| 摘要 |
A COUPLING ASSEMBLY (10) FOR PLASTIC PIPES (12) INCLUDING A NUT (14), A BODY (20), A GRIP-RING (16) AND A SEAL (18). THE NUT (14) CAN ENGAGE THE BODY (20) THROUGH APPROPRIATE THREADS (28) AND INCLUDES A HOOKED PROJECTION (36) HAVING SLOPING SURFACE (46) ADAPTED TO ABUT AGAINST AND PROVIDE FORCE ON A CORRESPONDING SURFACE (48) OF THE GRIP-RING (16) WITHIN THE BODY (20) . A PIPE (12) IS INSERTED THROUGH THE NUT (14), GRIP-RING (16) AND SEAL (18) INTO THE BODY (20). TIGHTENING OF THE NUT (14) CAUSES ITS SLOPED SURFACE (46) TO ENGAGE AND THE GRIP-RING (16) TO BE FORCED BOTH RADIALLY AND LONGITUDINALLY. RADIAL COMPRESSION RESULTS IN THE GRIP-RING (16) ENGAGING THE PIPE (12) WHILST LONGITUDINAL FORCE CAUSES IT TO BE FORCED INTO THE BODY (20) SIMULTANEOUSLY ABUTTING AGAINST AND COMPRESSING THE SEAL (18) WHILST DRAGGING THE PIPE (12) FURTHER INTO BODY (20). THE NUT (14) AND THE BODY (20) MAY FURTHER HAVE TAPERED SURFACES (46) THAT ARE BROUGHT TOGETHER AS GRIP-RING (16) IS FORCED INTO THE BODY (20). THE PHYSICAL CONNECTION BETWEEN THE BODY (20) AND THE NUT (14) PROVIDES REINFORCING FOR THE NUT (14), A FEATURE ESPECIALLY USEFUL WHEN DEALING WITH SOFT PLASTICS. FURTHER FEATURES INCLUDE A LIP (70) ON THE GRIP-RING (16) THAT PROVIDES ADDITIONAL SUPPORT FOR THE GRIP-RING (16) WHEN COMPRESSED AS WELL AS AN ABUTMENT SHOULDER (56) ON THE NUT (14) PREVENTING THE GRIP-RING (16) FROM BEING PULLED OUT OF THE BODY (20). [FIG. 1]
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