CABLE ADJUSTMENT ASSEMBLY FOR COMPOUND BOW

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The subject patent application claims priority to and all the benefits of U.S. Provisional Patent Application 63/656,674 filed on Jun. 6, 2024, which is herein incorporated by reference in its entirety.

BACKGROUND

A compound bow includes a riser and a first limb and a second limb each supported by the riser. The compound bow includes cams that are rotatably connected to the limbs. A bow string and at least one cable extend between the cams, and typically has two cables extending between the cams. Specifically, the cam has at least one track engaged with the cable and/or a bow string and at least one of the tracks is eccentric relative to the rotational axis of the cam. By drawing the bow string from a brace position to the drawn position, the bow string rotates the cams to draw in the cables and resiliently flex the limbs toward each other.

Performance of the cams of the compound bow is dependent on the relative timing of the two cams when the bow string is drawn to the drawn position. When the timing of the two cams is synchronized, the cable is taken up on the cams, e.g., the cammed tracks of the cams, according to manufacturer design. Optimal performance of the compound bow results when timing of the rotation of the two cams is synchronized when the bow string is drawn, and performance of the compound bow is degraded when the timing of the two cams is not synchronized.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an example compound bow including two cables each including an example adjustment assembly.

FIG. 2 is a perspective view of the adjustment assembly of FIG. 1.

FIG. 3 is an exploded view of the adjustment assembly of FIG. 1.

FIG. 4 is a cross-sectional view of the adjustment assembly of FIG. 1.

FIG. 5 is a perspective view of another example compound bow including two cables each including another example adjustment assembly.

FIG. 6 is a perspective view of the adjustment assembly of FIG. 5.

FIG. 7 is an exploded view of the adjustment assembly of FIG. 5.

FIG. 8 is a cross-sectional view of the adjustment assembly of FIG. 5.

DETAILED DESCRIPTION

With reference to the Figures, wherein like numerals indicate like parts throughout the several views, a compound bow 10 includes a riser 12. A first limb 14 and a second limb 16 are each supported by the riser 12. A cable assembly 118, 218 connects the first limb 14 and the second limb 16 along a longitudinal axis L of the cable assembly 118, 218. The cable assembly 118, 218 includes an adjustment assembly 120, 220 having a first unit 122, 222 and a second unit 124, 224 on a rotational axis R of the cable assembly 118, 218. The cable assembly 118, 218 includes a first cable segment 126, 226 having a terminal end 34 rotationally fixed to the first unit 122, 222. The first cable segment 126, 226 extends from the first unit 122, 222 toward the first limb 14. The cable assembly 118, 218 includes a second cable segment 128, 228 having a terminal end 36 rotationally fixed to the second unit 124, 224. The second cable segment 128, 228 extends from the second unit 124, 224 toward the second limb 16. The adjustment assembly 120, 220 includes a lock 32 between the first unit 122, 222 and the second unit 124, 224. The lock 32 is movable between a locked position and an unlocked position. The first unit 122, 222 and the second unit 124, 224 are rotatable relative to each other about the rotational axis R of the adjustment assembly 120, 220 when the lock 32 is in the unlocked position. The first unit 122, 222 and the second unit 124, 224 are fixed relative to each other about the rotational axis R of the adjustment assembly 120, 220 when the lock 32 is in the locked position.

In the example shown in the Figures, the compound bow 10 includes two cable assemblies 118, 218, as described further below. The adjustment assembly 120, 220 is adjusted to adjust the length of the cable assembly 118, 218, which adjusts the timing of cams 42, 44 of the compound bow 10, as described further below. Specifically, twisting the second unit 124, 224 and the second cable segment 128, 226 relative to the first unit 122, 222 adjusts the length of the second cable segment 128, 228. With the lock 32 in the unlocked position, the second unit 124, 224 can be rotated relative to the first unit 122, 222 to twist the second cable segment 128, 228 (and in the example shown in FIGS. 5-8, the first unit 222 can be rotated relative to the second unit 224 to twist the first cable segment 226). The first unit 122, 222 and the second unit 124, 224 may be rotated relative to each other to the desired position for desired length of the second cable segment 128, 228 (and the first cable segment 226) to set the designed length of the cable assembly 118, 218. The lock 32 is then moved to the locked position to lock 32 the position of the first unit 122, 222 to the second unit 124, 224.

