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US 2003/0197380 A1Published application
Pipe coupling
OwnerDavid Chelchowski, Geoffrey B. Puckett +1inventors
InventorsDavid Chelchowski, Geoffrey B. Puckett, Luke Raymond
Life of this patent
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OwnerDavid Chelchowski, Geoffrey B. Puckett +1inventors
InventorsDavid Chelchowski, Geoffrey B. Puckett, Luke Raymond
Estimating the term…
A coupling assembly for plastic pipes including a nut, a body, a grip-ring, and a seal. The nut can engage the body through appropriate threads and includes a hooked projection having a sloping surface adapted to abut against and provide a force on a corresponding surface of the grip ring within the body. A pipe is inserted through the nut, grip-ring, and seal into the body. Tightening of the nut causes its sloped surface to engage and the grip ring to be forced both radially and longitudinally. Radial compression results in the grip-ring engaging the pipe whilst longitudinal forcing causes it to be forced into the body simultaneously abutting against and compressing the seal whilst dragging the pipe further into the body. The nut and the body may further have tapered surfaces that are brought together as the grip-ring is forced into the body. The physical connection between the body and the nut provides reinforcing for the nut, a feature especially useful when dealing with soft plastics. Further features include a lip on the grip-ring that provides an additional support for the grip-ring when compressed as well as an abutment shoulder on the nut preventing the grip-ring form being pulled out of the body.
A coupling for connection of a polymeric pipe, said coupling including;
A coupling as in any one of the above claims wherein said body inner surface is tapered and diverges outwardly of the body so that upon tightening of said nut as the grip-ring moves into said body a percentage of the nut first surface abuts against the body inner surface wherein said body thus reinforces said nut against any radial force.
A coupling as in any one of the above claims wherein said body includes an end adapted to engageably slide into the cavity defined by the nut body and the hooked projection.
A coupling as in any one of the above claims wherein said grip-ring includes an outer annular lip extending rearwardly from said second surface, said grip-ring adapted to abut against said body when the nut is in a non-tightened position wherein as the nut is being tightened it is compressed causing the lip to enter into said body, the outer edge of said lip adjacent the body inner surface to provide for support therefor.
A coupling as in any one of the above claims wherein the slope of the grip-ring second surface is smaller than the slope of the nut second surface and is selected so that when the nut engages the grip-ring and forces it into the body thereby compressing it, the slope of the grip-ring second surface is generally the same as the nut second surface.
A coupling as in any one of the above claims, said nut further including an annular shoulder extending radially inwardly from the edge of said nut second surface, said stop adapted to be abutted by said grip-ring when in its compressed state to thereby provide a resistive force for the grip-ring moving longitudinally out of the body.
A coupling as in any one of the above claims wherein the width of said nut second surface is greater than the width of the grip-ring second surface to thereby accommodate said grip-ring second surface sliding alongside said nut second surface as the nut is tightened whilst full surface contact between the two surfaces is maintained.
A coupling as in any one of the above claims wherein said coupling is made from acetal plastics material.
Dependencies are inferred from the claim text.