| 摘要 |
PROBLEM TO BE SOLVED: To correct the wrong coupling that is caused frequently when coupled under the state that a center axial lines of a pair of couplers are not aligned. SOLUTION: The coupler is provided with a protruded engaging part 10 which is provided in a main body 1 at on side in a protect arm 1a and a knuckle 2 and an engaged part 20 which is provided in the main body 1 at the other side in the protect arm 1a and the knuckle 2 and forms a receiving space 21. When a pair of couplers are connected under the state that a center axial lines are not aligned viewed on the plane, the protruded engaging part 10 of one coupler enters into the receiving space 21 of the engaged part 20 of other coupler. At least one of an inside plane 23 and an outside plane 24 dividing the receiving space 21 engages with the protruded engaging part 10. The main body 1 oscillates so that crossing anglesα1,α2 made by a base line O connecting both end part 1b of a pair of couplers and the center axial line of each coupler decrease. Then, the knuckle 2 and protect arm 1a jointly receive the knuckle 2 of the coupler of the other side.
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