as shown in fig1 a toy train box car 10 is positioned on track 12 alongside a loading ramp 14 and platform 16 . a sliding door 18 along one side facing the ramp is in a closed position . fig2 shows the box car with the door 18 open , an attendant 20 holding and riding on the door and a load handler fig2 pushing a hand cart 24 , with a load 26 delivered onto the ramp 14 . fig2 ( a ) shows a simulated cold mist 27 which drifts out of the door when opened to give the appearance of a refrigerated box car . this is achieved with a few drops of smoke fluid inserted into a mist generator 28 shown in fig4 and 11 . as shown in fig3 and 4 in front and rear views , the outer shell of the car 10 with door 18 lifted and removed to expose the internal components in an initial inactive position with the door closed as in fig1 prior to actuating the door opening mechanism . as shown in fig1 , a push button control 29 connected to a power source , closes a microswitch and lever 30 to actuate a 3 volt , direct current motor 31 and gear reduction drive 32 , shown in fig4 which operate a pinion drive gear 34 and main drive gear 36 . a vertical pin 38 , shown more clearly in fig1 , projecting from gear 36 , engages a lateral slot 40 in an upper section of a shuttle structure 42 , shown further in fig7 and 12 . counterclockwise rotation the drive gear and pin moving down the slot from a starting central position drive the shuttle outwardly along a base plate 43 toward the other end . door 18 includes an inner projection , not shown , which engages a notch 44 in an upper side edge of the shuttle causing the door to slide open with the movement of the shuttle . fig4 shows the rear view of the components before activating the motor with the load handler 22 ready to push the hand cart 24 out of the door . the mist generator 28 and a light bulb 46 are connected to the voltage source to be actuated by the microswitch 30 in synchronism with the opening of door 18 . a horizontal portion 47 of the shuttle acts as a deflector to direct the mist downward and out of the door . a cargo storage bin 48 , shown in further detail in fig8 and 12 , holds the load items 26 to be released through a lower bin opening 49 onto the hand cart 24 after completion of an operating cycle to be ready for unloading and delivery onto the loading ramp 14 upon the next door opening . a pivotable rear door 50 encloses a portion of the cargo bin . in order to place the load items into the rear of the storage bin , the operator lowers the rear door and the items are vertically stacked in the bin by hand . as shown in fig7 and 12 , a shuttle index section 52 provides a base for the load items and moves along a trough 54 at the end of the bin . the closed rear door retains the cargo . each time the front delivery door 18 is opened , one load item moved during the previous closing cycle onto the hand cart by the shuttle index is pushed out onto the ramp 14 . as the index then moves away in the opening cycle another item drops into position for the next operation . the shuttle index 52 is guided on roller wheels 55 within trough 54 . a fastener 57 in the trough secures the cargo bin structure to the base 43 . fig5 is a front view of the internal components with the door 18 in a fully open position . drive gear 36 has moved halfway through a complete opening and closing cycle with pin 38 driving shuttle 42 to the far end . at this point load handler 22 has pushed the hand cart 24 with load 26 out of the open door 18 , as shown in fig2 ready to be unloaded onto ramp 14 . fig6 shows the rear view of these components and the load handler extending out of the opposite side opening . as shown in fig7 a , b and c , and fig1 , the movement of the hand cart 24 and load 26 are controlled by a rack 56 secured to an inner bottom wall section of shuttle 42 . a pinion gear arc 58 is positioned on the base 43 and meshes with rack 56 to move in synchronism with the shuttle . the inner end of the hand cart is connected by a link 60 to an inner end 62 of the pinion gear and moves outward in an arc as the shuttle advances the rack 56 and turns pinion 58 . an ejector arm 64 having a flat outer end positioned on the platform of the hand cart is pivotally linked at the other end to the inner end 62 of the pinion gear 58 and moves with the hand cart , as shown in fig1 ( b ). the final movement of the hand cart onto the loading ramp is limited by the position of the rack while the ejector arm continues to pivot beyond the end of the cart as in fig1 ( c ) to push the load off onto the ramp 14 . a tab or stop 66 secured on base 43 limits outer movement of the ejector arm . in the return cycle when the shuttle moves back