US2011156387A1PendingUtilityA1

Duct and the manufacturing method

44
Assignee: SHINFUJI KUUCHOU CO LTDPriority: Nov 4, 2005Filed: Mar 9, 2011Published: Jun 30, 2011
Est. expiryNov 4, 2025(expired)· nominal 20-yr term from priority
Inventors:Toshikazu HasegawaIsamu Kajino
F16L 23/14F24F 13/0209F24F 13/0245
44
PatentIndex Score
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Claims

Abstract

A duct is provided which there is no need to attach any reinforcing material to. This duct has a hollow 5 formed by joining a plurality of flat wall plates 11 to 14 so that the interior surfaces of the wall plates 11 to 14 face each other. The duct is provided with four folded portions including a strip-shaped folded portion 11 C, 12 C formed by folding each wall plate 11 to 14 on the side of the exterior surface of each wall plate 11 to 14.

Claims

exact text as granted — not AI-modified
1 . A duct which has a hollow formed by joining a plurality of flat wall plates so that the interior surfaces of the wall plates face each other,
 wherein each of the wall plates includes a strip-shaped folded portion formed by folding each wall plate on the side of the exterior surface thereof and   wherein the folded portion is formed in the directions where the hollow is formed, or in the directions which intersect the directions where the hollow is formed.   
     
     
         2 . A duct which has a hollow formed by joining a plurality of flat wall plates so that the interior surfaces of the wall plates face each other,
 wherein each of the wall plates includes a strip-shaped folded portion formed by folding each wall plate on the side of the interior surface thereof, and   wherein the folded portion is formed in the directions where the hollow is formed, or in the directions which intersect the directions where the hollow is formed.   
     
     
         3 . The image formation apparatus according to  claim 2 , wherein in each of the wall plates which face each other, the folded portion is formed in the directions where the hollow is formed. 
     
     
         4 . The image formation apparatus according to  claim 3 , wherein a reinforcing member is provided which reinforces the wall plates by connecting each folded portion.

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