Patent Publication Number: US-10759628-B2

Title: Link coupler, chainwheel, and assembly thereof for coupling and moving chains of different sizes

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims the benefit of U.S. Provisional Patent Application No. 62/555,408, filed on Sep. 7, 2017, the entirety of which is incorporated herein by reference. This application also claims priority to, as a Continuation-in-part (CIP) of, U.S. patent application Ser. No. 15/431,145 (pending), filed on Feb. 13, 2017, the entirety of which is incorporated herein by reference, which itself claims the benefit of U.S. Provisional Patent Application No. 62/294,759, filed on Feb. 12, 2016, the entirety of which is incorporated herein by reference. 
    
    
     FIELD 
     The present disclosure relates to a link coupler for coupling two lengths of chain, a chainwheel for engaging and moving chain, and to an assembly thereof for coupling and moving chain, as well as to methods of making and using the same. 
     BACKGROUND 
     There are many situations in which relatively long lengths of chains are required. A common situation arises in marine applications, particularly in the mooring or anchoring of vessels in deep water, which is often required in the off-shore drilling and production of hydrocarbons. In off-shore drilling operations, platforms or spar buoys (e.g., for floating production, drilling or construction operations) are typically moored at a desired location using chains that are secured between the platform or spar buoys and anchors that are positioned on the ocean floor. In such installations, the anchor lines are installed by passing a messenger chain or rope from the deck, through a chainwheel, and out to a pre-installed anchor or mooring on the ocean floor. A connecting link secures the messenger chain to the anchor chain. The messenger chain is then hauled back to the platform; thereby, pulling the anchor chain towards the platform as well. Both the messenger chain and anchor chain pass through the same chainwheel. As the messenger chain has a lower capacity, it is usually smaller than the anchor chain. 
     BRIEF SUMMARY 
     An embodiment of the present disclosure includes an assembly for coupling two lengths of different sized chain together and moving the two lengths of different sized chain together. The assembly includes a dual chainwheel, which includes a small wildcat profile and a large wildcat profile. The assembly includes a link coupler. The link coupler includes a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. The assembly includes a small chain coupled with the small-chain link coupler, and a large chain coupled with the large-chain link coupler. Engagement of the link coupler with the large wildcat profile positions the large chain along a path defined by the large wildcat profile. 
     Another embodiment of the present disclosure includes a method for coupling two lengths of different sized chain together and moving the two lengths of different sized chain together. The method includes providing a link coupler. The link coupler includes a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. The method includes coupling a small chain with the small-chain link coupler, and coupling a large chain with the large-chain link coupler. The link coupler coupled with the small chain and the large chain forms a chain assembly. The method includes engaging the chain assembly with a dual chainwheel. The dual chainwheel includes a small wildcat profile and a large wildcat profile. The method includes hauling-in or paying-out the chain assembly. 
     Another embodiment of the present disclosure includes a link coupler for coupling two lengths of different sized chain together and facilitating movement of the two lengths of different sized chain. The link coupler includes a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. The small-chain link coupler is sized to couple with a small chain and the large-chain link coupler is sized to couple with a large chain. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       So that the manner in which the features and advantages of the system, products, apparatus, and/or methods of the present disclosure may be understood in more detail, a more particular description briefly summarized above may be had by reference to the embodiments thereof which are illustrated in the appended drawings that form a part of this specification. It is to be noted, however, that the drawings illustrate only various exemplary embodiments and are therefore not to be considered limiting of the disclosed concepts as it may include other effective embodiments as well. 
         FIG. 1A  is a perspective view of a link coupler. 
         FIG. 1B  is a perspective view of a portion (body) of the link coupler of  FIG. 1A . 
         FIG. 1C  is a side view of a chain link. 
         FIG. 1D  is a simplified, side view of a portion of a large-chain link coupler. 
         FIG. 1E  is a simplified, side view of a portion of a small-chain link coupler. 
         FIG. 1F  is another perspective view of a portion (body) of the link coupler of  FIG. 1A . 
         FIG. 1G  is another perspective view of a portion (body) of the link coupler of  FIG. 1A . 
         FIG. 1H  is another perspective view of the link coupler of  FIG. 1A . 
         FIG. 1I  is another perspective view of the link coupler of  FIG. 1A . 
         FIGS. 1J-1M  depict a link coupler coupled with both a small and large chain. 
         FIG. 2A  is a perspective view of an assembly that includes a link coupler engaged with a dual chainwheel, with the link coupler coupled with a small chain that is engaged with the dual chainwheel and a large chain that is disengaged from the dual chainwheel. 
         FIG. 2B  is a detail view of section A of  FIG. 2A . 
         FIG. 2C  is a side, cross-sectional view of the assembly of  FIG. 2A . 
         FIG. 3A  is a perspective view of the same assembly of  FIG. 2A , but with the link coupler, the small chain, and the large chain each engaged with the dual chainwheel. 
         FIG. 3B  is a detail view of section B of  FIG. 3A . 
         FIG. 3C  is a side, cross-sectional view of the assembly of  FIG. 3A . 
         FIG. 4A  is a perspective view of the same assembly of  FIG. 2A , but with the link coupler and the large chain each engaged with the dual chainwheel, and the small chain disengaged from the dual chainwheel. 
         FIG. 4B  is a detail view of section C of  FIG. 4A . 
         FIG. 4C  is a side, cross-sectional view of the assembly of  FIG. 4A . 
         FIG. 5  is a perspective view of a rotary chain jack with a link coupler engaged with a chainwheel thereof. 
         FIG. 6A  is a sectional, front view of a rotary chain jack during haul-in, with the link coupler of the mooring line in transition. 
         FIG. 6B  is a sectional, side view of the rotary chain jack of  FIG. 6A . 
         FIG. 7  is a perspective view of a rotary chain jack or windlass including a chain stopper and a link coupler engaged with a chainwheel thereof. 
         FIG. 8  is another perspective view of the rotary chain jack or windlass with the link coupler of  FIG. 7 . 
         FIG. 9  is a perspective view of a dual chain mooring windlass with a link coupler engaged with a chainwheel thereof. 
         FIG. 10  is a sectional, front view of a dual chain mooring windlass during transition from hauling in a messenger chain to hauling in a mooring chain, including a link coupler engaged with a chainwheel thereof. 
