referring now to fig1 there is shown a circuit - like conveying system 10 generally which includes a lower or treatment conveying line 12 generally , a lift or transfer mechanism 14 positioned at the end of the lower treatment line to retrieve work pieces therefrom . an upper or drying conveying line 16 is provided to receive treated work pieces from the lift or transfer mechanism 14 . a second lift mechanism 18 is positioned at the end of the drying line 16 to retrieve dried work pieces therefrom and transfer those work pieces to a remote conveyor 20 ( see fig1 ). untreated work pieces can be moved from the remote conveyor 20 to the entrance for the lower conveyor line 12 . the work pieces are supported on a walking beam assembly 22 which is suspended from a hoist mechanism 24 which cooperates with a travel mechanism 26 that can be indexed forwardly one treatment station or backwardly one treatment station . the walking beam assembly 22 , the hoist mechanism 24 and the travel mechanism 26 are interconnected , interrelated and work together to transport , raise and lower work pieces . however , in the description herein the assembly 22 and mechanisms 24 and 26 may be described or referred individually . the conveying system 10 includes a stationary support frame 28 which supports the lower conveying line 12 , the upper conveying line 16 , the hoist mechanism 24 and the travel mechanism 26 . as seen in fig2 a work piece such as 30 is positioned above the treatment tank 32 for lowering into the tank 32 and subsequent treatment . it will also be appreciated that the circuit - like conveying system 10 has depth or is three dimensional and accommodates wide work pieces such as 30 . it is also seen that the frame 28 spans a treatment tank such as 32 . the operation of the walking beam assembly 22 with respect to the work pieces and the hoist and travel operation is best seen in fig3 - 11 inclusive . referring to fig3 , 7 , 10 and 11 , the beam assembly 22 includes a pair of spaced rails 22 a and 22 b . associated with each rail are l - shaped hanger engaging members such as 34 . the beam assembly 22 is raised and lowered by a plurality of chains such as 36 . a work piece hanger such as 38 is arranged to support a depending work piece 40 and to engage the hanger engaging member such as 34 . as seen in fig3 work pieces such as 40 , 42 and 44 can be suspended from the beam assembly 22 over tanks such as 46 , 48 and 50 . referring to fig5 the beam assembly 22 is lowered and the work pieces 40 , 42 and 44 are immersed in tanks 46 , 48 and 50 . the hangers such as 38 engage and rest on the side of the tanks and the hanger engaging members such as 34 are disengaged from the work pieces and can be moved to a position just below the hanger itself . then the beam 22 is no longer engaged with the hangers and can be moved rearwardly one station as suggested in fig7 . then referring to fig1 , the beam 22 is raised and as it is raised it engages the hangers for work pieces 40 , 42 and 44 . but it will be noted that the rearward hanger engaging member is open ( see fig7 ) and can pick up a new work piece such as 52 in fig1 . then the beam assembly 22 can be moved forwardly as in fig1 thereby indexing the work pieces one station forwardly . it will be noted that each station is spaced the same distance from an adjacent station . referring now to fig4 the hanger 38 supporting the work piece 40 and hanger engaging member bracket 34 are seen . in fig6 the hanger 38 is lowered to rest on the edge of the tank such as 46 and the hanger engaging member 34 is shown in engagement with the hanger and the work piece 40 is shown there below . as seen in fig8 the hanger engaging member 34 is positioned below and disengaged from the hanger 38 and is in position to be moved rearwardly with respect to the tank . referring to fig9 the hanger 38 is shown as a square tube and the hanger engaging member 34 includes an angle iron 34 a which is positioned to engage the hanger 38 and support the same . it is seen that based upon the movement of the beam 22 downwardly , rearwardly , upwardly and forwardly the work pieces are moved in a rectangular pattern so as to move the work piece from one tank to another . [ 0048 ] fig1 shows the entire circuit - like conveying apparatus 10 in a diagrammatic fashion . there the remote conveyor 20 and the lift mechanism 18 are shown whereby an untreated work piece can be removed from the conveyor 20 , delivered to the lower conveyor line 12 onto the beam assembly 22 so as to be moved to the treatment tanks , then moved to the end of the conveyor 12 where the transfer mechanism 14 can retrieve the work piece and move it upwardly to the drying or upper conveyor 16 . the upper conveyor 16 is a chain - like conveyor line that is positioned within an oven so as to form a drying line . due to the heat to which the chain is exposed , the chain may lengthen and a take - up or tightening mechanism is provided within the oven so as to adjust the chain . sometimes , it is desirable to prevent a work piece from being immersed or dipped in a particular tank . a hook assembly 50 is provided that is secured to a stationary structure 51 secured to the frame 28 ( see fig1 and 13 - 17 ). the hook assembly includes an inverted u - shaped frame 52 that is secured to the stationary structure 