Vacuum system assembly tool

Abstract

A tool for positioning a flat ring for installation of the flat ring at the end of a cylindrical body. The tool is particularly useful for the installation of gaskets between CF flanges. The tool is configured as a collar that is placed around one of the flanges, with fingers that extend to contact the outer rim of the gasket. The collar is placed around the flange, and the fingers hold the gasket in place until the second flange is moved into position and is bolted finger-tight to the first flange. At this point, the two flanges hold the gasket in place, and the collar is removed.

Claims

1. A tool for positioning a flat ring for installation of flat ring at the end of a cylindrical body, the tool comprising: a plurality of body segments each having an inner concave surface, a first finger located adjacent a first side of the inner concave surface and extending perpendicular to and away from the inner concave surface, and a second finger located adjacent an opposite second side of the inner concave surface and extending perpendicular to and away from the inner concave surface parallel to and spaced apart from the first finger, the body segments being hingedly connected to one another with the first fingers aligned with one another and the second fingers aligned with one another; and a proximal one of the body segments having a lock surface and a distal one of the body segments having a lock lever hingedly mounted thereon, the lock lever being positionable in engagement with the lock surface and pivotal to lockably engage the lock lever with the lock surface; wherein during installation of the flat ring at the end of the cylindrical body with the flat ring positioned at the end of the cylindrical body, the tool is positionable so that the lock lever is lockably engaged with the lock surface and the body segments are located to surround the end of the cylindrical body, with the first fingers bearing against the flat ring and the second fingers bearing against the cylindrical body so that the flat ring is maintained at the end of the cylindrical body by the tool.

2. The tool of claim 1, wherein the body segments include a plurality of female body segments and a plurality of male body segments hingedly connected to one another in an end to end relationship, each of the female body segments having opposite ends each defining a slot and each of the male body segments having opposite ends each defining a projection configured to be hingedly connected to one of the slots of the female body segments.

3. The tool of claim 1, wherein the body segments are hingedly connected to one another in an end to end relationship.

4. The tool of claim 1, wherein the cylindrical body comprises a tube.

5. The tool of claim 4, wherein the tube includes a flange and the second fingers engage the flange.

6. The tool of claim 1, wherein the flat ring comprises a gasket.

7. The tool of claim 1, wherein the tool is made in an assembled state with the body segments connected together by printing the tool with a three-dimensional printer comprising a print head for the body segments and a print head for a support material, wherein after printing of the assembled tool the assembled tool is exposed to a solution to dissolve the support material.

8. A method of positioning a flat ring for installation of the flat ring adjacent an end of a first cylindrical body, the method comprising the steps of: providing a flat ring positioning tool having a plurality of body segments each having an inner concave surface, a first finger located adjacent a first side of the inner concave surface and extending perpendicular to and away from the inner concave surface, and a second finger located adjacent an opposite second side of the inner concave surface and extending perpendicular to and away from the inner concave surface parallel to and spaced apart from the first finger, the body segments being hingedly connected to one another with the first fingers aligned with one another and the second fingers aligned with one another, a distal one of the body segments being lockable to a proximal one of the body segments to secure the flat ring positioning tool about a first tube; positioning the flat ring adjacent an end of a first cylindrical body; locating the positioning tool about the first cylindrical body and locating the flat ring positioned adjacent the end of the first cylindrical body so that the body segments of the positioning tool are located to surround the end of the first cylindrical body, with the first fingers supporting the flat ring and the second fingers bearing against the first cylindrical body; locking the distal one of the body segments to the proximal one of the body segments to lock the positioning tool on the first cylindrical body with the flat ring maintained at the end of the first cylindrical body by the positioning tool; securing the flat ring to the end of the first cylindrical body; and unlocking the positioning tool and removing it from the first cylindrical body and the flat ring.

9. The method of claim 8, wherein the body segments of the positioning tool include a plurality of female body segments and a plurality of male body segments hingedly connected to one another in an end to end relationship, each of the female body segments having opposite ends each defining a slot and each of the male body segments having opposite ends each defining a projection configured to be hingedly connected to one of the slots of the female body segments.

10. The method of claim 8, wherein the body segments of the positioning tool are hingedly connected to one another in an end to end relationship.