         FIG. 11  is a sectional, side view of the dual chain mooring windlass during transition from hauling in the messenger chain to hauling in the mooring chain of  FIG. 10 . 
         FIG. 12  depicts a driven mode chain wheel. 
         FIGS. 13A and 13B  depict an assembly of a link coupler coupled with a small and large chain, with the assembly engaged with a chain wheel in a perpendicular orientation. 
         FIGS. 14A and 14B  depict an assembly of a link coupler coupled with a small and large chain, with the assembly engaged with a chain wheel in a parallel orientation. 
         FIGS. 15A-23B  depict an assembly of a link coupler coupled with a small and large chain, with the assembly engaged with a chain wheel in a perpendicular orientation as the assembly moves through the chain wheel in driven mode. 
         FIGS. 24A-31B  depict an assembly of a link coupler coupled with a small and large chain, with the assembly engaged with a chain wheel in a parallel orientation as the assembly moves through the chain wheel in driven mode. 
         FIG. 32  depicts a driving mode chain wheel. 
         FIGS. 33A-51B  depict an assembly of a link coupler coupled with a small and large chain, with the assembly engaged with a chain wheel in a perpendicular orientation as the assembly moves through the chain wheel in driving mode. 
     
    
    
     Products, systems, apparats, and methods according to present disclosure will now be described more fully with reference to the accompanying drawings, which illustrate various exemplary embodiments. Concepts according to the present disclosure may, however, be embodied in many different forms and should not be construed as being limited by the illustrated embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough as well as complete and will fully convey the scope of the various concepts to those skilled in the art and the best and preferred modes of practice. 
     DETAILED DESCRIPTION 
     The present disclosure provides for a link coupler for coupling two lengths of different sized chain together, to a chainwheel for engaging and facilitating movement of multiple, different sized chains, and to an assembly of the link coupler and chainwheel for coupling and facilitating movement of multiple, different sized chains. The present disclosure also provides methods of making and using the link coupler, the chainwheel, and the assemblies thereof. 
     Link Coupler 
     Certain embodiments of the present disclosure include a link coupler, also referred to as a connecting link assembly, for coupling multiple links of different sized chains together, and for facilitating movement thereof. With reference to  FIGS. 1A-1I , link coupler  1000  and portions thereof are depicted. Link coupler  1000  has first end  1012  and second end  1013 . At first end  1012 , link coupler  1000  includes small-chain link coupler  1007  and, at second end  1013 , link coupler  1000  includes large-chain link coupler  1006 . One skilled in the art would understand that the small-chain and small-chain link coupler are defined relative to the large-chain and large-chain link coupler, such that the small-chain is smaller relative to the large-chain and the small-chain link coupler is smaller relative to the large-chain link coupler, and that the absolute sizes of the small-chain, large-chain, small-chain link coupler and large-chain link coupler may vary depending on the particular application at hand. 
     As would be understood by one skilled in the art, chains are sized according to diameter  1014  (i.e., thickness of chain link), coil  1015  (i.e., link opening size), or combinations thereof. Small-chain link coupler  1007  is configured (i.e., sized, shaped, and arranged) to couple with a small-chain. That is, small-chain link coupler  1007  may have a diameter  1014 , coil  1015 , or combinations thereof sized, shaped, and arranged to engage (i.e., link) with a link of a small-chain, such as a messenger chain used in the mooring of floating vessels or platforms. For example, small-chain link coupler  1007  may have the same or substantially the same diameter, coil, or combinations thereof as a link of the small-chain engaged therewith. 
     Large-chain link coupler  1006  is configured (i.e., sized, shaped, and arranged) to couple with a large-chain. That is, large-chain link coupler  1006  may have a diameter  1014 , coil  1015 , or combinations thereof sized, shaped, and arranged to engage (i.e., link) with a link of a large-chain, such as an anchor chain used in the mooring of floating vessels or platforms. For example, large-chain link coupler  1006  may have the same or substantially the same diameter, coil, or combinations thereof as a link of the large-chain engaged therewith. 
     While both small-chain link coupler  1007  and large-chain link coupler  1006  are shown as having the form of a link of a chain, or a partial link of a chain (D-link), one skilled in the art would understand that the small and large chain link couplers disclosed herein are not limited to these particular structures, and that the small and large chain link couplers may have any structure capable of engaging (e.g., securely engaging) a chain. In operation, when two chains are engaged with link coupler  1000  (i.e., a small-chain at first end  1012  and a large-chain at second end  1013 ) the coupling between the small and large chains and link coupler  1000  may be sufficiently secure such that the chains remain coupled to link coupler  1000  while being moved (i.e., hauled-in and/or paid-out) under load. 
     Link coupler  1000  includes body  1001 . Body  1001  has first end  1002 , second end  1003 , top  1004   a , bottom  1004   b , first side  1005   a , and second side  1005   b . First end  1002  is relatively smaller than second end  1003  and includes a through-hole  1020  for coupling with small-chain link coupler  1007 . When body  1001  is coupled with small-chain link coupler  1007 , pin  1011   a  (also referred to as a tab) is positioned within through-holes (not shown) on each end of small-chain link coupler  1007  and within through-hole  1020  at first end  1002  of body  1001 . As such, small-chain link coupler  1007  is movably (e.g., pivotably) coupled with body  1001  via pin  1011   a , such that small-chain link coupler  1007  pivots about pin  1011   a.    
     Second end  1003  is relatively larger than first end  1002  and includes a through-hole  1030  for coupling with large-chain link coupler  1006 . When body  1001  is coupled with large-chain link coupler  1006 , pin  1011   b  (also referred to as a tab) is positioned within through-holes (not shown) on each end of large-chain link coupler  1006  and within through-hole  1030  at second end  1003  of body  1001 . As such, large-chain link coupler  1006  is movably (e.g., pivotably) coupled with body  1001  via pin  1011   b , such that large-chain link coupler  1006  pivots about pin  1011   b . Thus, in some aspects, large-chain link coupler  1006  and small-chain link coupler  1007  are movable (e.g., pivotable) relative to body  1001  independent of one another. Large-chain link coupler  1006  pivots about an axis (defined by pin  1011   a ) that extends perpendicular to the axis (defined by pin  1011   b ) about which small-chain link coupler  1007  pivots. As will be more evident from the figures described below, pins  1011   a  and  1011   b  or other portions of link coupler  1000  operate to engage with dual chain wheels to facilitate or cause large chains to engage with the large wildcat profile, small chains to engage with the small wildcat profile, or combinations thereof. 
