| 摘要 |
A steering apparatus (10) turns steerable wheels (14, 16) of a vehicle (12) having first (14) and second (16) sets of steerable wheels. The steering apparatus (10) includes first and second steering assemblies and a braking mechanism (200). The first steering assembly is actuatable to effect turning of the first set (14) of steerable wheels. The second steering assembly is actuatable to effect turning of the second set (16) of steerable wheels. The braking mechanism (200) locks the second set of steerable wheels (16) in position in response to a failure of the second steering assembly.
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