11. The method of claim 8, wherein the first cylindrical body comprises a tube.

12. The method of claim 11, wherein the tube includes a flange and the second fingers of the positioning tool engage the flange when the positioning tool is locked onto the tube.

13. The method of claim 8, wherein the flat ring comprises a gasket.

14. The method of claim 8, wherein the flat ring is installed between the end of the first cylindrical body and an abutting end of a second cylindrical body.

15. The method of claim 14, wherein the first cylindrical body and the second cylindrical body are each a tube.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Other embodiments of the invention will become apparent by reference to the detailed description in conjunction with the figures, wherein elements are not to scale so as to more clearly show the details, wherein like reference numbers indicate like elements throughout the several views, and wherein:

(2) FIG. 1 shows a tool according to the disclosure and depicts its use in positioning a flat ring at the end of a cylindrical body.

(3) FIGS. 2 and 3 are perspective views showing the tool of FIG. 1 in use for positioning a flat ring at the end of a cylindrical body.

(4) FIGS. 4 and 5 are perspective views of the tool of FIG. 1 as oriented when installed to position a flat ring.

(5) FIGS. 6 and 7 are perspective views of the tool of FIG. 1 in an uninstalled state.

(6) FIGS. 8 and 9 are exploded perspective views of the tool of FIG. 1. As referenced in the Description the tool as shown is made assembled by 3-D printing.

(7) FIGS. 10 and 11 are perspective views of a male body component of the tool of FIG. 1.

(8) FIGS. 12 and 13 are perspective views of a female body component of the tool of FIG. 1.

(9) FIG. 14 shows components of structure for locking the tool of FIG. 1 in an installed state.

(10) FIG. 15 is an exploded view of the lock structure of FIG. 14.

(11) FIGS. 16 and 17 show a body component of the lock structure of FIG. 14 that has a lock surface for engaging a lock lever of the lock structure.

(12) FIGS. 18 and 19 show a body component of the lock structure of FIG. 14 configured for having a lock lever hingedly mounted thereon.

(13) FIGS. 20 and 21 show an alternate embodiment of a tool in use for positioning a flat ring at the end of a cylindrical body.

(14) FIGS. 22 and 23 are perspective views of the tool of FIGS. 20 and 21 as oriented when installed to position a flat ring.

(15) FIGS. 24 and 25 are exploded perspective views of the tool of the tool of FIGS. 20 and 21.

(16) FIG. 26 is an exploded perspective view a flexible implement positioner according to another aspect of the invention and configured for locating implements such as gauges and the like on a cylindrical body such as tubing having CF flanges.

(17) FIGS. 27 and 28 show the flexible implement positioner of FIG. 26 installed on the CF flanges.

(18) FIGS. 29 and 30 are perspective views of the implement positioner of FIGS. 27 and 28.

(19) FIG. 31 is a perspective view of the implement positioner of FIGS. 27 and 28.

(20) FIGS. 32 and 33 are perspective views of a male body component of the implement positioner of FIGS. 27 and 28.

(21) FIGS. 34 and 35 are perspective views of a female body component of the implement positioner of FIGS. 27 and 28.

(22) FIGS. 36 and 37 are perspective views of a lock structure of the implement positioner of FIGS. 27 and 28.

(23) FIG. 38 is an exploded view of the lock structure of FIGS. 36 and 37.

(24) FIGS. 39 and 40 show a body component of the lock structure of FIG. 38 that has a lock surface for engaging a lock lever of the lock structure.

(25) FIGS. 41 and 42 show a body component of the lock structure of FIG. 38 configured for having a lock lever hingedly mounted thereon.

DETAILED DESCRIPTION OF THE INVENTION

(26) With initial reference to FIGS. 1-19, there is shown a tool 10 for positioning a flat ring such as a gasket G, relative to a cylindrical body, such as the ends of piping or tubing T having a flange F. The described use relates to a preferred use of the tool 10. It will be appreciated that the tool 10 may have other uses, such as for holding and positioning objects, such as locating workpieces together during welding or the like.

(27) In a preferred embodiment, the tool 10 is configured to overlie the curved outer surface of the flange F and to hold the gasket G in a desired position at a joint defined between abutting flanges located at the ends of tubing T as the tubing ends are joined together, with the gasket G sealing the joint between the ends of the tubing T. The flanges may be CF type flanges having knife edges that bite into the gasket G.

