NUM>. The storage location <NUM> of the sliding lock <NUM> is radially outward of the receiving location <NUM>.

<FIG> illustrates a sliding lock <NUM> in two positions, the arrow indicating movement between the positions. To insert the sliding lock <NUM> into its storage location <NUM> (see <FIG>), a similar mechanism is used as is described above with engaging the sliding lock <NUM>. The sliding lock <NUM> may be positioned as set forth in <FIG> and pushed toward storage base <NUM>, illustrated by the arrows. The width W<NUM> of the arms <NUM> or at least the width W<NUM> of the catches <NUM> is greater than the width W<NUM> between each retaining hook <NUM>. Accordingly, the arms <NUM> must flex inwardly to move through the space between the retaining hooks <NUM>. The angled portion <NUM> of the catches <NUM> should allow the catches <NUM> to slide against the retaining hooks <NUM> while the arms <NUM> flex inwardly. Once the apex <NUM> of the catches <NUM> pass the retaining hooks <NUM>, the catch <NUM> is retained by the hooks <NUM>. The tension between the arm <NUM> and/or catch <NUM> and the retaining hooks <NUM> is released and the arms <NUM> return to their extended position. An audible snap may be heard. At the same time, the proximate end <NUM> of the sliding lock <NUM> passes underneath a rib <NUM> which helps to secure it in position and enters the area surrounded by the storage base <NUM>.

The retaining hooks <NUM> may comprise any shape known in the art and may comprise one or more members that extend from the flange surface <NUM>. Two retaining hooks <NUM> are presented for each storage location. The retaining hooks <NUM> may comprise projections that extend outwardly from the flange surface <NUM> (i.e. perpendicular to the flange surface <NUM>) and turn angularly to form a hook portion that is parallel to or approximately parallel to the flange surface <NUM>. The angle between the projection and hook portion may be about <NUM> degrees. The hook portion retains the catch <NUM> such that the sliding lock <NUM> cannot fall away from the flange surface in a direction perpendicular to the flange surface <NUM>.

Storage base <NUM> may comprise any shape known in the art. Storage base <NUM> comprises one or more members that extend from the flange surface. The storage base <NUM> may be disposed adjunct a rib <NUM> which is perpendicular to the flange surface. The storage base <NUM> may comprise one, two, or three members. The storage base <NUM> members may generally create a square, rectangular, or trapezoid shape, in connection with the rib <NUM>. The storage base <NUM> may configured to approximate the shape and dimensions of the proximate end <NUM> of the sliding lock <NUM>. The storage base <NUM> may be discontinuous. For example, the storage base <NUM> may be disposed about the corners of the proximate end <NUM> of the sliding lock <NUM> but may be discontinuous between the corners and/or between the corners and the rib <NUM>.

As noted above, rib <NUM> may comprise an opening <NUM> through which the sliding lock <NUM> may be inserted. The opening <NUM> may be sized and configured to receive and retain the proximate end <NUM> of the sliding lock <NUM>. The rib <NUM> retains the sliding lock <NUM> body portion <NUM> such that the sliding lock <NUM> cannot fall away from the flange surface in a direction perpendicular to the flange surface <NUM>. The rib <NUM> may comprise a bridge positioned over the sliding lock <NUM> when the lock <NUM> is engaged with the storage location <NUM>.

The rim <NUM> of the sliding lock <NUM> may stop upon contact with the storage base <NUM>. The flattened portion <NUM> of the catch <NUM> prevents reverse movement of the sliding lock <NUM> against the retaining hooks <NUM>. In an example, the inner surface <NUM> of the sliding lock <NUM> is positioned outwardly in the storage location <NUM>, such that the rails <NUM> are visible when the sliding lock <NUM> is in its storage position. In other examples, the outer surface <NUM> of the sliding lock may be viewable when the sliding lock <NUM> is in its storage location (i.e. the sliding lock <NUM> may be inserted such that the outer surface <NUM> of the sliding lock <NUM> is positioned outwardly).

To remove the sliding lock <NUM> from its storage location <NUM>, a user must exert pressure on at least one of the arms <NUM>, inwardly toward the central body <NUM> of the sliding lock <NUM>. This may be a compression or squeezing pressure. As the arms <NUM> move inwardly, the catches <NUM> likewise move inwardly. Once the apex <NUM> of each the catches <NUM> moves inwardly enough such that the width of the catches <NUM> (from one apex to the other apex) is less than the width W<NUM> between the retaining hooks <NUM>, the catch <NUM> can be slid outwardly. The sliding lock <NUM> can then be slid further radially outwardly until it is disengaged from the storage base <NUM> and can be removed. The sliding lock <NUM> can then be used as described above. See <FIG> for an alternate embodiment of the storage location for the sliding lock <NUM>.

If a sliding lock <NUM> is damaged or destroyed, it may be removed from the spool <NUM> and replaced by another sliding lock <NUM>. The flange <NUM> and the barrel <NUM> may be reused. A plurality of replacement sliding locks <NUM> may be stowed within a single flange <NUM>. In an embodiment, the sliding lock <NUM> as described herein is surprisingly strong and can withstand high loads typically imparted on spool assemblies.

It is preferred that the structures of the present invention be formed with a minimum number of parts. Thus, in an embodiment, the completed spool may have a single barrel part, two flange parts, and a sliding lock. The spool parts are also contemplated to be injection molded from a thermoplastic material, such as styrene, an olefin or combination of polymer materials. Further, the structures of the barrel are preferably integrally molded. Each flange part is also integrally molded. The surfaces and structural elements of the molded parts are preferably arranged to allow for withdraw of the mold sections from the parts with a minimum of movements and mold sections.

Claim 1:
A locking system for a spool comprising:
a barrel (<NUM>) comprising a first longitudinal end and a second longitudinal end, wherein at least the first longitudinal end comprises at least one barrel detent (<NUM>);
a first flange (<NUM>) removably affixable to the first longitudinal end of the barrel (<NUM>), wherein the first flange (<NUM>) comprises at least one receiving location (<NUM>) for a sliding lock, the receiving location (<NUM>) comprising:
at least one flange detent (<NUM>), wherein the at least one flange detent (<NUM>) is aligned with the at least one barrel detent (<NUM>) to form at least one track (<NUM>); and
at least one sidewall (<NUM>) having at least one recessed portion (<NUM>); and
a sliding lock (<NUM>) comprising:
a body portion (<NUM>) comprising a proximate end, a distal end, two sides, an outer surface and an inner surface;
at least one rail (<NUM>) disposed on the inner surface of the body portion (<NUM>), wherein the at least one rail (<NUM>) is slidable in the at least one track (<NUM>);
at least one flexible arm (<NUM>), wherein the at least one arm (<NUM>) initiates near the proximate end of the body portion (<NUM>) and extends adjacent to one of the sides of the body portion (<NUM>), toward the distal end of the body portion (<NUM>);
at least one catch (<NUM>) disposed on the at least one arm (<NUM>), wherein the catch (<NUM>) is configured to slidably move into the at least one recessed portion (<NUM>) of the flange receiving location (<NUM>) and is restricted from moving out of the at least one recessed portion (<NUM>);
a retaining portion (<NUM>) extending from the distal end of the sliding lock (<NUM>), opposite the proximate end, wherein the retaining portion is configured to snap-fit onto a portion of a rib of the flange; and
a lip (<NUM>) extending from the proximate end of the sliding lock (<NUM>), opposite the distal end, wherein the lip (<NUM>) is configured to engage with the flange (<NUM>) within the receiving location (<NUM>).