     While link coupler  1000  is shown as including two link couplers, small and large, independently coupled with a body positioned therebetween, the link coupler disclosed herein is not limited to this particular arrangement and structure, and may include other structures capable of concurrently linking with both small and large chains, and of engaging with a chainwheel. 
     Link Coupler—Engagement Features 
     A dual chainwheel includes two chainwheel profiles (also referred to as wildcat profiles), including one configured (i.e., sized, shaped, and/or arranged) to engage with a relatively small, messenger chain and another configured to engage with a relatively larger, anchor chain. For example, a dual chainwheel, such as is shown in  FIGS. 2A-4C  (discussed in more detail below), may include an inner chainwheel profile configured to engage with a relatively small messenger chain and an outer chainwheel profile configured to engage with a relatively larger anchor chain. Link coupler  1000  includes one or more features that provide for engagement of link coupler  1000  with a dual chainwheel, including the size, shape, profile, surface features, and arrangement of one or more of the components of link coupler  1000 , such as the size, shape, profile, surface features, and arrangement of small-chain link coupler  1007 , large-chain link coupler  1006 , and body  1001 , and including the relative arrangement of these components. In some aspects, link coupler  1000 , or at least the body  1001  thereof, has the shape generally of a “dog-bone.” 
     Dual chainwheel engagement features of body  1001  include the relative arrangement of first end  1002  and second end  1003 . As shown, first end  1002  is arranged 180° relative to second end  1003 , such that through-hole  1020  extends perpendicular to through-hole  1030 . That is, an axis  1021  extending through and axially aligned with through-hole  1020  is perpendicular to an axis  1031  extending through and axially aligned with through-hole  1030 . This provides for the perpendicular arrangement of small-chain link coupler  1007  relative to large-chain link coupler  1006 . First end  1002  may have width  1041  that is wider than width  1042  of second end  1003  in the dimension of body  1001  defined from first side  1005   a  to second side  1005   b . First end  1002  may have height  1043  that is shorter than height  1044  of second end  1003  in the dimension of body  1001  defined from top  1004   a  to bottom  1004   b . Through-hole  1020  of first end  1002  may be sized to engaged with a relatively small messenger chain, and through-hole  1030  of second end  1003  may be sized to engaged with a relatively large anchor chain (i.e., through-hole  1020  may have a smaller diameter than through-hole  1030 ). Body  1001  may include one or more surface features, such as beveled edges  1051  on first end  1002 , second end  1003 , or combinations thereof. Between first end  1002  and second end  1003 , body  1001  includes mid-section  1053 , which is a narrow section of body  1001  relative to first end  1002  and second end  1003 . Thus, these features of body  1001 , including: (1) the perpendicular arrangement of small-chain link coupler  1007  relative to large-chain link coupler  1006 ; (2) the relative widths of first end  1002  and second end  1003 ; (3) the relative heights of first end  1002  and second end  1003 ; (4) the relative sizes and direction of extension of through-holes  1020  and  1030 ; (5) the surface profile of body  1001 , including beveled edges  1051 ; and (6) the narrow mid-section  1053 , separate or in combination, provide for selective engagement of body  1001 , small-chain link coupler  1007 , large-chain link coupler  1006 , and any chains attached thereto with a dual chainwheel, such that small-chain link coupler  1007  and any chain attached thereto engages with a small wildcat profile of the dual chainwheel and large-chain link coupler  1006  and any chain attached thereto engages with a large wildcat profile of the dual chainwheel. 
     Dual chainwheel engagement features of the small and large chain link couplers include the relative, perpendicular arrangement of small-chain link coupler  1007  and large-chain link coupler  1006 . As shown, small-chain link coupler  1007  is arranged 180° relative to large-chain link coupler  1006 , such that the coil of small-chain link coupler  1007  opens perpendicular to the opening of the coil of large-chain link coupler  1006 . Small-chain link coupler  1007  has width  1061  that is narrower than width  1062  of large-chain link coupler  1006  in the dimension corresponding with the dimension of body  1001  defined from first side  1005   a  to second side  1005   b . Small-chain link coupler  1007  has height  1063  that is greater than height  1064  of large-chain link coupler  1006  in the dimension corresponding with the dimension of body  1001  defined from top  1004   a  to bottom  1004   b . The coil of small-chain link coupler  1007  is sized to engaged with a relatively small messenger chain, and the coil of large-chain link coupler  1006  is sized to engaged with a relatively large anchor chain. Pin  1011   a  extends perpendicular to pin  1011   b , and pin  1011   b  extend beyond width  1062 , such that pins  1011   a  and  1011   b  are positioned to engage with surface features of the dual chainwheel, as described in more detail below, to facilitate transition between moving a small chain to moving a large chain. While pins are shown and described as forming the engagement feature that facilitates transition between moving a small chain to moving a large chain, the link coupler is not limited to this particular structure, and may include another structural engagement feature configured (position, sized, shaped, and/or arranged) to engage with the dual chain wheel in such a manner that small chains are positioned to engage with the small wildcat profile of the dual chain wheel and large chains are positioned to engage with the large wildcat profile of the dual chain wheel. Thus, these features of the small and large chain link couplers, including: (1) the perpendicular arrangement of small-chain link coupler  1007  and large-chain link coupler  1006 ; (2) the relative widths of small-chain link coupler  1007  and large-chain link coupler  1006 ; (3) the relative heights of small-chain link coupler  1007  and large-chain link coupler  1006 ; (4) the relative sizes of the coils of small-chain link coupler  1007  and large-chain link coupler  1006 ; and (5) the relative positioning and sizes of the pins  1011   a  and  1011   b , separate or in combination, provide for selective engagement of small-chain link coupler  1007  and large-chain link coupler  1006 , and any chains attached thereto, with a dual chainwheel, such that small-chain link coupler  1007  and any chain attached thereto engages with a small wildcat profile of the dual chainwheel and large-chain link coupler  1006  and any chain attached thereto engages with a large wildcat profile of the dual chainwheel. As such, small-chain link coupler  1007  engages with a portion of a dual chainwheel that is distinct from a portion of the dual chainwheel that engages with large-chain link coupler  1006 . 