(28) With particular reference to FIGS. 1-9, the tool 10 includes a plurality of body segments, such as male body segments 12 and female body segments 14 hingedly connected to one another in an end to end relationship. One end of the tool 10 includes a lock body segment 16 and the opposite end of the tool 10 includes a lock body segment 18 having a lock lever 20 hingedly mounted thereon. The lock lever 20 is positionable in engagement with the lock body segment 16 and pivotal to lockably engage the lock lever 20 when installing the tool 10 on the flange F of the tubing T, as described in more detail below.

(29) With additional reference to FIGS. 10-11, the male body segments 12 each include an inner concave surface 12a, a gasket finger 12b, a flange finger 12c, and mounts 12d. The concave surface 12a is configured to conform to the curved outer surface of the flange F. The gasket finger 12b is located adjacent a first side of the inner concave surface 12a and extending perpendicular to and away from the inner concave surface 12a. The gasket finger 12b is configured to flex so as to yieldably yet firmly engage the gasket G so that when the tool 10 is installed, the pressure applied to the gasket G is uniform about the circumference of the gasket G. This avoids application of more force in one direction than another so as to not dislocate or uncenter the position of the gasket G and to preserve the location of the gasket G at the joint. The gasket finger 12b is thinner than the distance between the two abutting flanges when both knife edges of the flanges F are touching the gasket G.

(30) In a preferred embodiment, the gasket finger 12b thus includes an offset gasket contact surface 12bb that is able to flex under application of relatively light pressure. In one manner, this is achieved by having the gasket contact surface 12bb located at the end of a thin extension spaced from the main body of the finger 12b by a gap.

(31) The flange finger 12c is located adjacent an opposite second side of the inner concave surface 12a and extends perpendicular to and away from the inner concave surface 12a parallel to and spaced apart from the gasket finger 12b. The flange finger 12c is located and configured to contact the side of flange F opposite the gasket G when the tool 10 is installed on the flange F.

(32) The mounts 12d extend from the opposite ends of the male body segment 12 and are configured to extend into and pivotally engage corresponding mounts 14d of the female body segments 14. The mounts 12d are configured as rounded projections with a central aperture 12dd configured to hingedly receive a pin 14dd of the mount 14d.

(33) With additional reference to FIGS. 12-13, the female body segments 14 each include an inner concave surface 14a, a gasket finger 14b, a flange finger 14c, and the previously mentioned mounts 14d having pins 14dd.

(34) The concave surface 14a is configured to conform to the curved outer surface of the flange F. The gasket finger 14b is located adjacent a first side of the inner concave surface 14a and extends perpendicular to and away from the inner concave surface 14a. The gasket finger 14b is configured to flex so as to yieldably yet firmly engage the gasket G so that when the tool 10 is installed, the pressure applied to the gasket G is uniform about the circumference of the gasket G. This avoids application of more force in one direction than another so as to not dislocate or uncenter the position of the gasket G and to preserve the location of the gasket G at the joint.

(35) In a preferred embodiment, the gasket finger 14b is similar to the gasket finger 12b and includes an offset gasket contact surface 14bb that is able to flex under application of relatively light pressure. In one manner, this is achieved by having the gasket contact surface 14bb located at the end of a thin extension spaced from the main body of the finger 14b by a gap.

(36) The flange finger 14c is located adjacent an opposite second side of the inner concave surface 14a and extends perpendicular to and away from the inner concave surface 14a parallel to and spaced apart from the gasket finger 14b. The flange finger 14c is located and configured to contact the side of flange F opposite the gasket G when the tool 10 is installed on the flange F.

(37) The mounts 14d extend from the opposite ends of the female body segment 14 and are configured to matingly receive and pivotally engage the corresponding mounts 12d of the male body segments 14. The mounts 14d are configured as spaced apart legs that receive the mounts 12d, with the pin 14dd received by the aperture 12dd of the mount 12d.

(38) With additional reference to FIGS. 14-17, the lock body segment 16 includes an inner concave surface 16a, a gasket finger 16b, a flange finger 16c, mount 16d, and a lock surface 16e.

