AU2018203601B1 - Method and apparatus for adjusting a coupling - Google Patents

Abstract

Disclosed herein is an apparatus and method for improving performance of a spigot/socket coupling 400 in which the spigot 414 is undersized relative to the socket 412, such that a three dimensional space S exists therebetween. An elongate insert 500 is provided for installation in space S. The insert 500 is configured, in use, to extend at least partially along, but only partially circumferentially around, the spigot 414. In use, the insert 500 reduces a cross-sectional area of the socket 412 available to the spigot 414 to maintain the spigot substantially in an eccentric position on a diametrically opposite side of socket 412 to a set screw 416 that is engageable with the spigot 414 to secure it in the socket. Insert 500 also extends around the set screw shaft 416a which extends into the socket 412 to constrain it against lateral deflection.

Description

Method and apparatus for adjusting a coupling

Technical Field [0001] The present disclosure relates generally to an apparatus and method for improving performance of a spigot/socket coupling in which the spigot is undersized relative to the socket. The apparatus and method were developed primarily for use in relation to a spigot/socket coupling between a street light arm and a street light lamp unit mounted to a terminal end of the arm. However, it will be appreciated that the apparatus and method may also be applied to other spigot/socket couplings.

Background [0002] Street lights commonly comprise a pole, a mounting arm extending from the pole in a cantilevered fashion, and a lamp unit connected to an end of the arm distal from the pole. It is known for the connection between the lamp unit and the mounting arm to comprise a spigot/socket coupling. Typically, the socket of the coupling is defined by a tubular mounting portion of the lamp unit and the spigot is defined by the end of the mounting arm. It is known to extend a threaded bolt through the tubular mounting portion/socket into engagement with the arm end/spigot to compress the arm end/spigot against the opposite side of the tubular mounting portion/socket and thereby to secure the arm end in the tubular mounting portion. Ideally, the longitudinal axis of the threaded bolt should extend perpendicular to a tangential plane of the arm at the point at which the bolt engages the arm.

[0003] Problems can arise when the end of the mounting arm is undersized relative to the tubular mounting portion of the lamp unit. For example, the arm end and tubular mounting portion can become misaligned. Such misalignment can cause the bolt for securing the arm end in the tubular mounting portion to engage the arm end at an angle that is not perpendicular to the tangential plane of the arm at the point of engagement. As the misaligned bolt is tightened against the arm it tends to skid around the circumference of the arm, thereby reducing the amount of force the bolt would otherwise have applied to the arm and risking damage to the bolt and the tubular mounting portion of the lamp unit. Moreover, this skidding can cause further tightening of the bolt to exacerbate misalignment of the arm and tubular mounting portion, and to lessen the compressive force applied to the arm by the bolt, thereby making it difficult or impossible to achieve sufficient compression of the arm end against the opposite side of the

2018203601 22 May 2018 tubular mounting portion to adequately secure the lamp unit to the arm end. As such, the lamp unit can be susceptible to twisting around the longitudinal axis of the arm and/or to sliding axially along the arm. In extreme cases, the lamp unit can even slide completely off the end of the arm.

[0004] Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims.

[0005] Throughout this specification:

the word comprise, or variations such as comprises or comprising, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps; and reference to a spigot being undersized relative to a socket is to be understood as meaning that the relative shapes and dimensions of the socket and the spigot are such that, when the spigot is engaged in the socket, and in the absence of other elements securing the spigot relative to the socket, the spigot is moveable relative to the socket in a direction transverse to a longitudinal axis of the spigot.

