Abstract:
A chain repairing tool, which includes a tool body and a PBR block, which is configured for pressing side plates of chain links, for breaking chain links and for riveting chain links as the PBR block is variously oriented within the tool body of the chain repairing tool. Also, a chain repairing tool, having a tool body, a body bolt, which is threadably received by the tool body, and a breaking pin where the body bolt includes a tapered passage, which guides the breaking pin. Also, the breaking pin includes a domed head. Also, a PBR block, which is configured for pressing side plates of chain links, for breaking chain links and for riveting chain links as said PBR block is variously oriented, in conjunction with a chain repairing tool.

Description:
[0001]    The following is a non-provisional patent application which claims priority to provisional application 61/228,739 filed Jul. 27, 2009 to the same inventor. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates generally to metal working tools and more particularly to accessories for attaching and detaching chain links for bicycle and motorcycle chain applications. 
       BACKGROUND ART 
       [0003]    Chains are typically used in both bicycles and motorcycles as a means of transferring the rotary motion of the riders pedaling action or the motorcycle&#39;s motor to the rear wheel. The chain is especially useful at transferring this rotary motion to a variety of gears by use of a gear shifter. The nature of the chain, having a number of links that can pivot with respect to each other, allows the chain to thread between gears in a very flexible manner. 
         [0004]    Motorcycle and bicycle chains are generally configured with a number of link pairs, which are connected to each other by side plates. The link pair has two link pair members. A first link pair member of a first link pair is connected to a first end of a side plate. The second end of the side plate is then also connected to a first link pair member of a second link pair. These connections are made by chain pins, which are press-fit into the link pair members and side plate. 
         [0005]    The chains may be supplied in certain standardized lengths, which may be too long or two short for the exact cycle to which it is to be fitted. In addition, links of chains may become damaged by being bent, chipped, or otherwise deformed. It may be necessary to replace these links in order that the chain is not to fail or present a safety hazard. In either case, the chain may be “broken” by removing the chain pin that joins the links. When the link is broken at both ends, the link can be removed entirely and the neighboring links reattached, or a replacement link may replace the damaged one, and the chain pins then replaced to reconnect the chain. 
         [0006]    The chain can similarly be shortened by removing links or lengthened by adding links and then replacing the connecting chain pins. It is sometimes the practice to include one special link called a “master link” on which breaking or rejoining is commonly performed. This master link is sometimes different in shape or color than the rest of the links and may employ rivets to permanently lock the chain pins of the master link in place. 
         [0007]    Before the 1970&#39;s, most all chains came with a clip type master link. This master link could be removed simply with a pair of pliers by removing the safety clip. The only time it became necessary to break a chain was to shorten a length of chain to be installed. Rivet style master links were developed in the early 1970&#39;s because the more powerful motorcycles were having issues with breaking chains during hard acceleration. Shortly after, in the late 1970&#39;s O ring chains were introduced with press on rivet master links to increase durability by sealing the chain from water and debris. Thus the chain riveter was developed for use with these types of chains. 
         [0008]    Most of the current chains use either rivet “hollow nose master links” or “quad stake master links”. In the motorcycle world, hollow nose master links are much more common than the quad stake but it is generally accepted that the quad stake is a more secure method. 
         [0009]      FIG. 1  shows a drawing of a chain  1 , with its various parts and elements. A chain  1  includes link pairs  2 , which have a pair of link pair members  3 . The links  2  are joined by side plates  4  and possibly by master links  10 , which can be thought of as a specialized type of side plate  4 , which have a first end  7  and a second end  8 . The link pairs  2  shown include a first link pair member  5 , which for this discussion will be the link pair member on the right, and a second link pair member  6 , which for this discussion will be the link pair member on the left. Thus the first link pair member  5  of a first link pair  2  is connected to the first end  7  of side plate  4 , and the second end  8  of side plate  4  connects to the second link pair member  6  of a second link pair  2 . Connections between the link pair members and the side plates are made by chain pins  9 , which extend through the side plates  4  through the link pair members  2  and finally through a lower side plate  4 . 
         [0010]    A master link  10  is produced by taking a side link  4  which has two chain pins  9  which are press-fit into holes in the side plate  4 . A master link  10  is shown in  FIG. 2 , including chain pins configured as rivets  11 . The top side plate  4  has been pressed onto the rivets  11 , and then the tips  12  of the rivets  11  have been spread to prevent removal. It may be possible to later press the rivets out of the master link  10  and thus break the chain  1 , although rivets  11  are generally used to make a more permanent connection. These rivets may be of the hollow nose master link or quad stake master link types and a different type of rivet head tip is generally used for the two different types. A hollow nose rivet  13  is shown in  FIG. 2 . 
