Patent ID: 9464744
Filing Date: 2016-10-11
CPC Classification: F16L

Claim Text:
1. A leakage-proof pipe fitting of quick connection for a Reverse Osmosis Membrane (RO) water treatment unit for a household comprises a pipe fitting, a sealing O-ring, an annular cooperative bushing collar, an adapted cylindrical elastic sleeving collet and an accessory latching clip with a cantilevered lug, wherein: said pipe fitting is unitarily extruded in one piece by plastics molding into a tubular L-shaped fitting with two coupling unions, wherein said pipe fitting includes a hollow water passage, a cylindrical retainer and a cylindrical docking receptacle, such that one coupling union encloses the cylindrical retainer therein, the cylindrical docking receptacle runs through the cylindrical retainer in communication with the hollow water passage, and an inner diameter of the cylindrical retainer is greater than an aperture of the cylindrical docking receptacle; said sealing O-ring comprises rubber and is inserted against an inner bottom wall of the cylindrical retainer in the pipe fitting such that an outer diameter of the O-ring is equivalent to or greater than an inner diameter of the cylindrical retainer in the pipe fitting, and an inner diameter of the O-ring is less than an inner diameter of the cylindrical docking receptacle in the pipe fitting; said annular cooperative bushing collar is unitarily extruded in one piece by plastics molding into a two-stair tiered hollow cylinder and is partially slidably inserted into the coupling union on the cylindrical retainer of the pipe fitting by means of a glue-bonding or high frequency melt-bonding method, wherein said annular cooperative bushing collar includes a top surface, a bottom surface, a jointing circular through-hole running through the top surface and the bottom surface, and a guiding conical flare respectively formed along each rim of the top surface and the bottom surface such that an outer diameter of a top stair rim abutting the top surface is greater than an outer diameter of a bottom stair rim abutting the bottom surface; said adapted cylindrical elastic sleeving collet is unitarily extruded in one piece by plastics molding into a hollow cylinder and is slidably inserted into the jointing circular through-hole of the annular cooperative bushing collar, wherein said adapted cylindrical elastic sleeving collet includes a peripheral gorgerin integrating a top surface and a bottom surface with a circular sliding through hole running therethrough, an annular cambered locking flange abutting the bottom surface and an elongated annular delimiting flange abutting the top surface as well as a plurality of circumferentially equivalent spaced apart longitudinal hooping slits formed along the bottom surface and extending towards the top surface, and a plurality of circumferentially equivalent spaced apart elastic gripping ribs each formed between two adjacent longitudinal hooping slits, such that an outer diameter of the peripheral gorgerin is smaller than an inner diameter of the jointing circular through-hole in the annular cooperative bushing collar, an outer diameter of the annular cambered locking flange is greater than an inner diameter of the jointing circular through-hole in the annular cooperative bushing collar, and an outer diameter of the elongated annular delimiting flange is greater than an inner diameter of the annular cambered locking flange; wherein a longitudinal thickness of the elongated annular delimiting flange extends as part of an embracing distance from the top surface of the adapted cylindrical elastic sleeving collet to the bottom surface of the cylindrical retainer in the pipe fitting for reducing a curvature of a bent water pipe/tube covered by the embracing distance so that the sealing O-ring does not suffer from uneven stress from the bent water pipe/tube; and said accessory latching clip is unitarily extruded in one piece by plastics molding into a planiform collar and includes a U-shaped nick with two prongs of appendix legs encompassing a central cut nick such that a width between the two legs of the U-shaped nick is greater than the outer diameter of the peripheral gorgerin in the cylindrical elastic sleeving collet, such that the accessory latching clip serves as a clamping means for the assembled pipe fitting.