Pipe restrainer

DETAILED DESCRIPTION It is a principal object of the invention to provide a new and improved mechanism for restraining pipe against the force of internal pressure at a connection of the pipe with another pipe or other members such as a valve.
It is another object of the invention to provide pipe restraining mechanism which is useful with both plastic pipes such as PVC pipe and various forms of metal pipe.
It is another object of the invention to provide pipe restraining mechanism which is especially adapted to use with PVC pipe.
It is another object of the invention to provide PVC pipe restraining mechanism which will neither damage the pipe nor reduce the capability of the pipe to withstand internal pressure.
It is another object of the invention to provide pipe restraining mechanism which creates the necessary grooves to an restrain high pressures in PVC and ductile iron pipe while reducing the radial force required to create the grooves to absolute minimum after the groove has been cut allowing the thrust resisting engaging member or wedge to rest in a groove with little of the radial force required to originally cut the groove.
It is another object of the invention to provide a pipe restraining mechanism which lowers the stress in the housing ring or gland around the pipe while preserving the strength of the pipe wall and gland to resist axial thrust and internal pressure.
It is another object of the invention to provide pipe restraining mechanism using a pipe gripping wedge which is initially engaged with the pipe by mechanical torque action and thereafter further engaged with the pipe through wedging and additional torque action responsive to axial thrust in the pipe generated by internal fluid pressure in the pipe.
It is another object of the invention to provide pipe restraining mechanism which employs minimum static load on the pipe once the mechanism is engaged with the pipe and thereafter more tightly grips the pipe responsive to and in proportion to the hydraulic pressure in the pipe