         [0011]    There are several reasons why a user may want to break a chain and then rivet it. These include: 
         [0012]    Gearing change. When installing a larger or smaller sprocket to change the final drive it is often necessary to add or remove a link or two so that the wheel can be kept within the allowable wheel adjustment. 
         [0013]    Replacement. New style O ring or press on link chains may not come apart unless the chain is physically cut. A chain breaker is required to remove the old master link and install the new one. 
         [0014]    Engine removal. It is not possible on most motorcycles to remove the front sprocket because of the close clearance between the frame and sprocket without first breaking and removing the chain. After the chain is removed it is possible to remove and replace the front sprocket known as the “counter shaft sprocket”. 
         [0015]    Chain repair tools have existed for years. One such repair tool is manufactured by Motion Pro, Inc. An example of this repair tool with instructional pages on its use is found at: 
         [0016]    http://www.motionpro.com/tech/articles/chain_breaker_and_riveting tool/ 
         [0017]    Images from this instructional page are included in this discussion, which detail the use of the prior repair tool, and which are included in  FIGS. 3-8 . The included instructions aid in the general understanding of the use of this type of tool. 
         [0018]    Referring now to  FIGS. 3-4 , a chain repair tool  20  is shown in a cut-away view in the process of breaking a chain  1 . The repair tool  20  includes a body  22 , an body bolt  24 , having a head  26 , a drive bolt  28 , having a drive bolt handle  30 , a breaking pin  32  and a main handle  34 . A spring  36  is provided which fits between the breaking pin  32  and the interior of the body bolt  24 . A hole  40  is also provided to allow the chain pin  9  to pass out of the repair tool  20   
         [0019]    The repair tool  20  is assembled by threading the body bolt  24  into the body  22 . The breaking pin  32  is inserted into the spring  36  and both are dropped into the body bolt  24  with the spring  36  under the tip head  38 . The drive bolt  28  is threaded into the body bolt  24  above the breaking pin  32 . 
         [0020]    The chain repair tool  20  is placed over the chain  1  as shown in  FIG. 4 . The breaking pin  32  must be withdrawn at least 2 mm into the body bolt  24  to clear the end of the chain pin  9 . One end of the chain pin  9  will be held in position by the end of the body bolt  24 , while the other end is held in position by the hole  40  of the tool body  22 . 
         [0021]    The body bolt  24  is tightened securely against the side plate  4  of the chain  1 . The drive bolt  28  is tightened by the drive bolt handle  30  or a 14 mm wrench until the chain pin  9  is pushed completely out and through the hole  40  in the tool body  22 . The chain  1  has then been broken. 
         [0022]    If side plates  4  are to be replaced, and pressed into place, the repair tool  20  must be reconfigured for pressing. The repair tool  20  is re-assembled as shown in  FIG. 5  for pressing the side plates  4 . The body bolt  24  will be threaded into the body  22 , with the breaking pin  32 , spring  36  and drive bolt  28  removed. Two press plates  42  are provided. One press plate  44  with the holes will be inserted into the body bolt  24 , and another press plate  46  with a groove will be placed in the hole  40  in the tool body  22 . 
         [0023]    The new chain  1  with the master link  10 , side plate  4  and o-rings (if applicable) is assembled. The assembled master link  10  is positioned in the repair tool  20  as shown in  FIG. 6 . The side plate  4  with the chain pins  9  will be placed against the grooved press plate  46 , and the side plate with the holes  4  will be placed against the press plate with the holes  44 . 
         [0024]    The body bolt  24  is lightly hand-tightened using a 14 mm wrench  15  until the press plates  44 ,  46  touch the master link side plates  4 . The master link chain pins are checked for proper alignment with the groove and holes in the press plates  44 ,  46  before final tightening. The body bolt  24  is then tightened until the chain pins  9  (not visible) protrude past the face of the side plate  4 . 
         [0025]    If a link is to be riveted in place, the repair tool  20  is again reconfigured, as shown in  FIGS. 7-8 , which show the repair tool  20  configured for riveting hollow-nosed master link pins. The body bolt  24  is threaded into the body  22 . The rivet tip  48  (not visible in this figure) is inserted into the body bolt  24 . The drive bolt  28  is threaded into the body bolt  24 . An anvil  50  is placed in the hole  40  in the tool body  22 . 
