| 摘要 |
<p>To prevent the skidding of the wheels of heavy vehicles on roads covered with patches of ice or with snow, there is provided a retractable arch device whose arches may be hydro-electrically brought from the cabin of the vehicle's driver to an active position or a retracted position. The device comprises a ring (4) arranged between the paired wheels (2, 3) of the vehicle. Said ring (4) carries five guiding spokes (9) having blind holes (12) wherein parts (13) of the arches (14) may slide. Five forks (10), arranged between the guiding spokes (9), carry double acting hydraulic jacks (20) which are oscillatingly mounted. The piston rods (22) of the hydraulic jacks (20) are connected by pairs of symmetric arms (23), trunnions (24) and links (25) to the ends of the two arches (14) following each other.</p> |
