Abstract:
A motor-driven concrete cutting saw and method in which the motor has an idler gear, a top slider gear slidably engageable and disengageable with the idler gear; and a bottom slider gear slidably engageable and disengageable with the idler gear. Both the top and bottom slider gears have two toothed disks, and the idler gear has two toothed disks, a main gap, and a third toothed disk. The toothed disks are sized to produce, when engaged with one another, multiple speeds including a neutral setting that would allow the motor to disengage from the saw blade while running.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     This patent application claims the benefit of U.S. Provisional Application No. 61/589,849, filed Jan. 23, 2012, which is incorporated herein by this reference thereto. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to concrete cutting saws and more particularly motor-driven concrete cutting saws or saws for other hard substrates having the capability of operating at two or more speeds. 
     2. Description of the Related Art 
     Current concrete saws are limited in the number of transmission gears they offer. In addition, these saws are missing a neutral gear position. With a limited number of transmission gears, cutting through concrete becomes a more difficult and laborious task. The depth of the cut into the concrete will determine the proper torque, speed, and size of the saw required for an efficient cut. As a user cuts deeper into a concrete slab, we will want the ability to use the proper size saw spinning at the proper torque and speed. Without this option, it will take much longer to cut through the concrete slab. 
     At the same time, the user needs to be able to move the saw into various positions and locations. As concrete saws tend to be bulky and heavy, moving the saw from one location to another location is burdensome. Having the saw running makes it easier to transport, however a running blade is extremely dangerous, and such actions may be prohibited. 
     Therefore, there is a need for a concrete saw with more transmission speed options to improve the efficiency of cutting through concrete slabs and with the ability to have the saw transported easily without having the saw running. 
     SUMMARY OF THE INVENTION 
     One embodiment of the present invention comprises a motor-driven concrete cutting saw or saws for other hard substrates in which the motor has the capability of operating at two or more speeds. This particular embodiment comprises a multi-speed gear box that may additionally include a neutral setting that would allow the motor to disengage from the saw blade while running. 
     One embodiment of the present invention comprises a motor-driven concrete cutting saw capable of affording the option of two or more speeds of operation, and preferably four speeds. Some embodiments comprise a multi-speed gear box that includes a neutral setting in which the motor may disengage from the blade as a safety feature. As a result, the saw may be safely moved around in neutral without the saw blade rotating and also without having to shut off the motor each time the saw needs to be moved. 
     The innovative mechanism in one embodiment comprises one or more gears that may be moved into and out of engagement with a splined shaft. Other such embodiments may employ one or more shifting forks to facilitate smooth transitions in and out of engagement with various drive speed gears and the neutral setting. The gears, shaft and forks may be configured such that the movement from engagement to disengagement may be in the direction radially away from the shaft. In other embodiments, these elements may be configured such that the movement from engagement to disengagement may be in a direction parallel to the shaft. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  shows a perspective view of an embodiment of the transmission gears with their respective shafts removed from the gears for clarity, but shown. 
         FIGS. 1B-1G  show side views of the transmission gears in different gear positions. 
         FIGS. 2A-2C  show front, side, and rear views, respectively, of an embodiment of the top slider gear. 
         FIG. 3  shows a side view of an embodiment of the idler gear. 
         FIGS. 4A-B  show a front and side view, respectively, of an embodiment of the bottom slider gear. 
         FIG. 5A  shows an exploded view of an embodiment of the transmission gear. 
         FIG. 5B  shows an exploded view of an embodiment of the components of a gear box containing the transmission system for a concrete cutting saw. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The detailed description set forth below in connection with the appended drawings is intended as a description of presently-preferred embodiments of the invention and is not intended to represent the only forms in which the present invention may be constructed and/or utilized. The description sets forth the functions and the sequence of steps for constructing and operating the invention in connection with the illustrated embodiments. However, it is to be understood that the same or equivalent functions and sequences may be accomplished by different embodiments that are also intended to be encompassed within the spirit and scope of the invention. 