51 , two hingedly connected depending hooks 54 and 56 and an actuator bar 58 with an outwardly extending arm 59 that connects the hooks 54 and 56 for joint movement . a pneumatic cylinder 60 is connected at one end to the frame section 52 and at the other end to the actuator bar 58 via the arm 59 . by retracting the piston the bar is rotated and the hooks 54 and 56 raised to a nonengaging position . by extending the piston rod the hooks are rotated to a position so that when the other work pieces are lowered the hooks engage a hangar such as 62 and prevent or restrain the associated work pieces from being lowered . when the beam is raised for movement , the hooks can be rotated to an inoperative position and the previously restrained work piece engages the appropriate support on the beam , the work piece is moved to the next position and can be lowered and raised the other work pieces as seen in fig1 . the interrelations and interconnections of the travel and hoist mechanisms 24 and 26 and the beam assembly 22 are seen in fig1 - 23 inclusive . for purposes of description these mechanisms and assemblies have been described separately . referring first to fig1 the stationary frame 28 includes an end section such as 70 and a pair of rails 72 a and 72 b . the travel mechanism 26 and hoist mechanism 24 are associated with the frame 28 . the beam assembly 22 which supports the various hangers from the hoist mechanism by a plurality of spaced chains such as 74 and 76 and the previously identified chain 36 . the chains are spaced along the length of the beam so as to evenly raise and lower the beam the chains are vertically orientated but trained about a plurality of vertically orientated sprockets such as 78 and 80 which are secured to the travel frame 82 and rotate about a horizontal axis . the chains such as 74 and 76 are trained about the sprockets and are secured at their end to the pull rods 84 and 86 . the pull rods 84 and 86 are operated by a winch or spool 88 about which cables such as 90 and 92 are trained . a cable such as 90 passes through a set of pullies which permit it to retract the pull rods such as 86 . those pullies include the horizontally arranged pulley 94 , the pulley 96 and the pulley 98 . it will be noted that the end of the cable 90 is grounded or secured to the frame 82 at a point 100 similarly the pullies 94 and 96 are secured to brackets that are also grounded . as seen in fig1 and 20 by winding the cables 90 and 92 about the drum 88 the pull rods 84 and 86 are retracted and thus draw the frame assembly 22 upwardly through the action of the chains 74 and 76 and other chains which are connected to the pull rod and the assembly such as 102 and 104 . the frame 22 is shown in a lower position in fig2 in which the drum 88 is reversed and the weight of the frame 22 tends to pull the frame downwardly and coacts with the pull rods 84 and 86 and chains 74 , 76 , 102 and 104 . the spool 88 , cables 90 , 92 , rollers 94 , 96 , 98 and grounding position 100 can also be seen in fig2 . referring to fig2 the hoist mechanism 24 , the travel mechanism 26 and the beam assembly 22 is seen in elevational view and the beam assembly 22 is in the upper position . as indicated above the entire beam assembly 22 and take up apparatus can be indexed one station forwardly or one station rearwardly so as to remove the work pieces from a first tank , raise them and move them to a second tank and then lower them . referring to fig1 , horizontal movement of the beam assembly 22 is controlled by the travel motor 110 drive shafts such as 112 stops 114 and 116 and the traveler or drive mechanism 118 generally ( which is also seen in fig2 ). fundamentally the traveler 118 moves back and forth between the stops 114 and 116 along the chain 120 . it is seen that with the respect to the traveler movement the chain 120 is trained about an idler sprocket 122 , a driven sprocket 124 and another idler sprocket 126 . thus the motor 110 rotates the drive shaft 112 which causes the sprocket 124 to rotate . the chain 120 is drawn beneath the idler sprocket 122 over the drive sprocket 124 and beneath the idler sprocket 126 to cause the traveler mechanism 118 to move toward one of the stops 114 or 116 . it will be appreciated that when the traveler mechanism moves the hoist mechanisms 24 similarly moves and so does the walking beam assembly 22 . the mechanism is then reversed and the walking beam is moved to the other end at stop 114 . at that point the beam 22 may be raised so as to lift the appropriate hangers and thus the work pieces have been indexed or moved one station forwardly . the transfer or lift mechanism can be seen in fig2 - 28 inclusive . however , reference is made to fig1 where the lift mechanisms 14 and 18 are shown at either end of the conveyor whereby work pieces can be lifted by a lift mechanism 14 from the end of the lower line 12 to the line 16 . other lift mechanism can move dried work pieces from the upper line 16 to the remote conveyor 20 and from the remote conveyor 20 untreated pieces can be removed and delivered to the lower conveyor 12 . referring now to fig2 , a lift mechanism 150 generally is shown . the lift includes a pair of side posts 152 and 154 which together with cross members 156 and 158 define a frame . within the frame there is provided a carrier 