| 摘要 |
<p>The tubular frame base (1) has diametral perforations (3,4,5) at its top and a small chain (6) holding the locking pin (7), while along the base slides a collar (17) with a blocking screw (18), and support bracket (16). The smaller diameter top tube (8) has orifices (9,10) at regular intervals (11,12) while its top end takes a threaded (13), extension bolt (14) which has a recovery screw (15) on its head. A collar (26) slides on this tube and has a stop screw (27) and orifices (28) that support a perpendicular bar (20) which has threaded orifices (21,22,23,24) and a grip screw (25).</p> |