(39) The concave surface 16a is configured in the manner of the surfaces 12a and 14a and is configured to conform to the curved outer surface of the flange F. The gasket finger 16b is located adjacent a first side of the inner concave surface 16a and extends perpendicular to and away from the inner concave surface 16a. The gasket finger 16b is configured in the manner of the gasket fingers 12b and 14b to flex so as to yieldably engage the gasket G so that when the tool 10 is installed, the pressure applied to the gasket G is uniform about the circumference of the gasket G.

(40) The flange finger 16c is located adjacent an opposite second side of the inner concave surface 16a and extends perpendicular to and away from the inner concave surface 16a parallel to and spaced apart from the gasket finger 16b. The flange finger 16c is located and configured to contact the side of flange F opposite the gasket G when the tool 10 is installed on the flange F.

(41) The mount 16d extends from an end of the lock body segment 16 and is configured in the manner of the mounts 14d to matingly receive and pivotally engage one of the mounts 12d of an adjacent one of the male body segments 14. The mount 16d is configured as spaced apart legs that receive the mount 12d, with a pin 16dd received by the aperture 12dd of the mount 12d.

(42) The lock surface 16e is configured to lockingly engage both the lock body segment 18 and the lock lever 20. The lock surface 16e includes spaced apart stops 16ee configured to matingly engage the lock body segment 18 and spaced apart lever receivers 16eee configured to matingly engage the lever 20.

(43) With additional reference to FIGS. 14-15 and 18-19, the lock body segment 18 includes an inner concave surface 18a, a gasket finger 18b, a flange finger 18c, mount 18d, a lock surface 18e, and a lever mount 18f.

(44) The concave surface 18a is configured in the manner of the surfaces 12a, 14a, and 16a and is configured to conform to the curved outer surface of the flange F. The gasket finger 18b is located adjacent a first side of the inner concave surface 18a and extends perpendicular to and away from the inner concave surface 18a. The gasket finger 18b is configured in the manner of the gasket fingers 12b, 14b, and 16b to flex so as to yieldably engage the gasket G so that when the tool 10 is installed, the pressure applied to the gasket G is uniform about the circumference of the gasket G.

(45) The flange finger 18c is located adjacent an opposite second side of the inner concave surface 18a and extends perpendicular to and away from the inner concave surface 18a parallel to and spaced apart from the gasket finger 18b. The flange finger 18c is located and configured to contact the side of flange F opposite the gasket G when the tool 10 is installed on the flange F.

(46) The mounts 18d extends from an end of the lock body segment 18 and is configured in the manner of the mounts 12d to extend into and pivotally engage one of the mounts 14d of an adjacent female body segment 14. The mount 18d is configured as rounded projections with a central aperture 18dd configured to hingedly receive the pin 14dd of the mount 14d.

(47) The lock surface 18e is concave and shaped to matingly engage the stops 16ee, which are convex. As seen in FIG. 14, when the lever 20 is engaged with the lever receivers 16eee, which corresponds to a locked position of the lever 20, the lock surface 18e is matingly engaged with the stops 16ee.

(48) The lever mount 18f is configured as spaced apart legs having a pin 18ff received by an aperture 20aa of the lever 20.

(49) With additional reference to FIGS. 14 and 15, the lever 20 is elongate and includes a foot 20a, a trunk 20b, and a head 20c. The foot 20a includes the aperture 20aa that receives the pin 18ff of the lever mount 18f to pivotally mount the lever 20 to the lock body segment 18. The trunk 20b is narrow to fit between the space between the lever receivers 16eee and sufficiently elongate to connectedly span between the lock body segments 16 and 18. The head 20c is configured to matingly and lockingly engage the lever receivers 16eee of the lock surface 16e.

(50) In use of the tool 10 to install the gasket G, the tool 10 is installed around the flange F is positionable so that the lock body segments 16 and 18 are locked together with the lock lever 20 lockably engaged with the lock surface 16e and the body segments 12 and 14 are located to surround the flange F, with the gasket fingers 12b, 14b, 16b, and 18b bearing against the gasket G and the flange fingers 12c, 14c, 16c, and 18c bearing against the flange F so that the gasket G is maintained in position by the tool for installation of the gasket G.

