Fitting for liquid tight flexible metal conduit
AssigneeGeneral Signal Corporation
InventorWalter W. Bachle
Life of this patent
Estimating the term…
Abstract
A liquid tight fitting for liquid tight flexible metal conduit which provides higher unit sealing pressures and improved liquid tight sealing by providing line, rather than surface, contact at critical points. The body member of the fitting makes line contact with a flared lip of the ferrule. The lip of the ferrule makes line contact with the sealing ring. The vector forces which create the seals have components in the directions required to most effectively and efficiently produce the seals. The sealing ring may be made symmetrical, is discontinuous, has an inside bead for sealing against the conduit and may include wings for retention in the gland nut prior to assembly of the fitting on a conduit end.
Claims27
A fitting for making a liquid tight connection to a liquid tight flexible metal conduit and comprising in combination elements assembled on the conduit in the sequence named:
- (a) a gland nut having internal threads, a shoulder and a throat portion;
- (b) a discontinuous sealing ring having first and second ends and first, second and third surfaces;
- (c) a ferrule having a cylindrical wall encasing the end of a conduit inserted therein and with said cylindrical wall terminating in a flared portion the end of which contacts said first surface of said sealing ring for making a line sealing contact;
- (d) a body member including threads mating with those of said gland nut and including a portion contacting said flared portion of said ferrule for making a line sealing contact therewith;
- (e) said second surface of said sealing ring making line contact with said shoulder portion of said gland nut in response to the engagement of the threads of said gland nut with the mating threads of said body member;
- (f) said third surface of said sealing ring making sealing contact with the conduit in response to the engagement of the threads of said gland nut with the mating threads of said body member;
- and wherein
- (g) the forces applied to said first and second surfaces by the contacting part of said ferrule and said shoulder, respectively, include components for urging the ends of said discontinuous sealing ring into sealing contact.
Dependencies are inferred from the claim text.