     Assembly of Link Coupler with Small and Large Chains 
       FIGS. 1J-1M  depicts link coupler  1000  connected with small chain link  1110  and large chain link  1115 . As shown, large-chain link coupler  1006  and small-chain link  1007  are each in the form of a D-link. Large-chain link coupler  1006  is coupled with body  1001  via pin  1011   b  having pin head  1017   b . Pin  1011   b  is secured to large-chain link coupler  1006  and body  1001  via nut  1019   b . Similarly, small-chain coupler  1007  is coupled with body  1001  via pin  1011   a  having pin head  1017   a , and pin  1011   a  is secured to small-chain link coupler  1007  and body  1001  via nut  1019   a.    
     Assembly of Dual Chainwheel and Link Coupler 
     Certain aspects of the present disclosure include a dual chainwheel configured (i.e., sized, shaped and/or arranged) to engage with a relatively small chain, such as a messenger chain, and a relatively large chain, such as an anchor chain. The dual chainwheel is also configured to engage with the link coupler disclosed herein. Some aspects of the present disclosure include an assembly of a dual chainwheel and a link coupler. With reference to  FIGS. 2A-4C , an assembly of a dual chain wheel and a link coupler is depicted, in accordance with some aspects of the present disclosure, where a messenger chain and an anchor chain are sequentially shown being hauled-in. 
       FIGS. 2A-2C  depict assembly  2000 , including dual chainwheel  1108  engaged with messenger chain  1110  and link coupler  1000 . Dual chainwheel  1108  includes first chainwheel profile  1109   a , here shown as an outer chainwheel profile, and second chainwheel profile  1109   b , here shown as an inner chainwheel profile. First chainwheel profile  1109   a  is configured (i.e., sized, shaped and/or arranged) to receive, engage, and move a relatively larger chain size, in comparison to the chain size that second chainwheel profile  1109   b  is configured to receive, engage, and move. Second chainwheel profile  1109   b  includes a series of surface features, such as peaks, ledges, undulations, valleys, grooves, pockets, grooves, wheel pockets, and surface contours configured for engagement with a small chain and optionally link coupler. Inner pocket flat beds  1191  are configured (i.e., sized, shaped and/or arranged) to engage within coils of vertical links of messenger chain  1110 , and inner bottom grooves  1190  are configured (i.e., sized, shaped and/or arranged) to engage with horizontal links of messenger chain  1110 . As used herein, “vertical links” and “horizontal links” of a chain refer to adjacent links of a chain that are oriented 90 degrees or substantially 90 degrees relative to one another. As shown in  FIG. 2C , link  1116  of messenger chain  1110  is a vertical link and link  1117  of messenger chain  1110  is a horizontal link, and link  1118  of anchor chain  1115  is a vertical link and link  1119  of anchor chain  1115  is a horizontal link. In operation, inner bottom grooves  1190  engage with successive horizontal links  1117 , while chainwheel  1108  rotates to progressively haul-in or pay-out messenger chain  1110 , and inner pocket flat beds  1191  engage with successive vertical links  1116 . Small-chain link coupler  1007  is configured (i.e., sized, shaped and/or arranged) to fit and engage with second chainwheel profile  1109   b . As such, messenger chain  1110  is hauled-in or paid-out along a path defined by second chainwheel profile  1109   b.    
       FIGS. 3A-3C  depict assembly  2000 , including dual chainwheel  1108  in transition from engagement with messenger chain  1110  and link coupler  1000  to engagement with anchor chain  1115  and link coupler  1000 . First chainwheel profile  1109   a  has a width  1111   a  that is greater than the width  1111   b  (shown in  FIG. 2A ) of second chainwheel profile  1109   b . First chainwheel profile  1109   a  includes a series of surface features, such as peaks, ledges, undulations, valleys, grooves, pockets, grooves, wheel pockets, pits, and surface contours configured for engagement with a large chain and optionally link coupler. First chainwheel profile  1109   a  includes a series of peaks outer whelp tips  1194 , outer teeth  1195 , and outer link pocket flat beds  1198  that are configured (i.e., sized, shaped and/or arranged) to receive and mate with a portion of link coupler  1000  such that anchor chain  1115  engages with and is moved along first chainwheel profile  1109   a . Link coupler  1000  includes one or more features that facilitate this transition of engagement of chainwheel  1108 . Pin  1110   b  of link coupler  1000  is configured (i.e., sized, shaped and/or arranged) to engage within an outer link pocket flat beds  1198   a  of first chainwheel profile  1109   a , against one of the outer whelp tips  1194  of first chainwheel profile  1109   a . As such, large-chain link coupler  1006  is engaged with first chainwheel profile  1109   a , and, in at least some embodiments, does not engage with second chainwheel profile  1109   b . In operation, pin  1110   b  is engaged within an outer link pocket flat bed  1198 , and chainwheel  1108  rotates to progressively haul-in or pay-out anchor chain  1115 . 
     As shown in  FIGS. 4A-4C , as anchor chain  1115  is further hauled-in, messenger chain  1110 , and ultimately link coupler  1000 , become disengaged from chainwheel  1108 . Thus, pin  1110   b  and large wildcat profile surface features facilitate transition of engagement between second chainwheel profile  1109   b  and messenger chain  1110  to engagement between first chainwheel profile  1109   a  and anchor chain  1115 , and facilitates movement of anchor chain  1115  along a patch defined by first chainwheel profile  1109   a . As such, anchor chain  1115  is hauled-in or paid-out along a path defined by first chainwheel profile  1109   a.    
     While the link coupler is shown and described as including a pin to facilitate transition to engagement with the anchor chain, the link couplers disclosed herein are not limited this particular structure, and may include other structures capable of causing a dual chainwheel engaged therewith to transition from engagement with a messenger chain to engagement with an anchor chain. Further, while the chainwheel profiles disclosed herein are shown as including peaks and valleys to facilitate engagement and transition between the chainwheel profiles and the messenger chain, link coupler, and anchor chain, the chainwheel profiles disclosed herein are not limited this particular structure, and may include other structures capable of facilitating engagement and transition between the chainwheel profiles and the messenger chain, link coupler, and anchor chain. 