     In general, the concrete saw is similar to other concrete saws in the prior art with the exception of a new multi-speed transmission gear system that allows for four speeds and a neutral position. 
     With reference to  FIGS. 1A and 5A , the multi-speed transmission gear system  100 , comprises an input shaft  102 , and input slider gear or top slider gear  200 , an idler gear  300 , an output shaft  104 , and a bottom slider gear or output slider gear  400 . Positional terms, such as “top” and “bottom” are used for convenient nomenclature only, based on the positioning in the preferred embodiment of the present invention. These terms are not intended to be limiting with regards to position relative to each other. It is to be understood that the positions can be switched without departing from the scope of the present invention. 
     The characteristics and interactions between the top slider gear (or input slider gear)  200 , the idler gear  300 , and the bottom slider gear (or output slider gear)  400  permit the possibility of at least four speeds and a neutral. With reference to  FIGS. 2A-2C , the top slider gear  200  is operatively connectable to the input shaft  102 . In the preferred embodiment, the top slider gear  200  may be generally bolt shaped having an elongated body defining a first longitudinal axis L 1 . The top slider gear  200  has a first end  202 , a second end  204  opposite the first end  202  with the first longitudinal axis L 1  running through the first and second ends  202 ,  204  of the top slider gear  200 , and a first central channel  206  defined by a first inner surface  208  extending from the first end  202  to the second end  204  and concentric about the first longitudinal axis L 1 . The inner surface  208  may have a first splined surface  210  configured with the proper dimensions to mate or mesh with a first splined portion  117  of the input shaft  102 . 
     In the preferred embodiment, the top slider gear  200  may have a first toothed disk  220  at the first end  202  of the top slider gear  200 , the first toothed disk  220  having a first size; a body portion or top slider gear shaft  230  defined by a smooth outer surface  232  having a first end  234  and a second end  236  opposite the first end  234  of the body portion  230 , wherein the first end  234  of the body portion  230  is adjacent to the first toothed disk  220 ; and a second toothed disk  240  at the second end  204  of the top slider gear  200  adjacent to the second end  236  of the body portion  240 . The second toothed disk  240  has a second size, wherein the second size is larger than the first size. The first and second toothed disks  220 ,  240  are concentrically arranged about the first longitudinal axis L 1  but axially separated apart by the body portion  230 . The size of a toothed disk refers to the number of teeth and possibly the outer or major diameter of the toothed disk (i.e., the diameter of the toothed disk measured from the tip of one tooth to the tip of the diametrically opposite tooth). Therefore, when one toothed disk is referred to as being larger than another toothed disk it is meant that the larger toothed disk has more teeth and possibly a larger diameter than the other toothed disk. Similarly, when a toothed disk is referred to as being smaller than another toothed disk, it is meant that the smaller toothed disk has fewer teeth and possibly a smaller diameter. However, the pitch of the toothed disks that mesh with each other is the same so they can mesh with each other in use. 
     In some embodiments, the top slider gear  200  may have a first circumferential groove  238  along the smooth outer surface  232  of the body portion  230  adjacent to the first toothed disk  220 . Each toothed disk  220 ,  240  has a medial face  222 ,  242  facing each other and an outer face  224 ,  244  facing away from each other. In some embodiments, the outer faces  224 ,  244  of each toothed disk  220 ,  240  (or any other disk described herein) may be beveled to make it easier to engage with other toothed disks as described below. 
     The top slider gear  200  is operatively coupled to the input shaft  102 . The input shaft  102  in turn drives the top slider gear  200 . As shown in  FIG. 5A , in the preferred embodiment, the input shaft  102  is defined by an elongated body  110  having a first outer surface  112 , a first end  114 , and a second end  116  opposite the first end, the input shaft  102  defining a first shaft axis S 1 . The outer surface  112  may have a splined portion  117  extending from the first end  114  of the elongated body  110  of the input shaft  102  towards the second end  116  of the elongated body  110  of the input shaft  102 . In the preferred embodiment, the input shaft  102  may also have a first slot  118  at the second end of the elongated body. 
