. The pivotably coupled links 434 and 436 and arms 430 and 432 form linkages 433 that function to pivot the door 221 about the hinged connection 230 to move the door 221 between the open and closed positions. Although two linkages 433 are shown, in other implementations, additional or fewer linkages 433 could be used. In the illustrated example, the hinged connections 230 are shown as a plurality of hinges. In some instances, the hinged connections 230 may be a single continuous hinge. Other types of pivoting connections are also contemplated.

The shaft 426 is coupled to the shaft 408 by a link 438. The link 438 is coupled to an arm 440 of the shaft 408 and an arm 442 of the shaft 426. The link 438 and arms 440 and 442 form a linkage 443 that operates to cause the shaft 426 to pivot about an axis 444 in response to rotation of the shaft 408. Thus, actuation of the actuator 402 operates to pivot the shafts 408 and 426 simultaneously about respective axes 416, 444 to open and close the doors 220 and 221. In other implementations, more than one actuator is used. For example, each door 220 and 221 has an associated actuator or actuators to independently move the respective door 220 or 221 between the open position and the closed position.

Although one example of an actuation system is described, other types of actuation system may be used to reposition the doors, such as between the open and closed positions, and are within the scope of the present disclosure.

FIGS. 5 and 6 are front, detail views of the grain cart 200 showing movement of the door 200 between the open and closed positions. FIG. 5 shows the door 200 in the open position with the arms 418 and 420 having pivoted in the direction of arrow 500. FIG. 6 shows the door in the closed position with the arms 418 and 420 having pivoted in the direction of arrow 600.

FIG. 7 is another example grain cart 700 that is similar to the grain cart 200, described earlier. Like the grain cart 200, the grain cart 700 includes a bin 702 having two doors 704 and 706 that are movable between a closed position and an open position in which openings 708 and 710 (indicated by dashed lines) are exposed. From the closed position, the doors 704 and 706 move in the directions of arrow 701 and 703, respectively, to the open position. From the open position, the doors 704 and 706 move in a direction opposite the arrows 701 and 703, respectively, to the closed position.

The grain cart 700 varies from that shown in FIG. 4 in that the grain cart 700 includes an actuation system 712 similar to the actuation system 400, described earlier, except that components of the actuation system 712 is located inside of a cavity 713 formed by the bin 702. Thus, the actuation system 712 used to move the doors 704 and 706 between the open and closed positions is located inside of a cavity 713 formed by bin 702.

Similar to the actuation system 400, the actuation system 712 includes shafts 714 and 716 that are coupled to doors 704 and 706, respectively, via linkages 718 and 720. The linkages 718 and 720 are similar to linkages 425 and 433, described earlier. The shafts 714 and 716 are connected by a linkage 722, similar to linkage 443. An actuator 724, such as a linear actuator or a rotary actuator, is used to pivot the shafts 714 and 716 to move the doors 704 and 706 between the open and closed positions. The actuator 724 may be similar to actuator 402. In the illustrated example, a single actuator, actuator 724, is used to move the doors 704 and 706 simultaneously between the open position and the closed position. In other implementations, more than one actuator is used, such as one actuator to move each of the doors 704 and 706 between the open and closed positions. Further, the actuator 724 is shown located inside of the cavity 713 coupled to a mount 715 that is coupled to an interior surface 730 of wall 728. In other implementations, the actuator 724 is coupled to wall 732, such as an interior surface 734 of the wall 732. In other implementations, the actuator 724 is located external to the cavity 713. Further, the actuator 724 may be located in or adjacent another component of the grain cart 700. The grain cart 700 also includes a seal 726 similar to the seal 234. In some implementations, the seal 726 is omitted. Although an example actuation system 712 is described, other types of actuation systems may also be used to move the doors 704 and 706 between the open position and the closed position.

FIGS. 8 and 9 are detail views of another example grain cart 800 that is similar to grain cart 700. The grain cart 800 varies in that the grain cart 800 includes an actuator 802 located outside of cavity 804 formed by a bin 805 of the grain cart 800. The actuator 802 is disposed adjacent to an exterior surface 806 and is coupled to and actuates an actuation system 808 that is similar to the actuation system 712 located inside of the cavity 804.

A shaft 810 of the actuation system 808 extends through wall 812 and is coupled to the actuator 802 via an arm 814 extending from the shaft 810. In the illustrated example, with the actuator 802 in the extended position, doors 816 and 818 are in the closed position, as shown in FIG. 8. In response to retraction of the actuator 802, the doors 816 and 818 pivot about hinged connections 820 to move the doors 816 and 818 into the open position, as shown in FIG. 9. In other implementations, the actuator 802 is arranged such that the doors 816 and 818 are maintained in the closed position when the actuator 802 is retracted, and the doors 816 and 818 are moved to the open position when the actuator 802 is extended. Other arrangements are also possible. Further, the example actuator 802 is a linear actuator, such as a hydraulic, pneumatic, or electric linear actuator. However, actuator within the scope of the present disclosure include rotary actuators. The grain cart 800 also includes a seal 822 similar to seal 726 and 234. In other implementations, the seal 822 is omitted.

