US 5,330,290 A · Levee gate and process for the production thereof

Abstract

A levee gate and the process for the production thereof. The levee gate of the invention includes a rectangular sheet of thermoplastic material with a rectangular sleeve located on one edge of the thermoplastic material, the rectangular sleeve being a portion of the rectangular sheet fused to the rectangular sheet. The process for the production of the levee gate includes extruding a cylindrical tube of thermoplastic material, inflating the cylindrical tube as it is extruded to provide an inflated length of tube, flattening the inflated length of tube without fusing the opposed walls of the tube to each other, and continuously fusing a portion of the opposed walls together to form a seam.

Claims14

Dependent claims

A product produced by the process comprising:

a. extruding a cylindrical tube of thermoplastic material,
b. inflating said cylindrical tube as it is extruded to provide an inflated length of said cylindrical tube,
c. flattening the inflated length of tube without fusing opposed walls of said tube to each other to form two opposed rectangular sheets,
d. continuously fusing a portion of the opposed walls of said two rectangular sheets together, said portion which is fused forming a seam, said seam forming a sleeve along one edge of said two rectangular sheets, and
e. continuously perforating a plurality of holes in one of said rectangular sheets.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/020,199Filed 19 Feb 1993 · division

Priority

9 Mar 1992

Granted

19 Jul 1994

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

B29C 65/02
Joining or sealing of preformed parts , e.g. welding of plastics materials; Apparatus therefor: by heating, with or without pressure
B29C 48/10
Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels: flexible, e.g. blown foils
B29C 65/10
By heating, with or without pressure: using hot gases or flames coming in contact with at least one of the parts to be joined
B29C 65/74
Joining or sealing of preformed parts , e.g. welding of plastics materials; Apparatus therefor: by welding and severing , or by joining and…

Levee gate and process for the production thereof

Life of this patent

Levee gate and process for the production thereof

Life of this patent

Abstract

Claims14