     The diameter of the input shaft  102  is substantially similar to the diameter of the first inner surface  208  in the top slider gear  200 . This permits the top slider gear  200  to mount on to the input shaft  102 . Once mounted properly, the first splined surface  210  in the top slider gear  200  meshes with the first splined portion  116  on the input shaft  102 . This meshing permits the input shaft  102  to rotate the top slider gear  200  about its first longitudinal axis L 1  while also permitting the top slider gear  200  to slide along the input shaft  102 . 
     In some embodiments, rather than splined surfaces and splined portions, other means for having the input shaft catch the top slider gear can be used. For example, any protrusion, hook, catch, protuberance, and the like, projecting radially outwardly from the input shaft  102  and radially inwardly from the inner surface (referred to as the first inner surface  208 ) defining the central channel  206  of the top slider gear  200 , such that rotational movement of the input shaft  102  about shaft axis S 1  causes the protrusion, hook, catch, protuberance, and the like to catch a reciprocal protrusion, hook, catch, protuberance, and the like on the first inner surface  208  to cause the input shaft  102  and the top slider gear  200  to rotate together. In some embodiments, input shafts having non-circular cross-sections and central channels  206  having similarly shaped cross-sectional areas can also be used to have the input shaft drive the top slider gear  200 , while permitting the top slider gear to slide along the input shaft longitudinally. 
     With reference to  FIG. 3 , the idler gear  300  has an idler gear shaft  302  defining a second longitudinal axis  12 , the idler gear shaft  302  having a first end  304  and a second end  306  opposite the first end  304 , the second longitudinal axis L 2  running through the first and second ends  304 ,  306  of the idler gear shaft  302 . A third toothed disk  320  is positioned at the first end  304  of the idler gear shaft  302 , the third toothed disk  320  having a third size. A fourth toothed disk  330  is positioned on the idler gear shaft  302  adjacent to the third toothed disk  320 , the fourth toothed disk  330  having a fourth size. A fifth toothed disk  340  is positioned at the second end  306  of the idler gear shaft  302 , the fifth toothed disk  340  having a fifth size. In the preferred embodiment, the third size is greater than the fourth, size, and the fourth size is greater than the fifth size. As the diameters of the toothed disks  320 ,  330 ,  340  are larger than the diameter of the idler gear shaft  302 , and the fourth toothed disk  330  and the fifth toothed disk  340  are separated by a specified distance, a main gap  350  is created in between the fourth toothed disk  330  and the fifth toothed disk  340 . In addition, a second gap  352  may exist between the third toothed disk  320  and the fourth toothed disk  330 . 
     The idler gear  300  and the top slider gear  400  are configured and dimensioned so as to allow specific toothed disks on the idler gear  300  to engage and disengage with specific toothed disks of top slider gear  200  depending on the positioning of the top slider gear  200  as discussed further below. In other words, the idler gear  300  and the top slider gear  200  are arranged so that their respective longitudinal axes are parallel, but not collinear with each other, but close enough together so some of the toothed disks are engageable and disengageable with each other depending on the axial positioning of the top slider gear  200  as described below. 
     With reference to  FIGS. 4A and 413 , the bottom slider  400  gear has a bottom slider gear shaft  402  defining a third longitudinal axis L 3 , the bottom slider gear shaft  402  having a first end  404  and a second end  406  opposite the first end  404 , the third longitudinal axis L 3  running through the first and second ends  404 ,  406  of the bottom slider gear shaft  400 . A second central channel  408  is defined by an inner surface of the bottom slider gear shaft  402  (referred to as the second inner surface  410 ) and extends from the first end  404  of the bottom slider gear shaft  402  to the second end  406  of the bottom slider gear shaft  402 . The second central channel  408  is concentric about the third longitudinal axis L 3 . In some embodiments, the second inner surface  410  may have a second splined surface  412 . 
     The bottom slider gear  400  further comprises a sixth toothed disk  420  at the first end  404  of the bottom slider gear shaft  400 , the sixth toothed disk  420  having a sixth size; and a seventh toothed disk  430  at the second end  406  of the bottom slider gear shaft  400 , the seventh toothed disk  430  having a seventh size. In the preferred embodiment, the sixth size is smaller than the seventh size. In some embodiments, the bottom slider gear shaft  402  may have a second circumferential groove  414  at the first end  404  of the bottom slider gear shaft  402  defined by a flanged lip  416  at the first end  404  and the sixth toothed disk  420 . 