A first example of the cable assembly 118 is shown in FIGS. 1-4 and a second example of the cable assembly 218 is shown in FIGS. 5-8. Similar elements in the two examples in the Figures are identified with reference numerals preceded by a 1 in FIGS. 1-4 and preceded by a 2 in FIGS. 5-8. Elements of FIGS. 1-4 can be interchangeable with elements of FIGS. 5-8. The cable assembly is not limited to the two examples shown in the Figures. Numerical adjectives such as “first” and “second,” including with reference to the limbs, the cams, the cable segments, and the units of the adjustment assembly are used herein as identifiers to distinguish components in the Figures, and the numerical adjectives do not indicate order, location, or importance.

The example, shown in FIGS. 1-4 includes two cable assemblies 118 that include the same components as each other, and the common components are identified with common reference numerals. The example, shown in FIGS. 5-8 includes two cable assemblies 218 that include the same components as each other, and the common components are identified with common reference numerals. In the example in FIGS. 1-4, one cable assembly 118 extends from the first limb 14 to the second cam 44 and the other cable assembly 118 extends from the second limb 16 to the first cam 44. With the lock 32 in the unlocked position, the second cable segment 128 of the cable assembly 118 extending from the first limb 14 to the second cam 44 is twisted to adjust the timing of the second cam 44. With the lock 32 in the unlocked position, the second cable segment 128 of the cable assembly 118 extending from the second limb 16 to the first cam 42 is twisted to adjust the timing of the second cam 44. In the example shown in FIGS. 5-8, one cable assembly 218 extends from a cammed track 80 of the first cam 42 to a circular track 78 of the second cam 44 and the other cable assembly 218 extends from a cammed track 80 of the second cam 44 to a circular track 78 of the first cam 42. With the lock 32 in the unlocked position, the first cable segment 226 and/or the second cable segment 228 of the cable assembly 218 extending from the cammed track 80 of the first cam 42 to the circular track 78 of the second cam 44 is twisted to adjust the timing of the first cam 42. With the lock 32 in the unlocked position, the first cable segment 226 and/or the second cable segment 228 of the cable assembly 218 extending from the cammed track 80 of the second cam 44 to the circular track 78 of the first cam 42 is twisted to adjust the timing of the second cam 44.

As set forth above, the compound bow 10 includes a pair of limbs, namely a first limb 14 and a second limb 16. The limbs 14, 16 flex to store energy when a bow string 46 is pulled to a drawn position, and the limbs 14, 16 deliver the energy to an arrow nocked on the bow string 46 when the bow string 46 is released. In the example shown in the Figures, merely as an example, the compound bow 10 is a vertical bow 10 and with the first limb 14 and a first cam 42 on the top of the compound bow 10 and with the second limb 16 and a second cam 44 on the bottom of the compound bow 10. The limbs 14, 16 may be split limbs 14, 16, as shown in the example in the Figures, and in other examples may be solid limbs 14, 16 or any other suitable limb design. In the examples shown in the Figures, the limbs 14, 16 include axles 76 that rotatably support the respective cam 42, 44.

The limbs 14, 16 extend from opposing ends of the riser 12. The limbs 14, 16 are supported by the riser 12, i.e., the weight of the limb is borne by the riser 12 when a user holds the riser 12. At least one cable assembly 118, 218 extends between the limbs 14, 16 and the bow string 46 extends between the limbs 14, 16. For example, two cable assemblies 118, 218 extend between the limbs 14, 16 in the example shown in the Figures. In other examples, the bow 10 may include additional cables and/or cable assemblies.

The compound bow 10 includes cams 42, 44 that are rotatably connected to the limbs 14, 16, namely the first cam 42 is rotatably connected to the first limb 14 and a second cam 44 is rotatably connected to the second limb 16. The cable assemblies 118, 218 are connected to both limbs 14, 16, either directly, e.g., to the axle 76, or indirectly, e.g., to the cam 42, 44 on the limb 14, 16. As one example, each cable assembly 118 may be directly connected to one cam and one limb, as shown in the example of FIGS. 1-4, and, as another example, the cable assembly 218 may be directly connected to both cams 42, 44, as shown in the example of FIGS. 5-8. In the example shown in FIGS. 1-4, both second cable segments 128 are directly connected to a respective one of the limbs 14, 16, for example, by attachment to the axle 76 that connects the cam 42, 44 to the limb 14, 16.