Summary [0006] Disclosed herein is a method for adjusting a coupling, the coupling comprising:

a substantially tubular member defining a socket, the socket extending into the tubular member along a longitudinal axis;

a spigot engageable in the socket, the spigot being undersized relative to the socket;

a set screw comprising:

a shaft defining a longitudinal axis of the set screw, the shaft having a male thread extending therealong, the male thread being threadedly engaged with a female thread associated with the tubular member for extension of the shaft into the socket to engage the spigot by rotation of the shaft through female thread,

2018203601 22 May 2018 a drive formation on a first end of the shaft, the first end being accessible from an exterior of the tubular member to facilitate engagement of a torque applying member with the drive formation to turn the set screw, and a spigot engagement portion on an opposite second end of the shaft for engagement with the spigot to urge the spigot to adopt an eccentric position within the socket in which the spigot is compressed between the spigot engagement portion and an inner wall of the tubular member;

a three dimensional space defined between the inner wall of the tubular member and an outer wall of the spigot when the spigot is in said eccentric position, said space including a zone extending both annularly around and axially along that portion of the set screw shaft which extends into the socket;

the method comprising:

providing an elongate insert for installation in the three dimensional space, the insert being configured, in use, to:

extend at least partially along the spigot and only partially circumferentially around the spigot, and through said zone, the installation of the insert in the space:

reducing a cross-sectional area of the socket available to the spigot substantially to a cross-sectional area of the socket occupied by the spigot when in said eccentric position, such that the presence of the insert in the three dimensional space maintains the spigot substantially in said eccentric position even if the set screw is disengaged from the spigot; and constraining said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

[0007] The method may further comprise installing the insert in said space, the installed insert: extending at least partially along the spigot and only partially circumferentially around the spigot, including extending through said zone, reducing a cross-sectional area of the socket available to the spigot substantially to a cross-sectional area of the socket occupied by the spigot when in said eccentric position, such that the presence of the insert in the three dimensional space maintains the spigot substantially in said eccentric position even if the set screw is disengaged from the spigot; and constraining said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

2018203601 22 May 2018 [0008] The insert may comprise: an outer surface for facing the inner wall of the tubular member, in use; an inner surface for facing toward the spigot, in use; and a bore extending completely through the insert in a direction from the outer surface to the inner surface, the shaft of the set screw being extendible through the bore to engage the spigot. The bore may constrain said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

[0009] The insert may be keyed relative to the tubular member to facilitate alignment of the bore with the set screw shaft.

[0010] The female thread may be provided in a female threaded component other than the tubular member. For example, the female thread may be provided in a nut or a bar. The female thread’s axis may, in use, be aligned with an unthreaded opening extending through the tubular member. The female threaded component may be located externally of the tubular member or within the socket.

[0011] The coupling may comprise two or more of the set screws spaced apart along the longitudinal axis of the socket.

[0012] The spigot and tubular member may be mechanically connected by a tether having a first end anchored relative to the spigot and a second end anchored relative to the tubular member, the mechanical connection provided by the tether surviving removal of the spigot from the socket. The spigot may be tubular so as to define a passageway therein, the tether passing from the first anchor point through the passageway and into the socket to the second anchor point. The spigot and tubular member may be mechanically connected by the tether prior to and throughout installation of the insert in the three dimensional space. The tether may comprise electrical wiring for electrically connecting an electric device associated with one of the spigot and tubular member with an electrical power source associated with the other of the spigot and tubular member.

[0013] The coupling may be used to couple a street light lamp unit to a mounting arm of a street light pole. The spigot may comprise an end of the mounting arm and the tubular member may comprise a mounting portion of the lamp unit.

2018203601 22 May 2018 [0014] The method may comprise retrofitting a pre-existing said coupling by installing the insert in the three dimensional space.

[0015] Also disclosed herein is an adjusted coupling resulting from performance of the method of any one of paragraphs [0006] to [0014] above.

[0016] Also disclosed herein is an insert for use in the method of any one of paragraphs [0006] to [0014] above or in the coupling of paragraph [0015] above, the insert being configured to: extend at least partially along the spigot and only partially circumferentially around the spigot, including extending through said zone, reduce a cross-sectional area of the socket available to the spigot substantially to a cross-sectional area of the socket occupied by the spigot when in said eccentric position, such that the presence of the insert in the three dimensional space maintains the spigot substantially in said eccentric position even if the set screw is disengaged from the spigot; and constrain said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

[0017] The insert may comprise: an outer surface for facing the inner wall of the tubular member, in use; an inner surface for facing toward the spigot, in use; and a bore extending completely through the insert in a direction from the outer surface to the inner surface, the shaft of the set screw being extendible through the bore to engage the spigot. The bore may constrain said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis. In embodiments in which the coupling comprises two or more of the set screws spaced apart along the longitudinal axis of the socket, the insert may comprise two or more of the bores, each of the bores for receiving the shaft of a respective set screw therethrough.