         [0026]    The new side plates  4  of the master link  10  should already be pressed as described above so that the chain pin  9  (not visible) protrudes past the face of the side plate  4  of the master link  10 . The repair tool  20  is positioned over the rivet  11  to be riveted, with the hollow end  52  (not visible) of the chain pin  9  facing the rivet tip  48 , and the solid end  54  facing the anvil  50 . 
         [0027]    The body bolt  24  is tightened securely against the side plate  4  of the chain  1 . Then using a 14 mm wrench, the drive bolt  28  is tightened very tightly until the rivet tip  48  spreads the hollow nose  52  of the rivet  11 . The hollow end  52  of the rivet  11  should be flared over the side plate  4  just enough so that the side plate  4  is solidly held in place. This procedure is repeated on the other rivet  11 .  FIG. 2  shows a master link  10  with properly flared hollow-nosed rivets  13 . 
         [0028]    As is apparent from the previous discussion, the prior repair tool  20  requires a number of parts, some of which are not used at any one time, and therefore may be easily misplaced or lost unless they are kept together in a carrying case or tool kit. Additionally, it may be unclear at any one time whether the tool is configured for “breaking”, “pressing” or “riveting”, and separate attachments may be required for each of these operations. Re-configuring the tool  20  for the various operations may be confusing for users who have limited familiarity with the chain repair. 
         [0029]    Therefore, there is a need for a chain repairing tool for attaching, detaching and riveting chain links that combines features of several individual tools into a single convenient unit, which uses fewer parts, which is more easily converted from one configuration to another, and which is clear for which of the various operations of breaking, pressing and riveting the tool is configured 
       DISCLOSURE OF INVENTION 
       [0030]    Briefly, one preferred embodiment of the present invention is a chain repairing tool, which includes a tool body and a PBR block, which is configured for pressing side plates of chain links, for breaking chain links and for riveting chain links as the PBR block is variously oriented within the tool body of the chain repairing tool. 
         [0031]    Another embodiment is a chain repairing tool, having a tool body, a body bolt which is threadably received by the tool body and a drive bolt which is threadably engaged within said body bolt, where the body bolt includes a tapered passage which guides the breaking pin. 
         [0032]    Another embodiment is a chain repairing tool, having a tool body, a body bolt which is threadably engaged by the tool body, a drive bolt which is threadably engaged within the body bolt and a breaking pin which is seated within the body bolt. The breaking pin is engaged with the drive bolt such that as the drive bolt is advanced within the body bolt, the breaking pin is advanced. The breaking pin includes a domed head. 
         [0033]    Also disclosed is a PBR block, which is configured for pressing side plates of chain links, for breaking chain links and for riveting chain links as the PBR block is variously oriented, in conjunction with a chain repairing tool having a body bolt. 
         [0034]    An advantage of the present invention is that it includes a PBR block, which takes the place of numerous prior accessories. 
         [0035]    Another advantage of the present invention is that it includes a breaking pin, which has been modified to bind less within the repair tool. 
         [0036]    A further advantage of the present invention is that it includes a body bolt, which includes a tapering passage which helps with the proper alignment of the breaking pin. 
         [0037]    And another advantage of the present invention is that it includes an adaptor to install rivet tips for riveting operations. 
         [0038]    Yet another advantage of the present invention is that it includes a dual-sided rivet tip, which includes rivet tips for both hollow nose rivets and quad stake rivets. 
         [0039]    A further advantage of the present invention is that it is configured so that the adaptor and rivet tip are attached to the handle of the tool when not being used. 
         [0040]    A yet further advantage of the present invention is that it provides a block which is reversible and turns to aid in operations of Pressing, Breaking and Riveting all in the same block. 
         [0041]    Still another advantage of the present invention is that it contains fewer parts that can be lost and does not require a carrying case for accessories. 
         [0042]    Another advantage of the present invention is that it contains fewer parts, and is less costly to manufacture. 
         [0043]    Another advantage is that the design of the tool allows the user to perform multiple operations without the need to disassemble the tool. 
