F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 33/00 (2006.01) F16L 21/04 (2006.01)
Patent
CA 2080059
A cooperating combination of a metallic gland and a metallic grip ring is made to be effective in respect to both plastic pipe and metallic pipe used in fluid piping systems, which are primarily water and sewer piping systems, where these pipes are part of assembled restrained sealed bolted joints. The grip ring, in one embodiment, has an internal diameter surface structure having at least two well spaced major size pipe gripping circumferential teeth. In another embodiment, the grip ring, in addition to the major teeth, has several spaced minor sized pipe gripping circumferential teeth located between and beyond the major sized teeth. In reference to the embodiment having both sizes of teeth, when the installed grip ring is restraining a metallic pipe to keep it in a sealed bolted joint, only the well spaced major size pipe gripping circumferential teeth are, in part, penetrating the metallic pipe. When this installed grip ring is restraining a plastic pipe to keep it in a sealed bolted joint, both the major size pipe gripping circumferential teeth and the minor size pipe gripping circumferential teeth are penetrating the plastic pipe. The metallic grip ring has a radial open through slot to accommodate the subsequent reduction of the internal diameter thereof when the grip ring is in place. In respect to plastic pipe, when the radial open through slot is closed, the gasket hag been sealed, all the pipe gripping circumferential teeth, both major size and minor size, are penetrating the plastic pipe, which is not over-stressed and which will remain in the sealed bolted joint. The major size teeth are well spaced and fewer in number so they will successfully penetrate metallic pipe, which takes a lot of concentrated force, which is created when the fasteners of the bolted joint are tightened. The minor size teeth, which are closer together, are needed to provide more tooth contact area to spread out the restraining forces needed to hold the relatively weaker plastic pipes within their respective restrained sealed bolted joints. In respect to restraining metallic pipe, if minor size teeth are on the metallic grip ring, they always remain clear of the metallic pipe.
Denison George F.
Dent Larry G.
Denison George F.
Dent Larry G.
Ridout & Maybee Llp
Romac Industries Inc.
LandOfFree
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