     Thus, link coupler  1000  facilitates the interconnection of two different sized chains, and facilitates the transition of engagement between a dual chainwheel and the two different sized chains. Link coupler  1000  may have a length and/or pitch that allows a smaller link driving wheel of a dual chainwheel (i.e., second chainwheel profile) to engage the link coupler  1000 . The pitch of the body  1001  may have dimensions sufficient to maintain engagement between second chainwheel profile  1109   b  and links of the small chain (i.e., messenger chain  1110 ), and to deliver the links of the larger chain (i.e., anchor chain  1115 ) to first chainwheel profile  1109   a  for engagement there-between. In some aspects, body  1001  is shaped, sized, and/or arranged to engage wheel pockets and/or wheel ledges of the dual chainwheel  1008  (i.e., inner bottom grooves  1190  and inner pocket flat beds  1191 ). 
     The link coupler  1000  disclosed herein may be coupled with many types of chain including, but not limited to, anchor chains and messenger chains. In some aspects, the link coupler  1000  connects with relatively heavy-duty chains, such as an anchor chain or haulage chain, including chains used in conjunction with chainwheels for transmitting tensional drives. Furthermore, the link coupler  1000  may be used with many types of chainwheels. In some aspects, the link coupler  1000  is used in conjunction with a dual chainwheel, as is disclosed in U.S. Provisional Application No. 61/555,350, filed on Nov. 3, 2011 (Expired), and U.S. patent application Ser. No. 13/669,310, filed on Nov. 5, 2012 (Abandoned), the disclosures of which are incorporated herein by reference in their entireties. In some aspects, the link coupler  1000  is used in conjunction with a dual chainwheel, as is disclosed in U.S. Pat. No. 9,127,747, issued on Sep. 5, 2015, the disclosure of which is incorporated herein by reference in its entirety. 
     Rotary Chain Jack Assembly 
       FIG. 5  is a reproduction of FIG. 1 from incorporated U.S. patent application Ser. No. 15/431,145, with the exceptions that: the reference numerals for the dual chainwheel and components thereof have been changed; the reference numerals for the link coupler and components thereof have been changed; and the references numerals for the offshore structure and top surface thereof have been changed. Otherwise, all reference numerals refer to the element shown and described in the description of FIG. 1 of incorporated U.S. patent application Ser. No. 15/431,145. 
       FIG. 5  depicts rotary chain jack assembly  5000 , including rotary chain jack  100 . Rotary chain jack  100  includes dual chainwheel  1108   a  engaged with link coupler  1000 , both of which are positioned on top surface  5002  of offshore structure  5001 . Top chain link  131  of anchor chain  130  is coupled with link coupler  1000  (also referred to as a shackle or back-to-back shackle). In the position of the mooring line, as shown in  FIG. 5 , link coupler  1000  is coupled with dual chainwheel  1108   a . As shown, pin  1011   b  is coupled with outer tip whelp  1194  of dual chainwheel  1108   a . Link coupler  1000  is also coupled to messenger chain  150 . 
     In assembly  5000 , dual chainwheel  1108   a  is coupled to frame  120 . Dual chainwheel  1108   a  includes axle  112  engaged within a through-hole (not shown) of frame  120 . Frame  120  is coupled to a portion of offshore structure  5001 , such as via bolting, welding, or any other such method well known to those of ordinary skill in the art. Offshore structure  5001  may be, for example and without limitation, an offshore floating platform, such as for offshore drilling and production of hydrocarbons or for construction, or a ship. In some embodiments, frame  120  retains dual chainwheel  1108   a  in a position that is raised above top surface  5002  of offshore structure  5001 , allowing dual chainwheel  1108   a  to rotate relative to frame  120  without contacting top surface  5002  of offshore structure  5001 . Offshore structure  5001  may include inboard hawse pipe  182  and outboard hawse pipe  180 . 
     Assembly  5000  includes jack cylinders  160 . At first end  161  of jack cylinders  160 , jack cylinders  160  are coupled, such as via bolting, to frame  120 . In other embodiments, first end  161  may be coupled to a portion of offshore structure  5001 . Second end  162  of jack cylinders  160  are coupled, such as via bolting, to crank arm  163 . Crank arm  163  is coupled with axle  112 , such as via pinning, press fit, or any other manner well known to those of ordinary skill in the art. In operation, actuation of jack cylinders  160  rotates crank arm  163 , rotation of crank arm  163  rotates axle  112 , rotation of axle  112  rotates dual chainwheel  1108   a , and rotation of dual chainwheel  1108   a  either deploys or hauls in chain anchor chain  130  depending upon the direction of rotation of dual chainwheel  1108   a.    
     Assembly  5000  includes stopper assembly  170 . Stopper assembly  170  is positioned on frame  120 , such that stopper assembly  170  selectively engages anchor chain  130  for gripping of anchor chain  130 , and selectively disengages from anchor chain  130  for allowing passage of anchor chain  130 , such as during deployment of hauling-in of anchor chain  130 . Stopper assembly  170  couples with frame  120  such that stopper assembly  170  is positioned to engage anchor chain  130  on an outboard side of dual chainwheel  1108   a , intermediate of dual chainwheel  1108   a  and an anchor (not shown) engaged with anchor chain  130 . 
     With reference to  FIGS. 6A and 6B , once messenger chain  150  is hauled-in, but still engaged with second chainwheel profile  1109   b , link coupler  1000  becomes engaged with outer tip whelp  1194  of first chainwheel profile  1109   a . After engagement of link coupler  1000  with outer tip whelp  1194 , further rotation of dual chainwheel  1108   a  results in the passing of chain  130  over first chainwheel profile  1109   a . Also shown in  FIGS. 6A and 6B  are inboard stopper assembly  172 , outboard stopper assembly  171 , chainwheel latch  191 , main latch  175   a , and auxiliary latches  176   a  and  176   b , the operation of each of which is describe in more detail in incorporated U.S. patent application Ser. No. 15/431,145. 
       FIGS. 7-11  are reproductions of FIGS. 1, 3, 10, 14, and 15 from incorporated U.S. patent application Ser. No. 15/603,068, respectively, with the exception that the reference numerals for the dual chainwheel and the link coupler have been modified. Otherwise, all reference numerals refer to the element shown and described in the description of the relevant figure in U.S. patent application Ser. No. 15/603,068. 