     The bottom slider gear  400  is operatively connected to an output shaft  104  so as to be the driven gear. As shown in  FIG. 5A , the output shaft  104  is defined by a second elongated body  120  having a second outer surface  122 , a first end  124 , and a second end  126  opposite the first end, the output shaft  104  defining a second shaft axis S 2 . In the preferred embodiment, the output shaft  104  may have a second splined portion  128  in between the first end  124  of the second elongated body  120  and the second end  126  of the second elongated body  120 . The second splined portion  128  on the output shaft  104  is configured with the proper dimensions to mate or mesh with the second splined surface  412  of the bottom slider gear  400 . In the preferred embodiment, the output shaft  104  may have a second slot  130  at the first end  124  of the second elongated body  120 , and a third slot  132  at the second end  126  of the second elongated body  120 . 
     The idler gear  300  and the bottom slider gear  400  are configured with the proper dimensions so as to allow specific toothed disks on the bottom idler  400  gear to engage and disengage with specific toothed disks of the idler gear  300  as discussed further below. 
     The top slider gear  200  is able to engage and disengage from the idler gear  300  by sliding along the input shaft  102 . Similarly, the bottom slider gear  400  is able to engage and disengage from the idler gear  200  by sliding along the output shaft  104 . Sliding of the top slider gear  200  and the bottom slider gear  400  may be accomplished by shifter forks. 
     As shown in  FIGS. 1A and 5A , a top shifter fork  150  may be operatively connected to the top slider gear  200  at the first circumferential groove  238 . In the preferred embodiment, the top shifter fork  150  is defined by a first rod  152  having a first end  154  and a second end  156 , and a first forked head  158 . In the preferred embodiment, the first forked head  158  may be defined by two arms  160  (only 1 visible) converging at an elbow  162  at approximately right angles. The elbow  162  may be attached to the second end  156  of the first rod  152 . The first forked head  158  is configured with the proper dimensions to fit within the first circumferential groove  238  of the top slider gear  200 . 
     A bottom shifter fork  170  may be operatively connected to the bottom slider gear  400  at the second circumferential groove  414 . The bottom shifter fork  170  may be defined by a second rod  172  having a first end  174  and a second end  176 ; and a second forked head  178 . In the preferred embodiment, the second forked head  178  may have a plate  180  attached to an arcuate arm  182 . The plate  180  may also be attached to the second end  176  of the second rod  172 . The arcuate arm  182  is configured with the proper dimensions to fit within the second circumferential groove  414 . 
     The top slider gear  200 , idler gear  300 , and bottom slider gear  400  are uniquely configured with the proper dimensions to form a small, compact unit that engages and disengages with each other in various positions (i.e. three distinct positions each) to provide a multi-speed transmission gear having a neutral position. In particular, they are arranged with their longitudinal axis L 1 , L 2 , and L 3  parallel to each other. This space saving configuration allows the concrete saw  100  to be a reasonable size while still having more transmission speeds than current concrete saws. In addition, with the addition of multiple toothed disks on the top slider gear  200 , the idler gear  300 , and the bottom slider gear  400 , the number of different torque/speed combinations is increased over current concrete saws. 
     By way of example only, a top slider gear  200  may have a first toothed disk  220  having 24 teeth with a major diameter of 2.550 inches (major diameter meeting from the tip of one tooth to the tip of the diametrically opposite tooth), and a second toothed disk  240  having 36 teeth with a major diameter of 3.750 inches; an idler gear  300  may have a third toothed disk  320  having 36 teeth with a major diameter of 3.750 inches, a fourth toothed disk  330  having 30 teeth with the major diameter of 3.150 inches, and a fifth toothed disk  340  having 24 teeth with the major diameter of 2.550 inches; and a bottom slider gear  400  may have a sixth toothed disk  420  having 30 teeth with the major diameter of 3.150 inches, and a seventh toothed disk  430  having 36 teeth the major diameter of 3.750 inches. The pitch for each of these toothed disks is the same at  10 . 
     With reference to  FIGS. 1B-1G , in the neutral gear position, the second toothed disk  240  on the top slider gear  200  and the sixth and seventh toothed disks  420 ,  430  on the bottom slider gear  400  reside in the main gap  350  of the idler gear  300 . Due to the precise dimensioning of the gears, the first toothed disk  220  on the top slider gear  200  can reside in the main gap  350  or reside above the fourth toothed disk  330  but in a disengaged configuration, as shown in  FIG. 1C . 
     The following references to first, second, third, and fourth gear positions are not meant to be limiting to indicate any progression between the torque and speed imparted onto the gears by these positions. Rather, reference to first, second, third, and fourth gear positions merely indicate that each gear position has a different torque and/or speed relative to another gear position. For example, the first gear position may not necessarily be the highest torque and lowest speed position. It is to be understood that a person of ordinary skill in the art would be able to figure out the relative torque and/or speed of each gear position based on which tooth disks are engaged and the toothed disk sizes. 