(51) The tool 10 is desirably made in an assembled state as by three-dimensional printing techniques. For example, the components may made of plastic, such as thermoplastics, such as such as acrylonitrile butadiene styrene (ABS) and other polymers suitable for three-dimensional printing. The tool 10 is made in an assembled state with the body segments connected together by printing the tool 10 with a three-dimensional printer utilizing one print head for plastic and another print head for a support material. After printing of the assembled tool 10, the assembled tool is exposed to a solution to dissolve the support material. The support material and solution to dissolve the support material may be conventional support materials and solutions used in three-dimensional printing. However, it will be understood that the tool 10 may be made by other molding or manufacture techniques using a variety of materials.

(52) For example, in one example the tool 10 may be made having separately produced components, and then assembled. In this regard, and with reference now to FIGS. 20-25, there is shown an alternate embodiment of a tool 30 for positioning a flat ring such as gasket G, relative to a cylindrical body, such as the ends of piping or tubing T having flange F. The components of the tool 30 are desirably separately formed, preferably of metal, and then assembled. The overall structure of the tool 30 is substantially similar as the tool 10, except that portions of the body segments, such as the gasket fingers, connection pins and the like are separately formed and are joined to the body segments. Also, the body segments must be connected to one another, as by insertion of pins or fasteners, and the tool is not formed fully assembled in the manner of the tool 10 as manufactured by three-dimensional printing.

(53) The tool 30 includes a plurality of body segments, such as male body segments 32 and female body segments 34 hingedly connected to one another in an end to end relationship. One end of the tool 30 includes a lock body segment 36 and the opposite end of the tool 30 includes a lock body segment 38 having a lock lever 40 hingedly mounted thereon. The lock lever 40 positionable in engagement with the lock body segment 36 and pivotal to lockably engage the lock lever 40 when installing the tool 30 on the flange F of the tubing T.

(54) The male body segments 32 substantially conform to the male body segments 12, but are not of unitary construction and have the components thereof separately formed and assembled together. For example, the male body segments 32 include an inner concave surface 32a, a gasket finger 32b, a flange finger 32c, and mounts 32d. The gasket finger 32b is a separate piece and may be attached to the body segment 32 in various ways using welds or fasteners. It is preferred to include a gasket finger mount 32e on the outer surface of the body segment 32, and attach the finger 32b to the finger mount 32e as by use of a pin 32f. In this regard, the gasket finger 32b includes an aperture 32bb through which the pin 32f is passed. The flange finger 32c and mounts 32 are co-formed with the body segments 32.

(55) The female body segments 34 substantially conform to the female body segments 34, but are not of unitary construction and have the components thereof separately formed and assembled together. For example, the female body segments 34 include an inner concave surface 34a, a gasket finger 34b, a flange finger 34c, and mounts 34d having pins 34dd. The gasket finger 34b and the pins 34dd are separate components. The gasket finger 34b includes apertures 34bb through which the pins 34dd are passed.

(56) The lock body segment 36 is similar to the lock body segment 16 and includes an inner concave surface 36a, a gasket finger 36b, a flange finger 36c, mount 36d, and a lock surface 36e. The body segment 36 includes a gasket finger mount 36f on the outer surface of the body segment 36. The gasket finger mount 36f also serves as a rest for the lock lever 40 when in the locked position. The gasket finger 36b includes an aperture 36bb though which a pin 36g is passed to mount the gasket finger 36b to the mount 36f.

(57) The lock body segment 38 is similar to the lock body segment 18 and includes an inner concave surface 38a, a gasket finger 38b, a flange finger 38c, mount 38d, a lock surface 38e, and a lever mount 38f. A pin 38g is used to pivotally mount the lever 40 to the lever mount 38f.

(58) The lock lever 40 is elongate and includes a foot 40a, a trunk 40b, and a head 40c. The head 40c is a separate part and is connected to the trunk 40b by a pin 40d. The foot 40a includes aperture 40aa through which the pin 38g is passed to mount the lever 40 to the lock body segment 38.

(59) The tool 30 is installed onto the flange F and utilized in a manner similar to that described for the tool 10 to hold the gasket G in place during installation of the gasket G.

(60) Another aspect of the invention relates to providing a flexible implement positioner that is lockably installable around the abutting flanges of the abutting tubes to enable an implement, such as a temperature gauge, to be desirably positioned near the joint between the abutting flanges.

(61) With reference now to FIGS. 26-42, there is shown in accordance with another embodiment of the invention a flexible implement positioner 50 securably positionable about a juncture of two abutting ones of the tubes T having abutting flanges F. The implement positioner 50 is configured to mount to the abutting flanges F, to locate an implement between the flanges F for locating the implement to monitor the joint between the flanges F.