     With reference to  FIGS. 7-9 , assembly  6000  is depicted, including a rotary chain jack  100  on vessel  200 . Rotary chain jack  100  includes dual chainwheel  1108   b . Assembly  6000  includes link coupler  1000  engaged with anchor chain  15  (including vertical link  15   a  and horizontal link  15   b ), messenger chain  10 , and dual chainwheel  1108   b . In this manner, a continuous chain of two different chain sizes is formed by coupling link coupler  1000  with both messenger chain  10  and anchor chain  15 . In operation, pin  1011   b  of link coupler  1000  engages with teeth of dual chainwheel  1108   b , such as outer tip whelp  1194 , to facilitate transition from hauling-in messenger chain  10  to hauling-in anchor chain  15 . 
     Dual chainwheel  1108   b  is rotatably coupled to frame  1  via axel  14 . Frame  1  is coupled to a portion of offshore vessel  200 , such as the deck. Frame  1  may be coupled to offshore vessel  200  via welding and/or bolting, for example. Drive assemblies  32 , such as hydraulic or electric motors, are operatively coupled to gear assembly  6 , and gear assembly  6  is operatively coupled to dual chainwheel  1108   b . Drive assemblies  32  operate to drive gear assembly  6 , gear assembly  6  operates to drive dual chainwheel  1108   b , and dual chainwheel  1108   b  operates to pull-in or pay-out anchor chain  15  and/or messenger chain  10 , depending upon the direction of rotation of dual chainwheel  1108   b.    
     The rotary chain jack  100  includes rotatable chain stopper  20   a . Rotatable chain stopper  20   a  rotates about an axis in response to actuator  56 , such that actuator  56  initiates rotation of rotatable chain stopper  20   a . Actuator  56  may be, for example and without limitation, a linear actuator, such as hydraulic or pneumatic cylinder. The operation of actuator  56  and rotatable chain stopper  20   a  are described in more detail in incorporated U.S. patent application Ser. No. 15/603,068. 
       FIGS. 10 and 11  depict assembly  6000  during transition from hauling-in messenger chain  10  to hauling-in anchor chain  15 . During transition, link coupler  1000  engages outer tip whelp  1194  of dual chainwheel  1108   b . Outer tip whelp  1194  is shaped to receive link coupler  1000 . Also shown in  FIGS. 10 and 11  are latches  25 , adapted to selectively engage with links of messenger chain  10  and anchor chain  15 , and latch cylinder  39  configured to ratchetedly engage with dual chainwheel  1108   b , the operation of each of which is described in more detail in incorporated U.S. patent application Ser. No. 15/603,068. 
     One skilled in the art would understand that assemblies  2000 ,  5000 , and  6000 , as shown and described herein, are exemplary, and that the link coupler disclosed herein may be incorporated into assemblies of different structure and arrangement. 
     Method of Coupling and Moving Chains 
     Certain aspects of the preset disclosure include methods for coupling two lengths of different sized chain together and moving the two lengths of different sized chain together. The method may be implemented using the link couplers, dual chainwheels, and assemblies disclosed herein, such as are shown in  FIGS. 1A-11 . 
     The method includes providing a link coupler. The link coupler may be in accordance with those shown and described herein, including a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. 
     The method includes coupling a small chain with the small-chain link coupler. For example, the small-chain link coupler may be disengaged from the body by removing the pin. After disengagement from the body, the small-chain link coupler may be engaged through a coil of a chain link of a small chain, and then re-engaged with the body via the pin. 
     The method may include coupling a large chain with the large-chain link coupler. For example, the large-chain link coupler may be disengaged from the body by removing the pin. After disengagement from the body, the large-chain link coupler may be engaged through a coil of a chain link of a large chain, and then re-engaged with the body via the pin. The link coupler coupled with the small chain and the large chain forms a chain assembly. 
     The method may include engaging the chain assembly with a dual chainwheel. The dual chain wheel may include a small wildcat profile and a large wildcat profile. 
     The method may include hauling-in or paying-out the chain assembly, such as by pulling the messenger chain or releasing the messenger chain. 
     In some aspects, after coupling the small chain with the small-chain link coupler and before coupling the large chain with the large-chain link coupler, the method includes lowering the small chain with the link coupler coupled therewith into seawater, towards a seabed. In some such aspects, the large chain is an anchor chain coupled with an anchor at the seabed. Once lowered in proximity to the anchor chain, the method may include coupling the anchor chain with the large-chain link coupler, which may be performed underwater. 
     Hauling-in the chain assembly may include hauling-in the small chain along a path defined by the small wildcat profile until the link coupler engages the large wildcat profile. Engagement of the link coupler with the large wildcat profile results in the delivery of the large chain to the large wildcat profile. Hauling-in then includes hauling-in the large chain along a path defined by the large wildcat profile. 
     Paying-out the chain assembly may include paying-out the large chain along a path defined by the large wildcat profile until the link coupler engages the large wildcat profile. After engagement of the link coupler with the large wildcat profile, the paying-out includes continuing to pay-out the large chain along the path defined by the large wildcat profile until the link coupler disengages from the large wildcat profile. The disengagement of the link coupler from the large wildcat profile results in the delivery of the small chain to the small wildcat profile. The paying-out continues by paying-out the small chain along a path defined by the small wildcat profile. 
     Assembly Operation Sequence 
     The link couplers disclosed herein may be configured into customized sizes, lengths, and shapes, such that the link coupler is capable of smoothly transiting chain mooring lines around a chain wheel, including transitioning from transiting smaller chain link sections to larger chain link sections or transitioning from transiting larger chain link sections to smaller chain link sections. 
     The link couplers disclosed herein may be used in a variety of loading applications including, but not limited to: (1) applications where a chain wheel is driven by a chain link line, such as in fairlead assemblies; and (2) applications wherein a chain wheel is driving a chain link line, such as in a windlass pulling system. Some exemplary fairlead assemblies and loading applications with which the link couplers disclosed herein by be used include those shown and described in U.S. Pat. Nos. 5,845,893; 8,915,205; 9,126,659; and U.S. Patent Publication No. 2018/0086421, the entireties of each of which is incorporated herein by reference. 
     Chain Wheel—Driven Mode 
       FIG. 12  depicts a chain wheel suitable for use in driven mode. With reference to  FIG. 12 , certain features of chain wheel  1108   c  will be described; however, the function of such features, including the interaction of the features with the link coupler will be described in further detain with reference to  FIGS. 13A-31B . 
