Roll grooved pipe
AssigneeVictaulic Company of America
InventorsRobert Rung, Douglas R. Dole
Life of this patent
Estimating the term…
Abstract
A roll grooved pipe is provided on its inner surface with a hydrofoil surface providing a transition between the inner surface of the pipe and the radially innermost portion of a radially inwardly extending step formed in the inner wall of the pipe by the cold rolling of the groove in the pipe.
Claims7
Roll grooved pipe having an outer surface, an inner surface, and a cold rolled groove formed in said outer surface, said pipe having a configuration, when viewed in longitudinal cross-section, comprised by:
- a radially extending end wall of said pipe;
- outer and inner wall portions extending from said end wall and terminating at said rolled groove;
- said rolled groove having a profile which includes a first outer radially extending wall portion terminating at said outer wall portion and extending radially inwardly of said pipe;
- an axially extending wall portion terminating at an inner periphery of said radially extending wall portion;
- and, a second radially extending wall terminating at said axially extending wall and having a height less than that of said first radially extending wall;
- an outer frusto-conical wall portion terminating at said second radially extending wall portion, and extending axially of said pipe in divergent relationship relative to a central axis of said pipe;
- said inner wall having a profile that includes an inner radially inwardly extending wall portion terminating at said inner wall portion;
- an axially extending inner wall portion terminating at an inner periphery of said radially inwardly extending wall portion and extending axially of said pipe;
- and,
- a straight sided frusto-conical wall portion commencing at said axially extending inner wall portion and extending axially of said pipe in divergent relationship relative to said central axis of said pipe to a termination of said straight sided frusto-conical wall portion at said inner surface of said pipe;
- said inner frusto-conical wall portion providing a smooth and uninterrupted linear transition between said inner surface of said pipe and said inner axially extending wall portion of said groove.
Roll grooved pipe having an internal radially inwardly extending step formed on an inner surface of said pipe, further including a frusto-conical surface portion on said pipe inner surface providing a transitional hydrofoil surface interconnecting the inner axial wall of said pipe and a radially innermost axially extending wall of said step.
Dependencies are inferred from the claim text.