         [0044]    These and other objects and advantages of the present invention will become clear to those skilled in the art in view of the description of the best presently known mode of carrying out the invention and the industrial applicability of the preferred embodiment as described herein and as illustrated in the several figures of the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0045]    The purposes and advantages of the present invention will be apparent from the following detailed description in conjunction with the appended drawings in which: 
           [0046]      FIGS. 1-2  show views of a chain and a master link; 
           [0047]      FIG. 3  shows a cross-sectional view of a chain repair tool of the prior art; 
           [0048]      FIG. 4  shows a view of a chain repair tool of the prior art breaking a chain; 
           [0049]      FIGS. 5-6  show views of a chain repair tool of the prior art pressing a link; 
           [0050]      FIGS. 7-8  show views of a chain repair tool of the prior art riveting a link; 
           [0051]      FIG. 9  shows a cross-sectional view of the chain repair tool of the present invention; 
           [0052]      FIGS. 10-11  show isometric top and bottom views of the PBR block of the present invention; 
           [0053]      FIGS. 12-14  show isometric top and bottom views of the chain repair tool of the present invention in a pressing operation on the links of a chain; 
           [0054]      FIGS. 15-16  show isometric top and bottom views of the chain repair tool of the present invention in a breaking operation on the links of a chain; and 
           [0055]      FIGS. 17 ,  18 A-D and  19  show isometric top and bottom views of the chain repair tool of the present invention in a riveting operation on the links of a chain, with detail views of the adapter and rivet tips of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0056]    The present invention is an improved repair tool for bicycle and motorcycle chains, which will be referred to by the reference number  100 , and thus shall be referred to as chain repair tool  100 . A preferred embodiment of the chain repair tool  100  is illustrated in  FIGS. 9-19 , and these figures will be referred to generally. Where the elements of the improved chain repair tool  100  are similar to those of the previous repair tool  20  discussed in the Background Art section, similar reference numbers will be used. 
         [0057]    Referring specifically now to  FIG. 9 , the chain repair tool  100  is shown in a cut-away view in the process of breaking a chain  1 . The repair tool  100  includes a body  22 , a modified body bolt  103 , having a head  26 , a drive bolt  28 , and a modified breaking pin  105  having a domed head  182 . The interior of the body bolt  103  includes a tapered passage  107 , which helps to guide the breaking pin  105 . There is also a modified main handle  101  having an attachment point for an adapter  170  for a rivet tip  172 , which is preferably a dual sided rivet tip  174 , having a hollow nose rivet tip  176  and a quad stake rivet tip  178 . A hole  40  is also provided to allow the chain pin  9  or rivet to pass out of the repair tool  100   
         [0058]    One novel feature of the present invention  100  is the PBR block  102 . As discussed above, the prior repair tool  20  requires a number of parts, some of which are not used at any one time, and therefore may be easily displaced or lost unless they are kept together in a carrying case or tool kit. Additionally, it may be unclear at any one time whether the tool is configured for “breaking”, “pressing” or “riveting”, and separate attachments may be required for each of these operations. Re-configuring the prior tool  20  for the various operations may be confusing for some users. Therefore, there is a need for a chain repairing tool for attaching, detaching and riveting chain links that combines features of several individual tools into a single convenient unit, which uses fewer parts, which is more easily converted from one configuration to another, and which is clear for which of the various operations of breaking, pressing and riveting the tool is configured. 
         [0059]    The PBR block  102  addresses many of these concerns by providing an accessory which allows all three of the operations of Pressing (P), Breaking (B) and Riveting (R) to be performed with minimal re-configuration of the tool  100 . Additionally, the tool  100  and the block  102  are clearly marked to remind the user of the current configuration. 
         [0060]      FIGS. 10 and 11  show detail isometric views of the PBR block  102  and the six sides of the block, which have been configured for multiple usage. The block  102  has three basic orientations corresponding to the operations of Pressing (P), Breaking (B) and Riveting (R), which can now be accomplished by turning the block  102  until the proper letter notation is in upright position on the side of the block  102  and aligned with the corresponding mark on the body  22 . 
         [0061]    The block  102  of course has six sides, and the side with the lettering shall be referred to as the labeled face  104 , which includes the indicia  106  of “P”, “B” and “R”. The opposite side of the block  102  shall be referred to as the rear face  108 . When the block is positioned so the “P” marking  110  is upright in the lower right-hand corner as seen from the front of the labeled face  104 , the face which is on top shall be referred to as the P top face  112 , and the face on the bottom shall be referred to as the P bottom face  114 . This shall be referred to as the P orientation  116 . 
         [0062]    When the block  102  is turned upside down from the P orientation, as when used in breaking operations, the “B” marking  120  will be upright and located in the upper right hand corner as seen from the front of the labeled side  104 . The face which is on top during this operation shall be referred to as the B top face  122 , and the face on the bottom shall be referred to as the B bottom face  124 . This will be referred to as the B orientation  126 . 