     That being said, as shown in  FIG. 1D , the transmission gear can be shifted from neutral into a first gear position by sliding the top slider gear  200  so that the first toothed disk  220  resides above and engages the third toothed disk  320  on the idler gear  300  while the second toothed disk  240  on the top slider gear  200  resides in the main gap  350 , and sliding the bottom slider gear  400  so that the sixth toothed disk  420  on the bottom slider gear  400  resides below and engages with the fourth toothed disk  330  of the idler gear  300  while the seventh toothed disk  430  of the bottom slider gear  400  resides within the main gap  350 . 
     As shown in  FIG. 1E , the transmission gear can be shifted into a second gear position from the neutral position by sliding the top slider gear  200  so that the first toothed disk  220  on the top slider gear  200  resides above and engages the third toothed disk  320  on the idler gear  300  while the second toothed disk  240  on the top slider gear  200  resides in the main gap  350 , and sliding the bottom slider gear  400  so that the seventh toothed disk  430  on the bottom slider gear  400  resides below and engages with the fifth toothed disk  340  on the idler gear  300  while the sixth toothed disk  420  resides within the main gap  350 . 
     As shown in  FIG. 1F , the transmission gear can be shifted into a third gear position from the neutral position by sliding the top slider gear  200  so that the second toothed disk  240  on the top slider gear  200  resides above and engages with the fifth toothed disk  340  on the idler gear  300 , while the first toothed disk  200  remains disengaged from the idler gear  300 , and sliding the bottom slider gear  400  so that the sixth toothed disk  420  on the bottom slider gear  400  resides below and engages with the fourth toothed disk  330  on the idler gear, while the seventh toothed disk  430  resides in the main gap  350 . 
     As shown in  FIG. 1G , the transmission gear can be shifted into a fourth gear position from the neutral position by sliding the top slider gear  200  so that the second toothed disk  240  on the top slider gear  200  resides above and engages with the fifth toothed disk  340  on the idler gear  300 , while the first toothed disk  220  remains disengaged from the idler gear  300 , and sliding the bottom slider gear  400  so that the seventh toothed disk  430  on the bottom slider gear  400  resides below and engages with the fifth toothed disk  340  on the idler gear  300 , while the sixth toothed disk  420  resides within the main gap  350 . 
     Therefore, the top slider gear  200  has three positions, one in which neither of its toothed disks are engaged with the idler gear  300 , one in which the first toothed disk  220  is engaged with the idler gear  300  but not the second toothed disk  340 , and one in which the second toothed disk  240  is engaged with the idler gear  300  but not the first. Similarly, the bottom slider gear  400  has three positions, one in which neither of its toothed disks  420 ,  430  are engaged with the idler gear  300 , one in which the sixth toothed disk  420  is engaged with the idler gear  300  but not the seventh toothed disk  430 , and one in which the seventh toothed disk  430  is engaged with the idler gear  300  but not the sixth toothed disk  420 . Although the shifting of gears were described from neutral, shifting from one gear position to another gear position can take place from any starting gear position, not just from neutral. 
     The top slider gear  200  is moved along the input shaft  102  via the top shifter fork  150  and the bottom slider gear  4001  is moved along the output shaft  104  via the bottom shifter fork  170  to achieve the configurations described above. In some embodiments, each shifter fork may be moved independent of each other. In other embodiments, a main stick may control both shifter forks  102 ,  104  simultaneously or in series, such that a first main stick position of the main stick automatically puts the top slider gear  200  and the bottom slider gear  400  into the proper position for the first gear position, a second main stick position automatically puts the top and bottom slider gears in the proper position for the second gear position, and so on. 
     In an alternative embodiment, the four-speed transmission with a neutral can be designed using a top slider gear having two toothed disks, the idler gear having two toothed disks, and the bottom slider gear having two toothed disks, wherein the toothed disks are of different sizes so as to create four different torque/speed outputs, and a neutral, utilizing the concepts discussed above. 
     Table 1 shows a listing of parts that can be used to manufacture an embodiment of the transmission gear of the present invention according to the exploded view shown in  FIG. 5B . 
     