160 generally which can be moved vertically upwardly or downwardly in the larger frame . a pair of arm assemblies 162 and 164 are secured to the carrier and can move inwardly or outwardly and from one side to the other side of the carrier 160 . the carrier 160 includes an upper cross member 166 and a lower cross member 168 . a pair of vertical members 170 and 172 connect the cross members 166 and 168 and cooperate the posts 152 and 154 which have rails therein . the carrier 160 is raised or lowered by a driven chain and counter weight mechanism . the drive motor 174 is connected via a shaft such as 176 to chain drive sprockets 178 and 180 on the opposite sides of the lift . at the top of the lift mechanism idler sprockets 182 and 184 are provided . drive chains 186 and 188 are trained about the drive sprockets such as 178 and 180 . the chain such as 186 is connected to the carrier 160 by a bar such as 189 . the chain 186 is also connected to the counter weight 190 but on the opposite side of the chain . thus the motor 174 can drive the chain so that the counter weight 190 moves upwardly and the carrier 160 via bar 189 descends . if the motor 174 is reversed the counter weight 190 is moved downwardly and the carrier 160 is moved upwardly . each of the arms 162 and 164 are secured to one of the rail - like members 170 and 172 at a position spaced from the top cross member 166 by brackets 171 and 173 . each of the arms includes a stationary section such as 192 and a telescoping section such as 194 . the telescoping section rides on a i - beam like rail 196 as seen in fig2 . on each telescoping section such as 194 a hanger supporting saddle such as 198 or 199 is mounted . the carrier motor 200 and carrier drive shafts 202 and 204 cause the carrier chains 210 and 212 to rotate to cause the telescoping sections of the arms to move inwardly or outwardly as seen in fig2 . it will be noted that the carrier cross member 166 is spaced above the connection of the arm to the carrier so as to permit the saddle 198 to move thereunder . moreover , the entire carrier is sized so as to permit clearance of a work piece suspended from saddles such as 198 and 199 . the carrier chain 212 is connected to the telescoping section 194 by a pinion 213 and rack 214 which cooperate to cause the arm to move laterally inwardly and outwardly . the saddle 198 is connected to one end of the telescoping section cable 216 . the cable 216 is trained about the idler 218 and secured to the telescoping section at an end 220 . the saddle 198 is also connected to a second telescoping section cable 222 which is trained about a idler 224 and connected to the telescoping section at end 226 . thus as the arm moves from one side of the carrier to the other side of the carrier it will be seen that the saddle will move relative to the telescoping section 194 and from one side of the carrier to the other side of the carrier 160 . this is seen in fig2 where the stationary arm 192 and the telescoping arm 194 are shown . in this situation a saddle such as 198 is shown supporting a hanger such as 226 and work piece such as 228 . it will be appreciated that the telescoping section 194 of the arm as well as the hanger 226 and work piece 228 is moved from one side of the post 152 and carrier 160 to the other side ( i . e . left to right or vise versa ). it is seen that in fig2 the arm can be moved to a lower position or raised to an upper position and the saddle 198 , hanger 226 and work piece 228 can move accordingly . in operation an untreated work piece is delivered on a remote conveyor 20 so that a lift mechanism such as 18 can position a telescoping section such as 194 and hanger receiving saddles such as 198 and 199 under the hanger for the work piece and thus remove the work piece from the remote conveyor . the hanger rests on the saddles and the section is retracted under the action of the drive motor 200 . the telescoping sections of the arms are moved to the other side of the lift and in position to be delivered to the treatment conveyor line such as 12 . there the hanger and work piece are deposited on the hanger engaging bracket such as 34 associated with the beam 22 and the untreated pieces are added to the conveyor and moved as shown in fig3 , 7 , 10 and 11 . the hoist and travel mechanisms 24 and 26 cause the untreated piece to move into and out of the various treatment tanks and to the exit end of the lower line . at the exit end of the lower line 26 a lift mechanism 14 is provided and arms on the lift mechanism are extended and engage the hanger on the appropriate saddles . the arm is then retracted and lifted to the second line such as 16 . there the arms extend and the hanger is deposited on the line 16 . the treated piece is moved along the second or drying line to its exit end . there the lift mechanism 18 extends the arms and engages the hanger using the saddles . the arms are retracted , moved to a lower position , and caused to move to the other side of the lift mechanism and the hanger and work piece are deposited on the remote conveyor 20 . the cycle is then repeated . it will be appreciated the appropriate controls are provided for the operation of the system . numerous changes can be made to the embodiment disclosed herein without departing from the spirit and scope of this invention .