Flexible duct

Details Flexible duct Flexible duct

F - Mech Eng,Light,Heat,Weapons

16

L

189/18

F16L 11/16 (2006.01) F16L 11/11 (2006.01)

Patent

CA 1052712

ABSTRACT The following specification disclose a flexible duct constructed from a spiral of channel-shaped metal with the legs of the channel facing inwards of the spiral. A strip of cloth or other flexible webbing material is formed into a spiral with its over- lapping edges folded into the channel of the spiral with a cord or string filling the remainder of the channel cavity before the channel legs are crimped together to maintain the webbing strips edges fast together within its grip. The expans- ibility of the duct is increased by increasing the width of strip of webbing.

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