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Pipe Fittings On sanling-cn.com

The present invention relates to a pipe fitting comprising a cylindrical body, a radially deformable locking piece, a seal and a compression ring which is maintained fast with the body, while being free to slide axially with respect thereto. The ring defines with the body an annular space in which the seal and the locking piece are maintained fixed so that the fitting forms a unit.
1. A pipe fitting for securing a pipe having a smooth end to another part, said fitting comprising a hollow cylindrical body with an axially extending bore, said body having an axially forward end and an axially opposite rearward end and having means thereon at said forward end for securing it to said other part including means for forcing said body in the axial direction toward said other part, and a sealing member and a locking member within said bore, each said sealing member and said locking member having a central opening substantially equal in size to the outer size of said pipe for receiving and engaging said smooth end of said pipe, said sealing member being compressible and intermediate said forward and rearward ends for sealing said body to said pipe, said locking member being radially deformable by axial pressure thereon for locking said body on said pipe and being intermediate said forward and rearward ends, said body having an inwardly extending portion at the rearward end thereof engageable with one of said locking member and said sealing member for preventing rearward axial movement of said one member, said inwardly extending portion having a central opening therein substantially equal in size to the size of the central opening in said locking member but larger than the outer size of said pipe to permit said pipe to pass through said central opening in said inwardly extending portion, and a compression member having a through-bore at least equal in size to said outer size of said pipe slidably mounted in said bore adjacent said forward end and intermediate said locking and sealing members and said forward end for engagement with said other part upon securing said pipe to said other part thereby to cause said compression member to move axially rearwardly of said body as said body is forced toward said other part, said compression member axially compressing said sealing and locking members as said compression member moves axially rearwardly and the wall of said bore and said compression member having cooperating and interengaging means permitting said compression member to slide axially by an amount sufficient to compress said sealing and locking members but limiting forward axial movement of said compression member to within said bore.

2. A pipe fitting as claimed in claim 1, wherein said sealing member is a peripherally continuous sealing ring, said locking member is a locking ring, said compression member is a compression ring and said sealing ring is intermediate said compression ring and said locking ring.

3. A pipe fitting as claimed in claim 2 further comprising a further ring intermediate said sealing ring and said locking ring and engageable with both said sealing ring and said locking ring.

4. A pipe fitting as claimed in claim 1, wherein said co-operating means comprises a projection on the periphery of said compression member and said body has an inner, peripherally extending groove in the wall of said bore in which said projection is received, the axial length of said groove being greater than the axial length of said projection.

5. A pipe fittings as claimed in claim 4, wherein said projection is a ring mounted on said compression member, said compression member having a peripheral groove in which said last-mentioned ring is received.

6. A pipe fitting as claimed in claim 1, wherein said co-operating means comprises an inwardly extending shoulder on the interior of said body at said forward end thereof and a projection of triangular cross-section on the periphery of said compression member, the diameter of said projection being greater than the inner diameter of said shoulder and the diameter of said bore being at least equal to the diameter of said projection for an axial distance from said shoulder toward said rearward end which is greater than the axial length of said projection, said compression member including said projection being made of a plastics material having a compressibility permitting the insertion of said compression member into said bore from said forward end of said body.

7. A pipe fitting as claimed in claim 1, wherein said compression member is made of a plastics material and has an outer size greater than the inner size of the portion of said bore adjacent thereto whereby said compression member is maintained within said bore by frictional engagement of the periphery of said compression member with the wall of said bore.

8. A fitting as claimed in claim 1 for assembling the end of a pipe to a fluid-conveying pipe element of larger diameter in which said compression ring, which is located in line with said cylindrical body, comprises inwardly facing hooks forming a clamp and after said clamp has been hooked to a peripheral shoulder of said cylindrical body, said ring is integral with said body and it defines with said latter an annular space in which said seal and said locking piece are maintained fixed.