| 摘要 |
Disclosed are longitudinally slidable gates for the longitudinally extending outlet ports of arcuately walled irrigation pipes, the gates being of the general type wherein a gasketed inner-plate cooperates with and is longitudinally co-movable with an outer cover member slidably disposed at the pipe outside surface. The gate concept disclosed herein includes a boss attached to and extending radially outwardly from the inner-plate and longitudinally guided by the pipe water outlet port, the gate cover member being afforded vertically movable relationship to the inner-plate and resiliently urged theretoward and to the intervening pipe wall with disjointed separable spring means to accommodate the pipe wall given finite-thickness. Preferably, the boss includes a transverse bridge defining a boss longitudinal bore to accommodate therealong an inexpensive, reliable and rugged leaf spring, which might be desireably independently formed of reinforced resinous material. Further, novel inner-plate gaskets are disclosed which provide slidable water-tight seals of unusual reliability and which also compensate for a range of selectable pipe radii and encountered wall irregularity.
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