| 摘要 |
<p>Lift bridge (1) includes two hollow columns (2) of steel plate, and of C-profile. Each column (2) is welded to base plate (11) in turn secured by bolts (12) to the floor. Inside each column fit a vertical movable carriage (3) which at top and bottom has guide wheels (5,6). Bottom of each carriage has a support (7) protruding from column (2) and having two support arms (8) which are pivotal. Pivot bearings (10) have a stop mechanism to secure arms (9) in required position. Lifting mechanism includes hydraulic jack (14) of which cylinder (15) is fixed to carriage (3). Piston rod (16) is connected to column (2).</p> |
