referring now to the drawings wherein the showings are for the purpose of illustrating preferred embodiments of the invention only and not for the purpose of limiting same , fig1 shows an anti - reverse large arbor fly fishing reel 10 in accordance with the present invention . the reel 10 comprises several parts and subassemblies including a frame 12 , a foot 14 , a friction plate assembly 16 , the handle assembly 18 , a drag knob assembly 20 , and a spool 22 . many of the parts and assemblies of the reel 10 rotate around a central axis 30 . in use , the frame 12 does not rotate . a hollow frame shaft 32 has an enlarged base 34 which is fixed to the frame side wall 36 by means of machine screws or the like ( not shown ). the frame side wall 36 is generally disk shaped with a top axial extension 36 a and a bottom axial extension 36 b . the foot 14 is fixed to the top axial extension 36 a as is conventional . the frame shaft 32 has a cylindrical outer surface . a hollow friction plate shaft 38 surrounds the frame shaft 32 over a substantial portion of the blank . the friction plate shaft 38 has an enlarged base which is fixed to a friction plate 42 . the friction plate 42 serves multiple functions and is sometimes referred to as a ratchet plate . as can be best seen in fig2 the friction plate 42 is generally disk shaped extending radially outwardly from the axis 30 of the reel . the friction plate 42 has an annular ratchet flange 44 extending toward the frame side wall 36 . the ratchet flange 44 has an inner surface with a sawtooth surface 48 . spring loaded ratchet pawls 46 are fixed to the frame 12 and engage the sawtooth surface 48 on the flange 44 allowing the friction plate 42 to rotate in one direction only with respect to the frame 12 . the structure and operation of the ratchet flange 44 and ratchet pawls 46 are substantially the same as used and described in lepage 6 , 155 , 508 and will not be further described herein . the ratchet mechanism is switchable . in one position , the friction plate assembly 16 ( the friction plate 42 and the friction plate shaft 38 ) can rotate clockwise and only clockwise with respect to the frame 12 . in the second position , the friction plate assembly 16 can rotate counterclockwise and only counterclockwise with respect to the frame 12 . the friction plate shaft 38 is cylindrical over most of its length starting from the enlarged base 40 . the portion of the friction plate shaft remote from the base 40 has four flat sides giving it a generally rectangular cross - section with rounded corners . a handle arm 50 forming part of the handle assembly 18 has a central aperture with a cross - section identical to the external cross - section of the end of the friction plate shaft 38 . the handle arm 50 is mounted on the friction plate shaft 38 and therefore rotationally fixed to the friction plate shaft 38 and can rotate with and only with the friction plate shaft 38 . the handle plate aperture has an enlarged portion accommodating a ball bearing 52 . the ball bearing 52 bears against the handle shaft 50 and also against frame shaft 32 . similarly , a ball bearing 54 is positioned between the end of the frame shaft 32 closest to the frame side wall and the friction plate 42 . thus , the friction plate assembly 16 is rotatably supported with respect to the frame shaft 32 on ball bearings 52 , 54 for smooth rotation in the selected direction . the handle assembly 18 comprises the handle arm 50 , a spool handle knob 56 and a spool handle knob axle 58 . the spool 22 is comprised of an inner spool cylinder 60 an outer spool cylinder 62 , a spool web 64 , a first spool side wall 66 , and a second spool side wall 68 . the inner spool cylinder 60 is supported on two ball bearings 70 , 72 which engage the inner spool cylinder 60 and the cylindrical portion of the friction plate shaft 38 . the spool web 64 is robust and rigidly supports the remaining elements of the spool on the inner spool cylinder 60 . the spool side wall 66 , 68 and outer spool cylinder 62 form a cylindrical trough which will carry a fly line for use in fly fishing . the surface of the first spool side wall 66 facing the frame 12 supports an annular body of friction material 74 . this annular body is also sometimes referred to as the first ( or spool ) drag surface . the spool drag surface 74 engages a second annular body of friction material 76 which bears against the first body of friction material 74 . the first body of friction material 74 is permanently bound to the spool by means of adhesive or the like . the second body of friction material 76 is permanently bound to the ratchet plate 42 by adhesive or the like . one of the bodies of friction material is a composite . the other body is rulon brand ptfe as is conventional in drag design . the spool 22 also contains a clicker pawl 78 containing a recess in the periphery of the first spool side wall 66 . the clicker pawl engages teeth 80 evenly spaced around the entire periphery of the friction plate 42 . the design and operation of the clicker pawl and teeth are substantially similar to similar structures and operation described and illustrated in lepage 6 , 155 , 508 . from the above description , it can be seen that the spool 22 and friction plate assembly 16 can rotate as a unit in one direction . in this direction , the line in direction , the two friction material surfaces 74 , 76 do not move with respect to one another and rotation of the spool 22 is relatively friction free . when the