         [0063]    It will be appreciated that physically, the P top face  112  and the B bottom face  124  refer to the same side of the block  102 , and likewise the P bottom face  114  and the B top face  122  refer to the same side of the block  102 . However, as these P and B faces function differently, they shall be referred to differently, in the manner indicated. 
         [0064]    When the block  102  is turned sideways, as when used in riveting operations, the “R” marking  130  will be upright and located in the lower right hand corner as seen from the front of the labeled side  104 . The face which is then on top shall be referred to as the R top face  132 , and the face on the bottom shall be referred to as the R bottom face  134 . This will be referred to as the R orientation  136 , which will be discussed below. 
         [0065]      FIGS. 12-14  show the repair tool  100  with the block  102  in P orientation  116  for pressing operations. It will be noted that there is a labeled side  140  of the tool body  22 , including body indicia  142 . These include the marking “Press”  144 , “Break”  146  and “Rivet”  148 . When the block  102  is in P orientation  116 , the block  102  is attached to the lower end of body bolt  103 . The drive bolt  28  is not used in this operation, and is backed out enough that the break pin (not shown) is also withdrawn up into the body bolt  103 . The block  102  is now aligned so that the P marking  110  is aligned with the Press marking  144 , which serves as a reminder that the repair tool  100  is configured for Pressing operations. The lower jaw  156  is shown, having a groove  157 , which helps to align the chain link for the operation. 
         [0066]      FIG. 13  shows the P bottom face  114  of the block  102  in which the cut-outs  154  can be seen, which allow space for the rivet ends to protrude. 
         [0067]    Referring again to  FIGS. 10 and 11 , P top face  112  has cavity  150  into which the end of body bolt  103  seats. P bottom face  114  has through hole  152  and side cut-outs  154 . The cut-outs  154  allow pins to protrude through a side plate  4  for riveting or installation of a clip. 
         [0068]    Referring now particularly to  FIG. 14 , in operation, the chain  1  seats on the lower jaw  156  of the repair tool  100 . The master link  10  is positioned on the lower jaw  156 , and the two link pairs  2  are mounted onto the rivets  11  of the master link  10 . The side plate  4  is then placed onto the two link pairs  2 , with the ends of the rivets  11  engaged in holes in the side plate  4 . The body bolt  103  is then tightened until the block  102  engages the side plate  4 , and then is further turned by a wrench to press the side plate  4  down onto the rivets  11  until they protrude from the side plate  4  into the cut-outs  154  of the P bottom face  114  (see  FIG. 13 ). The pressing operation is then completed and the chain  1  is removed from the repair tool  100 . 
         [0069]      FIGS. 15-16  show the repair tool  100  with the block  102  in B orientation  126  for breaking operations. When the block  102  is in B orientation  126 , the block  102  is seated on the lower jaw  156 . The drive bolt  28  is used in this operation, and the breaking pin  105  protrudes from the body bolt  103 . The block  102  is now aligned so that the B marking  120  is aligned with the Break marking  146 , which serves as a reminder that the repair tool  100  is configured for Breaking operations. 
         [0070]    Referring again to  FIGS. 10 and 11 ,  FIG. 11  shows B orientation  126 , as seen from the rear face  108 . B top face  122  has a through hole  152  into which the end of the breaking pin  105  extends, and through which the chain pin  9  is ejected out through the hole  40  in the lower jaw  156  of the repair tool  100 . Side cut-outs  154  are not used in the breaking operation. B left side face  128  corresponds to the R bottom face  134 , and includes location detents  158 , which help to maintain the block  102  in proper position on the lower jaw  156 . B bottom face  124  has cavity  150  with the continuation of through hole  152 . 
         [0071]    Referring particularly now to  FIG. 16 , in operation, the chain  1  seats on the block  102 . The master link  10  is positioned so that one of the chain pins  9  or rivets  11  is positioned under the breaking pin  105  (see  FIG. 15 ) and over the through hole  152  (see  FIG. 11 ). The body bolt  103  is then tightened until the chain  1  is held snugly. The drive bolt  28  is then turned by a wrench to drive the breaking pin  105  to press the chain pin  9  or rivet  11  until it protrudes from the bottom side plate  4  into the through hole  152  of the repair tool  100  and out through the bottom hole  40  of the lower jaw  156 . The breaking operation is then completed and the chain  1  is removed from the repair tool  100  in separate pieces. 
