Title:
【発明の名称】自在継手
Document Type and Number:
Japanese Patent JP3315281
Kind Code:
B2
Abstract:
PURPOSE: To prevent the occurrence of serious leakage during the occurrence of a fire and to provide reliable sealing ability in an ordinary working state. CONSTITUTION: A joint sleeve 20 is oscillatorily coupled to a coupling body 10 in a seal state through compression of seal packings 31 and 32. Even when the seal packings 31 and 32 are burnt out during the occurrence of a fire, since a thermal expansion packing 40 mounted in a recessed groove 15 is expanded to embed the outer surface of the protrusion spherical surface 21 of the joint sleeve 20, serious leakage does not occur. Further, since the thermal expansion packing 40 presses the maximum diameter part on a central axis of the protrusion spherical surface 21 toward the central side is moved to one of the right and the left on an axis to prevent the increase of the expansion space of the thermal expansion packing 40, and fire resisting performance by the thermal expansion packing 40 is ensured. This constitution ensures sealing ability of an oscillating coupling part between the coupling body 10 and the joint sleeve 20, and prevents leakage of fluid, such as city gas, flowing through the coupling.
Inventors:
Saito Morio
Katsuhiro Ohki
Hideo Nozaki
Katsuhiro Ohki
Hideo Nozaki
Application Number:
JP32109894A
Publication Date:
August 19, 2002
Filing Date:
December 26, 1994
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
Tokyo Gas Co., Ltd.
Tokyo Gas Co., Ltd.
International Classes:
F16L27/06; F16L27/12; (IPC1-7): F16L27/06
Domestic Patent References:
| JP58200891A | ||||
| JP5697684U | ||||
| JP5818179U | ||||
| JP5275920U |