(62) The implement positioner 50 may be formed in the manner of the tool 10 by three-dimensional printing. Alternatively, the implement positioner 50 may be formed in the manner of the tool 30, with the components separately made and joined together using pins or other fasteners. As shown, the implement positioner is made using three-dimensional printing in the manner of the tool 10.

(63) The implement positioner includes a plurality of body segments, such as male body segments 52 and female body segments 54 hingedly connected to one another in an end to end relationship. One end of the implement positioner includes a lock body segment 56 and the opposite end of the implement positioner includes a lock body segment 58 having a lock lever 60 hingedly mounted thereon. The lock lever 60 is positionable in engagement with the lock body segment 56 and pivotal to lockably engage the lock lever 60 when installing the implement positioner on one of the flanges F.

(64) As described below, the implement positioner 50 enables the positioning of one or more implements, such as temperature gauges, pressure sensors and the like, generally represented as 62 in FIG. 28. The positioner 50 advantageously enables the positioning of one or more of the implements 62 at or closely adjacent the joint between the abutting flanges F.

(65) The male body segments 52 include an inner concave surface 52a, an implement mount 52b, flange fingers 52c, and end mounts 52d. The segments 52 are substantially the same as the segments 12, except to not include a gasket finger, and to include two flange fingers 52c for locating at the intersection of abutting flanges along with the implement mount 52b. The implement mount 52b includes an aperture 52bb to mountably receive a threaded rod or other mating structure of one of the implements 62.

(66) The female body segments 54 include an inner concave surface 54a, an implement mount 54b, flange fingers 54c, and end mounts 54d. The segments 54 are substantially the same as the segments 14, except to not include a gasket finger, and to include two flange fingers 54c for locating at the intersection of abutting flanges along with the implement mount 54b. The implement mount 54b includes an aperture 54bb to mountably receive a threaded rod or other mating structure of one of the implements 62.

(67) The lock body segment 56 includes an inner concave surface 56a, flange fingers 56c, mount 56d, and a lock surface 56e. The segment 56 is substantially the same as the segment 16, except to not include a gasket finger, and to include two flange fingers 52c for locating at the intersection of abutting flanges.

(68) The lock body segment 58 includes an inner concave surface 58a, an implement mount 58b, flange fingers 58c, mount 58d, a lock surface 58e, and a lever mount 58f. The segment 58 is substantially the same as the segment 18, except to not include a gasket finger, and to include two flange fingers 58c for locating at the intersection of abutting flanges along with the implement mount 58b. The implement mount 58b includes an aperture 58bb to mountably receive a threaded rod or other mating structure of one of the implements 62.

(69) The lock lever 60 is elongate and corresponds to the lock lever 20 and includes a foot 60a, a trunk 60b, and a head 60c. As described in connection with the lock lever 20 and the lock body segments 16 and 18, the lock body segments 56 and 58 may be locked together with the lock lever 60.

(70) The implement 62 may be optical gauges, temperature gauges, sensors, mirrors, cameras, heating devices, cooling devices, and the like. The implements may include adjustable connectors to interface with the implement mounts to further provide adjustment of the orientation or position of an implement relative to the joint.

(71) In use, the implement positioner 50 is lockably installable around the abutting flanges F of the abutting tubes T to enable one or more of the implements 62 to be desirably positioned on one or more of the implement mounts at the joint between the abutting flanges. In the manner of the tool 10, the lock body segments 56 and 58 are locked together with the lock lever 60. The body segments 62 and 64 are located to surround the adjacent flanges F. One or more implements may be attached to the implement mounts to locate the implements adjacent the joint to monitor or otherwise collect data of the joint location.

(72) In addition, the implement positioner 50 may be configured for use along a tube or the like not having flanges or not at a joint, so as to position implements at desired locations along a tube. To accomplish this the implement positioner 50 may be made as previously described, except the fingers 52c, 54c, 56c, and 58c would not be included. This configuration would advantageously be readily installable onto the outer surface of a tube or the like.

(73) The foregoing description of preferred embodiments for this invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments are chosen and described in an effort to provide the best illustrations of the principles of the invention and its practical application, and to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.