       
         
               
               
               
             
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 No. 
                 Description 
                 QTY. 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 1 
                 Seal 40 × 60 × 10 
                 1 
               
               
                 2 
                 HEX PLUG 2HP50NS 
                 9 
               
               
                 3 
                 SHCS 5/16-18 × 1¼″ 
                 12 
               
               
                 4 
                 END COVER (OPEN) 
                 1 
               
               
                 5 
                 BEARING 22208 
                 1 
               
               
                 6 
                 DOWEL PIN ¼ × ⅝″ 
                 4 
               
               
                 7 
                 BEARING 22206 
                 3 
               
               
                 102 
                 INPUT SHAFT 
                 1 
               
               
                 9 
                 EXT SNAP RING 1 9/16 
                 1 
               
               
                 150 
                 TOP SHIFTER FORK 
                 1 
               
               
                 200 
                 TOP SLIDER GEAR 
                 1 
               
               
                 170 
                 BOTTOM SHIFTER FORK 
                 1 
               
               
                 300 
                 IDLER GEAR 
                 1 
               
               
                 14 
                 BEARING 30209 
                 1 
               
               
                 400 
                 BOTTOM SLIDER GEAR 
                 1 
               
               
                 104 
                 M60DSS/M60D/M72D OUTPUT SHAFT 
                 1 
               
               
                 17 
                 BHCS 10-24 × ½″ 
                 14 
               
               
                 18 
                 RUBBER END CAP McMASTER 6448K82 
                 2 
               
               
                 19 
                 COOLER PLATE 
                 1 
               
               
                 20 
                 CENTER CASTING 
                 1 
               
               
                 21 
                 BARB FITTING ½ BARB ⅜ NPT 
                 2 
               
               
                 22 
                 ½″ HOSE CLAMP 
                 2 
               
               
                 23 
                 BELT TENSIONER 
                 1 
               
               
                 24 
                 BLACK WATER HOSE ½″ × 14″ 
                 1 
               
               
                 25 
                 SHCS 10-24 × ¾″ 
                 10 
               
               
                 26 
                 COOLER COVER 
                 1 
               
               
                 27 
                 BARB FITTING ½ BARB ½ NPT 
                 2 
               
               
                 28 
                 INTERMEDIATE PLATE 
                 1 
               
               
                 29 
                 MAGNETIC PLUG ½ NPT 
                 1 
               
               
                 30 
                 END COVER (BLIND) 
                 1 
               
               
                 31 
                 NOTCHED BRACKET 
                 1 
               
               
                 32 
                 SHIFTER HOUSING 
                 2 
               
               
                 33 
                 SEAL SKF 4931 
                 2 
               
               
                 34 
                 SHIFT LEVER 
                 2 
               
               
                 35 
                 ½″ SHAFT COLLAR MCMASTER 6435K14 
                 8 
               
               
                 36 
                 SHCS 8-32 × ⅝ 
                 8 
               
               
                 37 
                 SPRING (CS # B11-59) 
                 2 
               
               
                 38 
                 PLUG ¼ NPT SQUARE HEAD 
                 1 
               
               
                 39 
                 BEARING 6011 OPEN 
                 1 
               
               
                 40 
                 O-RING # 154 McMASTER 9396K175 
                 2 
               
               
                 41 
                 CUP 362A 
                 1 
               
               
                 42 
                 CONE 367 
                 1 
               
               
                 43 
                 SHCS 5/16-18 × ¾″ 
                 4 
               
               
                 44 
                 SHORT HOUSING 
                 1 
               
               
                 45 
                 SHCS 5/16-18 × 2¼″ 
                 8 
               
               
                 46 
                 SPACER BUSHING 
                 1 
               
               
                 47 
                 MOUNTING CLAMP 
