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US 4,231,983 AGranted
Plastic pipe joint and method and assembly for making same
AssigneeJohns Manville
InventorDavid W. French
Life of this patent
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Abstract
A bell and spigot pipe joint including a bell end having a locked in sealing gasket and a thickened cross-sectional configuration is disclosed herein. A method and an assembly for making the bell end with its thickened cross-sectional configuration and with the sealing gasket locked in place are also disclosed herein.
Claims3
A method of forming the bell end of a plastic pipe, said method comprising:
- (a) heating one end section of said pipe to the state of thermal deformability;
- (b) forming from said heated end section a diametrically enlarged axial portion and a transverse end wall joining said enlarged portion with the rest of said pipe;
- (c) after forming said enlarged portion, substantially uniformly thickening its cross-sectional configuration by decreasing its length;
- (d) while thickening the cross-sectional configuration of said enlarged portion, integrally forming outwardly protruding rib means on the inner surface of said transverse end wall, said rib means being located radially inwardly from the inner surface of said enlarged portion so as to define a space therebetween;
- (e) concentrically positioning a circumferential sealing gasket within said enlarged portion and against said end wall such that an end segment of said enlarged portion extends beyond said gasket, said gasket being shaped such that portions thereof are located within said space;
- and
- (f) radially inwardly deforming said end segment whereby to lock said sealing gasket in place.
4 more elements
Dependencies are inferred from the claim text.