| 摘要 |
PURPOSE: A mast head is provided to make more safe use thereof possible and to enable only an administrator to adjust the tension of a rope. CONSTITUTION: A mast head comprises: a body(210) in which an installation hole is vertically formed in the central part thereof; a moving body(220) which is inserted into the installation hole and in which a connecting part for connecting a rope is formed in the top end thereof; and an adjusting unit(230) capable of up and down movement of the moving body against the body in order to adjust the tension actuating on a plurality of ropes. In the installation hole of the body, a key groove is formed. In the outside of the moving body, a projected key is equipped. |
