| 摘要 |
An improved jack for horizontally extending trailer tongue including a bracket attached to the trailer tongue, a longitudinal shaft pivotally supported to the bracket and pivotal between a substantially vertical position and a substantially horizontal position, a wheel housing supported at a lower end of the shaft, a wheel rotatably supported by the housing, a lower portion of the shaft being rotatable about a shaft longitudinal axis, a crank arm rotatably extending from said wheel housing and having a drive gear thereon, and a driven gear affixed to the wheel, the driven gear being coupled for rotation when the drive gear is rotated to cause the wheel to rotate for moving the trailer when the wheel is in contact with the earth's surface.
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