     Chain wheel  1108   c  includes outer interior wall  1199 , outer link pocket flat bed  1198 , outer pocket pit  1197 , outer link pocket trap end  1196 , outer teeth  1195 , outer whelp tip  1194 , and outer whelp base  1193 . Thus, the large wildcat profile of chain wheel  1108   c  is at least partially defined by outer interior wall  1199 , outer link pocket flat bed  1198 , outer pocket pit  1197 , outer link pocket trap end  1196 , outer teeth  1195 , outer whelp tip  1194 , and outer whelp base  1193 . 
     Chain wheel  1108   c  includes middle interior wall  1192 , inner interior wall  1187 , inner pocket flat bed  1191 , and inner bottom groove  1190 . Chain wheel  1108   c  also includes inner pocket trap end  1189 . Thus, the middle interior wall  1192 , inner interior wall  1187 , inner pocket flat bed  1191 , inner bottom groove  1190 , and inner pocket trap end  1189  at least partially define the small wildcat profile of chain wheel  1108   c.    
     Chain wheel  1108   c  may be operated in driven mode, and the link coupler may be used in any orientation, which allows for use of larger D-links interfacing with the chain wheel  1108   c  either perpendicular (horizontal link) to, or parallel (vertical link) with the chain wheel plane. As used herein, “perpendicular” and “parallel” are denoted with respect to the larger D-link plane relative to the orientation of the chain wheel plane.  FIGS. 13A and 13B  depict chain wheel  1108   c  in driven mode, engaged with small chain  1110  and large chain  1115 , which are coupled with link coupler  1000 . In  FIGS. 13A and 13B , large-chain link coupler  1006  is a large D-link oriented perpendicular to the plane within which the chain wheel  1108   c  rotates.  FIGS. 14A and 14B  depict chain wheel  1108   c  in driven mode, engaged with small chain  1110  and large chain  1115 , which are coupled with link coupler  1000 . In  FIGS. 14A and 14B , large-chain link coupler  1006  is a large D-link oriented parallel to the plane within which the chain wheel  1108   c  rotates. 
     Operation Sequence—Chain Wheel in Driven Mode with Perpendicular D-Link 
       FIGS. 15A-23B  illustrate the steps of interfacing between small chain  1110 , link coupler  1000 , large chain  1115 , and chain wheel  1108   c , with large-chain link coupler  1006  in the perpendicular orientation, and with engagement transitioning from engagement with small chain  1110  to engagement with large chain  1115 . 
     With reference to  FIGS. 15A and 15B , before link coupler  1000  enters into engagement with chain wheel  1108   c , small chain link  1110  seats on inner pocket flat bed  1191 , with small chain coupler  1007  clear of outer interior wall  1199 . 
     With reference to  FIGS. 16A and 16B , as chain wheel  1108   c  rotates, small chain  1110  continues to interface with inner pocket flat bed  1191 , while pin head  1017   b  (or nut  1019   b  or other portion of pin  1011   b ) of large chain coupler  1006  approaches towards outer whelp base  1193 . 
     With reference to  FIGS. 17A and 17B , pin head  1017   b  (or nut  1019   b  or another portion of pin  1011   b ) engages with outer whelp base  1193 , while small chain  1110  is still seated inner pocket flat bed  1191 . 
     With reference to  FIGS. 18A and 18B , the assembly stays in substantially the same configuration as in  FIGS. 17A and 17B  while the chain wheel  1108   c  continues to rotate. 
     With reference to  FIGS. 19A and 19B , pin head  1017   b  (or nut  1019   b  or another portion of pin  1011   b ) engages with outer whelp base  1193 , while small chain  1110  is departing from inner pocket flat bed  1191 , and large-chain link coupler  1006  is approaching towards outer link pocket flat bed  1198 . 
     With reference to  FIGS. 20A and 20B , large-chain link coupler  1006  engages outer link pocket flat bed  1198 , while pin head  1017   b  (or nut  1019   b  or another portion of pin  1011   b ) is still engaged with outer whelp base  1193 . 
     With reference to  FIGS. 21A and 21B , chain wheel  1108   c  rotates further, while large chain link  1115  approaches towards outer link pocket trap end  1196 . 
     With reference to  FIGS. 22A and 22B , large chain  1115  engages outer link pocket trap end  1196 , while large-chain link coupler  1006  is still engaged with outer link pocket flat bed  1198 . Also, pin head  1017   b  (or nut  1019   b  or another portion of pin  1011   b ) departs from engagement with outer whelp base  1193 . 
     With reference to  FIGS. 23A and 23B , large chain link  1115   a  fully seats on outer link pocket flat bed  1198 , while large-chain link coupler  1006  departs away from outer link pocket flat bed  1198 . In operation, the next large chain link  1115   b  approaches to the next outer link pocket flat bed  1198  of chain wheel  1108   c.    
     Operation Sequence—Chain Wheel in Driven Mode with Parallel D-Link 
       FIGS. 24A-31B  illustrate the steps of interfacing between small chain  1110 , link coupler  1000 , large chain  1115 , and chain wheel  1108   c , with large-chain link coupler  1006  in the parallel orientation, and with engagement transitioning from engagement with small chain  1110  to engagement with large chain  1115 . 
     With reference to  FIGS. 24A and 24B , as link coupler  1000  begins to enter chain wheel  1108   c , smaller chain link  1110  seats on inner pocket flat bed  1191 , and small-chain link coupler  1006  clears outer interior wall  1199 . 
     With reference to  FIGS. 25A and 25B , as chain wheel  1108   c  rotates, small chain link  1110  interfaces with inner pocket flat bed  1191 , and pin head  1017   a  (or nut  1019   a  or another portion of pin  1011   a ) approaches towards outer pocket pit  1197 . 
     With reference to  FIGS. 26A and 26B , pin head  1017   a  (or nut  1019   a  or another portion of pin  1011   a ) engages with outer pocket pit  1197 , while small chain link  1110  remains seated on inner pocket flat bed  1191 . 
     With reference to  FIGS. 27A and 27B , with pin head  1017   a  (or nut  1019   a  or another portion of pin  1011   a ) engaged with outer pocket pit  1197 , small chain link  1110  departs from inner pocket flat bed  1191 , and large chain links  1115  approach towards outer link pocket trap end  1196 . 
     With reference to  FIGS. 28A and 28B , large chain link  1115  engages outer link pocket trap end  1196 , while pin head  1017   a  (or nut  1019   a  or another portion of pin  1011   a ) is engaged with outer pocket pit  1197 . 
