| 摘要 |
PROBLEM TO BE SOLVED: To provide an unloader comprising a dog clutch which is engaged to link and connect screw shafts when a tip part is extended and moved while having a structure to fold and house a horizontal auger. SOLUTION: A horizontal auger consists of a base side part 12a and a foldable tip side part 12b. A dog clutch 16 is constituted in such a way that an engaging part 16a at the tip of a base side screw shaft 14 is meshed with an engaging part 16b at the base end of a tip side screw shaft 15 in an action state to make the horizontal auger into a straight line so as to link and rotate both the screw shafts 14 and 15 and in a folded and housed state, the parts are separated and the meshing is disengaged. A rotation controlling means D for making the rotation of the tip side screw shaft 15 impossible with the folding and movement of the tip side part 12b and permitting the rotation of the tip side screw shaft 15 with the advance movement of the tip side part 12b is installed.
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