spool is rotated in the opposite direction , the ratchet pawls 46 engage the sawtooth surface 48 on the friction plate 42 preventing rotation of the friction plate assembly 16 . the spool must therefore rotate with respect to the friction plate assembly 16 creating friction between the two friction material layers 74 , 76 which adds drag to rotation in the line out direction . as the handle assembly 18 is fixed to the friction plate shaft 38 , the handle assembly does not rotate in the line out direction . as described earlier , the line out direction can be either clockwise or counterclockwise as selected by the user by placement of the pawls 46 . the amount of retarding torque exerted on the spool by the action of the two friction surfaces 74 , 76 is adjustable with the drag knob assembly 20 . a drag knob shaft 90 passes through the central aperture of the frame shaft 32 from one side of the reel to the other . a pin ( not shown ) is press fit into an alignment hole 92 and extends into mating slots ( not shown ) in the frame shaft 32 . the slots extend axially along the frame shaft 32 allowing movement of the drag knob shaft 90 axially within the frame shaft 32 but preventing rotational movement . the drag knob shaft 90 has an enlarged head 94 resting and in recess in the drag knob 96 . the drag knob 96 has a central bore which is coaxial with the reel axis 30 and surrounds the drag knob shaft 90 . the drag knob 96 is threaded over a portion of the central bore . the drag knob shaft 90 has a threaded portion 98 engaging the threads on the drag knob 96 . therefore , when the knob 96 is rotated , the shaft 90 is moved axially . the end of the drag knob shaft 90 remote from the drag knob 96 has a threaded bore 102 which accepts an arm cap screw 104 . the cap screw 104 has an enlarged head with an inwardly facing shoulder which engages against the ball bearing 52 which in turn engages against the handle arm 50 . the handle arm 50 , as previously described , is slidably mounted upon the friction plate shaft 38 . the handle arm 50 has an inwardly facing surface 110 which bears against a coil spring 112 contained within a spring holder 114 . the spring holder 114 in turn bears against the ball bearing 70 which bears against a shoulder on the spool 22 . this structure applies spring force from the spring 112 axially urging the spool 22 and the spool friction material surface 74 against the friction material surface 76 on the ratchet plate 42 . by turning the drag knob 96 in a tightening direction , the drag knob shaft 90 is pulled toward the drag knob ( to the right in fig2 ). the drag knob shaft must move axially when the threads are turned as it cannot move radially due to the presence of the pin in the alignment hole 92 . moving the drag knob shaft 90 to the right pulls the handle arm 50 against the spring 112 compressing the spring and increasing the force exerted normally to the friction surfaces 74 , 76 . the drag or retarding torque exerted on the spool is thereby increased . as can be seen in fig2 the drag knob 96 has an enlarged disk portion 100 and a cylindrical extension 124 . the disk portion is provided with a number of spring - loaded detente posts 116 . the detente posts engage selected ones of an array of dimples 126 arranged in a circle around the axis 30 on a drag offset disk 120 . the drag offset disk 120 is shown in more detail in fig5 a , 5 b , and 5 c . the drag offset disk 120 has a central aperture 122 through which the cylindrical extension 124 of the drag knob 96 passes . on the side of the drag offset disk 120 facing the drag knob disk portion 100 , a plurality of dimples 126 are spaced around a circle coaxial with the axis of the reel . the dimples interact with the detente posts 116 described above . the side of the drag offset disk 120 opposite the dimpled side , illustrated in fig5 a , has a number of grooves in its surface . each groove 130 has a shallow dimple 132 at one end and a deeper dimple 134 at the other end . the grooves are sloped from a shallow portion near the shallow dimple 132 to a deeper and wider portion near the deeper dimple 134 . the shallow end of the groove adjacent the shallow dimple 132 is somewhat less deep than the shallow deep dimple itself . similarly , the groove 130 directly adjacent the deeper dimple 134 is somewhat less deep than the dimple 134 itself . on larger reels , four sets of grooves and dimples are spaced evenly around the drag offset disk 120 . on smaller reels , three sets of grooves and dimples are spaced around the drag offset disk 120 . a pin 136 is press fit into a blind hole 138 near the central aperture of the drag offset disk 120 . a drag offset handle 140 extends outwardly from the periphery of the disk portion of the drag offset disk 120 . fig6 shows an enlarged detail of the outwardly facing portion of the frame 12 directly adjacent the drag offset disk 120 . the frame has an aperture 144 accommodating the drag knob extension 124 at its center . surrounding the central aperture are four larger holes 146 which accommodate spheres 148 ( fig2 ). these holes are spaced 90 ° apart in larger reels . in smaller reels , only three holes are present , spaced 120 ° apart . four smaller holes 152 are also evenly spaced around the center axis of the reel . the smaller holes 152 are threaded . machine screws are used to fix the frame shaft 32 to the frame 12 using the four holes 152 . an arcuate slot 154 penetrates through the frame wall close to the central aperture 144 . the