| 摘要 |
An elongated brace member is attached adjacent its inner end pivotally to a base member clamped to the outer circumference of a wheel, a plurality of which support through their hubs an elongated assembly of interconnected irrigation pipes. The inner end of the brace member is connected to the base member through an extensible and retractable damper cylinder which functions to delay the pivotal movement of the brace member from a retracted, inoperative position in which it extends substantially parallel to the irrigation pipe line, to an extended, operative position in which it projects angularly outward and downward from the wheel into engagement of its outer end with the ground. In an alternate construction the base member is secured to the outer end of an elongated post which extends radially outward from the irrigation pipe.
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