The cam 42, 44 has at least one track engaged with the cable assembly 118, 218 and/or a bow string 46 and at least one of the tracks is eccentric relative to the rotational axis of the cam 42, 44 on the axle 76. The cam in some examples may include the types that are currently known. The cams 42, 44 and can be of any suitable type. For example, the cams 42, 44 can be a single cam, hybrid cam, dual cam, binary cam, cam and a half, etc.

The bow string 46 extends between the limbs 14, 16. Specifically, the bow string 46 is directly connected to and extends between the cams 42, 44. By drawing the bow string 46 from a brace position to the drawn position, the bow string 46 rotates the cams 42, 44 to draw in the cable assembly 118, 218 and resiliently flex the limbs 14, 16 toward each other. The bow string 46 may be of any suitable type and material including, in some examples, types and materials that are currently known.

With reference to FIG. 1, the riser 12 is elongated along a riser axis A. In operation, the riser axis A is generally vertical. “Bow-rearward” is a direction from the riser 12 toward the torso and head 62 of the operator of the compound bow 10. “Bow-forward” is a direction from the riser 12 away from the torso and head 62 of the operator, i.e., the direction opposite the bow-rearward direction. The compound bow 10 has a fore-and-aft axis B that extends bow 10-rearward and bow-forward through a front face and a rear face of the riser 12. The fore-and-aft axis B is perpendicular to the longitudinal axis A. “Lateral” is a direction perpendicular to the bow-rearward and bow-forward direction along an axis perpendicular to the longitudinal axis A. The compound bow 10 has a lateral axis C that extends laterally through a left face and a right face. The lateral axis C is perpendicular to the longitudinal axis A and the fore-and-aft axis B.

The riser 12 includes a handle 48. The handle 48 is gripped by the operator of the compound bow 10 to carry the compound bow 10 and to draw the compound bow 10 from the brace position to the drawn position. The handle 48 may be unitary with the rest of the riser 12. The handle 48 is elongated generally along the longitudinal axis A of the riser 12.

The riser 12 may include an arrow shelf, as shown in the example in the figures. The arrow shelf supports an arrow when an arrow is initially nocked to the bow string 46, i.e., the weight of the arrow is at least partly borne by the arrow shelf. The arrow may abut the arrow shelf when initially nocked to the bow string 46. The arrow shelf may support the arrow when the compound bow 10 is in the drawn position. The arrow shelf is above the handle 48.

With reference to FIGS. 1-3, the riser 12 may support components of the compound bow 10. For example, the riser 12 may support a quiver, a cable guide, a string suppressor, a sight, a drop-away arrow rest, etc.

The cable assembly 118, 218 is between the first limb 14 and the second limb 16. When the bow string 46 is drawn to the drawn position, the bow string 46 rotates the cams 42, 44, which takes up the cable assembly 118, 218. When the bow string 46 is released, the cams 42, 44 rotate to let out the cable assembly 118, 218 and return to the brace position. As set forth above, the cable assembly 118, 218 includes the adjustment assembly 120, 220, the first cable segment 126, 226, and the second cable segment 28. In the example in FIGS. 1-4, the first cable segment 126 extends from the adjustment assembly 120 to the limb 14, 16, e.g., an axle that supports the respective cam 42, 44 on the respective limb 14, 16. The second cable segment 128 extends from the adjustment assembly 120 to a respective one of the cams 42, 44, e.g., to a cammed track of the cam 42, 44. In the example shown in FIGS. 5-8, the first cable segment 226 extends from the adjustment assembly 220 to one of the cams 42, 44, e.g., a cammed track of the cam 42, 44, and the second cable 228 extends from the adjustment assembly 220 to the other of the cams 42, 44, e.g., a circular track of the cam 42, 44.

The cable assembly 118, 218 has a longitudinal axis L. The cable assembly 118, 218 is elongated along the longitudinal axis L, i.e., the longest dimension of the cable assembly 118, 218 is along the longitudinal axis L. The cable assembly 118, 218 connects the first limb 14 and the second limb 16 along the longitudinal axis L of the cable assembly 118, 218. In the examples shown in the Figures, the cable assembly 118, 218 extends from one limb to one cam or from one cam to the other cam, and the longitudinal axis L of the cable assembly 118, 218 extends along the path of the cable assembly 118, 218. The cable assembly 118, 218 may engage a cable guide 52. In such an example, cable assembly 118, 218 may curve at the cable guide 52, and in such examples, the axis L of the cable assembly 118, 218 curves at the cable guide 52.