slot accommodates the pin 136 held in the blind hole 138 when the drag offset disk 120 is assembled onto the reel . the length of the slot is selected to limit the rotation of the drag offset 120 so that the disk can move between a position where the spheres 148 engage the shallow dimples 132 on the one extreme and the deeper dimples 134 at the other extreme . thus , on a larger reel with four races , the center point of the shallow dimple is spaced from the center point of the deeper dimple a radial distance of 60 °. the slot 154 is sized to allow 58 ° motion of the pin 136 providing two positive stops with the spheres 148 just engaging the dimples at either end of the grooves 130 . of course a different slot length would be selected if different length grooves were selected . a comparison of fig2 and 4 illustrates the operation of the drag offset disk 120 and the reel in general . looking first at fig2 one sees the reel 10 with the drag offset disk 120 in the light drag position . the drag knob 96 is turned until the appropriate light drag is achieved . often a fisherman will select a drag sufficient to prevent overrun only which allows line to be easily taken off the reel but prevents the reel from continuing to spin after tension is removed . in this configuration , a light spring pressure is exerted by the spring 112 against the spool 22 . line may be removed by the angler by simply pulling on the line causing the spool 22 to spin with respect to the frame 12 . the friction plate assembly 16 does not spin as line is removed . therefore , the handle assembly 118 including the retrieve handle 160 remains stationary . line may be easily removed from the spool by the fisherman and may be easily retrieved by simply grasping the retrieve handle 160 and rotating in the only possible direction pulling in line . in the line in direction , the handle arm 50 , friction plate assembly 16 , and spool 22 rotate as a unit . the drag is therefore not engaged and no resistance to rotation is created . this configuration is often used when an angler is casting to fish . the angler can easily pay out or retrieve line to cast a fly to the appropriate location . when a fish takes the fly , an angler will wish to apply more drag but not too much more drag . this is accomplished with the present invention by moving the drag offset disk 120 from the light drag position seen in fig1 and 2 to the heavy drag position seen in fig3 and 4 . the handle 140 is pushed from one stop to the other as seen in fig3 causing the disk to rotate an appropriate amount , in the illustrated embodiment , 60 °. the spheres 148 which were previously engaged in the deeper dimples 134 are now engaged in the shallow dimples 132 . the drag knob 96 is pushed away from the frame 12 which in turn draws the handle arm 50 inwardly compressing the spring 112 . a predetermined increase in spring force is thereby applied to the spool and the normal force applied to the two friction material surfaces 74 , 76 is increased . drag torque resistance is increased to a fighting drag level . the amount of drag resistance increase is preset by selecting an appropriate difference in depth of the shallow dimples 132 when compared to the deeper dimples 134 . this distance is directly translatable into an increased in spring compression and spring force exerted on the spool . the normal compressive force to the friction surfaces is increased a preset amount in a predictable way . the angler can also preset a desired fighting drag by adjusting the knob 96 when the drag offset disk 120 is in the heavy drag position seen in fig3 and 4 . after presetting the desired fighting drag , the angler simply switches to the light drag configuration seen in fig1 and 2 providing a significantly lighter drag usable while casting . fig7 illustrates an alternative embodiment for the drag offset disk 120 . rather than having a single handle 140 , a star - shaped disk is used having several outwardly extending tabs 166 regularly spaced around the periphery of the disk 120 . all other operative portions of the disk remain identical . fig8 shows another variation of the drag offset disk 120 in which the circumference of the disk is enlarged and an upstanding rim is provided around its periphery . the rim 170 is textured on its outer surface to provide easy gripping . the advantage of this design is ease of adjusting between the light and heavy drag set and a lack of protuberances which can tangle line . the above - described reel provides an anti - reverse large arbor reel suitable for use in the saltwater environment with a very smooth and versatile drag mechanism . the controls for the reel with two drag adjustments on one side and an anti - reverse retrieve handle on the other provide ease of use . these advantages and others are provided by the structures described above . while the invention has been described with reference to preferred embodiments , obviously , modifications and alterations to these structures will occur to others upon the reading and understanding of this specification . it is intended to include all such modifications and alterations insofar as to come within the scope of the appended claims or the equivalence thereof .
an anti - reverse large arbor fly fishing reel is provided which is robust in design and has a superior drag . the reel includes a drag offset structure allowing an angler to switch between a preset light drag to a preset heavy drag while still allowing full adjustability of drag force .