| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a roof trestle having a structure which enables a stay wire to be tensed when an antenna is installed upright on the roof trestle, thereby reducing time and material for the installation. <P>SOLUTION: A roof trestle has a structure in which a mast pole holding cylinder (3) connected to a central cylindrical part (4) of a body of the roof trestle with using a screw is moved by screwing it to extend a mast pole (2) upwards, which enables a stay wire to be tensed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