In some examples, including the examples shown in the Figures, the first cable segment 126, 226 and the second cable segment 128, 228 are discrete cables, i.e., are not separate areas of a unitary cable. In other words, in such examples, the cable segments each terminate at a terminal end at the first unit 122, 222 or the second unit 124, 224 of one of the adjustment assemblies 120, 220, as described further below. Specifically, the first cable segment 126, 226 has a terminal end 34 at the first unit 122, 222 of the adjustment assembly 120. The second cable segment 128, 228 has a terminal end 36 at the second unit 124, 224 of the adjustment assembly 120, 220.

The cable segments 126, 226, 128, 228 may each include strands that are twisted or braided together axially along the cable segment, as is known. As described below, twisting the respective cable segment shortens or lengthens the respective cable. In other words, tightening the twist of the cable segment shortens the respective cable, and loosening the twist of the cable segment lengthens the respective cable. The cable segments 126, 226, 128, 228 may be of any suitable material for compound bow cables, including synthetic polymers such as polyethylene (e.g., commercially available under the name Dyneema).

In some examples, the cable segments, i.e., the first cable segment 126 in the example shown in FIGS. 1-4, that extend from first unit 122 of the adjustment assembly 120 to the respective limb may have two tails extending from the adjustment assembly 120 to the limb. The first cable segment 126 in such an example may be referred to as a split cable design. In such an example, the ends of the first cable segment 126 may extend to opposite sides of the cam, i.e., a left side and a right side, and may engage the split limbs, e.g., at axle 76. In such an example, the first cable segment 126 extends around the first unit 122 and engages the first unit 122, e.g., in grooves 50. Strands of the first cable segment 126 may split around the first unit 122, as shown in FIG. 2. In such examples, the section of the first cable segment 126 that engages the grooves 50 is the terminal end 34 and two tails of the first cable segment 126 extend from the terminal end 34 on opposite sides of the respective cam 42, 44 to the respective limb 14, 16. In other examples, the first cable segment 226 may have one end extending from the adjustment assembly 220 to the respective cam 42, 44, as shown in the example in FIGS. 5-8. In such an example, the first cable segment 226 may engage a track, e.g., a circular track 78, on the respective cam 42, 44 such that the cable segment 226 is taken up or let out as the cam 42, 44 rotates.

As set forth above, in the examples shown in the Figures, the cable segments each terminate at a terminal end at the first unit 122, 222 or the second unit 124, 224. As one example, as shown in the example in FIGS. 1-4, the first cable segment 126 may be split around the adjustment assembly 120 at the terminal end 34. In such an example, the adjustment assembly 120, specifically the first unit 122 of the adjustment assembly 120, is embedded between strands of the first cable segment 126. In the example shown in FIGS. 1-4, the terminal end 36 of the second cable segment 28 at the second unit 124 of the adjustment assembly 120 is a knot, e.g., a Girth Hitch knot. As another example, as shown in the example in FIGS. 5-8, the terminal end 34 of the first cable segment 226 at the first unit 222 of the adjustment assembly 220 is a knot, e.g., a Girth Hitch knot. In the example in FIGS. 5-8, the terminal end 36 of the second cable segment 28 at the second unit 224 of the adjustment assembly 220 is a knot, e.g., a Girth Hitch knot.

The adjustment assembly 120, 220 has a rotational axis R that extends through the first unit 122, 222 and the second unit 124, 224. The first unit 122, 222 and the second unit 124, 224 are rotatable relative to each other about the rotational axis R. The first unit 122, 222 and the second unit 124, 224 are rotatably engaged with each other when the lock 32 is in the unlocked position. In other words, when the lock 32 is in the unlocked position, the first unit 122, 222 and the second unit 124, 224 are retained together axially along the rotational axis R and are rotatable relative to each other about the rotational axis R. In some examples, including the examples shown in the Figures, the rotational axis R of the adjustment assembly 120, 220 and the longitudinal axis of the cable assembly 118, 218 are colinear.