         [0072]      FIGS. 17-19  show the repair tool  100  with the block  102  in R orientation  136  for riveting operations. When the block  102  is in R orientation  136 , the block  102  is seated in the lower jaw  156 . The drive bolt  28  is not used in this operation, and is again backed out enough that the break pin (not shown) is also withdrawn up into the body bolt  103 . The block  102  is now aligned so that the R marking  130  is aligned with the Rivet marking  148 , which serves as a reminder that the repair tool  100  is configured for Riveting operations. 
         [0073]      FIGS. 18A-D  show an adapter  170  is fitted onto the body bolt  103 , preferably by means of magnetic attachment, and a rivet tip  172 , which is preferably a dual sided rivet tip  174 , is also magnetically attached to the adapter  170 . The dual sided rivet tip  174  is preferably reversible, so that if it turned in a first orientation, the rivet tip  172  is configured to engage hollow nose rivets, and is thus a hollow nose rivet tip  176 , and if reversed, it is configured to engage quad stake rivets, and is thus a quad stake rivet tip  178 . When not being used for riveting operations, the adapter  170  and dual sided rivet tip  174  attach to the end of the main handle  101  and thus do not require a special carrying case 
         [0074]    Referring again to  FIGS. 10 and 11 , R top face  132  has hole  160  into which the end of the rivet  11  seats. R top face  132  also has side cut-outs  162  into which ends of neighboring rivets  11  can fit. R left sided face  138  (which is also P bottom face  114 ) also has location detents  164 , which help maintain the block  102  in proper position. 
         [0075]    Referring now particularly to  FIG. 19 , when the repair tool  100  is configured for riveting the block  102  acts as an anvil upon which the master link  10  is seated. The side plate  4  has been previously pressed onto the rivets  11 . The body bolt  103  is then tightened until the rivet tip  172  engages the head of the rivet  11 , and then is further turned by a wrench to press the rivet tip  172  to spread the head of the rivet  11 , and thus prevent its removal. A hollow nose rivet tip  176  has a dome-shaped tip, which engages the hollow cylinder of the hollow nose rivet, and forces the material to deform. A quad stake rivet tip  178  has a pyramidal cavity which engages the solid end of the quad stake rivet, and “swedges” the tip by deforming it into a four sided shape which also spreads the head of the rivet so it cannot be easily removed. The riveting operation is then completed and the chain  1  is removed from the repair tool  100 . 
         [0076]    It is noted that the basic principal and features of the present chain repair tool  100  work for both motorcycle and bicycle chains. It will be apparent to one skilled in the art that a repair tool of larger or smaller size can easily be designed using the inventive features of the present invention. 
         [0077]    There are many advantages to the present invention  100 . As discussed above, the repair tool  100  additionally preferably includes a modified breaking pin  105  which includes a domed upper end  182 , which more easily engages the lower end of the drive bolt  28  as it advances. This helps the breaking pin  105  stay aligned in the body bolt  103  while the drive bolt  28  is inserted. A common problem with many chain breakers is misalignment of the breaking pin. When the breaking pin is misaligned it can bind up in the body bolt and bend or break. 
         [0078]    The present body bolt  103  incorporates a tapered passage  107  as shown previously in  FIG. 9 . In prior repair tools, the pin can get bound up on the internal lip of the body bolt and break the tool. This design makes the repair tool  100  easier to use and reduces the chance of damage to the repair tool  100 . 
         [0079]    One of the motivations of present invention was to include fewer parts. Most chain breakers require several extra pieces that must be stored separately to accomplish the complete job of breaking (removing) the old chain, and installing a new one. With prior chain breaker/riveters, to complete the job of replacing the chain requires installing and removing various specialized pieces into the tool, such as rivet plates, press plates . . . etc. One advantage of the present invention is that all of those features are incorporated into the PBR block  102 . This allows the user to quickly change from breaking the chain to pressing the new link on and then riveting with less parts and less time spent swapping components. It also means less separate pieces that can get lost or need to be stored. This all results in reduced manufacturing costs. 
         [0080]    Another motivation was to make the present invention easier to use. With the PBR block  102 , the user simply aligns the corresponding marks on the block  102  with the markings  142  on the body  22  and the alignment is done. This was an attempt to make a tool that didn&#39;t need instructions at all, in comparison to the prior chain repair tool, which had several pages on a web-site to explain its operation and re-configurations. 
         [0081]    Another motivation for this tool was to have “No Loose Parts” as opposed to the prior chain repair tool. The present repair tool  100  accomplishes this. As discussed above, the handle  101  has the feature that its end acts as a storage place for the adaptor  170  and rivet tip  172  when not in use. 
