| 摘要 |
PROBLEM TO BE SOLVED: To provide a manhole connector connecting an upper cylindrical body and a lower cylindrical body by screwing a fastening nut to a bolt with a predetermined torque. SOLUTION: This manhole connector A includes: a manhole cylindrical body 3 provided with a lower arm part 31 where a bolt passing hole 32 is bored at the lower part; a manhole cylindrical body 4 provided with an upper arm part 41 where a cylindrical nut is buried at the upper part; a rubber packing 60; a bolt 43, the tip part of which is screwed in the cylindrical nut; and a rubber washer 9 and the fastening nut 90 fitted to the rear end part of the bolt. When the fastening nut 90 is fastened with proper torque, a cylindrical part 91 of the rubber ring is increased in diameter to be equal to the diameters of the metal rings 95, 96, so that the cylindrical bodies can be connected to each other with proper force. COPYRIGHT: (C)2006,JPO&NCIPI
|
