| 摘要 |
PURPOSE:To prevent a propelling unit from damage due to obstacles, such as driftwood, etc. by tightly fixing the lower end part of a pivot shaft to the lower arm with use of an engaging member. CONSTITUTION:The central part 4c of a support member 4 is inserted between an upper arm 3a and a lower arm 3b which are incorporatively protruded from the casing in front of a propelling unit 3, and the span between the both members 3, 4 is connected by a pivot shaft 7. And, the upper end part of the pivot shaft 7 is inserted to the upper arm 3a, the lower part is tucked to the lower arm 3b, and the tucked part is fixed with use of a pin 11. The pin 11 is inserted into a pin hole which is made from the direction of orthogonally crossing in the axial direction of the shaft 7, and the inserted side is closed by a screwed lid 12. On another hand, a washer 13 is fixed by a bolt 13b at the upper end of the pivot shaft 7. In consequence, the rigid joint structure is constituted by the casing main body of the propelling unit 3, the both upper and lower arms 3a, 3b and the pivot shaft 7. |
