Material unloader apparatus, systems and methods

1. A material unloader for receiving and conveying material from a vehicle, the material unloader having an operational configuration and a transport configuration, the material unloader comprising:

a conveyor extending in a generally longitudinal direction;

a ground frame, the ground frame having at least one opening therethrough, said opening being disposed at least partially above said conveyor;

a first ramp pivotally coupled to said ground frame and extending in a first lateral direction away from said ground frame in the operational configuration;

a first actuator configured to pivot the first ramp;

a second ramp pivotally coupled to said ground frame and extending in a second lateral direction away from said ground frame in the operational configuration, wherein said opening is disposed at least partially laterally between said first and second ramp;

a second actuator configured to pivot the second ramp;

a wheel assembly at least partially supporting the ground frame in the transport configuration; and

a truss supported on said ground frame and disposed at least partially above said ground frame, said truss configured to bear a compressive load in the transport configuration, wherein said first and second ramps are raised in the transport configuration, wherein at least a portion of said first and second ramps form a part of said truss in the transport configuration such that said first and second ramps bear at least a portion of said compressive load in the transport configuration.

2. The material unloader of claim 1 , further comprising:

a grate at least partially supported on said ground frame, wherein said opening extends through said grate.

3. The material unloader of claim 1 , further comprising:

a third ramp pivotally coupled to said ground frame;

a third actuator configured to pivot the third ramp;

a fourth ramp pivotally coupled to said ground frame; and

a fourth actuator configured to pivot the second ramp.

4. The material unloader of claim 1 , wherein said first ramp comprises a first support, wherein said second ramp comprises a second support, wherein said first and second support at least partially bear said compressive load in the transport configuration.

5. The material unloader of claim 4 , wherein said truss comprises first and second pockets receiving said first support in the transport configuration, and wherein said truss comprises third and fourth pockets receiving said second support in the transport configuration.

6. The material unloader of claim 4 , wherein a deflection of said truss in the transport configuration secures said first and second ramp in a raised position.

7. The material unloader of claim 6 , wherein in an undeflected condition of said truss the first and second ramps are freely pivoted from the raised position to a lowered position.

8. The material unloader of claim 4 , wherein said first and second supports comprise longitudinally extending beams.

9. The material unloader of claim 1 , wherein said truss comprises a rear section and a forward section, and wherein said first and second ramps at least partially transmit a load between said rear section and said forward section in the transport configuration.

10. The material unloader of claim 9 , wherein said truss further comprises a central section, and wherein said first and second ramps at least partially transmit a load between said central section and said rearward section in the transport configuration.

11. A method of transporting a material unloader, comprising:

supporting a first vehicle on a ramp in a lowered position;

folding said ramp upwards to a raised position;

forming a truss comprising a portion of said ramp;

supporting a rearward portion of the material unloader on a second vehicle;

supporting a forward portion of the material unloader on a wheel assembly;

bearing a compressive load on said portion of said ramp.

12. The method of claim 11 , further comprising:

deflecting said truss by said compressive load such that said portion of said ramp is secured to said truss.

13. A method of reconfiguring a material unloader from an operational configuration to a transport configuration, comprising:

moving a first ramp generally upwards to a raised position relative to a ground frame;

moving a second ramp generally upwards to a raised position relative to said ground frame;

joining said first and second ramps to a truss;

supporting said ground frame at least partially on a vehicle such that a compressive load is imposed on said truss; and

bearing at least part of said compressive load on a portion of said first ramp and a portion of said second ramp.

14. The method of claim 13 , further comprising:

deflecting said truss such that said portion of said ramp is secured to said truss.

15. The method of claim 13 , further comprising:

moving a third ramp generally upwards to a raised position relative to said ground frame;

moving a fourth ramp generally upwards to a raised position relative to said ground frame;

joining said third and fourth ramps to said truss; and

bearing at least part of said compressive load on a portion of said third ramp and a portion of said fourth ramp.