High pressure field repair coupling

Claim 1

A hose coupling for attachment to and sealing of the terminal end of high pressure large bore hose of layered construction, such hose having an intermediate layer of heavy wire reeinforcement, and an inner and outer layer of elastomeric material, such coupling comprising: a tubular body portion having at its forward end means for attachment to a desired standard piping fitting, on its outer periphery an annular flange cooperative with a sealing ring and for abutment with a locking ring, a conical rearward facing tubular portion terminating in an abutment face; on its inner periphery a minor bore for acceptance and centering of a nipple portion, and a major bore for acceptance of an annular piston portion of the nipple, a nipple portion insertable into the hose end after removal of a length of the inner liner, having on its outer periphery a forward facing extension loosely fitting into the minor bore of said body, an annular piston and sealing ring cooperative with the major bore of said body, a heavy walled central portion having a plurality of grooves for the acceptance and retention of the hose wire layer, and a rearwardly facing extension having a sealing ring on its outer surface, of a diameter to be insertable into the elastomeric inner liner of the hose, a plurality of wedge segments, having an outer periphery with a conical surface for cooperation with a like conical surface said wedge segments having a inner periphery of a ferrule, on the forward face formed as a surface for abutting said abutment face of said tubular body portion for control of initial wedge position and for cooperation with a wedge driving ring; on the inner surface a plurality of annular teeth, so spaced as to be in axial register with the grooves of the said nipple, and a rear portion having means for depression of the hose wall radially inward against the seal ring of said nipple, a wedge driving ring cooperative between the rearward face of the said annular piston and the forward face of said wedge segments to insure uniform axial movement of said wedge segments in response to axial movement of said nipple, a ferrule portion having on its inner periphery a conical surface cooperative with said wedge segments to convert relative axial motion therebetween to a radially inward movement of said segments when said ferrule is moved over said annular flange to a lockring receiving position, thereby depressing said reinforcing wire layer into said grooves, and the hose wall against said seal ring of the nipple, and, fluid pressure acting on said annular piston moves said wedge driving ring and wedge segments relative to said ferrule position thereby additionally depressing said reinforcing wires into said grooves and hose wall more forcefully against said sealing ring, a seal groove containing a seal ring for sealing engagement with said annular flange and a second groove containing a lockring for locking said ferrule relative to said annular flange by abutment therewith and, on its outer periphery an annular shoulder for attachment of assembly tooling.