         [0082]    While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. 
       INDUSTRIAL APPLICABILITY 
       [0083]    The present vehicle chain repairing tool  100  is well suited generally for repairing vehicle drive chains. It accomplishes this by allowing easier pressing, breaking and riveting of links in the vehicle chain. The present invention presents a vehicle chain repairing tool for attaching, detaching and riveting chain links that combines features of several individual tools into a single convenient unit, which uses fewer parts, which is more easily converted from one configuration to another, and for which it is easily clear for which of the various operations of breaking, pressing and riveting, the tool is configured. It is noted that the basic principal and features of the present chain repair tool  100  work for both motorcycle and bicycle chains. 
         [0084]    A user may want to break a chain and then rivet it in order to effect a gearing change, replacement or engine removal. These operations may require that the chain being broken, the side plates of one or more links be replaced, and rivets be installed. These require the actions of “breaking”, “pressing” and “riveting”, respectively. 
         [0085]    One novel feature of the present vehicle chain repairing tool  100  is the PBR block  102 , which provides an accessory which allows all three of the operations of Pressing (P), Breaking (B) and Riveting (R) to be performed with minimal re-configuration of the tool  100  and which are indicated on the PBR block with corresponding markings to remind the user of the current configuration. Additionally, there is a labeled side  140  of the tool body  22 , including body indicia  142 . These include the markings “Press”  144 , “Break”  146  and “Rivet”  148 . 
         [0086]    The block  102  has three basic orientations corresponding to the operations of Pressing (P), Breaking (B) and Riveting (R), which can now be accomplished by turning the block  102  until the proper letter notation is in upright position on the side of the block  102  and the letter notation is aligned with the corresponding body indicia  142  on the tool body  22 . 
         [0087]    When the block  102  is used in breaking operations, the “B” marking  120  will be upright and located in the upper right hand corner as seen from the front of the labeled side  104 . When the block  102  is in B orientation  126 , the block  102  is seated on the lower jaw  156 . The drive bolt  28  is used in this operation, and the breaking pin  105  protrudes from the body bolt  103 . The block  102  is now aligned so that the B marking  120  is aligned with the Break marking  146 , which serves as a reminder that the vehicle chain repairing tool  100  is configured for Breaking operations. 
         [0088]    B top face  122  has a through hole  152  into which the end of the breaking pin  105  extends, and through which the chain pin  9  is ejected out through the hole  40  in the lower jaw  156  of the repair tool  100 . B left side face  128  includes location detents  158 , which help to maintain the block  102  in proper position on the lower jaw  156 . B bottom face  124  has cavity  150  with the continuation of through hole  152 . 
         [0089]    The chain  1  seats on the block  102 . The master link  10  is positioned so that one of the chain pins  9  or rivets  11  is positioned under the breaking pin  105  and over the through hole  152 . The body bolt  103  is then tightened until the chain  1  is held snugly. The drive bolt  28  is then turned by a wrench to drive the breaking pin  105  to press the chain pin  9  or rivet  11  until it protrudes from the bottom side plate  4  into the through hole  152  of the repair tool  100  and out through the bottom hole  40  of the lower jaw  156 . The breaking operation is then completed and the chain  1  is removed from the repair tool  100  in separate pieces. 
         [0090]    When the block  102  is in P orientation  116 , for pressing operations, the block  102  is attached to the lower end of body bolt  103 . The drive bolt  28  is not used in this operation, and is backed out enough that the break pin is also withdrawn up into the body bolt  103 . The block  102  is now aligned so that the P marking  110  is aligned with the Press marking  144 , which serves as a reminder that the vehicle chain repairing tool  100  is configured for Pressing operations. The lower jaw  156  includes a groove  157 , which helps to align the chain link for the operation. 
         [0091]    The P top face  112  has a cavity  150  into which the end of body bolt  103  seats. P bottom face  114  has through hole  152  and side cut-outs  154 . The cut-outs  154  allow pins to protrude through a side plate  4  for riveting or installation of a clip. 
         [0092]    The chain  1  seats on the lower jaw  156  of the vehicle chain repairing tool  100 . The master link  10  is positioned on the lower jaw  156 , and the two link pairs  2  are mounted onto the rivets  11  of the master link  10 . The side plate  4  is then placed onto the two link pairs  2 , with the ends of the rivets  11  engaged in holes in the side plate  4 . The body bolt  103  is then tightened until the block  102  engages the side plate  4 , and then is further turned by a wrench to press the side plate  4  down onto the rivets  11  until they protrude from the side plate  4  into the cut-outs  154  of the P bottom face  114 . The pressing operation is then completed and the chain  1  is removed from the repair tool  100 . 