                 2 
               
               
                 48 
                 M60DSS/M60D/M72D LONG HOUSING 
                 1 
               
               
                 49 
                 BEARING 22210 
                 1 
               
               
                 50 
                 ¼ SPCER 
                 1 
               
               
                 51 
                 SEAL PACKAGE 
                 2 
               
               
                 52 
                 O-RING # 327 McMASTER 9396K49 
                 4 
               
               
                 53 
                 SEAL SLEEVE PACKAGE 
                 2 
               
               
                 54 
                 SEAL CUP 
                 2 
               
               
                 55 
                 SEAL SLEEVE RETAINER 
                 2 
               
               
                 56 
                 SET SCREW 5/16-24 × ½″ 
                 6 
               
               
                 57 
                 EXT SNAP RING HEAVY DUTY 1¾ 
                 2 
               
               
                 58 
                 KEY 5/16 × 13/16 (M60DSS, M60D, M72) 
                 1 
               
               
                 59 
                 GROOVED PLATE 
                 1 
               
               
                 60 
                 SEAL SKF 25661 
                 1 
               
               
                 61 
                 SET SCREW 6-32 × ¼″ 
                 4 
               
               
                 62 
                 SPEEDI SLEEVE CR 99254 
                 1 
               
               
                 63 
                 SEAL SLEEVE BUSHING 
                 2 
               
               
                 64 
                 SKID PLATE 
                 1 
               
               
                 65 
                 ¼ FLAT WASHER 
                 4 
               
               
                 66 
                 BOLT ¼-20 × ½″ 
                 4 
               
               
                 67 
                 STOP CLAMP 
                 2 
               
               
                 68 
                 BOLT 5/16-18 × 2″ 
                 2 
               
               
                 69 
                 NYLON LOCK NUT 5/16-18 
                 2 
               
               
                 70 
                 SHCS 5/16-18 × ½″ 
                 4 
               
               
                 71 
                 5″ INNER BLADE COLLAR (M60DSS, M60D) 
                 2 
               
               
                 72 
                 5 × 5/8 OUTER B.C. (M60DSS, M60D) 
                 2 
               
               
                 73 
                 6″ INNER BLADE COLLAR (M72D) 
                 2 
               
               
                 74 
                 6 × ⅝ OUTER B.C. (M72D) 
                 2 
               
               
                 75 
                 DOWEL PIN ⅜ × ⅝ 
                 2 
               
               
                 76 
                 DOWEL PIN ⅜ × 1¼ 
                 2 
               
               
                 77 
                 STUD RHT 
                 1 
               
               
                 78 
                 STUD LHT 
                 1 
               
               
                 79 
                 O-RING # 020 
                 2 
               
               
                 80 
                 NUT 1-14 RHT 
                 1 
               
               
                 81 
                 NUT 1-14 LHT 
                 1 
               
               
                 82 
                 BUSHING RHT 
                 1 
               
               
                 83 
                 BUSHING LHT 
                 1 
               
               
                 84 
                 WASHER 
                 2 
               
               
                 85 
                 BOLT ⅝-11 × 1½ RHT 
                 1 
               
               
                 86 
                 BOLT ⅝-11 × 1½ LHT 
                 1 
               
               
                 87 
                 TURNBUCKLE ½-13 LHT 
                 1 
               
               
                 88 
                 COUPLING NUT 4″ ½-13 R&amp;L 
                 1 
               
               
                 89 
                 NUT ½-13 
                 1 
               
               
                 90 
                 TURNBUCKLE ½-13 RHT 
                 1 
               
               
                 91 
                 DRILL BUSHING 7/16OD × 0.251D × 1/2L 
                 2 
               
               
                 92 
                 BARB FITTING ½ BARB ¼ NPT 
                 2 
               
               
                   
               
             
          
         
       
     
     While the present invention has been described with regards to particular embodiments, it is recognized that additional variations of the present invention may be devised without departing from the inventive concept.