JPH0319821Y2 - - Google Patents

Info

Publication number

JPH0319821Y2

JPH0319821Y2 JP1984186090U JP18609084U JPH0319821Y2 JP H0319821 Y2 JPH0319821 Y2 JP H0319821Y2 JP 1984186090 U JP1984186090 U JP 1984186090U JP 18609084 U JP18609084 U JP 18609084U JP H0319821 Y2 JPH0319821 Y2 JP H0319821Y2

Authority

JP

Japan

Prior art keywords

screw member

curtain

diameter portion

closing

opening

Prior art date

1984-12-10

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

• 238000003780 insertion Methods 0.000 claims description 10
• 230000037431 insertion Effects 0.000 claims description 10
• 238000005452 bending Methods 0.000 description 2
• 238000004519 manufacturing process Methods 0.000 description 2
• 238000007796 conventional method Methods 0.000 description 1
• 238000005516 engineering process Methods 0.000 description 1
• 230000005484 gravity Effects 0.000 description 1
• 230000007257 malfunction Effects 0.000 description 1
• 238000000034 method Methods 0.000 description 1