Patent ID: 6257625
Filing Date: 2001-07-10
Classification: F16L

Abstract:
A flexible joint comprising:first cylindrical bodies comprising a pair of spherical ring members each formed with a partially spherical outer peripheral surface;a second cylindrical body comprising a sleeve relatively movablly inserted in said first cylindrical bodies from an axial direction X of said second cylindrical body;third cylindrical bodies comprising a pair of casing tubes which are fitted around outer peripheral surfaces of said first cylindrical bodies and are provided with mutually slidable spherical inner peripheral surfaces, said casings being formed at their opposite ends with connecting portions, and being provided at their outer peripheral surfaces of large diameter portions with projections having through holes; androds capable of being inserted into said through holes formed in said outer peripheral surfaces of said large diameter portions, each of said rods being provided and fixe between said projections of said pair of third cylindrical bodies for restricting the telescopic movement of said tube joint, whereinsaid rods comprise a pair of rods connected to each other in the vicinity of a substantially central portion between said opposed projections, said pair of rods being threadedly connected to at least one of bottom holes opened and formed on opposite ends of a long nut which is provided at its substantially central portion with a notched portion so that when excessive external force is applied, said notched portion is preferentially broken to restore telescopic flexible effect of said tube joint, wherein a protecting sleeve is fitted over the outside of said long nut.