         [0093]    When the block  102  is turned sideways, as when used in riveting operations, the “R” marking  130  will be upright and located in the lower right hand corner as seen from the front of the labeled side  104 . When the block  102  is in R orientation  136 , the block  102  is seated in the lower jaw  156 . The drive bolt  28  is not used in this operation, and is again backed out enough that the break pin is also withdrawn up into the body bolt  103 . The block  102  is now aligned so that the R marking  130  is aligned with the Rivet marking  148 , which serves as a reminder that the repair tool  100  is configured for Riveting operations. 
         [0094]    An adapter  170  is fitted onto the body bolt  103 , preferably by means of magnetic attachment, and a rivet tip  172 , which is preferably a dual sided rivet tip  174 , is also magnetically attached to the adapter  170 . The dual sided rivet tip  174  is preferably reversible, so that if it turned in a first orientation, the rivet tip  172  is configured to engage hollow nose rivets, and is thus a hollow nose rivet tip  176 , and if reversed, it is configured to engage quad stake rivets, and is thus a quad stake rivet tip  178 . When not being used for riveting operations, the adapter  170  and dual sided rivet tip  174  attach to the end of the main handle  101  and thus do not require a special carrying case 
         [0095]    R top face  132  has hole  160  into which the end of the rivet  11  seats. R top face  132  also has side cut-outs  162  into which ends of neighboring rivets  11  can fit. R left sided face  138  also has location detents  164 , which help maintain the block  102  in proper position. 
         [0096]    When the vehicle chain repairing tool  100  is configured for riveting, the block  102  acts as an anvil upon which the master link  10  is seated. The side plate  4  has been previously pressed onto the rivets  11 . The body bolt  103  is then tightened until the rivet tip  172  engages the head of the rivet  11 , and then is further turned by a wrench to press the rivet tip  172  to spread the head of the rivet  11 , and thus prevent its removal. A hollow nose rivet tip  176  has a dome-shaped tip, which engages the hollow cylinder of the hollow nose rivet, and forces the material to deform. A quad stake rivet tip  178  has a pyramidal cavity which engages the solid end of the quad stake rivet, and “swedges” the tip by deforming it into a four sided shape which also spreads the head of the rivet so it cannot be easily removed. The riveting operation is then completed and the chain  1  is removed from the vehicle chain repairing tool  100 . 
         [0097]    There are many advantages to the present vehicle chain repairing tool  100 . The vehicle chain repairing tool  100  preferably includes a modified breaking pin  105  which includes a domed upper end  182 , which more easily engages the lower end of the drive bolt  28  as it advances. This helps the breaking pin  105  stay aligned in the body bolt  103  while the drive bolt  28  is inserted. A common problem with many chain breakers is misalignment of the breaking pin. When the breaking pin is misaligned it can bind up in the body bolt and bend or break. The present invention prevents this type of damage. 
         [0098]    The present body bolt  103  incorporates a tapered passage  107  which prevents the pin from getting get bound up on the internal lip of the body bolt and break the tool. This design makes the vehicle chain repairing tool  100  easier to use and reduces the chance of damage to the tool. 
         [0099]    An additional advantage of the present invention is that it includes fewer parts by incorporated breaking, pressing and riveting operations into a single device by using the PBR block  102 . This allows the user to quickly change from breaking the chain to pressing the new link on and then riveting, with fewer parts and less time spent swapping components. It also means less separate pieces that can get lost or that need to be stored. This all results in reduced manufacturing costs. 
         [0100]    Another advantage is that the present invention is easier to use. With the PBR block  102 , the user simply aligns the corresponding marks on the block  102  with the markings  142  on the body  22  and the alignment is done. Consequently, it is thought that the present invention needs little or no instructions, in comparison to the prior chain repair tool, which required several pages to explain its operation and re-configurations. 
         [0101]    A further advantage is that the present invention has been designed to have no loose parts. The present vehicle chain repairing tool  100  includes a handle  101  that has the feature that its end acts as a storage place for the adaptor  170  and rivet tip  172  when not in use. 
         [0102]    For the above, and other, reasons, it is expected that the vehicle chain repairing tool  100  of the present invention will have widespread industrial applicability. Therefore, it is expected that the commercial utility of the present invention will be extensive and long lasting.