[0018] The insert may be keyed relative to the tubular member to facilitate alignment of the bore with the set screw shaft.

Brief Description of Drawings [0019] A description of embodiments will now be provided, by way of example only, with reference to the accompanying drawings in which:

2018203601 22 May 2018

FIG. 1 is a schematic view of a street light with which an embodiment of the method and apparatus may be used;

FIG. 2 is a perspective view showing a coupling between the lamp unit and mounting arm of the street light of FIG. 1;

FIG. 3 is a perspective view of the tubular member of the coupling of FIG. 2;

FIG. 4 is a perspective view showing an insert for the coupling of FIG. 2;

FIGS. 5 and 6 are perspective views showing the insert of FIG. 4 in the coupling of

FIG. 2; and

FIG. 7 shows a schematic longitudinal cross sectional view taken along a vertical plane passing through the centre of the assembly of FIGS. 5 and 6.

Description of Embodiments [0020] Referring to the drawings, there is shown a street light 100 comprising a pole 200, a mounting arm 202 extending from the pole, and a lamp unit 300 connected to an end of mounting arm 202 by a coupling 400. The coupling 400 comprises a substantially tubular member 410 defining a socket 412 that extends into the tubular member along a longitudinal axis A. A spigot 414 is engageable in the socket 412, the spigot being undersized relative to the socket. In the illustrated embodiment, spigot 414 comprises an end of the mounting arm 202 and tubular member 410 comprises a mounting portion of the lamp unit 300.

[0021] Spigot 414 and tubular member 410 are mechanically connected by a tether, in the form of electrical wiring 302 for electrically connecting the lamp unit 300 to an electrical power source. The wiring 302 has a first end anchored relative to the spigot 414, such as to an electrical terminal in the base of pole 200, and a second end anchored relative to the tubular member 410, such as to an electrical terminal of lamp unit 300, which is mounted adjacent the base 412a of socket 412. In the illustrated embodiment, the spigot 414 is tubular so as to define a passageway therein, the wiring 302 passing from the first anchor point, through the passageway in spigot 414, and into the socket 412 to the second anchor point. The wiring 302 is of sufficient length to allow lamp unit 300 to be removed from the mounting arm 202, by sliding the tubular member

2018203601 22 May 2018

410 off the spigot 414 without requiring the wiring to be mechanically disconnected. In other words, the mechanical connection provided by the wiring 302 is configured to survive removal of the spigot 414 from the socket 412.

[0022] The coupling 400 comprises set screws 416, each comprising a male threaded shaft 416a threadedly engaged with a female thread 416b associated with the tubular member 410 for extension of the shaft along an axis B into the socket 412 to engage the spigot 414 by rotation of the male threaded shaft through female thread. A drive formation, such as a polygonal, slotted, Phillips, or Torx drive formation, is provided on a first end 416c of the set screw shaft 416a. The first end 416c of the shaft, and thereby the drive formation, is accessible from an exterior of the tubular member 410 to facilitate engagement of a torque applying member with the drive formation to actuate the set screw 416. A spigot engagement portion 416d is provided on an opposite second end of the shaft 416a for engagement with the spigot 414 to urge the spigot to adopt an eccentric position within the socket 412 in which the spigot 414 is compressed between the spigot engagement portion 416d and an inner wall 410a of the tubular member 410. As shown in FIG. 2, a three dimensional space S is defined between the inner wall 410a of the tubular member 410 and an outer wall of the spigot 414 when the spigot is in the eccentric position. Space S includes a zone Z extending both annularly around and axially along that portion of the set screw shaft 416a which extends into the socket 412.

[0023] An elongate insert 500 is provided for installation in the three dimensional space S. The insert is configured, in use, to extend at least partially along, but only partially circumferentially around, the spigot 414, including through zone Z. The insert 500 being configured such that, when installed in the space S, the insert:

reduces a cross-sectional area of the socket 412 available to the spigot 414 substantially to the cross-sectional area of the socket occupied by the spigot when in the eccentric position shown in FIG. 2, such that the presence of the insert 500 in the three dimensional space S maintains the spigot 414 substantially in this eccentric position even if the set screws 416 are disengaged from the spigot; and constrains the portion of the set screw shaft 416a which extends into the socket 412 against deflection away from axis B.

