| 摘要 |
A trailer support assembly is moved from a retracted position to an extended position to support a front portion of a trailer once the trailer has been uncoupled from a tractor vehicle. The trailer support assembly includes a set of adjustable support legs that is mounted to a trailer structure and a drive transmission that moves the adjustable support legs between the retracted and extended positions. A ratchet mechanism drives the drive transmission when actuated by a crank handle. The ratchet mechanism includes a toothed wheel and a pawl that cooperate with each other to allow the crank handle to be manually rotated by an operator within a predefined area of maximum ergonomic advantage.
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