| 摘要 |
An improved jack for using leverage and the momentum of the vehicle or trailer to be lifted to raise the vehicle or trailer. The jack has a cradle to engage the axle of the vehicle or trailer to be lifted. The cradle is adapted to prevent the vehicle or trailer from slipping off the jack. The cradle is connected to a telescoping member which is inserted into a post that is connected to a based plate. The base plate is configured to allow the post and telescoping member to pivot to a vertical position as the vehicle or trailer is driver over the jack.
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