[0024] In use, an outer surface 502 of the insert 500 faces the inner wall 410a of the tubular member, and an inner surface 504 of the insert faces the spigot 414. Bores 506, each for alignment with a respective one of the set screws 416, in use, extend completely through the

2018203601 22 May 2018 insert 500 in a direction from the outer surface 502 to the inner surface 504. In use, the shafts of set screws 416 extend through the bores 506 to engage the spigot 414. The bores 506 constrain the portion of the set screw shafts 416a which extend through zone Z against deflection away from axis B.

[0025] The insert 500 is keyed relative to the tubular member 410 to facilitate alignment of the bores 506, angularly about axis A, with the set screw shafts 416a. In the illustrated embodiment, this keying is provided by a portion of the inner surface 410a of the tubular member 410 within space S being non-arcuate, in cross section transverse to axis A, and the outer surface 502 of the insert 500 being of complimentary shape so as to engage therewith to limit relative rotation between the insert 500 and the tubular member 410 when the bores 506 are aligned with the set screw shafts 416a. The insert 500 is also provided with an abutment surface 508 for engaging a corresponding abutment surface 412a associated with the socket 412 to facilitate alignment of the bores 506, axially along axis A, with the set screw shafts 416a. In the illustrated embodiment, the abutment surfaces are defined, respectively, by an inclined end 508 of insert 500 and a corresponding angled base 412a of socket 412. Abutment of insert end 508 with socket base 412a stops axial insertion of the insert 500 into the socket 412 at a position corresponding with alignment of the bores 506, axially along axis A, with the set screw shafts 416a. Insert 500 is also configured such that, when end 508 with socket base 412a, its other end 510 is substantially flush with the end of tubular member 410 from which socket 412 extends thereinto.

[0026] Insert 500 is configured relative to the tubular member 410 to facilitate visual confirmation that an insert is installed in the tubular member. For example, in the illustrated embodiment, insert 500 is a contrasting colour, ideally a bright colour, to the tubular member 410.

[0027] In the illustrated embodiment, the female threads 416b are provided in a bar 416e installed adjacent the inner surface 410a of tubular member 410, the bar extending parallel to axis A. Also, lock nuts 416f are provided on the first end 416c of each set screw shafts for tightening against an outer surface of the tubular member 410. Unthreaded openings 410b extend through the tubular member 410, openings 410b being aligned with axes B, in use, to facilitate engagement of a torque applying member with the set screws 416.

[0028] The insert 500 can be provided in coupling 400 upon initial mounting of lamp unit 300 to mounting arm 202. However, and particularly advantageously, the insert 500 can be retrofitted

2018203601 22 May 2018 in a pre-existing coupling 400 without needing to disconnect the electrical wiring 302 that tethers the spigot 414 to the tubular member 410.

[0029] It will be appreciated that an insert 500 to be installed in space S of a coupling 400 must be of an appropriate configuration relative to space S in order for the insert to perform in the manner described above. For example, space S will vary in different couplings 400, such as due to differences in the shape of the socket or in the extent to which the spigot in undersized relative to the socket. Therefore, when providing an insert 500 for a particular coupling 400, the insert provided must have a configuration suitable for space S of that coupling. For example, in a coupling 400 with a relatively small space S (i.e., a coupling in which the spigot 414 is less undersized relative to the socket 412), a smaller insert 500 will be required, and vice versa for a coupling 400 with a relatively large space S (i.e., a coupling in which the spigot 414 is more undersized relative to the socket 412).