In the example shown in FIGS. 1-4 and the example shown in FIGS. 5-8, the first unit 122, 222 defines a first bore 54 and a second bore 56 that are coaxial with each other. The first bore 54 has a larger diameter than the second bore 56. The first unit 122, 222 has a ledge 58 between the first bore 54 and the second bore 56. The first unit 122, 222 includes a shaft 60 that extends through the second bore 56 to the first bore 54. The second unit 124, 224 includes a head 62 fixed to the shaft 60 in the first bore 54. In the example shown in the Figures, the second unit 124, 224 includes a threaded fastener including the shaft 60, which is threaded, and the head 62, and the second unit 124, 224 includes a threaded hole 64 that threadedly receives the shaft 60 of the threaded fastener. In such an example, the threaded fastener may be locked in the threaded hole, e.g., with a polymeric thread locking material, to retain the threaded fastener in position in the threaded hole 64. The outer diameter of the head 62 is smaller than the diameter of the first bore 54 so that the head 62 is rotatable relative to the second unit 124, 224 about the rotational axis R when the lock 32 is unlocked. The head 62 may have a splined or knurled surface for engaging the lock 32, as described further below.

With continued reference to the example in FIGS. 1-4 and the example in FIGS. 5-8, the second unit 124, 224 defines an eyelet 66 to which the terminal end 34 of the second cable segment 128, 228 is fixed. In the example in FIGS. 1-4, the first unit 122 defines grooves 50 to which the terminal end 34 of the first cable segment 126 is fixed at a split in the first cable segment 126. In the example shown in FIGS. 5-8, the first unit 222 defines coaxial holes 68 spaced at the first bore 54. The terminal end 34 of the first cable segment 226 is fixed to a dowel pin 70 fixed in the coaxial holes 68. As an example, the first cable segment 226 may have a knot tied to the dowel pin 70 at the terminal end 34 of the first cable segment 126.

In the examples shown in the Figures, the terminal ends 34, 36 of the cable segments are fixed to the respective adjustment assemblies 120, 220. In other words, the terminal end 34 moves as a unit with the first unit 122, 222 and the terminal end 36 move as a unit with the second unit 124, 224. Specifically, the terminal end 34 is rotationally fixed to the first unit 122, 222, i.e., rotates with the first unit 122, 222 as a unit with the first unit 122, 222, and the terminal end 34 is axially fixed to the first unit 122, 222, i.e., the terminal end 34 moves axially with the first unit 122, 222 as a unit when the cable assembly 118, 218 is in tension between the limbs 14, 16. The terminal end 36 is rotationally fixed to the second unit 124, 224, i.e., rotates with the second unit 124, 224 as a unit with the second unit 124, 224, and the terminal end 36 is axially fixed to the second unit 124, 224, i.e., the terminal end 36 moves axially with the second unit 124, 224 as a unit when the cable assembly 118, 218 is in tension between the limbs 14, 16. In the examples shown in the Figures, the terminal end 34 of the first cable segment 126, 226 is fixed to the first unit 122, 222 of the adjustment assembly 120, 220, i.e., the terminal end 34 moves as a unit with the first unit 122, 222 of the adjustment assembly 120, 220 when the first unit 122, 222 is rotated about the rotational axis R relative to the second unit 124, 224. The terminal end 36 of the second cable segment 128, 228 is fixed to the second unit 124, 224 of the adjustment assembly 120, 220, i.e., the terminal end 36 moves as a unit with the second unit 124, 224 of the adjustment assembly 120, 220 when the second unit 124, 224 is rotated about the rotational axis R relative to the first unit 122, 222. In the example shown in FIGS. 5-8, the second cable segment 228 may be shortened or lengthened by twisting.

The lock 32 is between the first unit 122, 222 and the second unit 124, 224. The lock 32 is movable between a locked position and an unlocked position. The first unit 122, 222 and the second unit 124, 224 are rotatable relative to each other about the rotational axis R of the adjustment assembly 120, 220 when the lock 32 is in the unlocked position. The first unit 122, 222 and the second unit 124, 224 are fixed relative to each other about the rotational axis R of the adjustment assembly 120, 220 when the lock 32 is in the locked position.