     With reference to  FIGS. 29A and 29B , while large chain link  1115  interfaces with outer link pocket trap end  1196 , pin head  1017   a  (or nut  1019   a  or another portion of pin  1011   a ) depart away from pocket pit  1197  and larger chain link  1115  approaches towards outer link pocket flat bed  1198 . 
     With reference to  FIGS. 30A and 30B , large chain link  1115  engages with outer link pocket flat bed  1198 . 
     With reference to  FIGS. 31A and 31B , the assembly of chain wheel  1108   c , small chain  1110 , large chain  1115 , and link coupler  1000  is in the same continuation of in  FIGS. 30A and 30B , with chain wheel  1108   c  further rotated, and link coupler  1000  exiting engaging with chain wheel  1108   c.    
     In operation, within driven mode, loads are transferred (e.g., always or substantially always transferred) from chain links ( 1110  and  1115 ) to chain wheel  1108   c . In the perpendicular orientation of the driven mode, as shown in  FIGS. 15A-23B , the sequence of interfacing features is essentially as follows: (1) the small chain links  1110  interfaces with the inner pocket flat bed  1191 ; (2) the pin head  1017   b  (or nut  1019   b  or another portion of pin  1011   b ) interfaces with the outer whelp base  1193 ; (3) the large-chain link coupler  1006  interfaces with the outer link pocket flat bed  1198 ; (4) a large chain link  1115  interfaces with the outer link pocket trap end  1196 ; and (5) the large chain link  1115  interfaces with the outer link pocket flat bed  1198 . In the parallel orientation of the driven mode, as shown in  FIGS. 24A-31B , the sequence of interfacing features is essentially as follows: (1) the small chain links  1110  interfaces with the inner pocket flat bed  1191 ; (2) the pin head  1017   a  (or nut  1019   a  or another portion of pin  1011   a ) interfaces with the outer pocket pit  1197 ; (3) a large chain link  1115  interfaces with the outer link pocket trap end  1196 ; (4) the large chain link  1115  interfaces with the outer link pocket trap end  1196 ; and (5) the large chain link  1115  interfaces with the outer link pocket flat bed  1198 . 
     Chain Wheel—Driving Mode 
       FIG. 32  depicts a chain wheel in driving mode. With reference to  FIG. 32 , certain features of chain wheel  1108   d  will be described; however, the function of such features, including the interaction of the features with the link coupler will be described in further detain with reference to  FIGS. 33A-51B . 
     Chain wheel  1108   d  includes outer interior wall  1199 , outer link pocket flat bed  1198 , outer pocket pit  1197 , outer link pocket trap end  1196 , outer teeth  1195 , outer whelp tip  1194 , and outer whelp base  1193 . Thus, the large wildcat profile of chain wheel  1108   d  is at least partially defined by outer interior wall  1199 , outer link pocket flat bed  1198 , outer pocket pit  1197 , outer link pocket trap end  1196 , outer teeth  1195 , outer whelp tip  1194 , and outer whelp base  1193 . 
     Chain wheel  1108   d  includes middle interior wall  1192 , inner interior wall  1187 , inner pocket flat bed  1191 , and inner bottom groove  1190 . Chain wheel  1108   d  also includes inner pocket trap end  1189 . Thus, the middle interior wall  1192 , inner interior wall  1187 , inner pocket flat bed  1191 , inner bottom groove  1190 , and inner pocket trap end  1189  at least partially define the small wildcat profile of chain wheel  1108   d.    
     Chain wheel  1108   d  may be operated in driven mode, and the link coupler may be used in any orientation, which allows for use of larger D-links interfacing with the chain wheel  1108   d  either perpendicular (horizontal link) to, or parallel (vertical link) with the chain wheel plane. As used herein, “perpendicular” and “parallel” are denoted with respect to the larger D-link plane relative to the orientation of the chain wheel plane.  FIGS. 13A and 13B  depict chain wheel  1108   d  in driven mode, engaged with small chain  1110  and large chain  1115 , which are coupled with link coupler  1000 . In  FIGS. 13A and 13B , large-chain link coupler  1006  is a large D-link oriented perpendicular to the plane within which the chain wheel  1108   d  rotates.  FIGS. 14A and 14B  depict chain wheel  1108   d  in driven mode, engaged with small chain  1110  and large chain  1115 , which are coupled with link coupler  1000 . In  FIGS. 14A and 14B , large-chain link coupler  1006  is a large D-link oriented parallel to the plane within which the chain wheel  1108   d  rotates. 
     Operation Sequence—Chain Wheel in Driving Mode 
     Chain wheel  1108   d , when operating in driving mode, works (or only works) with perpendicular interfacing, with the higher, outer whelp tip  1194  on the chain wheel  1108   d , which are reinforced to accommodate larger torsional loads. The raised outer whelp tips  1194  may be integrated into the chain wheel  1108   d  casting, or may be standalone parts that are assembled onto the chain wheel  1108   c  (as is shown in  FIG. 32 ). The chain line wrap angle of the chain wheel  1108   d  may be greater or equal to 135° in order to prevent chain links from “jumping” off from the chain wheel  1108   d . In operation, within the driving mode, loads are transferred (e.g., always or substantially always transferred) from the chain wheel  1108   d  to chain links ( 1110  and  1115 ). 
     The interfacing sequences of the chain wheel  1108   d  with small chain  1110 , link coupler  1000  and large chain  1115  may be the same as described with reference to the chain wheel  1108   c  operated in driven mode and with a perpendicular orientation (i.e., the sequence shown and described with reference to  FIGS. 15A-23B ). As such, the details of the interfacing will not be repeated. Link coupler  1000  orientation is illustrated in  FIGS. 33A and 33B , and the sequences of transition for the link coupler around the chain wheel  1108   d  are illustrated, sequentially, in  FIGS. 34A-51B . Briefly, in the driving mode, as shown in  FIGS. 33A-51B , the sequence of interfacing features is essentially as follows: (1) the small chain links  1110  interfaces with the inner pocket flat bed  1191 ; (2) the pin head  1017   b  (or nut  1019   b  or another portion of pin  1011   b ) interfaces with the outer whelp base  1193 ; (3) the large-chain link coupler  1006  interfaces with the outer link pocket flat bed  1198 ; (4) a large chain link  1115  interfaces with the outer link pocket trap end  1196 ; and (5) the large chain link  1115  interfaces with the outer link pocket flat bed  1198 . 
     Although the present embodiments and advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.