Pipe coupling

摘要

A coupling (10) for receiving and retaining the end of a conduit. The coupling (10) includes a leading body part (12), a grab ring (14), a sealing ring (16), a trailing body part (18) and a sleeve (11). The trailing body part (18) has an outer surface portion (46) which is inclined to diverge outwardly and a rear face (20) that extends from a trailing end of the outer surface (46), and that faces axially. The sleeve (11) extends circumferentially around the leading body part (12), the grab ring (14), the sealing ring (16) and the trailing body part (18). The sleeve (11) includes a forward end (24) for engaging the leading body part (12) a first axial portion (23) which extends from the forward end (24), an inclined portion (22) which extends from the axial portion (23) and which is inclined complimentary to the outer surface portion (46). The sleeve (11) further includes a trailing end portion (21) that extends from the inclined portion (22) to overlie the rear face (20) of the trailing body part (18) in close facing relationship. The sleeve (11) is operable to resist movement of the leading and trailing body parts (12, 18) axially away from each other.

主权项

1. A pipe coupling for coupling to an end of a conduit, said pipe coupling being arranged to receive the conduit end and to retain the conduit end relative to said pipe coupling, said pipe coupling comprising:
a trailing body part comprising a pipe segment terminating at a pipe proximal end, said pipe segment having a first diameter portion with an axial internal surface and an axial external surface, said pipe proximal end having a second diameter portion with an axial internal surface and an inclined external surface, said pipe proximal end having a radially disposed exterior surface between said external surface of said pipe segment and said external surface of said pipe proximal end, said pipe proximal end having a radially disposed interior surface between said internal surface of said pipe segment and said internal surface of said pipe proximal end, said second diameter portion being greater than said first diameter portion such that an annular cavity is formed within said pipe proximal end; an annular sealing ring mounted within said annular cavity adjacent said radially disposed interior surface for sealing against an outer surface of the conduit end; a leading body part comprising an annular member having an exterior surface, an interior surface, a proximal end, and a distal end in abutment with said pipe proximal end, said exterior surface of said leading body part comprising an axial surface and a curved shoulder surface, said interior surface of said leading body part comprising a first axial surface and a second axial surface, a first step surface and a second step surface, and an annular recess formed in said second axial surface; an intermediate ring comprising a proximal portion and a distal portion, said proximal portion mounted within said leading body part, said proximal portion including an annular projection for engaging said annular recess of said leading body part to secure said intermediate ring to said leading body part, said distal portion extending into said annular cavity of said trailing body part such that said sealing ring is mounted within said annular cavity between said distal portion of said intermediate ring and said radially disposed interior surface of said trailing body part; a grab ring for gripping the outer surface of the conduit end to restrain the conduit end against retraction out of said coupling, said grab ring mounted within said leading body part between said proximal portion of said intermediate ring and said second step surface; a demount ring comprising an angled surface and a shoulder mounted within said leading body part between said grab ring and said first step surface, said angled surface being operable to slidably engage said grab ring and thereby disengage said grab ring from the outer surface of the conduit end to allow removal of the conduit end from said coupling; and a sleeve having a proximal terminal segment overlying said curved shoulder surface of said exterior surface of said leading body part, an axial segment overlying said axial surface of said exterior surface of said leading body part, an inclined segment overlying said inclined external surface of said trailing body part, and a radially disposed distal terminal segment overlying said radially disposed exterior surface of said trailing body part, said sleeve being operable to maintain said leading body part in abutment with said trailing body part and thereby resist movement of said leading body part and said trailing body part axially away from each other; wherein said trailing body part, said sealing ring, said leading body part, said intermediate ring, said grab ring, and said demount ring are aligned axially in the direction of insertion of the conduit end into said coupling.