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An agricultural seeding machine, includes a seed hopper, a first frame member carrying a drive shaft, a second frame member carrying a driven shaft, a coupler, and a flexible shaft. The first frame member and the second frame member are foldable relative to each other between a folded position and a

An agricultural seeding machine, includes a seed hopper, a first frame member carrying a drive shaft, a second frame member carrying a driven shaft, a coupler, and a flexible shaft. The first frame member and the second frame member are foldable relative to each other between a folded position and an unfolded operational position. The coupler includes a first coupler half associated with the drive shaft, and a second coupler half associated with the driven shaft. The second coupler half and the first coupler half are configured for automatic engagement and disengagement upon movement between the folded position and the unfolded position respectively. The flexible shaft interconnects the first coupler half with the drive shaft or the second coupler half with the driven shaft.

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The invention claimed is: 1. An agricultural seeding machine, comprising: a seed hopper; a first frame member carrying a drive shaft, and a second frame member carrying a driven shaft, said first frame member and said second frame member being foldable relative to each other between a folded positi

The invention claimed is: 1. An agricultural seeding machine, comprising: a seed hopper; a first frame member carrying a drive shaft, and a second frame member carrying a driven shaft, said first frame member and said second frame member being foldable relative to each other between a folded position and an unfolded operational position; and a coupler, including: a first coupler half associated with said drive shaft; a second coupler half associated with said driven shaft, said second coupler half and said first coupler half being configured for automatic engagement and disengagement upon said movement between said folded position and said unfolded position respectively, said first coupler half being rotatable around a first axis and said second coupler half being rotatable around a second axis, said first coupler half including a plurality of hooks extending generally radially relative to said first axis, and said second coupler including a plurality of pins extending generally axially relative to said second axis; and a flexible shaft interconnecting one of said first coupler half and said second coupler half with a corresponding one of said drive shaft and said driven shaft. 2. The agricultural seeding machine of claim 1, wherein said first coupler half includes a first transverse plate carrying said plurality of hooks, and said second coupler half includes a second transverse plate carrying said plurality of pins. 3. The agricultural seeding machine of claim 2, wherein said plurality of hooks comprises two hooks and said plurality of pins comprises two pins. 4. The agricultural seeding machine of claim 1, wherein said flexible shaft interconnects said second coupler half and said driven shaft. 5. The agricultural seeding machine of claim 4, wherein said flexible shaft is deflectable in a generally radial direction relative to said driven shaft. 6. The agricultural seeding machine of claim 1, wherein said second frame member is generally vertically angularly movable relative to said first frame member when in said unfolded position. 7. The agricultural seeding machine of claim 6, wherein said flexible shaft flexes through said vertically angular movement. 8. An agricultural seeding machine, comprising: a seed hopper; a first frame member carrying a drive shaft, and a second frame member carrying a driven shaft, said first frame member and said second frame member being foldable relative to each other between a folded position and an unfolded operational position; and a coupler, including: a first coupler half associated with said drive shaft; a second coupler half associated with said driven shaft, said second coupler half and said first coupler half being configured for automatic engagement and disengagement upon said movement between said folded position and said unfolded position respectively, said first coupler half is rotatable around a first axis and said second coupler half is rotatable around a second axis, said first coupler half including one of a plurality of hooks extending generally radially relative to said first axis and a plurality of pins extending generally axially relative to said first axis, and said second coupler half including a mating one of a plurality of hooks extending generally radially relative to said second axis and a plurality of pins extending generally axially relative to said second axis; and a flexible shaft interconnecting one of said first coupler half and said second coupler half with a corresponding one of said drive shaft and said driven shaft. 9. A coupling for an agricultural seeding machine for coupling together a drive shaft and a driven shaft, the drive shaft being carried by a first frame member and the driven shaft being carried by a second frame member, the first frame member and the second frame member being foldable relative to each other between a folded position and an unfolded operational position, said coupling comprising: a first coupler half associated with said drive shaft; a second coupler half associated with said driven shaft, said second coupler half and said first coupler half being configured for automatic engagement and disengagement upon the movement between the folded position and the unfolded position respectively, said first coupler half being rotatable around a first axis and said second coupler half being rotatable around a second axis, said first coupler half including a plurality of hooks extending generally radially relative to said first axis, and said second coupler including a plurality of pins extending generally axially relative to said second axis; and a flexible shaft interconnecting one of said first coupler half and said second coupler half with a corresponding one of said drive shaft and said driven shaft. 10. The coupling for an agricultural seeding machine of claim 9, wherein said first coupler half includes a first transverse plate carrying said plurality of hooks, and said second coupler half includes a second transverse plate carrying said plurality of pins. 11. The coupling for an agricultural seeding machine of claim 10, wherein said plurality of hooks comprises two hooks and said plurality of pins comprises two pins. 12. The coupling for an agricultural seeding machine of claim 9, wherein said flexible shaft interconnects said second coupler half and said driven shaft. 13. The coupling for an agricultural seeding machine of claim 12, wherein said flexible shaft is deflectable in a generally radial direction relative to said driven shaft. 14. The coupling for an agricultural seeding machine of claim 9, wherein said second frame member is generally vertically angularly movable relative to said first frame member when in said unfolded position. 15. The coupling for an agricultural seeding machine of claim 14, wherein said flexible shaft flexes through said vertically angular movement. 16. A coupling for an agricultural seeding machine for coupling together a drive shaft and a driven shaft, the drive shaft being carried by a first frame member and the driven shaft being carried by a second frame member, the first frame member and the second frame member being foldable relative to each other between a folded position and an unfolded operational position, said coupling comprising: a first coupler half associated with said drive shaft; a second coupler half associated with said driven shaft, said second coupler half and said first coupler half being configured for automatic engagement and disengagement upon the movement between the folded position and the unfolded position respectively, said first coupler half is rotatable around a first axis and said second coupler half is rotatable around a second axis, said first coupler half including one of a plurality of hooks extending generally radially relative to said first axis and a plurality of pins extending generally axially relative to said first axis, and said second coupler half including a mating one of a plurality of hooks extending generally radially relative to said second axis and a plurality of pins extending generally axially relative to said second axis; and a flexible shaft interconnecting one of said first coupler half and said second coupler half with a corresponding one of said drive shaft and said driven shaft. 17. A method of operating an agricultural seeding machine, comprising the steps of: providing a first frame member carrying a drive shaft, and a second frame member carrying a driven shaft; providing a coupler, including: a first coupler half associated with said drive shaft; a second coupler half associated with said driven shaft; and a flexible shaft interconnecting one of said first coupler half and said second coupler half with a corresponding one of said drive shaft and said driven shaft; unfolding said first frame member and said second frame member to an unfolded operational position; deflecting said flexible shaft when said first frame member and said second frame member are at said unfolded operational position; and automatically engaging a plurality of hooks extending from said first coupler half with a plurality of mating pins extending from said second coupler half 18. The method of operating an agricultural seeding machine of claim 17, including the further steps of: folding said first frame member and said second frame member; and automatically disengaging said first coupler half and said second coupler half upon commencement of said folding step. 19. The method of operating an agricultural seeding machine of claim 17, wherein said plurality of hooks extend generally radially relative to said drive shaft, and said plurality of pins extend generally axially relative to said driven shaft; and including the steps of rotating said drive shaft, and hooking said plurality of pins with said plurality of hooks. 20. The method of operating an agricultural seeding machine of claim 17, including the steps of: moving said second frame member through a generally vertically angular motion relative to said first frame member when in said unfolded position; and flexing said flexible shaft through said vertically angular motion.