FIGS. 10 and 11 illustrate another example grain cart 1000 that has sliding doors 1002, 1004 movable between an open position and a closed position. The grain cart 1000 is similar to the grain carts 200 and 700 and includes a bin 1001 defining a cavity 1003. However, the doors 1002 and 1004 of the grain cart 1000 are slideable between an open position and a closed position. For example, in some instances, the doors 1002 and 1004 slide generally vertically while remaining adjacent to the walls 1006 and 1008, respectively, of the bin 1001 of the grain cart 1000. For example, in the illustrated example, the walls 1006 and 1008 are sloped. Thus, in some implementations, the doors 1002 and 1004 slide along the exterior surfaces of the walls 1006 and 1008 in a generally vertically direction. That is, although the doors 1002, 1004 move in an angled direction as the doors 1002 and 1004 slide along the exterior surfaces of the walls 1006 and 1008, the direction of movement includes a vertical component. The doors 1002 and 1004 ride is tracks, rails, grooves, or slots (collectively referred to as “tracks” 1012) formed into or included on the walls 1006 and 1008.

The doors 1002 and 1004 move in response to actuation of actuators 1014 and 1016, respectively. Referring to FIG. 10, with the actuators 1014 and 1016 in a retracted configuration, the doors 1002 and 1004 are in a lower, open position, exposing openings 1018 and 1020 (identified by dashed lines), formed in walls 1006 and 1008, respectively. The actuators 1014 and 1016 may act simultaneously to raise (movement in the direction of arrows 1005) or lower (movement in the direction of arrows 1007) the doors 1002 and 1004 together or separately to raise or lower the doors 1002 and 1004 individually. In the illustrated example, the actuators 1014 and 1016 are linear actuators, such as electrical, hydraulic, or pneumatic linear actuators. In other implementations, other types of actuators can be used, such as rotary actuators, to move the doors 1002 and 1004 between the open and closed positions. Although shown exterior of the cavity 1003, in other implementations, the actuators 1014 and 1016 can be located interior of the cavity 1003 or within the respective walls or another component of the grain cart 1000.

FIGS. 12 and 13 illustrate another example grain cart 1200 including a bin 1202 that defines a cavity 1204. The grain cart 1200 is similar to grain carts 200, 700, 800, and 1000. Here, though, the grain cart 1200 includes doors 1206 and 1208 that slide horizontally to move the doors 1206 and 1208 between an open position and a closed position to expose openings 1210 and 1212, indicated by dashed lines. The doors 1206 and 1208 slide along walls 1214 and 1216, respectively, between the open and closed positions. The doors 1206 and 1208 slide within tracks, rails, grooves, or slots (collectively referred to as “tracks” 1220) formed into or included on the walls 1214 and 1216.

The doors 1206 and 1208 are movable in response to actuation of actuators 1222 and 1224, respectively. The actuators 1222 and 1224 may act simultaneously to open (movement in the direction of arrows 1225) or close (movement in the direction of arrows 1227) the doors 1206 and 1208 together or separately to open or close the doors 1206 and 1208 individually. In some implementations, the actuators 1222 and 1224 are linear actuators, such as electric, hydraulic, or pneumatic linear actuators. In other implementations, other types of actuators can be used, such as rotary actuators. In some instances, rotary actuators may include couplings such as a rack and pinion coupling, a ball screw coupling, a friction roller coupling, or a cable and pulley coupling. FIG. 12 shows the doors 1206 and 1208 in the open position, exposing the openings 1210 and 1212, and FIG. 13 shows the doors in the closed position, concealing the openings 1210 and 1212. Although shown exterior of the cavity 1204, in other implementations, the actuators 1222 and 1224 can be located interior of the cavity 1204 or within the respective walls 1214 and 1216 or another component of the grain cart 1200.

FIGS. 14 and 15 illustrate another example grain cart 1400 having a bin 1402 that defines a cavity 1404. The grain cart 1400 is similar to grain carts 200, 700, 800, 1000, and 1200 except that the grain cart 1400 includes doors 1406 and 1408 that can be furled into a roll to place the doors 1406 and 1408 into an open position. In the open position, the doors 1406 and 1408 expose openings 1410 and 1412 (illustrated in dashed lines). In the closed position, the doors 1406 and 1408 conceal the openings 1410 and 1412. The doors 1406 and 1408 are movable along tracks, rails, grooves, or slots (collectively referred to as “tracks” 1414) formed into or included on the walls 1416 and 1418. In some instances, the doors 1406 and 1408 have flexibility in one direction about axes 1420 and 1422, respectively, such that the doors 1406 and 1408 can be furled or rolled up. However, in some instances, the doors 1406 and 1408 have reduced flexibility in another direction, such as about being flexible about axes 1428 and 1430.

The doors 1406 and 1408 are movable between the open position (shown in FIG. 14) and the closed position (shown in FIG. 15) in response to operation of an actuator assemblies 1432 and 1434, respectively. In the illustrated example, the actuator assemblies 1432 and 1434 include an actuator 1436 and a housing 1438. The doors 1406 and 1408 can be rolled up about the axes 1420 and 1422, respectively, in housings 1424 and 1426, respectively. In some implementations, the doors 1406 and 1408 are furled on a shaft disposed within the respective housings 1424 and 1426.

Actuators 1436 operate to extend or retract the doors 1406 and 1408 along the tracks 1414. The actuators 1436 move the doors 1406 and 1408 in the direction of arrows 1440 and 1442, respectively, when moving the doors 1406 and 1408 into the open position. Similarly, the actuators 1436 move the doors 1406 and 1408 in the direction of arrows 1444 and 1446, respectively, when moving the doors 1406 and 1408 into the closed position. In some implementations, when the doors 1406 and 1408 are unfurled into the extended or closed position, the doors 1406 and 1408 conform to a shape of corresponding walls 1416 and 1418. For example, when extended into the closed position, the doors 1406 and 1408 may form an extension of surfaces of the walls 1416 and 1418, respectively. In some implementations, the actuators 1436 are rotary actuators, such as electric, hydraulic, or pneumatic rotary actuators. However, in other implementations, other types of actuators may be used. Although shown exterior of the cavity