[0030] The steps involved in retrofitting an insert 500 in a pre-existing coupling 400 will now be described. First, lock nuts 416f are loosened, and set screws 416 are loosened until the spigot engagement portions 416d are substantially flush with the surface of bar 416e facing toward the spigot 414. The lamp unit 300 is then removed from the mounting arm 202, without disconnecting wiring 302, by sliding the tubular member 410 off the spigot 414. The insert 500 is then inserted in socket 412 of tubular member 410, again without disconnecting wiring 302, until its bores 506 align with the set screws 416, which alignment occurs automatically as described above. The lamp unit 300, with the insert 500 installed its socket 412, is then slid back onto the spigot 414, again without disconnecting wiring 302. The set screws 416 are then retightened into engagement with the spigot 414 to compress the spigot between the spigot engagement portions 416d and the inner wall 410a of the tubular member 410 on a diametrically opposite side of the spigot 414 to the set screws 416. The lock nuts 416f are then retightened to resist unintentional loosening of the set screws 416.

[0031] It will be appreciated that the presently disclosed method and apparatus allow the spigot 414 and tubular member 410 to remain mechanically connected by the wiring 302 prior to and throughout installation of the insert 500 in the three dimensional space S. Accordingly, the need to disconnect the wiring 302 during adjustment of the coupling by installation of the insert 500 is avoided. As substantial labour time, incurred by qualified electricians, is associated with disconnection and reconnection of the wiring 302, avoiding the need to disconnect the wiring 302 saves substantial time and cost. In contrast, installation of the insert 500 does not need to be ίο

2018203601 22 May 2018 performed by an electrician and can be performed in a fraction of the time associated with disconnection and reconnection of the wiring 302. Moreover, interaction between the insert 500, tubular member 410, spigot 414 and set screws 416 facilitate engagement of the set screws 416 with the spigot 414 at an angle perpendicular to the tangent plane of the spigot at the point at which the set screw shafts engage the spigot, and facilitate secure connection between the set screws 416, spigot 414 and tubular member 410, by:

• the presence of the insert 500 in the space S maintaining the spigot 414 in the desired eccentric position in the socket 412, in which eccentric position axis B defined by the set screws 416 passes diametrically through the spigot 414; and • the set screw shafts 416a being guided toward the eccentrically disposed spigot 414 by the bores 506, wherein the bores 506 also serve to inhibit the spigot engagement portions 416d of the set screws from skidding around the spigot 414 irrespective of the angle at which the set screw shafts engage the spigot.

[0032] It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the above-described embodiments, without departing from the broad general scope of the present disclosure. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Examples of possible modifications and/or variations include, but are not limited to:

• at least part of the insert 500 extending completely around the spigot 414, in use, but wherein this part of the insert is openable, such as by being formed from two portions that are hingedly connected to facilitate their movement relative to one another between an open and closed configuration, during installation of the insert to allow the lamp unit’s wiring to be fed longitudinally through the insert without the wiring having to be disconnected;

• the bar 416e being provided on the outside of tubular member 410;

• the bar 416e being spaced inwardly from the inner surface 410a, for example being accommodated in an opening that extends longitudinally through the insert; and/or • the bar 416e being substituted by female threads in the tubular member 410 or in a pair of nuts spaced apart along axis A.

2018203601 17 Jan 2019

Claims (19)

1. A method for adjusting a coupling, the coupling comprising:

a substantially tubular member defining a socket, the socket extending into the tubular member along a longitudinal axis;

a spigot engageable in the socket, the spigot being undersized relative to the socket;

a set screw comprising:

a shaft defining a longitudinal axis of the set screw, the shaft having a male thread extending therealong, the male thread being threadedly engaged with a female thread associated with the tubular member for extension of the shaft into the socket to engage the spigot by rotation of the shaft through female thread, a drive formation on a first end of the shaft, the first end being accessible from an exterior of the tubular member to facilitate engagement of a torque applying member with the drive formation to turn the set screw, and a spigot engagement portion on an opposite second end of the shaft for engagement with the spigot to urge the spigot to adopt an eccentric position within the socket in which the spigot is compressed between the spigot engagement portion and an inner wall of the tubular member;

a three dimensional space defined between the inner wall of the tubular member and an outer wall of the spigot when the spigot is in said eccentric position, said space including a zone extending both annularly around and axially along that portion of the set screw shaft which extends into the socket;

the method comprising:

providing an elongate insert for installation in the three dimensional space, the insert being configured, in use, to:

extend at least partially along the spigot and only partially circumferentially around the spigot, and through said zone, the installation of the insert in the space:

reducing a cross-sectional area of the socket available to the spigot substantially to a cross-sectional area of the socket occupied by the spigot when in said eccentric position, such that the presence of the insert in the three dimensional space maintains the spigot substantially in said eccentric position even if the set screw is disengaged from the spigot; and

