Adjustable irrigation dam
OwnerKenneth Jarvisinventor
Life of this patent
Estimating the term…
Abstract
An adjustable portable irrigation dam for use in an irrigation ditch is operative to selectively raise the water level upstream of the dam thereby permitting removal of water for irrigation of crops. The dam includes an elongated sheet support member extending transversely across the irrigation ditch and being rotatably supported in members selectively positioned on opposite sides of said ditch to resist forces thereon so that rotation of said support member will selectively raise and lower one end portion of a sheet of a flexible material into and out of blocking relation to the irrigation ditch. Retaining mechanism is connected to the sheet support member for selectively retaining the support member and the flexible sheet in a selected position.
Claims8
An adjustable irrigation dam comprising:
- a. a sheet of flexible material capable of being positioned in transverse blocking relation to an irrigation ditch, said sheet having opposite end portions and a width greater than the width of such ditch whereby side margins overlie areas outwardly of said ditch;
- b. an elongated shaft member extending transversely across the irrigation ditch and having opposite end portions positioned laterally outwardly of the ditch;
- c. means connecting portions of side margins of said sheet and spaced apart portions at one of the opposite end portions thereof of said shaft member at points adjacent the sides of the ditch for permitting a mid portion between said portions of the side margins of said sheet to sag downwardly from said elongate shaft and permitting said sheet one end portion to be wound around said elongate shaft member upon rotation thereof to raise and lower said mid portion;
- d. anchor means selectively positioned on one side of and outwardly of the ditch and in engagement with one of the opposite end portions of said elongate shaft member for rotatably supporting same and retaining in a selected position relative to the ditch;
- e. a handle connected to said elongate shaft member adjacent said anchor means for rotating same to wind said portions the side margins of said sheet one end portion around said elongate shaft and vary the elevation of said mid portion of said sheet one end portion between said side margin portions connected thereto;
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- f. means on said handle and on said anchor means for selectively retaining said elongate shaft member against rotation and thereby position said mid portion of said sheet one end portion between said side margins at a selected elevated position.
An adjustable irrigation dam comprising:
- a. a sheet of flexible material capable of being positioned in transverse blocking relation to an irrigation ditch, said sheet having opposite end portions and a hem formed in one of said opposite end portions and having open opposite ends, said sheet having a width greater than the widthh of such ditch whereby side margins overlie areas laterally outwardly of said ditch;
- b. an elongated shaft member extending transversely across the irrigation ditch and having opposite end portions positioned laterally outwardly of the ditch;
- c. an elongated flexible member extending through said hem and beyond said hem opposite ends and having opposite end portions thereof each connected to respective spaced portions of said elongate shaft member adjacent sides of the ditch with a spacing less than the width of the sheet;
- d. anchor means selectively positioned at a side of the ditch and outwardly thereof and in engagement with at least one of the opposite end portions of said elongate shaft member for rotatably supporting same;
- e. a handle connected to said elongate shaft member for rotating same to wind said elongated flexible member end portions around said elongate shaft member and thereby wind spaced apart portions of said one end portion of said sheet around said elongate shaft member to vary the elevation of a mid portion between said spaced apart portions of said sheet one end portion;
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- f. ratchet means on said handle and on said anchor for selectively retaining said elongate shaft member against rotation and thereby position said mid portion between said spaced portions of said sheet one end portion at a selected elevated position, said ratchet means being releasable to allow said elongate shaft member to rotate and lower said mid portion of said sheet one end portion.
Dependencies are inferred from the claim text.