JPS644026Y2 - - Google Patents

Info

Publication number

JPS644026Y2

JPS644026Y2 JP7446582U JP7446582U JPS644026Y2 JP S644026 Y2 JPS644026 Y2 JP S644026Y2 JP 7446582 U JP7446582 U JP 7446582U JP 7446582 U JP7446582 U JP 7446582U JP S644026 Y2 JPS644026 Y2 JP S644026Y2

Authority

JP

Japan

Prior art keywords

casing

shutter

shaft

shutter plate

plate

Prior art date

1982-05-20

Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Links

• Espacenet
• Global Dossier
• Discuss

• 238000009423 ventilation Methods 0.000 claims description 9
• 238000003780 insertion Methods 0.000 claims description 5
• 230000037431 insertion Effects 0.000 claims description 4
• 230000000149 penetrating effect Effects 0.000 description 3
• 125000006850 spacer group Chemical group 0.000 description 2
• 239000004698 Polyethylene Substances 0.000 description 1
• 238000010276 construction Methods 0.000 description 1
• 238000004519 manufacturing process Methods 0.000 description 1
• 239000000463 material Substances 0.000 description 1
• 230000035515 penetration Effects 0.000 description 1
• -1 polyethylene Polymers 0.000 description 1
• 229920000573 polyethylene Polymers 0.000 description 1