2018203601 17 Jan 2019 constraining said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

2. The method of claim 1, further comprising installing the insert in said space, the installed insert:

extending at least partially along the spigot and only partially circumferentially around the spigot, including extending through said zone, reducing a cross-sectional area of the socket available to the spigot substantially to a cross-sectional area of the socket occupied by the spigot when in said eccentric position, such that the presence of the insert in the three dimensional space maintains the spigot substantially in said eccentric position even if the set screw is disengaged from the spigot; and constraining said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

3. The method of claim 1 or claim 2, wherein the insert comprises: an outer surface for facing the inner wall of the tubular member, in use; an inner surface for facing toward the spigot, in use; and a bore extending completely through the insert in a direction from the outer surface to the inner surface, the shaft of the set screw being extendible through the bore to engage the spigot.

4. The method of claim 3, wherein the bore constrains said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

5. The method of claim 3 or claim 4, wherein the insert is keyed relative to the tubular member to facilitate alignment of the bore with the set screw shaft.

6. The method of any one of the preceding claims, wherein the female thread is provided in a female threaded component other than the tubular member.

7. The method of any one of the preceding claims, wherein the female thread’s axis, in use, is aligned with an unthreaded opening extending through the tubular member.

8. The method of any one of the preceding claims, wherein the spigot and tubular member are mechanically connected by a tether having a first end anchored relative to the spigot and a

2018203601 17 Jan 2019 second end anchored relative to the tubular member, the mechanical connection provided by the tether surviving removal of the spigot from the socket.

9. The method of claim 8, wherein the spigot is tubular so as to define a passageway therein, the tether passing from the first anchor point through the passageway and into the socket to the second anchor point.

10. The method of claim 8 or claim 9, wherein the spigot and tubular member are mechanically connected by the tether prior to and throughout installation of the insert in the three dimensional space.

11. The method of any one of claims 8 to 10, wherein the tether comprises electrical wiring for electrically connecting an electric device associated with one of the spigot and tubular member with an electrical power source associated with the other of the spigot and tubular member.

12. The method of any one of the preceding claims, wherein the coupling is used to couple a street light lamp unit to a mounting arm of a street light pole.

13. The method of claim 12, wherein the spigot comprises an end of the mounting arm and the tubular member comprises a mounting portion of the lamp unit.

14. The method of any one of the preceding claims, comprising retrofitting a pre-existing said coupling by installing the insert in the three dimensional space.

15. An adjusted coupling resulting from performance of the method of any one of the preceding claims.

16. An insert for use in the method of any one of claims 1 to 14 or in the coupling of claim

15, the insert being configured to:

extend at least partially along the spigot and only partially circumferentially around the spigot, including extending through said zone, reduce a cross-sectional area of the socket available to the spigot substantially to a cross-sectional area of the socket occupied by the spigot when in said eccentric position, such

2018203601 17 Jan 2019 that the presence of the insert in the three dimensional space maintains the spigot substantially in said eccentric position even if the set screw is disengaged from the spigot; and constrain said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

17. The insert of claim 16, comprising: an outer surface for facing the inner wall of the tubular member, in use; an inner surface for facing toward the spigot, in use; and a bore extending completely through the insert in a direction from the outer surface to the inner surface, the shaft of the set screw being extendible through the bore to engage the spigot.

18. The insert of claim 16 or claim 17, wherein the bore constrains said portion of the set screw shaft which extends into the socket against deflection away from the female thread’s axis.

19. The insert of any one of claims 16 to 18, the insert being keyed relative to the tubular member to facilitate alignment of the bore with the set screw shaft.

1/5

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100

302

A

FIG. 1

2/5

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416

FIG. 3

416

3/5

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416

4/5

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FIG. 6

5/5

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FIG. 7 410b