The adjustment assembly 120, 220 is adjusted to adjust the length of the cable segments 128, 226, 228 along the longitudinal axis L, which adjusts the timing of the cams 42, 44. In other words, the length of the second cable segment 128 in FIGS. 1-4 can be lengthened or shortened to adjust the timing of the cam 42, 44 to which the second cable segment 128 is connected. The length of the first cable segment 226 and/or the length of the second cable segment 228 in the example in FIGS. 5-8 may be adjusted to adjust the timing of the cam 42, 44 to which the second segment 228 is connected.

The lock 32 is moved to the unlocked position, which allows for the first unit 122, 222 to be rotated relative to the second unit 124, 224 to twist at least one of the cable segments. In the examples shown in the Figures, the lock 32 of the adjustment assembly 120, 220 is unlocked to allow for rotation of the second unit 124, 224 relative to the first unit 122, 222 to adjust the length of the second cable segment 28 along the longitudinal axis L and, in the example shown in FIGS. 5-8, to also allow for rotation of the first unit 222 relative to the second unit 224 to adjust the length of the first cable segment 226 and/or the second cable segment 228 along the longitudinal axis L. When one of the cable segments 128, 226, 228 is twisted, depending on the direction of rotation, the strands of that cable segment are tightened to shorten the length of the cable segment or loosened to lengthen the length of the cable segment. After relative rotation of the first unit 122, 222 and the second unit 124, 224 to the desired position for desired length of the cable assembly 118, 218, the lock 32 is then moved to the locked position to lock 32 the position of the first unit 122, 222 to the second unit 124, 224.

In some examples, the lock 32 includes a fastener 72 carried by the one of the first unit 122, 222 or the second unit 124, 224 and engageable with the other of the first unit 122, 222 or the second unit 124, 224 in the locked position. Again, as set forth above, the adjectives “first” and “second” are used herein, including in the claims, merely as identifiers to distinguish between two components of the adjustment assembly 120, 220. In the example shown in the Figures, the fastener 72 is carried by the first unit 122, 222 and is selectively engageable with the second unit 124, 224. In other examples, the second unit 124, 224, may carry the fastener 72 and the fastener 72 may be selectively engageable with the first unit 122, 222.

In examples including the fastener 72, the fastener 72 is advanced to the locked position (shown in solid lines in FIGS. 4 and 8) and retreated to the unlocked position (as shown in broken lines in FIGS. 4 and 8). For example, in the example shown in the Figures, the fastener 72 is carried by the first unit 122, 222 and is moveable relative to the second unit 124, 224 between the locked position and the unlocked position. In the locked position, the fastener 72 is engaged with the second unit 124, 224 to prevent relative rotation between the first unit 122, 222 and the second unit 124, 224, and in the unlocked position, the fastener 72 is disengaged with the second unit 124, 224 to allow relative rotation between the first unit 122, 222 and the second unit 124, 224 about the rotational axis R. In the examples shown in the Figures, the fastener 72 engages the second unit 124, 224 by abutting the first unit 124, 224.

In the examples shown in the Figures, the lock 32 includes a hole 74 in the first unit 122, 222 and the fastener 72 is advanced in the hole 74 to the locked position and retreated from the hole 74 to the unlocked position. In the examples shown in the Figures, the hole 74 and the fastener 72 may be threaded such that the fastener 72 is advanced and retreated by rotation. In such examples, the fastener 72 may be a set screw.

The hole 74 has a hole axis H transverse to the second unit 124, 224. The lock 32 is moveable along the hole axis H between the locked position and the unlocked position. For example, the fastener 72 has a fastener axis F colinear with the hole axis H, and the fastener 72 may be threadedly advanced and retracted along the hole axis H and fastener axis F between the locked and unlocked positions. In some examples, as shown in the examples in the Figures, the hole axis H and the fastener axis F may be transverse to the rotational axis R of the adjustment assembly 120, 220, i.e., intersects the rotational axis R, so that the fastener 72 can be advanced toward the rotational axis R to the locked position and retreated away from the rotational axis R to the unlocked position. In the example shown in the Figures, the hole axis H and the fastener axis F are transverse to the head 62 so that the fastener 72 can be advanced into contact with the head 62 in the locked position and retracted to be spaced from the head 62 in the unlocked position. As set forth above, the head 62 may be knurled or splined to engage the fastener 72. The fastener 72 may have a point facing the head 62 to engage the head 62.

The disclosure has been described in an illustrative manner, and it is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation. Many modifications and variations of the present disclosure are possible in light of the above teachings, and the disclosure may be practiced otherwise than as specifically described.