to close the car door 18 , the rack 56 moves the pinion gear 58 in the opposite direction to return the ejector arm and hand cart to the original position as in fig1 ( a ). another fixed tab or stop 68 locks the ejector arm in that position until the next cycle of operation . the complete sequence of loading the load items 26 from the storage bin 48 onto the hand cart 24 is illustrated in fig9 a , b and c . in the initial inactive condition shown in 9 ( a ) with the car door 18 in a closed position , the load items 26 are stacked vertically in the bin 48 supported by the shuttle index section 52 . hand cart 24 holds a previously released item . upon actuation of the drive motor and gear to move the shuttle and open the door 18 as in 9 ( b ), the index section 52 moves away to release the lower load item 26 onto a bottom support area 70 while the hand cart 24 has moved the previous item out of the door . when the shuttle index and hand cart return during the door closing operation as in 9 ( c ), the index pushes the next load item onto the hand cart ready for the next cycle of operation . the entire sequence of operation of the various mechanisms can be described in connection with the components shown in fig1 in a mid cycle position with the door fully open . one complete cycle of operations is initiated by pressing push button 29 to close micro - switch and lever 30 which applies direct current to drive motor 31 . the motor operates a pinion drive gear 34 and main drive gear 36 . a vertical pin 38 projecting from gear 36 engages a lateral slot 40 in the closer end of the shuttle structure 42 which initially would be positioned over the pinion gear 34 prior to opening door 18 . counterclockwise rotation of the drive gear causes pin 38 to move downward from a center position in slot 40 which drives shuttle 42 in a linear direction outwardly toward the other end . this movement initiates the opening of door 18 and the operation of the cold mist generator 28 and bulb 46 . shuttle index 52 moves away to drop a load item 26 onto the bottom of cargo bin 48 , the hand cart 24 moves out of the open door with a previously loaded item as rack 56 drives pinion gear 58 . after one half cycle of a complete revolution of drive gear 36 , pin 38 will have traveled down to the end of slot 40 and then back up to the midpoint of the slot as shown in fig1 . door 18 is now in a fully open position as in fig2 and 5 with the shuttle having reached its limit of movement . at this point the ejector arm 64 will have pivoted outwardly to push the load off hand cart 24 onto loading ramp 14 . on the return half cycle of the complete counterclockwise revolution of drive gear 36 , pin 38 continues to travel up to the other end of slot 40 and then back down to the mid starting point . during this portion , the door 18 is closed , the hand cart 24 and ejector arm 64 are returned to their original starting positions , shuttle 42 moves back to its original position and shuttle index 52 pushes the next load item onto the hand cart for the next cycle of operation . finally the shuttle engages the microswitch and lever arm 30 to open the circuit to the power source and stop drive motor 31 . the mechanism thus operates unattended for one complete cycle of a 360 degree rotation of the drive gear with the system automatically shut down until another cycle is initiated by again pressing the push button control . as shown in various figures , the major component parts such as the outer car shell , the shuttle , the cargo bin and hand cart are readily removable manually and easily reassembled , with only one screw securing the cargo bin to the base plate . the drive motor and gearing are more permanently secured . while only a single embodiment has been illustrated and described , variations may be made in the particular components and mechanisms without departing from the scope of the invention as set forth in the appended claims .
a toy train box car includes an electrically operated miniature motor and gear drive which initially actuates a shuttle mechanism to open a sliding door and cause cargo items to be moved from a storage bin for loading onto a hand cart . as the door opens , a cold mist generator is energized to simulate cargo being unloaded from a refrigerated box car . the shuttle mechanism includes a rack and pinion which moves a figure pushing the hand cart out of the fully open door and an ejector arm offloads the cargo items onto an external loading ramp . the operating cycle then returns the hand cart into the car to receive another cargo item when the door is fully closed . the cycle is then completed and the motor inactivated until a new cycle is initiated .